1978 STEREO FM TUNER BUYING DIRTORY 't"
WORLD'S LARGEST- SELLIVG ELECTRONICS IvIAOAZINE ".: JÁNUARY4978/$.1
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A `raundúp of latest micro- processor-based video and ronvideo electronnc games sweeping the'nation. s.. 0 TESTED THIS ISSUE: "' ti_ 'A,rAPIe -. is411 jr Yamaha Model 2020 - 8 AM/Stereo` FM- Receiver
y , Rr ¡ Ñ Optonica Model- RT-3535.
I I ly'~ Stereo Cassette Deck
o dbx Model 128 Dynamic Range Enhancer E.F Johnson. Viking 4360 CB
C Mobile Transceiver 9etailers: Notice of display -allowance plan AM is within last three pages. c _ AmericanRadioHistory.Com The Cobra 50XLR CB has 'it a_l. Instnllatión Kit ma-{es them the AM/FM Stereo. Cassétte: And easiest in -dash racios to install. And
CB. M drip compact unit. All s óúr Nationwide network of Author- engineered to bring you the same ized Service Centers makes them loud and clear sound Cobra is theeasiest to service. famous for. .. _ There are four Cobra in -dash The remote mike houses the` models -to choose from including channel selector, squelch control, AM/FM-/Stereo/8-track/CB: But no and channel,: indicator.. So all you matter which you choose you can need for talking CB is right there in be sure of getting the best sounding your hand. The cassette player, fea- radio going. The ultimate car radio. tures through the dial loading and, The Cobra. four-way fader control. - Because they're only five inches deep, there's- a Cobra in-dash radio ocd>bra to fit a_most any car with little or no Punches through loud and clear. modification to the Phis Cobra Communications Products dash. This DYNASCAN CORPORATION feature, plus the step-by-step 6460 W. Cortland St., Chicago, Illinois 60635 Write for color brochure EXPORTERS: Empire Plainview, N.Y CANADA: Atlas Electronics Toronto Installation Manual and Ur ivérsá_ Subject to FCC type acceptance.
CIRCLE NO. 50 ON FREE INFORMATION CARD e 1 I.
OFF/VOL -- TONE MONVANL LO CB FM BALANCE {Jr TUNINGRt .e....1 rxo. 11 S 'I OFF C]X OTAPE / NO WC 4 97FyL1ttuu;-; p92 96 1 104 ¡Q B MMI 3 `gbre. °IHMW Y_7-_=.. 12 14 . .60XLA
AmericanRadioHistory.Com Just read your blood pressure on the large easy -to -read meter of the Astropulse 10.
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-ssu 411 uter A new space-age measuring system lets you easily check your blood pressure quickly and accurately without a stethoscope.
The new Astropulse 10 lets you quickly SOLIDLY BACKED service-by -mail center is as close as your mail- read your blood pressure without a stetho- The Astropulse is powered by a readily - box. JS&A is a substantial company selling scope and without even rolling up your sleeve. available 9 -volt battery supplied with each advanced space-age products directly to The system is based on three micro -elec- unit. The Astropulse uses solid-state electron- consumers for over a decade-further assurance your modest investment is well protected. tronic circuits and a microphone transducer. ics so service should never be required. But if that The microphone picks up pulses in your service is ever required, JS&A's prompt To order your Astropulse 10, simply send artery, and the integrated circuits measure the your check for $69.95 plus $2.50 for postage pulses and relay this information to a meter and handling (Illinois residents add 5% sales which visually displays your two blood pres- tax) to the address shown below, or credit sure readings. There is no expensive stetho- card buyers may call our toll -free number scope required, no guesswork or complicated below. By return mail, you'll receive your steps to follow. Astropulse 10 complete with a 90 -day limited warranty, carrying case and blood pressure EASY TO USE record book. Taking your own blood pressure is quite TEST IT YOURSELF simple. Just stick your hand through a self - tightening velcro cuff, slide the cuff up your When you receive your monitor, see how arm, pull the tab and attach the tab to the easy it is to slip the cuff on your arm, tighten velcro material. The tab will stick automa- and inflate. See how easy it is to read. If for tically without loosening. Then squeeze the any reason you are not absolutely pleased rubber bulb to inflate the cuff, and take your with your unit, return it within 30 days for a blood pressure readings. full refund, including your $2.50 postage and handling. There is no risk. When a doctor reads your blood pressure, The Astropulse 10 was designed to take your he uses his skill and a stethoscope to recog- own blood pressure in the privacy of your Space-age technology has made it easy to nize your systolic and diastolic readings. Now home. The cuff is easily tightened with the know your own blood pressure. Order an a computer can do this in the convenience of self-tightening bar and the velcro material. Astropulse 10 at no obligation today. your home and on a regular basis. Just pull the flap and attach it to the cuff. The Astropulse 10 also flashes an LED signal and an audible tone at the two blood pressure readings to assist the hard -of -hearing \+ or those with poor eyesight. DOCTORS ENCOURAGE USE Knowing your correct blood pressure is very important. Statistics show that as many r t as 25 million Americans suffer from hyperten- sion, yet only half know about it. Hyperten- sion results in high blood pressure, and high blood pressure usually goes unnoticed until NATIONAL other symptoms of hypertension occur-often SALES too late to correct. The Astropulse 10 is so easy to use that it GROUP Dept. PE One JS&A Plaza The in encourages regular blood pressure monitoring entire blood pressure kit fits nicely the Northbrook, III. 60062 1312) 564-9000 -exactly what doctors recommend. Even if carrying case supplied free with each unit. CALL TOLL -FREE.... 800 323-6400 case and your health has been perfect, hypertension The carrying measures 3%'x 4'x 7" In Illinois call (312) 498-6900 and blood pressure can occur at anytime. the entire system weighs only 20 ounces. ©JS&A Group. Inc .1977
JANUARY 1978 CIRCLE N0. 51 ON FREE INFORMATION CARD 1
AmericanRadioHistory.Com ANALOG DELAY
EAS-A SYNTHESIZER SWTr! AMBIENCE
... t.. rIw o
l INTRODUCING... TWO-CHANNEL ANALOG DELAY UNIT FOR AMBIENCE SYNTHESIS AND DELAY EFFECTS
FEATURES 2 dimensional. Without the mixture of di- mance and yet still serve to create rect and delayed sounds that a large hall strikingly realistic spaciousness in your *TWO INDEPENDENT CHANNELS provides, almost all music reproduced in listening room. If you don't have 2 extra * 3072 STAGES OF DELAY PER the home ís lifeless. Quadraphonics has power amp channels on hand, we offer CHANNEL not proved to be the solution to this several low cost, low power amps in kit problem. The recent developement of form that would ideal * ADJUSTABLE INPUT AND OUTPUT be for this pur- bucket -brigade semiconductor techno- pose. LEVELS WITH INPUT OVERLOAD logy has made it possible to offer a rea- INDICATION Although the 2AS-A has been de- sonably priced delay unit that can trans- signed for use in music reproduction * INTERNAL OR EXTERNAL VOLT- form your listening room into a con- systems as an ambience synthesizer, its AGE CONTROLLED DELAY TIME cert hall. Using your present stereo voltage controlled clock and mixing capa- * COMPANDOR IN EACH CHANNEL system, the 2AS-A, and whatever you bilities allow it to be configured in a have in the way of 2 additional speakers number of ways for delay *3 MODES/CHANNEL WITH ADJUST- effects such as and 2 channels of power amplification- phasing, ABLE MIX flaging, chorous, and vibrato. Ex- you have all the parts to put together an ternal voltage control for special effects * CONVENTIONAL REVERB OUTPUT ambience system that is capable of creat- must be user supplied. FOR MUSIC EFFECTS ing the kind of 'space' you enjoy music The 2AS-A is sold in kit form only If you haven't heard what analog in. You don't need state-of-the-art corn - and includes the circuit boards, com- delay can do for home music reproduc- ponentry to enjoy an ambience system. ponents, chassis (11Y2" x 10" x 4"), tion, you're missing something. Let's face The secondary power amplifiers and cover 120VAC power supply, assembly it, stereo in your living room is flat and speakers can be of very modest perfor- instructions and application notes.
r MAIL THIS COUPON TODAY 2AS-A Analog Delay Unit $250.00 ppd. Cont. U.S. Enclosed is $ or BAC #
or Master Charge # Bank # Expire Date
NAME WTSouthwest Technical ADDRESS Products Corp. 219 W. Rhapsody, San Antonio, Texas 78216 CITY STATE ZIP SOUTHWEST TECHNICAL PRODUCTS CORPORATION London: Southwest Technical Products Co., Ltd. Box 32040, San Antonio, Texas 78284 Tokyo:Southwest Technical Products Corp./Japan 2 CIRCLE NO. 46 ON FREE INFORMATION CARD POPULAR ELECTRONICS
AmericanRadioHistory.Com JANUARY 1978 Popular Electronics® C, WORLD'S LARGEST -SELLING ELECTRONICS MAGAZINE VOLUME 13, NUMBER 1
Feature Articles Coming 24 LOUDNESS CONTROL-BOON OR BANE? /Julian Hirsch Next 33 NEW 1978 ELECTRONIC GAMES / Kris Jensen Video and nonvideo games for the public's recreation. Month 49 THE SPECTRUM ANALYZEP IN HI-FI MEASUREMENTS / Julian Hirsch 1978 STEREO FM TUNER BUYING DIRECTORY / Ivan Berger BUILD A LOW-COST - 54 today's FM tuners. EPROM PROGRAMMER Specifications and features of 58 HOW FM TUNERS WORK! PART 2 I Julian Hirsch NO CAMERA / NO CHEMICAL The detector and modulation / demodulation circuits. PRINTED-CIRCUIT BOARDS MODERN TURNTABLE DESIGN Construction Articles TEST REPORTS 45 BUILD "CHARGE / Ronald W. Reese ' Garrard GT-25 Turntable A digital electronic bugle with amplifier for auto or home use. Sherwood Micro CPU / 100 60 USING EXISTING HOUSE WIRING FOR COMPUTER FM Tuner Stereo REMOTE CONTROL, PART 2 / Dan Sokol, Gary Muhonen, and Joel Miller Ten-Tec Century / 21 Details on the remote circuits. CW Transceiver Columns Electronic games on the cover Fairchild's Video include: 16 STEREO SCENE / Ralph Hodges Entertainment System The Direct-to -Disc Revolution (?) (upper left); Mattel ElectronicsTM Football (upper right); and 64 SOLID STATE / Lou Garner I the Future. . . . " Parker Bros. Code Name: SectorTM. "For Dipt Into 67 EXPERIMENTER'S CORNER l' Forrest M. Mims Read / Write Memories (RAM's), Part 2. 69 HOBBY SCENE 0 & A /John McVeigh POPULAR ELECTRONICS January 1978, Vol- ume 13, Number 1, Published monthly at One Park 77 COMPUTER BITS / Hal Chamberlain Avenue, New York, NY 10016. One year subscrip- Bus tion rate for U.S. and Possessions,S12.00; Cana- Systems. da, $15.00; all other countries, $17.00 (cash or- / Gary Garcia, K0I4178 ders only, payable in U.S. currency). Second Class 80 CB SCENE postage paid at New York, NY and at additional Automatic Transmitter Identification. mailing offices. Authorized as second class mail by the Post Office Department, Ottawa, Canada, and for payment of postage in cash. POPULAR ELECTRONICS including ELECTRON- ICS WORLD, Trade Mark Registered. Indexed in the Reader's Guide to Periodical Literature. - Julian Hirsch Audio Reports COPYRIGHT o 1977 BY ZIFF-DAVIS PUBLISH- ING COMPANY. ALL RIGHTS RESERVED. Ziff -Davis also publishes Boating, Car and Driv- YAMAHA MODEL CR -2020 AM / STEREO FM RECEIVER er, Cycle, Flying, Modern Bride, Popular Photogra- 26 phy, Skiing and Stereo Review. OPTONICA MODEL RT-3535 STEREO CASSETTE CrCK Material in this publication may not be repro- 29 duced in ,any form -without permission. Requests dbx MODEL 128 DYNAMIC RANGE ENHANCER for permission should be directed to Jerry 31 Schneider, Rights and- Permissions, Ziff -Davis Publishing Co., One Park Ave., New York, NY 10016. Editorial correspondence: POPULAR ,ELEC- TRONICS. 1 Park Ave., New York, NY 10016. Edi- Electronic Product Test Reports torial contributions must be accompanied by`re- turn postage and will be handled with reasonable no responsi- care; however, publisher assumes E. F. JOHNSON VIKING 43601REMOTE-CONTROL bility for return or safety of manuscripts, art work, 74 or models. MOBILE AM CB TRANSCEIVER corre- Forms 3579 and all subscription MODEL DVM37 DIGITAL MULTIMETER ' spondence: POPULAR ELECTRONICS, 75 SENCORE Circulation Dept., P.O. Boo 2774, Boulder, CO 80302. Please allow at least eight weeks for change of address. Include your old ad- dress, enclosing, if possible, an address label from a recent issue. Departments Thé publisher has no, knowledge or any proprietary rights which will be violated by the making or using Of any items disclosed in this 4 EDITORIIAL / Art Salsberg issue. Electronics and the Handicapped. 6 LETTERS 12 NEW PRODUCTS Member Audd Kneel. Of C colatonr 15 NEW LITERATURE 100 OPERATION ASSIST
JANUARY 1978 3
AmericanRadioHistory.Com Popular Electronics®
JOSEPH E. MESICS Publisher ARTHUR P. SALSBERG Editorial Editorial Director
LESLIE SOLOMON Technical Editor
JOHN R. RIGGS ELECTRONICS AND THE HANDICAPPED Afariaging Editor I was startled to learn at a recent AT&T press conference that there are about IVAN BERGER 50 -million people in this country who are considered to be handicapped to some Senior Editor extent. (For example, 1 out of 4 elderly people suffer hearing -loss problems.) And I ALEXANDER W. BURAWA was impressed by the ongoing efforts of a voluntary organization of telephone- Features Editor industry workers-the Telephone Pioneers of America-who create and make EDWARD I. BUXBAUM available various electrical and electronic aids for the blind, deaf, retarded, and Art Director motion- and speech -handicapped after working hours. JOHN McVEIGH Many of these devices require some handiness with a soldering iron; a few de- Associate Editor mand kit -building experience. For instarce, one "Pioneers" chapter supplies an ANDRE DUZANT "Audio Aid" device to enable needy persons who are hard -of -hearing to boost the Technical Illustrator sound level of a TV receiver, motion -picture, etc., so that it can be heard better. (A CLAUDIA TAFARO converted portable radio's speaker acts as a microphone in this case, and the am- Product ion Editor plified sound is heard through an ear- phone.) Complete plans are DORIS A. MATTHEWS available Editorial Assistant for converting a G.E. Model P2790 or Model 7-2705 portable radio for this pur- Contributing Editors Hal Chamberlin, Lou Garner, Glenn Hauser pose from Telephone Pioneers of Amer- Julian Hirsch, Ralph Hodges, Forrest Mims ica, Bell Telephone Laboratories, Room Ray Newhall, Wilfred Scherer 6H-416, Murray Hill, NJ 07974. Any ra- JOSEPH E. HALLORAN dio with an earphone jack can be simi- Advertising Director larly modified, though some parts substi- JOHN J. CORTON tutions may be required. A pc foil pattern Advertising Sales (1" x 7/16") is included in the plans, as well a LINDA BLUM ;I as point-to-point wiring diagram. Advertising Service Manager Another illustration of how Pioneers' FRANCES YERKES ingenuity and dedication have made Executive Assistant life more pleasurable for handicapped EDGAR W. HOPPER people is the development of a "beep- Publishing Director ing" softball. Here, a telephone engineer buried an amplifier and electronic beep - ZIFF-DAVIS PUBLISHING COMPANY Editorial and Executive Offices Putting the "beep" in the baseball. er inside a ball so that blind children can One Park Avenue New York, New York 10016 play baseball. In 1973, the Audio Ball was 212-725-3500 placed in National Baseball in Hershel B. Sarbin, President the Hall of Fame Cooperstown.Today, local Pioneer Philip Korsant, Executive Vice.President chapters have devised other'beeping"sports aids for the blind:an audio basketball Furman Hebb, Executive Vice President laced with bells that's played against a backboard wired for sound; an audible John R. Emery, Sr. Vice President. Finance and Treasurer Phillip T Heffernan, Sr. Vice President hockey puck; a beeping horseshoe game; a beeping golf putting device; an audio Edward D. Muhlfeld, Sr. Vice President, Sports Division ring -toss game, and so on. Philip Sine, Sr. Vice President For retarded and Frank Pomerantz. Vice President, Creative Services autistic children who can't relate to adults, Telephone Pioneers Arthur W. Bulzow. Vice President, Production developed, make and donate talking dolls and toy animals. The toys are equipped Lawrence Sporn, Vice President, Circulation with two-way radios so that a therapist can remain out of sight and talk through the George Morrissey, Vice President Sydney H. Rogers. Vice President toy to young patients, who frequently respond to this "person." Sidney Holtz, Vice President There are a host of other ways in which persons with electronics know-how can Albert S. Train, Vice President Paul H. Chook, Vice President aid the handicapped. For example, people confined to wheelchairs could be shown Edgar W. Hopper, Vice President how their everyday living can be enhanced through listening to shortwave radio Robert N. Bavier, Jr., Vice President broadcasts, learning Morse code, building electronic kits, etc. There Charles B. Setos. Secretary are other areas of assistance, too. For instance, one may record book and magazine articles William Ziff, Chairman on tape for distribution to the blind. A vocal interface for a computer would enable W. Bradford Briggs, Vice Chairman some handicapped people to control a variety of electric appliances, even opening Midwestern Office The Pettis Group, 4761 West Touhy Ave., and closing a door, by emitting a specific sound. The list of ways in which you can Lincolnwood, Illinois 60646, 312 679-1100 provide help through your knowledge of electronics is virtually endless. So why not Thomas Hackney, Michael Neri, Gerald E. Wolfe set aside some time for this very worthwhile effort? Western Office 9025 Wilshire Boulevard, Beverly Hills, CA 90211 Any PE readers interested in contributing ideas or assistance to the Pioneers, or 213-273-8050;BRadshaw 2-1161 wish to receive free plans for any devices that help the handicapped, contact the Western Advertising Manager: Bud Dean Japan: James Yagi Telephone Pioneers of America at AT&T, 195 Broadway, New York, NY 10007. Oji Palace Aoyama; 6-25, Minami Aoyama 6 Chome, Minato-Ku, Tokyo 407-1930/6821. 582-2851
4 POPULAR ELECTRONICS
AmericanRadioHistory.Com Send today for the NEW WINTER '78 HEATHKIT CATALOG It The world's largest selection of fun -to -build electronic kits plus 11111 value -packed Heath -recom- .1~µi,,9llrutiFtsm.nwota p Y WhoH vvsWq. mended assembled products. tfiaw;soco and WINTER iirre 'j d ittti0vq¡a+ns. Heathkit products are world- tt ftndonyussaWmhe ' ounda.00aloa, .1 bawl cn.oRrv 'riiwa.s ao,en famous for their easy step- . ~GR ClPts.o\Mutot. \ ...° yátan n-.sWomt1lcslW\ by-step instructions, top 0;1114"Mlw*s'Muss and aR-Out a _ needa and profes- - Forp,aapsmauuttnº performance 1asEYR~10. . ' lot LheHa^a\Heath sional specifications. Thatis mom 'ihn FtáINRK sEyt lotscost COUPON BELOW \MK,ta\IatXaea\ MAIL tAaalhenit- I) unto-b u11d. k1U hNV i.m FOR YOUR FREE COPY! MNGUonIG tno,e t`mellaseason\rieln malta 71°0 yo 9,khoM1 and tam ,note
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Send for your Heathkit Mail Order HEATH Cata og today! It's filled with -large,. Heath Company, Dept. 010-370 Scilumberger Benton Harbor, Michigan 49022 FREE clear+ illustrations and complete de- scriptions of unique products you can build and service your - self! Please send ma my FFE_ Heathkit mail order Catalog. I alt not on your mailirg list. You can get a FREE retail catalog by redeeming this coupon in person at Nam .,. -.. - any of the 50 Heathkit Electronic Centers (Units Address of Schlumberger Prod- ucts Corporation) inoomajor markets coast -to -coast, where Cit! State Heathkit products are sold, displayed, and serviced. (Retail o prices on sorne products may be slightly hitgher.) Check the Zip white pages of your telephcne books for the Heathkit Elec- CL -649 tronic Center nearest you.
CIRCLE NO. 5 ON FREE INFORMATION CARD - JANUARY 1978 5
AmericanRadioHistory.Com article "How to Program Calculators for Fun being used on our vehicles. We do this be- and Games," all of the game programs have cause we know that some highway patrolmen been translated from Hewlett-Packard "Re- running speed traps will lie to make "brownie verse Polish Notation" into Texas Instru- points." -Clarence Jones, Saint George, SC. ments "algebraic" notation for the SR -56. They are available for the nominal fee of GREMLINS AT WORK $2.00 to cover printing, postage, and han- About the article in the November issue, dling-Dale G. Platteter, Suite 201, 1315 Q "How to Dress up Your Projects." The first St., Bedford, IN 47421. page was terrible. I could hardly read it. Letters RADAR DETECTORS -Damon Hill, Atlanta, GA. This is in rebuttal to your November Editori- The circuits in Figs. 2 and 3 of "Experi- al's comments about whether it was morally menter's Corner," October 1977, should be ALGEBRAIC NOTATION TRANSLATION correct to use radar detectors. My corpora- interchanged.-G. Levelius, Mansfield, OH. To your many readers who have requested tion uses them in all our vehicles; not to "out- my an "algebraic" translation of June 1977 fox" the law, but as a reminder that "radar" is COMPLIMENTS ON QUALITY Permit me to compliment POPULAR ELEC- NEW LSI TECHNOLOGY TRONICS' quality and content. Some 25 years FREQUENCY COUNTER ago, I was reading the Amateur Radio maga- zines and remember PE as a pulp magazine TAKE ADVANTAGE OF THIS NEW STATE-OF-THE-ART COUNTER FEATURING THE that appeared to be written for the average
MANY BENEFITS OF CUSTOM LSI CIRCUITRY. THIS NEW TECHNOLOGY APPROACH sixth grader. I guess those sixth graders have TO INSTRUMENTATION YIELDS ENHANCED PERFORMANCE, SMALLER PHYSICAL grown up, and PE has kept pace with the SIZE, DRASTICALLY REDUCED POWER CONSUMPTION [PORTABLE BATTERY growth, providing us with sophisticated and OPERATION IS NOW PRACTICAL], DEPENDABILITY, EASY ASSEMBLY AND fascinating articles and magnificent ads. My REVOLUTIONARY LOWER PRICING! only wish is that you would have more ads
from some of the computer stores because I
9 am so ignorant about computers that I do not know where or how to start digging out the in- formation, equipment sources, etc.-Jay M.
' !CAS .¡ Burns, Luling, LA. IpMIcs,sC: Es ®fC WANTS MORE "GUIDES" ; -[ 3' I very much enjoyed and benefitted from . ` I a u` ' "Guide to Oscilloscopes" (June 1977). am J J third -year electrical engineering student, and o , l answered many ques- FREQUENCY the article on scopes tions my college instructors never bothered to - 111Ó,SEC address. I would like to see POPULAR ELEC- . ,. LEApZERp nE 1A. to CATE I TRONICS publish similar features on power - %SEC . I supplies, r -f generators, and VOM's. I am s5 SU particularly interested in these items.- Charles B. Howard, Minneapolis, MN.
FEATURES AND SPECIFICATIONS: INTERFACING DISPLAY: 8 RED LED DIGITS .4" CHARACTER HEIGHT GATE TIMES: 1 SECOND AND 1/10 SECOND While considering the construction of a [AUTO DEC. PT. PLACEMENT] SIZE: giant digital scoreboard ("A Digital Timer - RESOLUTION: 1 HZ AT 1 SECOND, 10 HZ AT 1/10 SECOND. 13/4 LBS. 3" High FREQUENCY RANGE: 10 HZ TO 60 MHZ. (65 MHZ TYPICAL[. Scoreboard for Athletic Events," August COLOR: SENSITIVITY: 10 MV RMS TO 50 MHZ. 20 MV RMS TO 60 MHZ TYP. 6" Wide I INPUT IMPEDANCE: 1 20 1975), found a simple and very effective BLACK MEGOHM AND PF. 51/2" Deep [DIODE PROTECTED INPUT FOR OVER VOLTAGE PROTECTION.[ interfacing digital IC's to + means of directly ACCURACY: 1 PPM I+ .0001% :AFTER CALIBRATION TYPICAL. STABILITY: WITHIN 1 PPM PER HOUR AFTER WARM UP (.001% &TALI large ac displays. I used a light -activated IC PACKAGE COUNT: 8 [ALL SOCKETED] INTERNAL POWER SUPPLY: 5.2 V DC AT 800 MA. SCR optoisolator (GE's H11C1). The Ga-As ORDER BY PHONE OR MAIL REGULATED. INPUT POWER REQUIRED: 8-12 VDC OR 115 VAC AT 50/60 HZ. COD ORDERS WELCOME , LED in this device can be driven directly by POWER CONSUMPTION: 4 WATTS INPUT CONNECTOR: BNC TYPE the current that normally drives one segment
of a small LED display. I used the Intersil KIT#FC-50C 60 MHZ COUNTER WITH CABINET & P.S $119.95 7205 stopwatch IC, which has a 5 -volt, 20- KIT#PSL-650 650 MHZ PRESCALER [NOT SHOWN) 29.95 mA multiplexed output. Each segment of my MODEL #FC-50WT 60 MHZ COUNTER WIRED. TESTED & CAL. 165.95 giant display consists of four clear "nite lites" MODELHFC-50/600WT..600 MHZ COUNTER WIRED, TESTED & CAL. 199.95 wired in parallel. The display consumes
KIT NFC-50C IS COMPLETE WITH PREDRILLED CHASSIS ALL HARDWARE AND STEP-BY-STEP about 150 mA at 117 volts ac per segment, INSTRUCTIONS. WIRED & TESTED UNITS ARE CALIBRATED AND GUARANTEED. PRESCALERS which is well within the 300-mA rating of the WILL FIT INSIDE COUNTER CABINET. LASCR.-Doug Henry, Corvallis, OR. TERMS: FOR SHIPPING, HANDLING Er INSURANCE TO US Er CANADA ADD 5% ALL OTHERS 10%. . FLORIDA RES. ADD 4% SALES TAX. COD LOG CONVERTER PART NUMBER CHANGE CHARGE $1.00. 411/ BANKAMERICARO In the "1/2 -octave Real Time Audio Analyz- i,.bono" A'ri er, Part 2," in the October 1977 issue, Texas Instruments has changed the number of IC36 OPTOELECTRONICS, INC. from SN76502 to TL441 - Gil Gamesh, BOX 219. HOLLYWOOD; FLA. 33022.1305) 9212056 Babylon, N.Y.
6 CIRCLE NO. 34 ON FREE INFORMATION CARD POPULAR ELECTRONICS
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JANUARY 1978 CIRCLE NO. 14 ON FREE INFORMATION CARO 7
AmericanRadioHistory.Com Learn to service Communications/CB equipment at home...with NRI'S COMPL COM. :UNICATIONS COU SE Learn design, installation and maintenance of r commercial, amateur, or CB communications Ors A equipment. .Pw- The field of communications is bursting out all over. In Citizens Band alone, class D licenses grew from 1 to over 2.6 million in 1975, and the FCC projects about 15 million CB'ers in the U.S. by 1979. That means a lot of service and maintenance jobs ... and NRI can train you at home to fill one of those openings. NRI's ; :-.-: Complete Communications Course covers all iv types of two-way ij.f radio equipment `P (including CB), eox:4e SI AM and FM . special instruction so you can go on the air. The complete course includes 48 lessons, 9 special reference texts, and 10 training kits. . Included are: your own electronics Discovery Lab, Antenna Lab, 1I Applications CMOS Frequency '453 > t`` - t ó . Counter, and an Optical Transmission System. I ' ~- (1 ..--Ja;6 ,,' You'll learn at home, progressing at your own speed, to your FCC license and into the communications field of your choice. Transmissión and Reception, Television Broadcasting, Microwave Systems, `t NEW CB SPECIALIST Radar Principles, COURSE NOW OFFERED Marine Electronics, o 4.1" Mobile Communica- 1111li tions, and Aircraft Electronics. lE:i The course will also qualify you for Ml a First Class Radio Telephone Commercial FCC License or you get your tuition back.
Learn on your own 400-channel digitally- synthesized VHF transceiver. You will learn to service all types of communi- NRI now offers a special course in CB Servicing. You get 37 lessons, 8 reference texts, your own cation equipment, with the one unit that is Transceiver, AC power supply and multi - to train CB designed mechanically and electronically meter ... for hands-on training. Also included you for CB, Commercial and Amateur communi- are 14 coaching units to make it easy to get cations: a digitally -synthesized 400 -channel VHF your commercial radio telephone FCC license- transceiver and AC power supply. This 2 -meter enabling you to test, install, and service com- unit gives you "Power -On" training. Then we munications equipment. help you get your FCC Amateur License with
AmericanRadioHistory.Com NRI offers you five TV/Audio Servicing Courses NRI can train you at home to service TV - 6 equipment and audio systems. You can choose from 5 C------"---`.,Í courses, starting with a 48 -lesson ff5-: - basic course, up r to a Master Color TV/Audio Course, complete with
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AmericanRadioHistory.Com nounced by Takahashi and Associates. Six kits are available, each consisting of a num- ber of interchangeable module blocks carry- n o ing the symbols of the components they con- 901 tain, plus a plastic frame with battery case, mmmm® tuning capacitor meter and omm t`-1 +r antenna. The ó .. 9111Q.- = number of module blocks supplied ranges from 12 in the smallest kit to 46 in the largest, or begin playing at that point. The memory re- whose frame also includes a light-sensitive New Products wind will not only rewind to zero (or any other CdS cell, a speaker and several built-in con- Additional information on new point) and stop or begin playing, but can also products trols. Among the projects that can be assem- covered in this section is available from be programmed to stop at any given point on bled from the kits are a radio, a wireless mi- the manufacturers. Either circle the item's the tape thereafter. The tape counter is an crophone, a light control circuit, touch buzzer, code number on the Reader Service Card LCD digital display which can also be set to inside morse code tone circuit, and others. No sol- the back cover or write to the man- shdw the time a tape has been running. A ufacturer at the address given. dering is required. Address: Takahashi & As- built-in quartz digital clock allows timer - sociates, 3183-G Airway Ave, Costa Mesa, operated automatic recording or playback. CA 92626. Other features include Dolby noise reduction, dual VU meters with peak indicators, mike and line mixing, and separate bias and equal- SETTON TURNTABLE ization selector switches. $300. COMMANDER CB ANTENNA The TS -11, a turntable with several conven- CIRCLE NO. 93 ON FREE INFORMATION CARD "Magnum Ears", a ience features, has been announced by Set - twin -loaded CB mobile or ton International. Controls are arranged on apartment antenna only 13 inches high, has RAM STEREO PREAMPLIFIER been announced by the front panel for easy access, and the dust - Commander. VSWR is cover telescopes, rather than lifting, both to The RAM200 stereo preamplifier from RAM adjustable to 1.2:1 or better, according to the prevent jarring of the arm and to allow the Audio Systems, Inc, features FET inputs, , class -A output circuits, and some unusual control features. Balance is controlled by an array of 5 pushbuttons, which gives a range up to 30 dB of attenuation, in 2 -dB steps, in o . either channel. Preamplifier output level is in- ,. .y .f = I' dicated in dBm by dual LED arrays. Input and '1 output connections, including two phono cir- cuits, tuner, aux, two tape monitor circuits turntable's use on shelves with limited head- and one external processor loop, are access- i room. The two -speed turntable has an auto- ible beneath a removable panel at the top - matic return and shutoff. A light illuminates rear of the cabinet. There is an additional manufacturer. The twin.-loaded radiating ele- the stylus path as it moves across the disc, front -panel input and tape output. Other fea- ments form a centerfed dipole with a claim of for easier manual cueing. tures include direct input for moving -coil car- high efficiency. The antenna comes with a 6 - pole CIRCLE NO. 91 ON FREE INFORMATION CARD tridges, automatic muting for amplifier and magnetic base mount that measures 4" speaker protection, and atape-output inter- in diameter. $21.95. lock that prevents feedback howl. THD CIRCLE NO: 95 ON FREE INFORMATION CARD COBRA CB/RADIO COMBINATIONS and IM are reportedly each less than 0.02%, and Cobra Communications has announced two S/N is greater than 80 dB on phono inputs. 40 -channel CB/stereo FM -AM combination $1000. OHIO SCIENTIFIC COMPUTER units for in -dash mobile use. Both are only 5 CIRCLE NO. 94 ON FREE INFORMATION CARD Ohio Scientific has added the Challenger II to inches deep, with adjustable tuning shafts for its Challenger microcomputer series. The easier adaptation to most cars, and are sup- new model is a complete computer, equipped plied with 24 -page installation manuals. A MODULAR ELECTRONIC PROJECTS with CPU, optional 8k BASIC in ROM, a 256k built-in monitor circuit automatically cuts off A modular system of snap -in components sound from the AM/FM radio section when that can be used to assemble a variety of calls are received on any pre -selected CB educational electronic projects has been an- channel. CB sections feature DynaMike gain EX-15 control and an r-f/S meter. The Cobra [email protected] 47XLR, with remote -control digital -readout microphone, pushbutton AM -FM tuning and ',ay' EX-7:30 PA output provision is $299.95. The 46XLR, EX- ®' - 100 =--r .''''.....1...--L'...... E,X-60 :-..`-L .. without those three features, is It -. t a - $259.95. in- . cludes front -panel LED channel readout. --- , -_ o¡, '''-,i15- ' RyTJ CIRCLE NO. 92 ON FREE INFORMATION CARD : : 9 . ./ y,r r s¡^ Memory Management ROM, a 4k RAM and a ii --`1'114,1 7773.-1' ' ?',":',. .--IL Is SHARP CASSETTE DECK --- .serial port. The system can be operated at clock rates of 1 MHz or 2 MHz. It's available Microprocessor control is used to add a °' 1 several in two video -based models, the IIV and IIP. unique functions to Sharp's new RT-3388 .t CIRCLE NO. 96 ON FREE INFORMATION CARD cassette deck. The Auto Program Locate De- ;;x'-s»=- .T` .,,,* vice (APLD), which searches ahead to the -',,:^ -4-A next blank space between selections on ex- -.,.-46...~...5 B.I.C. INDOOR FM ANTENNA isting Sharp decks, can be programmed on The "Beam Box," an electronically directable this one to jump ahead to the 2nd, 3rd, or FM antenna styled to resemble other stereo even 19th such blank and EX-120 space, either stop components, has been announced by B.I.C. 12 POPULAR ELECTRONICS
AmericanRadioHistory.Com R. here súpériór technology makes the música
erénce:l. 2 Sansúis new DC . integrated mplifierrand,máiching- tuner.
level) guarantees volume precision. Sansui is proud to introduce the new AU -717 DC . , a1'tenuator control fea-ures IIF band- integrated amplifier aad matching TU -717 tuner, designed The matching TU -717 tuner dual mono, - for your greatest listeniirg pleasure. We are proud of the width to let you select for lowest distortion (0.07% or maximum selectivity 180dB), SJN is su rlative specrfications that our sophisticated research - 0.07% stereo). ha achieved. The finest available at any proe. excellent: 80dB mono, 77dB stereo. styled, But the best specs alone' don't always mean the finest In addition, the AUTU 717's are elegantly and are most a"tractively m&)sic reproduction. And so we are proud tha bur precision offer crack mounting adaptors 5320' engineering anc superior circu,try design create pure and priced. Less than 54.50 for the AU -717 and_ess than bri liantly clean tonal quality that's distinctly superior. for the TU -717. Listen to whatwe offer: Frequency response of the Listen to these brilliant new components at your today. When you hear the new - A -.717 from main in, 0Iz to 200KHz (+0dB, -3dB), (the franchised Sansui dealer never want to setae - - wi est of any DC integrated amplifier available), gives Sansui A,U/TU-7'7's, you will again less best. - yo sharp, clear transients and greatly redt,ced phase - for than the of musical oleasúre. íi shi problems. Total harmonic distortion ís astoundingly Scnsui. A whole new world price ° low, less than 0.0425%, 'tom 10-20,000Hz. 85 watts/channel. 'Approinate natiomady advertised value. The acttraFreto.l Will be set by the individual dealer at his option.. min. RMS, both channels driven into 8 ohms. Dual independent power supplies provide truest st reo separation anc a large power reservoir. For uncol- ored phono reproduc-ion equalization is witinin -±-0.a2dB (20- 20,000Hz. extended R AA curve). And the calbrated- r--
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Get alld the newest and latest information on the new McIntosh Sol- id State equipment in the McIntosh catalog. In addition you will receive an FM station directory that covers all of North America.
... it IN 81.111 IR Ill .. t =-:.-,--,...s.-- .. u : 1:7 R il D 11 OE lg 81 The antenna, which requires no batteries or M S. ME 1.3 ..,.r. Z./1bt.. f...x,,,t ' power, has a bi-directional pickup pattern which can be oriented into any of four pairs of quadrants at 45° intervals, to reduce mul- tipath interference. Switch -selected, broad and narrow bandwidth settings are available MX 113 and the antenna may be tuned, in the narrow - FM/FM STEREO AM TUNER AND PREAMPLIFIER band position, to be less selective to unwant- ed signals. Bandwidth at the narrow setting is McIntosh Laboratory, Inc. 3 MHz at -3 -dB points. At approximately 4 East Side Station P.O. Box 96 MHz from the tuned frequency, response is Binghamton, N.Y. 13904 claimed down 10 to 12 dB. Gain is said to be Dept. PE -5 dB in narrowband position, -12 dB in wideband, referenced to a standard dipole. NAME $89.95.
ADDRESS CIRCLE NO. 97 ON FREE INFORMATION CARO CITY STATE ZIP
If you are in a hurry for your catalog please send the coupon to McIntosh. AP PRODUCTS BREADBOARDS For non rush service send the Reader Service Card to the magazine. The Unicard series of reusable, solderless CIRCLE NO. 27 ON FREE INFORMATION CARO breadboard module cards from AP products has been revised. Like the previous Uni- cards, the new models include matrix bread- HOBBYISTS! ENGINEERS! TECHNICIANS! STUDENTS! boarding sockets on bus -wired circuit boards designed to plug into standard 5t/á' card Write and run machine language programs at home, display video graphics racks. They also have extractor handles for on your TV set and design microprocessor circuits - the very first night easy withdrawal and rubber feet for protec- - even if you've never used a computer before! tion during bench work. The new Unicards' SPECIFICATIONS matrix sockets now have rows of 5 tie -points ELF II features an RCA RCA COSMAC microprocessor/mini- (vs. the previous models' 4), giving the new COSMAC COS/MOS 8 -bit Unicard I a total of 960 tie -points (192 rows of microprocessor address- , mm,e computer able to 64k bytes with 5) and 1620 (324x5) for the new version of DMA, interrupt, 16 regis- A:THOUGHTFUL GIFT ters. ALU. 256 byte RAM, FOR ANYONE WHO MUST the Unicard II. Prices start at $31.50 for the full hex keyboard, two ° STAY UP TO DATE IN' Unicard I.
digit hex output display, COMPUTERS AND . 5 slot plug-in expansion ELECTRONICS' . CIRCLE NO. 98 ON FREE INFORMATION GIRD bus, stable crystal clock `-}.Y.,i for timing purposes and a S7'Gf'S double -sided plated - . through PC board plus Dl RCA 1861 video IC to dis- ELF" $gg95 BOSE SPEAKER SYSTEM play any segment of mem- SEND TODAY Ma MUM 2~ZIM ory on a video monitor or A new Bose Direct/Reflecting speaker sys- TV screen. U NETRONICS R&D LTD., Dept. PE -1 333 Litchfield Road, New Milford, CT 06776 Phone (203) 354-9375 tem, Model 601, features four 3" tweeters and USE ELF II FOR ... Yes! I want to ran programs at controllers, etc. (soon to be two 8" woofers, all radiating in different direc- GAMES home and have enclosed: available as kits). Manual in - D $99.95 plus $3 p&h for RCA eludes instructions for assembly, tions through the top and front of the ported Play interactive keyboard games, COSMAC ELF kit. Featured testing, programming, video games with analog inputs, games II in POPULAR ELECTRONICS. graphics and games plus how enclosure. System impedance is 8 ohms; utilizing your TV set for a video Includes display! all components plus you can get ELF II User's Club everything you need to write bulletins. Kit can be assembled GRAPHICS and run machine language pro- in a single evening and you'll Create pictures, designs, alpha-, grams plus the new Pixie chip still have time to run programs, numerics and fabulous animated that lets you display video including games, video graphics, effects on your TV screen for graphics on your TV screen. De- controllers, etc. before going to hour after hour of family fun! signed to give engineers practice bed! $4.95 for 1.5 amp 6.3 CIRCUIT DESIGN in computer programming and VAC power supply, required for Design circuits using a micro- microprocessor circuit design, ELF II kit. $5.00 for RCA processor. Use ELF II as a ELF II is also perfect for college 1802 User's Manual. counter, alarm system, lock, and college -bound students (who I want mine wired and tested controller, thermostat, timer, must understand computers for with the power transformer and telephone dialer, etc. The pos- any engineering, scientific or RCA 1802 User's Manual for sibilities are infinite! business career). Easy instruc- $149.95 plus $3 p&h. Coming Soon! tions get you started right away, Conn. res. add sales tax. Exclusive Netronics Plug -In even if you've never used a com- Program Debugger and monitor puter before! NAME As your need for computing allows visual display of any ADDRESS program on a clock pulse by power grows, five card expan- clock pulse basis to help you sion bus (less connectors) allows CITY learn programming fastt 4k memory expansion, program de- memory Cassette I/O D to bugger/monitor, cassette I/O, A STATE JIP Send info kits! A, A to D Controller plug -Ins. to D and D to A converters, on other ` PROM, A CII keyboard inputs, Dealer Inquiries Invited Available now J 14 CIRCLE NO. 28 ON FREE INFORMATION CARD POPULAR ELECTRONICS
AmericanRadioHistory.Com crossover frequency, 2 kHz. Minimum am- stalled for best protection, explains how the plifier power required is 15 watts rms per sensors and "panic buttons" are connected channel or more. A major portion of the to the control unit, tells how the alarm reports sound energy is directed upward, both direct- intrusions, and offers tips on cost, quality, ly to the listener and indirectly via the wall and performance. Address: Home Security above and behind the speaker, to position the Alarms, Dept. 676E, Consumer Information sound above the level of sound -absorbing Center, Pueblo, CO 81009. furniture and simplify speaker placement. A 2 -position "symmetry control," which alters the speaker's directional characteristics by New Literature ORA REPLACEMENT CATALOG varying the signal level to the various drivers, Eight -page catalog contains original Japa- is also provided '.s an aid to easier place- nese replacement parts for the service of CB CB ANTENNA TUNER BROCHURE ment. The 601 is supplied in mirror-image radio, TV, hi-fi equipment, etc. It features in- pairs. Dimensions are 25.5"H x 15'W x "The Ultimate in Antenna Tuning Systems," a tegrated circuits, transistors, ceramic filters, 13"D (66 x 39x 33 cm). new four -page brochure that describes new tape and cassette heads, plus more. Ad- "isolated circuit" antenna tuners for mobile CIRCLE NO. 99 ON FREE INFORMATION CARD dress: Ora Electronics, Box 7548, Van Nuys, and base stations for CB operation is avail- CA 91409. PANASONIC CAR CASSETTE PLAYER able from Norcom Electronics Inc. The bro- The Model CX-7100 cassette player is one of chure illustrates and describes the compa- a new line of car audio components intro- ny's "Iso-Tune," "Back Talk," and "Ultra - HEATH INSTRUMENTS CATALOG duced by Panasonic. The CX-7100 has an Tune" antenna tuners, all of which are said to A 32 -page Heath/Schlumberger catalog lists auto reverse mechanism for continuous play, tune antenna systems to optimum SWR their complete line of test instruments and a two -stage preamp and dual -channel am- across all 40 channels. Address: Norcom new products. These include three new fre- Inc., 23611 Blvd., Beach- plifier. Output power is 4.5 watts per channel Electronics Chagrin quency counters with ranges up to 1 GHz, a at 400 Hz with 10% THD into a 4 -ohm load. wood, OH 44122. FET multimeter, a lin/log swept -function gen- Other features include one -lever operation erator, and a low-cost voltage -controlled for last forward/rewind/eject, lockable fast NBS HOME SECURITY ALARM PAMPHLET function generator. Other instruments includ- forward and rewind, and automatic and man- Descriptions of the different home security ed are oscilloscopes, chart recorders, VOM's ual program selector, and a direction indica- alarm systems and their operation are high- and VTM's, power supplies, distortion analyz- tor lamp. Dimensions are 7 4/5'W x 2 12/ lighted in "Home Security Alarms: What They ers, color TV service equipment, learn -at- 25"H x 5 3/10"D (190 x 64 x 135 mm) and Are and How They Work" from the National home electronics courses, and more. Ac - weight is 3.3 lb (1.5 kg). Price $99.95. Bureau of Standards. The pamphlet suggests dress: Heath/Schlumberger Instruments,
CIRCLE NO. 100 ON FREE INFORMATION CARD where each type of system should be in- Dept. 570-010, Benton Harbor, MI 49022.
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AmericanRadioHistory.Com suitable high -sensitivity preamplifier that lacks RIAA equalization. Therefore, our intention was to cut a square wave with the full RIAA recording preemphasis, so that it would play back flat on the aver- Stereo Scene age audiophile's phono system. This makes a world of difference and of dif- ficulty in the cutting studio. By Ralph Hodges The Agony of Defeat. The sorry fact is that the best of modern disc -recording THE DIRECT -TO -DISC REVOLUTION(?) equipment cannot cut a clean 1 -kHz RIAA square wave. At least it .couldn't the way we were going about it, with a modified Wavetek function generator NOT LONG AGO, I got my first made with a square -wave test record having a rise time almost faster than chance to participate in a direct -to - from CBS. If the cartridge is reasonably light. We used in succession the current disc recording session. It was not what good, the photos can look pretty decent Ortofon and Neumann cutters, generally you'd call a major production. Only one in terms of waveform and visible reso- considered to represent the state of the performer, a function generator, was in- nances; and if a cartridge can make the art, with about an equal lack of success. volved, and the object was to put about waveform look good, we can generally Even some of the cutters' electronics a minute or so of a 1 -kHz square wave assume that the recording itself is good, were found not up to the task, so that we on lacquer (i.e., the lacquer -coated alu- right? A fair assumption. However, CBS had to bypass them and run straight into minum disc on which a master disc re- has cut that square wave without RIAA the lathes' power amplifiers. Still not cording is cut). equalization, so that, with a magnetic good enough! A cutting -stylus assembly You probably have noticed oscillo- phono cartridge, the recording must be is a comparatively massy, inertia - scope photos of 1 -kHz square waves in played back with a "flat" phono pream- plagued structure which, when stimulat- phono-cartridge test reports, usually plifier. Most consumers don't have a ed in this brutal way, is just bound to ring. We could see the ringing under the microscope and we could see it when we played the test cuts, indicating that -in this respect at least-the playback phono cartridge was actually better than the cutting instrument. Finally we fudged and cut a 500 -Hz square wave instead (which, because we were doing half -speed cutting, was actually 250 Hz as far as the cutter head was concerned). This turned out to be much easier.
Direct -Cutting Philosophy. I began this column by saying that this was a di- rect -to -disc recording session, and it certainly was for a minute or two. How- ever, almost all the rest of the many cuts we were putting onto our test record were derived from a master tape, and you may be justified in wondering why the square -wave test couldn't come from the master tape as well. The rea- son is that, as bad as a cutter head seems to be at handling a square wave, thé typical tape machine is' about a hun- dred times worse. Although tape record- ing involves no mechanical inertia (ac- cording to Barkhausen, there is definite- ly a sort of magnetic "inertia" involved, however), it does involve oodles of phase shift. Sony offers a phase -cor- rected machine (Model TC-880-2) that can reproduce a nicely recognizable 16 POPULAR ELECTRONICS
AmericanRadioHistory.Com , .
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.rCSC's done it agar. Erators.0 ecking computer clocks Specifications. . 1 M Ha, guaranteed. ' , Barge: 20 Hz b C0 B-oken the pr ce and perfor- . and otherdig tl circuits. Repair of nance barriers w:brew MAX-100. :epth soLnders and fish spotters. Gatetime:1 sec Resolut tn:1 Hz. Ac- curacy: ± 1 cow +tinE base error. Input The rrrultimode,psolfessional porta- ' Troubleshoot rig u trasonic remote' p= Doupling: AC. Sine -:hat gives you controls. For hese, and hundreds of Impedance:1 tVS1/56 ble frequency courts Wade Sensitivity. 30 rrVFMS @ 50 MHz. In- you'll find it ind is- . nore range, visici its accuracy and ether appl ca=ions ternal Time Base Frequency: 3.579545MHz =,rersattlity than anv_ comparable unit , zensab e - crorstal osc. Setabdity: ± 3 ppm @ 25`C. et anywhere near. i=s fcw, low price. MAXimWII risibility. MAX -100 Temp -Stability: Better Mari 0.2 ppm/C, - "eatures a cig bright 0.6" multiplexed 0 5)°C. Max. Agirg:1 apym/year. Display: MAXimum p3r1ormance. LED d-gits; anti -g Ere window. Lead - 3 -digit LED display, with leading - Eight .6" MAX- ] 00 is a cinch to use. It gives 'zero blanking: devimalpoiit appears b3tweén ° pro blan< nc. So you don't have to You continuous reai'rtgsfrom 20Hz 6th and 7th dig twien inaltexceeds 1 MHz. - orwor< LID close. And, MAX's :o a guaranteed ;0JMHz, with 8- o Equint, Oierflow:wit sieralsovs-99,999,999Hz, i.s -in. digit accuracy. Fas- eadings with = ip-up stand guilt most (left hard: digit flashes,allow- in excess of 100 MHz. Display T/6 -sec. update arc 1 -sec. sampling MAXimum flexibility. MAX -100 ing -eadings ovate: 1 /6-seoord plus 1 sec. gate time. Low -ate. Precise readirgs, derived from a ti om tcu: power sources, for =perates Battery Indicate,: When Drver supply falls crystal-controlledtimE base with in labor f elc. Internal alkaline or _se tlastt © 1 Hz rat. High -sensitivity belcw 6.6 VDC, afl cigits 3ppm accuracy `iiCad bat -en-es. 110 or 220V with Flashing display ettendsba1ery life. Power: 6 as low as 30 eadirgs from signs harger/eim na-o-. 12V with auto- A.a Alkaline or NiCac celf5 iiternal); External: nV, w th diode cve-load protection -labile cizarelte-lighter adapter/ 1"Cor 220/VAC Eliminator -charger; Autociga= Jp to 200V peaks. eharger And extamál 7,2-10Vsupply. Ate. lighter adapter 7.2-1911DC ext. supply; Irput signals ever 1 00MHz auto= Bat. Charging:12-14hr Eke (HWD):1 75"x MAXF 1um value. With all its matically flash tie most significant 5.53" x 7.75" (í.45x 14.20x 19.69 cm.) specs, you'd expect MAX digit. And to indica_e Icw-battery con- mpressi'e Weight: Less rhar -.5 It. C.68 kg) w/bEtteries. cost a I_t rr ore t -an a low $134.95, p -lead input cable; iitionand exterdr Training battery Accessories Inclided:CI complete ip-lead cable and manual. I fe, the entire dispey f ashes at 1 Hz. Epplica_ionslns=ruction manual. But CZINTINENTAL SrE CIALTES CORPORATION NAXimumvarsatility.'Wherev- _cat's anther nice thing about MAX: er anc whenever roJ need accurate -` _cough t'}accurate enough for lab frequency readings MAX can do the _se, it's+A,ElI vwrtr-in the reach of hob- jab. Use it with clip- ead cable sup- yists' and CB-ers' budgets. 76 Fulton Terrace, 3ox'542, tver -laven, CT 06509 plied.Mini whip art~ma. Or low -loss Try MAX or icurself at your CSC 2E3-624-3103 TW< 71)-465--2: V1 ET COAST: 351 Calaornia St. San Francisco, CA 94104, us for full specs h -line tap with UH=ccnnectors. For sealer-o- contact 415.421.8872 TWX 313-372-7.952 II GREAT BRITAIN: CSC LK LTD. AM orFM; CB, ham,bLsiness radio - and your ocal dealer's name. Once ;o Sru Road, North helium Traci na Estate, " and RdC transmitt`rcr receiver align- 5,ou seeltcw hardy MAX is, you'll FAItIam, Middlese:,Eryland. ment. Monitoring 3_dio and RF gen- ..cant to ""req our too. With CSC. 01-290-8782 Int'I -e:er 851-281.5669
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AmericanRadioHistory.Com square wave for an Good soldering oscilloscope display. not by any means proven, I hasten to But even so, in comparison with a cut- point out.) Properly executed direct -disc begins with ting lathe, most tape machines come off recording is inherently quiet, so you can a distinct second best, all possible get rid of all the black boxes. the right things being considered. (4) Improve. The tape medium in its At present, phase shift is a controver- present form is seriously limited by noise solder selection sial subject in audio circles. It's easy to on the one hand and magnetic -satura- demonstrate that you can put a square tion effects on the other. The disc medi- Different soldering applications require dif- wave through huge amounts of it and um is temperature, excursion, ferent alloys and different fluxes. Even dif- and ve- ferent combinations of the two. You can't never hear the difference. But on the locity limited. Temperature is always a solder stainless steel, a pc board or other hand, process it in another way consideration; it is readily possible to aluminum with the same material. It just and you might hear a very won't work. And that's a fact. distinct differ- burn out the coils of a cutter head. But Now Multicore makes soldering easy. ence. And, of course, keeping track of temperature considerations are largely Not to only select the right solder. But to phase phenomena in a modern record- irrelevant to noise and distortion. As use it also. The flux is included in for the sol- ing der as multiple cores. And in just the right facility handling music signals by excursion and velocity, a modern cutter ratios. There's no mess. Nothing to add. means of multiple microphones, several can create a groove that undulates Think of it. Multiple cores for better distribu- tape machines, numerous signal widely and rapidly tion of the flux. You solder faster. Use less enough to throw any processors, solder. Get better results. And that's a fact and finally a cutting lathe is available playback stylus into fits of mis - too. staggeringly complex. In fact, in practice tracking. Hence a tape recordist cón- Prove it to yourself. no one really attempts to do it; everyone stantly flirts with distortion to maintain down the line just tries to trust his ears. dynamic range. A disc recordist need This is one of the cases frequently worry only about seeing smoke-and made for direct -to -disc recordings, the about the possibility of cutting a groove recent proliferation of which has come that no consumer record player will be as a great surprise to many both within able to follow. Thus, disc recording is su- and outside the music/recording indus- perior (theoretically) in performance po- try. To take the points made by the di- tential and overall flexibility. Send For Your rect -cut recordists and their disciples in (5) Rationalize. The disc medium Solder Sampler Kit some sort of order: does of course have some serious ulti- Consists of 5 special solders each in a feed-out (1) Simplify. Eliminate all those gener- mate limitations, most metal dispenser. Totals over 60 ft. for every of them con- solder requirement. ations of tape, which can only degrade cerned with the fact that an LP record is ELECTRICAL: Best general purpose solder with rather than exalt the final result, and only 12 inches wide. Grooves take up non -corrosive rosin flux for all types of wiring. Savbit® formula protects soldering iron tip from take the music right to its final recorded space, and the more vigorous their ex- wearing out. form as directly as possible. cursions the more space they take up. It ELECTRONIC: A 60/40 tin/lead alloy, but extra (2) thin (22 gauge) for electronic applications. Non- Again, simplify. A direct -cut re- occasionally happens that a recording corrosive rosin flux cores. cording must take place in real time, and studio sends a 60 -minute tape, full of STAINLESS STEEL AND SILVER JEWELRY: it is absolutely final. The A tin/silver alloy with special flux; contains no mixing engineer electric bass and kick drum, to a disc - lead. Blends in so well, you can hardly tell where will therefore have to decide on his basic mastering house with instructions to turn its been used. balances right at the start, and forget it into a single LP ALUMINUM: Special flux and silver alloy com- that is louder and bas- bination for soldering aluminum. There's nothing about any possibility of "fixing" them sier than anything in the "Top Ten." like it on the market. somehow in a later mixdown session. Well, it simply can't be done. So the disc PLUMBING AND SHEET METAL: For most metal joining applications except aluminum. He will also realize that any wrong move engineer curses the tape engineer, and Uses acid type flux. he makes at the mixing console will ruin finally some compromise is worked out an entire LP side, every single note of whereby the tape is either "conditioned" ALL 5 FOR $895 Shipping and handling included which will have to be rerecorded. On the to suit the disc's limitations and/or some assumption that an engineer/producer's material is dropped. Now had the disc Plus Bonus Pak of second and third guesses are frequently engineer been involved from the mo- Emergency Solder worse than his first (made when the per- ment the first microphone was set up, A flat, tape-like solder that melts with a match, formers were actually present and play- making available his intimate ideal for most on -the -spot emergency repairs knowledge ing), the direct -to -disc approach im- of the potential and limitations of his MULTICORE SOLDERS poses a harsh discipline that will (theo- equipment (with which the tape DEPT. PE 178, WESTBURY, N.Y. 11590 engineer retically) make for a better final record- often has a O Send me a "Solder Sampler Kit" at the only passing familiarity), the special $8.95 price (limit of one per person) ing. It will also serve to make the engi- final recording would be (theoretically) and include my bonus Emergency Solder. neer/producer much more conservative, much more rationally and carefully pro- NAME which is the way audio purists generally duced. I need hardly point out that, in a ADDRESS think he ought to be. direct -to -disc situation, the disc engineer CITY/STATE/ZIP (3) And yet again, simplify. Many audi- is present right from the beginning. - Check or money order must accompany order ophiles N.Y. State residents add approp. Sales Tax and many audio professionals suspect that the Dolby system and other The Consumer View. Everyone I FREE Solder User's Guide noise No purchase required. Just circle reader service card. -reduction processors, which have know who has heard any of the better di- largely contributed to making the whole rect -to -disc productions has recognized multitrack recording technique possible, their sonic merits to at least some de- are responsible for considerable audible gree (the musical merits of some of degradation of the final result. (This is them are debatable, though). I will never
16 CIRCLE NO. 26 ON FREE INFORMATION CARD POPULAR ELECTRONICS
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forget the expression on the face of a first hearing the Lincoln Mayorga 6º EARN$ au- (Shef- widely known and respected tape Brahms-Handel piano coupling thority when he heard the concluding fin- field Lab 4) was that the performance, MONEY. ger -cymbal "ping" on the "Peace Train" although not likely to devastate the mu- cut (Sheffield release number 2) come sical world, had a very satisfying vitality, as a through his speakers. And that points up flow and continuity. Continuity is forced one of direct -to -disc's distinct advan- upon a performer by the direct -cut pro- Wilson Dealer . tages: the disc medium is capable of cess; a cutting lathe cannot be stopped You can make large profits considerably more dynamic range at at mid -LP side and then restarted. Many high frequencies than is the tape music appreciators seem to feel that the as a lucrative Wilson Dealer of current Citizens Band and Amateur pro- medium. As Craig Stark clearly pointed patched -together performance made ducts: Base Station and Mobile out in an article in the November issue of possible by tape editing has become a Antennas, Crank -up Towers, Ro- this magazine, tape will actually lose wretched excess-another instance in high -frequency energy the further it is which direct -to -disc imposes a possibly tors, Amateur Radios . . . and more! driven into saturation. The disc medium, beneficial discipline on all the parties particularly if a CD -4 cutting stylus is that are involved. The Dealer Program provides used, will not lose "recoverable" energy Most people believe that economics delivery for prepaid freight, fast in this way; it may actually gain energy will determine the final fate of direct -to - of in -stock products, sales assis- from distortion products (which may disc recording. As far as I know, you with extensive national tance - come from overload of the cutter -head cannot buy a direct -cut disc for less than advertising and free descriptive amplifiers, the cutter head itself, or your about $12, which may be a bargain be- Get the details of how, literature. playback stylus or electronics). cause these recordings are not cheap to easily you can qualify in your Otherwise, reaction to the direct -to - produce. The one truly large-scale pro- area, no inventory marketing disc phenomenon seems to be mixed. In duction to emerge so far is Telarc's re- investment required. what I think is the majority view, serious cording, distributed by Discwasher, of listeners believe that a disc recording the Cleveland Orchestra playing selec- Fill out and mail originating from a tape source can be tions of Berlioz and others. (However, the coupon below just as technically satisfying, although it look for at least one big orchestral re- and we will send may not be capable of quite so many lease from Sheffield at any moment.) I all the details. sonic pyrotechnics. I won't comment ex- have nothing but admiration for the dedi-
cept to say that most recordings I hear cated people who embarked on this pro- are far from equalling the better direct - ject, but it must have been frighteningly to -disc productions. Of course, this is expensive to finance. And it is, alas, readily attributable to the typical record's flawed (flawed in my opinion by an im- being a mass-produced product-a proper application of multi-miking tech- carefully mass-produced product, yes, niques-a practice that the "simplicity" but one that does not génerally receive philosophy of direct -to -disc seemed more care than what is considered nec- destined to resist). As has been pointed essary for mass -marketability. When out, the recording does not offer an someone goes to the trouble of produc- overwhelming amount of music per side, ing a direct -to -disc recording, he is not both because the sides were intended to likely to neglect the subsequent metal- be of the highest quality and because work, pressing, and packaging that will the recording engineer had to space the bring it to the consumer in the most at- grooves by intuition. (When you cut a tractive form possible. Some, like the record from a tape, a "preview" head Umbrella albums distributed by Audio some distance in front of the actual play- a and a .. Divisionmer Technica, bear prominent individual back head scans the tape directs Products serial number, and are treated in every computer to allow as much groove spac- way like a limited -edition fine arts print. ing-but no more-as is necessary to 4%sO%Copp. (Incidentally, direct -to -disc recordings accommodate the musical violence that are true limited editions. When all the is to follow). m e ecttonICSoiuinl na, parts involved in pressing the record, Still, the Telarc/Cleveland production from lacquer to metal master to mother has some exciting things to be heard, if "The fastest iGgtso po,a.. in Coro"'o" to are worn out, the recording sound system and your aural ex- 739.1 stamper your gg1 917021 ceases to be available unless the per- pectations are as demanding as my F Las V egos, formers go back into the recording stu- own. As listeners to recorded music, we it direct - may never encounter its like again. And I am interested in a Wilson Dealership. dio and do all over again. Some Please send details. to -disc producers even skip the mother - there is one thing everyone is hopeful Name stamper stages and press from the met- about: that the conspicuous success of Address al masters, which makes the edition the direct -to -disc revolution will force the City State_ Zip even more limited, although of potential- standards of all recorded music to be- At the Phone ly higher quality.) come that much higher. present, Aesthetics may also deserve a part in great body of recorded music has a long CB Products O Amateur Products a the direct -to -disc picture. My reaction on way to go. 2 POPULAR ELECTRONICS
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AmericanRadioHistory.Com Julian Hirsch HIRSCH/HOUCK LABORATORIES J " Audio Reports L.
LOUDNESS CONTROL -BOON OR BANE?
MOST PEOPLE, when they first see a knob la- Fig. 1. As we shall see, their validity, or lack of it, as belled "loudness" on a high-fidelity amplifier or compared to the results obtained in later experi- receiver, probably assume that it is just a volume con- ments, has little bearing on the subject at hand. The trol under a different name. To be sure, it does control contours represent the sound pressure level (SPL) re- volume, but the distinction between a volume control quired at various frequencies to sound as loud as a and a loudness control is much more than a matter of 1000 -Hz tone does at the indicated level. semantics or word choice. Early hi-fi enthusiasts were quick to relate the phe- In the earliest days of hi-fi, people became aware nomenon of apparent loss of bass at low volumes to that, when the volume of a musical or vocal program the Fletcher -Munson effect. If their findings were cor- was reduced, the balance between the low, middle, rect, it would be reasonable to assume that, if a truly and high frequencies was altered. The apparent bass high-fidelity recording of a musical performance volume decreased much more than the mid -range, or which would be heard at levels of 90 dB or more in overall volume level, and to a lesser extent there was the concert hall were to be played in the home at a 60 - an exaggerated loss of highs as well. The effect was to dB average level, there would be a considerable loss give a program a thin, constricted sound at low listen- of apparent bass response. In fact, the Fletcher -Mun- ing levels, even when the system was capable of de- son contours show that a 30 -Hz tone would have to be livering a full -frequency -range response at normal boosted in level by about 25 dB tó sound as loud as a listening levels. 1000 -Hz tone at 60 dB but would require a correction The explanation of this effect lies not in the equip- of only about 3 dB at 90 -dB levels. ment, but in a property of the human ear. We do not An apparently simple and logical solution to this hear all frequencies with equal loudness, even dilemma would be to build a frequency compensat- though they may impinge on the ear with equal inten- ing circuit into the volume control of the amplifier so sity. The ear is most sensitive at about 3500 Hz and that reducing the midrange level boosts the bass (and slightly less so at lower and higher frequencies, even possibly the treble, although there are differing views at high volume levels. In addition, the change in on this) in the correct amounts to conform to the hearing sensitivity (the human frequency response, if shape of the equal -loudness contour for each listen- you will) is also level dependent. At sound levels of ing level. This is essentially what has been done (or at 90 dB or more (a rather loud level for home music re- least attempted) in the vast majority of amplifiers and production) there is relatively little difference in receivers manufactured for the high-fidelity market in hearing sensitivity over much of the audio range, ex- the past 25 years or more. cept for the broad peak in response at about 3500 Hz. Unfortunately, although all of these loudness corn- As the absolute sound level is decreased, low fre- pensators do pretty much what they were designed to quencies must be emphasized proportionally in order do (electrically), most of them fail dismally to make a to sound as loud as a 1000 -Hz reference tone. The recording or broadcast sound as natural at low levels same sort of emphasis is required at high frequencies as it does at higher listening levels. Worse, most of for equal apparent loudness, except that the shape of them make the sound so tubby and heavy that few se- the curve at high frequencies changes very little with rious music lovers would even consider using the changes in loudness. compensation. Fortunately, in almost every amplifier, A number of acousticians have made experimental it can be switched off, leaving the "loudness control" studies of this effect. Perhaps best-known were to act as a normal volume control. Fletcher and Munson, of Bell Telephone, Laborato- To see why these schemes fail, take another look at ries, whose findings were published in the early the Fletcher -Munson curves. Each is related to a 1930's. Subsequently, other investigators derived specific sound pressure level at the listener's ear. somewhat different families of curves that relate sub- Now look at the family of loudness compensation fre- jective loudness to frequency and level. The Fletcher - quency -response curves in Fig. 2, which are typical of Munson Equal Loudness Contours are reproduced in the performance of most modern amplifiers and re - 24 POPULAR ELECTRONICS
AmericanRadioHistory.Com 130 120 120
110 110
loo 100
90 - 1. -Munson curves 90 Fig. Fletcher 0 show how perceived loudness 80 W 8o varies with frequency even > J 70 though test signal amplitude 70 remains constant over range. 60. W 60
50 50
40' 40
ÍO 30
20
10 o0 20 00
FREQUENCY H ceivers. Each is related to a specific amplifier volume bly, this point seems to have escaped the attention of control setting, with 0 dB corresponding to a max- the vast majority of receiver and amplifier designers. imum volume setting. Unfortunately, there is no rela- (They know better, of course, but marketing consider- tionship between the two sets of curves. Even their ations tend to dominate the situation.) The end result shapes are different, but if they were alike, the situa- is the almost universal use of a simple tapped volume tion would be no better. Depending on the gain of the control with a capacitor or a simple RC network that amplifier, efficiency and frequency response of the comes into play at a certain control setting, regardless speaker systems, size of the listening room and its of program level. furnishings, listening level preferences, particular re- All of the equal -loudness contour curves were de- cording, sensitivity of the phono cartridge, acoustic rived from measurements made on numbers of hu- conditions under which the recording was made, and man subjects and statistically processed so that the other factors equally beyond the listener's control or result is a sort of composite or "average" hearing re- knowledge, the amount of boost provided by the sponse. Statistics being what they are, there is always loudness control may be nearly correct. However, it is a good chance that you or I will hear things different- more likely to give too much or too little compensa- ly from the predictions of the curves. Even if the com- tion at any given frequency. There is literally almost pensation worked perfectly, it would not be correct no chance for such a system to perform properly. for us. In this author's opinion, the exact compensa- It would appear to be self-evident that any type of tion curve used at any given control setting is rela- loudness compensation must have a means for inde- tively unimportant, since the whole process is at best pendently setting the absolute listening level and the a crude approximation. Any of the proposed compen- amount of compensation applied. In effect, this sation curves, when applied correctly, is probably means two volume controls are required. Inexplica- better than nothing. However, when they are applied
+10 11
MAX VOLUME SETTING (0 dB)
} Fig. 2. Loudness compensation -10 -001- curves typical of performance of most modern amplifiers and receivers. Each is related to a W N - 20 68 specific volume setting. g 20 v mummmr- a. r.
re
-5068 30
40
-50 20 20000 FREQUENCY H JANUARY 1978 25
AmericanRadioHistory.Com incorrectly, it is certain that any of them is worse than This may seem paradoxical (after all, we do want to nothing at all. change the volume), but the key word is "seems." The situation is not completely hopeless, however. A case in point is the Yamaha Model CR -2020 re- The handful of receivers and amplifiers that do have ceiver reviewed in this issue. It is astonishing how lit- separate volume and loudness controls can usually be tle the quality of the program changes as the loudness made to sound at least acceptable when loudness control is operated through its full range, yet the mid- compensation is used for low-level listening. Some range level has changed by 20 dB, or a power ratio of are better than others, and individual preferences cer- 100 times. The program becomes less loud, but al- tainly play a part in such quality judgments. One of most imperceptibly so because the frequency balance the best indications of a good loudness compensation is maintained at a subjectively constant value. This is system is that the loudness of the program hardly the entire justification for the loudness control in the seems to change as the control setting is changed. first place.
