Popular Electronics

Popular Electronics n WORLD'S LARGEST- SELLING ELECTRONICS MAGAZINE AUGUST 1979 /$1.25 New, Exciting Low -Cost Projects For Joggers: Electronic Pedometer For Motorists: Low -Fuel Warning Buzzer For Boating: Portable Gas -Leak Meter For Basements: Sump Pump Switch /Alarm

.1.01116 10 Speaker System o ao HIE Phono Cartridge 11 in r II Model 4 Personal Computer 14024 14278 61730 CPO 66alli98 qbç Pop ddr -Ire vonlci www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 1 no loose ends

All -In -One: computer, floppy, I /0,16K RAM. $1595*

Oil 1N 2t1 eicroprocesfors Usti* 2.1488Nz

MwM! 16K bytes RAM expendable to 48K

Molly: 25 lines by 88 characters

Characters: 5 x 7 dot matrix, upper 6 lower case

6raphlcso 33 special graphics characters control (8 user -definable)

Keyboard! 72 keys, 61 alphanuuric t 12 function control (8 user- definable)

Nutria Mppadl 12 keys

Curer Addressing' relative 6 direct for Lull cursor control

pit Functions! Insert or delete character or lint

M1Ael Moral and revers, by character for hilhlighttng -

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1,-= '!d! ,MIL ,.111e,

New Heathkit® H89 102K bytes storage Learn by building All -In -One Computer Built -in floppy disk system gives you fast What better way tc learn about comput- access to programs and data. Each 5t/4- ers than to build one yourself? The All - Heath takes the risk out of selecting a inch diskette has more than 102K bytes In -One is available in easy -to -build kit balanced computer system. Now, video of storage area, enough to hold entire form, as well as completely assembled. terminal, floppy, keyboard and 8 -bit files. The All -In -One comes with 16K Like all Heath electronic kits, it comes to computer are brought together in one RAM, expandable to 48K. you with its own easy -to- follow assem- self- contained, compact unit. Nothing bly manual and a nationwide network of hangs out. Hundreds of uses at service centers to assure smooth sailing. Two Z80's home or work FREE CATALOG The personal computer has never been The All -In -One Computer runs programs For complete details on the simpler. Or smarter. Two Z80 microproc- written in MICROSOFT" BASIC and Heathkit Heathkit H89 All -In -One essors mean terminal never shares pow- ASSEMBLER Languages. And it accepts all Computer and nearly 400 er with computer, as do most desk -top current software written for the popular other electronic kits for your units. So this terminal is capable of a Heathkit H8 computer. You can choose home, work or pleasure, send multitude of high -speed functions, all from scores of practical programs for today for the latest Heathkit Catalog of values. controllable by keyboard or software. home and business. $1195 without floppy. Mail order kit price, F.O.B. Benton Harbor, MI. Also available at Heathkit Electronic Centers at slightly higher prices. Prices subject to change without notice. Heathkir CP-165 HEATH COMPANY, DEPT. 010 -560, BENTON HARBOR, MI 49022

CIRCLE NO. 5 ON FREE INFORMATION CARD

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 2 LEGAL DEFENSE

No -Fault Radar If you've ever been caught by radar or if you own a radar detector, please read this important message.