YAMAHA MODEL CR -2020 AM/STEREO FM RECEIVER Medium -high -power receiver has exceptionally versatile operating flexibility. switch is provided for situations where one cannot hold the tuning knob, as when changing antenna orientation. CZ/ii/I1111111 At the lower right of the front panel is a large VOLUME control knob, behind OVxluu ...-.... which is a center-detented BALANCE 7=a° .' 1,7m1 1,f- r. Y r..r_+uR. r_¢i4alv_ - (>.;") ring. The other controls are arranged in ! Q functional groups, with the tone controls -_ at the lower center of the panel. The BASS, TREBLE, and PRESENCE controls each have 11 detented positions. But- tons above them can be used to change Í All Yamaha hi-fi To the left of the dial are three meters. the bass and treble turnover frequen- HIRSCH- recievers share The FM TUNING meter is a conventional cies, with a choice of 125 or 500 Hz for HOUCK a family -of The the bass and 2.5 or 8 kHz for the treble. LABS basic center -channel indicator. other REPORT resemblance. The two meters are labelled sP ouT; they in- The action of the PRESENCE control is Model CR -2020 dicate the voltages across the speaker centered at 3000 Hz, unlike the usual AM/stereo FM receiver represents no terminals and are calibrated logarithmi- midrange tone control that operates at exception. It is rated to give 100 watts/ cally in watts delivered to 8 -ohm loads 1000 or 1500 Hz. A button located be- channel into 8 ohms from 20 to 20,000 over a range of from less than 0.01 watt tween the turnover selectors is used to Hz with less than 0.05% total harmonic to 200 watts. The center meter, more- switch in and out the tone controls. distortion (THD). The receiver's front over, serves a dual function. In addition The LOUDNESS compensation control, panel has a simple rectangular dial cut- to being an sP OUT meter, it also serves located to the right of the tone controls, out with no bezel or decorative trim as a SIGNAL Q meter to indicate the sig- is a Yamaha exclusive. This 11 -position across the top of its silver-colored panel. nal quality and is, hence, a combination detented control allows a user to vary The receiver is supplied in an attrac- signal -strength and multipath-distortion the midrange gain over a 20 -dB range tively finished walnut -grain wooden cab- meter. When a signal has been tuned for while simultaneously boosting the low inet. It measures 211/4"W x 16i/4"D x a maximum pointer deflection and the and high frequencies relative to the mid- 61/2"H (54 x 41.5 x 16.7 cm) and antenna is oriented for minimum fluctua- range. With the LOUDNESS control fully weighs 42.5 lb (19.3 kg). National adver- tion of the meter's pointer, the signal is clockwise, the response is flat and the tised value is $700. heard with the least amount of noise and VOLUME control is set to give the loudest distortion. listening level one expects to use. Then General Description. The FM scale A button under one of the meters con- when the volume is adjusted with the has linearly spaced calibrations at 0.5 - verts the center meter to a full-time SIG- LOUDNESS control, a proper balance is MHz intervals and red LED's that indi- NAL a meter when it is depressed, simul- maintained between the different fre- cate which tuner section (FM or AM) is in taneously disengaging the other SP OUT quencies without the unnatural heavi- use. The dial "pointer" is a piece of plas- meter. In normal use, with the button in ness that mars the sound of most loud- tic that resembles the cursor on a slide its out position, the function change oc- ness -compensation systems. rule, with a fine red line that facilitates curs automatically. As soon as the tun- The MODE selector can be used to precise frequency readings. The smooth ing knob is touched, the center meter in- connect either channel or their sum to flywheel mechanism that drives the tun- dicates signal quality. Releasing the both audio channels as well as to pro- ing system is operated by a large alumi- knob automatically switches the meter vide normal and reversed channel num knob to the right of the dial window. back to indicating output power. The stereo operation. The INPUT SELECTOR
26 POPULAR ELECTRONICS
AmericanRadioHistory.Com 1.0 4 ) i i l 4 1{ 1 1 { 1 I II 1 YAMAHA CR -2020 YAMAHA CR -2020 REFERENCE POWER1100W1 0.5 14111 TO AL HARmONIC DISTORTION 0.5 .HALF POWER(-3dRI POW - - - - 60/7000 0, 10 Il IM DISTORTION -----LOW ER 1-10,91
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`y 02 `J ' \ 01 »7d
.005 Ns,. 005 `awa..r, TEST EQUIPMENT RESIDUAL ---`-...! 'J
002 1 2 5 10 20 0 100 200 500 1000 002 --- ...... _ .,.._ ...._ ...... n CONTINUOUS AND EQUIVALENT FREQUENCY IN Hz (CYCLES PER SECOND) SINE-WA'.E POWER OUTPUT PER CHANNEL IN WATTS 1000 -Hz total harmonic distortion Total harmonic distortion at rated and 60/7000 -Hz IM distortion. (100 W), half, and low power.
and REC OUT SELECTOR, unique to the controls an afc system that is automati- There are also two PHONES jacks on the entire Yamaha receiver line, are entirely cally deactivated when the tuning knob panel. independent. This setup allows one to is touched. When a station is tuned in On the rear apron of the receiver are a tape from any source while listening to and the tuning knob is released, the afc full complement of phono-jack connect- any other source. system comes on slowly. With the OTS ors for the signal sources, three sets of The INPUT SELECTOR has positions for button engaged, the OTS is disabled at insulated spring clips for the amplifier TAPE 1, TAPE 2, TUNER, PHONO, and AUX. all times. outputs, and antenna terminals for 75 - The REC OUT SELECTOR can supply Completing the front -panel control and 300 -ohm FM antennas and a wire - either one or two tape decks with signals lineup are lever switches for POWER and type AM antenna. The ferrite -rod AM an- from TUNER, AUX, Or PHONO sources Or LOW and HIGH FILTERS and a rotary tenna is hinged. Separate PRE OUT and from the preamplifier output (PRE our). switch that connects any or none of MAIN IN amplifier connectors that are The last permits the full tone -control and three pairs of speaker systems or two normally joined together by a slide filter capability of the receiver to be used combinations of two pairs at a time to switch make it possible to insert signal - ahead of the tape recording process. the amplifier's outputs, The FILTER processing devices between the two There are two cross -connected dubbing switches each have three positions with parts of the circuit. There are also three positions for copying tapes from either center OFF. The Low turnover frequen- accessory ac outlets on the rear apron, machine to the other and providing the cies are nominally at 15 and 70 Hz, the one of which is switched. capability of monitoring the playback HIGH at 8000 and 12,000 Hz. All filter from either deck with the appropriate slopes are at a rate of 12 dB/octave. Laboratory Measurements. Ya- setting of the INPUT SELECTOR. Above these switches is a row of LED's maha does not use the "standard" Above the tape switches are a TUNER that indicate the status of the POWER, method for rating the distortion and button that allows selection of either AM TONE CONTROL, AUDIO MUTING, FM noise performance of its receivers. The or FM reception and a small PHONO se- BLEND, and OTS switches and when a company's Noise -Distortion Clearance lection switch with positions for a mag- stereo FM station is being received. Range method is an expression of the netic and a moving -coil cartridge input. +10 I 1 YAMAHA CR-2020 (The receiver has a built-in "prepream- FM SECTION II . plifier" for the very low output of moving - AUDIO OUT UT I ,I coil cartridges.) The AUDIO MUTE button, 0 d8=1 VOLT iri TAPE -OUTPUT JACKS located near these controls, permits the -20 IHF USABLE SENSIT VITY MONO:I2dBf (2.23..V1 u.. li-:l audio level to be reduced by 20 dB for ST REO: 7.814.3yV) 30 I I temporary interruptions. m
I :I Other buttons under the dial scales in- d 40
m ; clude switching for an external DOLBY N ó- r FM ADAPTER, which simultaneously 1 changes the deemphasis from 75 to 25 -60
FM BLEND for noise reduction on I :I 'I NOISE µs; _7p.5040 QUIETING SENSIT VITY weak stereo signals; FM MUTING, which MON014.25d8f (2.ByV)AT 1% THD STEREO' NOT MEASURED -MONO in its OFF position switches the tuner to --STEREO mono operation; and MUTING LEVEL for 0 0 20 30 40 50 60 80 90 100 selection of either a 3- or a 30-µV mut- INPUT dBE ing threshold. The final button, labelled ors (Optimum Tuning System), actually Noise and sensitivity curves for FM section of receiver. JANUARY 1978 27
AmericanRadioHistory.Com total noise and distortion in the output of -82 and -72 dB, which in addition to FREQUENCY RESPONSE the amplifier as a function of output pow- 10 the very low distortion readings tend to er when measured with a conventional confirm Yamaha's NDCR rating. In spite --20 null -type distortion meter. This part is l YAMAHA CR 2020 of its high sensitivity, thé phono input quite where the STEREO FM standard; departure 3 AVERAGE IBOTH CHANNELS overloaded at a very high 280 -mV input. from the standard arises is in making the s` No measurements were made on the o _p I III measurement through the preamplifier OTS OFF moving coil "prepreamplifier." át 1000 Hz with the voLUME-control set 5 S . CROSSTALK - The FM tuner section was in many
`LI ITII 2 20 db below its maximum. SIION ways as impressive as the receiver's -6 Si41..._á au- In the case of the Model CR -2Ó20, Ya- 20 50 100 200 500 IK 2K 5K MK 20 dio amplifier. In mono, the FREQUENCY IN Hz IHF sensitivity maha's NDCR rating is less than 0.1% was 12 dBf (2.2 µV) with 1% distortion. noise and distortion between 100 mW Frequency response and crosstalk In stereo, the IHF sensitivity was 17.8 and 100 watts output into 8 ohms. This with optimum tuning in and out. dBf (4.3 µV), but the 50 -dB quieting sen- represents very good performance, sitivity could not be measured accurate- especially at the low -power énd where Hz. The action of the PRESENCE control ly because of a considerable level of 19 - the distortion of most amplifiers is peaked at 3500 Hz and had no effect be- kHz pilot carrier signal that masked the maskéd by noise. To a great extent, this low 1000 Hz or beyond 10,000 Hz. noise level in the audio outputs. The pi- is due to the usé of a dual -volume con- Sihce the maximum range of this control lot carrier level was -48 dB, making this trol, with one section before the tone was ±6 dB, extreme effects were not one of the very few specifications in control amplifier and the other following possible. It was much more subtle in its which the receiver fell Short of its pub- it. This causes the noise to drop steadily action thah some earlier so-called "pres- lished ratings. (The rated suppression is as the volume setting is reduced, yet ence" controls we had seen. 60 dB, which is not a particularly low fig- minimizes the possibility of overload The filters are among the best to be ure, either.) from a high-level input signal. found on a contemporary receiver. The The distortion at a 65-dBf (1000 µV) We did net measure the NDCR as measured cutoff frequencies of the HIGH input was 0.085% in mpno and 0.16% in such,, but much of the same information filter (where the response was down 3 stereo, and the mono S/N at that input can *be inferred from our normal mea- dB) were 7 and 10 kHz, and with its 12- was 72.5 dB. These measurements surements. The one -hour pre -condition- dB/octave slope, it was possible to re- were made, as the IHF standard speci- ing period at one-third power.máde the duce hiss significantly without a serious . fies, with the AFC (OTS) turned off. receiver quite hot, especially on the effect on program quality. The Low filter Turning it on resulted ih a substantial in- grille above the output transistors, but had its -3 -dB frequency at 75 Hz (in its crease in distortion, to 0.58%. Carefully with no ill effects. The outputs clipped at 70 -Hz position) and was an effective centering the tuning meter actually 130 watts/channel, with both channels rumble filter. In the 15 -Hz position, the made 'the distortion greater, yielding a driving 8 -ohm loads at 1000 Hz. The 4 - response was down 2 dB at our lower 0.75% reading. The stereo distortion, and 16 -ohm clipping levels were 172 measurement limit of 20 Hz. with L -R modulation and OTS off, was and 82 watts, respectively. Yamaha's loudness compensation is, 0.4% at 100 Hz, 0.089% at 1000 Hz, and Thé 1000 -Hz THD was below the in our opinion, one of the best (if not the 0.12% at 6000 Hz. 0.003% residual of our test equipment best) currently available. It is probably The FM frequency response was rul- from 0.1 watt to more than 50 watts out- the only one we are able to use without er-flat, varying no mere than about ±0.1 put and was only 0.007% at 120 watts, unacceptable deterioration of listening dB from 30 to 15,000 Hz with the QTS just short of the clipping.point. The IM. quality. As the control is turned counter- on. With the OTS off, the response was distortion was 0.057% at 0.1 watt and clockwise, the loudness drops almost much the same, except that the tuner about 0.1% in the 10 -to -130 -watt output imperceptibly, because the apparent fre- section switched into mono below 50 Hz range. Even at a very low output of 10 quency balance remains constant over for some inexplicable reason. This was mW, the IM was under 0.1%, which was the full 20 -dB range of the control. (That one of several strange effects we ob- an indication of the relative absence of range is somewhat limited and might re- served, mostly relating to the automatic crossover distortion. quire the main VOLUME control to be re- functions df the receiver, such as the At rated power and below, the THD set from time to time, but this is a small OTS and the meter function switching. was 0.02% to 0.03% at 20 to 50 Hz price to pay for the listening benefits of For example, the stereo channel sepa- (approximately the residual of the test the system.) ration was virtually uniform at 44 to 45 equipment at those frequencies). It re- The RIAA equalization error of the dB from 100 to 12,000 Hz and still a su- duced to 0.003% to 0.006% at middle phono preamplifier was too small to perb 40 dB at 30 and 15,000 Hz with the frequencies and increased to 0.01% to measure, being less than the inherent OTS off. Turning on the OTS improved 0.015.% at 20,000 Hz. The risetime, ±0.25 dB resolution of the General Ra- the separation dramatically to an almost through the Aux inputs, was 5µs, and dio frequency -responsé plotter. Thé unbelievable 59 to 60 dB between 500 the slew rate of the amplifier was 21 equalization changed by less than 0.5 and 2000 Hz. volts pér microsecond. dB at ány frequency when measured The other tuner performance charac- As might be expected, the tone con- through the inductance of a typical pho- teristics ranged from good to excellent. trols could provide almost any desired no cartridge. The capture ratio was 1 dB at a 45=dBf responsé characteristic. With the 125 - The receiver hás an unusually high (100 µV) input and 0.8 dB at 65 dBf. The and 8,000 -Hz turnover frequencies, a audio gain. It required only 35 mV at the AM rejection was a very good 70 dB. Im- considerable variation was possible in AUX inputs, 0.58 mV at the PHONÓ input, age rejection was about 88 dB. Alternate the output at the frequency extremes, for a reference output of 10 watts. The channel selectivity was 74 dB, and adja- with no effect between 300 and 3000 respective unweighted noise levels were cent channel selectivity was 4 dB. The
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AmericanRadioHistory.Com stereo threshold was 12 and 33 dBf (2.2 ness compensator in the business, but off and returned to, zero. On program and 25 µV) in the alternate positions of its operating flexibility is extraordinary. material, the meters could be driven to the MUTE switch. The corresponding The receiver competes with a host of about 50 watts before the same thing muting thresholds were 14 and 35 dBf very fine receivers, but it can match any occurred. Obviously, this is not normal (2.7 and 30 µV). The muting had no hys- of them in sound quality and has few, if behavior, and we would not be surprised teresis allowing it to drop in and out with any, peers with respect to versatility. to find that a single fault was responsible almost no change in signal level. This is Yamaha does not use a low-pass filter for all of these mysterious effects. These undesirable, since a fading signal can in ¡ts FM audio outputs to remove the aré likely unique to our test sample, not rapidly jump in and out of steréo, with 19 -kHz pilot carrier. Instead, a proprie- the typical production run. more audible side effects than if the tary carrier cancellation circuit is used. The SIGNAL Q meter was an outstand- mute and unmute levels were slightly This gives a truly flat frequency re- ingly effective tubing aid. It accurately in- different. However, the muting action sponse, but in our test unit, it allowed an dicated relative signal strength and was very smooth and noise -free. undesirable amount of the 19 -kHz carri- 'multipath distortion over a wide range of The AM tuner section had a frequency er to leak into the program outputs. It is receiving conditions. Only an oscillo- response (and overall listening quality) probable that the adjustment of the can- scope might tell the user moré, but it far above the average. It had a notable cellation circuit had shifted on oúr test would be much more expensive and cer- lack of background noise and a frequen- sample. There were, of course, no audi- tainly not as easy to interpret as the me- cy response that was down 6 dB at 35 ble effects from the -48-dB level of the ter. Those listeners who depend on AM and 7200 Hz. carrier, although it did make some of our for any significant part of their listening measurements difficult, to perform. It will find the AM tuner in this receiver to User Comment. The Yamaha Model could easily cause problems with an be one of the handful that have accepta CR -2020 receiver was so outstanding in inadequately filtered tape recorder and bly good AM quality-in this case, much its performance that the few instances almost certainly with an external Dolby more than acceptably good. where it fell short of expectations are ob- unit. There would be no problem if the In sum, the Yamaha Model CR -2020 vious only because of the contrast. Even rated -60-dB suppression were ob- is an elegant receiver, tastefully styled so, the "plusses" so far outweighed the tained. and distinctively different from any of its "minuses" that we were left with a In addition to the strange behavior of competitors in appearance, operating strongly positive net impression of the the OTS system and its effect on distor- features, and performance. It is powerful receiver. tion and channel separation, the accura- enough for the majority of home installa- In actual use, the receiver was a plea- cy of the SP our meter could not be tions; yet it is not burdened by excessive sure to hear and to operate. Not only checked because at power levels ex- size, weight, or price. does it have just about the best loud- ceeding about 10 watts, the meters cut CIRCLE NO. 101 ON FREE INFORMATION CARO
OPTONICA MODEL RT-3535 STEREO CASSETTE DECK Features automatic program locating feature for cueing tape selections.
tance of about 2" (5.1 cm), which allows the cassette to drop easily into playing position. The cassette compartment door must be closed manually. (It can also be left
b4 ,e open during play.) If a cassette is al- 11 ready in the compartment, a firm pres- ,y - ° ® D li Ei l sure on the EJECT lever pops it out of the compartment for easy removal. Al- --- . ------=-7 '; E--..R.--.`..:. though the cassette compartment door has a window, the angle of the cassette Optonica's Model capstan is driven by a dc servomotor/ and the lack of internal illumination HIRSCH- RT-3535 tape voltage -generator setup, while a high - make it difficult to determine visually the HOUCK " a deck features a torque dc motor -drives the tape hubs. playing status of the tape. LABS ' RENRRT novel Auto Pro- The deck measures 183"W x 14"D x The other levers in the grouping are gram Locator De- 53/4"H (466 x 356 x 14& mm) and for controlling tape motion stop/start, vice (APLD) that can be used to cue rap= weighs 22.4 lb (10.2 kg). Its nationally turning on and off the record Circuits, idly to any of several Selections record- advertised value is $429.95. switching to fast forward or reverse ed on a single cassette. To some extent, wind, and activating the pause function. the APLD system overcomes a funda- General Description. At the left of It is possible to go from any operating mental limitation of the tape medium, the front panel is the tape compartment, mode to any other operating mode with- which usually cannot be readily ac- below which is the usual row of control out stopping the tape. The one excep- cessed in a random manner as can be levers. Pressing the EJECT lever causes tion to this is that the tape must come to done with disc recordings. the cassette compartment door to swing a stop before the EJECT lever is Oper- The front -loading deck, which is the upward into the machine. To load a cas- ated. There is an automatic mechanical company's top -of -line model, features sette, it must be pushed into the loading disengagement of the capstan at the two tape heads and two motors. The ramp at a slight upward angle for a dis- end of the tape.
JANUARY 1978 29
AmericanRadioHistory.Com high-level transients. The tape heads
r. are not accessible from the front. How- OdB ever, a small door on top of the deck can be removed to permit cleaning.
OPTON CA RT-3535 Laboratory Measurements. We CORD/PLAYBACK RESPONSE:, _ checked the playback equalization of ®8!9 111.iéé!?i ._r the. deck with TDK and Nortronics tapes ° for the "normal" (120-µs) EQ setting -20 dB u 19E11 and Teac tape for the 70-µs settings. In é both cases, the response was within ±1 ~Miff::: . . ) r:) ERIE dB from 40 to 10,000 Hz. The overall re- cord/playback response was then mea- with Maxell UD-XL TDK FREQUENCY (Hz) sured (normal), SA (Cr02), and Sony Ferrichrome response of Optonica RT-3535 with Sony FeCr tape. Record/playback (FeCr), as recommended by Optonica. The "normal" response had a slightly To the left of the control levers are two the two channels. Between the controls depressed upper midrange output, but microphone jacks, a stereo headphone and meters is a row of 10 small black was within ±2 dB from 21 to 15,000 Hz. jack and a pushbutton POWER switch. To buttons numbered 1 through 9 and C., The Cr02 response was flatter, with a the right of the cassette compartment plus a button with no identification. ±2.5 -dB variation from 22 to just beyond are three pushbuttons labelled SPACE, These are the APLD system controls. 15,000 Hz. The best overall 'frequency INPUT and LIMITER, respectively. The The APLD system functions in both response was with FeCr tape, which SPACE button is used in connection with the fast -forward and the rewind modes. varied only ±2 dB from 23 to 17,000 Hz, the APLD system to insert non -signal It senses the absence of a recorded pro- bettering the company's own specifica- segments on the tape; the INPUT switch gram between the selections recorded tion of 30 to 17,000 Hz. connects the recording preamplifier to on the tape. As an example of how it The Dolby circuits changed the either the LINE Or the MICROPHONE works, assume you wish to hear the fifth high -frequency response by no more sources (the two cannot be mixed); and selection on the tape, omitting the first than 2 dB at a -20 -dB level, and caused pressing the LIMITER switch automatical- four selections. A light touch on button no measurable change at a -40 -dB lev- ly prevents distortion from excessive number 4 will cause the deck to skip the el. The MPX FILTER had less than a 1 -dB signal levels when the recording level first four selections and stop at the be- effect on the response at 14,000 Hz, but exceeds 0 dB. The index counter and its ginning of the fifth selection. Then, all it attenuated the incoming signals by reset button are located immediately be- you need do is operate the PLAY lever to more than 20 dB at 16,500 Hz and high- low these pushbuttons. hear the desired selection. er frequencies. Three lever switches at the lower cen- When the number 4 button is touched, For a 0 -dB recording level, the input ter of the panel permit adjustment of the the unidentified button proves to be a was 72 mV through the LINE inputs and deck's operating parameters for differ- seven -segment numeric LED indicator 0.185 mV through the MIC inputs. The ent tape formulations. The BIAS switch that displays the number of the button playback output from a 0 -dB recording has positions labelled Low, MED, and activated (in this case, a numeral 4). depended on the tape used. It ranged HIGH. The EQ (equalization) switch has Each time the fast-moving tape passes from a maximum of 0.77 volt with TDK two positions labelled 70 µs and a third an interval between selections, the dis- SA to a minimum of 0.53 volt with Sony labelled 120 µs. Between the BIAS and played number decrements by one digit. FeCr tape. The limiter had no effect until EQ switches are legends for NORM, The C button clears the APLD sys- the input level reached +1 dB, but an in- FeCr, and Cr02 that indicate the recom- tem's memory. This permits the user to put of as much as +20 dB was held to mended settings for the three basic tape resume normal operation of the deck. If an effective 2.7 -dB increase in recording formulations. (A fourth formulation, low C is pressed during a fast -speed search, level, with only 3% playback distortion. noise/high output, can also be obtained the tape stops at that point. The meters had a 10% to 15% over- by changing switch positions.) The third The proper operation of the APLD shoot on 0.3 -second tone bursts and in- switch controls the Dolby noise -reduc- system depends on the absence of pro- dicated .+0.5 dB on a standard Dolby tion system that is built into the deck. It gram material for a duration of at least 4 level tape of 200 nWb/m. (The calibrat- has an OFF and two ON positions, the up- seconds between selections. When the ed Dolby level is at 0 dB.) permost connecting the MPx FILTER to user makes his own recordings, the At a 0 -dB recording level, the play- remove any 19 -kHz pilot carrier from FM deck is equipped to insert the necessary back distortion was 0.71% with Maxell signals in addition to providing noise re- silent interval automatically. To accom- UD-XL, 2.5% with TDK SA, and 1.8% duction. plish this, the SPACE button is first de- with Sony FeCr tapes. The reference At the upper right of the panel are two pressed and at the end of each selection 3% distortion level was reached at re- large illuminated dB meters, between the PAUSE lever is operated. This im- cording inputs of +6 dB, +1 dB, and +3 which are a red RECORDING indicator mediately cuts off the recording signal dB, respectively. and a green DOLBY indicator. At the bot- but allows the tape to run for a few sec- The IEC "A" weighted S/N reading tom of the panel are the OUTPUT control onds to provide the silent interval. (without Dolby) for the tapes, referred to (for adjusting the level of the playback The level meters are fast -responding, the 3% distortion signal level, was 60.7 signal simultaneously for both channels) peak -indicating types to minimize the dB with UD-XL, 57.4 dB with SA, and and separate RECORD level controls for chances of overloading the tape on 58.3 dB with FeCr tapes. With the Dolby
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AmericanRadioHistory.Com system switched in and using CCIR ments reveal, this is a very good record- recordings, made with the aid of the weighting, these figures improved to er, whose performance is generally of SPACE button on the deck, the APLD 68.5, 66.4, and 67 dB. At maximum the caliber one would expect from a ma- worked perfectly every time. gain, the noise through the microphone chine in its price class. This deck marks an auspicious entry inputs increased by 10 dB. But at usable One difficult test for many cassette re- for Optonica into the American audio gain settings, the noise increase was corders to pass is to record FM tuner in- scene. There are a host of cassette both inaudible and unmeasurable. terstation hiss at a -10 -dB level and to decks with generally similar features Although the headphone output was compare the playback with the incoming and performance, but this one offers designed for 8 -ohm phones, the volume signal. Most machines reveal varying something different. Perhaps not every- level was adequate with 200 -ohm degrees of dulling of the highs and one will find the APLD equally useful, phones as well. sometimes low -frequency colorations. but if random rapid access to one of a The flutter was 0.13% on playback The Model RT-3535, however, passed series of recordings on the same cas- only in an unweighted rms measure- this test with a virtually perfect reproduc- sette is of any importance to you, this ment and 0.14% in a combined record/ tion of the hiss, using TDK SA tape. machine offers an ideal answer to the playback measurement. The transport We found that the APLD system per- problem. Best of all, none of the funda- operated smoothly and quietly. In its fast formed well on most commercially re- mental performance qualities of a first- speeds, it moved a C60 cassette from corded tapes, but it could be "fooled" by rate cassette deck seem to have been end to end in about 82 seconds. an insufficiently long silent interval be- sacrificed in any way as a result of the tween selections or by unexpected si- inclusion of the APLD system.
User Comment. As our lab measure- lences within a selection. With our own CIRCLE NO. 102 ON FREE INFORMATION CARD
dbx MODEL 128 DYNAMIC RANGE ENHANCER Remarkably effective, versatile unit's operation is formidable to master.
rwn .OM .rovf 128 merits the recording compression slope. ° « , v '? Hence a 10 -dB playback level change ... .n coming out of the recorder is converted bii- s to the original 20 -dB change by the dbx "rw.r..: L,a....w,.,w.Ji circuits. The program dynamics are not modified in the recording and playback process through the Model 128, but any noise added in the recorder is reduced by the amount of the playback expan- HIRSCH- The expanders consumes only 10 watts of power from sion (values up to 30 dB are possible in HOUCK and compressors the ac line. practice). Unlike the Dolby and ANRS LABS from dbx have The Model 128 is compact, measuring systems, whose operation depend on 1 REPORT been a part of only 11"W x 103/4'D x 33/a"H (28 x 27.3 precisely controlled levels within the professional and x 9.5 cm) and weighing 8 lb (3.6 kg). Its system, the dbx system is virtually inde- home audio scenes for several years. nationally advertised value is $450. pendent of level. (A 60 -dB program During this time, they have undergone range can be located anywhere within considerable modification and improve- General Description. As a tape re- the unit's 110 -dB range without affecting ment to make them better, more unob- cording noise -reduction system, the the final results). trusive performers. The latest, and per- Model 128 compresses the signal going The successful operation of a corn - haps most effective, of the dbx devices into the recorder by a factor of 2:1. (A pander requires close matching of the is the Model 128 dynamic range en- 20-dB input change emerges as a 10 -dB recording and playback slopes and op- hancer. It is a remarkably versatile change in output.) The dynamic range of erating time constants. Since the same accessory that can provide noise reduc- the system is approximately 110 dB, circuits are used for both functions, dbx tion and dynamic range enhancement making it theoretically possible to com- manages to achieve this quite success- either separately or simultaneously. press a "live" program with a 100 -dB dy- fully. The detailed operation of the dbx The Model 128 is normally connected namic range into 50 dB, which can be Model 128 (employing what dbx calls into the tape recording and monitoring accommodated by any good open -reel the "dbx II" system) is quite complex. It path of an amplifier or receiver. The tape tape recorder and some of the better is explained in considerable detail in the recorder then connects to the system via cassette decks. instruction manual for the Model 128. It jacks located on the rear apron of the During playback, the Model 128 acts is worth noting that "encode" and "de- Model 128. In operation, the Model 128 as an expander whose slope comple- code" frequency response characteris-
JANUARY 1978 31
AmericanRadioHistory.Com tics of the Model 128, in its noise reduc- trol near it operates in conjunction with mon weakness of expanders). The en- tion mode, are far from "flat." About 10 amber and red LED's on the panel to set tire operation was so noncritical that, in dB of high -frequency preemphasis is the level at which the device goes from most cases, one would not be con- used during recording and a corre- expansion to compression. The en- cerned unduly about the actual signal sponding deemphasis during playback hancement circuit can also be set to go levels, or when the threshold lights were to further reduce the modulation noise into operation above a certain signal lev- flashing. (Although out of habit, we tried that accompanies the action of the dbx el (as set by the LEVEL control) instead to keep them flashing on normal pro- processor. of operating over the full dynamic range gram variations.) The second function of the dbx 128 is of the instrument. Pressing the button As a noise reducer, the Model 128 as a dynamic range enhancer, or vol- changes the mode from linear to "above was at its best. The magnitude of the ume expander. This is done with a sepa- threshold" so that the dbx system be- compression during recording can be rate expansion channel, usable simul- comes a peak unlimiter or a peak com- appreciated by listening to the program taneously with the noise reducer or by it- pressor, according to one's needs. Pro- off the tape while recording. It is incred- self when playing ordinary disc or FM ra- gram levels are unaffected when the ibly noisy and shrill. When the same pro- dio programs. Actually, the enhancer amber LED is on. gram is played back through the PLAY channel can be continuously varied from The remaining controls include a pow- mode, however, one would never guess full ("infinite") compression to an expan- er switch, a tape playback level match- that it ever had been in compressed sion slope of 2.0, although compression ing control, and an input selector button form. It sounded exactly like the original is not likely to be used except for such labelled TAPE and Disc. The latter posi- program, in every respect, without an purposes as background music or tion bypasses all the tape recorder cir- audible hint of processing. accommodating the wide range of signal cuits to permit the enhancement circuits With a cassette recorder, the Model levels that usually exist during a confer- to operate on the program coming from 128 makes it possible to record at a low ence or meeting. As the control knob is the associated amplifier or receiver. The level (as low as -20 dB, hardly moving advanced through a slope of 1.0 (linear), DISC nomenclature applies to the playing the recorder meter pointers), thus avoid- the most prominent effect is usually the of dbx-encoded phonograph records, of ing the usual problems with high -fre- change in background noise, which which there are a few, through the de- quency tape saturation. Yet, during play- drops markedly during expansion. With coding circuits of the Model 128. back, the S/N ratio is at least as good as an expansion slope of 1.2 or 1.3, it is with normal operation of the machine. possible to realize a worthwhile noise re- Laboratory Measurements. The Although Dolby noise reduction can be duction on most programs, without ob- dynamic nature of the dbx Model 128 used with the Model 128, dbx points out jectionable side effects, and with a cor- range enhancer makes it impractical to that it offers no advantage, and should responding enhancement of the pro- make quantitative performance mea- be switched off when one is making a gram dynamics. surements. Except for verifying the dbx recording. The basic operation of the dbx 128 is deemphasis and preemphasis curves A drawback of the dbx system is its in- controlled by six pushbutton switches, and the complementary nature of the re- compatibility with other noise -reduction three of which are for the noise -reduc- cording and playback slopes, we eval- systems, such as the omnipresent Dolby tion functions during tape recording. The uated the system's performance entirely and ANRS, or with no system at all. A GYP (bypass) button routes the tape re- by actual use. dbx recording must be played back corder signals around the dbx circuits; through a dbx decoder since it is unlis- REC switches in the compressor (with a User Comment. In spite of its small tenable in its encoded form. The same 2.0 slope) between the program and the size and accessory nature, the Model applies to dbx phonograph discs; they recorder's input, with the high -frequency 128 is a formidable unit to master. The have an unbelievable dynamic range preemphasis added; and PLAY places user's manual is very complete (almost when properly played, but cannot be lis- the dbx circuits in the recorder's play- too complete, in some respects), but it is tened to without a dbx decoder. More- back path with high -frequency deem- not easy reading. Our recommendation over, the Model 128 does not provide phasis and in a 2.0 expander mode. is that it be studied like a textbook on dy- the ability to monitor a program off the The two enhancement buttons are la- namic signal processing, which it very tape while recording. (It has only one set belled PRE and POST and refer to the po- nearly is, and that the Model 128 be set of circuits. The reasons for making the sition of the variable compander circuit up in a system and the controls experi- Model 128 in this way are obvious when relative to the tape noise reduction cir- mented with until one has a fairly clear one considers its price, even without the cuit. PRE allows the program to be ex- idea of what is happening when any par- duplication of facilities required.) panded or compressed before it is re- ticular control configuration is used. Aside from the foregoing, and likely corded, while POST makes these opera- The SLOPE control must be set to 1.0 more important to serious recordists, the tions possible on the playback signal (in when noise reduction is in use. Other- Model 128 is perhaps the most effective both cases, independent of the action of wise, the input and output signal rela- and versatile tape recording noise re- the noise reducer). With proper use of tionships will be altered. The control has ducer and dynamic range enhancer this feature, the Model 128 actually no detent or definite center position but available to the amateur recordist or hi-fi makes it possible to improve the quality appears to be accurately calibrated. enthusiast. Aside from the considerable of a tape recording, relative to the origi- With a slope of about 1.2, the expand- practice needed to become familiar with nal signal, instead of merely not adding er was very effective in reducing back- its operating modes, it is a virtually fool- any more noise to it. ground hiss from phonograph records proof product and is outstandingly free A control knob to the left of the en- and FM tuners, with a light enhance- of the undesirable side effects that often hancement buttons permits the com- ment of dynamic range and almost nev- accompany such signal processing. pander slope to be varied. A LEVEL con- er any signs of noise "pumping" (a corn- CIRCLE NO. 103 ON FREE INFORMATION CARD
32 . POPULAR ELECTRONICS
AmericanRadioHistory.Com Popular Electronics' JANUARY 1978 e e I 7: SPAC E WAR - t:oflc. e =TEST 1 Fle es CI 1 n 3'3. a
A host of video and nonvideo using micro- T.V. SCHOOL HOUSE electronic games, many I processors, promises the public more stimulating fun for leisure time.
BY KRIS JENSEN
ACOUPLE of years ago, an elec- non -TV games are coming on strong, tronic video game consisted of a too. With figures like these, integrated - simple "black box" that, when connect- circuit chip suppliers such as General In- ed to a TV receiver, produced little more struments, Texas Instruments, National than some version of video table tennis. Semiconductor', and Rockwell are hard In some cases today, that black box is pressed just to keep up with anticipated virtually a persdnal computer. Now there demands. T.V. CASINO I are games whose color images try your BLACKJACK gambling instincts at blackjack, your Then and Now. Ataci got the video- "destroy" capability against an enemy garre ball rolling across TV screens in a tank, your patience and fortitude through big way in 1975 with its "Pong" game, a Only after you've a maze while a "cat" attempts to devour hit -the -ball with a paddle game that fea- `W1 you, your artistic talent with computer - tured automatic on -screen digital scor- the sheer drawn pictures, or your knowledge of ing. "Super Pong" followed, offering four experienced math and history. And that is just the be- resident games-two forms of tennis, joy slaughtering ginning in video games! Catch, and Robot, all in full color with of Furthermore, there are nonvideo automatic scoring and sound effects. A your best friend will games-a new breed of electronic batt- host of other companies shared the suc- legrounds emerging from game manu- cess in this market, including Coleco you know the true facturers who were never in the elec- and Magnavox, among leaders of"dedi- tronics business. Traditional game man- cated" games. meaning of fun.' ufacturers like Parker Brothers (of Mo- Now these games are commonplace.' , nopolyTM fame), Milton Bradley, Mattel Prices have dropped considerably-to Toys, and others now offer nonvideo as low 'as $19.95. Moreover, there are hand-held or table -top electronic games. many more game variations available in Consequently, these manufacturers á number of 1977-1978 models. Atari, blithely sidestepped the FCC and the as an example, has dropped its former
production delays caused by Class I in- line and introduced "Ultra 'Pong," with terference tests. 16 color -game variations selling for 40% The Electronic Industries Association less than last year's more limited "Super estimates that some 3.5 -million video Pong." National Semiconductor's "Ad- games were sold last year. The figure versary 370" -introduced last year as a for this year is expected to reach 10 mil- tennis -hockey -handball game-has been lion-and that is for video games alone; joined by the company's new "Ad -
BOWLING 33 Courtesy RCA AmericanRadioHistory.Com versary 600," which has 12 action fields stored in the machine's F8 microproces- accompanied by manuals to answer and 23 games that include "Pinball" and sor. These games are disabled when a questions randomly selected by the Stu- "Wipeout" (with 240 stationary targets) VideocartTM is inserted. There are 15 dio Ii computer. The faster the correct games as well as some of the traditional different cartridges available at this writ- answer is selected and entered on the paddlb-ball games. It uses NS's ing, including "Baseball," "Desert Fox" keyboard, the higher the score regis- .MM57106 game chip, combined with an (a tank battle game), "Shooting Gal- tered on the TV screen. The console is LM1889 Modulator IC to produce full lery," "Math Quiz," and an introduction priced at $149.95, and cartridge prices color, audio and r -f signals. Magnavox's to "Backgammon." Thé machine is range from $14.95 to $19.95 each, de- "Odyssey 4000" has eight full -color priced at $169.95, while each game car- pending on contents. games with remote, hand-held joysticks. tridge is listed at $19.95. The RCA Studio Il game is based on Unlike most other paddle -ball games, The baseball game may be cited as the CDP1802, the same 8 -bit chip used users can move on -screen players in an example of the degree of sophistica- in the POPULAR ELECTRONICS "Elf" mi- horizontal as well as vertical directions. tion that microprocessor games can crocomputer, as well as the black -and - In addition, an "Odyssey 5000," with achieve. Here, a "green" team plays white graphics chip. In addition, inside many more built-in games, is expected nine innings against a "blue" team. The the machine are two 512 x 8 -bit ROM's. to be marketed. player whose team is in the field can They act as an ."interpreter" to provide There are also video games that do control the positioning of Outfielders in common game -display patterns such as not feature paddle -ball formats. For ex- order to "catch" the ball hit by the batter. scorekéeping, alphanumerics and sub- ample, Atari has debuted a $79.95 'Furthermore, he can pitch á fast ball, let- routines. A second ROM contains pro- "Video Pinball" game, a tank battle up ball, slow ball, and -curve ball in any gramming to execute any of five resident game, and a "Stunt Cycle" game. direction. Balls, strikes, outs and runs games. TV refresh (direct -memory ac- Most games provide a host of devices register on screen. Hit the batter and a cess or DMA is used); and stack and to make them more interesting, such as figure on the screen goes to first base. variable storage are provided by 512 different paddle sizes, choice of ball The score is automatically maintained bytes of RAM. speeds, etc. An interesting innovation on screen, of course. Clearly, the chal- Atari's new $189.95 "Video Computer this year on a few games is indenting the lenge of outfoxing one's opponent System" comes with one plug-in car- hockey -goal areas so thát the puck can makes the enjoyment of a game last that tridge that provides 27 game variations rebound behind the goal, as in the real - much longer. with full -color capability, including a life sport. The major consideration here Following on the heels of Fairchild's combat package of "Tank" and "Jet is to minimize eventual boredom. But a programmable video game was RCA Fighter." The latter game provides new generation of video games will with its "Studio 11 Home TV Program- steerable and nonsteéráble missiles, surely overcome this possibility: pro- mer." Whereas Fairchild's game has re- cloud formations and multiple fighter grammable video games. mote controls, RCA's features two cal- versus bomber combinations. The sys- culator -type keyboards on the console, tem includes two joystick controls, four Programmable Video Games. which measures 15" long x 7" wide x 2" detachable paddle controls and a player Fairchild Camera and Instrument broke deep. There are five resident games: difficulty option switch. Five additional the ice on programmable video games Bowling, Freeway, Addition, Doodle, cartridges are currently available, offer- at the end of 1976 with its "Video Enter- and Patterns. Plug-in cartridges, of ing 10 to 50 game variations each. They tainment System." Based on a repro- which there are currently six, also con- include "Space Mission," "Air-Sea Bat- grammable microcomputer chip set, it sist of ROM's that plug into a socket. tle," "Street Racer," "Indy 500" and spearheaded the format used by other Built-in games are then disabled; play- "Video Olympics." manufacturers of programmable games. ers continue to control new games via Bally, well known for its arcade Here, one inserts what appears to be a the front -panel keyboards. Among the games, has eritered the consumer elec- tape cartridge (actually it's a solid-state plug-in cartridge games available are tronics market with a programmable circuit that contains game programs on baseball, space war, and "TV School video game called, "Professional Ar- ROM) into a slot on the game machine House" (social studies and mathematics cade." The model has two on -board to select a particular game or games in quizzes). The latter has a Yellow Series games called "Gunfight" and "Check- full color if played on a color TV receiver. for elementary students and an Orange mate," with controls for up to four play- Hockey and tennis are resident games Series for advanced students. Both are ers. In addition, it incorporates a 4-func-
p - r '4
Electronics (assembled by Rockwell Milton Bradley's nonvideo "Comp IV" In Fidelity Electronics?"Chess International) for Mattel, Inc.'s bselects one of 32,000 random-number - Challenger," moves are entered a"Auto Race" include PPS -4/1 micro- combinations when turned on. The via keyboard. Display indicates player/ computer and segmented LED matrix.. players then tryyto guess number. -machine moves and game outcome.
Microphotograph of Texas instruments' Studio II, RCA's TV programmer, TMS-1000. microprocessor. It can be da has live built-in games and also M tailored to fit any number of games uses optional plug-in cartridges
and has direct drive for displays._ for other types of programs. "
34 POPULAR ELECTRONICS
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AmericanRadioHistory.Com C ID, you get ele trouics career flea!' 'mg 1)ecial!sts. If you're interested in learning how to fix air conditioners, service cars or install heating systems - talk to some other school. But if you're serious about electronics, come to CIE -The Electronics Specialists.
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.1717 -ow% . 4 Special Projects Director Cleveland Institute of Electronics
AmericanRadioHistory.Com Plus there's a professional quality the exams get their Licenses. You My father always told me that oscilloscope you build and use to may already know that an FCC there were certain advan- "see" and "read" the characteristic License is needed for some careers tages to putting all your eggs in one waveform patterns of electronic in electronics - and it can be a basket. "John," he said, "learn to equipment. valuable credential anytime. do one important thing better than anyone else, and you'll always be You work with experi- Find out more: Mail this in demand." enced specialists. card for your FREE I believe he was right. Today is When you send us a completed CATALOG today: the age of specialization. And I lesson, you can be sure it will be If the card is gone, cut out and think that's a very good thing. reviewed and graded by a trained mail the coupon. Consider doctors. You wouldn't electronics instructor, backed by a I'll send you a copy of CIE's expect your family doctor to perform team of technical specialists. If you FREE school catalog, along with a open heart surgery or your dentist to need specialized help, you get it fast complete package of independent set a broken bone, either. Would you? ... in writing from the faculty spe- home study information. For these things, you'd want a cialists best qualified to handle For your convenience, I'll try to specialist. And you'd trust him. Be- your question. arrange for a CIE representative to cause you'd know if he weren't any People who have known contact you to answer any questions good, he'd be out of business. us a long time, think of us you may have. Why trust your education Remember, if you are serious as the "FCC License about learning electronics ... or and career future to School." building upon your present skills, anything less than a We don't mind. We have a fine your best bet is to go with the elec- specialist? record of preparing people to take .. . tronics specialists-CIE. Mail the You shouldn't. And you certainly and pass... the government - card or coupon today or write CIE don't have to. administered FCC License exams. (and mention the name and date of FACT: CIE is the largest inde- In fact, in continuing surveys nearly this magazine ), 1776 East 17th pendent home study school in the 4 out of 5 of our graduates who take Street, Cleveland, Ohio 44114. world that specializes exclusively in electronics. We have to be good at it because we put all our eggs in one basket: electronics. If we hadn't done a good job, we'd have closed our doors long ago. Specialists aren't for everyone. I'll tell it to you straight. If you think electronics would make a nice hobby, check with other schools. But if you think you have the :ool - and want the training it takes -to make sure that a sound blackout V2k__- - during a prime time TV show will be e corrected in seconds-then answer _ IL 4; '.- - this ad. You'll probably find CIE has _ . .v - -_--, a course that's just right for you! At CIE, we combine theory and practice. You c*r141 learn the best of both. Learning electronics is a lot more than memorizing a laundry list of facts about circuits and transis- tors. Electronics is interesting be- cause it's based on some fairly recent Patterns shown on TV and oscilloscope screens are simulated. scientific discoveries. It's built on ideas. So, look for a program that starts with ideas- and builds III I on them. That's what happens with CIE's CIECleveland Institute of Electronics, Inc. Auto -Programmed® Lessons. Each Ohio 44114 lesson uses world-famous 1776 East 17th Street, Cleveland, "programmed learning" methods to Accredited Member National Home Study Council You teach you important principles. YES. John, I want to learn from the specialists in electronics-CIE. explore them, master them com- Send me my FREE CIE school catalog - including details about troubleshooting pletely... before you start to courses- plus my FREE package of home study information. PE -50 apply them! But beyond theory, some of our Print Name courses come fully equipped with II Address Apt the electronics gear to actually let you perform hundreds of checking, City testing and analyzing projects. State 7ip In fact, depending on the course you take, you'll do most of the basic Age -.Phone (area code) things professionals do every day- things like servicing a beauty of a Check box for G. I. Bill information: El Veteran Active Duty Zenith color TN set ... or studying a Mail today: variety of screen display patterns , with the help of a color bar generator.
AmericanRadioHistory.Com tion, 10 printing -memory calculator with at this writing, while other cartridges ing the value of a microprocessor for a screen display, entry correction and (unannounced) will be priced at $20. nonvideo games. A TI system is also the scroll button. A cassette mode permits integral component in "Code Name: plugging in "Videocade" electronic pro- No TV Needed. Games that do not re- Sector," a submarine pursuit game from grams, which consist of an Action/Skill quire a TV receiver have begun to enter Parker Brothers. This game is truly chal- series, a Sports series, an Educational the electronic -game market in force. Mil- lenging. Two opponents compete series, and a Strategy This ton series. pro- Bradley, for example, has introduced against each other, each commanding a grammable machine also features mu- a hand-held game incorporating a mi- destroyer in an effort to sink a computer- sic. For example, in "Gunfight," the user croprocessor, called "Comp IV." When controlled sub as it moves through 4800 operates the movable arm the of a comput- $30 game is first switched on, it se- possible sections of a nautical -chart er -generated "cowboy" to aim and fire at lects one of 32,000 random -number board. Seven -segment and dis- an opponent-assuming he is not hiding combinations. By using the keyboard, a crete -LED displays indicate speed, behind a movable cactus. If the player player enters his number guesses. depth, range, and headings (directions) "Kills" the opponent, the latter dies on LEDs display how close the player's as opponents try to blow the sub out of the screen to the sounds of "Taps" and guesses are to the game -selected num- the water. Collisions can occur to throw "The Funeral March." The Arcade is ber. The idea is to logically deduce the a player off course, and if a player priced at about $290, while cassettes numbers and their order in as few tries misses the sub, the underwater craft not are $20 each. At this writing, the model as possible. only moves on a secret course, it will fire is awaiting FCC type approval. Comp IV can be programmed to oper- back to put the attacker in a random po- Coleco Industries, Inc. also has an ate with three, four, or five number sition out of firing range. "Arcade" programmable game on the strings to make the game as easy or as Though "Code Name: Sector's" in- market. It's called, "Telstar Arcade," and simple as one likes. structions are stored in ROM, a RAM, features a three -sided console. One This MB game is built on a single system is used to temporarily store infor- side has a built-in car steering wheel board that utilizes a multikey keyboard mation on ship positions, compass that acts as an input controller for auto and a TI 970 game chip. (The 970 is ac- headings, and speeds. Decoding for the racing games, another a pistol and hol- tually part of the new Texas Instruments displays is accomplished with a pro- ster for target and shooting games, and TMS1000 series of p -channel MOS four - grammable logic array for conversions the third a set of knobs for paddle games bit microprocessors. During its manufac- from BCD (binary coded decimal) to such as tennis, hockey, etc. Games are ture, however, a masking technique is seven -segment format. A Klixon key- determined by the programmed Telstar used to program an on -board 1-k ROM board from TI is used to input informa- cartridge used, which is triangular in that tailors the TMS-1000 to fit a custom- tion such as speed, steering, sonar con- shape. The unit comes with a cartridge er's requirements in software and allows trol, etc. The entire system operates on that contains programming for three direct -drive for displays. The chip also a single 9 -volt battery. It's priced at $40. games: "Road Race," "Quick Draw" supports 256 bits of RAM and an arith- Mattel Electronics has also come up and "Tennis." The console with one car- metic unit.) with some innovative ideas on three tridge is priced between $100 and $125 Milton Bradley was not alone in see- pocket-size electronic games called
PIN CONFIGURATION 28 LEAD DUAL IN LINE
Top Vie
Va: 28 Background Right Player Video 27 Blanking Left Player Video 26 Explosion Envelope Tank 1 Strobe 25 Gunfire Envelope Left Track Forward 2e Tank 2 Strobe Right Track Forward 23 Tank 2 Motor Sound Right Track Reverse 22 Bearing Squeak Left Rave Se Track 21 Tank 1 Motor Sound Fire Gun In 20 Explosion end Gunfire Noise Game Reset Clock Input (4.09MHx) Test Test -Do not connect Test Do not connect Sync Test Color Burst Locator Test Voc Above is pin configuration for General Instrument's AY -3-8700 single -chip tank game. It provides 32 rotational angles of tank control and also has noise outputs.
Video screen (left) using GI's AY -3-8600 hockey game chip has two new provisions: lateral as well as vertical movement of forwards and space behind goal for puck to bounce off the wall instead of disappearing.
40 POPULAR ELECTRONICS
AmericanRadioHistory.Com "Football," "Auto Race" and "Missile At- MORE VIDEO GAMES tack." A LED array marks a player's po- sition on the football field as he attempts to avoid other LED "tacklers" that are controlled by the game's electronics package. Seven -segment displays keep The Atari Video Computer time, and yardage to go. track of downs, System uses plug-in game If a player scores a touchdown, the cartridges, has two joy -stick game plays the tune "Charge!" controls, and includes a In playing "Auto Race," you are racing difficulty option switch. around a four -lap LED -lighted course.
Steering and speed/shift controls allow (DI imrbot' I you to maneuver around opponent cars 1031p0c. under the game's control. While playing, ªz motor sounds are produced. You hear a beep to indicate a collision; a victory sound when and if you beat the seven - - .'*'+; segment clock through the course. In "Missile," a LED array indicates hand controllers that enemy missiles are launched to- CHANNEL F /71/N(1//(0 NOW FN1FAlANFNI SYSlE1, ward your "city." The object of the game is to use your anti -missile missiles to de- console stroy the enemy missiles before they 0111111h1 reach home turf. A seven -segment dis- play keeps track of your "kills," but make one mistake, letting an enemy missile INPUT F8 CARTRIDGE PSU through, and the game plays "Taps" just F8 INTERNAL CPU active only after your city is destroyed. PSU (central when (programmable processing Videocart The display is what makes the Mattel storage unit) unit) inserted games unique. It is a cross between a OUTPUT hand-held calculator number display r and a true video display, minus the Block diagram of Fairchild video. Designed by Rockwell Interna- R F Camera and Instrument's "Video INTERFACE tional, it consists of a matrix of 40 x 10 Entertainment System," based mil GaAs LED's. Three columns of sev- on a reprogrammable en vertical line segments make up the microcomputer chip set. Auto Race and Missile Attack displays, while three rows of nine horizontal seg- TV .fa ments make up the display for the Foot- o...... o ball field runners. All multiplexing and buffering is accomplished with Rock- well's PPS -4/1 microprocessor. This dedicated chip contains all the software for all three Mattel games. Cost of these is $29.95 for Football, $24.95 each for Auto Race and Missile Attack. e Arcade" from Coleco Rockwell is also responsible for the "Telstar Industries, Inc., includes design of another system, sold by Uni- "Road Race," "Quick Draw," sonic. Called the "Unisonic 21," it is a and "Tennis" on one console. Blackjack card game that comes in both shirt -pocket and desk -top models. If you would like to calculate your odds before picking up the next electronic "card," you can flip a switch that converts the game into an eight -digit, four -function
. calculator. Taking its game more seriously, Fidel- ity Electronics has developed the "Chess Challenger." It uses four al- Bally's "Professional with phanumeric displays and a keyboard. Arcade" two on -board games has Moves are entered via the keyboard and 4 -function, 10 -memory lat- shown on the displays. Two seconds printing calculator er, the display indicates the machine's with screen display. move. An average player will win 25% to
JANUARY 1978 . i
AmericanRadioHistory.Com MEMORY
VARIABLES RAM 512 BYTES TV CHIP VIDEO MODU- TV AND DISPLAY (4-2101) (1861) LATOR RECEIVER ROM 1024 BYTES GAMES (2-1831) Block diagram of RCA's Studio II programmer is shown at left. Photo INTERPRETER ROM 1024 BYTES (2-1831) CLOCK of the game's pc board is below. { osc. It uses the COSMAC CD -1802 MPU, as in the 8 INT, Elf microcomputer. DMA, AND Two keyboards are provided for FLAG*4 FLAG *1 players to enter COSMAC instructions, MICROPROCESSOR answers or strategies. FLAG* 3 (1802)
4 TO 16 DECODER (4515) TEN LINES A 7
1 2 3 I 2 3 . 4 5 6 4 5 6 7 8 9 7 8 9 ' a 0 r r'. 'KEYBOARDS
, r ,fi ilíU`..J
70% of the time in which case, a LED la- respond, are for the chess -by -mail ad- to allow two opponents to challenge belled "I LOSE" indicates the machine's dict only. each other while competing against the defeat. With the "Chess Challenger," Yet another computerized chess machine. The COPS series includes you move real chess pieces around a game-"Boris" from Applied Con- two single -chip microprocessors, the real chess board. (The chess board cepts-is a $299.95 machine designed MM5799 and MM57140, 8 or 16 k of does not use the standard chess -square with both beginner and advanced chess ROM, 1 k of RAM, and other IC's, includ- identifier terminology. Instead, the ter- players in mind. It features a program- ing a printer interface chip. minology is unique to the computer logic mable starting position, handicapping, The hand-held game, as a teaching system around which the game is built.) en passant, castling, automatic queen- aid for 'children, could prove an impor- "Chess Challenger" employs a stand- ing, editing capabilities, timer, and an 8 - tant tool in child education. Other manu- ard 8080 microprocessor chip, a ROM digit alphanumeric readout. The com- facturers, such as Texas Instruments system for strategy storage, and a RAM puter concedes defeat.by flashing "Con- and APF, are also beginning to produce system for game moves. The game sells gratulations" on the display. such games. for $200 (Heath sells it for $179.95, as- The increasingly , popular game of sembled), and for an extra $75, it can be Backgammon has not been neglected, Still Many More. The number of man- reprogrammed (another ROM installed) either. "Gammonmaster II" by Trycom ufacturers who produce electronic for tournament strength. The upgraded Inc. and "Computer Backgammon" by games seems endless, thanks to a version begins a game by asking at Texas Micro Games, Inc. havé both steady stream of totally new chips being which level you would like to play. You been announced and exhibited át offered as off -the -shelf items.to them. TI; can begin at level 1 and, as you become shows. In both cases, the computer is a for instance, has Space War, from its more proficient, work up to level 3. real thinking machine, being required to new line of game chips: GI has its The game level approach is also used analyze the entire board before making "Gemini TV Games" IC's, which include by Staid's "Compuchess," another its move against its human opponent. cassette -programmable IC's designed chess game recently introduced. The National Semiconductor has not con- around a CP1600 microprocessor and a $159.95 hand-held game requires you fined itself to the pure video game mar- system instruction ROM (2048 x 10 bit). to supply the chess board. It can be pro- ket. Based on its calculator -oriented With appropriate RAM's and .graphics grammed for up to six different skill lev- processor system (COPS), NS has processor chips, games such as "Road - els. Levels '1 and 2 are for teaching pur- three versions of a learning game called race," "Submarine," "Dogfight," and poses; levels 3 to 5 are for players al- QuizKid. The hand-held games present "Blackjack" -can be generated. ready familiar with the game. Because math problems of varying complexity The most widely used GI chips em- of all the algorithms performed at level 5, and require answers within preset time ployed by game makers are the 8500 it takes the game nearly seven hours to limits. The latest QuizKid Racer game and second -generation 8550 n -channel respond to your move. Hence, levels 5 can operate as a single unit, or it can be MOS devices. With just a few outboard and 6, which require a couple of days to linked by a cable to another Racer game components, these chips can provide
42 POPULAR ELECTRONICS
AmericanRadioHistory.Com tennis, hockey, handball, practice, and two target games, the last with remote MORE NONVIDEO GAMES guns. On -screen scoring with sound ef- fects are generated by the chips, as are color outputs for use with a color -gener- ator circuit. It is this flexibility that has made the GI chips so attractive with such manufacturers as Magnavox, Lloyd's, Monteverdi, Venturi, Hanimex, etc. Simply jumpering or switching cer- tain pins of the 28 -pin IC adds as much complexity (and cost) to the final product as desired. Speaking at last year's winter Con- sumer Electronics Show, Dr. E.A. Sack, Vice President for GI, stated that his company believes in the dedicated ap- proach to microprocessor game de- signs. GI backed up this position by in- troducing its Gemini video game circuits that are capable of playing more than 50 different games. While some of the new ti chips allow a manufacturer to make Three nonvideo games, clockwise stand-alone games that can be repro- from above: Parker Brothers' mae®®m®}óóooó!\\\'.1 .2> 9) grammed, others can be added to exist- "Code Name: Sector,"a micro- 0,_ : - ing games that use the GI 8600 eight - processor -based sub pursuit game; game chip (tennis, hockey, soccer, National Semiconductor's "Quiz Kid" n calculator; and Texas Micro , practice, gridball, basketball, squash, Backgammon." and basketball practice). Using much of Games' "Computer the 8699's video and player -control cir- cuits and adding an 8603 chip, for exam- ple, the normal ball -type games can be ers, score, blanking, background, sync, Even though game manufacturers are transformed into a road race when game and color -burst locator. Audio output cir- now designing games for the home, of- is the number 1 is selected on the control cuitry is just as complete with tank -1 and fice, and shirt pocket, this just be- switch. The idea, of course, is to allow a tank -2 motor sounds, bearing and track ginning of a whole new era of games- manufacturer to upgrade his entire stock squeals, and explosion and gun -fire en- manship. Datatime Corp. may be saying easily and relatively inexpensively sim- velopes. The chips are $9.95 each, but this with its new wristwatch, which gives ply by adding one IC chip. don't send in an order unless it is for time and date on a liquid -crystal display GI has just recently begun delivery of 50,000 or more chips. as well as allowing you to play Jackpot, its AY -3-8700 single -chip tank game. Among other companies in the elec- Dive, and Roulette. A backlighted dis- This is a 28 -pin IC package that pro- tronic game business, APF Electronics play on the $100 timepiece keeps you in vides 32 rotational angles of tank control has a broad line of video paddle games action no matter what the hour. for two players. Video outputs from the with two new additions-the Model 500 Too, let us not overlook the home chip include left and right player tanks, with 20 space -type games, including computer while we're exploring electron- shells, shell bursts, mines, fixed barri- Space War, and an M1000 microproces- ic games. Though computers are at the sor programmable game at $149.95. peak of the triangle in terms of numbers Sears, too, has increased its line of expected to be sold this year (owing to MicrocoInpaters like Radio Shack's games, which begins at $20 and goes higher costs), a myriad of fun games can TRS-80 can be used to play video on up to a sophisticated programmable be played on a TV screen if you have games or as tools. educational game that sells for $179.95 Sears' pro- your own computer. There are more gram library ranges from antiaircraft tor- possibilities, in fact, than any programm- pedo shooting to an outer -space game. able -type video game has because you ;h Mid -priced dedicated games are avail- can create your own game programs as able for other games like "Tank." well as having access to an overwhelm- Microelectronic Systems' "Interact" is ing amount of game software and writ- a joystick -and -keyboard -operated game ten programs. that can be programmed by a tape sys- In spite of predictions in numbers and tem. Running at 810 bits/inch, the tapes dollars for the future of electronic set up the game to play Trail Blazers, games, perhaps their real interest for all Blackjack, or Regatta racing. You can of us was best expressed by Nolan also draw computerized color pictures Bushnell, Chairman of Atari: "Only after on a TV screen. With a built-in cassette you've experienced the sheer joy of machine and alphanumeric keyboard in- slaughtering your best friend will you put, it lists for $249. know the true meaning of fun." O
JANUARY 1978 43
AmericanRadioHistory.Com soun
O..
PICK$R7NG .'fnCKER1NG,,. x3v /3n0o. 5,11~ 7(V.-15Jb2SE ;. .
Y
Match one to your equipment
"The right Pickering Cartridge for your equip- Pickering's new XSV/3000 is a remarkable de- ment is the best Cartridge money can buy." velopment. It possesses our trademarked Stereo- We've been saying that for years; and tens of thou- hedron Stylus Tip, designed to assure the least sands of consumers have profited by applying this record wear and the longest stylus life achievable principle in assembling their playback systems. in these times with a stereo cartridge. Its frequency If you have a fine manual turntable, the XSV/3000 response, is extraordinarily smooth and flat; its is a perfect choice. channel separation is exceptional; its transient re- If you have a high quality automatic turntable, sponse affords superb definition. It represents a then installing an XV -15/625E in its tone arm is a whole new concept of excellence in stereo perfect choice. cartridges. The summary advice of Stereo's Lab Test, in an Read the whole evaluation report. Send for your unusual dual product review, we think brilliantly tree copy of the Stereo "Lab Test" reprint; write to states our position: "The XV -15/625E offers per- Pickering & Co., Inc., formance per dollar; the XSV/3000, the higher ab- 101 Sunnyside Blvd., PICKERING solute performance level." That makes both of these FREE! Plainview, N.Y. 11803 cartridges best buys! Department p/}' 'for those who cen 1 ar the difference" PICKERING & CO., INC., COPYRIGHT 1977
44 CIRCLE NO. 36 ON FREE INFORMATION CARD POPULAR ELECTRONICS
AmericanRadioHistory.Com `\ ( 11;1/1/ l/// J BY RONALD W. REESE '__ . / ! I /
o
n a-
BUILD 'Charge. 05)
A digital electronic bugle -call generator with an audio amplifier for mobile or home use.
IF YOU have ever seen a Western tion-getting conversation piece. Two ously. The 7490 functions as a symmet- movie, you're no doubt familiar with controls allow the user to vary both the rical _ 10 counter in the following man- the bugle call played as the U.S. Cavalry tempo and pitch of the bugle call. ner. Input signals are routed to the inter- charges over the hill to the rescue. This nal =5 counter (pin 1). The output of this project generates that bugle call elec- About the Circuit. Free running tim- counter is connected to the input (pin tronically. Because digital circuitry es- er IC1 and its associated components 14) of the IC's =2 counter. Output sig- tablishes the musical intervals between (Fig. 1) form a tone oscillator whose op- nals appearing at pin 12 have a frequen- the notes, it will never drift out of tune. erating frequency is governed by the cy one -tenth that of the input and a duty "Charge!," as the project is called, can setting of R2. The oscillator output, a cycle of 50%. A =12 counter (1C3) is be built from readily available, inexpen- square wave with a duty cycle close to formed in a similar manner by intercon- sive TTL logic, 555 timer IC's, and sili- 50%, is frequency divided by factors of necting the =6 and =2 counters con- con transistors. 10, 12, and 15 by IC2, IC3, and IC4, re- tained in a 7492 IC. Two versions of the circuit are pre- spectively. In this way the three tones A different approach must be taken to sented. One, incorporating a high -power that form the bugle call melody are gen- realize a =15 function because 15 is not output stage, requires a 12 -volt dc sup- erated. Digital frequency division en- divisible by two and some other integer. ply and is well suited for use as a vehicle sures that the intervals between the In this project, a 74193 presettable up/ horn or a cheerleading device at pa- three notes remain constant. However, down counter is used as the =15 stage. rades and school sporting events. The the pitch of the bugle call can be varied This counter IC has four data inputs low -power version, operated from the ac by adjusting R2. (pins 15, 1, 10 and 9) and four corre- line, can be used as an annunciator, Square waves from IC1 are applied to sponding outputs (pins 3, 2, 6 and 7). doorbell, alarm, or simply as an atten- the three frequency dividers simultane- The counter outputs can be preset to JANUARY 1978 45
AmericanRadioHistory.Com Fig. 1. Schematic > diagram of "Charge!" Tempo and musical notes Tft -7- of the bugle call are generated digitally.
PARTS LIST
CI -0.001-11F disc ceramic capacitor 1 C2, C5 -0.1-µF disc ceramic capacitor C3 -22-µF, 16-V electrolytic capacitor 1 C4-I-1.LF, 16-V electrolytic capacitor C6 -0.0047-µF disc ceramic capacitor C7 -220-µF, 16-V electrolytic capacitor C8 -10-µF, 16-V electrolytic capacitor m m Ñ 1N- v11 r N+m1o -11." 1.m ICI , IC7-NE555 timer IC2-SN7490 decade counter IC3-SN7492 =12 counter IC4-SN74193 synchronous 4 -bit binary up/ down counter IC with preset inputs
IC5, IC9-SN74150 16 -line to I -line data se- lector/multiplexer IC6, IC8-SN7493 4 -bit binary counter ICIO-SN7402 quadruple 2 -input NOR gate ICI 1-LM340 5 -volt regulator
Q I ,Q2,Q4,Q5-Silicon npn power tab tran- sistor (GE D42C3 or equivalent) Q3, Q6-Silicon pnp power tab transistor (GE D43C3 or equivalent) The following are 1/4-W, 10% carbon resistors: R 1-4700 ohms 1L m = R3-47,000 ohms e R4,R6-1000 ohms m^' _U Áq R7-3300 ohms R8 ,R I3-470 ohms
R9,R 1 1-2200 ohms R2-I-megohm linear taper potentiometer R5 -25,000 -ohm linear taper potentiometer RIO,R12-l00-ohm, I -W, 10% carbon com- position resistor Sl-Spst 3 -ampere switch SPKR-8-ohm, 15-W weatherproof horn speaker Misc.-Printed circuit or perforated board, IC sockets, suitable enclosure, control knobs, heat sink (if necessary), heat sink paste, screw -type terminal strips, machine hard- ware, hookup wire, solder, etc.
form a four -bit binary number by apply- put (pin 4) while the count up input (pin put reaches 0000 (010) and the count ing four bits to the data inputs and 5) is at logic one, or count up if pulses down input falls to logic zero, a logic grounding the load input (pin 11) mo- are applied to the count up input while zero appears at pin 13, the borrow out- mentarily. When this is done, the four the count down input is at logic one. In put of the IC. bits applied to the inputs appear at the this application, the 74193 is used as a The logic zero at the borrow output in- outputs. down counter. It is loaded with the bi- dicates that 15 pulses from /C1 have After the load input returns to the logic nary number 1111 (1510), and is then been counted by /C and that the IC one state, the IC can count down if allowed to count down as pulses are re- must be preset again to 15 for the next pulses are applied to the count down in - ceived from ICI. When the counter out- counting cycle. By connecting all data 46 POPULAR ELECTRONICS
AmericanRadioHistory.Com inputs to the +5 -volt supply and the bor- +ev row output to the load input, the counter SPKR. R14 will automatically preset itself to 15 after eon it has counted down to zero. Square waves appearing at the O output of the R8 counter's D flip-flop (pin 7) are used as O 4708 042IC3 the output signal from this stage. The output of this flip-flop will be at logic one for seven pulses from IC1 and at logic zero for eight pulses. This results in a duty cycle of about 47%, which is rea- sonably close to 50%. LOW -POWER OUTPUT STAGE A sequential tone selector is formed PARTS LIST wirewound 5-W potentiometer by IC5, a 16 -line to 1 -line data selector/ R14 -50 -ohm SPKR-8-ohm, 5-W speaker multiplexer and IC6, a 7493 four -bit bi- Misc.-Hookup wire, small enclosure if from the gen- nary counter. Pulses beat Fig. 2. Output stage for speaker is mounted remotely, machine hard- erator, which will be discussed later, are the Low -power version. ware, terminal strip, solder, etc. counted by IC6 over the range 00002 to
11 1 12. The binary number generated by IC6 is applied to the data select inputs of rest, and then the next note is played, Input five (pin 3) of multiplexer IC9 is 105. As 106 counts upward, 105 sequen- followed by a longer rest. All notes are of connected to ground, so a logic one ap- tially selects signals from frequency di- the same duration-five beats. The pears at the multiplexer's output on the viders 1C2, IC3, and IC4. The three short rest separating the two notes form- sixth beat. This causes the outputs of tones produced by the counters appear ing a pair is one beat long. The longer IC1OA and IC10B to remain at logic zero at the data inputs of /C5 in the order in rest separating pairs of notes is five regardless of what is applied to the other which they appear in the bugle call. In beats long. Therefore, a total of 16 beats input of each gate. No signals can pass this way tones are selected and gated in is required by one pair of notes and two to the power amplifier during this inter- proper sequence for application to the rests (one short, one long). val, resulting in a one -beat rest. Inputs power amplifier. Binary counter IC8 will count 16 six through ten, pins 2, 1, 23, 22, and 21, The tempo at which the call is played pulses and automatically overflow to are connected to +5 volts. When IC9 is governed by the beat generator. This zero, providing a convenient way to de- selects input six, its output goes low, circuit also establishes the timing rela- termine the passage of 16 beats. The causing two things to happen. Decade tionships between the notes and rests, four binary outputs of the counter (pins counter IC6 counts up one pulse, allow- and supplies a clock signal to counter 12, 9, 8 and 11) are connected to the ing 105 to select the next note. Also, IC6 in the tone selector circuit. The beat four data select inputs of multiplexer NOR gates IC10A and IC108 pass sig- generator is formed by interconnecting 1C9. The data inputs of the multiplexer nals from the tone multiplexer to the IC7, a free -running 555 timer; IC8, a are connected to either +5 volts or power amplifier. The output of 1C9 re- 7493 four -bit binary counter, and IC9, a ground. The first five inputs (zero mains low through the tenth.beat.
74150 16 -line to 1 -line data selector/ through four, pins four through eight) are The last five inputs, 11 through 15 at multiplexer. The oscillating frequency of tied to the +5 -volt line. An internal NOR pins 16 through 20, are connected to IC7, determined by the setting of poten- gate is the multiplexer's output stage, so ground. This causes the output of IC9 to tiometer R5, sets the amount of time al- a logic zero appears at pin 10 (the multi- go high, disabling the power amplifier. lotted to each beat. plexer output) for the first five beats. By this time, two notes have been A repetitive beat can be used due to This allows NOR gates IC10A and played and the beat generator counter, the nature of the song. The notes ín the IC10B to pass an inverted version of the IC8, has overflowed to 0000 and the bugle call are played in pairs. That is, output signal at pin 10 of multiplexer in- beat sequence will repeat itself. The se- one note is played, followed by a short tegrated circuit 105. quence must be repeated eight times for
AUTOMATIC CUTOFF S1* Fig. 3. Auto -cutoff circuit with remote triggering switches. PARTS LIST POWER I 07 1C12-SN7474 dual D -type edge-triggered SOURCE 043C3 TO IC11 PIN1 flip-flop Q7-Silicon pnp power tab transistor (GE RIe IKn D43C3 or equivalent) Q8-2N2222 npn switching transistor TPINIC41 10% carbon composition re- 20 The following are RI8 sistors. 27011 TO ICIOC 2w PIN IO R 15-1000 ohms, 1/2W R16-220 ohms, 2 W + START R17-330 ohms, 'h W SWITCHES S l-Spst 3-A switch (optional) _2_ Misc.-Normally open momentary -contact IC socket, POWER pushbutton switches (optional), SOURCE heat sink, mica washer, heat sink paste, ma- -o- - PIN 3 *SEE TEXT chine hardware, hookup wire, solder, etc.
JANUARY 1978 47
AmericanRadioHistory.Com FI the low -power stage. This results in a 52 DI -D4 four -fold increase in output power. If you decide to employ the low -power +5V stage, be sure to connect the output of 117V AL multiplexer IC9 to the strobe input of multiplexer 105. When the strobe input is
GND high, the multiplexer output remains Fig. 4. Ac supply for low -power "Charge!" high no matter what logic levels appear at the data and data select inputs. A log- DI through D4 -1N4001 silicon rectifier di- LOW -POWER LINE -OPERATED ic zero at the strobe input of 105 allows SUPPLY ode Fl -1/ -ampere fuse the chip to pass signals (in inverted PARTS LIST S2-Spst I -ampere switch form) from the selected input to the out- C9 -500-µF, 25-V electrolytic capacitor Tl-I2.6-V, I -A filament transformer put. All other connections remain the same whether the high- or low -power all the notes to be selected and played. power switch S1 is closed. It will contin- output circuit is used. When all notes have been played, both ue to play the call until S1 is opened. beat generator counter IC8 and note se- This version of Charge! is suitable for Construction. Printed circuit, point- lector counter IC6 will overflow to 0000, use in a vehicle or as a cheerleading de- to-point, or Wire Wrap assembly tech- and the bugle call will repeat until power vice. However, if the unit is intended for niques can be used. Parts placement is is removed. An auto start circuit com- indoor use, the low -power output stage not critical. Wire Wrap sockets should prising 1C10C, R7 and C3 ensures that should be employed. (A line -powered be used with the IC's if this method of IC6 and IC8 start counting at 0000 when supply for the low -power version is duplicating the circuit is chosen. Wire no power is applied. . shown in Fig. 4.) smaller than No. 24 should be used for Transistors Q1 through 06 and resis- If Charge! is to be operated so that it all power supply and output stage con- tors R8 through R13 form the power am- plays the tune once after a momentary nections. Ali ground connections should plifier. The tone selected by IC5 is ap- switch (such as a doorbell switch or be made to one common point. plied to one input of IC108. The output magnetic door switch) closes, the auto- If Charge! is housed in a metallic utility of this gate provides base drive for Q4 matic cutoff circuit should be included. box, IC11 should be mounted on the en- and is also applied to one input of Either circuit option can be employed closure with thermal coupling through IC10A. Gate IC10A inverts and passes separately, or both used together. The heat sink paste. The utility box will then the signal to Q1 when the output of IC9 power supply shown in Fig. 4 can be connected to the circuit common or is low. When the square wave applied to accommodate the auto cutoff as well as ground. If desired, a small heat sink IC1OB goes low, the output of the gate the low -power output stage. approximately 1" x 1" (2.5 x 2.5 cm) with goes high, turning on transistors 04, 05, The auto cutoff circuit controls power '1" (1..3 -cm) fins can be used with IC11. and 06, which energize the speaker. to regulator 1C11. A momentary switch A heat sink is a necessity if the project is The logic one at IC1OB's output also closure latches the circuit on until the housed in a nonmetallic enclosure. produces a logic zero at the output of bugle call has been played in its entirety. Power switch Si, PITCH control R2, IC10A, cutting off transistors 01, Q2, If the "A" wiring is used, flip-flop IC12A and TEMPO potentiometer R5 can be and 03. will then toggle and turn off 08. This, in mounted at convenient spots on the en- When the output of IC108 goes low, turn, cuts off pass transistor 07. If the closure. The power switch must be able Q4, 05 and 06 are cut off, the output of "B" wiring is used, IC12A will not toggle to handle at least 3 amperes dc at 12 IC10A goes high, and Q1, 02, and Q3 until the bugle call has been played volts. If the automatic cutoff circuit is turn on. Current again flows through the twice. Of course, you can install an used, the 'momentary contact switches speaker, but in the opposite direction. SPDT switch to select either the "A" or should be rated for 50 mA, and, if pre- The transistors are, of course, turning on "B" connection. Similarly, you can con- ferred, S1 can be eliminated. and off at the audio frequency of the se- nect power switch S1 across Q7 to pro- For automotive applications, tap +12 lected tone. This arrangement is consid- vide a choice of either continuous or au- volts at a convenient point and route it to erably more complex than the more tomatic cutoff operation. the project's power input. (Screw -type commonly used switching circuits, but Transistors Q2 through 06 and resis- terminal strips mounted on the project provides much more output power. tors R9 through R13 are omitted in the enclosure simplify connections.) If the The amplifier draws current directly low -power output stage. Gate IC10A in- circuit is housed in a metallic enclosure, from the power source. The TTL inte- verts the tone square waves at the out- bolting it to the vehicle chassis will fur- grated circuits, however, require +5 put of multiplexer 1C9 and applies them nish a ground return. When connecting volts, which is provided by IC/ 1. to the base of Q1. When the output of a speaker to the audio output, note that IC10A is high, 01 conducts and current both sides of the speaker coil are float- Circuit Options. Your particular ap- flows through the speaker. Potentiome- ing. It's important, therefore, not to let plication might not require the high out- ter R14 functions as an output level con- one side of the speaker become inad- put power and/or continuous play capa- trol. When the output of IC10A is low, vertently grounded. Mount the speaker, bility of the circuit shown in Fig. 1. the transistor is cut off and the speaker which should be a horn -type transducer Therefore, a low -power output stage coil passes no current. Referring to the for outdoor use, in or on the vehicle at a (Fig. 2) and an automatic cutoff circuit previous description of the high -power suitable location. The box housing the (Fig. 3) are possible options. output stage, it can be seen that the av- circuitry should be installed so that the The manual cutoff,' high -power circuit erage current through the speaker is power switch, TEMPO and PITCH controls will start playing the bugle call each time doubled by that circuit as compared to can be easily reached. O
48 POPULAR ELECTRONICS
AmericanRadioHistory.Com ONLY a few years ago, the spectrum and duration, of pulses or signal level analyzer was an exotic, expensive, states are of greatest interest, making and relatively unknown test instrument the scope the logical tool for digital cir- to most people in the audio industry. By cuit analysis. The frequency analysis of contrast, spectrum analysis today is al- most complex digital signals would con- most a household word (albeit not al- vey little or no information about their ways fully understood) among audio de- timing. On the other hand, the scope is sign engineers, recording engineers, of little value in distortion analysis of lin- and technically minded hobbyists. ear systems (such as hi-fi amplifiers). The spectrum analyzer is, in the fre- Unless the distortion is severe, the test quency domain, what the oscilloscope is signal looks like a "perfect" sine wave in the time domain. As shown in Fig. 1 A, on the scope. The spectrum analyzer, a scope displays the signal amplitude as however, clearly resolves the distortion
1 The Spectrum Analyzer inHi-Fleasu rements
Frequency -domain instrument provides graphic solution of distortion products undetected by other means.
BY JULIAN HIRSCH ff
a function of time, which we know as the components, whose frequencies and waveform_ A laboratory -grade scope, amplitudes can be determined directly with its accurately calibrated time base from the display. and deflection sensitivity, can be consid- ered as a voltmeter with virtually instan- Types of Analyzers. Two basic taneous response, able to display and types of spectrum analyzers are used in measure signal voltage variations over audio measurements. The so-called
Ay any selected period of time from mi- real-time analyzer is widely used for croseconds to minutes. acoustic .measurements, since it is able Every signal also has a unique spec- to display the distribution of energy trum signature in the frequency domain throughout the entire audio spectrum. which can be broken down into one or The frequency content of a musical per- more different components whose am- formance or a recording can be plitudes and frequencies are related to analyzed as it takes place, hence the the amplitude and waveform of the sig- term "real time". nal (Fig. 1IB). Mathematically, there is a A real-time analyzer consists of a se- direct relationship, via the Fourier trans- ries of contiguous band-pass filters, form, between the amplitude and fre- whose cut-off slopes intersect at their quency characteristics of a signal, so -3 -dB response frequencies. The filter that the spectrum analyzer and oscillo- group usually covers the entire audio scope actually display the same infor- band of 20 to 20,000 Hz, and their out- mation in two very different ways. Each puts are normally displayed as vertical has its peculiar advantages and limita- lines on a cathode ray tube (CRT), the tions for revealing certain characteristics heights of the lines being proportional to of a signal. For example, in digital or the signal levels in the individual pass - pulse circuits, the time of occurrence, bands. The filter outputs are electroni-
49
AmericanRadioHistory.Com transient or nonrepetitive signals, and is most useful with continuous, or periodic signals-the types normally used in test- ing high-fidelity components.
Advantages of Spectrum Analyz- INPUT ers. The most common audio measure- ments (frequency and distortion) can be made with simpler, less expensive in- struments than spectrum analyzers. What unique advantages of spectrum Fig. 1. Scope analysis justify its considerable cost? display (A) shows Most often, the of wave amplitude speed measurement --{SPECTRUM is greatly increased. For example, a total with respect to ANALYZER time, while harmonic distortion (THD) measurement spectrum analyzer with a null -type distortion analyzer is (B) shows amplitude made by setting its controls for a refer- versus frequency. ence full-scale meter indication, then tuning it to the fundamental signal fre- quency and carefully nulling it out with the controls. Depending on the specific cally commutated rapidly enough to of a superheterodyne receiver as an r -f design of the instrument, this can re- avoid flickering a display. For certain device, but the principle is applicable to quire 30 seconds to 1 minute each time specialized applications such as moni- any frequency range. For example, a the frequency is changed (although toring programs at a recording console, low -frequency scanning (sweeping) some recent analyzers have automatic an array of light emitting diodes (LED's) spectrum analyzer typically uses a 100 - nulling that reduces measurement time
is sometimes used as an inexpensive kHz i -f with the oscillator sweeping from to a few seconds). substitute for a CRT display. 100 kHz to 150 kHz. Thus, input signals The distortion meter reading, known The individual filter bandwidths are from 0 to 50 kHz will be successively as the THD, includes all harmonics of typically a fixed percentage of their cen- heterodyned to the intermediate fre- the fundamental frequency, plus any ter frequencies (for example, 1/3 octave quency and displayed as "pips" on the noise, hum, and other spurious signals or 1/10 octave). For practical reasons, CRT. Scanning analyzers normally have that may be present. It does not distin- the "skirt" widths of the filters are quite a number of selectable, fixed i -f band- guish in any way between these several broad, so that lower -order harmonics widths that make it possible to resolve signals. Therefore, it is good practice to cannot be resolved. Also, the range of and measure individual frequency com- display the distortion products on an os- amplitudes that can be shown simul- ponents closely spaced in frequency. cilloscope, which gives a rough indica- taneously on the display is rather limit- Since only one filter is involved, as com- tion of the residual signal components ed, rarely exceeding 40 dB. These char- pared to the dozens employed in real- included in the THD measurement. In acteristics do not limit the application of time analyzers, the skirt selectivity of a the case of the best modern amplifiers, real-time analysis to acoustic measure- scanning analyzer can be made very whose distortion may be 80 to 90 dB be- ments, or other relatively broad -band sharp without incurring prohibitive ex- low the fundamental (0.01% to 0.003%), measurements. However, for circuit pense. the nulling process can be quite time measurements or performance testing, One might think that by simply sweep- consuming, and the oscilloscope usually in which the presence and levels of dis- ing the audio band at a rapid rate, com- shows that most of the "distortion" is re- tortion products or other spurious sig- parable to the commutation rate of a ally hum, hiss, or stray r -f pickup. A nals are of interest, the real-time analyz- real-time analyzer, a scanning analyzer somewhat similar situation exists when er lacks the frequency resolution (selec- could be used to make essentially "real- making FM tuner measurements, since tivity) and dynamic range to be a useful time" measurements. Unfortunately, the signal may contain appreciable tool. For such applications, a scanning electronic "laws" require that a high - amounts of 19- and 38 -kHz stereo sub - analyzer is used. resolution (narrow -band) analysis be carrier signals in addition to noise and The scanning spectrum analyzer, as made slowly. A finite time is required for distortion. In fact, meaningful measure- we still consider it, is basically a super- the output of a filter to reach its final val- ments of channel separation in most heterodyne receiver with a highly selec- ue after a signal is applied to its input, tuners cannot be made without some tive i -f amplifier, whose local oscillator is and with very sharp filters, this time can sort of filtering to remove these unwant- tuned automatically and repetitively be in the order of seconds. A frequency ed signal components which otherwise through a selected frequency range. As band must be swept at a rate that allows would mask the weaker signal crosstalk. signals are "tuned in", their amplitudes each component of interest to remain In contrast, a good spectrum analyzer are detected and used to deflect a CRT within the filter pass -band long enough shows the frequency and amplitude of beam vertically. The horizontal sawtooth for the full output level to be reached. each discrete frequency component, sweep ,voltage that deflects the CRT Even a relatively crude measurement clearly separated on the CRT display beam along its horizontal axis is also over the 20 -to -20,000 -Hz band requires (and usually in a single scan requiring used to sweep the oscillator frequency, about 1 second, and high -resolution only a second or two). All significant har- so that the horizontal axis becomes a scans, even over limited bands, may monic and intermodulation products can frequency scale. This is shown in Fig. 2. take many minutes. Thus, the scanning be readily identified and measured, Most of us are accustomed to thinking analyzer is poorly suited to measuring even in the presence of much stronger 50 POPULAR ELECTRONICS
AmericanRadioHistory.Com hum or noise signals. Since each har- al, it can be used in any situation where Using an Analyzer. At Hirsch -Houck monic is measured as "X dB" below the one would use an oscilloscope, since it Laboratories, we have recently acquired amplitude of the fundamental, it is nec- is capable of analyzing the same signal a Hewlett-Packard 3580A spectrum essary to convert the decibel readings to from a different viewpoint, so to speak. analyzer. This is one of the most percentages, and combine all significant By viewing the signal simultaneously on advanced scanning analyzers yet devel- readings by taking the square root of the a scope and an analyzer, the maximum oped for the low -frequency range from 5 sum of their squares, to obtain a true to- amount of information can be obtained Hz to 50 kHz. The 3580A has a digital tal harmonic distortion reading (less in a minimum time. tuning dial that sets the frequency corre- noise and hum, of course). With the aid It is possible, by a simple heterodyn- sponding to either the start (low end) or of a good scientific calculator, this is a ing process, to generate a constant am- the center of the swept range, anywhere simple and rapid procedure. plitude sine -wave signal at the exact fre- in íts 50 -kHz operating range. The A major advantage of the scanning quency to which the analyzer is tuned. sweep width can be set (in, steps having spectrum analyzer is its ability to dis- Sometimes this requires an accessory a 1,2,5 sequence) to values from 5 Hz to criminate against random noise. A THD instrument, but many spectrum analyz- 5 kHz per horizontal division of the dis- meter, or any other wide -band instru- ers now have this capability built-in. If play, or 50 Hz to 50 kHz overall. De- ment, is. sensitive to noise over a wide the signal is applied to the device under pending on the measurement require- range of frequencies. In general, this is test, such as an amplifier or filter, and ments, the bandwidth (resolution) can
"white" noise (equal energy per unit of the output of the device is connected to be switched over a 1 -to -300 -Hz range, bandwidth) so that each octave of fre- the spectrum analyzer input, it becomes in a 1,3,10sequence. quency coverage contains as much en- possible to measure frequency re- Earlier, we mentioned the importance ergy as the total of all lower octaves. No sponse characteristics over an almost of scanning slowly enough for the highly matter how quiet an amplifier may be, if incredible dynamic range. For example, selective filter to "build up" to its full re- its distortion is very low, it is likely to be if the rejection characteristics of a filter sponse. An ingenious interlocking logic submerged in the noise, especially at are to be measured conventionally using system between the sweep width, band- low power levels. This is why THD mea- a broadband meter or chart recorder to width, and sweep time controls warns surements made on very clean amplifi- display its output, it is difficult to mea- the user of excessive scanning velocity ers usually rise as the power output is sure the actual depth of the rejection (the frequency range covered in a given reduced to a small fraction of one watt. notch, which can become obscured or time) by turning on a front -panel LED. In The distortion is below the fixed noise filled in by noise, hum, or other extrane- this case, the sweep must be slowed level, which becomes a greater percent- ous signals. With the combination of an down, or the bandwidth increased, until age of the reference level as power is re- analyzer and synchronous sweeping the LED is extinguished. The scan time duced. generator, a narrow i -f bandwidth can be can be adjusted from 0.01 seconds per The narrow bandwidth of the spec- used to virtually eliminate noise, so that division to 200 seconds per division, cor- trum analyzer drastically reduces its the lower limit of measurement is set responding' to full scan times from 0.1 susceptibility to noise. Signal compo- only by the available signal voltage and seconds to 2000 seconds (more than 33 nents which are totally submerged in the analyzer sensitivity. Measurement minutes). noise in a wide -band measurement can dynamic ranges of 100 to 120 dB are Since typical scanning times in audio easily be seen and measured with the routine, and even greater ranges can be measurements are often 10 seconds to analyzer. The resulting "THD" figure, achieved with care. a minute or more, an ordinary CRT dis- computed as described previously, is Just as scopes are made with narrow play would be of little value (one would not only lower than the reading of a dis- or wide amplifier bandwidths, depending see only a slowly moving dot of light, tortion analyzer, but is more meaningful on their application, spectrum analyzers rather than a complete trace). Some- as well. are available 'for all frequency ranges times a storage cathode ray tube is used from subsonic to microwave. The reso- to "hold" the display, but H -P has cho - Applications. It would be impossible lution and stability requirements, and the ser to incorporate a highly effective digi- to list, even in a cursory manner, the input impedance required for the differ- tal storage system to achieve the same many applications of a spectrum analyz- ent frequency ranges vary widely,. as do result with a relatively inexpensive, con- er in audio equipment testing. In gener- the specific applications. ventional cathode ray tube. A random
NARROW- INPUT .. MIXER ~i BAND DETECTOR AMPLIFIER AMPLIFIER . Fig. 2. A swept spectrum analyzer is basically a narrow -band superheterodyne whose voltage -controlled local oscillator is swept across a narrow frequency. Output is displayed on a CRT. 1 VOLTAGE SWEEP TUNED GEN. AMPLIFIER CRT LOCAL "OSC.
JANUARY 1978 51
AmericanRadioHistory.Com The amplitude display of the H -P 3580A has an effective range of about 90 dB, with each vertical division corre- sponding to a 10 -dB level change. The amount of noise visible on the baseline depends on the i -f bandwidth and the signal characteristics, but in most cases signal measurements can be made over a range of more than 80 dB. For a more detailed study of small amplitude varia- tions, the vertical scale can be changed
to 1 -dB per division, with the top 10 dB i . of the full display covering the entire screen height. In addition, there is a lin- ear vertical scale, providing an absolute voltage readout. Depending on the input attenuator setting, a full -screen deflec- tion can be obtained with signal ampli- tudes as great as 100 volts (across the 1-megohm input impedance of the analyzer) to as little as 100 nanovolts (0.1 microvolts). An intriguing and unique feature of the 3580A is its "adaptive sweep". To accel- Fig. 3. Harmonics don't show in erate a very slow scan analysis, when Fig. 5. Top (A) is output of one scope photo (A, top) of 1 -kHz only a few signal components are ex- channel of FM tuner with 1 -kHz sine wave, but they do in photo pected to be present, the scan can be signal. Spectrum analysis (below) shows 42-dB channel separation. of analyzer display (B, bottom). adjusted to speed up by a factor of about 20 times until a signal greater than the access memory (RAM) is used to hold pre -determined level is encountered. At Especially in audio -frequency re- the horizontal and vertical CRT spot po- this point the sweep stops, "backs up" sponse measurements, it is often desir- sition information. The frequency scan slightly in frequency, and scans through able to expand the lower frequency por- data, corresponding to the horizontal the signal at the selected slow rate, to tion of the display to show greater detail axis of the display, is stored sequentially give an accurate frequency and ampli- in the few octaves which would other- in the 1024 memory addresses of the tude readout. Then, it speeds up until wise be compressed into a small portion RAM. At each address, the signal ampli- the next signal is encountered. of a linear frequency scan. A logarithmic tude (vertical axis) is converted to an 8 - sweep is provided for this purpose, bit "word" by an A/D (analog -to -digital) spreading the 20 -to -20,000 -Hz audio converter, and stored in that address. band across almost the full screen width The 8 bits gives a total of 256 amplitude in three equal decades of frequency. levels, and the maximum resulting error of 0.4% is well within the instrument's Waveform Examples. To illustrate ratings. The information is stored in "real the capabilities of a high -resolution time", as it is being developed by the scanning spectrum analyzer in audio slow analyzer scan. However, it is simul- testing, we have taken photographs of taneously read out of the memory at a its display in some typical measurement fixed rate of 50 times per second, situations, contrasting them with the ap- passed through D/A (digital -to -analog) pearance of the same signal on an oscil- converters, and used to position the spot loscope screen. Fig. 3A shows two cy- on the CRT display. The display is seen cles of a 1000 -Hz sine -wave signal at an as a bright, nonflickering trace, which amplifier output. To the eye, it appears moves more or less slowly across the to be a pure, undistorted sine wave. The screen as the analyzer scan proceeds. same signal displayed on the spectrum It is possible to store any one trace in- analyzer, sweeping from 0 to 5000 Hz is definitely by using the "single sweep" shown in Fig. 3B. The 2nd, 3rd, and 4th capability of the analyzer. If one wishes harmonics are visible, at amplitudes of to store a trace and have it available for -62 dB, -59 dB, and -70 dB. The comparison to a later scan, pressing the equivalent THD reading (which was con- STORE button on the panel retains the firmed by our distortion analyzer) was existing scan information in half the ad- 0.014%. Obviously, much lower distor- dresses, while the remaining 512 ad- tion percentages, down to 0.003% or less, be displayed on the analyzer dresses are used for the subsequent Fig. 4. Spectrum analyzer (B, can scan storage. By reading out all 1024 bottom) shows undesirable even screen. addresses, one sees both scans simul- harmonics in square wave which To all appearances the 1 -kHz square taneously. appears clean on scope (A, top). wave shown in Fig. 4A has good 52 POPULAR ELECTRONICS
AmericanRadioHistory.Com symmetry and rise -time characteristics. is for AM rejection, using a signal which The same signal, viewed on the spec- is frequency modulated 100% at 1000 trum analyzer scanning from 0 to 10 kHz Hz, and simultaneously amplitude mod- (Fig. 4B) shows higher than theoretical ulated 30% at 400 Hz. The resulting amplitudes for the 3rd, 5th, 7th, and 9th spectrum centered at 700 Hz is shown in harmonics,. and the presence of all even Fig. 7 with a scale factor of 0.1 -kHz per harmonics (which should be entirely ab- division. At the right is the output from sent in a true square wave) at a level of the FM modulation, and at the left is the about -30 dB, or 3%, relative to the fun- 400 -Hz component resulting from the damental frequency. The even harmonic tuner's inability to completely reject the content shows a lack of symmetry in the AM portion of the signal. Nevertheless, square wave, which is not easily seen in the AM rejection of 68 dB represents ex- Fig. 6. Spectrum analysis of line power shows hum components the scope photo. cellent performance. at 60, 120, and 180 hertz. We supplied an FM stereo tuner with The total output of the FM tuner, over an r -f signal modulated 100% in the left the full range of the analyzer, is shown in channel by a 1000 -Hz sine wave. The Fig. 8. The frequency scale is 5 -kHz per tuner's left channel output is shown in division. At the left is the 1000 -Hz audio Fig. 5A as it appeared on the scope, output, followed by its harmonics. The essentially a sine wave. However, in Fig. 19 -kHz pilot carrier leekage is down 68 5B, the spectrum analyzer displays both dB (very good) and it is flanked by a the left and right channel tuner outputs number of modulation products. Note (using its storage facility), over a range that any of these products below 15 kHz of 0 to 5000 Hz. The fundamental 1000 are more than 70 dB below program lev- Hz output is seen at two levels, showing el, and therefore inaudible. Finally, there that the channel separation of the tuner is a small amount of 38 -kHz leakage was a good 42 dB. Note that the various from the multiplex demodulator, with ad- harmonics of the modulating frequency jacent sidebands at 37 and 39 kHz. appear at the same amplitude in both To make a frequency -response mea- Fig. 7. Analysis of FM tuner has channels. If the channel separation surement on the tuner, we passed the 1 -kHz component at right, 400 -Hz AM near left, indicating AM measurement had been made with a synchronously swept signal from the rejection is about 68 dB. meter, the 2nd harmonic would have spectrum analyzer through the Sound dominated the measurement, making Technology 1100A Signal Conditioner the separation appear to be about 33 to (a precision FM preemphasis unit) and 34 dB. The analyzer display also shows modulated the S -T 1000A Signal Gener- that the THD of the tuner under these ator with its output. Using the LOG conditions was 2.1%, or -33.7 dB. sweep of the spectrum analyzer, we can We next examined the tuner output for see in Fig. 9A that the response is es- signs of power line hum, using a sentially flat to just beyond 15 kHz, dip- 0 -to -200 -Hz sweep with an analyzer ping sharply at 19 kHz and higher fre- bandwidth Of 1 Hz. The time required for quencies. Noticing a "glitch" at about 10 this measurement (Fig. 6) was 500 sec- kHz, we repeated the scan using the onds, or more than 8 minutes. The refer- 1 -dB per division amplitude scale, ence (0 -dB) level was set to the output shown as the lower trace on the photo from a 100% modulated test signal. The (again, a convenience afforded by the Fig. 8. Analysis of FM tuner has presence of hum components at 60, dual -trace storage capability of the in- 1 -kHz modulation signal followed 120, and 180 Hz can be seen, with re- strument). This reveals a response flat by harmonics. Also shown are 19 -kHz spective amplitudes of -85 dB, -84 dB, within 1 dB from 20 Hz to just below 15 pilat carrier, its modulation and -84 dB. kHz, but with a definite, sharp irregulari- products, and 38 -kHz signal leakage. Another common tuner measurement ty at about 10 kHz. For a still better look, we repeated these measurements with the linear scan from 0 to 20 kHz (Fig. 9B). This shows the response "glitch" in better detail, and also shows that the high -frequency roll -off becomes signifi- cant above 14 kHz (the LOG scan can- not be read as accurately). These examples illustrate but a few of the audio measurements which can be made more rapidly, thoroughly, and ac- curately with the spectrum analyzer than with more conventional instrumentation. With the addition of this powerful tool to Fig. 9. Upper trace (A, left) shows tuner response flat our laboratory, we expect to provide to about 15 kHz. Note "glitch" at 10 kHz. Lower trace even more definitive test information in is on 1 -dB scale. Linear scan (B, right) show's more detail. our future product reports. O JANUARY 1978 53
AmericanRadioHistory.Com FM tuner specifications can help you The dBf figure is' significant for two microvolts are needed at a tuner's 75 - assess how well a given model will reasons. First, because it measures ohm input as at its 300 -ohm one; 75- work in a particular area, given a good power, not voltage, it is the same for ohm microvolt figures should therefore FM antenna. You won't find many of measurements taken at a tuner's 300 - be doubled before comparing them with these specifications in most advertise- ohm and 75 -ohm antenna inputs. A tun- 300 -ohm figures.) ments, but you will likely read them in er rated at 1.0 µV across its 75 -ohm in- manufacturers' literature on FM tuners put (common practice, overseas) is not Selectivity. This measures the tuner's (and on the tuner sections of receivers). more sensitive than one rated at 2.0 µV ability to reject signals on frequencies In the accompanying tables, you'll find across 300 ohms (as is the practice near that of the station to which it is the most important specifications (as here)-both are equivalent to 11.2 dBf. tuned. The alternate -channel selectivity listed by their manufacturers) for nearly Second, because the figures are loga- figures given here indicate ability to re- 100 separate tuner models, grouped by rithmic, as all dB figures are, they em- ject signals 400 kHz above or below the suggested retail prices for easy com- phasize the real meaning of differences desired frequency. An IHF selectivity fig- parison. Bear in mind, - though, that man in sensitivity. A difference in tuner sensi- ure of 70 dB, for example, means that it
BY IVAN BERGER, Senior Editor 197$ STE REO GFI 9 DUNE:' BIJ11X9 SIP ECTOIPY Specifications and features of today's most popular FM tuners
ufacturers reserve the right -to change tivity of 3 dBf always means one tuner is takes an alternate -channel signal 70 dB these suggested prices without notice, twice as sensitive as the other, whether stronger than the desired -channel signal and dealers need not adhere to them. the figures we're comparing are 9.8 and to produce interference 30 dB below the 12.8 or 35 and 38 dBf. But a sensitivity level of the desired signal. Interference Sensitivity. The single most -adver- difference of 0.5 microvolts, quite signifi- from signals less than 70 dB stronger tised tuner specification,. IHF mono- cant when we're comparing 1.5 and 2.0 would produce much less interference phonic sensitivity, is among the least µV, is of almost no significance when than that. useful ones in judging tuner perfor- comparing 35 with 35.51.1V. Tuners with variable i -f bandwidth mance. This "usable sensitivity" figure Whether in dBf or µV, sensitivity is (see under Features) are more selective defines the input signal.a tuner requires most important to listeners in weak sig- at their narrow -band settings. (However, for a signal-to-noise and distortion ratio nal areas. If that's your problem, try a not all makers of dual -bandwidth tuners of only 30 dB-hardly "usable," in hi-fi better antenna before replacing your give both narrow -band and wide -band terms. Still, in many cases,. it's the only tuner. It can often make your current figures.) The higher the selectivity, the sensitivity specification provided. tuner the equivalent, for all practical pur- less potential interference. High selec- More significant is the second sensi- poses, of a rather more expensive one. tivity is especially desirable in suburban tivity figure, the signal needed for 50 dB Even if you then find you still need.a bet- and metropolitan areas where signals of quieting-listenable, if still not quite ter tuner, the new antenna will' help your from different towns or cities are some- hi-fi by current standards. Since most new model deliver all the performance times found on alternate channels. (Se- listening is done in stereo, the 50 -dB you're paying for. lectivity figures for adjacent-channel sig- stereo sensitivity figure is more signifi- The -smaller the sensitivity figure the nals-those 200 kHz above or below the cant still. Though usable sensitivity fig- better, whether it's expressed in mi- desired frequency-are rarely published ures are usually given in microvolts of crovolts across a 300 -ohm input or in by. manufacturers, and are always con- signal voltage level, the 50 -dB figures dBf. (Note that dBf, which expresses siderably lower than alternate -channel are usually given in "dBf"-that is, dB signal power, remains constant' for both figures.) above a signal power level of one fem- 75 -ohm and 300 -ohm antenna inputs. towatt (10-15 watt). For the same ,power, only half as many Capture Ratio. FM tuners can distin- 54 (Continued on page 57)
AmericanRadioHistory.Com FMI TUNER COMPARISON TABLE
Features . _ó ' m c v Sensitivity ln/.CV(ódet) z Distortion 'e 5 Rejeltion (in dB) w g m=A ... Price = ó (percent) & c ó _ ó Meten' 2 s 1 Remits Make Model 50 -dB Quieting c c IHF -- É ,..g.201 ,. ó o o 1K/10K Spur- m c I ' s AM lmape Mona I`` c m Mano 1 Stereo ` 1 o Mono Stereo Hertz Ions ó ó= s II I: UP TO $200 , Akal AT -2200 165 1.9(10.8) - (-) - (-) 60 1.3 70 0.3 3.5 40/- 50 55 85 S,C Akai AT -2400 185 1.8(10.3) - (-) - (-) 80 1.0 75 0.2 0.3 42/- 55 90 100 S,C X FisherFM2110 160 1.8(10.3) 2.8(14.1) 38(36.8) 70 1.0 72 0.4 0.5 40/30 60 60 85 S,C Harman-Kardon 1403 195 1.7(9.8) 3.8(16.8) 45(38.3) 50 2.0 73 0.5 0.7 40/30 55 45 0 only. Heath 4.1-1219 110 2.0(11.2) - (-) - (-1 60 2.0 - - - -/40 50 - - - Kit JVC JT-V31 170 1.9(10.8) 4.0(17.2) 40(37.2) 60 1.2 72 0.2 0.35 45/35 50 - - S.0 JVC JI -V11 150 1.9(10.8) - (-) 40(37.2) 60 1.0 72 0.2 0.4 40/30 - - - S.0 Kenwood KT -5300 140 1.9(10.8) 5.0(19.2) - (-) 60 1.0 70 0.2 0.3 30/30 50 - 70 C Lafayette LT -40 150 2.0(11.2) 3.1(15.0) 39(37.0) 68 1.6 72 0.2 0.6 40/- - 50 90 S,C Marano 2100 200 1.9(10.8) 2.5(13.2) 40(37.2) 80 1.0 75 0.15 0.3 45/40 55 85 90 S.0 X Nikko FAM-450 140 2.0(11.2) - (-) - (-) 55 1.6 65 0.4 - 42/- - 45 - - X Onkyo 1-4 200 1.9(10.8) 3.5(16.1) 40(37.2) 60 1.5 70 0.2 0.4 40/30 50 60 85 S.0 X Optonica ST -1515 180 1.7(9.8) 5.5(20.0) 44(38.1) 6c 1.2 72 0.2 0.3 45/35 50 82 80 S.0 X X Pioneer TX -6500 II 200 1.9(10.8) 2.8(14.1) 44(38) 60 1.0 75 115 0.3 40/30 50 60 - C Pioneer TX -5500 II 150 1.9(10.8) 2.8(14.1) 44(38) 60 1.0 72 0.15 0.3 35/30 50 60 - C Realistic TM -1000 170 2.0(11.2) - (-) - (-) 65 2.0 - - - 35/- - - - S Rotel RT-725 200 1.8(10.3) 3.0(14.7) 44(38.1) 60 1.5 70 1.2 0.3 42/31 50 - - S.0 X X Rotel RT-425 170 1.9(10.8) 3.1(15.0) 44(38.1) 50 1.5 70 0.2 0.3 40/30 50 - - C X SansuiTU-3900 160 2.0(11.2) -(-) -(-) 60 2.0 70 0.3 0.4 40/- - 55 70 S,C X SansuiTU-217 175 1.85(10.5) 2.7(13.8) - (-) 50 - 71 0.12 0.13 -I- - - - S.0 Sanyo FMT 1001 K 150 2.0(11.2) - (-) - (-) - 1.0 70 0.4 40/- 55 60 - C X H.H. Scott T-516 150 2.2(12.0) 3.5(16.1) 70(42.1) 55 1.5 68 0.3 0.5 40/34 50 50 80 S X Superscope T-210 105 - (-) 10(25.2) 55(40.0) 25 6.0 60 1.0 - 30/15 35 - - S Technics ST -7300 180 2.0(11.2) 3.0(14.8) 45(38.3) 75 1.0 75 0.5 0.5 45/35 55 55 80 S.0 X Webcor 291 130 -(-) -(-) -(-) 45 1.2 65 0.2 0.4 30/25 45 50 - S.0
Average 165 1.9 (16.2) (38.1 60 1.6 0.3 0.4 38/32 48 57 84 I ...... _ tl: $2014280
Aka! AT -2600 275 1.7(9.8) - (-) - (-) 100 1.0 75 0.2 0., 451- 55 110 110 S/D,C X preselect Armstrong 624 250 3.0(10.3) - (-) - (-) 56 1.75 65 0.2 0.2 40/- 50 50 - S/C FM only; 6 -station , 75 46/36 65 80 100 S,C,M/D X . Fisher FM -2310 250 1.7(9.8) 2.5(13.2) 34(35.8) 75 0.8 0.1 0.15 Hitachi FT/520 240 1.7(9.8) 3.5(16.1) 39(37.0) 80 1.0 74 0.15 0.25 45/- 55 85 100 S.0 1.0 75 0.1 0.1 50/45 55 'S,C X 1 JVC JT-V71 270 1.8(10.3) 3.8(16.8) 38(36.8) 75 - - Kenwood KT -7500 275 1.7(9.8) 2.8(14.1) 35(36.1) 30' 1.0' 75 0.08 0.1 50/43' - 105 110 iS,C X 100' 2.0' 45/38' Mitsubishi DA -F10 260 2.5(13.2) 5.5(20.0) 55(40.0) 45' 0.8' 75 0.06' 0.1' 45/40' 55' 75 90 S,C X 75' 1.5' - 0.2' - 35/30' 50' - - . Nikko NT 850 230 1.8(10.3) - (-) - (-) 35' 1.0' 79 0.08' 0.19 48/40' 60 - - S,C X X Multipath Indication. 90' 1.5' 70' 0.2' 0.4' 35/32' - - - Onkyo T-9 280 1.7(9.8) 3(14.7) 35(36.1) 80 1.5 - 0.15 0.3 40/35 50 83 95 S.0 X X X SansuiTU-5900 230 1.8(10.3) 3.5(16.1) 45(38.3) 60 2.0 70 0.25 0.35 40/30 55 50 65 S,C X X H.H. Scott T-527 250 1.8(10.3) 3.5(16.1) 40(37.2) 55 1.5 68 0.3 0.5 40/34 50 70 80 S.0 X H.H. Scott T-526 230 1.9(10.8) 3.5(16.1) 40(37.2) 55 1.5 68 0.3 0.5 40/34 50 50 80 S.0 X Sherwood ST -8080 250 2.0(11.2) - (-) - (-) - 1.0 70 - - 45/- 55 85 - 'S,C Sony ST-2950SD 220 2.0(11.2) 4.0(17.2) 50(39.2) 50 1.0 73 0.2 0.3 40/35 54 45 75 S,C X X Technics ST -8080 250 1.9(10.8) 2.5(13.2) 28(34.1) 85 1.0 75 0.15 0.3 45/35 55 85 95 :S,C X 100 X Toshiba ST -420 220 1.9(10.8) -(-) -(-) 70 1.0 72 0.2 0.3 45/- 55 85 'S,C Yamaha CT -$10 250 1.8(10.3) 3.2(15.3) 40(37.2) 80 1.0 80 0.08 0.1 50/45 55 90 100 S/O,C X X
76 Average 250 1.9 (16.0) (37.3) 73 1.1 73 1 0.14 0.27 41/34 55 92
Ill: 0281-$380 Armstrong 623 359 3.0(10.3) - (-) - (-) 65 1.75 65 0.2 0.2 40/- 50 50 - S/C 3 FM & 3 AM preselect. Dynaco FM -5 319 1.75(10.1) 5.0(19.2) - (-) 65 1.5 65 0.5 0.9 40/30 58 - - S,CL x' FM only. Also as kit, $199. Heath AJ-1515 380 1.8(10.3) -(-) -(-) 100 1.5 70 0.3 0.35 40/25 65 90 90 S.0 X Kit only. Dig. readout. HhachiFT/920 300 1.6(9.3) 3.1(15.0) 34(35.8) 80 1.0 74 0.15 0.25 45/- 55 - 100 S/M,C Lux T -88V 345 2.0(11.2) 2.8(14.1) - (-) 60 1.8 72 0.2 0.3 43/30 50 75 - X Marantz 2120 300 1.8(10.3) 2.5(13.2) 35(36.1) - - 80 - - 50/42 55 90 100 S,C X' X X X 34(35.8) 1.0 75' 50/40' 60 110 X FM only. Nikko Gamma 1 350 1.8(10.3) 4.5(18.3) 35' 0.05' 0.08' - S.0 85' - 72' 0.08' 0.2' 35/32' - - - Optonica ST -3636 300 1.7(9.8) - (-) - (-) 80 2.0 77 0.2 0.4 50/40 50 120 120 S,C/M X Pioneer TX -8500 II. 300 1.8(10.3) 3.5(16.1) 40(37.2) 35' 0.8' 79' 0.15 0.8' 45/35' 55 85 90 S.0 X X X 80' 2.0' 75' 0.15 0.9' 45/30' - - - Rogers T-75. Series 2 319 1.5(8.75) 4.0(17.2) 30(34.7) 60 1.5 70 0.3 0.7 40/35 50 - - Rotel RT-925 340 1.7(9.9) 3.0(14.7) 35(36.1) 80 1.5 70 0.1 0.3 45/31 60 - - S.C/M X X SansuiTU-717 320 1.75(10.1) 2.45(13.0) 40(37.2) 50' 1.2' 80 0.07' 0.07' 45/38 60 86 90 S,C X X X X 80' 1.7' - 015' 0.22' - - - - - Sedan TUS -600 380 1.8(10.3) 4.0(17.2) 40(37.2) 80 1.5 70.5 0.09 0.11 55/45 65 - - S.0 X Sony ST -3950 SD 300 1.7(9.8) 3.0(14.7) 40(37.2) 80 1.0 75 0.15 0.25 40/35 56 80 90 S/M,C x X Sony ST -4950 350 1.9(10.8) - (-) - (-) 80 1.0 70 0.15 0.3 40/- 53 70 100 S/M.0 X TechnicsST-8600 330 1.9(10.8) -(-) -(-) 85 1.0 80 0.15 0.2 -/- - - 95 S,C X' X Yamaha CT -1010 350 1.9(10.8) 3.2(15.3) 40(37.2) 85 1.0 80 0.07 0.1 52/45 65 110 110 S/O,C X
Average 350 1.85 (15.7) (36.5) 78 1.3 74 0.18 0.33 45/36 57 72 100 ti
C = center of channel M = multipath 'With i -f bandw 0th set at "wide" position. 'Automatic. D = deviation 0 = signal quality (S/N or signal -minus multipath) 'With i -t bandwidth set at "narrow" position. 'Estimated. d = digital indication S = signal strength 'Optional. L = light Indication 55
AmericanRadioHistory.Com 'FM TUNER COMPARISON TABLE (Continued) o oo Features E. Sensitivity in µV08081) á -' z ó c Rejection ó DlclartÍon (i1 d8) t Price á ti _ Make 8 Model > c - mD o m (percent) 50 -dB Quieting c Melon' l $ l Remarks 1 INF ó = E0 v. o ó 1K/10K Spur- a m Mono rn W_ AM Image ó r - Ire Mono , Stereo Mono I - OJ Stereo Hertz lout ot cc IV: $3814600
Accuphase T-101 500 2.0(11.2) 4.5(18.3) 45(38.3) 55' 2.0 75 0.1 0.2 45/30 55 80 100 S,C,M X FM only. 100'
. Dynaco AF -6 395 1.75(10.1) 5.0(19.2) (-) 65 1.5 - 65 0.5 0.9 40/30 58 S,CL Kit $269. Harman-Kardon - - Citation 18 595 2.0(11.2) 3.2(15.3) 40(37.2) 70 1.5 74 0.15 0.3 50/- 55 63 100 O,CL x Heath AJ-1510A 500 1.8(10.3) - (-) - (-) 95 1.5 68 0.3 40/25 90 - - - S/M X Kit only. Dig. synth. Autoscan 8 3 presets. Heath AN -2016
, "Modulus" 600 1.7(9.8) 3.5(16.1) , 35(36.1) 100 1.3 68 0.3 0.35 40/20 68 90 90 S,C X' Kit orily.Incl. 2/4- channel preamp. Dig. display. JVC T-3030 600 2.0(11.2) 3.8(16.8) 38(36.8) 70 1.0 75 0.08 0.1 50/45 65 110 110 SL X X Dig. synth. 7 preselects. Autoscan. Kenwood L -07T 500 1.6(9.3) 2.8(14.2) 38(36.8) 30' 1.0' 80 0.08' 0.1' 50/45 65 110 110 S,C X X FM only. 100' 1.5' - 0.15' 0.15' Kenwood 600T 600 1.6(9.3) 2.8(14.1) 38(36.8) 110 0.8 84 0.05 0.08 50/45 65 120 120 S,C,M/D X X FM only. 3 i -f bandwidth. ' Kenwood KT -8300 450 1.6(8.3) 2.8(14.1) 30(34.8) 40' 1.0' 78 0.08 0.1 50/45' 60 110 110 S,C,M/D X
. . r110' 1.5' 45135' Lux T-110 525 1.6(9.3) 2.2(12.0) 70 78 34(35.8) 1.3 0.08 0.08 48/38 53 100 - S,C X FM only. Nakamichi 430 400 1.8(10.3) 4.0(17.2) 40(37,2) - 70 60' 1.5' 0.06' 0.09' 50/35' 60 100 100 CL X' X X FM only. 40' 4.0' 0.02' 0.040 30/30' Phase 499 Linear 5000 2.0(11.2) 4.0(17.2) 1 30(34.7) 75 1.5 70 0.2 0.25 40/30 60 110 120 S,C,ML X FM only. With expanders. Philips AH673 600 1.6(9.3) 2.5(13.2) 30(34.7) 110 1.0 '5 0.09 0.1 47/38 50 110 110 S,C/M Pioneer TX -9500 II 400 1.5(8.7) 2.5(13.2) 35(36.1) ' 35' 0.8' 82 0.05' 0.07' 50/35' 65 120 110 S,C X X Audible multipath check. 85' 1.0' - 0.07' 0.25' 35/30' - - - Rotel RT-1024 570 1.5(8.7) 2.1(11.6) 35(36.1) - 80 1.0 75 0.1 0.2 47/35 60 - - S,C,M,D X X X X SansuiTU-9900 460 1.5(8.7) 3.0(14.7) - (-) 55' 1.0' 80' 0.06' 0.08' 50/40' 58 96 100 S/M,C X X X X 90' 3.0' 76' 0.5' 0.8' 30/30' - - -
Sherwood HP -5500 500 1.6(9.3) ' 2.5(13.2) 25(33.2) 85 1.0 70 0.12 0.15 55/40 65 120 120 S,C X X
Sony ST SD 470 1 -5950 I 1.5(8.7) 2.8(14.1) 35(36.1) 85 1.0 76 0.1 0.2 50/40 66 90 100 S/M,C X Technics ST -9030 400 2.4(12.8) 4.4(18.1) 44(38.1) 25' 0.8' 90 0.08' 0.08' 50/40' 58' 135 135 S,C X'' 0' 900 . 2.0' - 0.15' 0.3' 40/30' - - - L Average 510 1.7 (15.5) (36.2) 87 1.2 75 0.14 0.2 47/36 60 104 109
V: $601 and up. I I , Accuphase T-100 750 2.0(11.2) 4.5(18.3) 45(38.3) 70 1.5 75 0.1 0.2 45/30 60 90 100 S,C,M Lux 5150 1495 1.7(9.8) 2.5(13.2) 35(36.1) 72 1.1 70 0.08 0.1 45/40 55 100 100 SO X X Digital synth. FM only. Audible multipath detector. 7 -station preselect. McIntosh MR 78 899 2.0(11.2) - (-) - (-) 55' 2.5 75 0.2 0.2 40/- - 100 100 S/M,C X FM only. 31-1 bandwidths. 900 McIntosh MR 77 699 2.0(11.2) - (-) - (-) 50 2.5 - 0.2 0.2 40/- - 100 100 S.ML.0 FM only. McIntosh MR 74 699 2.5(13.2) - (-) - (-) 58 1.5 - 0.3 0.5 35/- 69 100 100 S,ML,C Nakamichi 630 630 1.5(8.7) 5.0(19.2) - (-) 45' 1.0 55 0.05' 0.08' 55/35' 69 , 100 100 SL,CL X X X Combined with stereo preamp. 90' - -- 0.1' 0.1' 30/30' - - - FM only. RAM Audio 102 639 1.6(9.3) 2.2(12.0) 34.5(36.0) 70 1.5 75 0.08 0.08 46/35 53 - - X FM only. Revox 8760 1145 2.0(11.2) 2.0(11.2) 20(31.2) 80 0.9 75 0.15 0.15 42/- 70 106 106 S,C X X X Digital synthesis.15-station preselect. SAE 8000/Mark Viii 650 1.6(9.3) 2.2(12.0) 120 1.5 70 25(33.2) 0.15 0.2 45/35 100 100 100 S,C 'X Digital readout. FM only. H.H. Scott T -33S 1000 1.8(10.3) 3.5(16.1) 40(30.3) 70 55 1.2 0.2 0.4 40/40 75 75 90 S,M X Dig. Synth. Pre-programmed channel select. Dig. readout. Sequerra Model 1 3000 1.7(9.8) 15.5(29) 100 - (-) 0.75 75 0.07 0.07 52/38 70 90 - Scope X X X Built-in oscilloscope. Sequerra Modell 1750° - (-) 1.7(9.8) 15.5(29) 100 0.75 75 0.07 0.07 52/38 70 90 - S,M X X X 3 -station preselect. Setton RC3 X1000 3500 1.2(6.8) 5.0(19.2) 20(31.2) - 1.0 72 0.2 0.4 55/30 - 80 90 SL,CL X' X Digitaldlsplay.Built-inpreamp. Sherwood Micro CPU 100 2000 1.7(9.8) 2.6(13.5)' 30(34.7)' 18' 0.5' 75 0.07' 0.15' 50/40' 65 130 130 S,M X X Dig. Synth. FM only. 2.1(11.7)' 25(33.4)' - 00' 1.0' - 0.1' 0.2' 45/35' Call-letter display. ' Toshiba ST -910 1800 1.8(10.3) - (-) - (-) 70 1.0 75 0.15 0.2 -/40 65 100 100 SL Dig. synth. Autoscan. 7-sta. preselect. FM only. ! Yamaha CT -7000 1200 2.0(-) - (-) - (-) 18' 0.7' 78' 0.08' 0.15 50/35 60 120 120 S/O,C X' X 85' 1.0' 0.2' 0.3'
f Average 1.5 (13.6) (33.2) 81 1.2 74 0.13 0.18 45/33 167 100 104 I I - 11390 1 k M = 'C = center of channel multipath .With i -f bandwidth set at "wide" position. 'Automatic. D = deviation 0 = signal quality (S/Nor signa_i-minus multipath) 'With i.1 bandwidth set at "narrow" position. 'Estimated. - d = digital indication S = signal strength 'Optional. L = iight'iodication
56 POPULAR ELECTRONICS
AmericanRadioHistory.Com (Conntinued from page 54) tainous or hilly regions, where there are shows the presence of other signals on many reflective surfaces from which the nearby frequencies. guish between two signals on the same signals can bounce. The higher the AM channel, even when they are of almost suppression figure, the more resistant Features. We have listed here only equal strength, suppressing the weaker the tuner is to such interference. some of the more common and signifi- to "capture" the stronger one. Capture cant features. A few significant ones are ratio is the minimum ratio in dB between Image Suppression. This measures listed under "Remarks." co -channel signals which will allow the the tuner's ability to reject signals 21.4 Dolby decoding is built into several of tuner to suppress the weaker one's in- MHz above the desired signal (21.4 the tuners in our table, and available as terference by 30 dB. The smaller this fig- MHz is twice the tuner's i -f frequency of a plug-in option for a few more. A de - ure, therefore, the better. (Note that, un- 10.7 MHz). This is most important to emphasis switch, necessary for correct like selectivity, capture ratio improves at those who live near airports, as air -to - frequency response when using an ex- a tuner's wide -band setting.) Capture ground channels (108-136 MHz) are ternal Dolby decoder, is available on ratio is likely to be most important for lis- within the image -frequency range for FM several tuners also. teners in fringe areas equidistant from tuners. High -blend is a very useful aid in lis- two stations on the same frequency. tening to marginal stations in stereo. By Spurious Response Rejection. blending together the higher frequencies Ultimate S/N. This is the maximum The interaction of two strong signals of both stereo channels, it reduces noise signal-to-noise ratio the tuner can deliv- (neither of them necessarily within the and distortion while maintaining separa- er. Since most tuners will reach this FM bandy can cause a tuner with a non- tion at the middle frequencies to keep maximum with signals of 65 dBf (978 mi- linear front end to "receive" nonexistent some stereo effect. crovolts) or less, ultimate S/N is usually signals which are actually the sum of or A recording oscillator is simply an aid measured at that point. The monophonic difference between the two interacting to setting recording levels for taping off figure is listed here; the stereo figure signals. A strong station's popping up at the air. The oscillator's output corre- would be lower. As with all signal-to- several points along the dial would be a sponds to the tuner's output at a speci- noise ratios, the higher the figure, the typical spurious -response symptom. If fied signal modulation level (usually cleaner the sound. your tuner suffers from this or other 50% modulation), allowing the recording strong -signal overload problems, look level to be adjusted for best signal-to- Distortion. Manufacturers differ in for a tuner with a high spurious - noise ratio and minimum distortion. their distortion specification methods. response rejection figure. Bandwidth switching allows the user Some list harmonic distortion only at one to trade selectivity (at its maximum when frequency (usually 1 kHz), others list it at Meters. Several types of meters are the i -f bandwidth is narrowest) for better several. Some list harmonic distortion provided as tuning aids. Center-channel capture ratio, signal-to-noise ratio, dis- only, while others give intermodulation meters (C) help you tune accurately to tortion and separation (all best at wider distortion figures, too. When only a sin- the station's exact frequency. They're bandwidths). When extra selectivity is gle distortion figure is given, assume it to found on virtually all tuners except the needed to pick a particular station out be harmonic distortion at 1 kHz, which is lowest -priced ones-and some of the from a clutter of strong ones on nearby the figure listed here. Note that stereo highest -priced tuners, whose digital - frequencies, the user can narrow the distortion figures tend to be higher than synthesis circuits render these meters tuner's bandwidth to get extra selectivity mono. superfluous because they always tune at the expense of a slight reduction in directly to the channel's center. Signal - the other parameters. Tuners with three - Separation. This figure measures the strength meters (S) provide some help position bandwidth selectors are noted crosstalk between stereo channels. The in finding the exact station frequency under "Remarks." more separation, the greater the poten- (the signal presumably peaks at that Digital tuning comes in two flavors: tial stereo effect. Since separation tends point), but are more useful in orienting Tuners with digital displays may be oth- to decrease at higher audio frequencies, the antenna for maximum signal erwise conventional in that they tune it is listed in the table, wherever possi- strength. continuously across the FM band. Digi- ble, for both 1 kHz and 10 kHz. Separa- Multipath meters (M) or signal -quality tal synthesis tuners, though, also have tion commonly decreases at bass fre- meters (0) are even more useful in ori- digitally controlled local oscillators that quencies, too, but its effects are less au- enting the antenna, as they help you find allow them to tune in direct jumps from dible at those frequencies. the direction which yields the cleanest one station frequency to another without signal. (This may not necessarily be the observably moving through any of the AM Suppression. This has nothing same direction that yields the strongest frequencies between. This also simpli- to do with AM broadcasting, but rather one). Deviation meters (D) measure the fies the addition of such features as au- with the tuner's ability to reject amplitude station's modulation level, which you tomatic scanning and station preselects, variations in the FM signal. This gives can use as a guide in setting modulation which are often found on such tuners. some indication of how well the tuner levels on your tape recorder when tap- There remain a few features and can cope with multipath interference, ing off the air. specifications which we have not listed. which causes such amplitude modula- Oscilloscopes show multipath, tuning Some, such as i -f rejection, were omit- tion of the FM signal. accuracy, modulation and signal level all ted because they are of little practical Multipath interference, created by the at once; such a scope is built into the significance to the listener. Others, such simultaneous reception of a signal and Sequerra Model 1; and many others as muting and stereo threshold, are not of several delayed signal echoes, is have connections for use with external listed consistently enough for us to cov- most troublesome in cities and in moun- scopes. The Sequerra's scope also er them reliably. JANUARY 1978 57
AmericanRadioHistory.Com n the Black Q HOW FM
I . __- . . = T' NER W'IRK PART 2 The detector and modulation/ demodulation circuits. BY JULIAN HIRSCH
LAST MONTH, in first modulating signal from our Sound Tech- o the part of this article, we discussed the basic prin- nology Model 1000A signal generator ciples of frequency modulation and with a 2000 -Hz external signal used to Performance, beauty, quality started dissecting the "innards" of an 100% modulate the left channel. The FM tuner by examining the front and the frequency scale is 5000 Hz/division, - three attributes that have i -f section. We continue here with the with the scan covering from 0 to 50 kHz. always been the hallmarks of detector section and stereo modulation The base band audio signal at 2000 Hz SAE products. SAE systems in and demodulation. can be seen at the left with a 0 -dB refer- the past have had them, this ence amplitude. The 19 -kHz pilot carrier system's predecessor had them, can be seen near the center, followed by and the new In The Black sys- The Detector. The ratio detector is the two difference sidebands spaced tem has them and much more. the most widely used circuit for convert- 2000 Hz above and below the 38 -kHz ing FM r -f to audio signals. The Foster - carrier. The latter is suppressed to about The 2900 Parametric Pream- Seely discriminator originally used in FM 54 dB below the difference sidebands. plifier offers our new flexible tuners has fallen into disuse. Quadra- The relative amplitudes of the base parametric tone control sys- ture detectors are sometimes found, band and subcarrier band signal levels tem, full dubbing and tape EQ. especially in lower -priced tuners that vary in a complex manner according to New phono and line circuitry use a single IC for i -f amplification, limit- the spatial distribution of the program. ing, and detection functions. It has results in unparalled clarity also But the general appearance of the signal the virtue of requiring only a single exter- that modulates the transmitter, and and definition with distortion nal tuned circuit, which simplifies align- which is recovered at the output of the of less than 0.01% THD & IM. ment. A little -used detector with a clear tuner's detector, resembles the spec- The 2200 Stereo Power Ampli- theoretical advantage is the so-called trum of Fig. 2. fier with fully complementary "pulse counter," which generates a Although this is one way to look at the short pulse each time the 10.7 -MHz i -f stereo signal, it is easier to consider the circuitry delivers 100 Watts signal voltage crosses the zero axis. signal as being created by a sampling RMS per channel from 20-20K These pulses can be created with a con- process at the transmitter. The left and at less than 0.05% Total Har- stant amplitude and duration so that the right channels are alternately selected at monic Distortion, from 250mW average value of a series of pulses from. a 38 -kHz switching rate, and the com- to full rated power. an FM signal follows the modulating, posite signal modulates the transmitter. waveform. This is the most linear type of Since the normal program bandwidth The 8000 Digital FM Tuner FM detector (it is bften used to measure does not exceed 15 kHz, this meets the has linear phase filters, phase - the inherent distortion of an FM signal) requirement that the sampling rate be at lock multiplex, and of course, generator) but it is rarely used in con- least twice the highest frequency in the our famous digital readout sumer products. Apparently its advan- program. The 38 -kHz switching signal tuning indicator system. tages are more theoretical than practi- does not appear in the output of the cal, due to limitations elsewhere in the switching system (except as the result Combine these products to- broadcast chain. In other words, a tuner of inevitable unbalance conditions). gether and you have a system with a pulse counter detector does not Hence, it is divided down to 19 kHz, after that ensures superior perform- necessarily have less distortion than which it is transmitted with the audio and ance in all areas, excellent one with a more conventional circuit. subcarrier programs as a pilot carrier. control flexibility, and the sonic There are several ways in which the quality that is typically SAE. Stereo Modulation/ Demodula- composite detected signal can be sepa- tion. Earlier, we referred to the spec- rated into its left and right channel com- trum of a stereo FM signal as having a ponents in the tuner. Basically, tuners 38 -kHz double-sideband, suppressed - use the 19 -kHz pilot carrier to either syn- Scientific Audio Electronics, Inc. carrier component that contains L - R chronize or generate (as by frequency P.O. Box 60271 Terminal Annex, Los Angeles, CA 90060 program information. Figure 2 is a spec- doubling in a full -wave rectifier, or trum analyzer display of the composite through a PLL) a 38 -kHz demodulating CIRCLE NO. 44 ON FREE INFORMATION CARO 58 POPULAR ELECTRONICS
AmericanRadioHistory.Com carrier. It is imperative that this signal be higher frequencies) by at least 30 dB. terference. When a signal is reflected to in -phase with the 38 -kHz switching sig- Such filters can be made, but they are the tuner over several different path nal at the transmitter, since an error of a relatively complex and costly, and most lengths, the various components arrive few degrees can seriously degrade tuner manufacturers use simpler filters with random phase relationships. The channel separation. whose responses begin to roll off above result is a partial or total cancellation of In a switching demodulator, the com- 10,000 or 12,000 Hz and may be down 2 some of the frequency components of posite signal is sampled by the 38 kHz or 3 dB at 15,000 Hz. This is responsible the FM signal. This appears to the tuner waveform, which reverses the process for some of the subtle differences some- like a severely distorted amplitude mod- employed at the transmitter and sepa- times heard between tuners. In a few ulation of the signal. To the extent that rates the composite signal into left and deluxe tuners, a switch allows the low- the FM detector is able to respond to right channels. In a matrix demodulator, pass filter to be bypassed at the user's amplitude modulation, the audio output the composite signal is first separated option, giving a flat high -frequency re- from the tuner will be distorted by the by filters into the base band (up to sponse (and with no ill effects, if neither multipath condition. 15,000 Hz) and the subcarrier band (23 Dolby processing nor tape recording is The most effective way to deal with to 53 kHz). The latter is detected in a involved). the multipath problem is to use a direc- balanced modulator, where it is hetero- tional antenna, oriented to favor one dyned with the 38 -kHz signal. The out- Other Features. The multiplex de- component of the arriving signal (prefer- put of the modulator is the L - R pro- modulator uses the 19 -kHz pilot carrier ably the earliest arrival) over the others. gram (the base band contains the L + R in the received signal to operate a stereo The AM resulting from the multipath program). The two are then combined in indicator light. In the absence of the 38 - condition, and its distortion, will be re- a resistive matrix that adds and sub- kHz signal, the internal oscillator is disa- duced, depending on how "selective" tracts them to derive the left and right bled and the detected signal passes un- the antenna is. If the distortion is not se- program channels. changed through both channels of the vere, it may not always be heard in an Following separation, each program demodulator and goes to the amplifier easily identified form. It is useful, there- channel is individually deemphasized to as a mono signal. A control voltage from fore, to have some indication of the mul- compensate for the 75-1.1,s preemphasis the tuner's limiter 'also disables the 38 - tipath condition as an aid to orienting the used at the transmitter and usually kHz oscillator when the signal is too antenna. passes through a low-pass filter to re- weak for noise -free stereo reception. For some years, this has been offered move any residual 19- or 38 -kHz signal The stereo/mono switch on most tuners in the better tuners and receivers in the components. These cannot be heard does the same thing, under the listener's form of external oscilloscope jacks. The because the tuner's deemphasis re- control. horizontal output is taken from the de- duces even the 19 -kHz component to Interstation noise muting is often con- tector, so that it represents frequency greater than 20 dB below the 100% trolled by the same signal -derived volt- deviation with the channel center locat- modulation level. However, even at that age that operates, the stereo switching ed at the center of the CRT screen when level, the 19 -kHz signal can interfere circuit. In some tuners, multiplex IC's á station is correctly tuned. The vertical with the operation of a Dolby circuit, contain muting circuits, while in other output, taken from the limiter, is propor- which interprets its presence as signify- tuners, the muting voltage acts on the tional to the amplitude of the signal as it ing high -frequency program content and limiter IC. A preferable system, used in a reaches the limiter section of the tuner. The display traces the i -f passband of alters its frequency response according- few tuners, is to . combine the signal ly. With some tape recorders, it is also sensing voltage with. the detector output the tuner on the screen if there is no possible to have harmonics of the pilot so that the tuner "un -mutes" only when multipath distortion present, showing the carrier beat with the bias oscillator, giv- a signal is sufficiently strong and when it peak deviation of the signal and whether ing rise to "birdies." is tuned with sufficient accuracy for low- it remains within the tuner's linear re- Ideally, the low-pass filter should have noise, low -distortion reception. sponse region. Any amplitude modula- a flat response to 15,000 Hz but should Perhaps the most serious cause of tion present in the signal appears as rip- attenuate 19 -kHz signals (and those at distortion in FM reception is multipath in - ples on the top of the trace. (The anten- na should be oriented to give the smoothest and most nearly horizontal display.) In many cases a meter is used as a multipath indicator. Usually the signal strength meter can be switched for this purpose. The exact mode of operation of the multipath meter differs from one Fig. 2. Spectrum analyzer display manufacturer to another, as does effec- of composite stereo tiveness. Typically, the meter "kicks" on modulation, with program modulation if AM is present, so 100% modulation that the antenna can be adjusted for the at 2000 hertz. steadiest pointer indication. Most meters are not sensitive enough to show up moderate amounts of multipath that would be instantly visible on an oscillo- scope; fortunately, this level of distortion is not often disturbing to the listener. O
JANUARY 1978 59
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Using Existing House Wiring for Computer Remote Control
PART 2
How to build a typical remote.
BY DAN SOKOL, GARY MUHONEN, AND JOEL MILLER
LAST MONTH, we described the the- discuss some software to get the com- How It Works. The user determines ory and construction of an Intelligent posite system "up and running." which remote he wishes to communi- Remote Controller that utilizes a build- The basic block diagram of a remote cate with and what command he wishes ing's standard ac wiring for communicat- is shown in Fig. 1. Note that many sec- to issue. For example, if he wants to tog- ing between a computer and appliances. tions of the remote resemble their coun- gle remote 41, a 233 must be outputted In this concluding part, we cover the de- terparts in the controller because both to the controller output port. The com- tails of a typical two -channel remote unit devices can send and receive data over puter then executes the assembly lan- (sometimes called just a "remote") and an ac power line. guage command OUT 5. (5 is the num-
60 POPULAR ELECTRONICS
AmericanRadioHistory.Com +15V +5V -12V -I5V
t t 1 DATA AC FILTER, INTERFACE AMPLIFIER DATA/CLOCK UART AND LIMITER RECOVERY RECEIVER POWER SUPPLY (FIG 3) (FIG 41 (FIG 51 AC LINE (FIG 21
ERROR JI 16 DATA PIN 4 (FIG 4) STATUS
CLOCK 7
POWER UART POLL ADDRESS DRIVER TRANSMITTER DECODING (FIG 2) (FIG 5) LOGIC J r POWER TOGGLE TOGGLE SOCKETS "B" TRANSMIT DATA RELAY
STATUS LOGIC PUSHBUTTON OVERRIDE
L CONTROL LOGICGIC (FIG 6) J
Fig. 1. Block diagram shows similarity of remote to last month's main controller.
ber of the output port while 233 is data.) mands. Each remote contains two inde- output from the loop is divided by 16 and The I/O port decoding logic on the con- pendent channels, each capable of con- used as the clock for the internal UART. troller board determines that the con- trolling one external device plugged into The received data is recovered at the troller is being addressed with an output its power socket. This means that each lock output of the PLL, and this signal is instruction. The controller UART trans- remote is assigned two sequential ad- used as the input to the UART receiver. mitter then reads the data bus, formats dresses (selected by the user by putting When the receiver detects a data the word, and sends it out to the power jumpers on the remote board). word, that word appears on its eight par- driver as a serial stream of data bits. The signal received by the remote is allel output lines, along with error and The power driver impresses the signal coupled through an ac interface adapter flag information. The address and de- on the ac line via the ac interface adapt- tuned to 50 kHz. A high-pass filter (roll- code logic then determines whether or er. The data appears on the ac line as a ing off at 6 dB per octave below 20 kHz) not that word is intended for that remote. diglltally modulated signal at about 50 removes the 60 -Hz line frequency and The three valid outputs from the ad- kilohertz. all its relevant harmonics. The filtered dress and decode logic are toggle -A, All the remotes are constantly moni- output is amplified and used to drive a toggle -B, or poll. The latter is actually two toring the ac line for possible corn- phase -locked loop (PLL). There, the vco commands -poll -A or poll -B-and the
CI,C2, C14, C15-0. 200-V capacitor PARTS LIST R25-200 ohms C3 -0.0I5 -1F capacitor R26, R28, R30-100,000 ohms C4,C5-0.001 -µF capacitor R27, R29-270,000 ohms C6 through CIO, C16, C17, C22 through C27, K1, K2-Spdt, 5-A contact -rating relay (Stan- RV I , RV2,-V33MA IA varistor (GE) C34-0. I -µF, 25-V capacitor cor MS64-931 or similar) S4SI-Spst normally open, pushbutton C I 1-0,39-11F capacitor Q I , Q2, Q4 -2N2907 transistor switch C12, C18, C19, C28 through C33 -0,01-µF, Q3, Q5, Q6, Q7 -2N2222 transistor TI ---Coupling transformer (see Note) 200-V capacitor Following: resistors ate 1/4 -watt, 5% unless oth- T2 -25-V CT 180-mA transformer C20, C21 -470-µF, 25-V electrolytic erwise noted: VR I-7805 5 -volt regulator Di through D5, D10, DI 1-1N4148 R 1-15,000 ohms VR2-79L12 - I2 -volt regulator D6 through D9-IN4001 R2-3900 ohms Misc.-In-line fuseholders (3), 117 -volt, Fl --114-A fuse and holder R3, R13, R17, R18, R19, R23, R24--1000 chassis-mount ac sockets (2), line cord, F2,F3-5-A fuse and holder ohms suitable enclosure, mounting hardware, etc. ICI-TR 1602 UART R4, R I 1-2200 ohms Note: The following are available from Moun- IC2, IC3- 4069 CMOS hex inverter R5, R6-10,000 ohms tain Hardware, Inc., P.O. Box 1133, Ben IC4,IC8 4001 quad 2 -input NOR gate R7, R8, R9, R20, R2I, R22-3300 ohms Lomond, CA 95005 (Tel: 408-336-2495): IC5-401 I quad 2 -input NAND gate RIO -39G ohms TI (MH-T1) for $6.00; complete kit for.one IC6-74C107 dual JK flip-flop R 12-27,000 ohms dual -channel remote including walnut case IC7-74C30 8 -input NAND gate R14-1800 ohms for $99. IC9---74LS93 4 -bit binary counter R15 -1000 -ohm, 10 -turn trimmer potentiom- Diodes are identified by letters"CR" and IC's ICIO, ICI I-NE535 op amp eter by letter "U" in parts placement guide in ICI 2-NE567 PLL tone decoder R 16- I 0 ohms Fig. 7.
JAWUARY 1978 61
AmericanRadioHistory.Com +15V UNREG 2 FI I/4A +5V
I17VAC C6,CIO,C16,C17, C22,C23,C25,C27
C7,C26 .IyF
12V
CI .IyF FIG 3 TI C4. I5V UNREG (INPUT) +15V
RI8 C3 1K .015y F R19 R20 03 C2 3.3K 3.3K FIG 4 -MANMA-.%,2N2222 , .IyF FREDTRANS PINIC2 12 R21 3.3K DART FIG 5 --~DATA ICI OUTPUT PIN 25 C14 R16 D3 1011 1N4148 j 02 1 , Fig. 2. 2N2907 Ac interface consists of Ti to drive remote receiver and three RV2 I I 1 transistors drive ac line 1VLI that the for R17 sending data back. Also shown is the IK dc power supply for the remote. ISV status logic determines which of the two (on or off), while the seventh bit is set to Tránsformer T2 and its associated com- is acted upon. zero to inform the system that a remote ponents provide regulated +5 and -12 A toggle command causes one of the is responding to the controller. This indi- volts. Other components provide the un- two flip-flops to change states. This cates to all other remotes that the digital regulated ±15 V required by the various opens or closes a relay associated with word on the ac line is not a command. circuits. that channel and controls the external The word is then formatted by the UART Transformer TI, resonant at 50 kHz, device connected to that socket. transmitter and sent via the ac interface provides the actual interface and isola- A poll command causes the status to the power line. tion from the ac line. logic to place a word into the DART transmitter buffer in accordance with the AC Interface and Power Supply. Filter, Amplifier, Limiter. This cir- following format. The first five bits of the This circuit (Fig. 2) forms the power sup- cuit (Fig. 3) operates in exactly the same data word contain the address of the re- ply to the electronic system and pro- way as its companion circuit in the con- mote channel being polled. The sixth bit vides the interface between the digital troller described last month. See the De- contains the status of the remote device receiver, the transmitter, and the ac line. cember issue for details.
R2 3.9K 10K Next month, Part 3 will +5V +5V C5 conclude this article with FIG 2, T1 .00I9F FROM A RIO final circuit discus- INPUT FIG 4 the AC INTERFACE 39011 C4 1C12 sions, construction and .00IjF C8 PIN 3 4 .I F C9 .IyF software. -12 V -12 V RVI R5 -/JJNJ- 10K R3 IK RI RII DI D2 15K 2.2K I IN4148(2)
+ 5V
FIG 5 IC2 R9 PIN 8 05 3.3K 2N2222 TEOC -JMI.Nv
R22 RCVR 3 .3 K. INHIBIT (CAL JACK PIN 3)
62 POPULAR ELECTRONICS
AmericanRadioHistory.Com ,
. Is is ' T © A brand new ... `- electronic home control center that will change your way of life.
You can automate your plug it in again anywhere. Its handsome digi- comfortable-no need to have them on con- home with the Coby 1 System. tal clock gives you the year, month, day, hour, stantly. You can change the times from your minute and second with accuracy to five sec- easy No Coby 1 Control plugs in anywhere to chair. mechanical timers; no wasted give you computerized ON/OFF con- onds per month. The calendar will show the power.. correct date until 2021. WE'RE INTRODUCING 1 trol over electrical devices in your We've protected Coby 1's sophisticated THE COBY home. brain with a handsome, precision -aluminum SYSTEM AT A SPECIAL LOW PRICE. We're anxious to get the first run It's the most sophisticated timer you package that is spillproof. Since Coby 1 has factory into can buy. It turns things on or off at no moving parts, it requires no maintenance. the hands of users as quickly as we can precise times, at the preset intervals because we're interested in how you put 1 work. you select, and can be programmed Coby to So until February 15, 1978, we'll accept advance orders for a Coby 1 up to 11 in months advance. Control at $399.00, the price to include a free It's an 1 instant control center for elec- n f` r ni e C n Coby 1 Remote. Other remotes will be extra. I-I -I LI L. _t4J 1 t trical devices right from your bed- ti' Simply fill out the coupon and send it with side-or wherever you and Coby 1 your check, money order, or credit card data. Control happen to be. You can also call in your order or get more Its elegant digital clock gives you the information by calling (505) 526-3358. We'll month, day, hour, minute, and sec- ship your Coby 1 along with full instructions and suggestions ond, with accuracy to within five on its use, after our first sec- IT'S FUN TO USE COBY 1. production run in January. We'll also include onds per month. Each Coby 1 Remote is assigned an identifi- our 90 -day parts -and -labor limited warranty. cation number. If the front hall lamp is Number COBY 1 CONTROL NEEDS NO WIRING WIiIO ENERGY TECHNOLOGY IS: One, you simply tell 1 -PLUGS IN ANYWHERE. Coby Control to turn The company Number One on or Tuesday, any was started by the three of us, The compact control panel, which we call off-now, Reece, day or every day, if you like. And if you've ever Brook Phil Reed, and Keith Burn. We Coby 1 Control, plugs into any ordinary wall developed the operated a pocket calculator, you'll have no system ourselves. We're ex- outlet, sending computer -coded pulses cited about Coby 1 problem whatsoever with Coby 1. because everyone we've through your present talked to has expressed real interest in the wiring. The pulses trig- product and sees a need for it. ger Coby 1 Remotes- COBY 1 IS AMONG THE We've been working on small remote switches GREATEST LUXURIES YOU CAN OWN. Coby 1 for months. Devel- to go between plug-in Picture yourself on a frigid winter morning. opment and testing of appliances and wall 't Coby 1 can wake you with your hi-fi system Production models is sockets. Soon (by and a lamp. now complete. They'll March) we will also You rise to a warm bathroom. When you be ready to ship in have Coby 1 Remotes come out, the coffee is ready to pour. Coby 1 January. to replace wall switches and Coby 1 Remotes turns the hi-fi off and the TV on, while you Dealer inquiries to take care of built-in appliances like water enjoy your coffee and paper. invited. Energy , heaters and air conditioners. It's safe, simple, Coby 1 has warmed the car engine for you, Technology, Incorpo- and sure. like it. s There's nothing so it starts readily and warms up quickly. rated, 1601 South A REMARKABLE APPLICATION At bedtime, with Coby Control now plugged Main St., P.O. Box O, BREAKTHROUGH IN in at bedside, you turn off all the lights and Las Cruces, NM 88001. (505) MICROELECTRONICS AND PULSE - switch off the TV-without getting up. You go Phone: 526-3358 CODE COMMUNICATION. to sleep knowing things will be ready for you (- again in the morning. If, during the night, you Mail to: The Coby 1 System' is the result of brilliant want engineering by a team of aerospace electron- to turn on the outside or living room light, you have the comfort and security of ics people. Coby 1 Control includes an Intel 8085 Microprocessor-a complete tiny com- being able to do so from your bedside table. Energy puter-plus control circuitry, power supply IT'S A CARETAKER electronics, coding and signal -generating cir- WHEN YOU'RE GONE. cuits, an emergency power cell, and memory. Now you can go away for ;Technology, Inc The memory contains 2048 words of low - a week (or a month) and 11601 South Main St., P.O. Box O. Las Cruces, NM 88001 me he power, programmable random access leave Coby 1 in charge. I for of first that memory (RAM) and 2048 bytes of read-only this s an advancewnone order, tand that shfmentiIp expected afterunderstand Consider a potential thief IJanuary 15. 1978. memory (ROM). It stores device numbers, watching your house: I Ship me one Coby 1 Control and one 10 -amp plug-in Cobyt commands, and status information for up to lights (Nos. 1-6) goon and Remote at the Special Introductory Price of 5399.00, ship - one hundred Coby 1 Remotes. off as if people were mov- I Ping included. $399.00 The coding and signal -generating hardware ing around. The TV (No. 7) I In addition, I want to order the following: translates commands and distributes them on; goes then goes off. more 10 -amp plug-in Coby 1 Remotes @ $39 95 through your home wiring (but without inter- Finally, the bathroom (No. I 25 -amp plug-in Coby 1 Remotes @ $49.95 fering with any of your other appliances) to 8) and bedroom lights (No. the Coby 1 Remotes, which decode the signals 9) go out. You can repeat I- Total New Mexico residents: and turn things ON or OFF. the pattern daily or vary I add Gross tax As you enter commands through the key- it please Receipt for up to a year in cycles I check BA/V Total board, the display lights up to confirm. It can as short as a second or as Money Order o Mc also be used to review commands stored in ong as 100 hours. Yet it will use less energy I memory. All programs are entered, stored, and suggest more activity than leaving lights ICard No.. and modified through 12 function and control or a radio on constantly. Card i No. Exp. date keys and a 10 -key numeric pad (plus AM and When you come home, Coby 1 can have the Interbank PM keys). house warm (or cool, in summer), the porch I snip to ITS ACCURACY IS BLACKOUT -PROOF. light on, the sofa lamp on, and the hi-fi on to I Power blackout? Built-in battery power keeps welcome you. Coby l's memory fresh. Unlike a conventional CONSIDER THE ENERGY SHORTAGE. (Address timer or clock radio, Coby 1's won't 1 clock lose Coby can do wonders for your electrical bill. I City State Zip a second. When power comes back on, the It never forgets to turn things off. It can turn I batteries automatically recharge. This feature car heaters, air conditioners, or electric heat- PE 1/78 also lets you unplug your control unit and ers on just far enough ahead to make things (Signature
AmericanRadioHistory.Com w-mum Solid State
By Lou Garner "FOR I DEPT INTO THE FUTURE ...."