both police radar JS &A has never offered a radar detector. certain amount of tickets to qualify. With more The unit responds to and X and K and uses all solid -state As our president put it, "A radar detector is a and more motorists using radar detectors bands limits technology in its design. flagrant anti -police device that does nothing CB's, police must strictly enforce speed computer law- abiding selection of what we but permit abuse of our traffic laws." to reach their quotas. Now, even We urge you to test our motorists, who might make a slight mistake, feel to be the nation's finest radar detector. Although many devices were presented to are more vulnerable to speeding violations. Order one from JS &A. When you receive it, none were acceptable. Despite all of JS &A, drive to your nearest service station or CB our president stood firm, "Our NEW MEMORANDUM our efforts, dealer and have them install your unit. The will not, under any circumstances, In a recent memorandum our president company antenna installs with just a few brackets and radar detectors." stated, "Due to the changing nature of police sell the control unit attaches under your dash with radar, JS &A may offer radar detectors as part For three years we saw radar detectors - the Velcro material. bad because of our of its program if presented within the quality some good, some -but Then use it for 30 days. During that time, unable to offer a image of our company and if the product president's policy, we were count the number of radar traps you en- the units go to both X and K represents a truly unique radar detector single unit. We saw counter. On the 30th day, turn off your unit as the police develop radar jam- product." bands; we saw you travel. See how naked and unprotected we saw the FCC prohibit With the green light to find a radar detector, ming devices; and you feel. these jamming devices. We followed with our product selection group was prepared. great envy as other companies sold thou- They had brochures from practically every 40 DAYS PROOF sands of them while JS &A stood firm on its manufacturer in the world. And they eventually If for any reason you are not completely decision not to sell them. selected what even our president thought was satisfied, just return your unit within our 40 -day well- designed unit we'll gladly send you a prompt In January of 1979, our president was travel- the most professional and trial period and ling on an interstate highway at 55 miles per available. and courteous refund. hour. Other cars were passing him. HIDDEN ANTENNA To order your system, send $179.95 plus for postage and handling to the address As he approached the top of a hill, he Manufactured by a company called Chicago $3.00 below. (Illinois residents, please add neglected to pay attention to his speedometer. Radar, the unit consists of two parts -one that shown 5% sales tax.) Credit card buyers may call our As he rolled down the hill his speed increased is hidden behind your grill, and the other under toll -free number below. By return mail, you'll to 63 MPH. At the bottom of the hill was a your dash. There's nothing on top of your dash receive the complete system, all cables, police radar trap. board to indicate that you've got a radar Velcro material, instructions and a 90 -day was apprehended and charged with detector and the system is difficult for anybody He limited warranty. exceeding the speed limit by eight miles per to steal. The unit under your dash is attached The patented unit is precision crafted by hour. He was taken to a Justice of the Peace with a self- adhesive Velcro material so there's Chicago Radar -one of the most respected who was in the barber shop, so our president no screws or installation to worry about. names in radar detection systems. JS &A is had to wait until he finished. Finally there was a The control unit has two lights -one to indi -, America's largest single source of space -age quick trial and a fine was paid. cate that the unit is on, and the other to indicate products- further assurance that your modest Our president was four hours late. He felt that your car is under radar surveillance. There investment is well protected. that he was treated like a common criminal is also an audible alarm that will sound. But at We firmly support our police departments despite his good driving record and he lost night, when the light is all that you need, you their efforts, but if they are encouraged to very valuable time. can switch off the audible sound. and radar to maintain quotas, the law abiding The control unit plugs into your cigarette use ATTITUDE CHANGES has no choice but to protect himself. lighter. The radar antenna is placed behind consumer This small incident created an entire change today. Order your unit now at no your grill. Just pull into any service station and Start in his attitude. Our president saw for the first the mechanic can easily install the entire obligation. time that even law- abiding citizens are subject system. The Velcro material and mounting to the inequities of radar justice. He saw that o PRODUCTS brackets are all provided. the law- abiding citizen must also be protected T HAT from the abuses of radar power when unfairly AMPLIFIED SENSING O g THINK The antenna is one of the keys to the unit's used. Dept. PE One JS &A Plaza situation, high performance. Instead of the square - And when he studied the entire Northbrook, Ill. 60062 (312) 564 -7000 very fright- shaped dish antennas, the Chicago Radar our president realized something Call TOLL -FREE 800 323 -6400 motorists. Many police depart- version is a round cylinder. It tends to sense ening for all (312) 564 -7000 ments have quotas imposed on them to realize the radar signals sooner and around curves In Illinois Call Inc.,1979 either federal or state funds. They must issue a and hills because of its unique design. ©JS &A Group, AUGUST 1979 1

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 3 ANNOUNCING AMERICA'S ONLY LAND, SEA AND AIR SCANNER. Only the incredible, new, no- crystal Bearcat 220 Scanner tunes in all the real excitement of the entire AM aircraft band-plus every FM public service frequency -with pu button ease.

Now. Tune in all the real excitement of the wild blue yonder, at the touch of a button. The new, no- crystal Bearcat 220 Scanner searches and tunes in the entire aircraft band. Jets at 30,000 feet. All the tense tower talk. Everything is pre -programmed in space -age memory banks. Only the 7 -band Bearcat 220 Scanner also brings home every public service frequency, too. Pre -programmed Marine frequencies. Police action. Fire calls. Weather warnings. You name it. The new Bearcat 220 has all the features and quality Bearcat Scanners are famous for. Track tuning. Decimal display readout. Automatic Search. Selective Scan Display. Automatic squelch and EARCAT lockout. Priority. And much, much more. After all, Bearcat invented Scanning. And we'll stop at nothing to bring you all the excitement - Y20 SCANNER of land, sea. and air. Follow the leader to real excitement. Ele Copyright 1979 Electra Company Division of Masco Corp of Indiana 300 East County _me Road. Cumberland. Indiana 46229 CIRCLE NO. 20 ON FREE INFORMATION CARD 2 POPULAR ELECTRONICS