THE WORDS in the title of this month's column are from buck) pocket calculators available from a number of sources, Lord Tennyson's famous poem, "Locksley Hall." Written even lower prices may prevail during special sales. In early in the mid -1800's, it contained some rather startling predic- Fall, fdr example, a major national department store chain of- tions: the invention of the airplane, air freight service, great fered 8 -digit LED "4 -bangers" for less than three dollars each, aerial battles, and, many feel, the formation of the United Na- with a limit of "two to a customer." tions, although he referred to it as "the Parliament of Man, Similarly, basic digital electronic watches, probably 3 -func- Federation of the World." tion LED types, retailing in the ten -dollar range. Another win-
Did Tennyson have the Gift of Prophecy? Did he receive ner! In last September's column, you may recall, I announced advice from noted scientists? Or was he just plain lucky in his that Texas Instruments, Inc. had cut the suggested retail price predictions? Perhaps none of these, perhaps a bit of each, but of their Model 503 sports/youth watches to a low $9.95. Since one thing is certain-long-range predictions always have then, a number of watch manufacturers have introduced low- been "safer" to make than short-term forecasts. priced models, with some types available for less than eight This explains, perhaps, why our annual guessing game with dollars during special promotions. the electronics industry is such a challenge. It's strictly a short Basic microcomputer kits for less than fifty dollars each in term proposition-one year! As always, we have a few predic- small quantities, greatly expanding their appeal to hobbyists tions for 1978; but, first, let's check the record for 1977. Some and experimenters. On target! In recent advertisements in of you may recall that, in my January 1977 column, I predict- these pages as well as in other electronics magazines, the Di- ed the following: gi-Key Corporation (P.O. Box 677, Thief River Falls, MN A drop in the price of simple pocket calculators to the "five - 56701) has offered a basic 8080A chip kit for only $49.95, dollar" range. Right on! Not only are five -dollar (give or take a plus handling. The kit includes an 8080A, an 8212, an 8224,
6 AMP 200 VOLT TRIACS
Fig. 1. Reader's circuit for ,dashing a string of lights.
64 POPULAR ELECTRONICS
AmericanRadioHistory.Com an 8338 and sixteen 2102-1's, virtually all the IC's required for a basic microcomputer. Naturally, you'll need a suitable pc board and support components. Commercial digital multimeters selling in the fifty -dollar, or less, price bracket. Check (if I'm allowed the customary 20% TRITEK, I NCORPORATED tolerance -otherwise, a close miss)! In a full -page advertise- VOLTAGEREGUTATORS ment in our June 1977 issue, page 33, Sabtronics Internation- INTEGRATED CIRCUITS 7805-C60812.1524 TO 220 95s 5/54.50 555 Timm 8 mineOIP 790106 08-111124 IU220 95r 5/54.50 pin 49 741 Compensated OP.Amp 8 pin DIP al, Inc. (P.O. Box 64683, Dallas, 781057..12. 15 4% 100 met SO< 27 TX 75206) offered a 31h -digit LM 18890 RF Video Modulator 78H05KC 5V SA 00J 9.15 7.45 CÁ3130 BipoHr/Mos-FET Amp 78H12KC 12V 5A T0.3 9.15 0p 1.19 CA3140 NOS ET Op Amp, Of DMM kit for only $59.95. On the other hand, if you're willing to 78H151CC ISV SATO3 9.15 polar out 99 Voltage Pulver 1.m3171( 1.5A AO/useabk 90.3 4.99 103909 Lo Led I.OS ).-M3911 Temp Control CHIP 1.50 Lm317T 1 SA Aauudok 80120 199 settle for a single -range DPM (digital panel meter), you can 19317MP .5A Ad/vaMbk 2.30 MCM 6571P Character TL430C Ad/rratable Zen, Trunk AIºuI /I LSO Generator 9.95 MCM6571AP Character T1497C SwiIchrng Reg & Inductor 9.50 Generator 9.95 buy one of these fully assembled, less power supply, for only MC14409P Telephone Rotary Puller RCA CA 3085 100mÁ Adjustable .60 10.98 MC144190 Touch Pad Converter for 14409 4.25 MC14411P $35.00 each in unit quantities and as low as in DIODES AND BRIDGES Baud Roe Generator 11.98 $29.00 each MC14412VP CMOS Modem Chip 16.95 00571095 Number CruncVer Micro IN4003 200 V 1 amo 12/51.00 ,895 74C9I5 7 Segment to BCD Converter quantities over 100 from Date! Systems, Inc. (1020 Turnpike ' 154004 400 V I amp 10/51.00 2.99 6414611150e. 740922 16 Key Keyboard Encoder 56.35 - 59n91 15/51.00 100/55.00 740923 0.600 115 V, 100 ',IA Hi 20 key Keyboard Encoder 56.45 Speed Signal 20/51.00 74C925 Street, Canton, MA 02021). If you prefer to assemble a.DPM D2131 200 V. 25A Stud 4 Decade Counter w/latches 1100 @ 74C926 4 Decade Counter w/carry D2135 400 V. 25A Stud SI 00 2.00 740935-1 3% D.glt D V M CMOS Chip 16.98 from a kit, you can purchase a 31/2 -digit LED kit for $24.95 or a 02138 800 V. 256 Secad 5115 032898 200 V. I60Á Secad Anode 55.85 50 V, 45Á Fa1t Recover, 039094 52.00 10007010 Precision 1.3%1 100 Reference Amp S.35 comparable LCD kit for $29.95 from any distributor stocking W4732647Á IW 5% Z,,,,, 4/51.00 100070 211 Extra Precise 1.05%I 10V Reference Amp 10.55 13 Assorted 810110 New 2,11.1 0.04.1 57.00 193990 Temp Stabilised tenor AF e 5003amp Epoxy O'l49 79s IODIC Active Filter. State Venable 7.50 Intersil products. 200V 30 amp Bodge 52.00 LM2907N Tachometer F/V Converter 3amp 2.65 600V Epoxy Bodge 51 49 15418125 Ul tr. sonic Transceiver 9.15 6000 ame A marked increase in the availability and use (lin- 3 SWO BHOge .89 LM1815 Adaptive Sense Amp for Tachometer 5.73 of analog u A7391 Motor Speed Control 4.95 MA 0030 30V DIAC 10/51.00 ear) MISCELLANEOUS devices. Still on target! Virtually every major semiconduc- TRANSISTORS RG.174 Minratum 5052 coax 50'/x.25 256718 90V. 15A PNP tor manufacturer introduced new linear devices (both discrete Ge 52 50 W51.1J0 Wire Wrap/unwrsp tool 5.95 15A PIMP 201557 30 V. Hr Gam Ge S2Á0 W50.30051041. Wry/unwrap tool 6.95 r 293414 Sat NPN 259..5A Le SI 12/51.00 BW 630 Battery Operated Wrap Tool 34.95 and IC) during the year and these are being used in ever in- 253734 300. I SA Fast Sw. NPN S 38 with any Wrap Tool - 293760 400. 1.5A Fast Sw..Lo Sa19NP Miniature SISO Square .05.Y1000 Monolithic Can 10/2.00 quantities by 20390s 40V..2Á LONoi,e NPN Si 6/51.00 creasing equipment manufacturers. RCA has 293906 400..2Á LONoisePNP Sr 651.00 I.C. SOCKETS 204125 30V, .2A LoNorte PNP S a/51.00 expanded its line of arrays (see this column in the October L. Profile Tm Solde, Tad Dip Sockets 295485 N Channel 1.8 et UHF Amp 69 ' 20548E Hr Conductance 205486 89 B pin 10/51 50 100/514.00 1010/S120.00 14 pin 1977 issue); TI is pushing its dual -technology BIFET line of 255861 HI Speed 50V 2A NPN Si 50 10/51.70 100/516.00 1000/5140 00 RCA 40673 Popular Dual Gate Mos91 1.10 18 pin 10/51.90 100/518 00 1000/5160.00 RCA 414093 Watt 9995, on Heat Sink 1.25 6.3 VCT, 1.20 operational amplifiers; Siliconix is making waves with VMOS a RCA 404103 Watt PIMP Si on Heat Sink 1.25 T,analorm0 Falo 2.49 Motorola MPSU.31 L.B. RF Fin0 12V. I A 1,6910,mer w4h 6' Powe, Cord devices (see our May 1977 column); and National Semicon- .99 2.88 ductor, Signetics, Motorola, Fairchild, and Delco have all ex- panded their lines of linear devices, with special emphasis on voltage regulators, audio amplifiers, operational amplifiers and special purpose devices. Minimum Order. USA, 510 tP I - t E k, 1171C. A breakthrough in solar -cell technology, leading to price re- Foreign, 515 in US Funds. 7508 11012th 27 \\,k Surface Shipping Prepaid. ductions of up to fifty percent in the dollar/watt cost ratio of so- IlIX../BAC 1 Add 501 insurance lar -powered electrical systems. A hit and a miss on this one! M ASTE R CHARGE/BAC (6021995-9352 SEND FOR FREE CATALOG. c There was a breakthrough in solar -cell technology when Mo- CIRCLE NO. 47 ON FREE INFORMATION CARD torola Semiconductor Products, Inc. entered the field with a new type of high -efficiency cell featuring a unique textured without my noticing it, I really bombed out on this prediction. surface to provide maximum light absorption, as reported in Interestingly, industrial and commercial interest in fiber-optic our October column. However, although the expected major applications continues at fever pitch, with a number of firms - reduction in solar -cell prices did not materialize, a recent offering fiber-optic "cable," connectors, and fittings, as well as sales bulletin from Poly Paks (P.O. Box 942, South Lynnfield, transmitter and receiver sub-assemblies and complete sys-
MA 01940) did offer a single solar cell with a rated output of 1 tems. But none of this seems to have filtered down to the hob- ampere at 0.5 volts for only $9.95! Prices are dropping, but byist level. In fact, the only fiber-optic projects I've seen of- slowly. fered to the experimenter are novelty lamp kits. The development of fast -response liquid crystal displays, paving the way for the eventual development of practical flat - Things to Come. Considering the result of my last predic- screen TV receivers. Check! Sparked by the increasing use of tion, I'm sorely tempted to swap my old crystal ball for a cup of LCD's in watches, clocks and digital instruments, significant tea leaves. But nonetheless, for 1978 watch for: developments have been made in the field, with response The introduction of ultrasophisticated solid-state games in- times reduced from a substantial fraction of a second down to volving a broader range of control -perhaps even voice com- the millisecond range. Although the microsecond response mands and audible responses (other than simple "sound ef- needed for television reproduction has not been achieved in fects"). Actually, the possibilities for game designs are virtual- commercial units, it is possible to build slow -moving displays ly unlimited, given a large enough market, and, eventually, with off -the -shelf LCD's today. Progress is continuing, how- each designer and manufacturer will try to "out -do" all others ever, and many scientists doing liquid crystal research seem to maintain a competitive edge. to feel that flat -screen TV LCD's are "just around the corner" Along with the introduction of more sophisticated µP -based (although none will vouchsafe which corner). video and nonvideo games, substantial reductions in the Increasing sophistication and complexity in solid-state video prices of conventional games. It would come as no surprise if and calculator -based games. A super winner! For confirma- a basic "table tennis" type game for B/W receivers were to be tion, refer to the editorial by Art Salsberg which appeared in offered in the ten -dollar range before year's end, with complex last September's issue -or you could just check any major programmable video games in the $50 to $100 range. department store or large mail-order firm's catalog! The development of a new solid-state microwave device. Solid-state/fiber-optic control and/or communication pro- The details are fuzzy, but the device may be a unit capable óf jects and kits for experimenters and hobbyists. A clear miss! challenging the long reign of TWT's . . . or it might be a FET Unless a press release, advertisement, or flyer slipped by with substantial power output in the GHz range.
JANUARY 1978 65
AmericanRadioHistory.Com The introduction of solid-state portable security alarm sys- Any of several operational modes can be selected by tems. Portable, self-contained, fool -proof, and difficult to de- means of three -position switch S2. With this switch in its ALL feat, which business travelers, tourists, and campers can use ON position, the one-shot inputs are all grounded, forcing their to protect a motel or hotel room or, perhaps, even a tent or outputs high and switching all three LED's on, thus activating camper -trailer. the Triacs and furnishing line current to all lamp loads continu- The development of a new type of solid-state sensor or ously. The ALL ON position is used both for general illumina- transducer. A number of new devices are needed in this area, tion and when the operator wishes to identify any burnt out for often the measurement or control system is superior in lamps. In the ALL ROTATE position, S2 applies Vcc to the one- performance to the device used to interface with the rest of shot trigger inputs, permitting the circuits to cycle on and off the physical world. sequentially and creating an optical rotation effect as lamp The development of a new family of logic devices. For some loads "A," "B," and "C" are switched on and off in order. Fi- time, now, TTL has been "King of the Mountain," even though nally, with S2 in its ALTERNATE position, the free -running mul- challenged by l2L, low -power Schottky, and CMOS. The new tivibrator (IC1A) serves to switch the one-shot trigger inputs family may be an adaptation of an existing technology, such alternately between ground and Vcc, causing the lamp loads as VMOS, or may represent a completely new concept. It's all to "rotate" for a half period (about 2 seconds) and then stop a bit misty. for a half period, repeating the cycle over and over. Dedicated home computers-not kits-in the $200.00 price With cost a critical factor, Jim used inexpensive, readily range. Regardless of what the optimists believe, I can't visual- available components in his design. As indicated earlier, the ize home computers as a mass market item unless the pro- IC's are type 556, while the Triacs are 200-V, 6-A types; any gramming problem can be solved. Most people - other than commercial units with these ratings should be acceptable. hobbyists - look for products which save time, work and ef- The optocouplers are home-made, with each consisting of a fort. And mental work (i.e., programming) is the toughest of "jumbo" red LED, a small CdS photocell, a piece of heat - all. Therefore, means must be used to greatly simplify or elimi- shrink tubing for assembly, and a dab or two of black paint. nate this task if computers are to achieve widespread public Except for the potentiometers, which may be either Trimpots acceptance. . . And, generally, this means a "dedicated" or small volume controls, all resistors are standard 1/2 -watt computer-one designed to perform a specific series of tasks types. The electrolytic capacitors, identified by a polarity sign, with a minimum of input data. are 20 -volt units, while the other capacitors may be either low - The introduction of dual -technology IC's (not BiFET's, which voltage ceramics or small tubular paper or plastic film types. are now available) but devices combining digital and analog The bridge rectifier used in the dc power supply can be either (linear) circuits in a single package, if not on a single chip. a standard bridge assembly or four diodes with (at least) a 36- There is an increasing need for devices which can operate in PIV rating and minimum 500-mA current handling capacity. both the linear and digital domains without costly A/D and Finally, power switch S1 may be a toggle, slide, or rotary spst D/A converters. Where there is a need, someone will find a unit, while function switch S2 is a single -pole, three -position suitable solution. lever or rotary type. Since layout and lead dress are not overly critical, the Reader's Circuit. Searching for an attention -getting dis- flasher circuit may be assembled on pert board using point-to- play for their popcorn stand, the members of a local Jaycee point wiring or on a suitable pc board, at the builder's option. club in Michigan looked at several ideas. Someone suggested Heat sinks should be provided for the Triacs if they are to be a movie -style marquee with rotating lights. All agreed it was a loaded to near maximum ratings. All dc polarities must be ob- terrific idea but, unfortunately, too costly for the budget, inas- served, or course, and the assembled circuit should be dou- much as these displays required a motor -driven, heavy-duty ble-checked for accidental shorts, opens, and wiring errors sequential switch to activate the multiple lamp strings in order. before power is applied. When connecting the load lamps, Then one of our readers, Jim Harvey, WB8NBS (15026 Sun- which are wired in parallel within each string, make sure that bury, Livonia, MI 48154), tackled the problem. Applying his in- Triac maximum ratings are observed. While the 6-A Triacs genuity and doing a little research with Signetics Application can handle almost any standard 120-V incandescent lamp, Notes, Jim decided he could do the job electronically using the greater the number of lamps, the better the overall optical solid-state circuitry and a combination of "junk box" and low- effect, hence low -wattage bulbs (71/2-W units or even 120-V cost surplus components. His circuit, capable of flashing up to Christmas tree strings) are preferred to permit a maximum three strings of lamps, is illustrated in Fig. 1. Jim writes that number of lights within each string without overload. Naturally, his total cost (exclusive of lamps) was a fraction of the $75.00 the lamps in each load string should be arranged in alternate
price asked for a motor -driven sequential switch. patterns to achieve the desired effect . . . A -B -C -A -B -C -A -B- Jim's design has a pair of 556 dual timers, ICI and 1C2, C, and so on. Jim offers the following hints to insure optimum three simple opto -couplers, and three medium power Triacs, performance: which serve to switch the (lamp) loads. Dc power is obtained (1) Since the one -shots require an initial trigger to begin cy- from a simple supply comprising a 12.6 -volt step-down trans- cling, the circuit may not operate if S2 is in its ALL ROTATE po- former, a bridge rectifier, and a 250-µF, 20 -volt electrolytic ca- sition initially. In this case, switch S2 to the ALL ON or ALTER- pacitor. The Triacs are isolated from the control circuit by the NATE position momentarily before switching back to the ALL opto -couplers. Three of the timer IC sections, IC18, IC2A, and ROTATE position. IC2B, are wired as one -shots, inter -connected through RC dif- (2) Once the display is operating in the ALL ROTATE mode, ferentiating networks so that they trigger each other sequen- "tweak" each one -shot's potentiometer until equal on times
tially. The remaining timer section, ICIA, is connected as a are achieved for each load string . . . or simply until the ef- free -running multivibrator with about a 4 -second period. It is fect is pleasing when viewed from a distance. used in one mode to control the sequential circuits for special (3) Finally, switch S2 to the ALTERNATE mode and adjust lighting effects. IC1A's potentiometer for the most eye-catching display. O
66 POPULAR ELECTRONICS
AmericanRadioHistory.Com will advance to the next address if you apply a single clock pulse. The best way to do this is to slow down the clock to IV* about one pulse per second by adjusting Experimenter's the one-megohm potentiometer and dis- connecting the clock input from pin 14 of the 7490. To advance the pointer to the Corner next address, simply touch the clock il 0 lead to pin 14 of the 7490 long enough By Forrest M. Mims for the clock LED to flash one time. After you learn to advance the 7490 in READ/WRITE MEMORIES (RAM's), PART 2 single address increments, you're ready to load data into. the RAM. Set up the data by grounding the input pins that are N LAST month's column we dis- scribed in last month's column? If so, to be at logic 0 and leave floating the in- 1 cussed the 7489 RAM, a TTL chip that you've probably learned a fair amount puts that are to be at logic 1. You can can store up to sixteen 4 -bit words. This about working with bipolar (TTL) RAM's. use switches or jumpers to load data. month we'll complete our experiments If not, you might want to consider retriev- Momentarily grounding the 7489's WE with the 7489 and get to know the 74193 ing last month's POPULAR ELECTRONICS input (pin 3) will load the data word into 4 -bit counter. and collecting the necessary parts. You the selected address slot. The word that First, let's cover a few facts about the can buy 7489's for as little as a couple of was previously in the selected address 7489 we didn't have room for last month. dollars or so from suppliers who adver- will be lost. After the word is loaded, We already know that the 7489 is a tise in this magazine. you're ready to move on to the next ad- RAM, that is, a random access, read/ dress. Remember, you're using a 7490 write memory. But did you know you can Programming. Let's discuss pro- decade counter for an address pointer. also think of the 7489 as a string of six- gramming procedures for the RAM dem- That means you can select only the first teen 4 -bit latches? Each storage ele- onstrator. Programming is semi- ten (0000 through 1001) of the RAM's ment in a 7489 is a latch flip-flop, so it's automatic since the 7490 address point- sixteen addresses. a perfectly valid way of describing the er (see Figure 4 in last month's column) If you want an easy way of knowing 7489. ADO.._ 55 PO/N TER D,9TAO LO/iDE.Q Thinking of the 7489 as a string of 4 - OFTH O[/T bit latches is a good way to better ap- A this important TTL memory preciate T chip. How would you like to make your 74,89 own 7489 from a handful of 4 -bit CUUN7ER RAM CO UNTE,Q latches? I don't think you would. Be- ,OooREss sides the latches, you would need a de- /N coder chip and some gates. ENhd ,-E RAM Demonstration Circuit. Did data loader. you build the RAM demonstrator de- Fig. 2. Block diagram of pseudo -random t5v
62011- 62o 62011 m,.inu RI / D cLOCK2 /M ,CLOGttE0 LED '44 1(
/3 74,89 74,90 7490 ADDRESS /w ó /y 5- POINTER C 007es 55 / 3 c1-0 3 ¿I H C..HVERATOR S/ S /0 /0- B .53
/2
131,1 jIo [31 21 3 6 71 1/o
74 90 / B 9 /.L P/N NuM6ER 5 lE"Sl; OPGN= D/SPLAYOATq CLOSED = wR, E NEW OATq Fig. 1. Circuit indicates address pointer output. Fig. 3. Automated RAM demonstrator with pseudo -random data generator. JANUARY 1978 67
AmericanRadioHistory.Com ..
"aa: lj exactly what address the 7490 is point- First, the RAM will accept (write) new ing to, connect LED's and 620 -ohm se- data from the data loader when S2 Includes ries resistors between the four 7490 out- (WRITE ENABLE) is closed. Otherwise, Functional AEI puts (pins 11, 8, 9, and 12) and plus 5 the RAM will continue to store any exist- Be Tilt Stand! Q e volts. sure to arrange the LED's in ing data. Second, both Si and S3 the proper sequence (Fig. 1). should be closed when you want to load You don't really need to know to which pseudo -random data, unless you want address the 7490 is pointing if you let it all the RAM addresses to contain the NEW EICO ?JO recycle to address 0000. Then you can same number. (In that case, leave S3 off 3% DIGIT DMM KIT simply load ten words, one at a time, us- after the data loader reaches the num- ing the programming procedure outlined ber you want to store in each address.) ONLY 7995 above. Third, remember to turn S2 off when Introductory Offer-FREE AC ADAPTOR How do you know when the 7490 is you want to read out the contents of the pointing to 0000? The pointer LED is on 7489 with the help of the four The first and only lab accuracy por- output table DMM Kit featuring MOS/LSI when the D bit in the address is logic 0 LED's. The LED's will be blanked (off) IC economy and reliability. Mea- and off when it is logic 1, as shown: when S2 is on and data is being loaded. sures DC/AC Volts, Kilohms, DC/ Finally, be sure to experiment with AC milliamps in 21 ranges. Polarity the indicators and overload protection Decimal Address pointer Pointer settings of both R1 and R2. Decreasing are provided, and 0.5 inch LED dis- count the effective resistance of R2 increases plays give easiest -to -read digital (7490 output) LED the count rate of the 7490, readout to 1999. The 270 features a and this will basic 0.5% DC accuracy, 10 Meg - DCB A 5 /NPvT i/CC ohm input impedance, low voltage 0 0 0 0 0 On drop in all current ranges and auto- 1 0 0 0 1 On matically -flashing overrange indi- B OuTPuT A /NPuT cator. Assembled $109.95 A OUTPcIT C L E.A.K
FREE '78 EICO CATALOG CcriNT Do.pN BoRRow Check reader service card or send 75¢ 8 1 0 0 0 Off for first class mail. See your local EICO GouNT uP CAR/Z7/ Dealer or call (516) 681-9300, 9:00 0 1 0 0 1 Off a.m.-5:00 p.m. EST. Major credit cards accepted. C OUTPUT L OA D EICO-108 New South Rd47E/COL7 To find the 0000 address, slow the Hicksville, N.Y. 11802 clock down and watch the pointer LED. D ouTPuT C /NPl./T CIRCLE NO. 12 ON FREE INFORMATION CARD Eventually it will turn off for two clock G.vO pulses. As soon as it flashes on again, O /NP[/T disconnect the clock lead from pin 14 of the 7490. The RAM will be Fig. 4. 74193 pin diagram. +rif.0 ._..~ at address 0000 and you can begin programming. improve the "randomness" of the data o 111.1...IIM.1 loaded into the RAM. Similarly, lowering Expanding the Demonstrator. It's the resistance of R1 will speed up the _ easy to expand the RAM demonstrator address pointer and let you load new by adding an automatic, pseudo -random data in a fraction of a second. r, (p1 - data loader. The data loader is merely a Incidentally, be sure to slow down the decade counter that rapidly cycles be- address pointer with the help of R1 - - ,.... 7 y, tween 0000 and 1001 again and again. when you want to read out the data with ir The output lines of the counter are con- the LED's. only $35 nected to the data imputs of the 7489. Don Lancaster's ingenius design Whatever number is present when the Improving the Demonstrator. provides software controllable options 7489 is advanced to the next address is Since we're using a decade counter as including: loaded into the RAM. an address pointer, we can only gain ac- Scrolling Full performance cursor Figure 2 is a block diagram that shows cess to ten of the sixteen storage slots in Over 2K on -screen characters how the data loader is connected to the the 7489. You can remedy this by re- with only 3MHz bandwidth RAM. As you can see, the data loader is placing the 7490 address pointer (and Variety of line/character formats identical to the combination clock and the 7490 data loader if you want to load including 16/32, 16/64 .... address pointer that automatically ad- (1010 through 1111) with a 74193 4 -bit even 32/64 vances the RAM to its next address. The (0000-1111) counter. Figure 4 is the pin User selectable line lengths complete circuit diagram for the expand- diagram for this chip. TELL ME MORE! ed circuit is shown in Fig. 3, where the An important advantage of the 74193 ( ) Send instruction manual for the TVT-6 Kit data loader is literally a mirror image of is the CLEAR input (pin 14). In normal. with full operational details, $1 enclosed. the address pointer circuit. use, this input is grounded. Disconnect- Name. Since you already know how the ad- ing the ground clears the counter to Address: dress pointer portion of the circuit works 0000. The 74193 has lots of other fea- City: State: Zip- from last month's installment, there's no tures including carry, borrow, count up, need to describe the detailed operation and count down. Its count can even be ( ) SEND FREE CATALOG of the data loader here. You'll find a few preset to any ELECTRONICS, INC. desired value between operating tips helpful, DEPT. I -P 1020 W.WILSHIRE BLVD.. OKLAHOMA CITY, OK' 73116 however. 0000 and 1111. o CIRCLE 35 68 NO. ON FREE INFORMATION CARD POPULAR ELECTRONICS
AmericanRadioHistory.Com attenuator in the feedline to the receiver might help if you had separates, rather Hobby Scene/ , , than a transceiver. You might try asking the CB'er to back off on the modulation, or perhaps turn his beam so that you're off its side!
By John McVeigh SOUND VIA POWER LINE Q. Instead of running extension speaker wires, I'd like to build a unit that would sense the audio signal imply that he is not overmodulating his RECEIVER OVERLOAD over the ac wiring in my house. transmitter-which often occurs when a Another unit would pick up the signal Q. A CB'er about a half mile away power mike is abused. If there was se- at the wall socket and feed the signal from my house uses a beam antenna vere overmodulation, "splatter" would to a speaker. Do you know where I and a power mike. When he trans- appear on many channels. But the situa- can find suitable schematic dia- mits, he puts out a very strong signal tion sounds more like a case of receiver grams?-David Mast, Holland, MI. (about 30 over on my S meter), and overload. If his signal is very strong, it his audio is superb-no distortion at can cause distortion and/or override the A. The January 1976 issue of POPULAR all. However, he causes interference selective circuits in the receiver i -f and ELECTRONICS contains a construction to all the other channels. Sometimes, cause the automatic gain control to cut project that does exactly what you're in- the signals on the other channels back on receiver gain. The net result is a terested in. If you can't find that issue, drop in strength (the S meter drops reduction in signal strength on the chan- you can order a back issue for $1.50 (in- several S units) and my receiver gets nel you're tuned to. cludes postage and handling) from the very quiet. Why does this happen, There's no practical filter that could be Ziff -Davis Consumer Service Division, and is there anything I can do to my inserted in the transmission line and 595 Broadway, New York, NY 10012. radio to help stop the interference?- would be sharp enough to attenuate the Readers outside the U.S. can order Andy Gill, Carrollton, KY. undesired signal but not affect the de- back issues for $2.00. Copies are avail- A. "ou mention that the CB'er is putting sired one. If your rig has an r -f gain con- able for magazines from April 1974 out clean -sounding audio. This seems to trol, you could try backing down on it. An through the present issue.
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AmericanRadioHistory.Com Advanced Electronics
The hest way to qualify for top positions and top pay in electronics is obviously with college -level training. The person with such training usually steps more quickly into an engineering level posi- tion and is paid considerably more than the average technician who has been on the job several years. A regular college engineering pro- gram, however, means several years of full-time resident training-and it often means waiting several years before you can can even start your career. This, of course, is difficult if you must work full time to support yourself and your fam- ily. If your career in electronics is limited without college -level training, take a look at the advantages a CREI home o co e study program can offer you. 1. Convenient Training CREI brings the college to you. Through the convenience of home study, you receive exactly the same level of training you will find in any college or or our university offering programs in elec- tronic engineering technology. With CREI, however, you can "go to college" whenever you have spare time at home or on the job. 2. Specialized Programs career in With CREI, you enjoy the advantage of specialized training. That is, your pro- gram will include only those courses directly applicable to your career in electronics. We omit such courses as English, social studies and other sub- jects, which are usually required in e ec ronics resident schools. Therefore, with CREI, you move ahead faster to the more in- teresting and useful part of your train- ing. 3. Practical Engineering CREI programs give you a practical rea: is. engineering knowledge of electronics. That is, each part of your training is planned for your "use on the job." By CREI brings using your training, you reinforce the college -level training learning process. And by demonstrating your increased knowledge to your em- to you with eight educational ployer, you may qualify for faster ca- reer advancement. advantages, including special 4. Engineering Degrees CREI offers you a number of special arrangements for engineering degrees arrangements for earning engineering degrees at recognized colleges and uni- versities. You can earn college credit while you are taking your CREI pro- gram or apply later, whatever is best for your career plans. 70 POPULAR ELECTRONICS
AmericanRadioHistory.Com Career Training at Home
5. Unique Laboratory FREE Book Qualifications Only CREI offers you the unique Elec- There isn't room here to give you all of You may be eligible to take a CREI tronic Design Laboratory Program. This the facts about career opportunities in college -level program in electronics if complete college laboratory makes learn- advanced electronics and how CREI you are a high school graduate (or the ing advanced electronics easier and it prepares you for them. So we invite true equivalent) and have previous gives you extensive practical experience you to send for our free catalog (if you training or experience in electronics. in many areas of engineering, including are qualified). This fully illustrated, 80 Program arrangements arc available de- design of electronic circuits. No other page catalog describes in detail the pro- pending upon whether you have exten- school offers this unique program. It is a grams, equipment and services of CREI. sive or minimum experience in elec- better "Lab" than we have found in tronics. many colleges. And the professional equipment included in the program be- comes yours to keep and use throughout your professional career. Send for this FREE Book 6. Wide Program Choice describing - your opportunities CREI gives you a choice of specializa- tion in 14 areas of electronics. You can select exactly the area of electronics best and; CREI college -level for your career field. You can specialize in such areas as computer electronics, programs . in electronics communications engineering, micro- wave, CATV, television (broadcast) . engineering and many other areas of *` ,..,,s,..»o-l1.vse.vts,..wa+^W, \ "' rw , modern electronics. 7. Prepared by Experts r ' -'w - Y6 NUC%- Experts in industry and technical orga- , CATV pN0 fr 1NC\-UO\NG . nizations of government develop CREI programs. Each part of your training is G. developed by a recognized expert in that area of electronics. That means you get the most up-to-date and practical in- struction for your career. 8. Industry Recognition That CREI training is recognized by in- dustry and government is evident from the fact CREI provides training to ad- vanced technical personnel in over 1,700 technical organizations. Many sub- sidize the training of their employees with CREI. If there is any question about the advantages of CREI training for you, ask your employer or any engi- -7/0* neer to evaluate the outline of a CREI program for you. Other Advantages Of course, there are many other ad- vantages to CREI training. For ex- Mail card or write describing qualifications to ample, throughout your training, CREI's GI Bill staff gives you personal instruction for CAPITOL CREI programs each step of your program. And in are approved many industrial areas, both in the U. S. w RADIO for training of and abroad, CREI Field Service Repre- ENGINEERING veterans turd sentatives provide a number of impor- servicemen under tant personal services for your training INSTITUTE the G.I. Bill. and your career. McGraw-Hill Continuing Education Center 3939 Wisconsin Avenue Northwest Washington, D.C. 20016 Accredited Member National Home Study Council
JANUARY 1978 73
AmericanRadioHistory.Com displays and decoder/driver electronics. On transmit, the heterodyning signal from the receiver is shifted upward by 455 kHz to generate the on -channel car- Product rier frequency. This signal then goes to a aa predriver, driver, and r -f output -power amplifier. A multi -element output net- Test Reports work matches to 50 -ohm loads and mini- mizes spurious output responses to maximize the attenuation in the TV range. On "power up," channel 19, the E.F. JOHNSON VIKING 4360 REMOTE CONTROL most popular CB highway channel, is MOBILE AM CB TRANSCEIVER. automatically switched in. The driver and power amplifiers are -modulated by the audio section Features telephone -type handset and speaker interconnect box. collector in the receiver, where a compression cir- cuit provides automatic modulation con- trol. Transmit/receive transfer is via di- ode switches.
Laboratory Measurements. We measured a 0.55-µV receiver sensitivity for 10 dB (S + N)/N at 30% modulation with a 1000 -Hz test tone. The agc held the audio output to within 15 dB with a - 20 -dB r -f input change at 1 to 10 µV and - to 20 dB with an 80 -dB input variation at 1 to 10,000 µV. The squelch threshold 40 range was 0.7 to 200 µV. ..- . Adjacent -channel rejection and de- w" sensitization measured 55 dB. Image re-
jection on channel 1 was 12 dB and is gradually deteriorated to 5 dB on chan- IIHE 40 -channel Viking 4360 AM CB connect box, the transceiver's price nel 40. I -f rejection was greater than 80 transceiver from E.F. Johnson dif- $229.95. dB, and other unwanted signals were fers from other digitally frequency -syn- down a minimum of 40 dB. thesized, remote-contról mobile rigs in Technical Details. The receiver em- to a 455 -kHz The audio response at the 6 -dB points that it consists of three pieces. One is a ploys double conversion varied between 240 to 2900 Hz and 215 telephone -type handset, the second is a i -f, which is obtained by heterodyning -oscillator sig- to 3250 Hz, depending on the setting of main electronics unit that can be tucked the CB signal with a local in frequency the VOLUME control. Maximum sine - out of sight, and the third Is a small nal that is 455 kHz lower wave output at 10% THD measured 1 dashboard -mounted interconnect box than the input signal. The heterodyning the watt into 8 ohms. However, at the start that contains a 3" loudspeaker and signal is obtained by sum -mixing of clipping and with 12.5% THD, the out- numerical LED channel display. The output of the voltage -controlled oscilla- put measured 1.4 watts. handset assembly contains a small tor (vco) in the PLL system with a 5120 - Powering the transceiver from a 13.8 - speaker, VOLUME and SQUELCH con- kHz signal from a crystal -controlled os- volt dc source, we measured a transmit- trols, and up- and down -channel push- cillator. (The standard reference signal ter carrier output of 3.75 watts. At micro- buttons for switching to the various is also derived from the 5120 -kHz oscil- phone input levels 16 and 25 dB greater channels. lator.) The heterodyning signal is mixed than that required for 50% modulation, Other features found in this transceiv- down and digitally divided for a compari- the THD with a 1000 -Hz signal was er include: LED dimmer switch (off/dim/ son reference that is fed to the phase 11%, respectively, with the bright); external -speaker jack; non- comparator along with the standard ref- 3.5% and for modulation averaging a nominal 90%. switchable and (automatic noise limiter); erence to provide the error voltage The THD with a 500 -Hz tone under the speech compressor circuit; and a trans- the vco. same conditions was 6% and 24%. mitter output network designed to mini- The i -f selectivity is obtained with a greater than ± 5000 Hz from mize harmonics that can cause TVI. Op- lumped -constant, bandpass-coupled cir- Splatter the carrier was 60 and 55 dB down at eration is from a nominal 13.8 -volt dc, cuit. There are two i -f stages, a detector, +16- and +25 -dB levels. However, the negative- or positive -ground source. an audio anl, and an audio preamplifier splatter with a 2500 -Hz tone was nomi- The main unit measures 8%"W x following the r -f section. An IC that con- modulates nally only 40 dB down. Nevertheless, at 6/8"D x 27/é"H (21.9 x 15.6 x 7.3 cm), tains the output stage (it also maximum voice levels, the splatter was while the interconnect box is 41"W x the transmitter) rounds out the receiver and detector more than 60 dB down. The modulation 37/í;'H x 1"D (11.4 x 9.8 x 4.1 cm), section. An agc amplifier peaks held to just short of 100%. less mounting flanges. Supplied with system is included. The audio response measured 500 to handset and 8' (2.4-m) cable for inter- The channel -indicating system con- LED 4000 Hz at the 6 -dB points. Slight down - connecting the main unit with the inter - sists of the usual seven -segment POPULAR ELECTRONICS 74
AmericanRadioHistory.Com ward modulation (negative carrier shift) Either button can be operated momen- Although the modulation distortion at was noted during these tests. The out- tarily for single-step operation or held low audio frequencies measured some- put frequency held to within ±30 Hz, re- down for continuous (and fast) scanning what greater than usual at high com- ferred to +176 Hz on channel 21. of the channels. We determined that pression levels, the transmissions only a light tap of either button is all that sounded very good under most voice User Comment. The main electronics is needed to step through the channels. conditions. Additionally, adverse splatter package that makes up this transceiv- One must be careful here to press and was absent. The quality on receive was er's system can be mounted up forward quickly release the button to avoid going good, too. in a vehicle. Alternatively, it can be into the scan mode. As noted by our measurements, the mounted under a seat or in the trunk. The VOLUME and SQUELCH controls image rejection on some channels was The interconnect box is designed to be are thumbwheel types, located at the less than usual for a single conversion to installed on the dashboard or wherever right side of the handset. With a little a 455 -kHz i -f. its controls can be conveniently reached practice, one quickly becomes accus- The and was not especially effective in and its LED display affords an unob- tomed to this arrangement and the di- our rigid bench tests with an impulse - structed view. This box has a toggle rections in which the controls must be noise generator. However, in on -the - switch for turning on and off the power rotated to obtain the desired effects. road tests in our noisy vehicle, its perfor- and dimming the channel displays. The rationale behind the usual re- mance was very good indeed. Another switch permits the operator to mote -control CB ríg ís to have the trans- Overall, the Viking 4360 transceiver is select either the box speaker or the ceiver out of sight or in a safe place as a a most satisfactory performer. Of special speaker in the microphone's housing. theft deterrent. With this rig, however, importance is its user -operation con- The speaker in the box faces downward. mounting of the interconnect box is veniences. For example, the lightweight The handset connects to the intercon- somewhat revealing, though not on the handset can be held comfortably, partly nect box via a multipin connector at the order of conventional -type rigs. Even so, as a result of using a larger speaker in end of its heavy coiled -cord cable. locating the main section of the system the interconnect box instead of in the The speaker in the handset is located in the trunk should minimize the possibil- handset itself. Also, the slight compro- at the top of the housing, while the mi- ity of it being stolen. mise of having a third small unit-the in- crophone element is at the bottom. In Since the interconnecting, cable be- terconnect/speaker housing/channel the middle of the handset are two push- tween the box and main unit is just 8' display-makes it easier and safer for buttons, labelled PLUS and MINUS, for long, for trunk installations it may be the driver to view under typical motoring stepping through the channels in either necessary to obtain Johnson's optional situations. Lastly, the handset offers true an upward or a downward sequence. 12' extension cable. one -handed operation.
CIRCLE NO. 104 ON FREE INFORMATION CARO
SENCORE MODEL DVM37 DIGITAL MULTIMETER
Portable DMM boasts 0. I% dc accuracy, automatic zero and switch -controlled probe.
carbon -zinc or alkaline cells (four C size), rechargeable nickel -cadmium cells, or from an optional ac adapter/ battery charger. The Model DVM37 multimeter price is $248. Available as options are a No. 39G90 ac power adapter/battery charg- er for $9.95 and a No. HP200 50 -kV high -voltage probe clip -on for $25.
Technical Details. A total of 28 ranges is provided. Dc voltages can be measured in four ranges to 2, 20, 200, with THE MODEL DVM37 digital multime- direct measurements. The instrument is and 2000 volts full-scale an accura- cy of 0.1% (0.2% on the 2000 -volt ter from Sencore features a 31/2 - designed to permit resistance and ac 1 mV on the 2 -volt digit, 0.3" (7.6 -mm) high red seven -seg- and dc voltage and current measure- range). Resolution is is 15 meg- ment LED display, 0.1% dc measuring ments. range. The input resistance to 30 accuracy, and 15- or 30-megohm input The multimeter measures 7"H x 5"W ohms, which can be extended resistance to keep circuit loading and er- x 4"D (17.9 x 12.8 x 10.2 cm) and megohms via a switch on the built-in probe. Using this switch rescales the roneous readings to a minimum. Auto- weighs 2.25 lb (about 1 kg), including its matic zeroing, polarity indication, and. internal battery pack. Power for the ranges to 4, 400, and 2000 volts full- decimal -point placement provide for fast DMM can be from throw -away standard scale, with an accuracy of 1.1%. Ac re - JANUARY 1918 75
AmericanRadioHistory.Com Put Professional Knowledge and a COLLEGE DEGREE in your Electronics Career through jection is 60 dB at 50/60 Hz, and the in- ment's front panel can be used to turn put is protected to 2000 volts dc plus on the power for continuous operation HOME peak on all ranges. when desired. The second probe switch, There are four ac voltage ranges that labelled Iso DCV+2, provides an extra go STUDY . . up to 2, 20, 200, and 1000 volts full- 15 megohms of isolation for critical cir- scale. Accuracy on the three low ranges cuits where loading presents problems, is 0.5%, while on the 1000 -volt range, it as in oscillators, very -high -impedance is 0.75%. Measurements can be made CMOS circuits, and the like. Operating down to 1 mV on the 2 -volt range. The this switch not only adds isolation re- input Earn Your impedance is rated at 1.5 meg- sistance. It also doubles the measure- ohms shunted by less than 100 pF. The ment capability of the range on which it DEGREE frequency response is from 40 to 5000 is used, as mentioned above. by correspondence, while continuing your Hz ±0.5 dB. The average -detecting present job. No commuting to class. Study measuring system provides rms read- For at your own pace. Learn from and User Comment. our tests, we in- complete ings. Input explicit lesson materials, with additional protection is to 2000 volts stalled four C cells in the DMM. Then we assistance from our home -study instructors. peak and dc or 1400 volts rms. The five used our usual laboratory voltage and Advance as fast as you wish, but take all the ac and dc current ranges go to 200 µA, current standards and high -tolerance re- time you need to master each topic. Profit 2 mA, 20 mA, 200 mA, and 2 A full- sistors to check out the various functions from, and enjoy, the advantages of directed scale. Measuring accuracy is 0.3% on and ranges. In each but self -paced home study. case, the instru- do and 1.0% of reading plus three digits ment The Grantham electronics degree pro- performed comfortably within its on ac. Resolution is gram begins with basics, leads first to the rated at 0.1 µA on published specifications. A.S.E.T. degree, and then to the B.S.E.E. the 200-µA range. The internal shunt re- After completing our standard bench degree. Our free bulletin gives complete sistance on the respective ranges is tests, we put the DMM to work under ac- details of the program itself, the degrees 1000, 100, 10, 1, and 0.1 ohms. The tual in-service conditions for a month, awarded, the requirements for each degree, voltage drop is 200 mV on the three low- both on a service bench and in a field - and how to enroll. Write for Bulletin E78 . er ranges, 250 mV on the 200-mA service vehicle, taking Grantham no particular care College of Engineering range, and 1 volt on the 2-A range. The to treat it gently. At the end of the test 2000 Stoner Avenue input is protected up to 2000 volts do period, we could find not one fault in the P. O. Box 25992 and peak. instrument's performance or handling, Los Angeles, CA 90025 Resistance measurements can be based on combined bench and field ex- Worldwide Career Training thru Home Study made with either high or low power. The perience. In fact, we feel it was among CIRCLE NO. 17 ON FREE INFORMATION CARD high -power ranges (to 2 k, 20 k, 200 k, 2 the most convenient multimeters we megohms, and 20 megohms full-scale) have ever used for the full range of dif- deliver a 1 -volt maximum test potential ferent test and measuring conditions en- to the test probes. The low -power countered. ranges (200 ohms, 2 k, 20 k 200 k, and 2 At the end of the in-service test, we SAVE! megohms full-scale) deliver a 0.2 -volt again examined the DMM, both physi- test potential to the probes. is MONEY TIME FREIGHT Accuracy cally and electrically. The DMM easily rated at 0.2% ±3 digits on all but the 20- survived the rough of a Ih, QUALITY STEREO EQUIPMENT environment megohm range, where it is 1 AT LOWEST PRICES. 0.5%±3 dig- service van. When we performed ac- its. Resolution is 0.1 ohm on the 200 - curacy tests again, we noted no degra- jibl YOUR REQUEST FOR QUOTA- TION RETURNED SAME DAY. ohm range. Maximum current through dation from the results obtained in the
the 1 FACTORY SEALED CARTONS- resistance being measured is mA, original bench tests. GUARANTEED AND INSURED. I' 100 µA, 20 µA, 1 µA, and 0.11.1A on the We like Sencore's new approach to low -power SAVE ON NAME BRANDS LIKE: -ohms ranges and 500, 50, 5, test probes, particularly the switch that and 0.05 µA for the high -power ranges. allows us to control the power to the in- PIONEER SANSUI Input protection is provided to a max- right the probe KENWOOD DYNACO strument at body. The imum of 2000 volts dc and peak on all impedance and range doubling switch is SHURE SONY ranges. a nice touch that adds practical utility to MARANTZ KOSS The multimeter is made more useful the instrument. It greatly simplified our AND MORE THAN 50 OTHERS. by a permanently connected probe as- measurements under some very trying BUY THE MODERN WAY sembly, which consists of a flexible conditions. The body of the probe itself BY MAIL-FROM ground lead terminated in an insulated is triangular in shape, making it comfort- alligator clip and a signal lead terminat- able to handle and easier to manipulate ed in the actual probe tip. Because under actual measuring conditions than these test leads are a permanent part of is usually the case. the DMM, they cannot be misplaced. In sum, the Model DVM37 combines The special probe tip features two all the utility, accuracy, and human engi- Mini/audio touch switches. The one labelled PUSH neering one could expect of a well - ON turns on power to the meter for as designed digital multimeter. Its high - 12 East Delaware long as it is held down and instantly re- impact case and recessed control knobs Chicago, Illinois 60611 moves the power when released, which are particularly suitable for the rigors of 312-664-0020 saves on battery power. Of course, the .actual servicing conditions.
main power ON/OFF switch on the instru- CIRCLE NO. 105 ON FREE INFORMATION CARD
76 CIRCLE NO. 19 ON FREE INFORMATION CARO POPULAR ELECTRONICS
AmericanRadioHistory.Com addresses and reading or writing memo- ry. DMA I/O devices are also allowed to do these operations. In a system with DMA capability, the address lines must Computer Bits also have three -state capability. DMA is typically used by video display .....:.. and floppy disk subsystems. Both of these require data transfer at such a high speed that conventional program- controled input/output techniques are MSC not usable. In operation, a DMA device By Hal Chamberlin will temporarily stop the CPU and gain BUS SYSTEMS control of the bus for the duration of the ALL HOBBYIST computers have Both schemes make use of integrated data transfer. During this time, the full some kind of bus system for tying circuits having Tri-State® (National speed capability of the bus, which may the various computer elements together. Semiconductor), sometimes called easily reach 2 -million bytes per second, Component computers use a "mother- three -state, outputs which allow the out- can be utilized. When data transfer is board" which contains only the bus.con- puts of several IC's on different boards complete, the CPU is allowed to resume nected to a number of pc board sockets. to be tied onto the same bus lines. A normal operation. A couple of particular- Each component of the system such as three -state output can be in one of three ly sophisticated bus systems do not the CPU board or a memory board plugs conditions. Two of these are the familiar even stop the CPU during DMA opera- into a socket and communicates with the logic "0" and "1" states. The third is a tion. Instead, DMA transfers take place rest of the system over the bus. Even an disabled state in which the IC output es- between the "cracks" when the CPU is all -on -one -board system has a bus run- sentially disconnects itself from the bus not using the bus anyway. ning around on the board to connect the line. If only one of the three -state IC's CPU, memories, and input/output cir- connected to the bus line is enabled (in The Altair Bus. By far the most popu- cuits together. For expansion purposes, the "0" or "1" state) and all of the others lar bus system in use by hobbyists todáy the on -board bus is usually brought out are disabled, then the bus line assumes is the original Altair bus. Although usual- to the edge of the main board. the logic state of the enabled IC output. ly called the S-100 bus because of its Actually a bus sytem by itself is noth- Another group is the address lines. 100 lines, its popularity approaches ing more than a set of parallel wires. Generally only the CPU supplies ad- standardization. However, the fact re - These wires can be conveniently broken dresses, so frequently these are simply down into four major groups. The most lines driven by the CPU and received by basic is the power group which supplies other system components. operating voltages to the circuits tied to The last major group is the control sig- the bus. On some systems this may con- nals. These differ greatly in number and FREE! * sist of only two lines-one for +5 volts function among the various bus systems and the other for ground while others in common use; but in all cases they may have three separate power volt- control the response of various system !$41 ages, typically +15, +5, and -15 volts. components. Many of the control signals ----= --- Some systems may even distribute un- are called strobes. Their purpose is to s_' regulated power voltages on the bus ex- delay and qualify the response to an ad- pecting the individual circuits to regulate dress or data change until the logic lev- rFvr% TiK-t the voltages as required. Often several els on the bus are stable. This prevents } ---1/4 of the bus wires are assigned as a response to erroneous address and #t:; grounds in order to reduce the possibility data patterns caused by one bus line of ground loops. switching slightly faster than the others. The next major group is the data lines. Occasionally the data lines and ad- NEW CATALOG OF These lines carry binary data around to dress lines are multiplexed onto the HARD -TO -FIND the various sytem components. In most same physical bus wires. This is particu- PRECISION TOOLS data either flows from a periph- larly advantageous in 16 -bit systems systems, Jensen's new 144 -page catalog is jam- eral device or memory into the CPU dur- since 16 bus lines and associated sock- packed with more than 3000 quality ing a read cycle, or flows from the CPU et pins can be eliminated. In such a sys- items. Your single source for hard -to - to a memory or peripheral during a write tem, control lines indicate when an ad- find precision tools used by electronic widely has dress or data appears on the bus. Flip- technicians, scientists, engineers, in- cycle. One used bus system strument mechanics, schools, labora- 8 lines for carrying data from the CPU to flop registers on the various system tories and government agencies. This other system components and 8 more boards are used to remember the ad- popular catalog also contains Jensen's lines for carrying data into the CPU from dress while data transfer is taking place. world-famous line of more than 40 tool other components. Most other systems Often a bus system may have special kits. Plus 10 pages of useful "Tool Tips" to aid in tool for your lines for both pur- features over and above what is re- selection. Send use a single set of 8 free copy today! poses forming what is called a bidirec- quired to read and write memory or I/O tional data bus. This is allowable be- devices. One of these is called direct ©JENSEN TOOLS b[ ALLOYS cause none of the available micro- memory access or DMA. In a system 1230 SOUTH PRIEST DRIVE TERIpDE. AZ. 85281 processor chips can simultaneously with DMA capability, the CPU is not the A BLISS a LAUGHLIN ..au.r., 0 read and write. only subsystem capable of generating CIRCLE NO. 25 ON FREE INFORMATION CARD JANUARY 1978 77
AmericanRadioHistory.Com mains that MITS introduced it in early
. 1975 with its Altair 8800 computer. . . ti. L. ®8 "Erector Kit" Of the 100 lines, only 81 are actually assigned. Six lines are used to , Dp1110" . distribute COMPUTERTER +8, +16 and -16 volts, all rectified and SYSTEMM filtered but unregulated. Separate data - .:... in and data -out groups of 8 lines each ...,_-- 27,- ONLY constitute the data lines. Another 16 lines form the address bus. There is an unusually large complement of 43 con- trol lines; but they are not necessarily an advantage since they are provided in SEMI -KIT their raw, undecoded state. The bus timing and control functions are entirely dependent on the 8080 CPU ShVE. MP -200 n, for which the bus was designed. ,to90 "The Electronic Erector Set" 4E ' %, Ideal Kit For Amateur or Pro , E i. .1.1 However, when newer microproces- (ate All You Need Is a Screwdriver To sors such as the 8085 or the Z80 are in- reg Assemble m.,terns \gePae terfaced to the S-100 bus, true compati- trO °'c Boards Prewired Ready for Assembly 649 Into Cabinet bility with the original bus specification wt. lbs. , Shpg. 15 í' can only be attained by adding circuitry to "fake" the same timing and control V sequences as used by the 8080. Actual- SYSTEM INCLUDES: ly most peripheral board designs, partic- Olson 8 Computer MP 100 (below) 229.95 ONUS'akBo ularly static memories, can tolerate con- OA Panel elow) 9.95 808 ,ip with pur siderable variation in timing and control M Card -101 The; cro Procesorsl MP (below)120.00 o char; , P200 details and still operate satisfactorily. 1 K PROM Memory 95.00 chase of e However, more Dress Front Panel MP -103 (below) 15.00 ex -309 9.95 complex boards such as REGULAR SEPARATE ITEMS PRICE 649.90 VALUE floppy disk controllers and graphic dis- play interfaces may depend heavily on standard 8080 control timing. Thus, Factory Wired Version these more complex boards may not op- W/426 Page Bell & Howell Instruction Course erate correctly with a Z80 CPU board ._ Completely Factory Wired -Ready to Set -Up that does a poor job of faking 1.4111,\``a\_ jIJ_:_- j - Shpg. wt. 15 lbs. the 8080 control sequences. Control and timing is not the only sAUE source of potential incompatibilities among "standard" S-100 boards. Some MP -210 manufacturers have assigned their own functions to the 19 unused bus lines. Of reg separate 7, from puce MP -201 2 -Volume Bell 8 course, with only 19 to go 5 items around, not 0 Howell Instruc- 1079.50 8950 lion Course No everyone has assigned them to the Charge With VALUE MP -210 same functions. Nevertheless, the S-100 bus is the closest thing to a stand- SYSTEM INCLUDES: ard bus this industry has. Olson 8 Computer MP -100 (below) 1 K PROM Memory. Wired 125.00 Wired 450.00 Dress Front Panel MP-103 (below) ..15.00 Front Panel Display Control MP -102 . BeII 8 Howell Instr. Course MP -201 .89.50 Benton Harbor (Heath) Bus. (below) Wired 250.00 REG. SEPARATE ITEMS PRICE . 1079.50 Another bus structure that Micro -Processor Card MP -101 (below) has just been Wired 150.00 introduced with the announcement of the H8 microcomputer is the "Heath" electronics bus. Unlike the S-100 bus, this one was carefully planned with the benefit of 2 ® 260 S. FORGE ST. years hindsight of the DEPT. 1-7 AKRON, OHIO 44327 hobby computer market. Major differences are the much smaller number of lines, 50 instead of NAME 100, and more generalized control sig- ADDRESS nal assignments. CITY STATE 7IP The smaller number of bus lines and use of less expensive QTY. STX4 DESCRIPTION PRICE EA. TOTAL board -bus connectors greatly reduces the cost of a motherboard/bus system over the S-100 equivalent. Generalized control signals make the transition to POSTAGE newer processors more orderly. TAX Eight lines are used to distribute +18, TOTAL POPULAR ELECTRONICS
CIRCLE NO. 33 ON FREE INFORMATION CARD
AmericanRadioHistory.Com +8, and -18 volts, all unregulated. Four boards. One of these in effect converts address lines and 8 of which are control of these are grounds scattered among the KIM -1 bus to an S-100 bus and al- lines. Although slower than the typical the other signals to further reduce noise. lows all of the less sophisticated S-100 processor bus, it is much faster than a Although separate address and data boards to be used with a KIM -1 system. serial interface and uses full "hand- busses are used, the data bus is bidirec- shake" control signal exchange to pre- tional in order to conserve bus lines. The General Purpose Interface Bus vent data loss in the event a peripheral control signals are already decoded on (GPIB). All of the bus systems dis- device is unable to receive data. Data the bus into the basic 4 operations; cussed so far have been processor transfers over the bus are in the form of memory read, memory write, I/O read, busses. That is, they connect both mem- 8 -bit bytes and the control signals insure and I/O write. ory and I/O boards to the CPU. Al- that devices on the bus are ready to re- though they are very fast and relatively ceive or send data. Maximum bus length KIM -1 Bus. Probably the most popular simple to interface to, operational speed is about 16 feet, long enough to inter- "one board" microcomputer is the restricts the overall length to two feet or connect a table full of microcomputer 14 KIM -1. Although it has most of the sub- less. Running the parallel lines over a peripherals. A maximum of different systems needed for a complete system longer distance than this produces intol- devices can be addressed. is that already on -board, it also has a 44 -pin erable noise and crosstalk as well as a The significance of the GPIB edge connector which brings the CPU general slowdown of all signals. What the recently announced PET computer a connector bus out for expansion. While the busses this means is that all interface boards from Commodore has GPIB described earlier were all TTL busses, must plug directly into the bus in the on the back. Their plans call for interfac- con- capable of driving dozens of subsys- computer cabinet. Since input/output is ing add-on peripherals through this inside tems boards simultaneously, the KIM -1 usually done much more slowly than nector rather than adding boards itself. of the large bus is a "MOS" bus having limited drive memory access, it would be nice to have the computer Because capability. Using the signals raw, a max- a parallel I/O bus that can be run market expected for the PET computer industry imum of four expansion boards can be through a cable to a variety of peripheral and the fact that it is a formal driven and then only if they use "L" or devices. standard not dominated by a single "LS" TTL to connect to the bus. For One bus designed for just this pur- manufacturer, it is likely that the GPIB greater expansion capability, a "bus ex- pose is the General Purpose Interface will soon become the preferred standard pansion motherboard" can be used. Bus (GPIB), developed by Hew- method of interfacing peripheral devices This contains the typical parallel lines lett-Packard and adopted as a standard to a microcomputer. The familiar moth- and board connectors as well as TTL by the IEEE. The bus consists of 16 erboard bus may disappear as 16k and buffers to drive a large number of lines, 8 of which are bidirectional data/ 64k RAM chips make their appearance.0
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CIRCLE NO. 32 ON FREE INFORMAIION CARO
AmericanRadioHistory.Com soon see commercial ATIS modules of- fered by those companies presently manufacturing automatic identification systems for the General Mobile Radio Service and amateur radio repeaters.
CB Scene Your Electronic Fingerprint: The FCC has thus far proposed two methods of encoding the. information used as By Gary Garcia, K014178 identifier. Originally it was suggested AUTOMATIC TRANSMITTER IDENTIFICATION that the identifier be transmitted in ASCII format by audio, frequency -shift keying MANDATORY USE of automatic integrated. Oh our crowded channels, (AFSK) at a 100-báud rate. Using. this transmitter identification systems the functions provided by such an inte- method the identifier would be heard as (ATIS) was proposed (Docket 20351) in grated system will certainly be a valu- a one -second burst. The audio -frequen- early 1975 as a means of alleviating the able communications aid to CB'ers. cy tone used should not be over 4 kHz perplexing station identification problem so as not to exceed FCC bandwidth limi- and augmenting the enforcement efforts Methodology. The purpose of an eu- tations. In the first ATIS proposal, AFSK of the FCC. Two years later, .in Docket tomatic transmitter identification system between two tones of 1 115 and 1285 Hz 21137, the FCC again tendered the use is easily accomplished. A basic system is recommended. of ATIS, this time for possible use on a is shown in Fig. 1. The identifying infor- Most recently, use of Morse Code voluntary básis. Here are some of the mation is stored in ROM, and the trans- transmitted at a rate óf 25 words per features of ATIS and its possible impact mission of this identifier is regulated by minute has been suggested. On-off key- on the Citizens Band Radio Service. timer circuitry. The output of the merhory ing of a 750 -Hz tone would be used is converted from parallel to serial form here. The time required to transmit the Benefits. There are many benefits to before being fed into an audio -frequency identifier in this format is about five sec- be gained by CB'ers through the use of tone generator. Finally, the audio -fre- onds. Currently, the EIA is working .to ATIS. Extensive application of ATIS will: quency tones are input to the audio -fre- standardize the format of signalling used Promote rules. compliance, making for quency amplifier of the transceiver. in selective calling systems. It would be more reliable communications. Note that ATIS functions between the advantageous to use the same format Ease compliance with station identifi- microphone and the transceiver's and-. for ATIS to allow integration of the two. cation requirements. io-frequency amplifier. This facilitates Whatever form of signalling and en- Aid recovery of stolen transceivers. the addition of ATIS to equipment cur- coding is ultimately chosen, it probably Simplify licensing procedures. rently in use. An ATIS module could will not be easily deciphered by the aver- Reduce necessary air time. easily be inserted between the micro- age' CB'er. This will necessitate verbal In addition, as pointed out by Stuart phone and the microphone jack of a transmission of callsigns in situations Lipoff of Anhui. ,D. Little, Inc., ATIS and transceiver. In fact, if the use of ATIS where the communicators require this selective calling systems can easily be were approved by the FCC, we could information, such as when reporting an emergency on chanñel 9. Fig. 1. Block diagram of a basic indentification system. Another decision which most be made MICROPHONE is what information to use as the identifi- A -F er. If programming of the ATIS AMPLIFIER memory is to be done by manufacturers of CB transceivers and ATIS.modules, it would be expedient to use, say, the serial num- CONTROL PARALLEL A TONE ROM -F TIMER LOGIC TO SERIAL CONVERTER GENERATOR ber of the transceiver or module as the identifier. Programming of the licensee's callsign in the field, as was originally 1115015© ELECTRONICS suggested by the FCC, would then be (M\* circumvented. However, if the transceiv- I er's or module's serial number, or any Mini 7208 COUNTER- ~-GáV/ !",_- -ii...1 other number other than the licensee's ' Counter íi7.-ilia3 callsign, were used as an identifier, then 60 MHz the problem of station identification by 600 MHz . "i.r FtKI.ONICt use of the FCC -assigned callsigns re- (with optional prescaler) mains unresolved. It is possible that the General Purpose Low Cost Counter Without the Sacrifice of Basic Performance FCC would alter the regulations to "Check the features we have that some other low cost counters don't have." allow identification by the number pro- AII Metal Cabinet Crystal Time Base Completely Auto Decimal Point 4" LED Display or 12V grammed into ATIS. Transmissions 8 Digit 115V Operation Selectible Gate Times (1 sec & .1 sec) .-.q' Mil Input Cable Included Push j Button Controls State of the Art LSI Circuitry ORDER NOW I made using a transceiver equipped with 12V Input Jack Gate Light Sensitivity <10 MV Call Toll Free 1-800-828-7422 ATIS, no matter what information is 7208 60 MHz Kit $119.95 Assembled .... 169.95 used as identifier, would 7208A 600 MHz Kit $149.95 Assembled .... 199.95 galI all carry a unique "brand" which could be correlat- I! .1LJ11i7 1© DAVIS ELECTRONICS 636 Sheridan Dr., Tonawanda, NY 14150 716/874-5848 ed with manufacturers' records to pro- Clfar NO. 9 ON FREE INFORMATION CARD 80 POPULAR ELECTRONICS
AmericanRadioHistory.Com duce positive identification of the source FCC's most recent proposal. Though occur on the present band. Certainly, if a of the transmissions. this would make concurrence with sta- new personal use radio service ón a tion identification requirements easier band other than 11 meters were opened Implementation. If ATIS were uni- for those who are willing to apply AT1S, to the public, ATIS will play an important versally implemented on a mandatory we can hardly expect CB's bad guys part in helping the FCC police the band it basis, would be necessary to retrofit (those who use excessive r -f power, effectively. But initiating such a system the approximately 25 -million CB trans- work DX, broadcast obscenities, etc.) to would have to be mandatory at the on- ceivers now in use as well as all units subscribe to ATIS. set, lest a situation similar to the present "on the shelf." This is a seemingly im- If ATIS is eventually implemented by one develops. Besides, a new band is possible task. Certainly, if mandatory re- the FCC it will probably be on a volun- not in the cards in the hear future. trofitting of CB equipment with ATIS be - tary basis for equipment now in use. It is For the present, it seems that the FCC Came law, it would just be another unen- possible, of course, that manufacturers will have to continue to rely on conven- forceable regulation. of CB transceivers will be compelled to tional, catch -as -catch -can enforcement Voluntary implementation of ATIS is incorporate ATIS into their products in techniques, as well as on self -policing another possibility, as indicated in the the future. Bút it's doubtful that this will among CB'ers. O STATEMENT OF OWNERSHIP. MANAGE- MENT AND CIRCULATION (Required by 39 3685). I. of Popular Elec- r------, U.S.C. Title Publication: tronics. A. Publication No. 438240 2. Date of filing: in October 1. 1977.3. Frequency of issue: Monthly. A. Bear catR_ Scanner No. of issues published annually: 12. B. Annual sub- scription price: $12.00. 4. Location of known office El $289. of publication: One Park Avenue, New York, New The Bearcat 210 super synthesized receiver 10016. 5. the or York Location of Headquarters scans and searches over 16,000 different E General Business Offices of the publishers: One frequencies without expensive crystals. Park Avenue, New York, New York 10016. _ 6.Names and complete addresses of publisher, edi- The Bearcat 210 covers 32-50, 146-174 & tor. and managing editor: Publisher, Joseph E. Mes- 1 416-512 Mhz., and has AC/ DC operation. ics, One Park Avenue. New York. New York 10016; Save over $60.00 now by ordering on our 24 Editor. Arthur P. Salsberg, One Park Avenue, New hour toll -free credit card order line York. New York 10016; Managing Editor. John R. 74 800-521-4414. In Michigan and outside the 1 Riggs. One Park Avenue. New York. New York U.S. call 313-994-4441. Add $5.00 for 10016. 7. Owner: Ziff -Davis Publishing Company, 47 v - shipping in the U.S. or $9.00 for air UPS to 1 One Park Avenue. New York, New York 10016; Ziff J the west Corporation, One Park Avenue. New York, New coast. Charge cards or money , 1 York 10016. 8. Known bondholders. mortgagees. r orders only. Foreign orders invited. TM and other security holders owning or holding I per- cent or more of total amount of bonds, mortgages or COMMUNICATIONS ELECTRONICS 1 other securities: None. I I P.O. 1002 DEPT. PE1 VISA' BOX I v' I 10. Average Actual no. ANN ARBOR, MICHIGAN 48106 no. copies copies of Zal 1=1 each issue issue INN WI J single CIRCLE Extent and during published NO 7 ON FREE INFORMATION CARD nature of preceding nearest to circulation 12 months filing date A. Total No. Copies "My father built this Printed (Net Press Run) 480,817 490,875 B. Paid Circulation 1. Sales through Dealers and Carriers, Schober Organ for me! Street Vendors and Counter Sales 82,467 86,000 You'd be proud to buy her an organ this "ready-made" organs...easily comparable to 2. Mail Subscriptions 322,809 323,235 good... but how would you feel if you'd also others at twice the price. Kit costs range from C. Total Paid Circulation built it? It's a special kind of satisfaction. The $650 to $2850 for all basic components, and (Sum of 10(31 and 1082) 405,276 409,235 gift of a lifetime of magnificent music, crafted you can purchase it in sections to spread D. Free Distribution with your own hands! costs out...or have two-year time payments. by Mail, Carrier And you or Other Means can do it! You need no prior When you've completed the basic organ, Samples, Com- electronic or mechanical abilities. Just the Schober offers a full complement of acces- plimentary, and capacity to follow instructions. Every step is sories...plus cúmplete organ playing courses! Other Free Copies 8,451 7,863 clearly detailed, every component is supplied. People have been building Schober Electronic E. Total Distribution You'll find the assembly process as enjoyable (Sum of C and D) 413,727 417,098 Organs for their daughters, sons, wives, hus- as the music which follows! bands...forthemselves...for 20 years now. Join F. Copies not distributed And what music! For 1. Office Use, Left Over, this is a truly fine the thousands of delighted Schober people. Unaccounted, Spoiled instrument you will build. Far superior to most You can have all the details, without cost After Printing 2,135 1,577 or obligation. Just send the coupon for 2. Returns from the News Agents 64,955 72,200 fascinating Schober color catalog (or enclose $1 for a record that lets you hear ás well as G. Total (Sum of E, F1 and 2-should equal see the quality of Schober). Why not clip it net press run L' right now, before you forget? shown in A) 480,817 490,875
I I. I certify that the statements made by me above are correct and complete. WILLIAM L. PHILLIPS. Assistant Treasurer i 12. For Completion by Publishers Mailing at the Regular Rates: (Section 132.121. Postal Service Manual) eliálhor 39 provides U. S. C. 3626 in pertinent part: "No he egM4/00 Organ Corp., Dept. PE -75 person who would have been entitled to mail 3 West 61st New York, N.Y. matter under former section 4359 of this title Street, 10023 shall mail such matter at the rates provided un- Please send me Schober Organ Catalog. der this subsection unless he files annually with II Enclosed please find $1.00 for 12 -inch L.P. the Postal Service a written request for permis- -j record of Schober Organ music. sion to mail matter at such rates." In accordance with the provisions of this statute, NAME I hereby request permission to mail the publica- tion named in item I at the phased postage rates II ADDRESS presently authorized by 39 U. S. C. 3626. WILLIAM L. PHILLIPS. Assistant Treasurer 11 CITY STATE ZIP JANUARY 1978 L CIRCLE NO. 43 ON FREE INFORMATION CARD
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7427 276-1823 '49C _ 7432 276-1824 490 7441 276-1804 990 7447 276-1805 990 PC Board Accessories Build an LED Cs 7448 276-1816 990 ;Lpe. 7451 276-1825 390 7473 276-1803 490 Digital Clock 7474 276-1818 790 7475 276-1806 791 7476 276-1813 590 7485 276-1826 1.19 0 7486 276-1827 490 7490 276-1808 790 7492 276-1819 690 , /'f 74123 276-1817 990 1 LI . ll %i.: rg 74145 276-1828 1.19 74150 276-1829 1.39 e,a.Y,:ó'..... "- 74154 276-1834 1.29 . 74192 276-1831 1.19 74193 276-1820 1.19 8 -piece photographic PC board prócessing kit - fastest, 74194 276-1832 1.19 easiest way to produce perfect printed circuit projects. 12 -HR LED Clock Module. Just add a transformer and switches for a 74196 276-1833 1,29 276-1560 12.95 complete clock with 0.5" LED display. 277.1001 14.95 Etch -Resist Marking Pen. 276-1530 1.19 Transformer for above. 120VAC 60 Hi. 273.1520 3 99 Etchant Solution. 276-1535 1.89 SPOT Miniature Pushbutton Switch. 275-1547 5/1.99 PC Board Assortment. 276-1573 1.98 Display Case. 1'3/,4x37/ex47he". 270.285 3 95 I 5 CMOS ICs 100% guaranteed LED Digital Displays Power Supply Parts electronically end mechanically 1=1 11 1 . n Type Cat. No. ONLY -i it/Tt1 i tY YYYYI Y Y 11 YJI 74C00 276-2301 490 I 74CO2 276-2302 490 74C04 276-2303 490 74C08 276-2305 49C Digits Size Drive Cat. No. ONLY Digits Size Drive Cat. No. ONLY 74C74 276-2310 890 E1 0.6' Anod, 276-056 2.99 El 1 0.3" Anod. 276-1210 4/6.99 74C76 276-2312 890 1 O1 0.6" Cath. 276-066 2.99 Oa 1 0.3" Cath. 276-1211 4/6.99 74C90 276-2315 1.49 D]1 0.3' Arrvd 276-053 1.99 BE 4 0.5' Anod. 276-1201 6.95 6 -Amp Full -Wave Bridge Rectifier. 50 PIV. 74C192 276-2321 1.69 m 1 0.3" Cath. 276-062 1.99 07 4 0.5' Cath. 276-1202 6.95 276-1180 1.99 74C193 276-2322 1.69 50V 3 -Amp Power Rectifier. 300-A surge. 4001 276-2401 498 276-1141 Pkg. 2/690 4011 276-2411 490 Electrolytic Capacitors 4013 276-2413 890 3300 µF at 35V. 27.2.1021 2 99 tL 4017 276-2417 1.49 o IC Accessories 5000 1aF at 35V. 272-1022 3 49 4020 276-2420 1.49 Heavy -Duty Transformers. All for 120VAC, 60 Hz. 4027 276-2427 89C 4049 276-2449 690 a © Cat. No. Vohs Current Size Each 4050 276-2450 690 273-1512 25.2 CT 2A 295x2/87 4.99 4511 276-2447 1.69 273-1513 12 SA 402s244" 8.95 4518 276-2490 1.49 273-1514 18 CT 4A 4x2x2Yr" 8.95 1)1 M Low -Profile DIP Sockets Silicon Solar Cells Pins Cat. No. Price
8 . 276-1995 2/590 Linear ICs O Bus Strip. 276-173 1 99 m Expenmenter.Socket. 276-172 9 95 14 276-1999 2/890 By National Semiconductor El DIP Switch. 275.1301 1.99 16 276-1998 2/890 28 al DIP Header. 276-1980 1 29 276-1997 Ea. 890 and Motorola first quality 40 - al Right Angle 16 -Pin Socket. 276-1985 1.49 276-1996 Ea. 99C Type Cat. No. ONLY \11111\\TIE 301CN 276-017 49C 324N 276-1711 1.49 Computer Chips Produce Power from Light! 339N 276-1712 1,49 2cmx4cm. 0.5V at 100mA. 276-120 2 386CN 276-1731 990 99 555CN 276-1723 798 2cmx2cm. 0.5V at 60mA. 276-128 1 99 556CN 276-1728 1.39 I 566CN 276-1724 1.69 567CN 276-1721 1.99 723CN 276-1740 690 Clock ` 741CN 276-007 490 i7777qY- - 741H 276-010 490 ¡ The CPU and Memory IC's 3900N 276-1713 990 Chips + i you P need for building your 1/4 ; 3909N 276-1705 990 Y rj t ;f N own personal computer. 3911N 276-1706 1.99 UII 4558CN 276-038 790 - 75491 276-1701 99C 75492 276-1702 990 8080A Microprocessor. An 8 -bit Na- 2102 Static RAM. 1024 -word by 50252. 12 -hour clock, 24 -hour alarm chip. With 7805 276.1770 1.29 tional Semiconductor chip in a one bit read/write memory. Under full specifications. 276-1751 6 99 7812 276-1771 1.29 40 -pin DIP. 100/ Prime. 600 nS access time. 7001. 12 -hour calendar alarm clock IC. With all 7815 276-1772 1.29 276-2510 17.95 276-2501 2.49 Ea. or 8/14.95 data. 276-1756 10.95
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I.C.'S RESISTORS TRANSISTORS CAPACITOR5 DIODES I.C. SOCKETS & PINS SWITCHES DON'T FORGET OIJR 7 MODULES . OPTOELECTRONICS BREAD GOADING & TESTING DEVICES DRAFTING SUPPLIES DI WHEN COMPARING PRICE WRITE FOR FREE CATALOG ,CCLOCK'COUNTS DATA BOOKS HEAT SINKS WIRE TOOLS... AND MCRE... LED DIGITS AND LAMPS ZGUO:. 8080A CHIP SET ' TTL DATA BOOK, 592 P. NAT. SEMI 91016 54.00 INTEGRATED CIRCUITS LINEAR DATA BK, 952 P, NAT. SEMI. 90118 $4.00 !! map 315- Sq6 Dbh, CC Rtl s Las PLUS ONE EACH 8080A, 8212, 8224 and 8228 1x0501 .5" Sqa '4 (C. ºtl 4.34 CMOS DATA BK.SIS S, IT.15 555 T. SEMI...9012B $3.00 74198 1.49 7415261 2.00 LF357N 1.20 IMOW 09. CC, Red. 4.34 BK. 5, P NAT. S EMI 90138 $3.00 TT1 SIXTEEN 2102-1's ALL FOR i .1 5R TRANSISTORS. 74199 1.49 7415266 .39 1513741 .76 - (X0809 CC. 2.40 I. - 1- O9. R5.. MEMORY DATA 8K. 592 P. I 90148 $3.00 .86 7415173 1.28 LM301AN .44 860477 4^ 094. Red . isa WO CA- I DATA BK 713 P. NAT. SEMI 90158 14.00 y -400 .21 3' Dal 0q.,. CA, Red.. 2.20 74251 1.09 7415279 .62 LM307N .64 691371 INTERFACE DATA BK, 464 P. NAT, 90168 $4.00 'I 1401 .11 1.00 $49.95 484574 3" Owl 09.4 CC. Pod.. 2.20 74279 .55 7415283 .79 1M308N VOLTAGE REG. BK, P. NAT. SEMI 90178 " 7402 .21 N5N544 5" Dull 09,5 CC. Pod. 2.40 128 53.00 74298 04 7415290 .65 LM309K 1.80 , 7403 .21 91X144 1" 0,.1094+. CA. Rod. 2.00 LIN. APPLIC. BK. VOL. 1.432 P. NA T. SEMI 901 ER 54.00 74365 .67 7413293 .65 LM311N .90 MICROPROCESSORS 7404 .21 x10444.7' 0,.40N4,. CC. Re. 2.00 BK. 2, 746 T. T. SEMI 90198 54.00 74366 67 7415295 1.12 1M317T 3.00 7405 .21 Best Yell xOPN 7' 0009x+. n, Rod 2.0o AUDIO HANDBOOK, 196 P, NAT. SF MI 90208 54.00 74367 67 7415798 1.30 LM317MP 1.90 Values Rea 7406 .25 404,57 04. T4, 1.,.0 80800 MICRO. STS. DESIGN MAN. N AT. SEMI 9021 B 15.00 74368 67 7415365 .67 LM318N 2.70 Nd.-a2.40770 14100 7407 .25 8060A 8.811 CPU, 2 USEC CYCLE 512.95 .0,q SC MP MICRO. APP. MANDBK, NAT. SEMI 90128 55.00 7415366 .67 LM320MP-5 1.30 x0505,on.4,,a. anoW0/1 RedT-10100Red 7408 .21 8212 8.811 I/O PORT S 3.95 SPECIAL FUNCTION DATA BK. NAT. Si Ml 90338 53.00 74L5367 .67 LM320MP6 1.30 ./Mq. xe.n.ono .lemnoo CH,OS 7409 .21 90308 7405368 .67 LM320MP-8 1.30 8216 BI-DIRECTIONAL BUS DR19ER S 4.25 LG'S, 278 P. SOLID STATE SCI ENT $3.00 7410 .11 741500 SIGNETICS ANALOG MANUAL , 637 P 90318 55 95 74L5377 1.50 LM320MP-9 1.30 8224 CLOCK GENERATOR 5 3.95 15% CAIIBON FILM RESISTORS 7411 .21 741501 .28 7415386 .39 1M320MP-121.30 8778 SYSTEM CONTROLLER 5 6.05 7412 11 741502 .28 7415395 1.71 LM320MP-151.30 'A WATT RESISTOR ASSORTMENTS MICROPROCESSOR BOOKS COMMUNICATIONS INTERFACE 512.95 7413 .25 741503 .28 7415670 2.34 LM320MP-181.30 8251 OSBORNE 7414 .89 741504 .29 811595 .77 LM320MP-181.30 8255 PERIPHERAL INTERFACE 511.95 ADAM 7416 .25 741505 .29 811596 .77 LM320MP.241.30 1702A 1K EPROM 1256081 5 6.95 RS121 LNON DIS000NTABLEI 7417 .25 741508 .29 811597 .77 LM323K 7.50 2708 88 EPROM (1148) 579.50 AN INTRODUCTION TO MICROCOMPUTERS, VOL I 7420 .21 741509 .29 ROTS .., áá1w44.n..ú ie4' 69.90 8115913 .77 1M324N .72 iLs .~..q BASIC CONCEPTS 90008 -ND S 7.50 7111 .25 741510 .28 2102-1 1K RAM 500 NS S 1.79 LM325N 2.70 '7, WATT RESISTOR ASSORTMENTS AN INTRODUCTION TO MICROCOMPUTERS, VOL. II 7423 .35 741511 .28 INTERFACE SC/MP 5 9011 SC MP CPU S 9.95 1M326N 7.70 SOME REAL PRODUCTS . 9001B.ND 515.00 i 7425 35 741517 .28 2650 MICROPROCESSOR 1.25 MH-2 CLOCK 40 DI 524.95 .40 LM327N 7.70 8080 PROGRAMMING FOR LOGIC DESIGN 90028 -ND 5 7.50 7426 .25 47 8093 .40 LM339N 1.15 ,..+`i PROGRAMMING FOR LOGIC DESIGN 9003B.ND 5 7.50 8094 RSISOr,tiie , . Su.10 6800 7427 .33 741514 1.02 LM3403.5 1.25 i:.*.r 7428 .28 8095 .67 WIRE WRAPPING WIRE IN BULK. 741515 .28 LM340Tó 1.25 R5250,..,,a4i242i:,+-..e0 w`u",.:4FI4H.90 7430 8096 .67 SAMS BOOKS :3` 741.570 .28 LM340T8 1.25 Red or Black 30 ga. bear 7432 25 741521 28 8097 .67 (NON.DIS000NTABLF) 8098 .67 LM3403-10 1.25 100' 12.00 S00' 58.50 1000' 515.00 7433 30 741577 .28 sv e 5 9.45 .8B LM340T-12 1.25 'p) Bishop Graphics CMOS COOKBOOK 71398.80 7437 .25 741526 .33 75450 1M240T-15 1.25 THE BIG CMOS WALLCNART 21399.80 S 7.80 7438 15 741527 .33 75451 .61 .¿aRErEI++, .' 1111F1111T11 FIT CIRCUITS 21439.110 S 4.70 75452 61 LM3403.18 1.25 CARBON FILM RESISTORS h. , ' 7439 50 741528 .33 5% 61 LM340T.24 1.25 IC TIMER COOKBOOK 2141560 5 9.12 7440 .21 741530 .28 75453 LM341 P-5 .98 PRINCIPLES & APPLIC. OF INVERT. B CONY 21454.ND 5 7.55 75454 .61 .48 'I, WATT SIZE it.:'"'"'"":7°"'"'"'"` RN 7442 .53 741532 .33 »4s-xe 12.50 .-- 75491 .81 186341Pó .98 ABC'S OF CAPACITORS (2ND EDIT.) 20849.ND 5 4.04 7445 .70 741533 .33 5921506* 5' ea.. ISOprit.OW 1.7' n.. 1M341PA .98 ABC'S OF INTEGRATED CIRCUITS 70823.ND S 3.33 7440 .70 741537 33 75492 .84 1.09 1M341 P-10 .08 l0l9---/eabe 1.2' «. ABC'S OF RESISTANCE & RESISTORS 21126 -ND 5 3.75 7447 .70 741538 .33 75493 75494 1.19 LM341 Pd 2 .98 CLOCK MODULES ABC'S OF VOLTAGE -DEPENDENT RESISTORS 20771 -ND 5 3.09 7448 .70 741540 .28 MC1 a 88N .90 1M311P.15 .98 PLESSEY SAMPLER -ND 7450 11 741542 .67 Or MÁ1002 and .1010 6.11 4eá 4.04.61 N 00104.15.64004.70. 0n ACTIVE -FILTER COOKBOOK 21168 514.20 MC1489N .90 1M341 P-18 .98 (bets .,6R e 1 4914 UR 40,06 444 a, 1405 COLLECTED BASIC CIRCUITS 20784 -ND S 5.23 7451 .21 741547 .79 AN ASSORTMENT OF METALIIED POLYESTER CAPACITORS tun, 0++04x4 0,d ,.a.e 1M341 P-24 .98 s.4641 end 7453 .21 74Lt/8 .77 *6.9304 4161. en rho me* 60474. 564Y =0006 0., 44.0.1 HOW TO DESIGNS. USE MULTIVIBRATORS 21043 -NO 5 3.75 1M348N 1.60 526.00 Ám6000, and you %ore a fury 7454 .21 741551 28 300 CAPS 18 VALUES 6000,441óo HOW TO USE IC LOGIC ELEMENTS 21081 -ND 5 4.70 LM349N 1.60 12 Lea. 1b[k 7460 .21 74554 .28 4000 .23 TI sums 1100 77,0459 h 06146 anNM d r+rtl IC OP.AMP COOKBOOK 20969 -ND 512.30 LM358N .72 hyh X,1165.9.404.0 Á4.n1.,14,4094 9,e 1.1,101 66,, has 4,+',R 7470 30 741555 .28 4001 .23 MINIBOX METALIZED POLYESTER CAPACITORS 14,.90 LED CIRCUITS AND PROJECTS 21006 -NOS 4.99 1M1310N .84 pulse for o, .m, o 4,7740 portable .46. n 4P.m,, 4.071 ha, ,1 4002 S 6.18 7472 .30 741573 .39 .23 4,n. push 6,760, MOS DIGITAL ICS 21299.60 LM18006 .94 :004373..15 1 75/10 10.00/C h, DC >a 0e ,4,+64,4,.4 i, ~wild. o,. w. 64Lá.+ 7473 30 741574 .39 4006 1.23 .001 ..14 1.15/10 9.00/C PRACTICAL SOLID-STATE CIRCUIT DESIGN 21018.70 5 6.18 LMI801N 1.70 ..15 1 75/10 10.00/C .n het for sen99 ,w. rime. 7474 .30 741574 .39 4007 .23 .0022 .14 1.15/10 9.00/C RC 5 4.70 4.B0 CIRCUITS 21332-70 7475 .49 741575 4008 79 LMI812N 9.00/C .068 ..15 1.25/10 10.00/C .53 .0033 .14 1.15/10 IMA10024 y 11012 Ma,. A1Á40701í Module '10.50 REGULATED POWER SUPPLIES 20846.70 S 5.23 4009 .44 LM1830N 1.30 .1....17 1 35/10 11.00/C 7476 32 741376 .39 .0047 .14 1.15/10 9.00/C RTL COOKBOOK 20715 -ND S 5.46 4010 .44 1M1889N 2.00 .72...23 1.85/10 15.00/C MAI002ASET melee with Tranderner 5.dthas 113.95 7480 .70 741578 .39 .0068 .14 1.15/10 9.00/C SPECIFICATIONS MAN. (8TH ED.) 21335 -ND S 1.25 70.00/C TRANSISTOR . 6.60 7483 .70 741,583 79 4011 .23 1.15/10 9.00/C .33 ...30 2.50/10 Mm0b 210.50 1M2901N 1.50 .01 ...14 47...36 24.00/C MA1002C LED 10 Hour Clerk TRANSISTOR SUBSITUTION HOBK (16TH ED.) 21333 -ND S 4.70 7485 .89 741585 .49 4012 .23 .022 ..IS 175/10 10.00/C 300/10 LM2917N 1.50 4 613.9$ ABC'S OF FIT'S 20789 -ND 5 2.80 7486 .28 741586 39 4013 .40 MA1002C SET Module.rtmm4000n sahs. R> ABC'S 01 TRANSISTORS (3RD ED.) 21146.110 5 4.00 .96 LM3089N 1.30 7489 2.19 7a1590 .57 4014 ELECTROLYTIC CAPACITORS U IMP C4 Cloak .hh s.41n+ . ... 8'24 95 LM3900N .88 MA1003 ... ABC'S OF ZENER DIODES 21045.ND S 3.75 7490 .44 741592 .57 4015 .96 LM3900N .88 12 Ma, 01440 Cbn 1464,16 513.00 FET PRINCIPLES. EXPER., 8 PROJECTS (2ND) 21167 -ND 5 8.08 7491 .70 741593 .57 4016 .40 VALUE RADIAL LEADS AXIAL LEADS MA1010A N' In 4017 LM3905N 1.40 LINEAR IC PRINC., E%PER. & PROJECTS ... 21019-60 S 8.50 7492 .44 741595 88 1.05 57/509 08 .65/10 5.41/C .11 90/10 7.65/C MAlOTOA SET Me1k 00001,m,e. L 6.4(x.. 216.45 LM3909N .69 MICROMINIATURE ELECfRÓNICS 20582 -ND 5 5.46 .1 7493 .44 741596 .88 4018 1.05 1/509 08 .65/10 5.41/C .11 90/10 7.65/C LM3911N 1.50 86Á1010C AI IFD 14 Mal Cbn Mnd.N .. 6666 13,00 SEMICONDUCTOR REPLACEMENT GUIDE N $ 3.75 7494 .70 7415107 .39 4019 .23 90/10 7.82/C MC1456V 1.00 2.2/509 08 .65/10 5.41/C .12 PLANNED 7495 .70 7415109 .39 4020 1.14 MA1010C SET Mel* 000106,00.7 1 S..,.., `16.45 TRANSISTOR FUNDAMENTALS -A CAREFULLY MC14589 .53 3.3/509 08 .65/10 5.41/C .12100/10 8.31/C M 7496 .70 7415112 .39 4021 1.14 PROGRAMMED COURSE IN SEMICONDUCTOR THEORY MC149631 .70 4.7/359 08 .65/10 5A1/C .12 .95/10 7.91/C . 74100 1.28 7415113 .39 4022 .96 AND CIRCUITRY: MC3302P 1.15 4.7/509 08 .68/10 5.75/C .12100/10 8.31/C WO 74107 30 7415114 .39 4023 0.5'r Hi9h VOL. 1 -BASIC S8ORICONO. 8 CIRC. PRINC. 20641.ND S 4.99 NE5361 2.50 10/160 08 .65/10 S41/C .11 .90/10 7.65/C 74109 .33 7415125 .49 84 p1002 5 4.99 NE5401. 1075V 08 .65/10 566/C .12100/10 8.31/C 4075 2.04 S ', 741161.26 7415126 .49 .23 10/350 09 .70/10 6.12/C 1.10/10 8.94/C VOL. 3 -ELECTRONIC EOUIP. CIRCUITS.. 20643.60 4.99 4026 168 NE555V .48 .13 74121 35 7415132 .81 1.15/10 9.56/C VOL. 4 -DIGITAL 8 SPECIAL CIRCUITS .. 20644.60 5 4.99 4027 .40 NE556A .88 10/509 10 .75/10 6.58/C .10 74122 .44 7415136 .39 1.00/10 8.31/C 4 VOLUME SET ... 20645 -ND 518.53 4028 89 N15589 2.40 n 169 08 .67/10 5.66/C .12 74123 .61 7415138 .73 .70/10 .13 TRANSISTOR -TRANSISTOR LOGIC 20967.60 5 6.17 4029 1.14 NE559N 2.40 22759 09 6.09/C 105/10 8.74/C 74125 .40 7415139 .73 TUBE SUBSTITUTION HDBK (19TH EDIT.) 21225 -ND S 2.14 NE560B 2.50 22/359 . 11 .85/10 7.29/C .15 1 19/10 9.08/C 74126 .40 74E5151 .75 .13 TWIN-PAK PACKAGE -ND 5 22 509 12 1.00/10 8.48/C .17 1 32/10 11.22/C SPECIAL TUBE SUB. 21227 2.80 7415153 .75 4033403 151 1456111 2.50 74128 .48 33/169 09 .75/10 6.90/C .12100/10 8.48/C 5 3.75 70 7415154 1.10 4034 3.50 7156213 2.50 74132 33/250 10 .81/10 7.50/C .14 115/10 9.56/C SOLID-STATE IGNITION SYSTEMS 21049 -ND S 4.70 74141 88 7415155 .75 4035 1.14 NE565A 1.25 33/350 13 1.05/10 9.65/C .17 134/10 11.23/C SOLID-STATE POWER SUPPLIES 8 CONY 20310 -ND $ 3.33 70 7415156 .75 4040 1.14 NE566V 1.28 t3 71145 TRANSISTOR AUDIO AMPLIFIERS -ND 5 5.62 4041 .79 NE5679 1.36 33/SOv la 1.13/10 10.41/C .19 1.52/10 12.89/C 1.315 20838 74147 1 63 7415157 .75 Site: UA709CV .44 47/lOV 09 .71/10 6.52/C .13 104/10 9.50/C Ac5ua1 TTL COOKBOOK 11035 -ND $ 8.50 1 7415158 .75 4042 79 ! 74148 30 47/160 10 .81/10 747/C .14 1.15/10 9.56/C 0548508/DI TO TTl 21080 60 S 2.38 74150116 7415160 1.07 1043 .70 UA710CA .44 97RSv 13I.05/10 9.65/C .17 1 30/10 11.22/C TV TYPEWRITER COOKBOOK 21313.60 5 9.45 74151 70 7415161 1.02 4044 70 UA711CA .53 High Ft ; 47/7594477 755090 14 1.13/10 10.41/C .19 131/10 12.89/C UNDERSTANDING CMOS L.C.'S 21129.ND 5 4.70 74153 65 7415163 1.07 4046 1.86 UA723CA .60 0.84 c, 15 1.21/10 11.16/C .21 1.71/10 14.55/C AMP/IF 5 74154 1.03 7415164 1.02 4049 .40 UA733CA .75 MA3010 UNDERSTANDING IC OPERATIONAL 20805.80 3.75 100/109 10 .77/10 .14 1 13/10 9.56/C S 4.70 74155 .70 7415160 1.14 4050 .40 UA74ICV .44 658/C UNDERSTANDING OSCILLATORS 20837 -ND 100/169 11 .85/10 .17 1 30/10 11.n/C 74156 70 7415169 1.14 4051 1.26 UA747CA .70 7.78/C 07100E IC OP.AMP APPLICATIONS 21163-7D 5 4.70 UA748CV .49 100/259 13 1.10/10 9.15/C .20 1 55/10 13.30/C > TO 8 USE MINI & MICROCOMPUTERS 21351 -ND S 9.45 74157 30 1415170 1.73 4052 1.26 _,_1- HOW BUY 100/359 17 I41/10 11.85/C .25 1.93/10 16.50/C 74160 .88 74L5173 1.34 4053 1.26 UA7805CU 1.75 I HOW TO PROGRAM MICROCOMPUTERS 21459 -ND 5 8.50 100/500 21 1.71/10 14.55/C .29 2 30/10 19.70/C 74161 88 7415174 1.06 4060 1.58 UA7806CU 1.25 MICROCOMPUTER PRIMER 21404 -ND S 7.55 210/10V 13 1.08/10 9.15/C .18 1,42/10 12.05/C 74162 .88 7415175 .84 4066 .79 UA7808CU 1.25 THE 8080 A B U GBOOK: MICROCOMPUTER I 1.16/10 9 .86 I C .20 1. 5 510 13.0 C 74163 .88 7415181 2.50 4071 .23 UA7812CU 1.25 220/1695 1 / INTERFACINGUDICTIONARYPROGRAMMING 21943 -ND 5 9.45 21 14.55/C .29 2.35/10 19.96/C I UA7811CU 1.25 220R5V 1.71/10 74164 .96 7415190 1.18 4072 .13 COMPUTER DICTIONARY(2ND EDIT.) 20053 -ND 5 8.50 270q5V . 25 17.26/C .35 2.79/10 23.70/C 74165 1.15 7415191 1.18 4073 .23 UA7815(U 1.15 2.03/10 i HANDBOOK (2ND EOT.) -NO :s COMPUTER 6 20850 518.53 4075 UA7818CU 1.25 ¿MAN n 2.35/10 19.96/C .40 3.13/10 17.e1/C s i s 7 .T 74166 1.15 7415192 .98 .23 s -ye3A i :01W.1. 5 COMPUTERS 8 PROGRAMMING GUIDE FOR 7.25 330/60 14 1.12/10 9.50/C .19 1.48/10 17.71/C I 74170 2.64 7415193 1.06 4081 .23 UA7824CU FNGIN 20950 -ND 012.30 330/109 15 1.16/10 4.83/C .21 I 64/10 15.13/C R- EiaS óclueLsoa. ' 74174 .98 7415195 .88 4082 .23 UA78LOSACZ .40 74175 .93 7415195 .86 4502 79 UA78L06ACZ .40 330/169 21 1.66/10 1E.14/C .31 245/10 22.70/C WATT ZENER DIODES HARDWARE 74176 .79 7415196 .86 4510 1.14 UA78LOBACZ 40 330/359 23 186/10 15.79/C .38 3,07/10 28.38/C i 74177 .79 7415197 .86 4511 1.05 UA78L1oACZ .40 330/359 33 266/10 24.59/C .43 343/10 71.68/C 4 .15 1.30(10 1100/C 2-56 1/4 74180 .70 7415197 .86 4514 2.80 UA78L17ACZ .40 330/509 Sd 430/10 39.73/C .60 81/10 44.45/C SCREW... 99/C 2.56 1/7 SCREW 74180 .70 7415221 1.06 4515 2.80 116781.15ACZ .40 470/60 15 1.71/10 11.16/C .20 1.65/10 15.13/C ....99/C 11457268 3.3V 1752428 129 400 1/4 SCREW... .55/C 74181 2.15 7415240 1.90 4516 1.23 UA78LI8ACZ .40 470/109 21 1.71/10 14.55/C .31 245/10 n.70/C 175243B 13V 460 71182 .79 7415241 1.90 4518 1.14 UA78124ACZ .40 470/169 23 1.81/10 15.39/C .33 266/10 24.59/C 1N5777B 3.6V 1/2 SCREW... .60/C 114522811 3.9V 1N5244B 149 6-321/4 SCREW . 74184 2.15 7415247 1.70 4520 1.14 U47906CU 1.70 470/250 29 2.35/10 19.96/C .43 3.43/10 31.68/C ... .65/C 1752458 150 74185 2.19 7115243 1.70 4527 1.68 UA7906CU 1.70 470/350 41 3.27/10 3016/C .47 3.78/10 34.90/C 1752198 4.39 6.32 1/2 SCREW ... .75/C 1752308 4.79 1N5246B 16V . 74189 3.50 7415244 1.70 4528 .88 UA7908CU 1.70 470/509 54 430/10 39.73/C .75 6.03/10 55.80/C 802 3/8 SCREW ... .90/C 74190 1.23 7415247 .79 4585 1.23 U47909CU 1.70 1000/69 n 1.90/10 16.50/C.35 276/10 25.54/C 1NS231B 5.1V 111514713 I7V B-31 5/8 SCREW ... 99/C 1N5248B 189 NUTNOV 74191 1.23 7415248 .79 7aC00 .23 U47912CU 1.70 1000/10V 24 1.96/10 16.62/C 8 3017/100 28.38/C 175232B 5.69 T56 HEX 55/C IN5233B 6.0V 1752498 199 4.40 HE% . 74197 .88 7415249 .79 DA7915CU 1.70 1000/160 22 2.35/10 10,96/C 43 Z43/10 31.68/C NUT 55/C 1N5234B 6.29 1752508 209 '. 74103 .88 7415251 84 L1.u6UA7918CU 1.70 1000/25V 42 3.33/10 38.27/C .68 5.42/10 50.13/C 6-32 HEX NUT 60/C . 74194 .88 7415253 .84 CA304 11.17974C111.70 1000/35V 60 4.81/10 44.45/C .75 603/10 55.81/C 17513511 6.8V 1752518 nV 8-32 HEX NUT 60/C 74195 88 7415257 .75 A3086 .50 2200,6V 36 2.86/10 26.48/C .43 3.43/10 3138/C 1N5236B 750 175252E1 24V NO 2 LOCKWASHER 85/C .76 1752538 25V NO 4 LOCKWASHER 74196 88 7aL5258 .75 1F351N 2200/100 42 3.33/10 18.27/C .60 0.81/10 44.a5K ` 4 e+ MA1003 '24.9 1N5237B 8.2V 45/C 74197 .88 7415260 34 183561. 1.20 MM53147 3.75 22(10/169 54 4.30/10 36.58/C .68 5.42/10 50.13/C yeW',n..o4^ 4 114523813 8.7V 11,152548 27V NO 6 IOCKWASHER 45/C L` 391 9.19 1N52558 28V NO 8 LOCK W ASHER 45/C I.C. SOCKETS 175256B 30V I-1 DOUBLE DIGIT DISCOUNTS SAVE YOU EVEN MORE! 1752411 119 1752578 330 .FREE CATALOG I .[]4,N SOLDER...17 1.60/10 14.50/C SILICON DIODES '.6 PIN SOLDER ..20 190/10 17.00/C VOLUME DISCOUNT a SILICON TRANSISTORS PIN SOLDER ..22 18.75/C 1 .026 2.10/10 174001 .64/10 5.50 C HANDLING CHARGE ' 16 1.55110 13.601( 130.00/M 08 PIN SOLDER ..29 2.75/10 24.50/C 174002 .66/10 5.60,C HANDLING 71P5918 70 PIN SOLDER ..30 7.85/10 25.25/C MI15222930 16 1.55/10 13.60/C 130.00/M 194003 .68/10 5.80,C catalog VOLUME\ All Hams except those with 1.55/10 13.60/C 130.00/M 12 PIN SOLDER ..33 3.15/10 27.75/C 174004 .70/10 5.95/C MP52222A 16 CHARGES umbers ending wish the suffix -ND may DISCOUNT 1.55/10 13.60/C 130.00/M 7 PIN SOLDER ..38 3.60/10 32.25/C 1X4005.82/10 7.05/C 16 combined discount. $ 86P52907Á 16 1.55/10 13.60IC 130.00/M - 288 PIN SOLDER ..45 4.25/10 38.25/C IN0036 .90/10 7.75/C $ 0.00.$ 4.99.... Add $2.00 k br fbsr-191x1MP52907A0.00-5 24.99 NET ems Odd apply 16 13.60/C 130.00/M 40 PIN SOLDER ..63 6.00/10 53.50/C 1111007 .99/10 8.60/C discountable MP53393 1.55,10 $ 5.00.$24.99... Add $0.75 ° $ 25.00.5 99.99. less 10% 155/10 13.60/C 130.00/M 8 DUI W.W ....24 2.30/10 70.50/C 184148 .40/10 3.50/C volume discount. Then add so this wt.sub MP53393 16 14 PIN W -W... .16 2.50/10 21.00/C $ 25.00.549.99... Add $0.50 tool the nondisxaamoble items. Add $ 100.00-$499.99 . Less 15% MP53394 16 1.55/10 13.60/C 130.00/M 16 PIN W -W....30 2.85/10 25.50/C 16 1.55/10 13.60/C 130.00/M hondling charge. This is your tot91 $ 11335653 .18 PIN W -W....60 5.70/10 51.00/C DIg/.Ky $ 50.00.$99.99:.. Add $0.25 le 500.00.$999.99 . Less 20% 16 1.55/10 13.60,C 130.00/M cat. e p0r oB shipgmg ane ins°ronCe 20 PIN W -W....70 6.65/10 59.50/C Stocks No & 25% MP53565 16 1.55/10 13.60/C 130.00/M $100.00 & Up'...... P Charge9 t. peeresses In the U.S.A. and co 4646 $1000.00 Up ...less 13.60/C 130.00/86 '72 PIN W -W....84 8.00/10 71.50/C the Entire ` /1053638AMP53640 16 1.55/10 PIN W -W.. .96 9.10/10 81.50/C 16 1.55/10 13.60/C 130.00/50 ' 24 AP ' 28 PIN W -W ..1.12 10.00110 95.20/C -- Lln M 16 1.55/10 13.60/C 130.00/M W.W 1 Orders Accepted by Phone or Mall 40 PIN 2r1Y4kLBpOI.1 ., MP53643P53641 16 1.55/10 13.60/C 130.00/M lif Money Order roamer 941KRR BRxx MasterC harae Bank -A merlcerd COD Check 2 16 1.55/10 13.60/C 130.00/M 130.00/M {MOLEX E.C. SOCKET PINS .,11==a P.O. Boo 677. Thief River Falls, Minn. 56701 (2181681-6o74 273906N3904 16 1.55/10 13.60/C 274124 16 1.55/10 13.60/C 130.00/M .85/C 8.20/M 38.20/5M 275.00/50M 254176 16 1.55/10 13.60/C 130.00/M 2N4401 16 1.55/10 13.60/C 130.00/M FFDE SWITCHES 50 VOLT DI$3S,, 2N4403 16 1.55/10 13.60/C 130.00/M 100 PF 274410 16 1.55/10 13.60/C 130.00/M SPOT .15 1.25/10 10.00/C 40/10 3.50/ 275087 16 1.55/10 13.60/C 130.00/71 SPOT .19 1.70110 13.00/C 220 PF 40/10 3.50/C 470 PF 40/10 3.50/C DIGI-KEY 2N5089 16 1.55/10 13.60/C 130.00/M DPDT.23 2.00/10 19.00/C 16 13.60/C 130.00/M OF ... 40/10 3650/(0027 775210 135/10 irlIMMDED HOOK UP WIRE ..0022 UF... 40/10 3.50/C CORPORATION 2N3055 99 9,20/10 85.00/C 800.00/61 .0047 ÚF 40/10 3.50,C MPF102 36 3.35/10 30.60/C 300.00/M 1 2290 PVC.. 2.50/100. 10.00/500' .01 OF 45/10 3.65/C 265457 48 4.50/10 41.00/C 400.00/M 27 ga PVC.. 11.25/500' .077 MPSAI3 28 2.60/10 24.00/C 230.00/50 I. 2.80/100' OF . 50/10 4.00C Quality Electronic Components 4 go . 70/10 M12955 99 9.20/10 85.00/C 800.00/M 24 PVC.. 2.10/100' 8.50/500' .047 OF 5.60,,0 River Falls, MN S6701 1218) 681-6674 OF 1 P.O. Box 677 Thief TIP120 99 9.20/10 85.00/C 800.00/M I 26 ag PVC. 7.10/100' 8.50/500' .1 ... 35/10 11.50/C
CIRCLE NO. 10 ON FREE INFORMATION CARD JANUARY 1978 83
AmericanRadioHistory.Com COMPUTER INTERFACE CIRCUITS 1-9 10 UP 1-9 10 UP 1-9 10 UP 1-9 10 UP MH0026CN Y 2.60 5 2.20 SN75246 Y 1.50 S 1.35 DM8820N Y 2.20 5 1.75 AM8228PC $ 8.20 5 7.10 NON -LINEA 060056CN 5.85 4.70 SN7525N 1.40 1.25 DM8820AN 2.95 2.35 AM8238PC 8.20 7.10 0S360381 4.10 3.30 S67510786 2.58 2.06 DM88306 2.95 2.35 9600PC 1.65 1.50 AM1488PC 2.10 1.65 567510885 2.58 2.06 DM8831 N 3.25 2.80 9601PC 1.65 1.30 SYSTEMS, IRNC. AM1489PC 2.10 1.65 SN75109N 2.58 2.06 DM88326 3.25 2.80 9602PC 1.90 1.65 i AM1489APC 2.10 1.65 SN75110N 2.58 2.06 DS8838N 2.95 2.35 9614PC 2.15 1.80 P3212 4.35 3.75 56752346 1.55 1,40 N8T268 3.10 2.70 9615PC 2.15 1.80 PORTABLE 15 MHz P3216 3.90 3.15 SN75235N 1.10 1.00 P8212 4.35 3.75 9616PC 3.15 2.60 DS3604N 6.65 5.35 SN752386 1.95, 1.60 P8216 3.90 3.15 9617PC 2.15 1.80 9N75216 1.40 1.25 SN75239N 1.50 '1.25 AM8224PC 6.50 5.40 9620PC 3.00 2.50 OSCILLOSCOPE P3226 3.90 3.15 SN75325N 2.60 2.35 P8226 3.90 3.15 9621 PC 3.00 2.50 2900 SERIES 81 -POLAR MICROPROCESSOR AND SUPPORT CIRCUITS AM2901 APC 522.00 517.40 AM2913PC $ 4.10 s 3.15 AM29700PC 5 5.65 5 4.50 AM29721PC $ 5.00 5 4.20 AM2901 DC 29.40 22.05 AM2914DC 60.00 45.00 AM29701PC 5.65 4.50 AM297500C 4.50 3.60 AM2902PC 3.82 3.18 AM2915APC 8.10 7.00 AM29702PC 5.65 4.50 AM29751DC 4.50 3.60 AM2905PC 8.10 7.00 AM2916APC 11.20 8.95 AM29703PC 5.65 4.50 AM29760DC 6.80 5.50 AM2906PC 11.20 8.95 AN12917APC 7.15 6.20 AM29704PC 15.75 12.60 AM29761DC 6.80 5.50 AM2907PC 7.15 6.20 AM2918PC 5.40 4.32 AM29705PC 15.75 12.60 AM29803DC 7.65 5.95 AM2909PC 8.95 7.15 AM2922PC 5.78 4.93 AM29720PC 5.00 4.20 AM29811DC 4.85 3.90 AM2911PC 5.95 4,75 BI-POL%1R MEMORY AM27LSOOPC 5 5.00 5 4.20 AM27LS080C S 4.50 5 3.60 P3101 5 4.40 5 3.50 MM6561N S 4.40 3.50 AM27L501PC 5.00 4.20 AM27LS090C 4.50 3.60 P3101A 4.75 3.70 DM8599N 3.30 2.60 AM27LSO2PC 5.65 4.50 AM27LS10DC 6.80 5.50 IM5501CPE 4.40 3.50 82S25PC 4.75 4.20 The MS -15 miniscope is only 2.7" x 6.4" x 7.5", and AM27LSO3PC 5.65 4.50 AM27LS11DC 6.80 5.50 MM65606 4.40 3.50 93403PC 5.25 4.20 weighs only 3 lbs. Vertical bandwidth is 15 MHz. The SILICON GATE MOS LSI graticuled rectangular viewing area is four divisions MK1002L S 7.00 S 6.00 P2111 5 2.50 5 2.00 AM2806HC 5 7.00 Y 5.60 C4702A $18.30 513.85 high by five divisions wide. División spacing is 0.25 P1101A 4,05 3.25 P2111-1 3.70 3.00 AM2807PC 2.92 2.34 MM5025N 40.80 33.60 inches. Internal and external triggering, automatic and 1402APC 4.42 2.75 P2112 2.50 2.00 AM2808PC 5.02 4.02 MM5026D 44.00 35.20 line synchronization modes, and a horizontal input are 1403APC 4.42 2.90 P2112-2 3.70 3.00 AM2809PC 3.52 2.82 MM5027N 40.80 33.60 provided. There are 12 vertical gain settings from 1404APC 4.42 2.75 P2401 24.00 17.55 AM2857PC 7.15 5.75 MM5055N 7.15 5.75 0.01 V to 50 V per division, and twenty one time base 1405A 5.80 4.25 P2405 10.85 7.90 AM2896PC 5.00 4.50 MM5056N 7.15 5.75 settings from 0.1 ¡is to 0.51.1s per division. An optional 1406 10.20 8.40 2505K 3.70 3.56 TMS31146C 9.96 7.32 MM5057N 7.15 5.75 1407 10.20 8.40 251210 4.30 4.05 TMS3133NC 10.85 4.02 M1050586 10.85 8.70 10 to 1 probe and a carrying case are also available. 1506 4.05 3.24 2521V 2.65 2.55 3341 APC 8.25 6.55 P8080A 18.60 15.85 Power is the 115 V, Hz line. provided by batteries or 60 1507 4.05 3.24 2524V 2.50 2.25 1347PC 6.40 5.10 AM9080APC 18.60 15.85 C1702A 18.30 13.85 2525V 3.65 3.55 MM4025D 73.00 58.40 P8101 2.95 2.40 P2101 2.95 2.40 2533V 4.90 4.02 MM4026D ' 73.00 58.40 P8102 2.30 1.80 MS -15 MINISCOPE $289.00 P2101.1 4.20 3.40 26028 4.10 3.85 MM40270 75.00 60.00 P8111 2.50 2.00 41-140 CARRYING CASE 30.00 P2101-2 4.20 3.40 AM2802PC 4.42 2.75 MM405513 16.00 12.80 P8251 12.50 11.50 P21014 4.74 3.85 AM2803PC 4,42 3.54 MM4056H 11.50 9.20 P8255 12.50 11.50 41-141 10 TO 1 PROBE 24.50 P2101A-2 5.50 4.50 AM2804PC 4.42 2.75 MM40570 16.00 12.80 C8702A 18.30 13.85 P2102 2.30 1.80 AM2805HC 3.70 3.56 Mk4102P 21.60 18.00 AM9401PC 16.88 13.50 P2102-1 3.45 2.80 EXAR - INTEGRATED CIRCUITS COMMUNICATION CIRCUITS ALWAYS FIRST QUALITY XR-2208CP Four -Quadrant Operational Multiplier $5.20 PHASE -LOCKED LOOPS XR-210 FSK Modulator/Demodulator $5 20 COMPONENTS XR-215 General Purpose Phase -Locked ANCRONA 2N TRANSISTORS 153646 .14 - 1N40]6 .50 2N4921 60 155306 .] 2N5824 .2s 253604 .23 25403> .fi6 2N4912 1.00 255308 AO 255825 .26 Loop $6.56 INFORMATION 255084 .8Q 3N2904A 36 2NJ]01 .18 364058 .25 254e13 .10 255309 .52 1NSB26 30 XR-2211CP FSK Demodulator/Tone Decoder $6.88 25697 .26 2N19pv .34 253704 .18 254050 2144983 1.10 265321 60 215127 30 ZENER NO. 101 25699 80 2N29054 36 253705 .18 264051 25 254984 1.50 65J72 .)0 15582a 24 FUNCTION GENERATORS 26706 .35 262906 .20 253706 .25 254093 1.10 254987 .75 25532] .)0 2N58284 4U XR-205 Waveform Generator $8.40 25711 49 252906A .21 253707 .18 254123 .20 254988 1.20 255354 34 }Nú000 .50 DIODES 257113 .40 252907 24 253701 20 54124 ,2p 254989 1.60 255355 .38 256001 52. XR-2206CP Monolithic Function Generator $5.12 25718 152907/ .28 253709 .20 15412s 2614991 .75 }66001 54. XR-2207CP Current -Controlled Oscillator $3.84 25918 40 252924 .30 263710 .20 254126 .24 264993 1.80 255366 .50 2N6041 .66 25929 .26 252925 .n 263711 .20 264142 .18 254994 .30 2H5J67 50 2566015 .68 1 wATT V PRICE 25930 .2B .20 2146027 .50 TONE DECODERS 252926 .15 253121 754143 .18 255086 .30 255368 .25 552230 27 22 251132 .35 253019 90 2613724 .50 155017 255369 .26 1N6028 .60 2542200 1.00 30 552240 2.6 .22 XR-567CP Tone Decoder $1.68 261613 .32 253053 .36 253735 .52 54224 1.25 255088 .30 255370 .28 2N6034 .92 552250 3.0 .22 251711 .34 253054 .90 253131 3 60 }54228 .40 255089 .40 256035 1.00 XR-2567CP Dual Tone Decoder $5.18 25531 18 552260 3.3 .12 261893 .36 2613055 1.00 263740 1.20 254235 180 255109 1.90 255376 .21 256037 .97 552270 36 .22 VOLTAGE REGULATORS 262102 AO 253375 6.30 263741 1.50 354237 1.20 255131 .20 255383 .5B 256076 .20 262160 1.50 .25 263771 2.40 .11 256099 80 N52289 3.9 .22 XR-1468CN Dual Volt Tracking 2533918 254238 1.10 255133 255397 2.50 N52290 4.0 ±15 262210 .26 .20 263)72 2.50 255134 .20 .30 256101 1.08 22 263392 254248 .21 2654113 552308 4.7 .22 Regulator . $3.84 2522180 .26 263393 .22 353773 3.90 .18 255172 .20 265419 .35 266103 1.10 2/44249 5231B 5.1 .22 .26 253414 16])89 3.00 255179 756111 BB 251219 .70 164250 .24 .50 155420 .40 N52329 58 12 XR-4194CN Adjustable Dual Tracking 262219A .76 1143418 .22 2531119 .40 20 265190 80 255447 .30 256122 .04 254256 551338 6.0 .22 252111 .20 253417 22 763873 .70 .32 255191 80 355448 20 256123 .88 Voltage Regulator $4.56 254758 rv52348 6.2 .22 2522210 .25 263410 1.00 253859 .22 264348 2.10 265194 80 255449 .75 256124 80 XR-4195CP Dual Tracking Voltage .fi8 55235B 06 22 ±15V 262772 .22 253442 1.80 263860 .20 1 265210 .15 255125 2144395 30 2645450 .10 N523613 7.5 .22 253553 1.00 253866 1.10 354400 .25 255219 .20 265451 .25 256126 88 Regulator . $3.38 262724.24 N5237B 11.2 .22 2538778 .29 355220 .20 256218 64 752368 30 253563 .16 254401 .25 2N54ti) 60 52388 87 .21 24 16 20 3N6I19 .00 OPERATIONAL AMPLIFIERS 251369 253564 253903 20 254402 80 255221 2N6158 A5 N52390 9.1 .22 .21 .W 268230 .50 Quad Contains 2524694, 26 263565 .16 253904 264403 .40 265223 .20 255484 N5240B 10 22 XR-3403CP Operational Amplifier $3.33 2143507 253905 .20 265225 .18 .70 256232 30 152475 60 214409 30 255490 5241B 11 .22 236 pages of 252484 30. 263568 256223 .30 XR-4202P Programmable Quad Operational 30 253905 22 2N4416 .90 255237 .24 2557)) 60 1352430 12 .22 2N2605 .50 54425 .32 1N6134 22 data, applications 263569 }743955 110 .35 2N5232 1N5]71 .55 552430 13 22 Amplifier .J4 $3.60 N2608 200 353630 :10 253957 1.50 254427 180 2552320 .35 IN5811 .40 1N6125 652350 14 22 253958 1.80 255249 XR4212 CP Quad Operational Amplifier $2.05 and cross reference 252646 .70 353638* .22 254858 1.00 .40 765817 AO 552450 15 21 95 353642 2539E2 .35 255294 .70 40 information. 26264) .20 254898 1.10 265818 1452468 16 .22 XR-4558CP Dual Operational Amplifier $0.86 2142713 25 263643 .20 253970 1.20 254918 .60 255296 .70 255819 45 N52470 17 XR4739CP Dual Low -Noise Operational ONLY $4.95 262904 35 253645 .70 254032 60 354919 50 255798 .70 255822 .58 552480 IB .22 552498 19 .22 Amplifier $1.15 65250B 20 .22 74L'S 74LS78N .92 74LS175N .80 .DIODES NEW from FLUKE MODEL 8020A 55251B 22 23 TIMING CIRCUITS 74LS83N 1.36 74LS181 N 4.92 N52520 24 .22 XR-320P Timing Circuit $1.52 74LS85N 1.40 74LS190N 1.50 N914 10/1.00 THE DMM FOR THE PROFESSIONAL N51531 25 22 5525413 27 21 36 74LS86N .46 74LS191N 1.50 XR-555CP Timing Circuit $1.07 74LSOON N4002 10/1.00 200 -Hr. Battery Life /- --_ 552559 28 .22 44 74LS90N .84 74LS192N 1.20 N52568 30 22 XR-556CP Dual 555 Timing Circuit $1.82 74LS01N 64003 10/1.00 26 Ranges for 7 Functions 1 74LS02N .32 74LS92N .86 74LS193N 1.21 54004 10/1.00 6525713 33 .22 XR-2240CP Programmable Timing Circuit $3.44 2000 Count Resolution 552588 36 .22 74LS03N .32 74LS93N .86 74 LS194N 1.32 N4005 10/1.10 XR-2556CP Dual 555 Timing Circuit High Low Power Ohms 652596 39 .22 $3.20 74LS04N 36 74L595N 1.00 74L5195N .99 54006 10/1.20 Autozero and Auto 5526013 43 22 INTERFACE CIRCUITS 74LS05N .33 74LS96N 1.24 74L51966 2.76 N4007 i0/1.20 polarity 552610 47 12 74LS08N 36 74LS107N 46 74LS197N 2.84 N52620 51 .22 XR-2200CP Hammer Driver $1.17 MOV protected 56 74LS09N .44 74LS109N 74 L5221 1.76 to 6000V 652638 .22 XR-2201 CP/ High Voltage, High Current against hidden transients N52640 80 .22 74LS10N .32 74L51126 .64 74 LS241 N 3.00 25 B405 .85 55265B 62 .21 and overload -2202CP/ Darlington Transistor Arrays $2.25 74LS11N .32 74L51136 .64 74LS251N 1.10 2SC536 2/1.20 protection 552869 68 12 to AC 552678 75 .22 -2203CP/ each 74LS15N 74LS114N .92 74LS253N 1.10 2SC828 2/1.50 300V 74LS2ON .44 74L5123N 1.10 74L5257N .95 Diode Test Function -2204CP 2SC829 2/1.50 WATT V PRICE 74 LS21 N 44 74161256 .60 74L5258N 1.10 2SC929 2/1.40 Conductance Function XR-2271CP Flourescent Display Drivers $1.15 74LS22N 44 74LS132N 1.44 74LS260N .44 541288 3.3 A4 2SC930 checks leakage resistance OTHER CIRCUITS 74L526N .33 741_51366 .74 74LS261N 1.90 2/1.30 54129* 3.6 .44 2SC933 1.00 to 10,000 maa ohms N4'300 3.9 .44 FM 74LS27N .44 74LS138N .99 74LS266N .71 547310 43 XR-1310P Stereo Demodulator $3.20 2SC1226A 1.25 Size HWL (7.1 X34X 1.81N.) XR-2264CP Proportional Servo IC $4.24 74 L528 N 33 74LS139N .99 74LS273N 2.66 (18.0 X 8.6 X 4.5 cm) 64733* 4.7 44 74LS30N .32 74LS145N 1.64 74LS281N 7.60 2SC1359 .90 647334 5.1 44 XR4151CP Voltage -To -Frequency Converter $7.50 2SC1973 1.30 Weight: 13 oz. ONLY 5169.00 N47348 5.0 .44 74LS32N 36 74LS148N 3.45 74LS283N 2.00 547350 0.1 .44 74LS33N .56 74LS151N .88 74LS290N 1.76 2SC1974 3.00 547360 88 44 74LS37N .50 74LS153N .88 74LS293N 1.76 2SC1975 3.10 PLESSEY SL1600 APPLICATIONS MANUAL 737.1 7.5 .44 74LS38N .58 1.50 2SC2034 3.40 Contains 114 pages circuit data, system design 144739* 8.2 .44 74LS155N 74LS299N 6.14 41394 9.1 4.1 5% CARBON FILM RESISTOR ASSORTMENTS 74LS40N .44 74 L51576 .88 74LS365N .70 2SD72 1.00 and technical data for SL1600 Series Radio Com- 547404 10 .44 Each assortment contains 5 pos each of 10 different values 74LS42N .92 74LS158N .99 74LS367N .70 2SD313 1.10 munications Integrated Circuits. 547411 11 M 74LS51N .44 74LS160N 1.25 74L5374N 3.21 54742.4 12 .44 Values included are shown in (Ohms) 2SD325 1.25 $1.95 .44 74L554N .44 74LS161N 1.25 74LS375N .81 %Wan 5%ássortments $1,75 ea.. %Wan 5% assortments $1.85 ea. 541Nau15 .44 74LS55N .44 74L5162N 1.25 74L5378N 1.60 547451 16 M Anil: 10, 12, 15, 18, 22, 27, 33, 39, 47, 56 74L573N .46 74LS163N 1.25 74LS381N 4.56 SAM'S BOOKS 541460 18 .44 .46 1.50 .72 Miniature TTL COOKBOOK N4747.1 20 .44 Asst.1A: 11, 13, 16, 20, 24, 30, 36, 43, 51, 62 74LS74N 74L5164N 74LS386N 647480 23 44 74LS75N .70 74LS170N 3.20 74153996 2.15 No. 21035 0 8.95 64149.1 74 .35 Asst.2: 68, 82, 100, 12,0, 150, 180, 220, 270, 330, 390 74LS76N .56 74L5174N .80 74LS670N 3.95 Toggle Switches IC OP AMP COOKBOOK 547500. 27 .44 No. 20969 512.95 547510 30 .44 Asst.2A: 75, 91, 110, 130, 160, 200, 240, 300, 360, 430 SINGLE POLE DOUBLE THROW 647520 33.44 TV TYPEWRITER COOKBOOK 54153.1 36 .41 680, 1K, 1.2K, 1.5K, 1.8K, 2.2K, PLESSEY SAMPLER 7101 .99 Asst.3: 470, 560, 820, 2.7K 710310ENTER OFF/ 1.84 No.21313 5 9.95 544 9 .4t
CAPACITORS J . 300 METALIZED POLE DOUBLE THROW 647558 Asst.3A: 510, 620, 750, 910, 1.1K, 1.3K, 1.6K, 2K, 2.4K, 310 DOUBLE C-MOS COOKBOOK N47564. 4) .44 18 DIFFERENT STD. VALUES 7201 224 No.21398 5 9.95 54057.1 51 .s i Asst.4: 3.3K, 3.9K, 4.7K, 5.6K, 6.8K. 8.2K, 10K, 12K, 15K, 18K $26.00 720310ENTER OF Fl 2.56 TRANSISTOR SUBSTITUTION rv41580 58 44 rv4159* 62 .44 Asst.4A: 3.6K, 4.3K, 5.1 K, 6.2K, 7.5K, 9.1 K, I1 K, 1311, 16K, 20K Ed. HANDBOOK, 15th N4760A 6B . Asst.5: 221, 27K, 33K, 39K, 47K, 56K, 68K, 82K, 100K,120K 1.032 SOLDERLESS PLUG-IN TIE POINTS No. 21169 $ 4.50 617610 78 .44 ACE 201-K CAPAC TY: UP TO 1214 -PIN DIP's TRANSISTOR SPEC MANUAL, 7th Ed. Asst.5A: 24K, 30k, 36K. 43K, 51K, 62K, 75K, 91K, 11011,130K Two 5 way binding posts Part No. 923334 No. 21208 $ 5.95 SPECIAL Asst.6: 150K,180K,220K,270 K,330K,390 K,470K,560K,680 K,820 K Size: 4-9/16" by 7" SEMICONDUCTOR REPLACE GUIDE Kit form No. 21092 S 3.95 FAIRCHILD Asst.6A: 160K,200K,240 K,300K,360 K,430K,510K,620 K,750 K,910 K \.41'ké, He the larger of the BUILDING AND INSTALLING LM741PC Asst.?: 1M, 1.2M,1.5M,1.8M,2.2M,2.7M,3.3M,3.9M,4.7M,5.6M ELECTRONIC INTRUSION ALARMS two kits in the ACE series .. 3 for $1.00 Asst.7A: 1.1M, 1.3M, 1.6M, 2M, 2.4M. 3M, 3.6M, 4.3M, 5.1M, 6.2M for larger cvcuil-building capac- No. 20929 S 4.50 ity. The matrix is 1032 solderless, IC OP AMPS (%Wan assortment No. 7 does not include 5.6M1 UNDERSTANDING plug-in tie comprised or 192 sep. No. 15watt assortment No. 7A does not include 5.1 or 6.2M1 points 20855 $ 3.95 8 -BIT OTO A arate 5.tie.polnt terminalsand 2 distnbu HOW TO USE IC LOGIC ELEMENTS Asst.8: of Asst's 1, 2, 3, 4, 5, 6 and 7) CONVERTER (Consists on buses, each with 9 connected 4 -lie point 2nd Ed. Asst.8A: (Consists of Asst's 1A, 2A, 3A, 4A, 5A, 6A and7A) terminals. Buses are typically used for voltage and No.21081 $ 4.50 DAC-08CN ground distribution. Assembly instructions included. Asst's 8 or 8A- %Wen $10.95 Mutt $11.55 UNDERSTANDING CMOS IC's No. 21129 S 4.95 ONLY $5.15
84 POPULAR ELECTRONICS
AmericanRadioHistory.Com INTERSIL 8031 AUDIO POWER AMPLIFIERS m PRECISION WAVEFORM 5.5 WATT AN315 GENERATOR AND VCO I. QUITE PORTABLE Designed for mobile remos. tape For simultaneous dne, square ana Oilmen, Easy to use. High r yangular wevetorma 001 Ha to Hooks VERY AFFORDABLE Ga 63 t dB (Closed Circuid. 8.2 haveE been designed and field tested through the Industry to save I MHa. time and money in commercial electronic and servicing. The 5390e production PART NO. 8038CCPD 58.10 m spring -loaded hook attaches firmly, yet so gently it will not damage compon- AND UNBELIEVABLY ent - frees hands while testing. Durably constructed and fully insulated to e single contact point assuring true readings. Meets exacting laboratory and VERSATILE space age Computer technology requirements. AVAILABLE IN 10 RETMA the PET n COLORS: Red, black. blue, green, oragne, yellow, white, violet, brown CAPACITORS or gray. computer 50V CERAMIC DISC 51.00 Per Package 5pf 9/pkg 300pf 7/pkg .0047mfd 9/pkg may very well 15pí 9/pkg 33081 7/pkg .005mfd 9/pkg MICRO HOOK 2501 9/pkg 390pf 7/pkg .01mfd 9/pkg Jumper with XM be a lifetime 2781 9/pkg 47001 7/pkg .015mfd 8/pkg XM Micro Hook 11,75" tong 47pf 8/pkg 560p1 7/Pkg .02mfd 8/pkg <1 gram) for difficult IC Testing. Micro Hooks investment 68pf 8/pkg 680pf 7/Pkg .022mfd 8/pkg Permits hookups to delicate wires PET Order No. Length Price 10001 8/pkg ,001mfd 9/pkg .03mfd 8/pkg where weight and leverage may 204XM-12' 12" 51.80 15001 8/pkg ,0015mfd damage component 9/pkg .039mfd 7/pkg 0 ea MODEL 2001 5.135 204XM-24 24" 51.80 22081 $(Pkg .0022mfd .047mfd 7/pkg Specify 9/pkg color. ORDER P/N XM Specify color 27001 7/pkg .003mfd 9/pkg .1mfd 6/pkg SPECIFICAT10Ns PET PLESSEY POLYESTER MINI BOX DIMENSIONS Lwu 191/2. 161/2 a 14 2001 XM.S MICRO HOOK SET unes des 1 ea. rea. black, blue. green, WEIGHT 44151 MODEL MF V S MF V S MF V Orange, yellow, white, brown, violet ed gray Micro Hook). At this low MEMORY .001 1000 ,14 .012 630 .14 15 100 .20 1000 400 pace you Can afford more than one set. RAM luxe/41(18K OPT) pp to 32K .0012 14 .015 .15 18 100 .21 with 41K 1000 400 COMPLETE SET (10) MICRO HOOKS 58.45 ROM 0aldem operating weer. 114K $595.00 RAM .0015 14 .018 .15 .22 100 .23 860 -BASIC interyreter .0018 1000 .14 .022 400 .15 .27 100 .26 ñ 4K-Operuirip system $795.00 with 81K RAM .0022 1000 14 .027 400 .15 .33 100 .30 MINI HOOK 1 KDagn0nk routine .0027 1000 .14 .033 250 .15 .39 100 .33 1KMechine language monitor .0033 1000 .14 .039 250 .15 .47 100 .36 VIDEO DISPLAY UNIT ,0039 630 .14 .047 250 .15 .56 100 ,44 N X100W Mini Hook (2.25 long) Jumper with X -100W 9" t w tgh r n CRT 1000 char display 40 col by 25 lines uno dot mulct lo- .0047 630 ,14 .056 250 .15 .68 100 .47 charactersand e . c gapnxt Auto sc rolling Iron bottom 01 Winking curar with .14 ,068 250 .82 100 .54 combines rugged construction, minia- Mini Hooks Iva .0056 630 .15 mtin control noReverse held on all c haracteis 64 standard ASCU char: 64 grmha char, .0068 .082 1.0 100 ture and Finger.eae Hypo Action No. 630 .14 250 .17 .60 Order Length Price KEYBOARD .0082 630 ,14 .1 100 .17 toer all the best test e octiona 204-12W 12" 51,70 81/2- wide 0 3" deep: 73 keys All 64 ASC U chernctera available wilhaut shift Glculatoa style .01 630 .14 .12 100 Hook is large enough .18 or component 704.24W 24" 51.70 numeric key pad MI 64 graphiand reverse field characters a¢Mible Iran keyboard (with china leads, vet small enough to Into Screen' Gmrol Clear end tametamer..rn get Specify color. erase Editing: Cha,actar and asuarn MATSUO DIPPED TANTALUM tight places S.80 ea CASSETTE STORAGE alCalfdral MF V 5 MF V S MF V Specs Fast redundant recording she assuringi reliable data recova ^ghre ORDER P/N X100W odardrive d .1 2.2 10.0 CU co rellabilny of recording and record etch robe immunity, ,. 35 .33 20 .33 35 .90 lor/y ieaand .15 2.2 correction Jsen audlq cassettea loPal Tape Ides named. 35 .33 35 .40 15,0 20 .45 .22 35 .33 3.3 35 .42 15.0 35 1,32 Jumper X.100W Mini Hook Jumper with X -100W Mini OPERATING SYSTEM 4.7 9 .33 35 .33 35 ,45 22.0 16 .45 SupporsyCeInts multiple Mechoe to Stacking Banana Plug Hook language accessibility File management In apeslm .47 35 .33 6.8 16 33.0 20 1,32 Order No. Length Cursor control, reverser held and peehlbl under smote BASIC conrol Cassette file .40 .68 35 47.0 201%M 32" managementmana mnt from BASIC wTrue random number genetatM or pseudo random sequence. .33 6.8 35 .45 20 1,53 Order No. Length Price 1.0 16 INPUT/OUTPUT 35 .33 10.0 16 .42 68.0 1.62 20101 Price 1.5 35 .40 10.0 25 .45 32" 51.45 INPUT/OUTPUT Specify color. 51.50 I All ether I/O supported rnrouac IEEE -488 instrument interface which allows for multiple intelli 1% MICA 500V pent peripherals All 110 aulommleally managed by operating system o ftwae Single cba ter I/O with GET commend Earn screen Iine-acit capability Flearble 1/0 structure allows 51 PF .29 220 PF Al 1500 PF ,60 rt puzzling for BASIC expansion with intallgenr peripherals. 62 PF .29 240 PF ,46 2000 PF .90 BASIC INTERPRETER 75PF.29 300 PF .50 2200 PF ,94 Expanded 8K BASIC Upward expansion from current popular BASIC language Strings ups- 82PF.29 390 PF 50 47000F 1.80 EXTRA LONG MINI HOOK et, and named., arrays N gn.pr.cisno 110 fa:mil:capitalnt Direct mero r aug y access 100PF.30 470 PF .50 5100 PF 1.80 %L-1 Mini Hook 15.0" long) combines all the proven features of the X10000 PEEK and POKE commands 120 PF .32 620 PF .52 10000 PF 360 with en extra long body. It will make sale, short -tree test connections In ALLOW 60 TO 90 DAYS DELIVERY 150 PF .35 PF .53 card racks and ahough deep wiring nest up to a" . , ORDER P/N XL -1 820 180 PF 41 1000 PF .60 tiWi Specify color. 51.30 QUALITY 01 31/2 PARTS Intersil DIGIT RESISTOR KITS CARBON FILM RESISTORS 15%1 JUMPER, XL -1 MINI HOOK TO STACKING BANANA PLUG Only in Multiples of 5% CARBON FILM 100 pct value lobms) Older No. Length per PESISTORS 4W ... $1.69 per 100 201X L1 32" PANEL D METER . 06W 51.79 per 100 '-".41111.10 Specify PliCe ll1JJJ Color. 10 100 1.0K 10K 52.05 100K 1.0M 11 110 1,1K 11K 110K 1.1M 12 120 1.2K 12K 120K 1.2M COSMAC MICROPROCESSOR Integrated Circuit Jo. 13 130 1,3K 13K 1306 1.3M LCD 15 150 1.5K 15K 150K 1.5M -6 Volt Op. COP1924C0 7,2j9 Static CMOS 16 160 1.6K 16K 16060 1,6M hating Range 57.75 RC/1 18 180 1.8K 18K 180K 1,8M COPI802CD COSH AC CPU 519.95 COP1852C0 Byte I/O Pon 8.25 20 200 2.0K 70K 200K 2.OM COP1821C0 1024x I Static CMOS COP1856C0 e COMPLETE WITH 22 220 2.2K 22K 2206 2.2M Ram 14.75 ffue='tor/Buller 5.50 or STORAGE BIN 24 240 2.4K 2460 240K 24M COe1822CD 256 e 4 Static CMOS beeW 27 270 2.7K 2710 COPI857CO ilygeperator/Bulf.r 1/4 270K 2.7M em 15.50 5.50 WATT KIT 30 300 3.0K 30K 300K 3.OM 42 Different Values 33 330 3.3K 33K 330K 3.3M LED (680 to 4.7 Min) 36 360 3.6K 36K 360K 3.6M KIM -1 MICROCOMPUTOR 20 Each Value 39 390 3.9K 39K 390K 3.9M J.410 43 430 4,3K 43K 43010 4.3M 1/2 WATT KIT Al 470 4.7K 47K 470K 4.7M KIM-1-Compulor Module Irvin MOS % 42 Different Values 51 510 5.1K 51K 510K 5.1 M Technology. IK RAM, 26 ROM tsn q'y 56 560 5.6K 56K s 168ái to 4,7 MS2) 5606 5.6M tinning mm aseCutive, congaed KITS 62 620 6,2K 62K 620K 6.2M mum 20 Each Value audio cases interface. 15 billies. 68 680 6,8K 68K 680K 6.8M 75 750 7,5K 75K 750K 7,5M donal I/O liner,.24 key keyboard 1/4W - $24.90 PER KIT 82 1320 BUILD A WORKING DPM IN 1/2 HOUR WITH 1/2W $25.90 PER 8.2K 82K 820K 8.2M and e sla.drgit LEO display, - KIT 910 9.1K 91K 910K 9.1M THESE COMPLETE EVALUATION KITS Documsntstion-K11.1.1 Oars Manua MN60a0 CMOS PLL a single. Test - 6500 Hardware Manual, and 6500 Pro these new parts for yourself with Intersil's low cost SGS.ATES - AUDIO chip plase'locked loop intended grooming Manual. prototyping kits, complete with A/D converter and LCD display POWER IC'S AMPLIFIER for use as a frequency synthesizer (for the 7106) or LED display (for the 7107). Kits provide all Fully Assembled Only TBA800 5 watt 51.95 inCO transceivers and other materials, Including PC board, for a functioning panel meter. TBABTOS communications equ ipmenl, Fully Tested $245.00 7 watt 2,10 ICL7106EV (LCD) $29.95 ICL7107 (LED) $24.95 TBA8TOAS 7 watt 2.10 57.90 TB1 820 2 watt 1.35 TO 220 VOLTAGE 71348305 4,2 watt 1.95 REGULATOR FROM HYBRID FOR 2000. TCA940 10 SOCKET FOR lob watt 3.30 FAIRCHILD A -S19 595 TDA2C102 4,20 7805C AUDIO SANKEN 8 watt 5V 7815C 15V FOR 304 Sow, TDA2010 12W Hi -FI 5.25 7806C 6V 7818C 18V AUDIO AMPLIFIERS POWER AS1to 595 TDA2020 20W HI -Fi 6.00 7812C 12V 1-1 I 7824C 24V eft 2 for 51.20 g AMPLIFIERS 'kb pweicawarmaxmompak aroo Multi -purpose linear amplifiers for comercial and indus. trial applicacations. DIP SOCKETS Less than 0.5% harmonic distortion at full power level. 1/2 dB response from 20 to 100,000 Hr. _' LOW Single or split (dual) power supply. PROFILE Rugged, compact and lightweight packages. SOLDER TIN Built-in current limiting for SI -1050G and efficient heat Send Cheolc or Money Order to: P.O. Box 2208P. Culver City, radiating construction. Calif. 90230. Calif. residents add 6% sales tax. Minimum Order 1.24 25-49 50 UP 510.00. ADD $1.00 to cover postage and handling. Master SANKEN Series SI TYPICAL CONNECTIONS -10000 amplifiers Charge and Bankamericard welcomed (include your card are sell -contained 5I-10500 8 Pin .16 .15 .14 power hybrid am- WITH SPLIT SUPPLY number and exp. plifiers for 14 Pin .19 .18 .17 dale). designed Hi -Fi, stereo, 16 Pin te 21 .20 .19 TELEPHONE ORDERS: Call 1213) 641.4064 musical instruments, public address 40 Pin .62 .61 .60 systems and audio applications. other CANADA, B.C. The amplifiers VISIT ONE OF OUR STORES have quasi -comple- ANCRONA mentary class B output. The circuit STANDARD TODAY 5656 Fraser St. employs flip-nhlp transistors with SOLDER ANCRONA STORES DO high reliability and passivated chip GOLD Vancouver, B.C. isl i,~.. NOT ACCEPT MAIL OR V5W power transistors with excellent sec- 2V4 ondary breakdown strength. Built-in TELEPHONE ORDERS (604)324-0707 8 Pin .30 .27 .24 current limiting is provided for SI - 14 Pin .35 .32 .29 CALIFORNIA CALIFORNIA ARIZONA 1050G and all devices can be oper- 16 Pin .38 35 .32 ANCRONA ANCRONA ANCRONA ated from a single or split power 40 Pin 1.75 1.59 1.45 11080 Jefferson Blvd. 1300 E. supply. Edinger Ave, 4518 E. Broardway Culver CIty,CA 90230 Santa Ana, CA 92705 Tucson, AZ 85711 - (213) 390-3595 (714) 547-8424 (602) 881-2348 51.1010G 110W output) ... S 6.90 WIREWRAP $1-10200 . - . Ir 120W output) 513.95 4/111111111R GOLD OREGON GEORGIA TEXAS 51.10300 . - - a - (Level No, 31 130W output) 519.00 se ANCRONA ANCRONA ANCRONA 51.10500 150W output) ... 527.80 1125 N.E. 82nd Ave. 3330 Piedmont Rd. NE 2649 Richmond Portland, OR 97220 Atlanta, GA 30305 Houston, TX 77098 as 14 Pin .39 .38 .37 Data Sheet with Application Notes - $0.50 16 Pin .43 .42 .41 (503) 254-5541 14041 261-7100 (713) 529-3489