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 4 AUGUST 1979 Popular Electronics® ELECTRONICS MAGAZINE VOLUME 16, NUMBER 2 WORLD'S LARGEST -SELLING

Feature Articles SCANNER BEAM PINPOINTS THE ACTION!! Robert Grove 44 Make -it- yourself antenna for improved reception of public service bands. ', SIMPLE TRS -80 PROGRAMS SOLVE ELECTRONICS CALCULATIONS/ Roy Babylon 47 BASIC program for Ohm's law. resonance and inductive formulas. THE ART OF EQUALIZATION/ Ethan Winer 49 An expert tells how to achieve that special recorded 'sound." Construction Articles FOUR LOW -COST PROJECTS FOR YOUR FAMILY'S CONVENIENCE & SAFETY SOLID -STATE LEVEL -SENSING SWITCH FOR SUMP PUMPS/ Phillip Windolph 31 VEHICLE LOW -FUEL INDICATOR/ BradleyAlbing 34 About the cover: PORTABLE GAS LEAK METER/ Cass Lewart 41 ELECTRONIC PEDOMETER FOR JOGGERS/ Andrew A. Modla 42 A soldering iron BUILD A SPEAKER PROTECTION CIRCUIT/ Mike Rogalski 54 and a few SPACE -AGE ELECTRONIC PROJECTS FOR BOATS, Part 2/ Harold Wright 55 inexpensive parts How to build bilge alarms. a tachometer. and protection circuits. can be used to make some especially useful Columns devices to add STEREO SCENE/ Ralph Hodges 20 safety and convenience Recording as Nature Intended. to your lives. EXPERIMENTER'S CORNER/ Forrest M. Mims 60 IC Interval Timers. Cover Art by George Kelvin HOBBY SCENE/ John J. McVeigh 66 DX LISTENING/ Glenn Hauser 70 WARC -79 SOFTWARE SOURCES/ Leslie Solomon 73 JOSEPH E. MESICS Publixher COMPUTER BITS/ Leslie Solomon 74 Windows in the CRT. P. SALSBERG Editorial Dinetnr PROJECT OF THE MONTH/ Forrest M. Mims 78 A "Matchbox" LED Oscilloscope. LESLIE SOLOMON Terh, ,, l ()tree tor JOHN J. MCVEIGH Julian Hirsch Audio Reports ce hnrrol Editor FISHER MODEL ST460 SPEAKER SYSTEM 23 JOHN R. RIGGS Managing, Editor SHURE M95HE STEREO PHONO CARTRIDGE 24 HAROLD A. RODGERS LECTROTECH MODEL PPI -400 25 Senn, Falttor

ALEXANDER W. BURAWA Features P;ditnr Electronic Product Test Report 4 SYSTEM EDWARD I. BUXBAUM COMPUCOLOR II MODEL PERSONAL COMPUTER 67 Art I),rer'tor ANDRE DUZANT Te

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 5 Popular Electronics:

ZIFF -DAVIS PUBLISHING COMPANY Editorial and Executive Offices One Park Avenue. New York New York 10016 212 -725 -3500 Joseph E. Mesics (725 -3568) John J. Corton (725 -3578) Bonnie B Kaiser (725 -3580) Editorial Midwestern Office Sude 1400, 180 N Michiian Ave.. Chicago. IL 60601(312- 346 -2600) Western Office 9025 Wilshire Boulevard, Beverly Hills. CA 90211 213 -273 -8050: THE TV PIGGYBACKING FUROR Western Representative. Norm Schmdle, 7050 OwensmouthAve.. #209 Canoga Park, CA 91303 (813-999-1414: In Japan: James Yagi, Op Palace Aoyama. what appears to be a David vs. Goliath contest, Texas Instruments, with inspira- 6 -25, Minami Aoyama, 6 Chome, Minalo -Ki: tional support from RCA, is attempting to have rules on Class I devices for TV Tokyo, 407- 1930/6821.582 -2851 amended to include a Class II category. This would permit legal sale of stand- alone r -f modulators to be used for computers and peripherals. Such a change in the present interface rule that requires r -f modulators to be FCC type approved together with signal- source equipment is vociferously opposed by Radio Shack, ZIFF -DAVIS PUBLISHING COMPANY Apple, Commodore, and Interact, among personal computer makers. Philip B Korsant. President its Furman Hebb. Executive Vice President TI says, essentially, that unfair to make a buyer purchase a video monitor Phillip T. Heffernan. Sr Vice President when he could just as easily use an existing TV receiver if only the FCC would OK Edward D Muhlfeld. Sr Vice President the use r Philip Sine, Sr Vice President, Secretary of separate -f modulators. Other computer makers, who are already mar- Lawrence Sporn. Sr Vice President. Circulation and Marketing keting personal computers, cry "foul," saying, in a nutshell, that such approval Baird Davis, Vice President. Production would give TI an unfair marketing George Morrissey. Vice President advantage. Moreover, they point out that this Sydney H Rogers, Vice President would also cause increased interference with radio and TV reception. Sidney Holtz, Vice President TI also requested a temporary permit to go ahead with the separate r -f modula- Albert S Trama. Vice President Paul H Chook, Vice President tor concept while the FCC's bureaucratic wheels turn ever so slowly to reply to the Edgar W Hopper. Vice President company's initial request for changing the rules. (Note: the FCC has yet to act on a Robert N Bavier. Jr . Vice President Selwyn Taubman, Treasurer similar request by RCA made about two years ago.) The National Association of Broadcasters (NAB) observes that this second request amounts to trying to solve a W Bradford Briggs, Vice Chairman private marketplace problem by changing the rules. With the foregoing as background, let's examine the pro's and con's of the rules change proposal. [I'll ignore the waiver request entirely because (1) it indeed gives ZIFF CORPORATION a company not yet in the field an unfair advantage and (2) since the Part 15 radia- WNiam Zrff, Chairman tion standards are under active review, it's possible that the "temporary" r -f modu- I Martin Pompadur. President lators Hershel B Sarbin. Executive Vice President will not be in line with new standards.] From a typical consumer's viewpoint, using a separate modulator to connect a computer to one's own TV receiver would likely appear to be an ideal opportunity to save substantial monies. Given the fact that computers are great noise genera- POPULAR ELECTRONICS. August 1979, Volume 16.Num- tors, however, it is possible that interference within the household and on nearby Published ber 2 monthly at One Park Avenue. New York NY neighbors' receivers would be objectionable. Furthermore, a 10016 One year subscription rate for U S and Possessions. using home TV re- $13 00. Canada. $16 00, all other countries. $18 00 (cash ceiver as information display equipment results in lowered video quality under the orders only. payable in U S currency) Second Class postage paid at New York, NY and at additional mailing .offices best of circumstances when compared to video monitors. Authorized as second class mail by the Post Depart- Office Nevertheless, the possibility of employing a legalized r ment, Ottawa, Canada. and for payment of postage in cash separate -f modulator is POPULAR ELECTRONICS including ELECTRONICS an appealing one, and should be pursued. I firmly believe, though, that the FCC WORLD. Trade Mark Registered Indexed in the Reader's Guide to Periodical Literature should not rush into making a positive decision on this without setting signal radia- COPYRIGHT n, 1979 BY ZIFF -DAVIS PUBLISHING COM- tion standards that we can live with in the future. On the PANY ALL RIGHTS RESERVED other hand, it's unfair to Ziff-Davis also publishes Boating, Car and Driver, Cycle. penalize manufacturers by the foot -dragging procedures practiced by the FCC. Flying, Popular Photography, Skiing. Stereo Review. Elec- RCA, by tronic Experimenters Handbook, Tape Recording 8 Buying the way, has pointed out that the TI request for an r -f modulator physi- Guide, Stereo Directory 8 Buying Guide. and Communica- cally separated from computers is not the as its tions Handbook same petition for a rules change Material in this publication may not be reproduced in any that relates to all -in- one -package video disk and tape machines. So the company form without permission Requests for permission should be suggests three classifications: the present Class I TV directed to Jerry Schneider, Rights and Permissions, Ziff - devices that require type ap- Davis Publishing Co.. One Park Ave., New York, NY 10016 proval, a second classification for built -in r -f modulators, and a third for stand -alone Editorial correspondence: POPULAR ELECTRONICS, 1

Park Ave . New York. NY 10016 Editorial contributions must modulators. (How come RCA and other TV makers don't incorporate video jacks in be accompanied by return pottage and will be handled with their TV receivers, which reasonable care: however. publisher assumes no responsi- would make these rules change requests moot ?) bility for return or safety of manuscripts. art work, mod- or Since this is written in May, I hopefully will learn more about all this at the els Con- Forms 3579 and all subscription correspondence: POP- sumer Electronics Show in Chicago in June.