JANUARY CIRCLE N0. 4 ON FREE INFORMATION CARO 1978 85
AmericanRadioHistory.Com 80000069 I and II 817.00 Per set 7400N TTL 1/1 BUGBOOK® h Peter A. Reny. Pene 6. Cartoon. Ylwxya HOBBY -WRAP TOOL-BW-630 frF Continuing Education Sedes as rem 6 era n weIhern whim resoraade 'als bee«Il Wed t o 9118¡049 096 ehm4ne[isms 10 yll1 m H wnWW 1010 mxrpgw59r sr4uml re Marc conc.., 01 SN7400N i6 S4747214 .39 54741604 1.25 3 A-y- Battery Operated (Size C) 1 0 9 61ng lnp.n1M'Ilat gaol. 54740114 .18 5474734 .39 S47416114 .99 11w,. 95,,14ee:roen«olmos LEO 40,14R4MI, 14ÓM mamuonamlyWmare - Weighs ONLY 11 Ounces SN7402N .20 S474744 .35 59741624 1.95 . -!\ ,99 Wraps 30 AWG Wire onto SN7403N .20 9474154 .50 5414163N the 8UOBOOK IIa 55.00 514741644 .99 51474044 .20 51474764 35 Ipr..KIII . 9y PelscA. Roo, 07510 Wyss. W114114 $34.95 Standard DIP Sockets (.025 inch) SN7405N .20 9474794 5.00 S4741654 99 aeww CART cep- Inn a, mpemm not eomed. 1.25 tnanerma Complete with built-in bit and sleeve 54740614 .35 5414809 50 S47416614 mime ét rent ears termpá, ei and roo worwienimuteraalmcarers SN7407N .35 5474824 .99 51474161N 3 25 current bops. aryl M NS 232C «enact standard Pan r momme.0 to am RTTY enthusiast 94740814 .20 5474834 .70 S4741104 2 10 6 00 51474094 25 54748514 .89 947417211 THE 555 TIMER APPLICATIONS 36.95 BUOB004 III 515 00 WIRE -WRAP KIT WK -2-W 1.50 ase Sonalosn A. asa. SN1410N 20 9474864 .39 514741734 SOURCEBO OK WITH by Pee.11 Pen 6. Lam, - EXPERIMENTS 9474114 .30 5474884 3.50 54741746 1.25 es N iMere Rat a all Moeller Bewees As, much w,i.0. Ian WRAP s Inns . STRIP . UNWRAP ;8$¡ 51474124 .35 51474894 2.49 S4741754 99 b. root N Andneto use Included are over sr. ono 0e.Mmnn in when IN .eww. 9mpxtex wOores too Man a0 mero9mpuur. a Tool for 30 AWG Wire 54741314 .69 S07490N .45 54741764 79 Im va4446 an on N[mbues. morons and graphs . omits "19r.í0.9* wash Om one 1Iroduws rota a me W en. pew., power supq.% me wen unmet Imenawe system 5 N reaommend9 ma s1u wee Inc wa- 5474104 .70 5414914 .75 5474177N 79 Roll of 50 Ft. White or Blue 30 AWG Wire IM Inc none and wlomwm1 900109 4901., music. an don onlfa .00000X516 II Ware wawa«g .m BUG800 Ill .35 5414924 S4741194 2 49 94741619 .49 tar Prone 50 pcs. each 1", 2", 3" 8 4" lengths 35 54741804 99 BUGB00. Se and 91 $19.00 per sol - 54741714 5474934 A9 INSTRUCTOR'S MANUAL 53.00 5414181N 2.19 9 onto 0. R. Reny. A. LI pre -stripped wire. 94742014 .20 0414944 .79 Necessary Iao9 I end IL Answers guenrona regam,np EsPenments n e9nl eerw6s. 80300 er pro4mmmp n d 9474214 .39 5474954 .19 94741829 .95 rm * 944«nor waxer pMwoonr 0 au...app oachb , An o wen-mar asta A 60.16 microcomputer «red. lteáeW agv0ch S14741814 1 95 Mg Ms must for 9n.le4N,rq immduali SN7422N A9 514749614 .79 en./ $11.95 Ws e 41. .boob manato ap al t S14741854 1.95 'nom SN7423N .37 541491N 3.00 OP AMP MANUAL 59.00 60,00* v, megetss the digitalm aercags 01 3^43009 v ente a «010,44 of S147418614 15 00 mi and mN emg Nut 6 asee n 5474259 .29 54141004 1.25 men00cube 0r dpem,dn, mqf,, peer n noon. 0l0Me*10 Uta ° 4 WIRE WRAP TOOL WSU-30 94742614 .29 9174107N .39 S47418714 6 00 awe 900n 514741884 3 95 CMOSM DESIGNERS PRIMER 56.00 WRAP 5474274 37 54741094 .95 DRUG « $5.00 - STRIP UNWRAP -55.95 SN7429N .42 S47411611 1.95 54741904 1.79 98400000 0010 +Mer0retwe *009304, A preonm In 86 POPULAR ELECTRONICS AmericanRadioHistory.Com m BREAD BOARD Eacnkilco^wins 35o wit 'he Incredible. cut to 14 different lend, MICROPROCESSOR COMPONENTS r NJUMPER WIRE KITlromo.l-1°5.0. 8080A CPU $16.00 CDP1802 CPU 519,95 Each retie is slopped and 'Pennywhistle 103"011111 4.95 MC6800 8 Bit MPU 24,95 the leads are bent 90 for 8212 8 Bit Input/Output m LISP easy Insertion. 8214 Priority Interrupt Control 15.95 MC6820 Periph. Interface Adapter 15.00 Wore length is classified 8216 Bi.Directional Bus Driver 6.95 MC6810AP1 128 4 8 Static RAM 6.00 by c0 cong.di i0e0 8224 Clock Generator/Driver 9.95 MC6830L8 1024 x 8 Bit ROM 15.00 $129.95 Kit Only Al wire Is solid tinned 22 t' n gauge with PVC msumpn. 8228 System Controller Bus Driver 10.95 Z80 CPU 29.95 The Pennywhisne 103 is capable of recording den° and horn audit tape vnlboul The wires come packed in RAM'S critical speed requirements for the recorder and d rs able to commumca,e erectly 1 49 ...510.00 kit a convement plastic hoe CPU'S 1101 256 I 5tarn 5 mth another modem and terminal for telephone hamming'' and CMrmumralions JK1. / 4 Static 5 95 B ROA Super 8008 16.00 2101 256. Mr the deal In addition. II rs tree of cebcal adiusrmenis and is burg mth non'oreoiswn, 2,02 102: I Static 1 7' readily available Matesa. withposts twoon 2650 e BIT KM 26 50 pans rows of .025 -of sq..100or 4 P8085 CPU 29.95 2107 5280 4096 1 Dynamic 95 Data Transmission Method FresuencySo,lr Keying, lull -duplex (nall.duples patterns 2r11 256 a slaw 695 SOCKET SR'S :489 16 a swot 2 49 centers and shielded receptacles. 2504 1024 Cr^ame 5395 Maximum D Bab 30 8101 Slahc 5.95 Return to mark level rebuffed oc'Probe access holes in back. 2518 s 3291T 00 256.1 Data hrra, Choice JUMPERS 6111 256 . a Sure 6 95 between each 25,9 He. 4C BR a00 of 6" or 18' length. 8599 a staffs 3 a9 H, for mark. 2522 Dual 132 Be ssR 2.95 e Receive Channel Frequencies 2025 H, for space. 2225 2110291102 1021. I Static 1 25 selectable. Low (normal) 1070 space, Part No. No. of Contacts Length Price 2523 512 Oyname 1.95 Transmit Channel Frequences swilm - 0 -1200 756 I Sule b 95 1270 mask Nigh - 025 space, 2225 mark 924003-18R 26 18' S 5.38 ea. 252s 1024 Dynan,/ 3.00 93421 256 I Slabs dbm accoustically coupled, 252' Dual 256 Bil 3 95 Receive Sensitivity46 924003-06R 26 6' 4.78 ea. 1MMs262 2K . nor ?0o, nominal. Ada/Maple Iron 6 Ohm 2529 Oual 512 BIT a00 rNmK Transml Level 15 dem 40 ea. UPD414(210414K Dynamic 16 Pin 5.95 924005-18R 18" 8.27 2532 Coact PO 817 3 95 is -20 Om.. PROMS adiusls to 40 6' 7.33 ea. 2533 '020 Static 595 Receive frequency Tolerance Frequency reference aummaucally 924005-066 95 170243341 2018 Samos S 9 allow for operation between 1800 H, and 2400110 50 18' 10.31 ea. Filo 695 924006-18R Spa 76+8 14 95 mA flop Is 7415670 16 a eno 3 95 Digital Dale Interlace EM RS -2320 or 20 current (rearva 50 6" 9.15 ea. 82523 32. Open C sop 924006-06R wets opmisolated and nompolar). 825123 328 leostair 500 Power Requirements 120 VAC. single phase. 10 Walls Solder to PC boards for instant an 5 1013 lox Blur 55.95 24528; 1024 SI - 95 Physical All components mount on a single 5- by 9' RAM'S s 4 a 3 95 ,_jJUMPER plug-in access via socket -connector 3603 256 East pooled oirourl board. All components included 2513(2140) Char Gen ,upper Case 5 9.95 17708 rorn 19951 jof Sts. Choice Requires a VOM. gods Oscillator, Fregency Counter and., Osoposcope to align. 2513130211 Char Gen -lower case 9 95 2716 16K rom 34 95 straight r2r5ight a HEADERS anq 2516 Char Gen 10 95 6301.1 1024 Tpii.Slale ELpola, 3 49 MM5230 2048 BIT (512 4 4 on 256 a 8) 1.95 6330-1 256 Open collector &Wear 2 95 AM/FM 8 -Track Stereo Receiver Part No. No. of Posts Angle Price R( 923863-R 26 straight $1.28 ea. SPECIAL REQUESTED ITEMS CLOCK CHIPS With BSR Changer 923873-R 26 right angle 1.52 ea. 1.161530i 5; 95 FCM3817 55.00 11090 19.95 7205 19.95 9368 3.95 MM531, 95 PLL System 923865-R 40 straight 1.94 ea. ICM7045 46.3.8500.1 B 95 4533 3.95 24.95 L01101111 25.00/set MM5317 4 95 BSR Record Changer 923875-R 40 right angle 2.30 ea. 8T20 7.50 ICM7207 7.50 951190 11.95 a AY -5-9100 17.50 MM5314 95 Slide Controls 923866-R 50 straight 2.36 ea. AY -5-9200 14.95 8197 2.00 ICM1208 22.00 MC3061P 350 MM5311. 6 95 4.95 800165 7.95 ICM7209 7.50 MC4016(74416) 7.50 MM531.: Automatic AFC Control 923876-R 50 right angle 2.82 ea. AY -5-9500 9 95 AY3.2376 14,95 MCM6571 1350 01(50240 17.50 MC14113L7 8.95 005369 2 95 4 Speaker Output 9374 1.95 MCM6574 13 50 050026CH 3.75 MC140318 9.95 MM564' 9 95 Walnut finish vinyl covered MCM6575 1350 11L308 1050 INTRA-CONNECTOR 825115 25.00 C17001 5 95 wood veneer with smoke Provides both straight and right angle functions. Mates ARATRONIC dust cover __._ Size: 20'W x x 151/4"D with standard .10" x .10" dual row connectors (i.e. 3m, Ainsley. Featured on February's Front Cover of Popular Electronics 98"H etc.) Permits quick testing of Inaccessible lines, ' ' TI" Model 8365 Logic Analyzer Kit Model 100A $149.95 Pan No.: 922576-26 No. of contacts: 26 Price 56.90 ea. Model 100A DIGITAL STOPWATCH INTRA-SWITCH $229.00/kit . Bright 6 091 LEO Deploy Times to 59 minutes 59 59 seconds Mnae1 100A assembled Permits instant line -by-line switching for diagnostic or OA 5295.00 . Crystal Controlled Time Base testing. Switches actuated with pencil or probe tip. Mates with Analyzes any type of digital system . Three Stopwatches n One Times Single Event Spill a TO,. standard .10" x .10" dual -row connectors. Low profile design. Checks data rates in excess o1 8 - Site 45"1215 ..90 (4N ounces) Switch buttons recessed to eliminate accidental switching. ablIVU million words per second uses 3 Petiole Cells Some applications are: Part No.: 10.26 No. of conla cis: 26 Prise 513.80 ea, Trouble shoot TTL. CMOS. OIL. RTL, Troubleshooting microprocessor Kit - $39.95 Schottky and MOS families - address, instruction, and data flow Assembled Displays 16 logic states up to 8 digits wide - $49.95 contents of ROMS CRYSTALS See ones and zeros displayed on your -Examine Heavy Duty Carry Case $5.95 - THESE FREQUENCIES ONLY -Tracing operation of control logic CRT, octal or hexadecimal format Padi-- Frequency Case/Style Prlci -- conditions -Checking counter and shin Stop Watch Chip Only (7205) S19.95 CVIA 1.000 MHz HC33/U Tests circuits under actual operating 55.95 register operation MHz HC33,U Easy to assemble -comes with step-by-step construction CV2A 2 000 55.95 Monitoring I/O sequences manual which includes pages logic analyzer operation. - 1'12.01 2.010 MHz HC331U 51 951 80 on Verifying proper systemoperations 31/zDIGIT DPM KIT CY3A 4 000 MHz HC18 U 5"I I 5495 (Model 100A Manual - 54.95) diving testing CY7A 5 000 MHz HC184.1 54 95 mum «Om :mum CY12A 10.000 MHz HC18 U 5495 PARATRONICS TRIGGER EXPANDER - Model 10 Model 10 Kit -5.129.00 CY14A 14 Deis MHz HC18U 54,95 Model l0 Assembled - 5295 00 Adds 16 additional hits. Provides digitalg delayand 0qualification of Input clock CV19A 18 000 MHz HC18 U 54 95 110 Ma 59.95 and 24011 trigger rwor0.-Connects direct to Model 100A for integratedled UOlq. Model Cv22A 20 000 MHz HC18'U 5o 95 lit Manual -14.95 CV309 32 000 MHz HC184U 54 95 31/o-Oiglt Portable DMM =0= 426y CONNECTORS Overloal Protected 100 MHz 8 -Digit Counter 3' high LEO Display 20 110-100 MHz Range Four power sexes, I.e. PRINTED CIRCUIT EDGE -CARD Balm, or AC operaign .5- LEO Display batter, 110 or 2203 wile New B ipolar Unit Auto Polarity .156 Spacing -Tin -Double Read -Out Auto zeroing Crystaltontraled amebase charger 12v vim auto Power Fits to P.C. Cards 1m., Iva. 0.1 ohm resolution Auto Zeroing Low Bifurcated Contacts - .054 .070 Fully Aulomatk lighter adapter awl external Portable .5" LED Single IC Unit 15/30 PINS (Solder Eyelet) 51.95 - ccmplelely 7 2.103 power a'pni pen pm ,moendence 18/36 PINS (Solder Eyelet) $2.49 seu.cmMined MAO -100 DC Accuracy IT typal Sue -1.75-a 7.35 $134.95 Model KB500 DPM Kit $49.00 44 PINS (Solder $2.95 K 22 Eyelet) Ranges: DC Voltage -0.1000Ví 5.63' Model 311D -5C -5V Power Kit $17.50 50/100 PINS (Wire Wrap) $6.95 Ac vmugr o.i00ov Erect Reseonse 50.400 82 50/100A 1.100 Specula) PINS (Wire Wrap) 56.95 nceCur 0-10-100mÁ 14.123111M ,JE700 CLOCK Resistance 0-10 died Wm 25 PIN -D SUBMINATURE (RS232) * The JE 700 is a low cost dpdal Cinch. but Sim 64.14 n-47 4 very mph guard. unit The unit lea- DB25P PLUG 53.25 2 5 3: Model 2800 Accessories: hoesa senurated watnur On t role dr. DB25S SOCKET $4.95 ACCESSORIES FOR MAX 100: enenSeenS M6 .2', .1 AC Adapter BC -28 59.00 MAN72mg brphlness readoutut and the 599.95 Mobile Charger El minalor Rechargeable 095314 cIWA chip Comes wim lest use power from car battery Model 100 -CU 53.95 12 or 24 Hour 205 -CB - H EAT leads. operahng ma,aat Batteries BP -26 20.00 Cbarsor/Ellminato SINKSO"'75A and snare ruse Carrying Case LC -28 7.50 use 110 v AC Model 100 - Col 59.05 KIT ONLY 115 VAC $16.95 205 -CB Beryllium Copper w -black finish for TO -5 S 25 291-.3611 Aluminum for TO -220 Transistors 8 CONTINENTAL SPECIALTIES PROTO CLIPS .R'5 e: o HEXADECIMAL Regulators S .25 Other CS Proto Boards 14 PIN PROTO BOARD 6 $4.50 '5 3 E. ENCODER 19 -KEY PAD 680-.75A Black Anodized Aluminum for To -3 91.60 PB100 - 4.5" x 6" $ 19.95 16 PIN 4.75 515.95 .7 - Dude 4 Black Anodized Aluminum predrilled S 5 q - X wide) P6101 - 5.8" x 4.5" 29.95 PIN (6" long 4" 24 8.50 ABCDEF mounting holes for TO -3 444 x 14. z 51.75 - 2' PB102 - 7" x 4.5" 3995 40 PIN 13.75 9 -` .a 1 5 Shift Key iris PB103 - 9" x 6" 59.95 Etching Kits ¡cannot be sere air) DESIGN MATES O A 2 Optional Keys P0104 9.5" x 8" 79.95 32 X A-1 P C Etch Materials Kd 529.95 ea. DM1 Circuit Designer - enough for 5 Ncud Wards RA PB203 - 9.75 x 61/4 x 21'4 80.00 $10.95 each $69.95 PB203A 129.95 27 X 4-1- Elonee C,rcun Kit S 9.95 ea. 9.75 x 6v2 x 215 (mtludes DM2 Function Generator Comolele ka - only add water poesy supply) P(ugboards $74.95 6 5 x 4 5% Ir16 Epory grass S 6.95 ea. INSTRUMENT/CLOCK CASE 3662 LOGIC MONITOR DM3 - RC Bridge PPane,n-44 P C Tabe.eoaced 156 $84.95 M 150 connector for HTL. TTL 574.95 22/44 ,r pluoboam - S 2.95 ea, DTL, or CMOS Devices niection molded unit. Complete 22 tin double readout OT type (holes puce tth red hezel.41/1 x 4- x 1-9/15',. - OT T.59S 590 1250 8800V Un a sal M crocompulerlPrOaSsx, 519.95 ea. GC._._..- PROTO STRIPS m-59(11 bus strip piugbOarS -Epoxy Glass - complete . i. ..lih T.47S ro 1000 $3.95 ea.!i with beats,. and mounlniO hardware m39s JeJ1ng'I 'SD iketot .^.IIniIW3..'i'Yli i,;tili- '^ .RFEWfiI9liOT.Ies T-t7B bus stop 2.25 5 313 x 10 a 116 copper Clad 1.35S 350 9.50 - - ' 31-598 Itimp 1.358 bus slap 00 1/16 VECTOR BOARD 9MAIN..i;i1', RT-4)S gow 01.125 1.185 180 75 I.IpkEk1511yCpi6yVdh¡fiY_y¡ m -12s 120 .c.15 0 I Nine soaon9 P-Pane,n Prate 11da.1." . i'0147e OT -85 .1.25 PROBE Pan Ito l ed 1.9 10 up ,.! 07.85 JE803 0T-15 70 00 11 is for most PHENOLIC 54P44 062XUOP 450 6.50 1.72 1,54 61.355 The Loge Prole ,s a uml wnicn the pan 169P4., *Nib Experimentos 300 9.9.95 eespensebre n trouble logic ramies 0620007 4.50 17.00 3.69 3.32 Idy Or-75 snoolmg EPDXY 6aP440e2WE aso 6.50 207 1.86 -,-,r-^0TJ58 Experimentos 600 510.95 Ill OIL R1L CMOS N herioes the power it GLASS 841440620E 4.50 8.50 2.56 2.31 coeds ro operate threcllr oft of try brunt under 169P44 061WE 4 50 17 00 504 4.53 'eel drawing scant lomo ma. 1, uses a MANI 00.00 Minimum order - U.S. Fund, Only Spec Sheet, - 25e - Send Ose Stamp for 1978 Catalog 169P84 0620E 8 50 17.00 923 eadoul mmcale any of the loitoang states by 826 Calllomle Re,ldems - Add 6% Sale, Tax Dealer Information Ayellable , EPDXY GLASS 169P4a 062WEc1 4 50 1700 6 80 6.12 these svnWN Oil IILOWI' a ePUISS, P The COPPER CLAD 1978 Probe can oelectbop frequency pulses to 45 Mir, $9.95 Per Kit it can be used al MOO ievels or cncud damage - CATALOG result 63 KEY KEYBOARD $29.95 printed circuit board NOW - - - - . Ties keyboard 63 unen. James T'L 5V 1A Supply too ndm SPST keys un atraed lo AVAILABLE ELECTRONICS. This Is a standard co power suppI using me well known r e dr aim, o,Pcu A `r- 103095 x05010101 iC to plosOea saki 1 AMP°, current al moped pasht 13 ase 1021-A HOWARD AVE., SAN CARLOS, CA. 94070 volts we try to make Things easy lo, you or P1Sesding 1-_1Ie_ _ 9 suits most apontnpns _.i9aia_ ' eve,ymm0ycu need n one (gouge. including the na,°wa,e PHONE ORDERS WELCOME (415) 592.8097 165 ntoder chip (encodes 16 Keys - 101 67.95 a. Only Thru 85.5.2376 Encoder CITO (encodes (Wheys) 514.95 ea All Advertised Prices Good January $9.95 Per Kit CIRCLE NO. 24 ON FREE INFORMATION CARD JANUARY 1978 87 AmericanRadioHistory.Com Pushbutton TO OLD LABEL------PLANNING AFFIX here. ,e:.=-- AM AUTO RADIO print OLD address no label handy, In Or If you have !I !!® Mounts - -. 1099 Under -Dash please print I ` Volume & - AU -580 Tone 1 ti Address fal nin NiCad Rechargeable "AA" Cell Let us know 8 weeks in advance so that you city_ I PEN-LITE BATTERY _ Zip won't miss a single issue of POPULAR e ELECTRONICS. I State- _ // BA -341 1.2 Volt Attach old label where indicated and print Famous NEW ADDRESS HERE 0217 EA. new address in space provided. Also include J Manufacturer your mailing label whenever you write con- cerning your subscription. It helps us serve Name Volume Controls, Pkg. of 12 Assorted. VC -274 594 you promptly. please print Hardware 1 Lb. Assorted. HW-076. 504 to: P.O. Box 2774, Boulder, CO 80322 Address Apt Write Capacitors, Low Voltage Elect 50 Pc. CD -407 250 giving the following information: Terminal Strips, Solder Type, 40 Assorted. XM-501 69e Change address only Extend my subscription City Resistors, 100 Assorted Carton. RR-077 794 NEW SUBSCRIPTION ENTER State Zip 2" PM Speaker, 8-10 Ohm. 2 for 1.00. SS -295 794 Payment enclosed 1 year $12.00 Additional postage on foreign orders: add $3 a year for Canada, $5 Cassette Tape, Pkg. of 3-30 Minute. TA -879 794 (1 extra BONUS issue) its Allow 30-60 days for a year for all other countries outside the U.S. and possessions 8 -Track Tape, 40 Minute. TA -907 41 deliver. Bill me later Cash only on foreign orders, payable in U.S. currency. Earphones, 8 Ohm, Less Cord. Pkg. of 4 PH -405 494 Singer 12 Digit MOS Calculator Chip With Data. XM-635 1.79 UHF Varactor Tuner With Data Sheet XM-676 149 Ceramic Capacitors, Pkg. of 100. CC -211 100 RED LED, 2 Volt, l OmA. Pkg. of 5. PL -233 594 Seeking Original Japanese Replacement LCD 31 Digit Display. XM-371 2 79 709 High Gain OP AMP. RE -131 794 Slide Switches, 10 Assorted. SW -836 694 Parts for CB and Stereo Repair Use? Deluxe Stereo Headphones. PH -460 299 Famous Brand Stereo Receiver With Built -In 8 -Track Tape Player. RA -598 69.00 ,` V Ni Pack (2 "AA" Size Cells) BA -359 250 -Cad Battery Ni -Cad Battery Pack (3 "AA"Size Cells) BA -327 350 r_ Ni -Cad Battery 1.2 Volt at 1.5 Amp/Hr. BA -348 1 75 Ni -Cad Battery 1.2 Volt at2 Amp/Hr. BA -349 225 r A Mallory Duracell Photo Type PX-825. BA -323' 50 Cassette Laplel Mike, 3.5mm Plug. MM -174 1 00 Original Japanese Transistors, FET, IC,. Diodes 3" Recording Tape, Pkg. of 5 (125' to 300'). TA -928 1 00 Slidemount For Auto Stereo or CB. AU -149 199 . CHECK OUR LOW PRICES! r 6 to 12 Volt DC Converter, 6V. Acc. On 12V. Batt. AU -297 . 4 99 TRANSISTORS 2SA 816 .70 2SC 403 ,59 2SC 897 2.65 2SC 1449 1.00 2SD 358 1.30 650 RPM Motor, 51/2" Shaft,120V. AC. MO -265 1 00 2SA 818 1.40 2SC 430 1.10 2SC 898 4.40 2SC 1451 1.60 2SD 380 1.20 2SA 49 .59 9.6VDC Motor, 4 Step Shaft MO -365 100 25A 70 1.10 2SA 839 2.15 2SC 454 .59 2SC 900 .59 2SC 1475 1.40 2SD 382 1.40 25A 101 .59 2SA 841 .59 2SC 458 .59 2SC 929 .59 2SC 1478S .70 2SD 388 3.40 4000 RPM 117V. AC/DC Motor. MO -395 129 25A 102 .59 2SA 847 .59 2SC 460 .59 2SC 930 .59 2SC 1509 1.10 2SD 424 8.50 MO 159 2SA 234 .59 2SA 850 .70 2SC 461 .59 2SC 943 1.20 2SC 1584 8.50 2SD 427 2.80 18 RPM Geared Motor,120VAC. -409 481 945 .59 2SC 1586 6.60 23J 525 1.60 2SA 342 .90 2SA 872A .59 2SC 1.60 2SC TV Tuner Motor, 14 RPM, 129VAC. MO -392 159 2SA 353 .70 2SA 908 11.00 2SC 482 1.50 2SC 959 1.50 2SC 1624 1.30 2SD 526 1.10 2SA 377 2.00 2SB 54 .59 2SC 485 1.60 2SC 971 1.00 2SC 1826 1.10 2SD 555A 6.60 3" Fan and 120VAC Motor. MO -416 249 440 .90 2SB 55 1.10 2SC 486 1.60 2SC 983 1.00 2SC 1628 1.30 2SD 610 1.90 25A 31/2" Digit L -C Display. XM-371 3 75 25A 483 3.00 2SB 75 .59 2SC 495 1.00 2SC 984 .90 2SC 1647 .59 1.80 FET 484 2,50 288 77 .59 2SC 497 1.60 2SC 1000BL .59 2SC 1669 180VDC.XM-643 1 00 25A 2SK 19 1.60 Sperry 9 Digit Display, 485 2.00 2SB 188 .59 2SC 509 .90 2SC 1014 1.20 2SC 1674 .59 2SA 2SK 30 .90 69 2SA 489 1.60 2SB 187 .59 2SC 517 3.95 2SC 1017 1.40 2SC 1675 .59 RED LED, Pkg. of5.Pt-233 2SB 202 1.60 2SC 535 .70 2SC 1018 1.20 2SC 1678 2.25 2SK 33 1.10 2SA 495 .70 20 Key Calculator Keyboard. XM-339 1 50 2SB 220 .70 2SC 536 .59 2SC 1030C 2.80 2SC 1682 .45 2SK 34 1.10 25A 496 1.10 2SK 40 .70 2SA 197 1.60 2SB 303 .59 2SC 537 .59 2SC 1047 .70 2SC 1884 .59 TI Desk Calculator Keyboard. XM-523 1 00 324 .70 2SC 538A .70 2SC 1080 2.25 2SC 1708 .59 2SK 19 1.30 2SA 509 .70 2813 Pkg. of 4O. XM-501 100 288 337 1.60 2SC 562 2.15 2SC 1061 1.40 2SC 1728 2.00 2SK 55 1.30 Solder Type Terminal Strips, 2SA 525 2.50 2SK 88 1.30 2SA 537 2.25 2SB 367 1.50 2SC 563 1.10 2SC 1080 4.40 2SC 1730 .59 Knobs, Kit of 25. KN-030 694 3SK 22 2.55 Assorted 2SA 539 .70 2SB 3688 2.15 2SC 620 .59 2SC 1096 1.00 2SC 1760 2.00 3SK 35 2.25 Green. XM-341 1 39 2SA 561 ,59 2SB 379 1.10 2SC 632A .70 2SC 1111 3.40 2SC 1775 .45 .3" 7 Seg. L.E.D. Comm. Anode, 2SB 400 .59 2SC 644 .59 2SC 1115 3.40 2SC 1818 4.25 3SK 39 2.25 2SA 562 .59 3SK 40 2.25 .3" 7 Seg. L.E.D. Comm. Anode, Red. XM-370 1 39 .59 2813 405 .70 2SC 645 .70 2SC 1116 4.40 2SC 1885 .70 2SA 564A 3SK 41 2.50 1.10 2SB 407 1.40 2SC 650 1.30 2SC 1116* 4.90 2SC 1908 .59 .3" 7 Sed. L.E.D. Comm. Anode, yellow. XM-342 199 2SA 565 3SK 45 2.50 566 3.40 2SB 415 .70 2SC 688 .59 2SC 1124 1.30 2SC 1909 4.40 2SA MK 10 2.00 100 MFD. Elect Capacitor, 50 VDC. CC -216 994 28A 606 1.90 2813 434 1.20 2SC 680 2.80 2SC 1162 1.10 2SC 1951 1.10 2SA 624 1,10 2SB 440 .70 2SC 884 1.40 2SC 1166 .59 2SC 1957 1.20 IC 12K Ohm Globar Resistor. RS -241 594 2SA 627 3.60 2SB 483 1.50 2SC 6938 .59 2SC 1173 .90 2SC 1969 4.90 AN 2140 3.10 pf. 1 125V Pkg. of 5. CC -234 594 2SA 628 ,59 2SB 471 1.80 2SC 696 1.95 2SC 1175 .90 2SC 1973 1.10 AN 315 3.70 Mini Poly -Styrene Caps. 500 2813 472 2.80 2SC 708A 1.90 2SC 1177 11.00 2SC 1975 4.40 1 2SA 634 .90 BA 511 3.40 Mini Poly -Styrene Caps. 1000 pf. 125V Pkg. 5. CC -235 . 594 2SA 640 .59 2SB 474 1.20 2SC 710 .59 2SC 1189 1.40 2SC 2028 .90 BA 521 3.70 2SA 643 .70 2SB 492 1.00 2SC 711 .59 2SC 1211D .70 2SC 2029 3.90 HA 1151 3.70 12 Digit Calculator IC Chip, Data Incl. XM-330 149 .59 2SB 507 1.60 2SC 712 .59 2SC 1213 .70 2SC 2091 3.60 2SA 659 LA 4400 3.70 2" Waterproof Speaker, 8 Ohms. SP -471 1 49 2SA 663 4,90 2SB 509 1.90 2SC 717 .59 2SC 1222 .45 2SC 2092 3.90 TA 7045M 3.00 2SA 666 ,70 2SB 514 1.90 2SC 730 4.40 2SC 1226 1.00 2SC 2098 3.90 SN 7400 .19 80-40-20 MED 1 150V. Elect. Cap. CC -144 594 2SA 672 ,70 2SB 526C 1.30 2SC 732 .59 2SC 1237 4.25 2SD 28 2.80 SN 7490 .80 1150.50V Elect. Cap. CC -213 594 2SA 673 .70 258 527 1.90 2SC 733 .59 2SC 1239 3.50 2SD 75 1.10 TA 7055P 3.00 100-150 MFD 1.60 2SA 678 ,70 258 528D 1.60 2SC 734 .59 2SC 1279 .70 2SD 90 TA 7080P 1.60 3VDC Buzzer, 11/2" Diameter: XM-756 591 2SB 536 1.60 2SC 735 .59 2SC 1306 4.40 250 91 1.80 2SA 683 .70 TA 7061AP 1.90 994 2SA 604 .70 2SB 539 4.90 2SC 738 .59 2SC 1307 4.90 2SD 92 1.50 TA 7062 1.90 Wire Terminal Lug, 50 Pcs. Solderless. XM-735 2S0 1312 .59 2SD 118 3.00 2SA 695 .70 2SB 541 4.40 2SC 756 2.80 TA 7205P 3.90 100mA. Selenium Rect. 130VAC. RE -117 394 2SA 697 .70 2SB 554 10.00 2SC 763 .59 2SC 1313G .59 2SD 130 1.20 TA 7310P 3.95 2SA 706 1.60 2SB 5618 .70 2SC 773 .70 2SC 1317 .59 2SD 112 2.00 UPC 592/42 1.60 Output Transistor, 258474, to -66. TR-147 1 29 2SA 715 1.40 2SB 564 .90 2SC 774 1.60 2SC 1318 .59 2SD 143 2.80 PLL 02A 8.80 8 -Track Tape Deck Chassis, Includes Pre -Amp. 117VAC., lust 2SA 719 .70 208 595 1.90 2SC 775 1.95 2SC 1327 .59 2SD 178 1.40 DIODES 2SA 720 .70 2SB 600A 7.00 2SC 776 2.65 2SC 1330 1.50 2SD 180 2.50 Add Cables. RA -604 900 .70 2SC 183 .59 2SC 778 3.60 2SC 1342 .59 2SD 187 .59 1S 84 1.00 2SA 721 3 99 2SA 725 .59 2SC 184 .59 2SC 781 2.85 2SC 1344 .59 2SD 188 3.00 1S 188 .45 Telechron Digital Clock. 117VAC. SW-853 2SC 281 .59 783R 3.60 2SC 1345D .59 2SD 205 1.40 IS 332 .45 2SA 726 .59 2SC 20,000 MFD. 30VDC Capacitor, Computer Grade. CD -418 . 2.00 2SA 733 .59 2SC 281 1.40 2SC 784 .59 2SC 1359 1.40 2SD 217 4.40 1S 953 .45 2SA 740 2.65 2SC 387 .90 2SC 785 .70 2SC 1360 1.00 2SD 223 1.90 IS 1001 .45 600 MFD-360V. Photo Flash Capacitor. CD -475 901 2SA 744 3.70 2SC 369 .70 2SC 789 1.00 2SC 1362 .59 2SD 224 1.90 18 1209 .45 2SA 745R 4.40 2SC 371 .59 2SC 793 2.80 2SC 1364 1.40 2SD 227 .59 18 1211 .45 2SA 747 5.80 2SC 372 .59 2SC 799 3.80 2SC 1377 4.90 2SD 234 1.00 IS 1555 .32 2SA 750 .59 2SC 373 .59 2SC 915 .59 2SC 1383 .59 2SD 235 1.00 1S 1588 .32 electronics 2SA 756 3.40 2SC 374 .59 2SC 828 .59 2SC 1400 .59 2SD 287 3.70 IS 1885 .45 2SA 758 5.80 2SC 380 .59 2SC 829 .59 2SC 1402 3.70 2SD 313 1.10 18 2076 .45 260 S. Forge St. 2SA 774 .59 2SC 381 .59 2SC 838 .59 2SC 1403 3.70 2SD 315 1.20 1S 2093 .45 I-7 Akron, Ohio 44327 2SA 777 1.10 2SC 382 .59 2SC 839 .59 2SC 1419 1.10 2SD 325 1.10 1S 2473 .45 Dept. 2SA 798 .70 2SC 387 .59 2SC 870 .59 2SC 1444 2.80 2SD 356D 1.10 1N 34 .25 1.00 .25 2SA 814 1.90 2SC 394 .59 2SC 871 .59 2SC 1448 1.10 250 357D 1N 60 COD NAME PRICES MAY CHANGE WITHOUT NOTICE ORDERS WELCOMED ADDRESS FUJI-SVEA ENTERPRISE CITY STATE Z P IMMEDIATE. DELIVERY WITHIN '48 HOURS DIV. OF FUJI-SVEA INCORPORATED Ea. Total ON ALL TRANSISTORS IN STOCK Dept. Popular Electronics City. Stk. A Description Price add 4% sales tax.. Minimum order $5.00 Ohio residents P.O. Box 40325 Add $1.00 postage and handling. Quantity discount prices. ASK FOR OUR COMPLETE PRICE'LIST' Cincinnati, OH 45240 'MANUFACTURER INQUIRIES WELCOMED (513)874-0220 All Parts Guaranteed Against Factory Defects 874-0223 Postage S CIRCLE NO. 49 ON FREE INFORMATION CARD 88 CIRCLE NO. 15 ON FREE INFORMATION CARO AmericanRadioHistory.Com LOWEST PRICES ON PRIME TTL ICs BASED ON OUR ('LEDGE TO OFFER YOU TIIE LOWEST POSSIBLE I'll ICES ON PKI11E EVERT IC I'1 RCIIASED FROM US TO BE OF PRIME QUALITY VW WITH ORIGINAL m TT!, ICs, TIIIS \1ONTII WE II\VE REDUCED OUR \1.111(\DI' LOW PRICES. EVEN MANUFACTURER'S FULL 11.11IKING AND BRAND SYMBOL. NO RETESTS. I-I'RTIIER, ON 31\NY 1'15319. I IOWCOM K? WE JUST NEGOTIATED A \II I:I 1-91111105 FUNCTION Al. ON LYS, OR F'ALLOUIS AT ICC. IN ADDITION, OUR VOL! ME UNIT CONTRACT FOR OUR INTERNATIONAL. CUSTO21ERS AND ARE HAPPY TO DISCO! NT SCHEDULE ALLOWS YOU TO MIX ALL YOUR REQUIREMENTS FOR r PASS ON TIIE SWINGS TO YOU. AS ALWAYS, OF COURSE, WE CU SR \NTEE TIIAT EVEN GREATER SAVINGS. m 7470 27 74166 .... .95 74L509... .23 74LS139 .. .70 74LS386.. 36 745257 ... 1.15 74C161 ... 1.90 VOLUME DISCOUNT SCIIEDULE 7472 24 74167 ....3.20 74L510... .21 74L5151.. .65 74LS390 .. 1.65 74S258 ... 1.15 74C162 ... 1.90 7400 TTL Discount 7473 24 74170 .... 1.85 741511 ... .21 74L5152 .. .65 74LS393 .. 1.35 745280 ... 2.25 74C163 1.90 Merchandise Total NET n 0.00S 9.99 7400 ..S .14 7474 24 74173 .... 1.10 74LS12... .27 74LS153 .. .66 74LS490 .. 1.10 745287 ..-3.20 74C164 ... 2.95 S S 10005 2499 LESS 5% 7401 15 7475 45 74174 .... .85 74LS13... .40 74L5154 ..1.00 74LS670 .. 2.29 745289 ... 3.55 74C165 ... 2.95 5 25.00$ 99.99 LESS 10% 7402 15 7476 29 74175 .... .75 741514 ... .85 74L5155 .. .62 74S300 ... 1.60 74C173 ... 1.60 S 100005499 99 LESS 15% 7403 15 7480 31 74176 .... .69 741515... .26 74LS156.. .62 745305 ... 1.90 74C174 ... 1.95 74S00 TTL S 500005999.99 LESS 20% 16 74177 745310 74C175 1.95 7404 7482 50 ....,.70 74LS20... .23 74LS157 .. .62 ... 2.85 ... 5700000 and Up LESS 25% 7405 16 7483 54 74178 ....1.20 74LS21... .23 74LS158 .. .70 74500 . . . S .35 74S312 ... 1.05 74C192 ... 2.00 7406 ...... 24 7485 80 74179 ....1.20 741222... .23 )4L$160 .. .82 74S02 .... .35 74S313 ... 1.55 74C193 . 2.25 74C195 7407 24 7486 27 74180 .... .65 74LS26 ... .31 74L9161 .. .82 74S03 .... .35 745316 ... 2.80 ...2.25 STANDARD SHIPPING CHARGES 17 1 o 7408 7489 75 74181 ....1.75 741527... .26 7415162.. .82 74SO4 .... .36 74S341 ...4.10 74C200 ... 8.25 7409 17 7490 40 74182 .... .75 74LS30... .23 74L5163 .. .82 74S05 .... .36 74S342 ... 1.20 74C221 ... 2.00 If your merchandise total is between: 7410 15 7491 51 74184 ....1.75 74LS32 ... .30 74L5164 .. .98 74S10 .... .35 74S343 ... 4.95 74C931 ... .96 S 000$ 4.99 add 0200 7411 18 7492 40 74185 . 1.75 74LS37 . .31 74L5168 .. .83 74S11 .... .38 74S346 ... 1.25 74C902 ... .96 S 5.00524.99 add 51.00 add SO75 7412 20 7493 40 74188 ....2.80 74LS38 ... .31 74L5169 .. .83 74S15 . 28 745362... 2.15 74C903 ... .96 S 2800549.99 7413 25 7494 60 74190 .... .95 74L240... .26 74L$170.. 1.60 74S20 .... 35 740387 ... 4.70 74C904... .96 S 500059999 add 5050 NO 7414 55 7495 60 74191 .... .95 74LS42... .60 74L6173 ..1.00 74S22 .... .36 74C905 ... 6.60 $70000 and Up CHARGE 7416 22 7496 60 74192 .... .80 74LS47... .75 74LS174.. .75 74S30.... .27 74C906 ... .96 74C00 TTL The above charges include shipping P/I 7417 22 7497 245 74193 .... .80 74LS48... .72 74LS175 .. .79 74S32 .... .50 74C907 ... .96 First Class Mail or UPS (vol,, choice). 15 . 74C908 2.10 N 7420 74107 .29 74194 .80 74LS51... .25 74LS181..2.50 74540 .35 74C00 S .27 ...... and insurance on all domestic shipments 7421 17 74109 .32 74195.... .49 74LS54... .25 74LS190 .. .90 74551 .... .17 74CO2.... .27 74C909 ...3.95 7423 25 74121 .29 74196 .... .73 741555... .25 74L0191 .. .90 74S64 .... .38 74C04 .... .29 74C910 ... 6.60 7425 25 74122 .35 74197 .... .73 74LS73 ... .35 741S192 .. .90 74565 .... .38 74C914...1.90 SPECIAL SHIPPING CHARGES 7426 22 74123 .39 74198 .... 1.30 74LS74... .35 7415193 .. .90 74S74 .....18 74C10 .... .27 74C918 ... 2.20 7427 19 74125 .37 74199 1.30 .31 7415194 .85 74S112 .58 1.50 74C925 .... 741576...... 74C14 ...... 9.25 COD 51.00 -additional 7430 15 74126 .38 74251 ....1.00 74LS78... .36 7415195.. .50 74S113 ... .58 74C20 .... .27 74C926 ...9.25 Air Mail 51.00 -additional 7432 23 74132 .65 74279 .... .49 74L083 ... .75 7415196.. .80 74S114 . .58 74C30 .... .27 74C927 ... 9.25 Postal Insurance 57.00-additional 7437 21 74141 .70 74283 ....1.00 74L085 .. .1.30 74LS197 .. .80 74S132 ... .75 74C32 .... .35 74C928.. .9.25 Special Delivery 51.25 -additional 7438 21 74145 .65 74290.... .59 74LS86... .36 7415221 ..1.05 74S133 ... .38 74C42 .... 1.50 7439 25 74147 1.50 74293 .... .57 74LS90... .50 7415251.. .80 74S134 ... .38 74C48 .... 1.95 7440 15 74148 1.15 74298 .... .92 74LS92... .50 7410253 .. .80 745135 ... .49 74C73.... .75 !INTERNATIONAL P. 7441 70 74150 .79 74365 .... .62 74LS93 ... .50 7415257.. .70 745138 ... .77 74C74 .... .65 /OMPONENTS /OR 7442 38 74151 .59 74366 .... .62 74LS95 ... .85 7415258.. .70 745139 . . . 1.50 74C76 .... .95 7443 55 74152 .59 74367.... .62 74LS107 .. .35 74L0259 ..1.60 745140 ... .47 74C83 .... 1.50 1208 Bowling Street 7444 55 74153 .60 74368 .... .62 7415109 .. .35 74L5260.. .34 74S151 . . , 1.25 74C85 .... 1.20 7445 55 74154 .95 74LS112.. .35 7415266.. .26 74S153 ...2.10 74C86 .... 1.45 Columbia, MO 65201 (314) 874-1150 7446 62 74155 .65 74LS113 .. .35 74LS279.. .52 74S157 ... .75 74C89 .. ..3.95 TTL 7447 57 74156 .65 741$00 74L5114.. .35 74L5283. .72 74S158 ... 1.25 74C90 .... 1.10 7448 60 74157 .59 74LS00.. S .21 7415123.. .90 74L0290.. .60 745174 ... 1.50 74C93 .... 1.10 For prompt 24 -hour shipment of 7450 15 74160 .79 74LS01 ... .27 74LS125 .. .46 7415295.. .90 74S175 ... 1.45 74C95 , .. 1.30 your order, we are glad to accept Er 7451 15 74161 .79 741502... .21 74LS126 .. .46 7415298. .90 745189 74C107 ... .80 your Mastercharge or VISA 7453 15 74162 .79 74LS03 ... .21 74LS132 .. .72 7415365.. .52 74S194 . . . 1.75 74C151 ...2.75 7454 15 74163 .79 74LSO4 ... .24 74LS133 .. .34 74L3366 .. .52 745200 74C154 ... 2.70 IBankAmericard). COD orders are 7459 15 74164 .79 74LS05... .24 7415136.. .35 7412367.. .52 74S206 ...3.75 74C157 ... 2.00 also accepted for same day VISA' 7460 15 74165 .90 74LS08 ... .23 74LS138 .. .70 74LS368 .. .52 74S253 . . . .95 74C 160... 1.30 shipment. CIRCLE NO. 20 ON FREE INFORMATION CARD UNIVERSAL 4Kx8 MEMORY BOARD KIT PRINTED C.I.RCUIT.BUA'RD TRANSISTOR SPECIALS . FuhI'Wave Bridges 569.95 4 PRV 17 .61 ; SI'.,:LF SI".cOcsYls. MRF.8004 a CB RF Transistor 5 1.50 2A BA 254 32-7102,1 luny buttered, 16 address Imes. on BOARD I Is, . 100 1.30 ,., 753777 NP') S. TO 3 S 1.00 board decuding for any 4 of 64 pages, standard S 60 ea 5'52.60 251546 PN1' GE TO -3 5 .75 20 .75 1.25 2.00 44 pin buss. 1,50 7 WATT LD-65 LASER' DIO DE IR $&95 754908 PNP S. TO 3 S 100 4000 .95 3.00 256056 NP'. S TO 3 D.Pnnmon S 1 70 600 1.20 1.75 4.00 ' EXPANDABLE F8 CPU BOARD KIT 2N3820P'ET 5 45 265086 PNF S. TO92 4 S 100 76 5457 N FET S 45 SANKEN AUDIO POWER AMPS S99.00 754898 PNF TO 66 . S 60 5.1010G10 WATTS 5 795 K RS 1 262646 featurIng Fanbug P5U.1 of slap. ram. 232 5 45 25404 PNP 3E TO 5 5 5 1 00 ER 900 TRIGGER 4 SI 5, 1070 G 20 WATTS 515 95 1414114'P. dncumenlat,On, 64 BYTE leglsler DIODES 00 753919 NMI 5. TO 3 RF 0 I 50 26 6028 PROG WT 5 S. 1050 G 50 WATTS, . . 52795 65 .IPSA 13 NPN 5. TO 07 3 5 1 00 4K BASIC FOR FAIRBUG F8 MINIATURE "- LTI -U41. TRI" P7 TS 257767 NMI 5.TO66 5 70 - . TANTULU,M'CAPACITORS ." I' on paper tape .. 525 00 100. 500. I K.2K.5K,10K,25K 5CK 100K. 262227 NPN 5. TO 18 5 5 1 00 . 221E 35. 5 51 00 81SF 4 200K .500K 1 Meg 575 each 3 5200 2163055 NP7: S. TO 3 S .60 6 35V 51 00 47ÚF 263904 NPN S. TO 97 5 5 1.00 35V 5 SI 00 10ÚF 10V 5 .25 C/MOS (DIODE CLAMPED) x 100 :harge Couple) devote CCD202 100 763906 PNF S. T097 5 5 100 685SF 35V 551 00 22UF 25V S 40 74C10- .22 4012- .22 4023- 22 4046-2.25 Imago sensor . ..5145.00 IUF 35V 5 51 .... 265296 NON 5. TO 220 S 50 00 15UF 35V 3/51.00 74C193 -I.50 4013- .40 4024- .75 4049- .40 2 2 UF 2OV5 SI 00 30UF yE RIPAX PC BOARDAR 266103 PNP SI TO 220 S 55 6V 5/51.00 4001- .22 4015- .95 4025- .22 4050- .40 3 3UF 35V 4 SI 00 47ÚF S 763638 PNP S. TO 5 5 5 1 00 20V .35 Tna ,s . 1 16 4002- .22 4016- .40 4027- .40 hoa.d s' OAR pase, nonos 4.7UF 15V 4055-1.50 5/51.00 68 UF 15V S .50 4006-1.20 4017-1.05 4028 .88 4066_ SO 00...11. 4. 56. DRILLED and ETCHED g TTL IC SERIES 4007- .22 4018-1.00 4029-1.10 4071 .271 wh,ch .41 001.1 u0 11 21 sIngle 14 In IC's .65 7415 SERIES 4t 517s 6s LINEAR CIRCUITS " 4009-- .42 4019 .25 4030 .22 4076-1.05 o 8. 16. o, L51 DIP IC's w.th busses for 7400 .16 7445- .65 74151- .16 7446- 70 74153- .65 741.500 26 7415176 65 LM 101 75 pn.vel supply conncc'o,. . . 54 00 7401- 4010- .42 4020 1 05 4035- 1 10 74154-1.00 743502 26 74L5132 80 LM 301 748 79 Y 7401- .16 7447- .65 4011- .22 4022- .95 4042- .78 MV 5691 ELLOW GREEN 7403- .16 7448- .70 74155- .70 741503 - 26 7aL5136 39 LM307 - .30 BIPOI. AR LED S .90 7404- .20 7450- .15 74157- .65 741504 - 28 74L5139 72 CM 300 - 75 WSU-30 Hand wire wrap tool used FP 741505 28 74L5139 77 LM 311 75 100 P40TO'RA^.S . S 50 7405- .20 7477- .31 74161- .85 74L508 74L5151 - 120 to wrap, unwrap & strip U 30 woe 55.30 RED, YELLOW. GREEN or AMBER 7406- .25 7473- .32 74163- .80 28 90 LM 318 719.509 20 74LS153 93 LM 319 - 95 LARGE LED's .. 6/51.00 7407 25 7474- .32 74164- .95 824, EIGHT 7408- .20 7475- .45 74165-1.05 74L510 26 7415155 200 LM 324 -105 630 MIRE 1 L'5 IMCT-21 S 75 DIP SOCKETS 7409- .20 7476- .30 74170-2.25 4L511 - 26 741.5156 - 95 LM 339 -1 10 CONE1CTOF PIN - 22 24 PIN 40 WRAP WIRE MOLEX PINS '00/51.00 SPECTRA 8 7410- .16 7480 .45 74173-1.35 741513 - 50 7415157 98 LM 350 -1 40 14 PIN 25 28 PIN - 50 SINGLE 1000 58 00 .95 74L515 - 28 74L5160 02 LM 370 -I 15 ,FLAT FABLE STRAND 7411- .20 7483- .70 74174- lb PIN- 2840 PIN -.60 10 WATT ZENERS 3.9, 4.7, 5.6, 82, 7412- .20 7485- .57 74175- .90 741.520 - 26 7415101 02 LM 377 -2 50 10'151.50100751.40 7aL521 74L5162 26 300 , 100'453,50 18 PIN .30 12. 18.22,100,150 or 200V . ea. S .60 7413- .39 7486- .30 74176- .75 02 LM 741.572 26 74L5163 - -1 1 WATT ZENERS 4.7, 5.6.10, 12, 15 7414- .85 7490- .45 74177- .75 02 LM 391 25 2708 8K EPROM 1450 nsl 515.75 7416- .25 7491- .65 74180- .65 41.576 33 71.5168 - 10 LM 382 18 or 22V ...... ea.S .25 74L527 - 33 10 1 741.5169 537 50 7577 STATIC 51111 T RE6 S 95 MC6860 MODEM 7417- .25 7492- .43 74181-2.00 -2 1 CHIP 59.95 4,530 - 26 74L5170 - 72 553 2517 CHARACTER GEN S 6.75 7420- .16 7493- .45 74190-1.20 LM -250 .70 74191-1.20 1532 33 14L5173 - 39 17.4 555 39 7511 1160 .:7 PIT AR S 7425- .25 7494- 350 Silicon Power Rectifiers 74192- .83 74L537 .37 741.5174 - 05 LM556 05 4.95 7426- .25 7495- .65 TMS4050NL-4K dos RAM S PRV IA 3A 12A 50:4 1254 7427- .25 7496- .65 74193- .83 741530 - 37 7415175 22 10E540L -275 5203.2K EPROM S 4.50 .85 4L540 27 7415190 50 560 -2 00 100 06 14 30 80 3 70 7430- .16 74107- .28 74194- - nsl 5 1.19 7aL5412 88 7415191 565 - .95 27071 1024 87 RAM 1450 , 7432- .25 74121- .33 74195- 85 50 200 07 .20 35 1.15 4 75 74196- 74L547 79 7415192 566 2'.078. S 3.50 7437- .24 74122- .38 .86 19 -125 400 09 25 50 140 6.50 7438- .24 74123- .40 74279- .87 741551 26 74L5193 75 567 1.30 S 1.95 MK4008P ... 7440- .16 74125- .40 75491- .50 74L554 - 26 74L5195 25 703 - 90 RAM 600 11 30 70 1 80 8 50 578046 DYNAMIC S 4 75 7441- .70 74126- .40 741590 .95 74L5196 - 99 709 - 75 800 15 35 90 2 30 10 50 11014..256 BIT RAM S 75 7442- .52 74150 1.10 74L573 40 741.5197 - 99 710 35 1000 20 45 1.10 2 75 1250 741Cor V 31 MM5203 UV PROM 5 6 95 7/2 hr. TAPE AND" 741.574 40 741.5221 DIGITAL CASSETTES - 65 1702A UV PROM 5 4 95 SAD 1074 a RE DISCN 1024 stage analog "Becket 4L576 40 1415257 135 747 51.25 741.590 I CM 1310 2 50 5704.4K PROM S10 95 8'19ade 41111 register. 518.95 ERASABLE - 89 7415258 38 74L592 05 7415279 75 1456 95 E2523 .5 1.95 51 MM5387AA with FCS8024 readouts. This new Ns. I's 4148 ''49141 '5 00 74L593 - 85 7415365 - 66 1458 50 Ay 5 1013 DART 5 6.95 1 I I k i '1I dl ly d I LEO displays 1 7415109 43 741.5366 66 C/,3046 - 75 PTICAL ' l'.111' SI.ITC-" a Four .8 -high readouts su PPlied. 510.95 LIGHT ACTIVATED SCR's 7415112 43 74L5360 60 3900 49 J 90 REGULATORS 741_5113 43 14,5390 1 95 8038CC TO 18 2nn1 I A 5 1.70 MCM UMW, b lowe - I 657a4í.9 74L5114 43 U4791r5 195 309K S .95 340K5.12,15 case en re. yen .510.75 SILICON SOLAR CELLS 723 S .50 or 24V .... S 85 n dlan,oler .4V at 500 ma 54.00 LM 376 S .60 3407 5. 6, 8, 12 TRIACS 7' SCR'S - 320K 5 or1515v 51,40 78 or 2aV01'10 CTS 206-8 emus pos111on dm sw, ten .... 52.20 PRV IA 104 75A 1 5A 6A 35A 4 poso LED READOUTS 3207.5, 78 35 ' CTS -206 four non dip sw.tth .....51,75 100 40 70 130 40 50 1 20 FND359C.C. 4" S 50 DL -704..3" C.C. 5 95 or 24V 51.15 79 MG 51 35 es- I'E 200 70 1 10 1 75 60 70 ENO 70CC..4" 5 55 MAN7-.3" C.A. 5 95 ALCC' 5 I- VT TOGGLE SWITCHES 1.60 RS232 DB 25P male 52 95 END 503C.C..5" 5 855513-3 d'4. array 5 75 MTA 10. Pt T SI 20 400 110 160 260 1 00 1 20 7 20 CONNECTORS DB 25S Iemale . 53.50 VITA 70 END 510C.A. .5" S 85 D. 747 ^'A .6" ..91 296 DPOT .. Sl 600 1 70 2 30 3360 150 3 00 f - TMMI »: FOB Cambf dge, MUM. Send 25! for our catalog featuring SOLID STATE SALES WE SHIP OVER 95% Send Cheek M Money Order. Transistors and Rectifiers OF OUR ORDERS THE . Induda Pest MI m 145 P.O. BOX 744 Hampshire St., Cambridge, Mass. - DAY WE RECEIVE THEM Order $5.00, COD'S 820.00 SOM ERVI LLE,' MASS. 02143 TEL. (617) 547.4005 89 JANUARY 1978 CIRCLE NO. 45 ON FREE INFORMATION CARO AmericanRadioHistory.Com Your Home for Quality Kits, Projects and Components Toll -Free Wats Line -800-631-7485 Open Saturdays In New Jersey Call (201) 964-5206 WESTINGHOUSE TUBE Dual Range DIGITAL Voltmeter/ 1 SPECIAL MULTI -METER kit $29.95 DVM kit only BOXED AND BRANDED Oto+.2 Volts DC-Oto4-2 Volts DC Features latest Technology DVM 6GH8A $1.60 chip set 6LQ6/6JE6C 4.00 Non Critical Comp. 6DW4B/6CL3 High Noise Send for Free 2.00 Rejection Hobbi House Catalog 3A3C 2.50 Accuracy to within .001 969 BALL AVE., UNION, N.J. 07083 6HM5/6HA5 2.00 Contains - P.C. Boards; 4-large .50 6FQ7/6CG7 1.6C Fairchild Readouts; Display Drivers; 6LB6 4.00 Op -Amps; Inverter; all electronic lowest 6GF7A 2.50 comp. Switches, Pots; Complete In- prices 6BK4C/6EL4A 4.00 structions and Specs; & DVM Chip Set MA1003 8FQ7/8CG7 2.00 Requirements: Power Supply w/+5V, MOBILE CLOCK 6JS6C 4.00 +15V and -15V. MODULE (National) 12GN7A/12HG7 3.00 OPTIONS - Set/Precision Resistors ] 51895 complete 6GJ7/ECF801 2.00 for Increasing Voltage Range up to 200 Volts Attach_es directly to 9-12V Battery. 17JZ8 2.00 -$2.95 Automatic Nighttime Dimming. 5GH8A 2.50 Complete Multi -Meter Kit including Fluorescent Display gives Color J Power Supply -$49.95 Choice (Red, Blue, Green or Yellow) when used w/corresponding Color NEW KIT SPECIALS Filter. Includes - Module, Switches, Filter & Specs. MOTOR SPEED CONTROL / AUDIO AMPLIFIER $12 LIGHT DIMMER $8.99 Use as a portable P.A. system or INTRODUCING ALL NEW Adjust motor speed to suit -appli- remote listening device. Easy to cation or use as a light 3 -WAY AUTO SPEAKER dimmer assemble, battery operated (not control. A.C. operated. Case and included) and great fun. Case and STEREO SYSTEM assembly instructions included. assembly instructions included. CODE PRACTICE NEON RANDOM OSCILLATOR $10. BLINKER $7.95 Practice Morse code with this bat- Randomly flashes six neon tery operated (not included) com- lamps. A -C operated. Case and pact portable code generator. assembly instructions included. tip: % a loud tone. Case Emits pleasant TRANSISTOR & SE M I - and assembly instructions in- CO NDUCTOR TESTER $18.99 Two 6"x9" 20 ounce 3 -Way cluded. Use to check a wide range of bi- Speakers complete with ELECTRONIC DICE $15. polar transistors either in or out of chrome accents padded vinyl LED's arranged as dice. Each circuit. Designed for dynamic test- grills, mounting cables and press of the toss switch generates ing for both NPN and PNP types. hardware, Only $49.95 a random roll of the dice. Oper- Attractive case and assembly in- ates on 9 volt battery (not in- structions included. 3 -WAY Concert Hall Sound cluded). Case and assembly in- TRANSISTOR Woofer - Heavy duty 6"x9" high structions included. CURVE TRACER $49.95 compliance woofer, with foam rolled ELECTRONIC COIN TOSS / Adapts to your scope to form a edge, delivers full bass ranges. Air DECISION MAKER $9.95 suspension allows free cone re- transistor tester that generates a Generates a statistically random family of characteristic curves to sponse. "coin toss" for those difficult TWEETER 2" deci- give you semi -conductor informa- - Mylar cone sions requiring an unbiased supertweeter provides ultimate in tion not otherwise obtainable high frequency reproduction. guess. Great fun testing your ESP (beta, leakage current, forward MID -RANGE - Powerful 3" deluxe too. Battery operated (not in- resistance, etc.). Will test both mid -range adds dimension to be- cluded). Case and assembly in- signal and power devices. Case tween frequency response for en- structions included. and assembly instructions in- hanced clarity in mid -range sound. T.V. SCRAMBLER $12.99 cluded. Use to remotely blank out T.V. set SIGNAL INJECTOR $10. $99.95 AM/FM Casette Stereo $99.95 during commercials or while Useful for checking and trouble- WITH ENCLOSED SPEAKERS answering phone. Can also be shooting amplifiers, radios, Complete with all mounting hardware used as a high frequency oscil- stereos, etc. Generates a 1-kHZ NOT A KIT lator. Battery operated (not in- tone with harmonics to 250 MHZ. cluded). Case and assembly in- Battery operated. Case and as- 12VDC Regulated CB Power Supply structions included. Converts 120VAC to Regulated 12VDC sembly instructions included. F -M TRANSMITTER. $13.99 Use Car CB or Stereo at Home Portable F -M Terms and Conditions Complete NOT A KIT -$18.95 battery operated - transmitter enables you to broad- Orders Shipped Within 24 Hours TRANSFORMER 6.3 volts at 1.2 amps $5.00 Minimum Order, - $1.49 cast over your F -M radio. Use as a Telephone 0.O.D.'s accepted. DIFFUSED LEDs JUMBO RED LEDS portable microphone or in-house $15.00 Minimum Bank Americard/ 7/$1.00 0.2", and Factory Prime 100/$11.00 paging system MasterCharge order. Add 51.00 Postage for orders DL 741 Jumbo 7 TTL POWER SUPPLY. $11.95 under Segment Displays $10.00. 5 volt, 600ma., Common Annode -$1.35 regulated power Outside Continental U.S. add postage - Sound Actuated Switch $.85 supply. Use to power all your TTL U.S. Funds. - projects. Case and assembly in- N.J. Residents add 5% Sales Tax. . - 6 FT LINE CORDS - 6 for $1.00 structions included. Money Back Guarantee. CIRCLE NO. 18 ON FREE INFORMATION CARD 90 POPULAR ELECTRONICS AmericanRadioHistory.Com MICROCOMPUTER 8K STATIC RAM BOARD ASSEMBLED & TESTED MICRO PROCESSOR'S PROM'S 8080A SUPPORT DEVICES F-8 19.95 1702A 5.00 8212 3.95 Z-80 25.00 2704 15.00 8214 9.95 2708 250ns. 199:95: Z -80A 35.00 20.00 8216 4.50 CDP1802CD 24.95 2716 38.00 8224 4.95 AM2901 22.95 3601 4.50 8228 8.75 5203AQ 4.00 350ns. $189.95 6502 12.95 8238 8.00 6800 19.95 5204AQ 6.00 8251 12.00 8008-1 8.75 6834 16.95 8253 28.00 6834-1 14.95 4 5Ons. $169.95 8080A 15.95 8255 12.00 825236 TMS-9900TL 89.95 4.00 8257 25.00 * WILL WORK WITH NO FRONT PANEL 8251296 4.25 8259 25.00 8223B 2.70 * FULL DOCUMENTATION 6800 SUPPORT * FULLY BUFFERED 6810P 4.95 STATIC RAMS 1-24 25-99 100 S100 DESIGN 6820P 8.00 * 6828P 11.25 21L02 (450) 1.50 1.40 1.25 * ADEQUATELY BYPASSED 21 L02 1.95 1.80 1.50 6834P 16.95 (250) * LOW POWER SCHOTTKY SUPPORT IC'S 6850P 9.95 21 L11 4.25 4.10 3.95 6852P 11.95 1101A 1.49 1.29 1.10 6860P 14.95 2101-1 2.95 2.75 2.60 6862P 17.95 2102 1.25 1.15 1.00 KIT 6880P 2.70 2102-1 1.50 1.30 1.15 2111-1 4.00 3.50 3.25 2112.1 3.00 2.80 2.69 280 SUPPORT DEVICES 2114 17.95 16.95 16.50 250ns. $169.95 3881 12.95 31101 2.50 2.35 2.00 3882 12.95 3107 3.95 3.70 3.25 4200A 12.95 12.50 11.95 350ns. $139.95 17.95 F-8 SUPPORT DEVICES 4804/2114 16.95 16.50 5101C -E 11.95 11.25 10.25 3851 14.95 74C89 3.25 3.05 2.85 450ns. $129.95 ' 3853 14.95 74S201 4.50 4.30 4.25 i 7489 2.25 2.10 1.90 DYNAMIC RAMS 8599 1.88 1.75 1.60 9102BPC 1.65 1.45 1.30 1103 1.50 IMSAI/ALTAIR S-100 COMPATIBLE 2104 4.50 2107A 3.75 KEYBOARD CHIPS KIM 2107B 4.50 AY5-2376 13.95 KIM -1 245.00 21078-4 4.00 AY5-3600 13.95 6502 12.95 TMS4050 4.50 6520 9.00 TM 54060 4.50 UART'S 6522 9.25 4096 4.50 JADE 6530-002 15.95 4116 42.00 AY5-1013A 5.50 Z80 MM5270 AY5-1014A 8.95 6530-003 15.95 5.00 15.95 MM5280 TR-1602A 5.50 6530-004 6.00 6530-005 15.95 KIT MCM6605 6.00 TMS-601 1 6.95 IM -6402 10.80 -with PROVISIONS for I M-6403 10.80 USRT CHARACTER S-2350 10.95 ONBOARD 2708 and POWER ON JUMP GENERATORS FLOPPY DISC CONTROLLER WD1671B 29.95 2513 UP 6.75 1771B 55.95 2513 DOWN 6.75 1771B-01 59.95 WAVEFORM GENERATOR UP (2MHZ) 2513 (5v) 9.95 8038 4.00 $135.00 EA. 2513 DOWN15v) 10.95 SHIFT REGISTERS STATIC MC4024 2.50 MCM6571 10.80 566 1.75 MCM6571 A 10.80 2518B 3.95 MCM6572 10.80 2533V 2.00 (4MHZ) MCM6574 14.75 TMS3002 1.00 $149.95 EA. MCM6575 14.75 TMS3112 3.95 MM 5058 2.00 MISC. OTHER COMPONENTS BARE BOARD $35.00 NH0025CN 1.70 P -3408A 5.00 NH0026CN 2.50 P-4201 4.95 TV N8T20 3.50 MM -5320 7.50 N8T26 2.45 MM -5369 1.90 Game Chip 74367 .90 DM -8130 2.90 TMS1955NL IMSAI/ALTAIR COMPATIBLE DM8098 .90 DM8131 2.75 S-100 1488 1.95 DM -8831 2.50 1489 1.95 DM -8833 2.50 Now Only D -3207A 2.00 DM -8835 2.50 C-3404 3.95 SN74LS367 .90 $10.95 SN74LS368 .90 JADE 8080A KIT - WITH EIGHT LEVEL VECTOR INTERRUPT PerSci DISK AND CONTROLLER Use the PerSci Disk and Controller now with the Info 2000 Adapter for the S-100 Bus. $110.00 KIT INFO 2000 "SPECIAL" (includes Model 277 Dual Drive, Model 1070 BARE BOARD $35.00 Controller, Case with power supply and fan, and cable) $2,150 Model 277 Dual Diskette Drive $1,130 SASE Model 1070 Controller $740 Computer Products Slimline case with power supply and fan 5351 WEST 144th STREET $280 LAWNDALE, CALIFORNIA 90260 Adapter for the S-100 Bus (Kit) $120 (213) 679.3313 RETAIL STORE HOURS M -F 9-7 SAT. 9-5 JADE PARALLEL/SERIAL JADE Discounts available at OEM quantities. Add $1.25 INTERFACE KIT VIDEO INTERFACE KIT for shipping. California residents add 6% sales tax. $124.95 KIT $89.95 KIT CATALOG FREE WITH $10.00 ORDER . CIRCLE NO. 22 ON FREE INFORMATION CARD JANUARY 1978 91 AmericanRadioHistory.Com rj Money back guarantee. NO COD'S. Texas residents add 5% sales tax. Add 5% of order for (All prices subject to'Change Radler postage and handling. Orders under $15.00 add 75 cents. Foreign orders add 20% for postage. without prior notice.) For your convenience, call your Bank Americard or Master Charge orders in on our Toll Free P.O. Box 38323P P Halt Watts Line: 1-800-527-2304. Texas residents call collect: 1-214-271-8423. Dallas, Texas 75238 POWER SUPPLY VARIABLE This model will power a 5 wall Iren- 60 Hz. Crystal Time Base UNSCRAMBLER KIT NO. 1 ONLY sistorized CB Radio for Digital Clocks Continuously variable from 5V to $10.95 20V $19.95 Excellent regulation up to 'h Amp $4.50 Kit includes all components Drilled fiberglass P.C. Board LOOK AT THIS SPECIAL Buy 2 for $8. Case Included A. 60 Hz. output with accuracy comparable to a digital 4400 MId of filtering FROM RADIO HUT watch. One hour assembly B. Dlreolly Interfaces with all MOS clock chips. Plugs Into earphone or external Power Supply amp Kitt 501 reg. C. Super low power consumption ma type.) speaker of any Scanner or Monitor. Line regulation .005% (1.5 VARIABLE POWER SUPPLY D. Uses latest MOO 17 stage divider IC. Guaranleed to unscramble any Lead reguletion 50mV 1085 NO. 2 E. Eliminates forever tee problem of AC line glitches. call. KIT Kit includes components, Pc board, F. Perfect for cars, boats, campers, or even for portable Easily tuned transformer. fuse and pilot light. Line at ham Same es above but with a 1 Amp out- clocks field days. Full Instruction Included not put, also with case cord included. G. Small size, can be used to existing enclosures. Drilled fiberglass P.C. Board ONLY 513.95 KIT INCLUDES CRYSTAL. DIVIDER IC, P.C. BOARD One Hour Assembly Only $6.50 PLUS ALL NECESSARY PARTS 8, SPECS. Punched Cese MA 1003 CAR CLOCK FROM NATIONAL $ 17.95 ALSO, THIS MONTH ONLY, INCLUDES SPECS. ÁND 3 SWITCHES. FREE EDGE CONNECTOR. ° ° ry 7400 TTL DIGITAL CIRCUITS ITT HIGH' LEVEL LOGIC . , HOUSE #TTL ,IC's CRYSTALS 7400 7430 ,11 .13 7480 .31 74153 .61 301 Dual 5lnpDut NAND Gate .15 7400 1011.00 7a01 .13 7432 7481 .55 74154 .98 please specify 7437 6/1.00 300 KHz 51,50 .23 302 Quad 2 Input Buffer open collector .18 7404 1011.00 7438 611,60 7402 .13 7433 7482 74155 , 3.57945 1.25 .26 .57 .89 303 Quad 2 Input NAND Buffer .15 7408 10/1.00 hat ypu 74141 3/1.00 7403 .13 7437 .23 7483 .67 74156 .89 311 Master Slave F/F .18 7420 1011.00 are ordering 74153 3/1.00 7404 .15 7438 .23 7485 .89 74157 .55 312 Dual JK Flip Flop .18 74104 House Number TTL, .29 7440 .13 7489 1.25 74160 .55 321 Quad 2 input NAND Gate .18 74504 .44 7441 .76 7490 .65 74161 .65 322 Dual5 Input NAND Gate .15 7405 .13 7442 .47 7491 .61 74163 .65 323 Quad2lepu1NANDGale .18 COUNTER AND 3406 .16 CLOCK CHIPS 7447 .59 7492 .43 74164 .85 324 Quad 2 Input NAND Gate .18 7407 .16 7444 MK50252 .59 7493 .43 74165 .89 325 Dual 2 Dual 3 Inpüf NAND Gate .13 Clock Chip 54.99 7408 .68 7494 .67 74174 .85 326 DualDuaal 3 input NAND .13 MM525316 Clock Chip 3.75 C\PL'' 7409 .19 74419 7 .68 7495 .67 74175 .85 SlInput Expander 19.13 Alarm 7410 .13 7448 .71 7496 MK50380 .67 74180 .67 332 Hex Inverter .18 Alarm C DMK50250k 2.9552.6,711.,0,,,s1.-KES 7411 .18 7450 .13 74100 .30 74181 FCM7010 1 1.93 333 Hex Inverter .18 Direct Drive Clock Chip4.95 .26 7451 MK5005 4 .13 74104 .49 74182 .68 334 Hex Inverter .18 Digit Counter w/Latch 8.503 pC 7413 .3710 7453 .13 74107 MK5002 4 P\) .26 74191 ,79 335 Hex Inverter .18 Digit Counter 8.95 E14 cYs' 7416 .15 7454 .13 74109 MK50395 6 .31 74192 79 342 Dual One Shot Multivlbralor .25 Digit UP/Down Counter 12.95 1141'Z:4'0-- 7412OCKE¿507420 .13 7460 .19 74121 .29 74193 .81 MK50397 6 Digit Elapsed Timer 8.95 343 Dual 4 011 Comparator .22 7421 .13 7470 .27 74123 .48 075005 74194 .81 370 Quad D Flip Flop .22 Calculator Chip w/Specs 1.25 7423 .25 7472 .25 74132 MK5021 Cal. w/sg. rl. .99 74195 .69 371 Decode Counter ,30 Chip 2.50 7425 .29 7473 74136 .29 .99 9316 .85 372 Quad Ripple Counter 39 7426 .24 7474 .29 745138 1.95 9601 3151 380 BCE to Decimal Decoder .39 7427 .19 7475 .47 74141 .75 9104 .35 SOCKETS ,' TRANSISTORS 381 BCD to Decimal Decoder .39 - 7428 .26 7476 .31 74151 .61 8 PIn Low Prollle .20 4'ft MOS TO LED DRIVERS 14 Pin Low Profile .22 INTERSIL DUAL TRANSISTORS LOW POWER 16 Pin Low Profile .25 Originally Cost 53. each 74100 SCHOTTKY° Pin .30 TT 501 Quad Seg. Dr. .35 100's ° 18 Low Profile Similar to 2N913 TT 502 Hex Digit Dr. .49 nave o1 28 Pin Low Profile .69 .21 741547 .73 7415136 Ousands 2 Per Peck 74Lí00 .37 4Lí258 .71 TT 503 Quad Seg. Dr. .49 `Ne 40 Pin Low profile .89 2/51 74L 551 .26 7415138 .71 415260 tb patty. 74Lí02 .21 .26 TT 506 Hex Digit Dr. .49 0f 741503' .21 741554 .26 7415139 .71 7415266 .26 TT 5088 Digit Dr. ,49 \`51e ar 741íO4 .28 741555 74LS145 1.00 7415279 ,te .26 .55 TT 509 8 Seg. Dr. .49 these pa GENERAL 741505 74Lí73 7415151 .70 74Lí290 ee PURPOSE POWER IRAN. .35 .75 TT 511 Quad Seg. Dr. .55 t00ó pr .2128 PNP 741508 741574 .35 7415153 .70 74L5293 .6115 2N 2905 4/51 115 W 200V NPN .95 IT5148 Digit Dr. .r59 741509 .28 741.576 .49 70155 .69 7415295 .95 2N 3904 NPN 8151 TIP29 (EP967) NPN 4/51 741510 .21 74L583 .73 7415156 .70 7415298 .95 2N 3906 PNP 8151 TIP 30 (EP929) PNP 4/51 741511 .21 741585 1.35 7415365 2N 3392 Pre -Amp 25/51 TIP 31 P.C. Leads 7415157 .75 .55 . TTL SPECIAL! - NPN 5/51 741513 .45 74L586 .36 7415158 .71 7415366 .55 2N 4400 NPN 10151 MJE 2370 3151 741314 .99 74Lí90 .55 7415160 .85 7415367 .55 9002/7400 10/1.00 - - 2N 4802 PNP 10/51 2N 3055 .75 741515 .26 741592 .55 7415161 .85 74Lí368 55 900317410 parts EN 2222 NPN. 8151 TN 2021 By RCA .95 10/1.00 e 741520 .24 74Lí93 .55 7415162 .85 7415390 1.75 9004/7420 10/1.00 900Te EN 2907 PNP 8/51 FETTIS75 HOUSE 1rpr\as,n 1 5/51 , 741521, .28 7415109 .38 7415163 .85 7415393 1.45 900617460 6/1.00 7415221 .28 74Lí112 .38 7415164 1.49 7415670 2.30 9007/7430 10/1.00 741526 .32 74Lí113 .38 74Lí168 9009/7440 Pin p1 CAPACITORS .85 7415192 .95 10/1.00 P1vR 1` .. 741527 .32 7415114 .38 7415169 .85 7415193 9016/7404 be .95 8/1.00 at t+ l ELECTROLYTIC 741330 .26 74Lí122 .49 7415170 1.69 7415194 .95 9024/74109 3/1.00 W set\es. .32 7a00 741532 7415124 .99 7415173 1.10 7415195 .85 9300174195 3/1.00 AXIAL TYPE RADIAL TYPE 741537 .32 7415125 .47 74Lí174 1.00 7415196 .85 20 MFD 250V 5151 47 MFD 35V PC Leadst0l51 741538 32 7415126 .47 74Lí175 .81 7415197 .85 35 MFD 25V 15151 68 MFD 25V PC Leads 8/51 741540 .26 7415132 .79 7415190 .95 7415251 .85 200 MFD 25V 5151 330 MFD 50V PC Leads 5151 74L542 .65 74LS133 .35 7415191 .95 ' 7415253 .81 'S . °D.TL' 470 MFD 35V 4151 470 MFD 16V 4/St - .. 7415257 .71 470 MFD 16V 4/St 1000 MFD 35V PC Leads 4/51 500 MFD 35V 5151 932 Dual 4 Input Buffer 8151 2000 MFD 16V 74H.SERIES TTL 934 Dual5 Input NAND Gate 10151 3/51 150 PFD MICA 5% 10/51 941 One Shot Mulllvlbrator 5151 945 JK FIF 8/S1 COMPUTER GRADE 74H00 .18 74H21 .29 74H53 .29 74H73 .39 946 Quad 11 Input Gate NAND/ NOR 8151 1,9C0 MFD 35WVDC(Mini) 3/S2 68PFd 50V 680PFd 50V 74H0í .29 74H40 .29 74H61 .25 74H74 .39 948 JK F/F 815t 8.000 MFD 15WVDC 95 cents each 100 PFd 100V .001 Fd 74H20 .29 74H50 .20 74H72 .45 950 FIF 10151 33.000 MFD 40WVDC 54.00 Each 150 PFd 50V .002 MFd 50V 951 One Shot Multivibratvr 5/51 220 PFd 50V .01 MFd 200V 1800 (see 934 above) 10/51 330PFd 50V .02 MFd 200V CMOS 1806 Quad 2 Input NAND Gate 10/51 .001 UFd500V 3.3 PF 500V 9093 Dual JK F/F 8151 TANTALUM .0015 UFd500V 4,7 PF 500V 9094 Dual JK F/F 8/51 1 MFD20 WVOCPC Leads 15/51 .005 UFd500V 8.2 PF 500V C(340000 .19 CD4G17 .95 CD4040 1.00 CD4071 .19 9097 Dual JK F/F 8/51 3.3 MFD35 WVDC PC Leads 8151 100PF 500V CD4001 19 CD4018 .95 CD4041 .69 CD4081 .19 9099 DuolJK F/F 8/51 4.7 MFD10 WVDC PC Leads 5151 CD4002 .19 CD4019 .19 CD4042 .69 CD4507 .35 9109 Hex Inverter 7151 10 MFD20 WVDC PC Leads 8/51 PC Leads 25/89 cents No Mix CD4066 I.20 CD4020 .97 CD4043 660 C04508 2.80 9110 Hex Inverter 7(01 31MFD10WVDC 6151 CC/400707 .19 CD4021 .97 CD4044 CD4510 1.00 9112 Hex Inverter 7/51 22 UF10 10/S1 Long Leads 25/89 cents No Mix,, CD4009 .47 CD4022 .97 CD4046 1.39 CD4512 1.10 9601 One Shot 3/51 CD4010 .39 CD4023 .19 CD4047 1.50 C04516 .79 9930 Dual 4 Input Ext. NAND 8151 C13401111 .19 .75 .35 CD4024 6D4049 CD4518 1.10 9932 Quad 2 Input NAND Buffer 8/51 . -. RTL's BY FAIRCHILD - CD4012 .29 CD4025 .19 CD4050 .39 604520 .69 9945 RS F/F 8151 .32 CD4013 CD4027 .39 CD4051 1.19 CD4528 .85 9946 Quad 2 Input NAND 8151 The most popular digital IC's ever .78 CD40t4 CD4028 .85 CD4053 1.19 74CO2 .45 9949 Quad 2 input NAND 8/51 produced. Very hard re find! CD40t5 .78 CD4029 .99 CD4056 1.15 74604 .32 9951 Monostable Multivlbrator B/St UL DUAL 2INPUT NOR .99 CD40t6 .32 CD4030 .35 CD4066 .78 746107 .79 9962 Triple 3 Input NAND 8151 UL923 JK FLIP FLOP 51.19 ..VOLTAGE REGULATORS 7805 Pos. 5V 1 Amp .99 7818 Pos. 1BV 1 Amp .99 723 VOLTAGE REGULATORS MOTOROLA VOLTAGE REGULATOR 7806 Pos. 6V 1 Amp .99 7824 Pos. 24V 1 Amp .99 Output voltages variable from 2 volts to 37 volts. MC1469R. TO -66. 91ead package for 3 to 30V out- 7808 Pos. 8V 1 Amp .99 7905 Neg. SV 1 Amp 1.10 A very versatile and popular device. -14 PIN DIP. puts. Provides 600 MA direct output or more by 7812 Pos. 12V 1 Amp .99 7912 Neg. 12V 1 Amp 1.10 69c using an external power transistor. Regular cata- 7815 Pos. 15V 1 Amp .99 7915 Neg. 15V 1 Amp 1.10 log price - 54.00 each! With specs. 51.95 each BRIDGE RECTIFIERS DIODES 1 N 1 Amp 200V 6151 IN 4002 1 Amp 100 PIV 40/51 ZENER DIODES HOUSE e ZENER SWITCHING DIODES 1 Amp 5.90 50V IN 40041 Amp 400V 15151 IN 746 3.3V 400M4/51 4.7 V 500 MW 10/51 IN 4148IIN914 Long Leads20151 6 Amp 50V 1.10 IN 4007 1 Amp 1000 V 10151 IN 752 5.6V400M4/51 9. V 500 MW 10/51 IN 4148/IN9t4 Cut Leads 40/51 10 Amp 500 1.25 IN 1958 8.2 V 403M 4/51 10V 1 Watt 8/S1 IN 4148/IN914 PC Leads 100151 25 Amp 50V 1.39 GERMANIUM DIODES 1N5259 39V 50053 10/51 15 V 500 MW 10151 IN 54A 8/51 IN 5271 100 V 500M10/51 22V 5Watt 6/51 IN 270 10/51 IN 5280 180V 500M10151 LINEARS 709 Operational Amplifier ° .25 LM 308 Operational Amplitler .95 LM 377 Dual 2W Amplifier 1.85 NE 567 Tone Decoder 1.25 710 Differential Comparators .40 LM 309K 5V Lamp Regulator 1.49 LM 3900 Quad Op-Amplitler .40 1458 Dual Op -Amplifier .55 711 Dual Differential Comp. .35 LM 710 Voltage Comparator .25 LM 741 Operational Amplifier .25 75491 Quad Segment Driver .35 712 Hall Adder .25 LM 311 Voltage Comparator .85 LM 748 Operational Amplifier .25 75492 Hex Digit Driver .35 749 Stereo Pre -Amp by Fairchild 2151 LM 318 Operational Amplifier 1.15 NE 553 Quad Time, 1.95 3043 IF Amplifier .75 LM 301 Operational Amplifier .30 LM 723 Voltage Comparator .69 NE S55 Trmer .40 8038 Voltage Cont. Osc. 3.95 LM 307 Operational Amplitler .30 LM 324 Quad Operational Amplifier NE 556 Dual Time, 95 RADIO HUT 1-800-527-2304 VISA P. 0. Box 38323 Dallas, Texas 75238 Use Our Toll Free Watts Line For Master Charge and BankAmericard Orders CIRCLE NO. 39 ON FREE INFORMATION CARD AmericanRadioHistory.Com S. D. SALES CO. AN EMPIRE IND. CO. VISA D P.O. BOX 28810 DALLAS, TEXAS 75228 Fri ORDER BY PHONE CALL TOLL FREE 1-800-527-3460 S.D. SALES NEW EXPANDO RAM KIT 8K FOR $151.00 EXPANDABLE EPROM BOARD INTERFACE CAPABILITY 16K or 32K EPROM $49.95 w/out EPROM Control. data and address in- 32K FOR $475.00 puts utilizes low power Allows you to use either 2708's for 16K of Schottky devices. MEMORY CAPACITY 0,- 041 Epram or 2716's for 32K of Eprom. MEMORY ADDRESSING POWER REQUIREMENTS MEMORY WRITE + 8VDC 400MA DC KIT FEATURES: PROTECTION + 18VDC 400MA DC 4040-11,e 30MA DC 8K, 16K, 24K, 32K using Mos- -18VDC 1. All address lines & data lines buffered. tek MK4115 with 8K bound- on board regulation is provid- 2. Quality plated through P.C. Board, in- aries and protection. Utilizes ed. On board (invisible)refresh DIP switches. PC board comes is provided with no wait states cluding solder mask and silk screen. with sockets for 32K operation. or cycle stealing required. Orders now being accepted. MEMORY ACCESS TIME 3. Selectable wait states. Allow 6 to 8 weeks for delivery. IS 375ns. Memory Cycle Tame is 500ns. 4. On board regulation provided. Buy an S100 compatible 8K Ram Board and upgrade the same board to a maximum of 5. All sockets provided w/ board. 32K in steps of 8K at your option by merely purchasing more ram chips from S.D. Sales! At a guaranteed price - Look at the features we have built into the board. WE CAN SUPPLY 450ns 2708's AT $11.95 PRICES START AT $151. FOR 8K RAM KIT WHEN PURCHASED WITH BOARD. Add $108.00 for each additional 8K Ram Z-80 CPU BOARD KIT - $139. 8K LOW POWER RAM - $159.95 4K LOW POWER RAM KIT CHECK THE ADVANCED FEATURES OF OUR Z-80 Fully assembled and tested. Fully Buffered on board regulated CPU BOARD: rxpanded set of 158 instructions, 6080A Not a kit. - - Imsai - Altair reduced power consumption utilizing 'software capability, operation from a single 5VDC power S-100 Buss compatible, uses low power 21L02 - 1 500ns RAMS - supply; always stops on an M1 state, true sync generated low power 21 static L02-50ons Sockets provided for all IC's. Quality on card (a real plus featurel), dynamic refresh and NMI fully on board buffered regulat- plated through PC board. 'Add $10. for available. either 2MHZ or 4MHZ operation, quality double ed, quality plated through PC 250ns RAM operation. sided plated through PC board; parts plus sockets priced board, including solder mask. 8 for all IC's. 'Add $10 extra for Z -80A chip which allows pos. dip switches for address 4MHZ operation. Z-80 chip with Manual - $39.95 select. The Whole Works - $79.95 MUSICAL HORN Jumbo LED Car Clock Kit DIGITAL LED READOUT One tune supplied with each kit. Additional tunes - $6.95 FEATURES: THERMOMETER $29.95 each. Special tunes available. Standard tunes now available: - A. Bowmar Jumbo .5 Inch LED array. - Dixie - Eyes of Texas - On Wisconsin - Yankee Doodle B. MOSTEK - 50250 - Super clock chip. Dandy Notre Dame Pink Panther Aggie War Song - - - - C. On board precisior crystal time base. Features: Litronix dual 112" displays. Anchors Away Never on Sunday Yellow Rose of Texas D. 12 or 24 hour Real Time format. - - - Uses Silicoaix LD131 single chip CMOS Deep in the Heart of Texas Boomer Sooner Bridge over - - E. Perfect for cars, boats, vans, etc. neces- River Kwai. AID converter. Kit includes all F. PC board and all parts (less case) inc. sary parts (except case); AC line cord CAR & BOAT KIT HOME KIT Special Design Alarm option - $1.50 and power supply Included. 0-149' F. 534.95 526.90 Case $3.50 AC XFMR - $1.50 $16.95 5 Digit Countdown Utility 6 Digit General Purpose or 6 DIGIT ALARM CLOCK KIT Darkroom Timer Kit Computer Timer Kit - $29.95 Features: Litronix dual 1/2" displays, Mostek Features: Large LED 112" displays oper. from 0.1 sec. to 59 min. Features: Large LED 1 /2" displays, Mostek 50250 super clock chip, single I.C. segment 59.99 sec. 5A -115V. Relay Included to 50397 counter display/driver, counts up to driver, SCR digit drivers. Kit includes all ne- control appliances. Operates on 115V 59 minutes, 59.99 seconds with crystal con- cessary parts (except case). Xfmr optional. AC. Displays can be turned off for total trolled 1/100 second accuracy, operates on Eliminate the hassle. darkness while counting. All necessary 115V AC or 12V DC supply. All necessary parts included. $44.95 parts included. Special design case $3.75. AC XFMR - $1.50 Case $3.50 Special design case $3.75. Bowmar 4 Digit LED Readout Array NEW COMPETITION CHESS TIME KIT Low Cost Cassette Full 1/2" Litronix Jumbo Dual WITH TWO INDEPENDENT FIVE DIGIT Digit LED Displays 1/2" LED DISPLAYS Interface Kit 4 JUMBO .50" DIGITS ON ONE STICK) The timers can be used in- $14.95 WITH COLONS & AM/PM INDICATOR dependently or coupled. The timer can be set to 59 $3.95 Features: K.C. standard minutes 59.9 seconds at 0.1 2400/1200 Hz, 300 Baud, TTL, I/O DL 722 - 728 - C.C. DL C.C. Intervals Kit includes all $79.95 compatible, phase lock loop, 22 pin connector. Feeds serial data via microprocessors DL 721 8 C.A. DL 727 - C.A. hecessar parts and an at- I/O ports and (role cassette tape recorder. 99c $1.29 tractive woodgrain case. Complete Kit $14.95 MICROPROCESSOR FLAT PACK TRIMMER''OTs IC ASSORT. ELECTRICAL COIL CHIPS THERMISTORS TANTALUM CAPS 2 TRANSISTOR 10K, 20K, 25K RAM'S FLAT PACK 5400 13T TYPE C for 8212-I/0 port 350 1 MFD. 20VDC. AUDIO OHM. Mini PC MEPCO - NEW) SERIES. SPECIAL 107 TYPE C P.C. LEADS boards. 8214-P I C 12.95 21L0250ON$ 8/11.50 1.5K OHM BUY FROM ITT. aml. W/ Specs. YOUR CHOICE YOUR CHOICE 8216 Non Invent Bus 4 95 21L02 -250N0 8115.95 s/51.00 15 for 51.00 20 Assorted 6/$1 - 12IS1 10/51. 8224 Clock Gen 4 95 2114-4K , 14.95 Devices for 51.00 - 8154.00 8226 - Invert Bus 3 95 1101A-256 PlO for 14.95 35 Z-80 1103-1K * * * for 14.95 MK4115-8K 19.45 CTC Z-80 74S200256 395 8228 Sys. Controller 8 20 8251 Prog. comm. Interface 10.95 SILICON 8255 Prog. perp. interface 13.50 DISC CAPS BALUM STANDARD COILS AUTO COIL RECTIFIER NEW GAMMON 8820 Dual Line Recr 1 75 FOR BYPASS Used In TV Tuners TRANF. JACKS Special! Use in TV sets. 1.2 8830 Dual Line Dr 1 75 .01 MFD- 100 be rewound 104007.1 AMP CPU'S Can uh 5% aed 1.5 un Ideal for inc ruder. PART a 450-4352 2513 Char. Gen 7 50 wVDC. PC leads. for Ham freq. 10%. Yocr choice. Gold Plated 1000 Ply. 2-80 includes manual 29.95 8838 Quad Bus. Recvr 2 00 40/51. 6/51 12(51 12!$1 SO/51 PRIME UNITS Z -80A Includes manual 34.95 10/$1- 74LS138N - 1l8 decoder 99 8080A CPU BIT 11.95 8T97 -Hex Tri-State Buffer 1 25 8008 CPU BIT 695 * * 148811489 RS232 1 50 * * TR 1602B Uar: 3 95 Pholocoll Asst. RESISTOR We bought almost PLASTIC READ- a US Special! ASST. 200K from big OUT FILTERS DISC CAP P.C. LEAD CO ODES PROMS mtg. Three product TTL ASSCRTMENT 22 Ohm. 1 Watt. PC leads. AI least families: mall, Originally used In Carbon Comp. 10%. 104146/1 N914 1702A - 1K desk 10p ralcula- Conners a nigh 10 different values: -100/S200 -1.5us 395 or 10/35. medium and dual Handy value. Paral- lora. Perfect for use yield 01 usableparts. includes .001, .01. Z-80 PROGRAMMING 2708 - 8K Intel - 450ns 14.95 photocells. Perfect lel to make low ohm- 1114002. IA with LED and other 50/51.50 .05 plus other stan- 5204 - 4K 7 95 for all light en' age power resistor. - loo Plv MANUAL type readouts. dard values. 825129-1K 250 live applications. Help/ We bought a0/s1.00 40/51.0] AMBER -61or $1. 27085 8 8K signetics 650ns 9 95 100.000 pieces! * 12/51.00 * * 25 for 51. * k IN DEPTH DETAIL OF COUNTER CHIPS MICRO -DIP $1.95 JOY STICKS THE Z-80 CPU MICA TRIMMER MICRO -COMPUTER MK50397 6 Digit elapsed timer 8.95 New - Series 2300 FOUR 100 K -OHMS STANDARD MK50250 Alarm clock 4.99 PC 402 Miniature The Id's Smallest ANT. T. P.F. Wo MK50380 Alarm 295 1.5-20 POTS Used for Ant. Hook- chip P.C. Mount Coded BCD Dual -In -Line MK50396 6 digit up/down counter 12.95 up on all TV sets. S.D. Sales Special a/s1 Switch) PC Mount Ideal -' MK5002 4 digit counter 8.95 for 1211 2300 02G BCD 1-2-4-8 MK5021 - Cal. chip sq. root 2.50 / $9.95 2300 12G BCD 1-2-4-8 electronic Compliment games $3.95 11.42,41MOssu. Choose $1. Free Merchandise From Asterisk Items on each $15 order! NO COD's. TEXAS RESIDENTS ADD IN YOUR Texas Residents Call Collect: CALL BANKAMER- 5% SALES TAX. ADD 5% OF ORDER ICARD (VISA) OR MASTER 60 Day 214/271-0022 Zeros - FOR POSTAGE & HANDLING . OR- CHARGE ORDER IN ON OUR DERS UNDER $10. ADD 75c HAND- CONTINENTAL TOLL FREE LING.FOREIGN ORDERS U. WATTS 1-800-527-3460 Hack juaraHtee! - LINE: DEALER INQUIRIES INVITED) »mrey FUNDS ONLY) SI I CIRCLE NO. 41 ON FREE INFORMATION CARD AmericanRadioHistory.Com MORE THAN 20,000 DIFFERENT COMPONENTS 7400 TTL LINEAR NEW FROM NEWTQNE 400 .18 7442 1.08 74107 .49 754508P .49 LM301H .35 LM741CH .45 7401 .21 7448 1.15 74121 .55 754518P .39 LM307H .35 LM747 .so Regulated Power Supply Components Kit Contains the 7402 .21 7450 .26 74122 .49 75452BP .39 LM309K 1.25 LM748H .45 7404 .21 7451 .27 74123 1.05 754538P .39 LM311H .90 1M14585 .80 components needed to build a fixed -voltage regulated 7405 .24 7453 .27 74125 .60 7545413P .39 LM318N 1.50 N5556V 1.50 supply including: 117/17V- 1 ampere Transformer, Bridge 7407 .45 7454 .41 74126 .81 75491 BP .79 LM339N 1.85 NE5558 1.00 7408 .25 7460 .22 74132 3.00 75492BP .85 LM351AN .65 NE555V .60 Rectifier, 2000 uF Capacitor, and a 1 ampere LM340 7409 .25 7472 .39 74141 1.15 CA3005 1.60 LM3705 1.25 NE556 1.50 7410 .20 7473 .45 74150 1.10 CA3006 3.50 LM380N 1.45 UA702 .80 3 -terminal IC Regulator. Makes a fine "on board" supply 7411 .30 7474 .45 74151 1.25 CA3018 1.10 LM566 2.25 UA703CH .45 or use it for breadboarding. Components only. Specify 7413 .85 7475 .80 74153 1.35 CA3018A 1.60 LM711CH .60 UA709CH .30 7416 .43 7482 1.75 74154 1.54 CA3026 1.50 LM723H .75 UA749CH 45 5, 6, 8, 12 or 15 volts. NT525 $4.99 7417 .43 7483 1.15 74157 1.30 CA3046 .35 LM741CN .45 7420 .21 7485 1.12 74161 1.45 Pioneer 6" Speaker 71/2 -watt, 3.2 -ohm speaker made 7422 1.50 7486 .45 74164 1.65 IC's ON THE MOVE 7425 .43 7489 2.49 74165 1.65 BBD BUCKET BRIGADE DEVICE the way speakers should be made. Has heavy-duty treated 7427 .37 7490 .69 74166 1.70 M M 3001 19.50 M N 3002 11.70 paper cone, magnet housing, and a ceramic 7428 .35 7491 1.20 74174 1.95 protected 7430 .26 7492 .82 74175 1.95 MM3003 9.45 terminal strip marked with polarity. A beautiful speaker 7432 .31 7493 .82 74180 1.05 HALL IC:DN834 1.25 DN837 1.50 7437 .47 7494 .91 74181 3.55 at half the price you'd expect. NT526 $2.39 Three for $6.00 7438 .40 7495 .91 74191 1.50 DN835 1.35 DN838(NEW) 7440 .21 7496 .91 74195 1.00 PC Boards -MIL grade, 1Í,e" glass -epoxy boards with 2 - 7441 1.10 74100 1.25 74197 1.00 ZENER DIODES ounce copper on one side. 1/2 10% $ 30 each to 33 V Watt, ± NT521 6"x3" $.50, NT522 6"x6" $.90' NT523 6"x8" $1.20 74L SERIES TTL 1 Watt, ± 10% $ 40 each to 33 V Dry Transfer Patterns for PC Boards - Includes 0.1" spaced 74L00 .33 74LSO4 .45 7415113 .98 Voltages to 200V, and ± 5% Available 74L10 .33 741510 .39 7415138 1.89 IC pads, donuts, angles, and 3 -and 4 -connector pads. 74L30 .33 741S20 .39 741S174 2.50 1 Megohm Potentiometer Made by Claro- 74L42 1.50 741551 .39 74LS386 5.50 stat.'l;' diam., split, knurled shaft 1/2" long. / Over 225 patterns on a 2" x 71/4" sheet. NT520 $1.49 74L86 .69 741574 .65 74S153 2.25 NT544 5.39 Three for $1.00 741500 .39 741,5112 .65 74S387 1.95 // 3PDT - 24 Volt DC Relay Potter & Bromfield KUP14D15. 74H00 TTL Each contact can handle 10 amperes at voltages to 240 Vac. resistance is 450 A super buy! Limited quantities. 74H00 .33 74H11 .33 74H53 .39 5400 SERIES VOLT.REG Coil ohms. 74H01 .33 74H20 .33 74H55 .39 r NT508 $.99 5400 1.00 74H04 .33 74H21 .33 74H73 .59 5475 1.50 LM340K-5 1.95 5404 1.25 74H05 .35 74H30 .33 74H74 .59 5486 1.90 LM340K-6 1.95 5410 1.00 5" Taunt -Band Meter One milliampere full scale, 31/2", 74H10 .33 74H40 .33 74H76 .65 5493 2.00 LM340K-8 1.95 5426 1.25 54100 1.80 LM340K-15 1.95 scale length. Coil resistance 465 ohms. Made by Modutec 5473 1.50 541_504 1.00 LM340K-18 1.95 MOTOROLA LM340K-24 1.95 for Bose. Meter scale in VUs (-20 to + 30). Meter is de- LM340T0-5 1.75 signed to be mounted coil up. Complete with "smoke" MC663P 2.50 MC1460 3.95 RESISTORS LM340T0ó 1.75 MC666P 1.60 MC1469R 2.50 LM340T0-8 1.75 plastic cover. Over-all 51/8"x4". Meter face mounts in a MC670P 1.60 MC1489 4.60 % Watt t 5% Packed 5 of any one value 25 LM340Ta121.75 MC679P 2.50 MC1496 1.65 S 11J1340T0-15 1.75 5118"x2318" cutout: A beautiful meter. NT539 $4.89 /, Watt ± 5% Packed 5 of any MC725P 1.50 MC1510G 8.00 one value LM340T0-18 1.75 MC789P 1.50 MC1514L 4.50 S30 LM340T0-24 1.75 Aluminum Knob -Solid knob with RESISTANCE machined aluminum MC79oP 1.50 MC1595L 6.25 ` VALUES MC817P 1.30 MC1723CL 3.60 fluted sides made for Bose. Black front -face insert, black MC836P 1.35 MC1741 CG . 1.20 \I:ANDAADSEE OURAD ON JAPANESE pointer line. Fits flat 1/4" shaft, does not require set screws. MC844 1.25 MC1810P 1.25 AND MC853P 2.25 MC3004L 2.25 TRANSISTORS IC's .8 high, .7 diam. Easily worth $1.50 NT540 $.82 2 for $1.50, MC876P 2.25 MC3007P 2.25 IN THIS ISSUE. MC1004L 1.25 MC3021 L 2.15 MC1010L 1.25 MC3060L 2.65 MC1305 1.95 MC3062L 3.00 MINIMUM ORDER $5.00 MC1352P 1.55 MC4024P 2.20 rAll orders add 1.00 Postage and Handling. MC1357 1.70 MC4044P 4.80 % BOSE SPEAKERS MC1371 1.85 MC14507CP 1.25 Canada $1.50 Bose has discontinued their original 301 System. MC1439 2.65 MC14511CP 2.76 New MC1458P .50 MC14512CP 1.70 N.J. Residents add 5% sales tax -Tone purchased the speakers remaining in inventory when the 301 was discontinued, and is ELECTROLYTIC CAPACITORS offering them at prices that seem impossible. C MOS 2.2MF50 Axial Leads .15 30MF25 Axial Leads .18 The speakers have been tested with the Bose 3.3MF1 0 Axial Leads .15 47MF25 Radial 4001AE .29 4023AE .29 Leads .19 "Tone Standard" as a reference and have been 4002AE .29 4024AE 1.50 3.3MF10 No Polarity .15 47MF50 Radial Leads .24 4007AE .29 4025AE .35 10MF25 Axial Leads .15 100MF16 Radial Leads .19 subjected to the Bose power -handling test which 4010AE .58 4028AE 1.60 10MF50 Axial Leads .16 100MF25 Radial Leads .24 includes both fixed and sweep -frequency testing. 4011AE .29 4029AE 2.90 10MF150 Axial Leads .20 SOOMF50 Axial Leads .60 4012AE .29 4030AE .65 25MF35 Axial Leads .18 1000MF35 Axial Leads .65 8 -Inch Woofer (Bose Part No. 102606) has a free - 4015AE 1.25 4037AE 4.50 air resonant frequency of 25-35 Hz., and has a 4016AE .65 4040AE 2.40 MICROPROCESSOR 4018AE 1.10 4044AE 1.50 C1702A 9.95 2708 34.95 8008 19.95 1.5", 8.5 -ounce magnet. The upper tested -fre- 4019AE .65 4049AE 75 2101 5.75 C5101-3 4.50 8080A 19.95 quency is 4000 Hz. 4020AE 1.75 4050AE .75 2102 1.75 MM5013 3.25 8224 10.45 / \sillZ21AE 1.50 Contact us for all your microprocessor needs. 3 -Inch Tweeter (Bose Part No. 107376) has a free -air resonant frequency of 1200-1500 Hz., and has an upper tested -frequency of 16.5 kHz. RECTIFIERS UNIJUNCTIONS HARDWARE - SOCKETS Supplies are limited. We 'urge you to take ad- 10 100 Nylon Screws, Nuts and Rivets - 50 piece assortment 51.99 vantage of these prices and stock up for your For For 2N2160 .65 MU4892.50 MK 20 TO -3 Mounting Kit 5 for 5.99 1N4001 .60 5.00 2N2646.45 MU4893.50 NT -505 Mica and bushing. Specify future needs, 154002 .70 6.00 252647 .55 MU4894.50 TO -3, T0-66 or TO-220 10 sets for 5.99 Sorry, we have nó information about the Bose 154003 .80 7.00 2N4851 .75 2N6027 .55 IC Socket 14 -Pin OIL 5.25 each enclosures or the crossover networks; nor do 1N4004 .90 8.00 2N4852.75 2N6028.70 IC Socket 16 -Pin DIL 9.27 each 1N4005 1.00 9.00 2N4870 .50 D5E37 .35 Wire Wrap 16 -Pin DIL 5.32 each we have more specs. Bose says these data are 1N4006 1.10 10.00 2N4871 .50 MU10 .35 proprietary information. \\124007 1.20 11.00 MU4891.50 MU20 .40 8" Woofer NT541 $10.95 3" Tweeter NT542 $ 3.95 POPULAR JEDEC TYPES N34 .25 2N1540 .90 2N2712 .18 2N3394 .17 2N3856 .20 2N4402 .16 1N60 .25 2N1544 .80 2N2894 .40 2N3414 .17 2N3866 1.25 2N4403 .20 1N270 .25 2N1554 1.25 2N2903 3.30 2N3415 .18 2N3903 .16 2N4409 .20 1N914 .10 2N1560 2.80 252904 .25 253416 .19 2N3904 .16 2N4410 .16 1N4148 .25 2N1605 1.75 252904A .30 253417 .20 2N3905 .16 2N4416 .75 1S1555 .35 251613 .50 2N2905 .25 2N3442 1.85 253906 .16 2N4441 1.00 2N1711 .50 252905A .30 253553 1.50 2N3954A 3.75 2N4442 1.15 2N173 1.75 2N1907 4.10 252906 .25 253563 .20 253955 2.45 2N4443 1.35 25338A 1.05 252102 .70 252906A .30 253565 .20 2N3957 1.25 254852 .55 2N404 .75 252160 .70 252907 .25 253638 .20 2N3958 1.20 255061 .30 2N443 2.50 252218 .25 252907A .30 253642 .20 2N4037 .60 2N5064 .50 25508A .45 252218A .30 2N2913 .75 253643 .20 2N4093 .85 2N5130 .20 NEW-TONE 2N706 .25 252219 .25 252914 1.20 2N3645 .20 254124 .16 2N5133 .15 2N718 .25 252219A .30 2N3019 1.00 2N3646 .14 2N4126 .16 255138 .15 25718A .30 2N2221 .25 253053 .30 253731 3.75 254141 .20 2N5294 .50 2N918 .60 252221A .30 2N3054 .70 2N3740 1.00 2N4142 .20 2N5296 .50 2N930 .25 2N2222 .25 2N3055 .75 2N3771 1.75 254143 .20 2N5306 .20 ELECTRONICS 2N956 .30 252222A .30 2N3227 1.00 2N3772 1.90 254220A .45 2N5400 .40 2N1302 1.25 2N2270 .40 2N3247 3.40 2N3773 3.00 2N4234 .95 2N5401 .50 251305 .75 2N2369 .25 253250 .50 2N3819 .40 2N4400 .16 2N5457 .35 PO BOX 1738A BLOOMFIELD, N.J. 07003 251429 .20 2N2484 .32 253393 .20 2N3823 .70 2N4401 .16 2N5458 .30 PHONE: (201) 748.6171, 6172, 6173 / ALL PARTS GUARANTEED WRITE FOR FREE CATALOG 94 CIRCLE NO. 29 ON FREE INFORMATION CARD POPULAR ELECTRONICS AmericanRadioHistory.Com INI-KITS Frequency CTSO he9ar_er FM WIRELESS Input MIKE KIT Counter FM.1 52.96 11.31C1425 Transmit uo l0 ,lo any r . $79.95 r, FM rear uSen. lil,ave Mike KIT 4Ib c . Runs . crye "1 or ensor, m4 on 3 lÓ 9 volts. n You've requested it, and now it's !-ere! The CT -50 Fre- s TONE DECODER KIT quency Counter Kit has more features than counters selling A complete lone decoder on a rangle PC UTILIZES NEW MOS-LSI CIRCUITRY Board. Features 400 to 5930 Hz ~stable for twice the price. Measuring frequency is now as easy as ci frequency range voltage regulation. 55716. a the CT -50 will automatically place the SPECIFICATIONS 111.21<':, FNmogáNáblm pushing button, button mucmonede- in reliable read- dnuns on S to 12 voló. decimal point all modés, giving you quick, Sensitivity: less than 25MV Corp,.le Kit. T13.1 $4.96 ings. Want to use the CT-50 mobile? No problem, it runs Frequency range: 5Hz to 60MHz, typically 65MHz VDC it 110 VAC. Want LED equally as well on 12 as does on Gate time: 1 second, 1/10 second, with automatic decimal BLINKY KIT super accuracy? The CT -50 uses the popular TV color burst point positioning on both direct and prescale ItM1,wd go- "°r=I:1 freq. of 3.579545 MHz for time base. Tap off a color TV with es2LEthtrtw Display: 8 digit red LED .4" height boa^en, our adapter and get ultra accuracy .001 ppm! The CT -50 TV o mg - Accuracy: 10 ppm, .001 ppm with time base! 40. PM el ilgñia offers professional quality at the unheard of price of $79.95. Complete Kit. 131.1 5295 Input: BNC, 1 meg ohm direct, 50 ohm with prescale option Order yours today! Power: 110 VAC 5 watts or 12 VDC@ 1 Amp SUPER -SNOOP AMPLIFIER Kit Size: Approx. 6" x 4" x 2", high quality aluminum case A super.xmn,ve ample r winch enl pick CT -50, 60MHz Counter $79.95 .Pin drop e ns lee ooreat for CT-50WT, 60 MHz counter, wired and tested $159.95 Color burst adapter for .001 ppm accuracy available in 6 FFu112 wausoroulpw°rn:o Blo volts. uses any lee of mike. Roam. ISM CT -600, 600 MHz prescaler option for CT -50, add $29.95 weeks. CB -1, Kit $14.95 r ohm speaker, Complete Nit. 135.9 54.95 VIDEO TERMINAL MUSIC LIGHTS KIT SIX DIGIT CAR IC I t See rem. co aloe, e eieereni 1191o, ckwow musk or wee. One light KIT $149.95 t2 'GP HR CLOCK for the mid -range end one 10 me 12/24 A 5 x 10 -Inch PC card that requires only an ASCII key- nigh,.caco channel haters, wWaleem. compact for pan,ea board and a TV set to become a complete interactive terminal for KIT $27.95 O muaÍc Ana cae3,aormeae Its -- CLOCK KIT connection to your microprocessor asynchronous interlace. 1224 -Hour 12 -Volt AC or DC 81.120.016191511 Complete Nit. ML -1 57.96 many features are single 5 -volt supply, crystal controlled sync and High Accuracy Il Minute/month) SO50 Want a clock that looks good enough for your living room? rammerarah SIREN KIT baud rates (up to 9600 baud), 2 pages of 32 characters by 16 Ones, 6 lambo 4" LED readouts Forget the competitor's kludges and try one o1 ours( Features: jum- tea writ read to and from memory. computer and keyboard -operated cursor Easy, no.polarlty hookup Yá"0 ue""`" Nor.. case available -k or pot. seen. 200,me audi and control, parity error display and control, power -on ini- bo .4" digits, Polaroid lens filler, extruded allminum Display blanks with ignition runs on 3.9 volts uses e-45 ohm page o put. 5 quality PC boards and super Instructions. All pans are Included moo Far 11411 tleliaat!on, lull 64 -character ASCII display, block -type see-thru cur- in colors, Case mounting bracket Fully guaranteed. One to two hour as- COP tack _gimlets Nit SM-3 52.95 sor. Keyboardlcomputer control backspaces. forward spaces. line Included, no extras to buy. Super Instrueuons Complete Nit, DC -11 52796 feeds, rev. line leads, home, returns cursor. Also clears page. sembly time. Colors: silver, gold, black, blue and bronze (speclly). CODE OSCILLATOR KI, clears to end of line, selects page 1 or 2, reads from or to memory. Powerful l Hag ere o osclGmpr kHz. goon ormalarm Ñker, oo wox. 1 The card requires 5 volts at approx. 900 ma and outputs standard Clock Kit, DC -5 522.95, ow, and LINEAR REGS TRANSISTORS 75 ohm composite video. Alarm Clock, DC -8. 12 hr. only 524.95 code 05C1.101. NPN type DC -5 with 10 mm. ID timer 525.95 555 .50 309K .99 2N3904 10,51.00 Com 1 a Mt CPO.1 52.60 T113216 Kil 5149.95 Mobile Version, OC-7 525.95 556 .75 340K-12 .99 PNP 2N3906 type 10,51.00 TH3216, Assembled and Tested 5239.95 7805 NPN Power Tab 40W Assembled and tested Clocks available, add ' 566 1.49 .99 3/51.00 Vol.- Video to RF Modulator Kit 5 6.95 40W POWER SUPPLY KIT 510.00 to kit price. 567 1.49 7812 .99 PNP Power Tab 3/51.00 a rav Comp,.tl is . -_ 324 1.49 7815 .99 FET MPF-102 type 3/52.00 able 215ulalevo al 1 yarn kMa requlelbona, good 1458 .49 78MG 1.50 UJT 2N2646 type 352.00 volts p. 600 mHz 741 MINI DIP, house marked lorsz.00 380 1.49 723 .49 2N3055 NPN Power .75 eeee ní1 ' 1eto31CTis Complete Nit. P5.310 5695 Prescaler ti Sétislectlun guar.. Fully assembled and tested. ,d o, money DECADE COUNTER PARTS KIT Extend the range of your counter to 10 times higher in frequency. ea oreen undere, a . 3+IEctroruics' MHz llch, raruS3I 7a9+1133 counter. III COD add ui LEO o k upLaeD,rs.vtl Works with any counter. High sensitivity Input with built-in on chip ordene wed 75e. bers Insrructonlon orders 55.00`-xNY add )X r hoe o P.1ia n easy low wet Imo. counter. pre -amp. BOX 4072A ROCHESTER, NY 14610 1716) 27.1-6487 509.95 . welcome 1 Nil of Parta. DCU1 5950 PS -1B, 10 CIRCLE NO. 40 ON FREE INFORMATION CARD GMOS CMOS CMOS TÉIIAS INSTRUMENTS TTL PLASTIC DUAL -IN -LINE I.C. CD40008E .13 CD4052BE 1.15 74 C14/40014 PC .75 I.L. SOCKETS 74C85/40085PC 1.20 (Low Profile Solder Tail) SN7400N .12 SN7453N .14 SN74132N .69 SN74186N 7.50 CD4001BE .16 CD4053BE .89 SN7401N .14 SN7454N .14 SN74136N .59 SN74S188AN 1.85 CD4002BE .16 CD40558E 1.29 80C97/40091P1' .65 Unit SN7402N .14 SN7460N .14 SN7414IN .88 SN74190N 1.04 C04006BE .99 CD40608E .99 80C98/40098PC .65 Description Price SN7403N .14 SN7470N .26 SN74142N 3.70 SN74191N 1.04 CD4007BE .16 CD4066BE .59 74C160/40160PC 1.50 8 Pin DIL (C840802) .15 SN7404N .17 SN7472N .25 SN74143N 3.98 SN74192N .84 CD4008BE .80 CD4068BE .24 74C161/40161PC 1.50 14 Pin DIL (C841402) .18 SN7405N .17 SN7473N .29 SN74144N 3.98 $N74193N .84 CD4009BE .37 CD4069BE 24 74C162/40162PC 1.50 16 Pin DIL (C841602) .19 18 Pin DIL (C841802) .29 SN7406N .25 SN7474N .28 SN74145N .69 SN74194N .89 CD4010BE .37 CD4010BE .24 74C163/401631'C 1.50 20 Pin DIL (C842002) .35 SN7407N .25 5N7475N .46 SN74147N 1.58 SN74195N .54 CD40l1BE .16 C04071 BE .24 74C174/401741'C 1.40 SN74148N 1.19 SN74196N .87 22 Pin OIL (C842202) .34 SN7408N .17 SN7476N .30 CD4012BE .16 CD4072BE .29 14C175/401151'C 1.40 SN7409N .17 SN7480N 35 SN74150N .94 SN74197N .73 24 Pin DIL (C842402) .34 CD4013BE .29 CD4073BE .29 74C192/401921'C 1.50 SN74 ION .14 SN7481AN .95 SN74151N .61 SN74198N 1.64 28 Pin DIL (C842802) .45 CD4014BE .14 CD4075BE .29 14C193/401931'C 1.50 SN7411N .20 SN7482N .55 SN74I52N 3.45 SN74199N 1.64 40 Pin DIL (C844002) .65 C04015BE .74 CD4076BE .98 74C194/40194PC 1.40 SN7412N .21 SN7483AN .65 SN74153N .61 SN74221N 1.14 SN7413N .39 SN7484AN 1.50 SN74154N .95 SN74246N 1.95 CD40l6BE .29 CD4078BE 24 74C195/40195PC 1.40 SN74I4N .62 SN7485N 84 SN74155N .70 SN74247N 1.70 C040178E .79 CD40B18E .24 VOLTAGE REGULATORS SN7416N .24 SN7486N .30 SN74156N .64 SN74248N 1.75 CD4018BE .79 CD4082BE 29 SG3501AT 3.60 ±58 Dual Tracking Regulator SN7417N .29 SN7489N 1.85 SN74157N .59 SN74249N 1.75 CD40198E .38 CD4085BE .75 SG35241 7.25 Switching Regulator Converter SN7420N .14 SN7490AN .43 SN74159N 2.50 SN74251N 1.05 CD4020BE .84 CD4086BE .75 SG4501T 1.80 ±15V Dual Tracking Regulator SN7421N .20 SN749IAN .59 SN74160N 85 SN74259N 1.35 CD40218E .89 CD4502BE 1.15 RC4194TK 3.95 Variable Dual Tracking Regulator ±359 ±9.58 SN7422N .20 SN7492AN .44 SN74161 N .85 SN74265N .85 CD4022BE .89 CD4507BE .39 RC4195T 2.35 Fixed ±158 Dual Tracking Regulator TOS SN7423N .25 SN7493AN .44 SN74162N .85 SN74273N 1.35 CD40238E .16 CD4510BE 1.05 RC4195TK 3.15 Fixed ±158 Dual Tracking Regulator T066 SN7494N SN74163N .85 SN74276N .75 SN7425N .25 .69 CD4024BE .67 CD4511BE 1.25 78H05KC 6.35 5 Amp 5 Volt Positive Regulator T03 SN7426N .22 SN7495AN .67 SN74164N .98 SN74278N 1.99 Positive Voltage Regulators (Plastic) I amp CD4025BE .16 CD4512BE .69 7800 Series .99 SN7427N .25 SN7496N .65 SN74165N .97 SN74279N .57 TD -220 / LM340T 5. 6. 8, 12, 15, 18, 24 Volts CD4026BE 1.39 CD4514BE 2.50 SN7428N .28 SN7497N 2.50 SN74166N 1.09 SN74283N 1.39 78M00 Series 1.39 Positive Voltage Regulator 1/2 Amp CD4027BE .38 CD4515BE 2.50 SN7430N .14 SN74100N .97 SN74167N 2.75 SN74284N 4.50 TO.5 / LM340H 5, 6, 8, 12, 15, 18, 24 Volts CD4028BE .74 CD4516BE .84 SN7432N .23 SN74104N .42 SN74170N 1.69 SN74285N 4.50 7800 Series 1.49 Positive Voltage Regulator 1 Amp SN7433N .30 SN74105N .42 SN74172N 8.75 SN74290N .85 CD4029BE .78 CD4518BE .84 T0.3 / LM340K 5, 6, 8. 12. 15, 18, 24 Volts SN7437N .21 SN74107N .28 SN74I73N 1.24 SN74293N .83 CD4030BE .31 CD4519BE .79 78100 AWC Sedes .29 Positive Voltage Regulator 100 MA SN7438N .21 SN74109N .47 SN74174N .94 SN74298N 1.64 CD4033BE 1.60 CD4520BE .79 TO.92 2.6, 5, 6.2. 8.2, 12, 15 Volts SN744oN .14 SN741ION .52 SN74175N .84 SN7435IN 1.92 CD4034BE 2.95 CD4522BE 1.98 7900 Series 1.25 Negative Voltage Regulator 1 Amp 5N7442N .37 SN7411IN .69 SN74176N .77 SN74365N .65 CD4035BE .98 CD4526BE 1.50 TO.220 / LM3ZOT 5. 6, 8. 12, 15, 18, 24 Volts SN7443N .68 SN74116N 1.50 SN74177N .76 SN74366N .65 CD4040BE .99 CD45218E 1.50 19M00 Series 1.35 Negative Voltage Regulator 1/2 Amp SN74367N .65 SN7444N .85 SN74120N 1.40 SN74178N 1.19 CD4041BE .67 CD4528BE 1.20 TO5 / LM320H 5, 6, 8, 12, 15, 20. 24 Volts SN7445N .65 SN74121N .34 SN74179N 1.49 SN74368N .65 Negative Voltage Regulator 1 Amp CD4042BE .58 CD4531BE 1.25 1900 Series 1.75 SN7446AN .70 SN74122N .38 SN74180N .67 SN74376N .75 TD -3 LM32OK 5, 6. 8, 12, 15, 18, 24 Volts CD4043BE .45 CD4539BE 1.20 / SN7447AN .59 SN74 I23N .48 SN74181N 1.94 SN74390N 1.40 78MGT2C 1.20 Dual In Line Adjustable 4 Terminal C040448E .45 CD4555BE .75 SN7448N .69 SN74125N .40 SN74182N .59 SN74393N 1.40 Positive Voltage Regulator CD4046BE 2.45 CD4556BE .75 SN7450N .14 SN74126N .40 SN74184N 1.75 SN74426N .45 79MGT2C 1.20 Dual In Line Adjustable 4 Terminal SN7451N .14 SN74128N .59 SN74185AN 1.74 SN74490N 1.90 CD40478E 2.45 CD4581BE 2.25 Negative Voltage Regulator CD4582BE CD4049BE .34 .95 78GU1 T0-220 1.45 I Amp Adjustable Positive Voltage Regulator CD4050BE .34 C04585BE 1.80 79GU1 TO.220 1.25 I Amp Adjustable Negative Voltage Regulator CD4051BE .89 78GKC TO -3 1.80 I Amp Adjustable Positive Voltage Regulator I n _ 79GKC TO.3 2.10 I Amp Adjustable Negative Voltage Regulator L azo Our new comprehensive 1978 Catalogue, listing d¡. o 1'1' K 1 complete descriptions, il- . .. ks P.O. BOX 1035 FRAMINGHAM, MASSACHUSETTS 01.701 lustrations and special OVER-THE-COUNTER SALES, 12 Mercer Rd., Natick, Mass. 01160 Behind Zayres on Rte. 9 monolithic pricing on Telephone Orders & Enquiries 1617/ 8 79-007 7 MINIMUM ORDER 110.00 ADD 52.00 TO COVER POSTAGE IN CANADA 5651 Ferrier(. 44 Fesken Dr -0n1126 customers add 15% for exchange and Montreal. 000401,. bad.'HANDLING lt e 0aned.00 items, is now Quebec Ontario please over 10,000 2 Locations nxt payment oaln and ' mle nationalsbank' drafto intetnation, 101.15141 735-6425 Tel. (4161676-3311 available on request. postal money order in American dollars. 4 CIRCLE N0. 3 ON FREE INFORMATION CARD AmericanRadioHistory.Com NEW WIDE FIELD TELESCOPE Astroscan lets you enjoy clear, bright, wide- angle views of stars, moon, comets, etc. Com- KNOW YOUR pletely portable, this unique 41/4", f/4 New- ALPHA FROM THETA! tonian reflector houses top quality optics. De- For greater relaxation & concentra- signed for ease of handling and use, Astro - tion, monitor your Alpha/Theta scan weighs only 10 lbs. and stands 17" high. brainwaves with audio or visual What an instrument! signals on Biosone II. Features of No.2001 .... $200 -up units. Incl. 3 feedback modes! 4 -lb. No.1668 $149.95 $149.95 Ppd. -t11 Ppd. No. 71,809 (FOR BEGINNERS) $59.95 Free' SAVE 25%-DELUXE AM/FM WALL RADIO Catalog Great surplus buy saves you 25% on brand new AM/FM Deluxe Wall Radio w/ handsome silver/ black control panel. Mount anywhere STOP WATCH WITH PROFESSIONAL den, kitchen, bedroom, office, workshop. Self-cont. Philco-Ford TIMING ACCURACY FOR ONLY $39.95 1 radio chassis (141/40311/46031/2") w/11 Used at AAU, NCAA, and the Olympics this transis- tors, vol. control, AM/FM hi -sensitivity AFC, 13 two function stop watch times single seg- tuner, 23/4" dia. speaker, 71/2" 110V ments of events with time in/out delays. Gonw'(,Y. AC cord. Orig. cost $30 ea. in 3000 quant. for motel Press the button and stop watch displays nat'l chain. Buy several now. time action stopped-then resumes with ® No. 72,25 (READY next button press. Accurate to 1 sec./yr.; bright LED display reads to 59:99.99, runs TO PLAY!) $22.50 Ppd. on disposable batts. (incl.); lanyard; 1-yr. warranty. No. 1695.... $39.95 Ppd. MAX: MIN. THERMOMETER FIND OUT HOW COLD IT WAS REST YOUR MIND WITH THE EDMUND This self -registering maximum -mini- - - Tree Catalog . PROFESSIONAL SOUND CONDITIONER mum thermometer shows high and TRACK 6 Unique new scientific device masks y, low temperatures in 2° increments FORECAST THE WEATHER unwanted noise while adding rest- / from -40 to +120 F. See how WITH YOUR HOME WEATHER STATION ful, interesting background sounds. 4 Modern now temperatures vary in a day or why The Edmund Deluxe Weathei Station electronics simulates 'z'.«/"A,1 fuel costs are so high for a given combines high quality instraments soothing sounds of ocean surf, period. Resets with magnet. Mount- with the best forecasting ma:erials. falling rain, and a rushing waterfall. dia. - ing screws. 21/2 x 101/2". Measure wind speed, barcmetric 5" speaker, on off volume controls, tone con- No. 71,478... . pressure, precipitation, tempera- ture, humidity, cloud types á wind- trol, & 4 sound channel ad- chill. Kit includes: wind indicator, rain holosteric justments. 71/2' AC cord, $16.00 Ppd. speed gauge, barometer, thermometer, wet & dry bulb hygrometer, 372-pg. 51/2071/2061/2. Ppd. Weather Log, cloud chart, wind-chill chart, No. 72,293... $129.95 , and U.S. Weather Bureau symbol log. No. 80,216... Ppd. SUPER POWER $79.50 FOR ANY AM RADIO Antenna assist has pulled in station 1,000 miles off! Send for your FREE No wires clips, grounding. Solid state. No batteries, 164page Edmund. SPOTTING SCOPE...TAKEA tubes, plugs. GOOD LOOK... AT NATURE, SPORTS & THE WORLD Precision l0X spotting scope with fully-coated No. 72,095 .... Scientific Catalog optics. 30mm objective lens has twice the light gathering power of standard 20mm lenses. Weighs Ppd. with over $19.95 4000 bargains a mere 11 oz. and offers a field of view of 183 ft. at 1,000 yds. 10" long. ULTRA SELECT-A-TENNA No.72,218 .... No. 72,147 .... $24 95 Pd A $19.95 Ppd. p 4, 8 ""- , a.g--w ORDER . TO ORDER PRODUCTS . - !5`11i4 @ USE THIS COUPON a FREE CATALOGs_- 4 HERE J o Please send me the following items I have EDMUND SCIENTIFIC CO. indicated below: Dept. AV01, Edscorp Bldg. EDMUND SCIENTIFIC CO. Barrington, N.J. 08007 Stock No. Sty. Price Dept. AV02, Edscorp Bldg. ES Barrington, N.1. 08007 Charge my Amer. Exp. BAC (VISA) MC B.N,IumiuNO Interbank # Acct # Send GIANT 164 Page Catalog packed with unusual bargains. Card # Exp. Date Sig Name N.J. residents add 5% sales tax Handling St 00 30 GUARANTEE Address DAY Name You must be completely satis- City fied with any Edmund item or return it within 30 days for Address a full refund. Late Zip City State Zip 1 J CIRCLE NO. 13 ON FREE INFORMATION CARD AmericanRadioHistory.Com POLY,PAK'S IS THE "BARREL KIT KIÑG" OF THE WORLD! ¡BARREL KIT :253 Polly Pak'! EXCLUSIVE 17:6'2 h/ LINIE CORDS®a a,- S for BU $1.98 -li; , 7 10'a nC Potter nee...! Heavy-duty. -c -ft. lonn, ' Nle vinyl Insulu- YOUR ÚnR«.un 1 molded plug. Wt. 8 lO IÉ'B4' BDRREL CHOICE "eM1 KiTS OF BARREL KIT 9270 CHOOSE THE fl BRIDGES! BRIDGES! ANY 1 117-1-1H 20 for$1.98: . : We hl 2 tons of f, tP 1,..\ ieirJ KIT t` d 26 amp bJ; s'n.. bridges good. 'e, L. I. , , lintrwt,I and nnbh` ee,- ' S OF BARRELS PURCHASED! \I'tx9 nxs. ' 1E4022 -O . For the first time anywhere, Poly Pak throughout the United States buy BARREL KIT 1249 BARREL KIT 1244 merchandisers Introduce a new way from various factories over- UTILITY AC HOBBY t\ ... their ku f'drrir: OUTLET í OMARS in buying the economical way. Raw runs in barrels. Poly Pak has done d tl OI,I back 12 for $1.98 stock from the "barrel". Remember same. Therefore you are getting f :rest Inn AC . i,t,I 3 stele... For s 15/1 Hobby $1.98s of /thef fa- the "good ole days"? They're back the same type of material as the m n hole. with erasable program- ' mable again. The same way merchandisers RE -TESTERS DO! care leads! Wt. 12 o r ROM. 2049 Cat No. 1E3766 Cal. No. 1E3729 (BARREL KIT; BARREL KIT ;225 ¡BARREL KIT /221:/ BARIREL KIT 1219 BARREL KIT 2210 SHIELDED CA B2 LE39 POLY PAKS CHIPS AWAY SOUND TRIGGERS J- IC SOCKETS 5: IEDto READOUTS GLOWIN' PANELS. 3for 1 so r 40 -ft. $1.98 IC & XTAL PRICES $1.98 $1.98 °n6br 3 for $1.98> - $1.98 e For mikes, stereos: 1 -lend, Order Cat, No, 1E4048 and Type No. 'l land clap" s,no¡t,een cry. Burrrls of untested .170, O. a e panels that plus ahleld, 22 go. vinyl yW Sale ':l mikempilo:r, triggers 1vr unloads! Four 1e -Pus, ,3", .5, 7 -.ens, Like FNO- glow ICM7205 IM -pin. Solder tail, blue-greeen w, h 110VAC. Jacket. Wt. I Iba Stopwatch 514.95 SCR. Use f alarms, e tc! four 367, 500, 103, MAN -3'x. tiles indica- o A1'3-3500-1 'Vi. 6 1E3625 In -profile. No. 1E3621 Wet a No. Li, for nit* Cat. No.9 1E3577 Si. TV Games 9,95 ola. buy! 1(3619 tors. lc,Cat. No. 1E35501 o MM5330 41/4 Digit RUM 4.95 BARREL KIT :205 8030C Volt Control Om 4.95 BARREL KIT :203 BARREL KIT :201 BARREL KIT 2200 (0-- BARREL KIT 4.185 MINI BLOCK It 02376 Encoder ROM BCD CALCULATOR 9399 BV INDICATORS 6 DIGIT PC BOARDS ,v (3 95119013C 350 MHz eece! a CAPACITORS / 8.88 KEYBOARDS 2%1 w/leads READOUT ¡ MC14410 Touch Tone Encoder 9.95 400 PARTS r --51 0 MODULES u..._ qq I 50 for $1.98 / MK2002R Char, Gen, 12513 equal) 3.95 10 for $1.98 °'4 15 for 8 Unbelievable! Worth $50. $f 5 for $1.98 Computer maker',dumps 072070/7208 Frequency C , pair ....29.95 IL's true! 20-1.ey, 4 tune Tent lamp manufacturer Barrels and barrels and no 10.10.'ní Pr nn:,rdn loaded" lOglt n :cano ,ubmo: ICM7107 31/2 DIRit DPM Worth 12.50 lion keyboards at ridieu damps owea.orn, timr 'o trat. Cnlculnlor nnA with IC's, . C ato's,u diodes, ear. for all appNeatonx, r) MM5316 Alarm lour -away. WI. 69e en. Clock 2.95 live 12 on Like Rnon-o-cheat. drivvr hip. henehll, po.y Inn^n Rawl, , \\'t. :1 ow, No. 1E3528 011080A Microprocessor 14.95 Cat. No. 1E3524 Cat. No. 1E3526 .n bark. \Yt. r: .r. 1(3515 \l'121M' No. íE3386 0 1702A Erasable PROM 4.95 BARREL KIT :184 2708 OhEPROM 22,88 BARREL KIT BARREL KIT ;181 BARREL KIT 141,, to :182 BARREL KIT 2177 :163 -WATT METAL FILM 02302.1 IK RAM 1,39 JUMBO RED LEDS MICRO ZENERS LED DRIVER ICS MINI TRIM POTS 11C9013C 650 MHz Prescaler . 14.95 30and 150 for$1.98_41/j.a- 0 15 for ,100 for $1.98 n 1.98 7e ID 682376.139 BCD Encoder ROM 6.95 $1.98 30 for $n .98 fl .e Popular, 1000 projects, 1 -Watt, tiny. 100Có - hie C KR2376-5T ASCII Encoder ROM 14.95 100 material. user con. m ITT eraio f il.19l ono Abel. values eeuuse0lon m y fi, rte. FroExcellentdumps rod. from 25' to 30V, ' Into MM5369 60Ha Time Base 1.95 eí11, Iro.1 factory A.inl 2r. for driving MUltiple lapproiin because factory barrel! :cads, So 11,0,1,. Excellent oast. of 3.579MHz Time Base /Dal 1.95 dumps' 11V 10 mill. For uUes,, LEDs. Clocks, cnlcuiaturx, con tinned Ilse R barreled metal film DD -7 h y 1.l 1111,0. 100'2 rea x- 0 1.00MHz Touch Tone Mal , . . 5.95 l all'. 1,r ord en o. red lens. boxen -en untested, What n bus (,n I5 ors. Lon, leads 1E3413 C.I. No. 'IE3368 aaaaaaaaaaaaaaaaaaaReReRasa Cat. No. 1E3369 .xcellenl yield. 1E3360 turn. 'A \V, .. ,. 1E3395 BARREL KIT :160 'TBARREL KIT 215BARREL KIT 2158 BARREL KIT :149 BARREL KIT :145 'HOBBY VOLTAGE I, MODULAR SWITCHES ¡MAGNIFIED MAN -3.5 ROCKER SWITCHES. MINI I OF F 'REGULATORS 25 for "r' 20 for $1.98 , 800 25 0/ TRANSFORMER -2' 12 10 for $1,98 r $1,98 ' fhnrlr.' Fa ,IAN-: for $1.98 15 for $1.98 I,\I. 109E TO -:1 1,r' In ,barreled .h -ON' n ...ado...... aril., on g - ., 9-0' 15% OFF \¡,mature transformer I.,rs 1,y the haves b, .panda not "IV, then. TV -makers en- n ',h1, Barrel. 'n borreln. so one, a We know We Order be Ca t No. 1E1981 agar... ,\.t ,I mo,, mr to 'her.cheek Cn1E3330,7 Your . 0181t. eNo. e. itr:.nd Eno..r I'1, a ,..I, t g,r(m,.nI shoulds getC the lowest pr'Ce5! J 6 Te e No tag, and amlm, Dal, I" gale. No. m s. Cat. No. MI mid,- en 2 ,í1E3150 1E3325 Owl.r deal. No.re 1E3303 í 5N7464 .14 0 SN74148 1.259 III ib` 1(3294 BARREL BARREL KIT Trw Sale BARREL KIT :144 BARREL KIT :138 tes, KIT :135 :l28 SN741.Y 5874154 .99$ BARREL KIT 1127 MICRO MINI MINI -DIP IC'S 587400 10.14 .26 0 RCA PHONO PLUGS PANEL SWITCHE' LAMPS 180114490.03? 1 SN741 ss .78 AXIAL ELECTROS :14 0 SN]473 ,31 40 for $1,98 20 for 100 for $1.98 SN7403 SN]474 -31 0 5874156 .88= 40 for $1,98 30 for $1.98 0587404 ,16 SN7475 ,4B SN741S7 1 ,nnn.nOn iii' I Phone p,. en 0 Thitnfully !1,r (arteries ,1,Y $1,96 r_9 : 11's, 1,3I.I.0, :r11 :en: -170587476 .33 5N74180 .B9 for II.. one You h,-Iia r. bid you hear of I Os. In. ,k..., 1': non-. Neu, LI n n f'r'ets! ,Io uu .vl,u' . ,r: :0587404SH]405 .l8 SN74]B ,79 5874161 .87 ' barrelled - tell bed, C Ii«1,11 \YL'T A othercorp.maker on -ano., Infra n osed. led. Untested _ 5)47408 19 SN7483 .89 5N]4í63 .BT 'Isyo, 104r Look ni peo.. darlmatons, photo 4 BUY! Asst. ra-1E32a and I :ml loath, IV., I Ih. a05N7410 ,14 0 587488 -88 ,95 the price. No. lE 3293 tray, slb-, eft.. 1E3268 tors No, 1E3262 4 I 05N74í84 roliacen. No. íE3227 trans, Cat. No 1(3245 a 0 587411 .39 0 587486 29 0 5574165 ,55 55745] 0 5874186 5.15 BARREL KIT :126 BARREL KIT 2115 BARREL BARREL .0 39 Sr174Be 2.95 KIT 2112 KIT:109 0587417 .24 587490 63058741731,99 SQUARE OHMS, UPRIGHT ELECTROS MOLEX SOCKET, MICRO MINI LEDS TERMINAL STRIPS a055í41] 0 5117491 ,63 005:]41)4 -93 SQUARE OHMS SN]420 ,14 0 SN7492 ,45 5874175 40 for $1.98 150 " 40 100 for 60 ' for lot $ .2610 for $1.9 I wade roam 0 ::::173 5.7493 ,45 587417] 7> ue,d. of `.Ise, actorY n me- ¡. $1.98 $1.9898 $1.98 .2610 5117494 69 0 5874179 1.49 People In ,. , ', Im to 2nnmf mishit, All 1,e my leas, , I, us ...t. 1 ..I ran limes ...7.,ee" when the) b We 0 587430 .14 5 7 95 .69 0 5874180 .69 f maker Muni': 1111 1 collagen. Inn^n marked Calculator right,el1,r o ll.,.nis from r t I e 1 me xriuere ohm SN7432 ,2410 1.95 Z PPP Pr \\'h barreled. a zillion 1 Used 5.7496 89 0 5N74181 Y '.m. Yield 609 or.better. n mI em ,It m n barrels Asst - good..alt I 5:)037 .240 5147498 .69 58]4183 .69 iz Cat. No. 1E3226 4 ors, for IC sockets. 1E3146 Geri No. /(3139 h:rrel Mimi 1E3136 s, 0 587438 .24'0 5874307 2910 5N74190 1.15 `'+'Luca lx. IE]096 5N7440 .14 51474112 ' BARREL KIT 1104 BARREL KIT 2101 BARREL KIT 899 0 .18`0 5874191 ,99 BARREL KIT 193 0 587441 79 0 5.74121 .31,L0 58]4192 .83 BARREL KIT ;87 SLIDE VOLUME RESISTOR SPECIAI PHOTO ELECTRIC H ALF WATTERS. SN7a42 .49 NATIONAL IC /{ SN741 z3 .a9 M1M1M1777777 58]4193 .B3 Trp`e CONTROLS CELLSELLS100 for SN7445 .69 0 SN74I94 ,13.0 BONANZA! 'TT" rrr`tgt;¡¡-' 200 for /%! 200 for , 0 5N74í25 .39 0 ¡l J or. $0 557450 14 0 58)4126 ,3910 SNT4195 .75 10 Olor $í.9R IEcB60 15 for $1.98 $1.98 $1.98 1E3046 4 and can tented, $1.98 , 587451 ,14 0 5874132 .83 0 5)474197 .75 y factory teed in hi-n volume con. Asst. GE types. CDS types. Resistor factory tried .' SN]453 .14 ml.aeA fn hnrrele, Linear., Asst. In 0 SNT41 a0 1.00 5874199 1.69 makeraker unloads. Includes: !'a , I. 2- Mixed by factory. Rig job ore ha nosing I.II 4 5N7454 ,1410 5)474141 .92 5874200 5.50' 7100's, RO.\IC, DTL C, rea- values, what a hue. Worth walters, carbon. i M for u. separate. loon c'mlor -coded resistor` in 1....:=1....1.1111,7,6 145 .89 0 5874251 1.19 `'ros cluck and ealruln,.r 51 ea. 1E3057 Inn : eel, 1E3054 barn... But value here, chm..,nd more. \I't. 12 .x I Cat. No, 1E3052 BARREL KIT 286 ARREL KIT 283 'BARREL KIT :81 BARREL KIT .176 BARREL KIT :7 BARREL KIT :71 BARREL KIT 068 HOBBY LEDS LM -340T VOLTAGE SUBMINI RESISTORS 1.WATT 2ENER5/ TRANSISTOR CAPACITOR SPECIAL 2 WATTS ¡ REGULATORS 100 ELECTROS ' 100 pCS. 100 for 40 10, 11.98 IS for $1,98 200 for for 11'OW: maker $1,98 50 for $1.98 $1.98 ^ Tn, U.S.A, ,.der b, hhyn me - $1.98 I hu... "1,Y ,he car. 100Có $1.98 das1 r ho sin, . tIfle: 1 1! type, color cod. dunk. nodoo n,.^.+'t 1 . include uproal,t rwoory »mar. won., dump , n barrel. Ern,«ds s., ninny nuppherk unl,y and uO,nn ed. TI.e- I -. I n, . ' don't ,011 barrel- but Duos 'eelthe l s. ofn, ii, . yiehl r: or heeler, us , barrel.. t. gol mine, "Me 110 evil., TD -2'2012ímoverI n s. 10. 12. I ,V. under ale s soilage. :due molded, .e.1 . bunn It's li9 \\'t f ern. No, 1E2859 _.r \1't. 4 ors, IE2635 Cat, No. 1E2746 class, Double Ping, - 1E2741 to .100 ml 1(2747 ceramics ,^endape. 1E273 8 All 'harked. 1E27:51 ' BARREL KIT :62 ' - BARREL KIT 261 BARREL KIT :58 BARREL KIT :56 BARREL KIT 25 BARREL KIT :40. BARREL KIT 239 ' MIXED IC'S POLYSTYRENE CAPS SLIDE SWITCHES POWERS! POWERS! 6 6 8 DIGIT HOBBY PNP HOBBY NPN llD$1.98for 25 for 100 READOUTS POWER 15 for POWER '. 100 for _41.--M- for OW TRANSISTORS $1.98 1E2726Á 6is 10 for $1.98 TRANSISTORS ' An 7400's. known. $1...18,, 51.98 $1.98 Bargain f a Itfetime, We Popular yne., mode. Ana cam - e,'rm:tnmm nod nili- 15 for $1.98 s, ,.or,HASIB. ROh18, RTL' All Large ''¡oast .1 p1, barrel of but e, .n^t',.,u,r,t. ,II ,.r ,r, a em, no r TO -:r1, factory 'nn- Facto y (annuls and 'o0 bla ab.ught 10 borrele o o. rnte.l edand DTI louden M all kip,, tree, leerory, m,xed values: toMorlolexed,lest. ,nd fallouts, Inns, spec'' TO -3 posers. 100% what n mix. Robby and un- ,l ukCf.'r 1 óÓs .1 : sail.. h hhy. hllsdor h.ohh-, _,.i good. IE2]29 ss t no cottons. .shorts! hobby. o opens. noshort,. Mrl.nR' projects W. n . .l«d \\I. 12 no 1E2730 Cat` No. 1E2724 ...oh a 1E2722 Wt. 111 or, No, n' 1E2618 I lb. No. 1E2017 B BARREL KIT 231 BARREL KIT BARREL KIT :27 MAD0.U BARREL KIT :36 ARREL KIT:35 230{ DIODES NEON LAMPS RRELIC PREFORMED ,..4111371 PREFORMED DISCS S =a. ~ GERMANIUM RESISTORS RESISTOR. Y_ 200 for$1.98Umente 30 for $1.98' 100 for $1.98 200 for $1.98 150 for $1.98 .: F maser. omoonier .fasts sOy by' a.. a burr, odd , -a, I l r Id, Btu ,,,,u. NE2's /*II sap.. Nm tow, e. or ns,. tee. n. Pr um.. In1', mfr' shelf In ,ry nut factory made millions . I lan' ,. Ise war he RI:- You'll get e,.1, but , Mum ell« en har- end 'ern. TESTERSni huy 'eat from the 6:,, rel',A tni, K a barrel of 100 ,. 100 , sutlers. rel.. Preformed, fur Pt' use. aR,W_.-"KKt,_:rr4, A O lE 2613 aa fact ,. I.1,. 1E2614 , loen, Si,.a«,I values to. 1E26ó6 11ra 1 eCoa !aM la 1E2609 tat. No. 1E2608 _IT. l_ BARREL MIT 226 BARREL KIT :25 BARREL KIT 819 BARREL KIT 217 BARREL KIT 114 ='a, - PLASTIC METAL CAN DIPPED MYLARS_ LINEARS AND PRECISION RESISTORS _r-r_ TRANSISTORS TRANSISTORS INOrh. 7400's DIPS 100 for $1,98 100 for $1.98 1E2603 60 for 100 for $1.98 200 for 1 memo,. arm by Dandy. Vol.,. ,,,lead, barrels of $1.98 Untested and l,.hh,. from $1.98 hobby and untested do t.,t.rr to you. Bladed and hlorke,/ a 2N number, asst. manufar. TO l:. T0-1. and n I, el In unmarked,its inter - Till I 2 ,sans. \Y,. 9 Marked un- n iris. 1. u mbr r s Nt. IN on., and 1E2428 Catar No, W.,transistor, No. lE 2604 marked. 211 , . Cat. No. 1E 2597 Cat. 1E2431 rah BARREL KIT =11 [BARREL KIT $10 BARREL KIT e7 BARREL KIT 85 BARREL KIT 14 POWER TAB RO MS -REGISTERS VOLUME CONTROL SCRS, TRIACS, "4000" RECTIFIERSy TRANSISTORS 75 for ARV BONANZA¡ r. QUADRACS 100 for $1.98iVr 40 for ^h.. ih,. ,. , $1.98 30 for 40 for $1.98 uÓ«s 1'miln. $1.98 ``ylñ ,.II d Immune Boldly and unte pow- ` 1 NPN, Plastic TO220 in,, te,L m arked $1.98 .. nlnstut I?^,00ñ' O,,ea - .ml Internal nu.here, fr.frontHi.tlri duals, variety of b tem.. Ras fill.ry ,.i,nle inn. Send for your FREE Assorted 210 numbers. :Angles. 2- 000 '00 .11 4lur tlk:.\II the 10 and ty1,es, pins \\'u1 a buy': sal e styles. big ones - 400, Cop.w.3 0 and 1000 No. íE2425 Untested. s.. email n, . Cat.Ca No, 1E24191 n1e.led Cat. No. 1E2417 POLY PAKS CATALOG No. 1 E 2424 1E2421 Toltec., BARREL KIT : 3,401C) -- BARREL KIT :2 BARREL KIT 81 ms: Add postage Rated: net 30 1N9148/914.,..., LINEAR OP s_ WORLD'S AMPS SN7400 DIP IC'S alone : Wakefield, Mass. (617) 245-3829 FEATURING THE SWITCHING DIODES DIPS .. 75 for 75 for $1.98 9999I111 Retail: 16-18 fiel Carmine St.. Wakefield. 100 for $1.98 Marked 1 f and 11: pin don, MAY t'nt,.,ll.0 51.98 hoot., say nelmle Clue., p1,- MINIMUM ORDER -$6.00 s Too never this before May Include 709x, : I1 's, I , e. g.,1, BE BARGAINS In fe, owée sin, Im, BEST :ea., 6110 seCí . 555 In. nib. limner.? nCuari re d PHONED nom. a Deeseneo n: POLY IN ELECTRONICS eludo. marked and on - :, Inlaetin CntenleJ.nhnh. Gn.esle,I. No. 1E2418 sparked. Cat. No. IE 2416 hy. Wt. 11 oso. 1E2415 PA K P.O. BOX 942E LYNNFIELD, MA.019400 ©Poly Paks ¡1,c Wakefield, Mass., U.S.A. 1977 CIRCLE NO. 37 ON FREE INFORMATION CARO JANUARY 1978 99 AmericanRadioHistory.Com 888NO - em 88 II HI 88 88 88rN - N¢wECO! RAM VI'M ECONORAM I --_.nii 12Kx8 memory kit Operation Assist for the Heath H8 If you need information on outdated or rare 0. - 1' equipment -a schematic, parts list. etc. -another reader might be able to assist. Simply send a postcard to Opera. 1 tion POPULAR $235.00 Assist. ELECTRONICS. 1 Park Ave.. New York. We proudly welcome our newest memory - NY 10016. For those who can help readers, please re- board family member. designed from the - spond directly to them. They'll appreciate it. (Only those ground up for full compatibility with the Heath items regarding equipment not available from normal Company H8. Organized as two independent sources are published.) blocks, one 8K block and one 4K. Has the Popular 8K x 8 memory plugs into Altair, I same basic features as our ECONORAM IMSAI,other 5.100 machines. Two indepen- I I74 -all static design, switch selected protect dent 4K blocks with separate protect and vec- and phantom, sockets for all ICs, full buffer- for interrupt provision If you try to write into I.T.T. Model 1735D oscilloscope. Schematics or informa- ing-plus the required hardware and edge protected memory. Handles DMA devices. tion for power supply. Allen Currey, 330 Scott Dr., Silver 9 connector to mate mechanically with the H8. Fully buffered. Tri-state outputs. Selectable Spring, MD 20904. You can have our 12K board for the price of write strobe. Sockets for all ICs. Join the ` I o l the Heath Company's 8K ... with the per. thousands who have made this our most - - formance you've come to expect from pro. popular board! BAK TV Analyst Model 1075. Manual and/or schematic. ducts carrying the ECONORAMTM name. Kit form 5130: assembled, tested war- Harry Matosian, 14035 Hartsook St., Sherman Oaks, CA 91423. ranted for 1 year $150; SPECIAL - Four - ISelected computer kits ECONORAM IITM kits $475 (32K of memory) Hallicrafter S -38C shortwave receiver. Schematic or any 5124) 10 SLOT MOTHERBOARD ($90: 18 SLOTS These S-100 available information. Mark Stefanlk, 20 Old Farm Rd., Ce- motherboards come with edge connectors and active termination cir. dar Knolls, NJ 07927. cuitry. IECONORAM IIITM- - ACTIVE TERMINATOR (529.50) Plugs into S-100 buss mother- REK-o-KUT Model R-34 manual turntable. Need drive belt. boards lacking active termination: cleans up the glitches associated with I'. ., IN - Arthur C. McReynolds, 1841 Isabella Ave., Monterey Park, unterminated lines. CA 91754. ! I =.131" 12 Volt, 8 Ámp Power Rows Scientist PR calculator. Need Programs. E.C. Fante, 3085 Adams Way, Santa Clara, CA 95051. Supply Kit Jefferson -Travis Radio Model 350-A-1. Schematics and The first 8K x 8 dynamic RAM that per- any other information. Richard Harris, Box 518, Chase City, $44.50 brings you crowbar over. forms well enough to merit the ECONO. VA voltage protection, current limiting, out. d RAMTMname. Not a kit- assembled- tested. 23924. put protection, and easy assembly. Use 'x ready to run In your S-100 machine. (Altair with ham. CB. automotive equipment etc.). Low power. Configuration as 2 separate Philco Standard shortwave radio Model 19A, Code 121. when you need hefty AC power. Less ° 4K blocks. Zero wall states with 8080 CPU. Schematic. R. Mills, 46 Harts Lane, Guelph, Ontario, CAN. case, hardware. - Includes 1 year warranty 5149.00 - - Sherwood SA -5200 tube -type stereo amplifier. Schematic. TERMS: Please allow up to 5% for shipping: (10% for 12V supp Fred Avery, Box 5883, Raleigh, NC 27607. ly): excess refunded. Cal res add tan. COD orders OK with street address for UPS. VISA" /Mastercharge" orders call (415) 562-0636.24 hours. Pioneer Model SX-82 stereo receiver. Schematic and serv- oD 00 ice manual. Eric Archer, 3402 Community Ave., Glendale, - FREE FLYER: We carry many items of interest to all elec- - CA 91214. - BILL GODBOUT ELECTRONICS tronic hobbyists. Send us your name and address. we'll 2355. OAKLAND AIRPORT. CA 94614 oIItBOX send you our current flyer. Masco Commercial PA amplifier Model MA60. Operator's I'll manual and schematic. Van Lynn Floyd, R.R. #1, Box 94, _ CIRCLE NO 16 ON FREE INFORMATION CARO Johnson, KS 67855. DISCOUNT ON ALL LINEAR CIRCUITS Hallicrafter Model S40A. Prints and documentation. Rich- LM30011 5 71 11.1372N 2 93 L74733H 79 ard Fumari, 33 Highland Ave., Yonkers, NY 10705. E IC'S AND LED'S LM301CN 29 LM376CN 59 L.17391199 1143020 .85 1143801.1 1 29 1.1.17,11CHiSi 32 1007o 0430414 U OFF ON $25.00 80 L11300-BCN 95 LM,41CN1141 32 LM3o1cN International 1000 Executive CB transceiver and exter- 15% OFF ON $50.00 .26 043810 I 75 0,41CH 35 LM307N .30 nal speakers meter. Schematics and service manual. Larry 043825 1 ;s LM74711 79 2708 0A30111110911 89 043858 s LM747N 71 R. Jewell, 223 Cedar Springs Rd., Spartanburg, SC 29302. 531416 DIGIT L1.43 1 OS E5310 2 90 L 74dC5 35 ¡PULL SPEED EROM LM3091L 99 CLOCK CHIP NE 540L 2 90 ; 80 For LM310cN I 0 NE 548A I Hantmarlund Super -Pro Model ASP 779 shortwave re- $14.0 09 LIA1 140 9 31iCN 89 NE SSOA i2 '!w, 75 456CN 1 29 ceiver. Schematic, parts list, service and operator's manual. LM311N 89 LM5S5CN I 2.10.2. 39 '458CN 59 Nelson Allan, Box 164, New NY 13413. 74S200 0431 IN 89 E556A Hartford, 500NS I K 85 49614 89 RAM 3 LM560N 2 95 LMI800N 2 48 256 BIT RAM ,,"'.3.Z1AM131,,"'.3.Z9N $1.29 5610 2.95 U1N2208 B9 faster Feiden (Singer) Model EC1114, 14 digit desk. calculator. TRI-STATE s.52.12.1s , 29 LM565N 19 u1522o9 89 Schematic or service manual. Robert Miller, Rt. 1, Anadarke, 11456511 1 39 8080A 8008 CA3046 1 19 L 5 12157 19 045860 139 149 OK 73005. 1.4132214 59 1 I LM566CN 14 LM81J90oN 49 $16.95 DART 11.432rN LM587CN 1 29 147524 79 iLLM2902Ni , 52 56714 9 service Dumont Model 208 oscilloscope. Schematic and service ILD110, LD111 AY51013A 1147525 79 3395 55 11470314 59 315 DIGIT 80388 4 59 manual. Alex P. Cameron, Rt. 3 Box 93, Samson, AL 36477. 4,000sá ER TER 1M340x $6.95 LM703CN .39 451CN 35 SET 047091.1 25 75452CN 35 $24.75 15.18.24 Model i.2513 29 0470911 29 75453CN 35 Tektonlx, Inc. S-32 Serviscope oscilloscope. Otto LM340r 82S23 CHARACTER GEN L4210N 59 75454CN 35 R. Jans, 400 Grove St., Ridgewood, NJ 07450. 256 1411 I N 39 754910 BIT PROM 64 x Sx 5 ASCII 15.18.24 1.1472311 55 754920 85 $2.95 $8.95 Iraa--E9wr li 19 0472314 52 Heathklt Oscilloscope 10-21. Schematic. R.L. Conhalm, 1329 Stanley Ave., Dayton, OH 45404. 06320 115 n712567 1.99 10142,2 1.75 0E82555 4.75 USE CERAMIC CAPACITORS sov 852208 295 í04,36 1 75 054739 , 15 NE828113 , 75 0-10 952207 2.95 854202 1 75 5.11 ea Ferantl 3 Bend, 220-V ac -dc, 6 -tube receiver. Model # un- 10-100 5.05 ea known. Schematic, company address. Stephen Ostrom, ELECTRONIC DOOR CHIME KIT lpf 56pf 270pf .001uf ZIP 2167 Beaumont Rd., Ottowa, Ontario, CAN KIH 5V2. 5pf 68pf 390pf .0047uf WITH TI TMS 1000 7pf 82pf 470pf .Oluf MICROPROCESSOR CHIP Seebtry Selecto-matic 100 Model M 100-B, Ser. 5830. lOpf 100pf 600pf .01uf/1KV PROGRAMMED TO PLAY Seebury Wall-o-matic 100 Model 3W-1, Ser. 10203. Serv- 22pf 12opf 820pf .022uf 24 DIFFERENT TUNES ice manuals and sources. Rod Stebelton, 6155 Coonpath 27pf 15opf .030uf CODE Rd, Carroll, OH 43122. 33pf 18opf .050uf 111001110N PI 1110111. 47Pf 220pf Harvey Wells Model TBS-50 Amateur Transmitter. Own- .1uf er's manual and schematic. Patrick W. Keogh, 1404 So. 87th IC SOCKETS St., West Allis, WI 53214. Solder Toll low profile pin 24 pin .42 S .17 Grand 5 -Brand Radio, Model FP -1211-G. Dial string in- 14 pin 20 pin .59 on 2, struction and diagram. Bernard Grupe, 3012 Highland Dr., 16 pin .22 40 pin .69 Gary, IL 60013. IS pin .29 $39.50 SHIPPING SI.Ou Satisfaction guaranteed. Shipment will he made postage prepaid within 3 days I ram °onset Communicator 2, 2 -meter VFO, VHF Amp Model receipt of order. Payment may be made with personal check, charge card (include all 3063. Manuals. Richard Dawson, 1308 F. St., The Dalles, number and exp. date), or money order. Phone Orders - BofA and M/C card or C.O.D FREE CATALOG AVAILABLE ON REQUEST OR 97058 Add St.00 to corer shipping and handling if order is less than 510.00. Vernon 47/26 Tape Recorder. Schematic. James L. Ne- California residents add sales tax. Include shipping expense for orders shipped out of mail gron, Box 162, Sandy Spring, MD 20860. U.S. and Canada approx. Kr, of order. INTERNATIONAL ELECTRONICS UNLIMITED General Electric sweep generator Model ST -4A, Gener- VILLAGE SQUARE, P.O. BOX 449, CARMEL VALLEY, CA 93924 USA al Electric marker generator St -5A. Schematic, operating TELEPHONE 408 659-3171 POPULAR ELECTRONICS CIRCLE N0. 21 ON FREE INFORMATION CARD AmericanRadioHistory.Com ACOUSTIC COUPLER BY NOV STION This originate only coupler 1' was manufactured for use ABOUT YOUR SUBSCRIPTION in T.I. 725 data terminal. r II is compatible with (fell 103 and 113 data sets or Your to POPULAR ELECTRONICS is maintained the world's most modern, effi- the equivalent. The coupler subscription on one of m operates asynchronously to cient computer systems, and if you're like 99% of our subscribers, you'll never have any reason to a maximum speed of 300 complain about your subscription service. baud in the full or half duplex I, - mode. All signal outputs are coil- - We have found that when complaints do arise, the majority of them occur because people have writ- n patible with TTL. Transmit freq. is 1270h1z. for mark ten names addresses at For if your were listed and 10701áz. for space. Receive freq. is 2225hz. for their or differently different times. example, subscription mark and 2025hz. for space. Unit requires +-12 volts under "William Jones, Cedar Lane, Middletown, Arizona," and you were to renew it as "Bill Jones, Ce- 114 and +5 volts for operation. Complete with schematic dar Lane. Middletown, Arizona." our computer would think that two separate subscriptions were in- and all pertinent information. Fully reconditioned, calibrated, and guaranteed. volved, and it would start sending you two copies of POPULAR ELECTRONICS each month. Other exam- ples of combinations of names that would confuse the computer would include: John Henry Smith and SPECIAL OFFER! LOOK.! Henry Smith; and Mrs. Joseph Jones and Mary Jones. Minor differences in addresses can also lead to NEWT GREEN INSERT, DB>1-25-S CONNECTOR SALE! SOLDER'CUP PINS. difficulties. For example, to the computer, 100 Second St. is not the same as 100 2nd St. ~'''Zes r ONLY 53.50 EACH So, please, when you write us about your subscription, be sure to enclose the mailing label from the í;r11 10 FOR 532.50 cover of the magazine -or else copy your name and address exactly as they appear on the mailing NEW, "AA" EVEREADY 10.3 HEATSINK label. This will greatly reduce any chance of error, and we will be able to service your request much BATTERY 600.1.25Ablaek ° more Stock -up on chit super anodized alum. quickly. s ovens. ONLY S.25ea. eirf1 011.81"base 10 for 52.00 e li11181A 1.25"high.51.25`' 1- 10 for 59.95 TIIE PITTMAN 12V IC MOTOR runsasn ,low as 2 colts, rat el 12 ,ills 250ma with P.O. Box 4430C Santa Clara, CA 95054 2.8 i1 us. of tort' ,e at 5000/11'M. Id/8" - (408) 988-1640 51.95ca. ilia. x 2" long o tI 0.118" draft. 10/015. ` Same day shipment. First line parts only. Factory SPRAGUE 36D POWERLYTICS tested. Guaranteed money back: Quality IC's and other components at factory prices. LIKE NEW PARTS AT USED PRICES! PULLED FROM NEW EQUIPMENT AND OFFERED TO YOU INTEGRATED CIRCUITS AT SUBSTANTIAL SAVINGS. AVAILABLE IN: ca0u 21 6114013 74 5 ¢s1 5500MFD 0 40V 8200MFD P 25V N m 741138.4 us MN' 6111013 ié 74n0 17 YOUR CHOICE 51.00 EA. 10 FOR 57.95 741.574N is C040t4 295 ELECTRONICS ) SW co.pls 74C73 75 r4raDaX IV 7ll$B1X 51 nW EAGLE-PIC capea 36 74cre 511.45314 ER BATTERY 7409N 23 741.99311 n fo c% 1 % e9 I;so 140 r CDeonfi CF6V5, 6 VOLT 5A.11. SPILL -PROOF- RE - Calcan i1 c15E 100 as5,e 999 RESISTORSN sin Sw SPECIAL PRODUCTS raásox" LsiirNi 15 .xe M 5tt9 1,Ip OMr4M N Imp«IYw.On sloo.n4rlim« I W º% CI ARGEABLE BATTERY. 512.50EA. 10/599.95. 1711 39 7415113N ss o: r4Cl9r 140 assist IOW ]SMrryMO}5 ]sariswau VtswrO ?St NEW -1 YEAR WARRANTY. raen 1 on 741513211 n ¡ill ; 35 5s 004093 :,6X 69 11L5151X 67 cM41174 BEST SELLERS! MEIN W r unsw u G4as urea 69 7415151N St rt KYNAR WIRE WRAP WIRE. Solid silver plated 304WG N4Wfi IWX .17 7415162N .91 º CD4Wt available in blue, red, yellow, black, Green, or while. 19 )aL5161H .91 1.10 Ga0}e r47w .49 741.517411 95 cD4W9 100'sponl for 52.50; 500'spool for 55.95; 1000'spool aSSx a NLSIWN 6D4010 IR 1390 }00 741512I14 % for 59.95. CD401s 6] mo ° n1n int 7.11 43 calao MYNS1 b }.50 p L55Ó67N 16 r+esn á4p1 ye4oe 3umop s+n bn v 1 wmw tt win 26AWG red or black »VA4371 CD4ar n]al es 10 SOCRrT6 7 4%0 Cnrm41N Moennnp clMe S51 5trs%Ae4 apn ` NEAR 1.50 8) r M9HY CaaJ eae 65 ,T3, In 500'spool for 57.95; 1000'spool for 512.50 A9 GYMS lW Cala4 Ir twewree.,mM,ornn.Mrp..w,4 MnW .e9rEx 2.95 I. 5 N n7P]Tnx401m« ung WaA edo413 Re 4W Me 15 2I 36 C5Ys11ieIS r.n 74111711 1 50 06449 1% 6i1 ]00 e 1.1 ,00ra00Yxl 1eMAtOtO.CprF.N'11 aW.eaB9 N % 2 4 2 a7n2 SINE 7.75 1nM lrwprmer 5 rSiiiX 6l% 10 5 5 60117. MINI KIT CÓ4Ó59 }) vg le 17 0 fi1 4 Wen7 415I+Sle4x, 7WSpe4,Ib,n,lO,mrt,nar 1412511 SECIAL OFFER ON 60ÁZ. 7414sN ÓÓaÓ656 I rr 11$"1.21' On 1ó M1Ir a is s Ó66 ú i 50 2.º5Nr 7tt50N }89 1eX:5 CD0066 .a0 alt , Pm t5 1n..+.:.u lP"15 IeMis SW 5115Mx1 5011W1 74111,14 90 1.10 GD4006 50 pr0esn si 43/86 PIN DUAL READ-OUT, .156 SPACING. Lnwr8 ÓaOpr 11 US. unesW le so wopi 0m su s1A5 C4JV; 1.10 9ó báam 41 IYI O[ asas D1Gnl sN)./S WITH SOLDER EYELET PINS. USED, BUT r4Lüi6 rs LMi1T:15 i:i1 ]a 1W i9 2.% pERMOMn[R ú.5o 5°`I'O" 1k1Y 154 95 .41 }71A 4t rlta,,nr 5 ex M340L16 CO,008 11 ram n MSÓIi W&n O Gsmra ouroM4 9r meaul S4 YOU WILL LOVE THEM AT $1.00 EACH. ,í530x .r5 lM1OL24 i:10p 1e5p ,r0043 12' -nos Prau,mEóvñ`Mirsérir 533N a 50 14CWi'p 11 .l9 LMN3x can Ó 3t aMMM5n1 360 a p mnwe soü. scuim Como stir m wr6wnwt, BMuln6u4 11005-111' WIRE Stranded 22 GA. available in white, brown. orange. red. 31/2 Digit Multimeter $49.95 60 Hz black, blue. purple. yellow. green, or gray. Crystal Time Base Paratronics 100A Logic Batt. oper. 1 mV and .1 NA resolution. Re- De 200 FT. SPOOL ¢150 Kit S4.75 Converts digital clocks Analyzer Kit $199.00 ,1 sistance to 20 meg. 1% accuracy. Small, from AC line frequency to crystal time MINIMUM ORDER 510 SEND FOR FREE CATALOG Converts an oscilloscope Into a digital portable, completely.assem. in case. 1 base. Outstanding accuracy. Kit includes: tester and analyzer. Trace computer pro- TERMS: Send check or money order. NO COD. Texas year guarantee. PC board, MM5369, crystal, resistors, gram flow, monitor I/O sequences, etc. residents add 5% sales tax. Canada and Mexico add capacitors and trimmer. 52.50. Overseas countries add 65.00 for surface rates. Trouble shoot all digital, CMOS and MOS We pay postage up to 10 pounds. Not a Cheap Clock Kit $14.95 families. 128 bit truth table 18 by 16 bits). New 14ELFtr Includes everything except case. 2 -PC Cosmac Super Complete with case, parts and instructs. ditilACE ELECTRONIC PARTS RCA CMOS expandable microcomputer MITCHELLDALE 6-8 boards. 6-.50" LED Displays. 5314 clock Model 10 Trigger Expander Kit expands 5400 nerwe w/HEX keypad Input and video cutout for HOUSTON, TEXAS 77092 chip, transformer, all components and Model 100A to 24 bits $229.00. Model alts graphics. Just turn an and start loading (713) 688-8114 full instructions. Same clock kit with .80" 150 Bus Grabber Kit S369.00, a one CZ your program using the resident monitor ,M displays. $21.95 board logic analyzer for S-100 bus appli- J. ROM. Pushbutton - on selection of all four cations. Instant access to 56 S-100 bus CPU modes. LED indicators of current signals. Complete kit with all parts and CIRCLE 110. 2 ON FREE INFORMATION CARD Digital Temperature Meter Kit CPU mode and four CPU states. Single Indoor and Automatically instructs. outdoor. step op. for program debug. But in pwr. switches back and forth. Beautiful. 50" manuals. Richard Roggeveen, 5569 Dunsburry Ct., San supply, 256 Bytes of JAM, audio amp. 8 LED readouts. Nothing like it available. 2.5 MHz Frequency Counter Jose, CA 95123. spkr. Detailed assy. nan. w/PC board 8 Needs no additional parts for complete, kit less case S37.50 all parts. Comp. Kit Kit Complete full operation. Will measure -100° to 5106.95 Custom Knight Model 150 transmitter and R-99 receiver. Operating +200°F, air or liquid. Very accurate. hardwood cab.; drilled front pauel 19.75 30 MHz Frequency Counter Nicad Battery Backup Kit parts manual and schematic. Mike Libonati, 100 Sullivan St., New Complete instructions. $39.95' w/all 4.95 Kit Complete kit less case $47.75 - York, NY 10012. Fully wired and tested in cabinet 151.70 Prescaler Kit to 250 MHz $19.95 1802 software xchng. club; write for info. Clock Calendar Kit $19.95 ' Stopwatch Kit $26.95 Heathklt Model W-2 power amplifier. Need output trans- C17015 direct drive chip displays date RCA Cosmac VIP Kit 275.00 Full six digit battery operated. 2-5 volts. former. John Million, 1115 Barkley Rd., Charlotte, NC 28109. and time on .6° LEDS with AM -PM indi- Video computer with lames and graphics. 3.2768 MHz crystal accuracy. Times to cator. Alarm/doze feature includes buz- 59 min., 59 sec., 991/100 sec. Times std., Paco Model S-55 oscilloscope. Schematic and operating zer. Complete with all parts, power supply split and Taylor. 7205 chip, all compo- manual. Ed Palmer, #26-67 Angus Rd., Regina, Sask, CAN and instructions, less case. Original Cosmac 14ELFrr kit nents minus case. Full instruc. White or S4R 3L1. with PC board, monitor, power supply plus all parts and instructs. 589.50 black plexiglass case. $5.00 1977 IC Update Master Board only 14.95 Military oscilloscope Model OS-4B/AP, # N383 -46496A. Manual Auto Clock Kit $15.95 - Schematic and instruction manual. Carl G. Kramer, 2525 Final 1977 closeout 515.00 while they 41/2 Digit DMM kit $85.00 ' DC clock with 4-.50" displays. Uses Midpine Dr., York, PA 17404. last. 1978 Master available late Jan. 1978 Volts-ohms-milliameter accuracywl National MA -1012 module with alarm $30.00. Complete IC data selector, 1234 count. Ranges: Volts -2, 20, 200. Ohms option. Includes light dimmer, crystal Schuttig & Co. Diversity Receiving TTY converter serial pg. master ref. guide, 17,000 cross ref- -2K, 2meg, 20 meg. Ma -200, 2000. timebase PC boards. Fully regulated, #61 made for U.S. Army Signal Corps. Information and erences. Free update for 1977. Domestic .4M display. Variable update rate. Comp. comp: instructs. Add $3.95 for beautiful schematics. Richard Dawson, 1308 F. St., The Dalles, OR postage S2.00. Foreign $6.00 w/parts, PC boards, instructs., less case. ' dark gray case. Best value anywhere. 97058. TERMS:' min. order U.S. Funds. Calif residents: add $5.00 6% tax. FREE: Send for your copy of our 1977 Philco Model 40-95 BankAmericard and Master Charge accepted. Code 122 console battery radio. Sche- QUEST CATALOG. Include 13¢ stamp. matic, parts list, and source. Robert Michael, R.D. 3442, ' Shipping charges will,be added. Fleetwood, PA 19522. O CIRCLE NO. 38 ON FREE INFORMATION CARD 101 AmericanRadioHistory.Com SONYRIKYÚTOSHIBA OUTSIDE OF JAPAN.. . NECHITACHIIMITSUMI SHINDENGEN MITSUBISHI NEW-TONEELECTRONICS Has the Largest Popular Electronics FUJITSUFUJI-TENJRC Inventory of Original Japanese Components SANYOR-OHM¿UNIDEN ADVERTISERS INDEX Anywhere! PANASONICCYBERNET PARTIAL LIST - CALL -US- FOR ALL, YOUR .DEVICE ,NEEDS SANKENNPCORIGIN READER SERVICE NO. ADVERTISER PAGE NO. 2SA49 .49 2SB492 1.00 2SC775 1.90 2SC1628 1 10 40081 1.50 S6087A 3 80 1.25 40082 3.00 3 2SA101 .49 ° 2SB495 75 2SC776 2.50 2SC1669 S60878 80 1.40 2SC777 4.95 2SC1674 .49 AN 136 2.90 STK011 7.50 I2SA102 .49 2SB507 1 A P Products Incorporated 89 1 2SC778 3 50 2SC1675 .49 AN214 3.35 SrK015 6.50 i 2SA200 .49 ` 2SB511 50 2 Ace Parts 101 2SA221 .79 2SB528 1.40 2SC781 2.50 2SC1678 2.00 AN239 6.50 STK025 12.50 Electronic 2SA234 59 2SB536 50 2SC783 2.95 2SC1679 2.95 AN24t 2.40 STK032 14.20 3 Active Electronic Sales Corp 95 49 2SC1684 a9 AN245 5.50 STK036 19.00 2SA353 .69 258539A a 70 2SC784 4 Ancrona Corp 84, 85 .65 2SC1728 1.85 AN247 4.80 STK050 -24.50 . 4 2SC785 2SA377 1.89 ' 2S8541 70 2SC1730 95 AN271 3.20 STK056 11.35 2SA387A .69 s 2SB554 800 2SC788 295 1.00 2SC1756 2.75 AN289 7.90 STK405 9.20 CREI Capitol Radio Engineering ' 2SA473 1.25 258561 .60 2SC789 2SA483 2.79' 2SB627 295 2SC790 150 2SC1760 1.60 AN315 3.50 STK415 8.50 Institute 70, 71, 72, 73 2SA484 2.44 2SC793 250 2SC1816 3.50 AN331 5.40 STK433 9.25 Cleveland Institute of 2SA485 1.95 ' 2SC32 1.35 2SC798 3.95 2SC1908 .49 AN343 3 90 STK435 9 50 Electronics, Inc 36, 37, 38, 39 1.39 2SC116 3.00 2SC799 325 2SC1909 3.75 AN360 2.50 STK437 11.50 2SA489 50 Cobra, Division of Dynascan 2SC1957 1.00 AN380 7.50 o STK439 11.60 2SA495 .60 2SC172 1.75 2SC815 .55 Corporation SECOND COVER 2SA496 .99 2SC206 2.50 2SC828 .49 2SC1964 3.95 BA302 2.50 ' TA7028M 3.50 2SA497 1.44 2SC237 1.75 2SC829 49 2SC1969 4.70 BA511 3.00 TA7045M 3 25 7 Communications Electronics 81 6A521 3.40 TA7051P 2SA509 .50 2SC281 50, 2SC830 2.95 2SC1973 .90 3.00 8 Continental Specialties Corporation 17 2SA525 1.95 2SC284 1.20 2SC838 50 2SC1974 3.50 C3001A 2.95 TA7054P 3 05 CX075B 2.95 TA7055P 3 00 ' 2SA537A 1.95 2SC287 1.25 2SC839 50 2SC1975 3.50 80 2SA539 .60 2SC291 3 95 2SC853 90 2SC2020 4.95 CX100D 8.50 TA7060P 1.40 9 Davis Electronics CX101G 8.50 TA7061P 1.50 2SA561 .48 2SC325 395 2SC866 5.00 2SC2027 6.00 10 Digi-Key Corporation ' 83 2SC367 .85 2SC867 6 00 2SC2028 80 CX103D 8.50 TA7062P 1.50 2SA562 .45 ; 11 Digital Group, The 106 2SA564 .50.2SC371 .49 2SC870 50 2SC2029 3.40 CX104A 8.50 TA7063P 1.50 2SA565 1.05 2SC372 .491 2SC871 .50 2SC2034 2.95 CX121A 7.50 I TA7072 3.00 2SA566 3.20 2SC373 .49 2SC900 .50 2SC2074 250 CX130A 7.00 : TA 7074 2 90 12 EICO 68 .49 2SC2075 4.00 CX148 11.70 I TA7075 3 75 2SA606 1.69 2SC374 2SC922 69 13 Edmund Scientific Co 96 14.00 ¡ 75 2SA624 99 y 2SC375 .49 2SC929 .49 2SC2091 2.50 CX149A TA7076 3 DN834 1.50 1A7089 2 90 14 Electronics Book Club 7 í 2SA628 .49 2SC380 .49 2SC930 49 2SC2092 3.25 2SA634 1.00 2SC381 .50 2SC938 95 2SC2098 3.90 DN835 1.60 TA7102P 5 80 Energy Technology, Inc 63 2SA636 1.25 2SC382 55 2SC943 1.00 2SC2166 3.75 DN837 1.50 TA7106P 3 25 .49 2SC384 .60 2SC945 .49 2SD45 4.95 DN838 1.70 TA7120P 1.50 2SA640 15 Fuji-Svea Enterprise 88 2SA643 .60 2SC385 70 2SC959 1.35 2SD68 .90 HA1151 3.20 TA7122 1.50 HA1157 4.20 TA7124 :' 2SA659 .49 2SC386. 70 2SC960 2.95 2SD72 .80 1.85 2SA663 4.75 2SC387 50 2SC984 .80 2S077 1.50 HA1158 4.20 TA7146P 3.751 16 Godbout Elecs., Bill 100 .49 2SC1000 .49 2S081 3.95 HA1159 5.00 TA7148 3.90 ¡:2SA666 .69 2SC394 17 Grantham College of Engineering 76 ' 2SA671 1.50 2SC403 .50 2SC1013 .95 2SD88 4.80 HA1199 3.25 TA7149P 3.90 2SA672 .70 2SC454 .49 2SC1014 .95 2SD118 3.00 HA1202 2.20 TA7150P 3 75 HA1306 4.90 : 5 ' 2SA673 .70 2SC458 .49 ' 2SC1017 1.20 2SD130 1.20 TA7153 6.90 5 Heath Company HA1308 4.50 ' 2SA678 .65 2SC460 .49 2SC1018 1.00 2S0170 1.50 TA7167 6.20 18 Hobbi-House 90 2SA679 4.95 2SC461 .49 2SC1030 2.80 2S0180 2.50 HA1312 3.40 - TA7200P 3 50 2SA680 4.95 2SC478 80 2SC1034 560 2SD187 49 HA1314 4 20 TA7201P 4 50 2SA682 1.49 2SC481 1.50 2SC1047 .59 2SD188 2.70 HA1316 3.50 TA7202 4 50 19 Illinois Audio 76 2SA683 .60 2SC482 1.40 2SC1060 1.40 2SD201 4.50 HA1318 5.00 TA7203 4 25 20 International Components Corp 89 4.20 TA7204 70 - 2SA684 .60 2SC484 2.60 2SC1061 1.25 2SD213 4 95 HA1322 3 21 International Electronics Unlimited 100 ' 2SA695 .60 2SC485 1.40 2SC1079 3 95 2S0217 3.80 HA1325 3.20 TA7205 3 60 1 HA1339A 4 , 2SA699 1.30 2SC486 50 2SC1080 3 95 2SD218 3 90 95 1A7207 3 50 2SA699A 1.45 2SC493 350 2SC1096 80 2S0227 .48 HA1342 4.50 ; TA7208 350 51 JS & A National Sales Group 1 4.50 2SD234 .85 HA1366 4.20 ' TA7209 3.80 2SA705 75 2SC494 2SC1098 100 22 Jade Computer Products 91 2SC495 .85 2SC1114 492 2SD235 .85 HA11112 8.90 TA7210 6.50 2SA706 1.45 THIRD : 23 Electronics COVER ; 2SA715 1.35 2SC496 .85 2SC1115 3.00 2SD257 3.50 HA11113 6.50 TBA800 4.40 James 2SA719 59 2SC497 1.40 2SC1116 4.25 2SD261 100 HD3113 4.90 ; TBA810DS 4.40 24 James Electronics 86, 87 2SC502 150 2SC1116A 4.75 2SD287 3.70 HD3127 7.80 ¡ TC4081P 1.75 2SA720 59 25 Jensen Tools & Alloys 77 '2SA721 .59 2SC503 1 75 2SC1124 1.20 2SD288 1.50 LA1201 4.25 ° TC5080P 5.80 '.2SA733 .49 2SC504 1.75 2SC1162 1.00 2SD313 1.05 LA1240 3.30 TC5081P 3.60 2SA740 1.95 2SC509 75 2SC1166 .48 2SD314 1.50 LA1364 3.70 TC5082P 4 00 27' McIntosh Laboratory Inc 14 2SC515 1.95 170B 4.95 2SD315 1 20 LA 1366 4.25 TC9100P 8 50 2SA745 4.50 2SC1 1 26 Multicore 18 :2SA747 5.75 2SC517 360 2SC1172 5.25 2SD318 1.95 LA1369 4.25 TD3400P 155 TD3441AP '2SA750 .49 2SC535 55 2SC1173 .75, 2SD325 .90 LA3155 2.25 . 510 1.00 8 9 10, 11 72SA756 330 2SC536 .49 2SC1175 .75 2SD330 1.50 LA3201 1.95 ' TM4312P NRI Schools 1.50 2SA758 5.60 2SC537 .49 2SC1209 .75 2SD331 LA3301 3.40 UH1C001 650 28 Netronics R & D Ltd 14 2SC538 60 2SC1211 .59 2SD356 1.00 LA3310 4,20 UH1C003 650 :2SA777 .99 29 New -Tone Electronics 94 2SA816 .70 2SC563 .90 2SC1212 1.65 2SD358 1.10 LA3350 3.30 UH1C004 6.50 :2SA839 1.95 2SC580 1.95 2SC1213 59 2SD360 1.05 LA4000 7.50 UH1C005 6.50 30 New -Tone Electronics 102 2SC608 5.95 2SC1226A .85 2SD382 1.20 LA4030 5.40 UH1C006 6.50 ' 2SC609 5.95 2SC1237 4.00 2SD427 2.55 LA4031P 3.20 UPC16C 250 2SB22 65 31 OK Machine & Tool Corporation 15 " 2SB54 49 2SC614 3 95 2SC1239 3.50 2SD525 1.50 LA4032P 4 20 UPC20C 3.75 2SB56 95 2SC619 65 2SC1306 3.50 2SCF6 1.25 LA4051P 3.20 UPC30C 3 /5 32 OK Machine & Tool Corporation 79 .49 2SCF8 3.50 LA4101 UPC41C 280 2SB75 .48 2SC620 2SC1307 4.75 , 3.20 33 Olson Electronics 78 .48 2SC627 2.95 2SC1308 2SF8 3.00 LA4201 3.25 UPC48C 395 2SB77 5.75 49 Olson Electronics 88 "2S8111 59 2SC632 60 2SC1312 .49 2SK19 1.25 LA4400 3.40 UPC157CA 250 2S8156 .95 2SC634A .60 2SC1313 .49 2SK23A 1.00 LA4420 3.40 UPC554C 2 50 34 Optoelectronics 6 2SB172 .60 2SC644 .49 2SC1317 .49 2SK30A .75 LAD001 3.20 . UPC555H 2.20 2S8175 .60 2SC645 .60 2SC1318 .49 2SK33 .90 LD3040 1.60 UPC563H2 8.00 35 PAIA Electronics, Inc 68 25B186 .49 2SC674 .60 2SC1327 .49 2SK34 .90 LD3120 2.40 UPC566H 1.25 36 Pickering & Co 44 2S8187 .55 2SC680 2.60 2SC1330 1.35 2SK40 1.30 M5112 8.40 , UPC573C 3.25 " 258202 1.50 2SC684 1.20 2SC1342 .49 2SK55 1.00 M5151PR 7.80 UPC575C 2.60 37 Poly Paks 99 ; 0 2SB227 2.95 2SC693 .49 2SC1344 .49 3SK22 2.20 M5152L 2.75 UPC576 3.25 2SB234 2.95 2SC696 1 75 2SC1347 .85 3SK22Y 2.20 M5192 4.80 ' UPC587C2 2.95 38 Quest Electronics 101 1 1.40 í 2S8235 7.95 2SC699 - 5.95 2SC1359 .65 3SK35 2.00 M511711 2.00 UPC592H2 2S13270 .79 2SC708 1.75 2SC1360 .95 3SK39 2.00 M51513L 5.10 UPC595C 2.95 2SB303 .49 2SC710 .49 2SC1362 .52 3SK40 2.00 MB3705 3.35 UPC596C 2.75 39 Radio Hut 92 .49 , MN3001 19.50 UPC1001H2 3 50 I 2SB324 .60 2SC711 2SC1364 1.10 3SK41 2.20 Radio Shack 82 " 2SB337 1.35 2SC712 .49 ; 2SC1377 4.80 3SK45 2.20 MN3002 11 70 UPC1008C 5.75 '2SB370 .65 2SC715 .69 2SC1382 .95 3SK49 2.20 MN3003 9.45 UPC1020H 325 40 Ramsey Electronics 95 ' 2SB405 .60 2SC717 50 2SC1383 .50 JSP7001 .75 MN3004 17.95 UPC1025H 350 10 . 1.35 2SC730 4.15 .80 MÁ26 .28 MN3005 75.00 UPC1026H 3 2SB407 2SCt384 41 S. D. Sales Co 93 2S8415 .65 2SC731 3.00 2SC1402 3.60 MPS8000 1.25 MN6040 16.75 UPC1152H 3.95 '.2SB434 1.15 2SC732 .49 2SC1403 3.60 MPS8001 1.25 MN6040A 1675 UPC1154H 395 Sams & Co., Inc., Howard W 23 2SB435 135 2SC733 .49 2SC1419 .95 MPSUO2 .50 UPC1155H 3.95 42 Sansui Electronics Corp 13 ` 2SB440 .60 2SC734 .49 2SC1447 .90 MPSU31 4.00 PLLO1A 13.50 UPC1156H 4 50 43 Schober Organ Corp., The 81 2SB461 1.60 2SC735 .49 2SC1448 1.00 MRF8004 3.00 PLLO2A 8.50 UPC1380C 950 2SB463 1.40 2SC738 .49 2SC1449 .85 SD1074 19.95 PLL02AG 8.50 UPC78L05 1.40 44 Scientific Audio Electronics, Inc 58 4.80 4 - 2SB471 1.40 2SC756A 2.40 2SC1475 1.25 SD1076 28.95 SG609 UPD277C 50 45 Solid State Sales 89 ^ 25B472 2.60 2SC763 .49 2SC1507 1.40 4004 3.00 SG613 6.75 UPD857C 15 50 46 Southwest Technical Products Corp 2 2SB474 1.10 2SC773 .60 2SC1509 .85 4005 3.00 S6080A 3.75 , UPD858C 9.50 2SB481, 1.50 2SC774 . 1.50 2SC1624 1.10 , 40080 1.25 S60808 3.80 UPD861C_ 18.50 . TEAC Corporation of America FOURTH COVER MINIMUM ORDER $SAO, 47 Tri-Tek, Inc 65 All orders odd 51.00 Postage and Handling. Canada 51.50 48 Wilson Electronics Corp 22 , Residents add 5 sales N.J. é tax a Oi ELECTRONICS. DEALERS: Write on letterhead for confidential price list. CLASSIFIED ADVERTISING 103, 104, 105 24 HOUR SHIPMENT ON ALL DEVICES IN STOCK. P.O. BOX 1738A, Bloomfielld, N.J.07003a ALL GUARANTEED COD ORDERS WELCOME Phone: (201) 748-6171, 2, 3 PARTS - .. CIRCLE NO. 30 ON FREE INFORMATION CARD 102 POPULAR ELECTRONICS AmericanRadioHistory.Com ectronics Cassif ie: REGULAR CLASSIFIED: COMMERCIAL RATE: For firms or individuals offering commercial products or services, $2.40 per word. Minimum order $36.00. EX- PAND-ADI, CLASSIFIED RATE: $3.60 per word. Minimum order $54.00. Frequency discount; 5% for 6 months; 10% for 12 months paid in advance. PERSONAL RATE: For individuals with a personal item to buy or sell, $1.40 per word. No minimum! DISPLAY CLASSIFIED: 1" by 1 column (2-1/4" wide), $280.00. 2" by 1 col- umn, $560.00. 3" by 1 column, $840.00. Advertiser to supply film positives. For frequency rates, please inquire. GENERAL INFORMATION: Ad copy must be typewritten or clearly printed. Payment must accompany copy except when ads are placed by accredited advertis- ing agencies. First word in all ads set in caps. All copy subject to publisher's approval. All advertisers using Post Office Boxes in their addresses MUST supply publisher with permanent address and telephone number before ad can be run. Advertisements will not be published which advertise or promote the use of devices for the surreptitious interception of communications. Ads are not acknowledged. They will appear in first issue to go to press after closing date. Closing Date: 1st of the 2nd month preceding cover date (for example, March issue closes January 1st). Send order and remittance to Classified Advertising, POPULAR ELECTRONICS, One Park Avenue, New York, New York 10016, Attention: Hal Cymes. BUILD STEREO SURPLUS ELECTRONICS - FOR SALE SPEAKERS ATTENTION HOBBYISTS - SEND FOR WITH JUST GLUE YOUR FREE CATALOG AND STAPLES. FREE! Bargain Catalog-I.C.'s, LED's, readouts, fiber op- Great buys in tape drives, keyboards, power supplies, and transformers. We also have heat tics, Save up to 50% of the cost of ready - calculators parts & kits, semiconductors, parts. Poly sinks, steel cabinets, I/O terminals, video dis' Paks, Box 942PE, Lynnfield, Mass. 01940. built speakers by assembling Speak- erlab kits. We've done the design, plays, printers, and equipment cases. And of GOVERNMENT and industrial surplus receivers, transmit- carpentry and wiring, leaving you course components, fans, wire, and cable. Write now to ters, snooperscopes, electronic parts, Picture Catalog 25 only the actual installation of the 10 Flagstone Drive cents. Meshna, Nahant, Mass. 01908. speaker drivers. Most people take less than two hours to Worldwide Electronics Hudson, NH 03051 assemble a kit. Illustrated, easy -to -follow instructions LOWEST Prices Electronic Parts. Confidential Catalog check you each step of the way. (And if you still can't finish Free. KNAPP, 3174 8th Ave. S.W., Largo, Fla. 33540. the kit, we'll do it for you for just the cost of return freight.) AUDIO EXPERIMENTERS, Serious Music Syn- When you're through, you have a high quality, multi - ELECTRONIC PARTS, semiconductors, kits. FREE FLYER. thesizer Stuff: literature, kits, components, cir- Large catalog $1.00 deposit. BIGELOW ELECTRONICS, element stereo speaker with a resonance -free enclosure, fiberglass damping, a crossover with real L -pads, and Bluffton, 45817. cuits and more. Send SASE for FREE INFO. CFR Ohio drivers that are some of the best in the industry. RADIO-T,V, Tubes -36 cents each. Send for free catalog. Send for our free 52 -page catalog. It's practically a Associates, PUB F, Newton, NH 03858. manual on speaker building and acoustics. Cornell, 4213 University, San Diego, Calif. 92105. SEEKING ORIGINAL JAPANESE TRANSISTORS FOR CB Speakerlab Inc., Dept. PE -F AMATEUR SCIENTISTS, Electronics Experimenters, AND STEREO REPAIR? Request complete list. Compare 1 5500 35th N.E., Seattle, WA 98105 Science Fair Students...Construction plans-Complete, to 9 prices, 2SC710, 59 cents; 2SC517, $3.95; 2SC799, including drawings, schematics, parts list with prices and BUILD AND SAVE. TELEPHONES. TELEVISION, DETEC- $3.60; 2SC1306, $4.40: 2SC1678, $2.25; TA7205P, $3.90; sources... Robot Man - Psychedelic shows - Lasers - TIVE, BROADCAST Electronics. We sell construction BA521. 53.70, BA511, $3.40. Fuji-Svea Enterprises, Dept. P, Emotion/Lie Detector - Touch Tone Dial - Quadraphonic plans with an Engineering Service. Speakerphones, An- Box 40325, Cincinnati, OH 45240. Adapter - Transistorized Ignition - Burglar Alarm - swering Machines, Carphones, Phonevision, Dialers, Color FREE CATALOG. Solar Cells, Nicads, Kits, Calculators, Sound Meter...over 60 items. Send 50 cents coin (no TV Converters, VTR, Games, $25 TV Camera. Electron Digital Watch Modules. Ultrasonics. Strobes, LEDS, Trans- stamps) for complete catalog. Technical Writers Group, Microscope, Special Effects Generator. Time Base Correc- istors, IC's, Unique Components. Chaney's, Box 27038, Box 5994, University Station, Raleigh, N.C. 27607. tor, Chrome Key. Engineering Courses in Telephone, Inte- Denver, Colorado 80227. METERS-Surplus, new, used, panel or portable. Send for grated Circuits, Detective Electronics. PLUS MUCH MAKE YOUR PLANS COME TRUE by using electronic kit of list. Hanchett, Box 5577, Riverside, CA 92507. MORE. NEW Super Hobby Catalog PLUS year's subscrip- Touch Switch, Patrol Car Siren, Sound Switch. Singing tion to Electronic News Letter, $1.00. Don Britton Enter- MECHANICAL. ELECTRONIC devices catalog 10 cents. Bird. Each Kit $5.00 ppd. OMC, P.O. Box 4816, Irvine, Cali- prises, 6200 Wilshire Blvd., Los Angeles, Calif. 90048. Greatest Values - Lowest Prices. Fertik's, 5249 "D", Phila- fornia 92716. delphia, Pa. 19120. NAME BRAND Digital/Analog Test Equipment. Discount SPEAKERS Save 60%. Factory assembled or kits. Free prices. Free catalog. Salen Electronics, Box 82. Skokie, Il- - SOUND SYNTHESIZER KITS-Surf $12.95, Wind $12.95, catalog Quality Acoustics, 15428 Center, Harvey, Illinois linois 60076. Wind Chimes $17.95, Musical Accessories, many more. 60426. Catalog free. PAIA Electronics, Box J14359, Oklahoma SURPLUS COMPONENTS, Communication and test equip- City, OK 73114. ment. Illustrated catalog 25 cents. E. French, P.O. Box 249. Build The Artisan Electronic Organ.... BUGGED??? New locator finds them fast. Write, Clifton, Aurora, Illinois 60505. 11500-L N.W. 7th Avenue, Miami, Florida CB RADIOS, monitors, crystals, CD ignitions. Southland, The 20th century successor to the classic pipe 33168. organ. Kits feature modular construction, YOU WILL SAVE BIG MONEY! Box 3591-B, Baytown, Texas 77520. Surplus, Clearouts, with logic controlled stops and RAM Pre -Set Bankruptcy, Inventory, Deals. Catalog $1 (redeemable). ET - TELEPHONES UNLIMITED, Equipment, Supplies, COA Electronics, Box 741, Montreal, H3C 2V2. U.S. Inqui- Memory System. Be an artisan. Write for ries. All types, Regular, Keyed, Modular. Catalog 50 our free brochure. AOK Manufacturing, Inc. HEAR POLICE / FIRE Dispatchers! Catalog shows ex- cents. Box 1147E, San Diego, California 92112. P.O. Box 445, Kenmore, WA 98028. clusive directories of 'confidential" channels, scanners. CARBON FILM RESISTORS 1/4W, 1/2W - 1.7 cents each. Send postage stamp. Communications, Box 56 -PE, Corn- FREE sample / specifications. Other components. COMPO- mack, N.Y. 11725. NENTS CENTER, Box 134P, New York, N.Y. 10038. TRANSISTORS FOR CB REPAIR, IC's and diodes. UNSCRAMBLERS: Fits any scanner or monitor, easily ad- PROFESSIONAL UNSCRAMBLERS - several models that TV audio repairs. 2SC799 - $3.00, 2SC1306 - justs to all scrambled frequencies. Only 4" square $29.95, fit any scanner. Free information. Capri Electronics. 8753T $2.95, 2SC1307 $3.85, TA7205 $3.50, fully guaranteed. Dealer inquiries welcomed. PDO Windom, St. Louis, MO 63114, - - Electronics. Box 841, North Little Rock, Arkansas 72115. more. Free catalog and transistor. B&D Enterpr- UNSCRAMBLE CODED MESSAGES 'from Police, RECONDITIONED Test Equipment. $0.50 for catalog. izes, Box 32, Mt. Jewett, PA 16740. Walter's Test Equipment, 2697 Nickel, San Pablo, CA Fire and Medical Channels. Same day service. CRYSTAL CONTROLLED DIGITAL CROSSHATCH/DOT 94806. Satisfaction guaranteed. Don Nobles Electronics, GENERATOR. Kit $31.95, built $41.95. Free Catalog. PHOTOLUME CORP., 118 East 28 Street, New York, NY POLICE/Fire scanners, large stock scanner crys- Inc., Rt. 7, Box 265B, Hot Springs, Arkansas 10016. tals, antennas. Also CBs. Harvey Park Radio, Box 71901. (501) 623-6027. MAKE PROFESSIONAL QUALITY PC boards with silk- 19224, Denver, CO 80219. screen techniques. Complete information, $4.95 postpaid. TELETYPE EQUIPMENT for sale for beginners and exper- ANYONE CAN SOLDER WITH TerraTronic Research, Box 513JP, Quincy, III. 62301. ienced - KESTER computer enthusiast. Teletype machines, parts, rer. GOLDMINE OF PARTS, POWERFUL POWER SUPPLY, supplies. Catalogue $1.00 to: ATLANTIC SALES, 3730 DO-IT-YOURSELFERS! DOCUMENTATION, in complete CARTRI VISION electronic Nautilus Ave., Brooklyn, NY 11224. Tel: (212) 372-0349. Let Kester solder aid you in your home repairs assembly. Perfect for MICROPROCESSOR and all elec- or hobbles. A radio, TV, model train, WHOLESALE C.B., Scanners, Antennas, Catalog 25 cents. jewelry, tronic applications. $24.95 total, Master Charge, Bank- plumbing, etc. it Save money - repair yourself. Americard. Free Brochure. MADISON ELECTRONICS, IN- Crystals: Special cut, $4.95, Monitor $3.95. Send make. Send self-addressed stamped envelope to Kesler model, frequency. G. Enterprises. Box 461P. Clearfield, UT for a FREE Copy of "Soldering Simplified". CORPORATED, 369, Madison, Alabama 35758. SATISFAC- TION GUARANTEED. 84015. 4201 Wrightwood Ave. KESTER SOLDER / Chicago, ill. 60639 17 -DIGIT ELECTRONIC TIMEPIECE KIT. Simul- ORGAN KITS taneous date, time, alarm, and timer readout, USED TEST EQUIPMENT - Tektronix, HP, GR. Write: PT', KEYBOARDS Box 8699, White Bear Lake, MN 55110_ Phone: (612) $109.00. PINK NOISE GENERATOR KIT, $9.95. THE ULTIMATE IN DESIGN 429-2975. West Side Electronics, Box 636-P2, Chatsworth, AND SOUND WEATHER MAP RECORDERS: Copy Satellite California 91311. A Demo Record & Brochure $1.00 Wunºzer reproductions Photographs, National -Local Weather Maps. Learn MUSIC - CMOS Envelope Generator - Attack - Fallback - Sustain - Decay: Versatile - Highest quality - Inexpensive. DEVTRONIX ORGAN PRODUCTS, Dept. C How! $1.00. Atlantic Sales, Nautilus Ave., 3730 Plans $2.50. POE, 18578 Haskins, Chagrin Falls, Ohio 5872 Amapola Dr. e San Jose, CA 95129 Brooklyn, N.Y. 11224. Tel: (212) 372.0349. 44022. JANUARY 1978 103 AmericanRadioHistory.Com UNREAL CATALOGS. Surplus, Factory Liquidations, Bank- CONVERT TV TO DON'T PURCHASE alarm equipment before getting our ruptcy Inventories, Deals. Thousands of items at Bargain free value packed catalog. SASCO, 5619-C St. John, Kan- Surplus Prices. Rush $1. Etcoa Electronics, 521 5th Ave., .6 FT. WIDE SCREEN! sas City, MO 64123. (816) 483-4612. NYC, NY 10017. Easy Do -It -Yourself Kit NEW PERIODIC TABLE OF ELEMENTS. Atomic physics Project a giant 5'x6' picture onto wall or screen. INVENTIONS WANTED breakthrough now reveals precise atomic models of each 8&W/Color. Kit contains detailed plans, Inst., and element. Striking wall chart, $3.00. Circlon, 29500 Green - Precision Lens System. Only $15.95 ppd., river Gorge, Enumclaw, WA 98022. Guata^" or write for Free illustrated detail;. teed k; The Macrocoma Co., Dept. DE . CB SWL LOG, 10 Code CB SWL Freqs log sheets only Won" _Washington Crossing, PA 18977 $3.00. Tatinger, 4028 West 83th Street, Chicago. Illinois - 60652. .e . t - TESLA COILS. 40 page booklet shows how to construct five MIXERS-Preamps-Speakers, Top Quality coils from 50,000 to 5,000,000 volts. Arcs to 100". Also in- Kits -Plans -Parts. Send 25 cents for catalog. I. cludes history, theory, 25 experiments and information you need to design testa coils. Booklet $10.00. High Tension Audio Design Si Engineering Co P.O. Box 154, RECOGNITION...FINANCIAL 'e Electronics, Box 1371, Garden Grove, California 92642. Lee, Mass. 01238. (413) 243.1333. REWARD...OR CREDIT LOWEST COMPONENT PRICES, test equipment & surplus. THE "KING OF KITS". Artisan Organ Kits feature all new FOR "INVENTING IT FIRST' MAY BE YOIJRSI Free flyer. A&S Supply, 265 Willard, Ounicy, MA 02169. modular construction, with logic -controlled stops and RAM If you have an idea for a new product, or a way ULTRAVIOLET EPROM ERASER. Automatic. Handles all Preset Memory System. Write for brochure to: AOK to make an old product better, contact us, "the eprom types. $98.00. Free data sheet. Kingston Laborato- Manufacturing. Inc., P.O. Box 445, Kenmore, WA 98028. idea people" We'll develop your idea, introduce it to industry, negotiate for cash sale or royalty licensing. ries, Box 894-P. Melbourne, Fla. 32901. (305) 723-2200. ROBOT Plans That Work! $5.00. American Robots, Dept E, Write now without cost or obligation for free P.O. Box 1304, Tulsa, OK 74101. GIVE MAKE, Model, we'll quote price. CB scanners ect. information. Fees are charged only for contracted Randall's, 7035 N. 39th. Milwaukee, WI 53209. Scanner FIVE LASER PLANS $8.00; Welding -Burning services. So send for your FREE "Inventor's Kit." It crystal certificates $2.50 each. - has important Marketing Information, a special Laser plans $9.00. Catalog $2.00. Solaser, PE "Invention Record Form" and a Directory of 1001 X&K RADAR DETECTORS. Factory overstock sale of a na- - Corporations Seeking New Products. tionally sold unit that is fully assembled and sold as is with 178, Box 1005, Claremont, California 91711. schematic untested and less Microwave - case. parts NEGATIVE ion generator. Complete plans. $10.00. Fas- RAYMOND LEE ORGANIZATION alone worth twice this. X Band, $29.95; XEK Band. $39.95. cinating details, $1.00. Golden Enterprises, Box 1282 -PE, 230 Park Avenue North.New York.NY 10017 Check or money order. KEC 508 East Electronics, Oak St., Glendale, Arizona 85311. At no cost or obligation, please rush Lafayette, CO 80026. Tech. info. catalog 35 cents. my FREE "Inventor's Kft No. A.112 " DIGITAL REVERE. Fully electronic. Plans and PCB avail- WIRE and cable. Send for free list. Ram Electronics, Box able. Send SASE for free info. Neves, Box 10327, Stanford. 336-P. Brookhaven, N.Y. 11719. CA 94305. Name IMPROVE MOBILE C.B. output power up to 45%. cheap BUILD YOUR OWN UFO Detector with complete easy to Address and simple to make accessory, complete instructions, follow plans. Three designs, $3.00 postpaid. UFO Alert. $1.00. R. Brodell, Box 530. Farmingdale, N.Y. 11735. Zip P.O. Box 1741, Owensboro, KY 42301. (City Stale UNBELIEVABLE Goldmine of Electronic Schematics. 201 Phone No Area Code Dynamite Projects. $9.99. Send for Free Project List. Pro- fessional FM Wireless Mic Plans. $2.00. Spacetech, Box BUILD YOUR OWN FREE PAMPHLET: "Tips on Marketing Your Invention", 182, Gillette. N.J. 07933. from an experienced fee -based Invention service company. PARALINE Manufactures and stocks transformers. Free Write: United States Inventors Service Company, Dept, T, ° Data. Paraline, Dept -S, 515 S. Palm, Alhambra, CA 91803. SYMPHONY 1435 G Street NW, Washington DC 20005. UNSCRAMBLER KIT: Tunes all scramble frequencies, may INVENTIONS. IDEAS, WANTED! Presentation to Industry. be built-in most scanners, 2-3/4 X 2-1/4 X 1/2. $19.95. Facto- OF SOUND! IMI, Suite 1200-ZD, 401 Wood Street, Pittsburgh, Pennsyl- ry built Code -Breaker. $29.95. Free Catalog: KRYSTAL it's fun and easy -takes Just minutes vania 15222. KITS, Box 445. Bentonville, Ark. 72712. (501) 273-5:40. a day! Complete kits for organs, BEARCAT 210/Regency Touch, $259.95. All radios dis- planos, strings, rhythms, TELEPHONES & PARTS counted. Call (707) 544-4388. McDonald, Box 7492(P), San- amplifiers, synthesizers. Also ta Rosa, CA 95401. factory assembled. 104 -page catalog $2.00 SEKTRONIX USED EQUIPMENT bought and sold. Call: 17 TELEPHONES GALORE, beautiful styles, colors, COM-TEC ASSOCIATES, 18 Gould Street, Stoneham, spectacular designs Mass. 02180. (617) 438-6190. ®WEREI to enhance any decor. Lowest Wersi Electronics, Inc.. Prices! Full Details, $1.00 refundable, Mailine, Dept. ZD, Box 5318, PLANS AND KITS Lancaster, PA 17602. P.O. Box 570, Wall St. Sta., NYC, NY 10005. TELEPHONES AND PARTS. Free catalog. Write: Surplus Saving Center, P.O. Box 117, Waymart, PA 18472. HIGH FIDELITY AMAZING ELECTRONIC YOUR TELEPHONE STORE. Free mail-order cata- log of phones, cords, plugs, jacks, much more. DIAMOND NEEDLES and Stereo Cartridges at Discotnt V. PRODUCTS Flemco, 20272 37th Ave. N.E., -f/ prices for Shure, Pickering, Stanton, Empire, Grado and Seattle, Wash. LASERS SUPER POWERED, RIFLE, PISTOL POCKET . SEE IN DARK . PORO. TECHNICAL DEBUGGING UNCRAMBLERS GIANT TESLA. STUNWAND TV ADC. Send for free catalog. LYLE CARTRIDGES, Dept. P. 98155. DISRUPTER . ENERGY PRODUCING, SCIENTIFIC DETECTION, ELECTRIFYING, CHEMICAL, ULTRASONIC. CB, HERO, AUTO AND MECH DEVICES. HUNDREDS Box 69, Kensington Station, Brooklyn, New York 11218. For MORE ALL NEW PLUS INFO UNLTD PARTS SERVICE. Fast Service call Toll Free 800-221-0906. INFORMATION unfimifed INSTRUCTION CATALOG SI Box 626 Lord Jeffery P2. Amherst. N.H. 03031 BURGLAR ALARMS LEARN ELECTRONIC ORGAN SERVICING at home all makes including transistor. Experimental kit-trouble- FREE KIT Catalog contains Test and Experimen- shooting. Accredited NHSC, Free Booklet. NILES BRYANT ter's Equipment. Dage Scientific Instruments, Box SCHOOL. 3631 Stockton, Dept. A, Sacramento, Calif. Burglar ..Smoke 95820. 1054P, Livermore, CA 94550. Fire .Álarm Catalog. SCORE high on F.C.C. Exams...Over 300 questions and answers. Covers 3rd, 2nd, 1st and even Radar. Third and Second Test, $14.50; First Class Test, $15.00. All tests. Billions of dollars lost annually due $26.50. R.E.I., Inc., Box 806, Sarasota, Fla. 33577. TIGER SST to lack of protective warning alarms. SIMPLI-KIT UNIVERSITY DEGREES BY MAIL! Bachelors, FREE CATALOG Shows you how to Masters, Ph.D's. Free revealing details. Counsel protect your home, business ing, Box 317-PE01, Tustin, California 92680. and person. Wholesale SELF -STUDY CB RADIO REPAIR COURSE. THERE'S MONEY TO BE MADE REPAIRING RADIOS. prices. CB This easy- FOR Do-it-yourself. Free to -learn course can prepare you for a career in electronics THE DO-IT-YOURSELFER engineering service. enabling you to earn as much as $16.00 an hour in your spare time. For more information write: CB RADIO REPAIR high quality CD Electronic '4010a Burden Security to. COURSE. Dept. PE018. 531 N. Ann Arbor, Oklahoma City, Ignition System in kit form. Okla. 73127. PE 018 Contains all components and solder to Box 82802 Lincoln, Ne. 68501 , LEARN WHILE ASLEEP! HYPNOTIZE! Astonishing details, build complete Solid -State Electronic strange catalog free! Autosuggestion, Box 24-ZD, Olympia, CD Ignition System for your car. As- Washington 98507. sembly requires less than 3 hours. QUALITY BURGLAR/FIRE ALARM equipment at discount prices. Catalog 50 cents. Steffens. Box 624C, Cranford, N.J. GRANTHAM'S FCC LICENSE STUDY GUIDE -377 pages. Increases MPG 15% Eliminates 4 of 5 tune-ups 1465 questions with answers/discussions-covering third, Increases horsepower 15% Instant starting, any 07016. Plugs and Points last weather second, first radiotelephone examinations, $13.45 post- 50,000 miles Dual system switch WHY WORRY about leaving car lights on? ALARM paid. GSE, P.O. Box 25992, Los Angeles, California 90025. Fits only 12 volt neg. ground... Only $21-_95 postpaid ALERTS with pulsing tone. $11.75. INFORMATION INTENSIVE 5 week course for Broadcast Engineers. FCC First Class license. Student rooms at the school. Radio Star Corporation AVAILABLE. CFL Enterprises, Box 415, Export, PA P.O. Pox 1727 Grand Junction, Colorado 81501 Engineering Inc.. 61 N. Pineapple Ave., Sarasota, FL 33577 15632. and 2402 Tidewater Trail, Fredericksburg, VA 22401. 104 POPULAR ELECTRONICS AmericanRadioHistory.Com 1977 TESTS -ANSWERS for FCC First Class License. Plus "Self -Study Ability Test." Proven! MUSICAL INSTRUMENTS HOME ENTERTAINMENT FILMS $9.95. Moneyback Guarantee. "FREE" BRO- CHURE. Command, Box 26348-P, San Francisco UP TO 60% DISCOUNT. Name brand instruments catalog. YOUR XMAS GIFT $SS GO FURTHER WITH SPORTLITE. 94126. Freeport Music, 114 G. Mahan St., W. Babylon, N.Y. 11704. Where Jesus Walked (filmed entirely in the Holyland), 400' S8 Eastman Color Sound, $43.95 ea PPD. Ross Hunter's Airport NEW FCC License Exams and instructional mate- BUSINESS OPPORTUNITIES (Burt Lancaster, Jacqueline Bisset) S8. 400' Color Snd, $42.95 (you save $7.). Universal 16mm B&W/Optical rial by author of published FCC License work- Snd 400' reel Horror Science Fiction - your choice The books. Covers Second -First Classes and Radar. Mummy's Ghost (No. 1049), The Wolfman (No. 1050), Dra- I MADE $40,000.00 Year by Mailorder! Helped others make cula (No. 1023) only 533.95 ea + 51. shipping (you save Hundreds of questions and answers with full solu- money! Free Proof. Torrey, Box 318 -NN. Ypsilanti. $6.). For a laugh, Abbott & Costello in High Fliers (No. 816) Michigan 48197. tions. Free counselling service. $19.95. Victor & No Indians, Please (No. 808) 16mm B&W Snd 532.95 ea FREE CATALOGS. Repair air conditioning, refrigeration. Veley, P.O. Box 14, La Verne, Calif. 91750. + $1. pstg. (this is 1976 price, save $7.). LIMITED OFFER. Tools. supplies. full instructions. Doolin, 2016 Canton. For Speed Sports Fans, "Wheels Keep Rolling" '76 Indy LEARN LANDSCAPING AT HOME. Start profitable busi- Dallas, Texas 75201. "500" spectacular S8 color, 200' reel, 518.95 ea PPD. En- ness or hobby. Free booklet. Lifetime Career Schools, MAILORDER MILLIONAIRE helps beginners make $500 close ad with order. Columbia catalog $0.85: Universal 8 Dept. A-429, 2251 Barry Avenue, Los Angeles. California weekly. Free report reveals secret plan! Executive (1K1), catalog $0.75; Sportlite forms $0.35, SPORTLITE FILMS, 90064. 333 North Michigan, Chicago 60601. Elect -1. Box 24-500. Speedway, Indiana 46224. GET RICH with Secret Law that smashes deots and brings WANTED you $500 to 55 Million cash. Free report! Credit 4K1, 333 PERSONALS North Michigan. Chicago 60601. GOLD, Silver, Platinum, Mercury wanted. Highest prices MAKE FRIENDS paid by refinery. Ores assayed. Free circular. Mercury Ter- HIGHLYONE-MAN WORLDWIDE through international correspondence. Illustrated free. Hermes-Verlag, minal, Norwood, MA 02062. PROFITABLEBLE brochure Box 11CS60/Z, D-1000 Berlin ELECTRONIC FACTORY 11. Germany. TUBES CHESS ENTHUSIASTS - play by mail. Free information for Investment unnecessary, knowledge not required, SASE. ARS-Chess, P.O. Box 1145, MacArthur Station, PA sales handled by professionals. Postcard brings 15001. RADIO & T.V. Tubes -36 cents each. Send for free facts about this unusual opportunity. Write today! Catalog. Cornell, 4213 University, San Diego, Calif. 92105. Barta-DA, Box 248, Walnut Creek, CA 94597. MAGNETS TUBES receiving, factory boxed, low prices, free price list. Transleteronic, Inc., 1365 39th Street, Brooklyn, N.Y. NEW LUXURY Car Without Cost. Free Details! Codex-ZZ. MAGNETS. All types. Specials -20 disc, or 10 bar, or 2 stick 11218A, Telephone: 212-633-2800. Box 6073, Toledo, Ohio 43614. or 8 assorted magnets, $1.00. Magnets, Box 192-H Ran- TUBES: "Oldies", Latest. Supplies, components, sche- $500 PER DAY POSSIBLE. New C.B. related business. dallstown, Maryland 21133. matics. Catalog Free (stamp appreciated). Steinmetz, 7519 - Send 25 cents. P.A. Schubert Company, P.O. Box 187. PE Maplewood, Hammond, Ind. 46324. Howell, Mich. 48843. HYPNOTISM TUBES, free low priced list. Specializing obsolete types. FREE REPORT: Big Money In Mail! Transworld-9K, Box TJ, Inc.. Box 43, Bradley Beach, N.J. 07720. 6226. Toledo, Ohio 43614. GET RICH!!! Secret law erases debts. Free report exposes SLEEP learning. Hypnotic method. 92% effective. Details TAPE AND RECORDERS millionaire'$$ secrets. Blueprints. No. EE1 453 W. 256. NYC free. ASR Foundation. Box 23429EG, Fort Lauderdale, 10471. Florida 33307. MECHANICALLY INCLINED Individuals desiring owner- FREE Hypnotism. Self -Hypnosis. Sleep Learning Catalog! 8 -TRACK and CASSETTE BELTS money back - ship of Small Electronics Manufacturing Business with- Drawer H400. Ruidoso, New Mexico guarantee. Long wearing. - 88345. Free Catalog - $3 minimum out investment. Write: Marks. 92-K1 Brighton 11th, AMAZING self-hypnosis record releases fantastic mental order. PRB Corp., Box 176. Whitewater, Wisconsin 53190. Brooklyn, New York 11235. power. Instant results! Free trial. Write: Forum (AA1), 333 EARN IMMEDIATELY STUFFING ENVELOPES. $300.00 North Michigan, Chicago 60601. GOVERNMENT SURPLUS Thousand Possible. Free supplies. Send Stamped en- velope. Salamon Industries - PE4, 6059 W. 55th St., Chicago, IL 60638. MISCELLANEOUS MANUALS for Govt radios, sets, Surplus test scopes. List FIRMS SEEKING MAILERS, homeworkers. addressers, 50 cents (coin). Books, 7218 Roanne Drive. Washington, S500.00 weekly possible. For list, rush $2.00, stamped self- D.C. 20021. addressed envelope. Bruce Raber Company, Dept. 01. GOVERNMENT SURPLUS. Buy in your Area. How, where. Greensburg, Kansas 67054. 1978 Electronic Experimenter's Handbook Send 52.00. Surplus, Headquarters 30177 -PE Building. GUARANTEED SECRETS of stuffing. envelopes for com- I Washington, D.C. 20014. fortable income! Free! Wayne, Box 644ZD, Ottawa, Kansas This latest edition includes a Hob- JEEPS -$59.30! CARS -$33.50! 200,000 ITEMS -GOV- 66067. byist and Microcomputer Section! ERNMENT SURPLUS a host exciting -Most COMPREHENSIVE DIREC- MAKE DURABLE building plastic easily. Waterproof. Fire- It also features of TORY AVAILABLE tells how, where to buy -YOUR AREA- construction projects with complete proof, Economical. Bays Laboratory. Rt. 1, Box 168, 52.00-MONEYBACK GUARANTEE-Government.Informa- construction plans, parts lists and Cedaredge, CO 81413. PLUS lion Services, Deparment GE -7, Box 99249, San Francisco, printed -circuit board patterns. complete Home Computer Buy California 94109. (433 California.) $1,000 TO $5,000 MONTHLY possible, work from your -A home, be your own boss. Details send 50 cents: Sutray ing Directory with product specifi- GOV'T SURPLUS buy direct from govt. and photos. - Complete info Enterprises, Box 6-D, Dept. PE, Concord, Ark. 72523. cations. latest prices, plus application form $2.00. Info -Capsule A-1, P.O. Box Only $1.95 ! PART-TIME CB DEALERS Wanted. McElectronics, Box 151, Shelocta, PA 15774, Order your copy from ELECTRONIC EXPERIMENTER'S 1385(P), Rohnert Park, CA 94928. HANDBOOK, Consumer Service Division, 595 Broad- EARN 51.000 monthly, spare time, at home, "GUARAN- way, New York, N.Y. 10012. Enclose $2.50' ($1.95 DO-IT-YOURSELF TEED." Write: UNICORN, ZE1, 7350 Nugget. Colorado plus 55c postage and handling). Outside U.S.A. $3. Springs, CO 80911. 'Residents of CA, CO, FL, IL, MI, MO, NY STATE, DC and TX add applicable sales tax (Postage and MODULAR TELEPHONES now available. Sets and com- handling charges non-taxable). ponents, compatible with Western Electric concept. Cata- EMPLOYMENT OPPORTUNITIES log 50 cents. Box 1147W, San Diego, California 92112. TAPE -SLIDE SYNCHRONIZER, lap -dissolve, multiprojector MPG INCREASED! Bypass Pollution Devices easily. RE- audiovisual plans $8.50. Free Catalog. Millers. 1896 ELECTRONICS/AVIONICS EMPLOYMENT OPPORTUN- VERSIBLY!! Free details-Posco GEE1, 453 W. 256, NYC Maywood, South Euclid, OH 44121. ITIES. Report on jobs now open. Details FREE. Aviation Employment Information Service, Box 240E, Northport. 10471. New York 11768 STOP LOSING YOUR HAIR. Free information. Write: REAL ESTATE TRANSLATORS required for freelance assignments in 30 Cheveux. Box 171, Station F. Montreal. Canada H3J 2L1. languages. Electronics, physics, chemistry, etc. SCITRAN, Dept. 1. U.S. Inquiries. P.O.B. 5456, Santa Barbara, CA 93108. BIG...NEW...FREE...SPRING CATALOG! Over 2,500 top values coast to coast! UNITED FARM AGENCY. 612 -EP. Retail Plan West 47th, Kansas City. MO 64112. BOOKS AND MAGAZINES Display All magazine retailers in the United SERVICES FREE book prophet Elijah coming before Christ. Wonderful States and Canada interested in earn- bible evidence. Megiddo Mission, Dept. 64, 481 Thurston Rd., Rochester, N.Y. 14619. ing an allowance for the display and QSL CARDS 500/$10. Sample. Bowman Printing, Dept. PE, POPULAR ELECTRONICS INDEXES For 1976 now avail- 743 Harvard, St. Louis, MO 63130. sale of publications of the Ziff-Davis able. Prepared in cooperation with the Editors of 'P/E," this index contains hundreds of references to product Publishing Company are invited to RUBBER STAMPS tests, construction projects, circuit tips and theory and is an essential companion to your magazine collection. 1976 write for details. Sales Manager, Edition, $1.50 per copy. All editions from 1972 onward still Select Magazines, 229 Park Avenue RUBBER STAMPS, BUSINESS CARDS. Many new prod- available al the same price. Add 5.25 per order for postage ucts. Catalog. Jackson's, Dept. K, Brownsville Rd., Mt. Ver- and handling, $.50 per copy, foreign orders. INDEX, Box South, New York, New York 10003. non, III. 62864. 2228, Falls Church, Va. 22042. JANUARY 1978 105 AmericanRadioHistory.Com 6E:,- 9 í+N+drr.o. ) li. 0666. 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