ULAR ELECTRONICS, Circulation Dept , P 0 Box 2774, Boulder. CO 80302. Please allow at least eight weeks for change of address Include your old address. enclosing. d possible, an address label from a recent issue

The publisher has no knowledge of any proprietary rights which will be violated by the making or using of any items disclosed in this issue.

(ABC Member Au,lir Bureau or irrulatio,s

4 POPULAR ELECTRONICS

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 6 Don't take our word for it.

"We can heartily recommend the Superboard II computer system for the beginner who wants to get into microcomputers with a minimum of cost. Moreover, this is a `real' computer with full expandability." Popular Electronics March, 1979

"(Their) new Challenger 1P weighs in at $279 and provides a remarkable amount of computing for this incredible price." Kilobaud Microcomputing February, 1979

"Over the past four years we have taken delivery on over 25 computer systems. Only two have worked totally glitch free and without adjustment as they came out of the carton: The Tektronic 4051 (at $7,000 the most expensive computer we tested) and the Ohio Scientific Superboard II (at $279 the least expensive) ... The Superboard Il and companion C1P deserve your serious consideration." Creative Computing January, 1979

"The Superboard II and its fully dressed companion the Challenger 1P series incorporate all the fundamental necessities of a personal computer at a very attractive price. With the expansion capabilities provided, this series becomes a very formidable competitor in the home computer area." Interface Age April, 1979

"The graphics available permit some really dramatic effects and are relatively simple to program ... The fact that the system can be easily expanded to include a floppy means that while you are starting out with a low -cost minimal system, you don't have to throw it away when you are ready to go on to more complex computer functions. Everything is there that you need; you simply build on to what you already have. You don't have to worry about trading off existing equipment to get the system that will really do what you want it to do. At $279, Superboard II is a tough act to follow." Radio Electronics June, 1979

"The Superboard II is an excellent choice for the personal computer enthusiast on a budget." Byte May, 1979 SUPERBOARD The world's first complete computer system on a board including full 1.L-- IP keyboard, video 61111 display, audio cassette interface, 8K BASIC -in -ROM and 4K RAM. Expandable. - Requires + 5V at 3 amp power supply.

C1P $349.00 Complete with enclosure and power supply. All features of Superboard II. Easy to expand to more memory and floppy disk.

C1 P MF $995.00 The first floppy disk based computer system the world has ever seen for under $1.000. 8K BASIC-in -ROM, 12K RAM. Expandable to 32K RAM. SCIEN TIFIC OHIO for full details. 1333 S. CHILLICOTHE RD., AURORA. OHIO 44202 (216) 562 -3101 See your Ohio Scientific dealer CIRCLE NO. 41 ON FREE INFORMATION CARD

AUGUST 1979 5

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 7 VcC

INPUT McIntosh R4 'No Lao / I0kNPUT "A Technological Letters RS Masterpiece..." + HIGH INPUT

SOLENOID THAT ISN'T We at Eumig thank POPULAR ELECTONICS for the fine review regarding our Metropolitan CCD cassette deck in the May 1979 issue. 1979 "Experimenter's Corner." Resistors R1, We did, however, note an error regarding the R2, and R3 form the reference voltage deck's transport in the "User Comment" sec- source with the upper limit defined by Vcc(R2 tion: "The solenoid- operated transport is + R3) /(R1 + R2 + R3) and the lower limit astonishingly silent. We heard none of the defined by VccR3 /(R1 + R2 + R3). For small thumps or clunks usually associated with windows, R2 determines the window open- solenoid operation." You then go on to state ing. For very small windows, McIntosh C 32 on the order of 0 that there is a "motor" sound instead of a to 15 mV, R2 can be eliminated and the solenoid sound. opening can be adjusted via R7. Resistors As a point of information, "More Than a Preamplifier" the reason sole- R4 and R5 protect the inputs from excessive noids are not heard is that there are no sole- current during accidental inputs exceeding noids. The motor sound is heard because the Vcc or ground. Diode limiting can be added McIntosh has received peerless ac- head mounting assembly is step -motor en- from the inputs to Vcc and ground, using Dl claim from prominent product gaged, using the same motor that governs and D2. fast forward testing laboratories and outstand- and rewind. -Tom Bensen, Eu- System stability is a function of Vcc stabil- mig (U.S.A.) Inc., Great Neck, NY ing international recognition! You ity and op -amp drifts. For 741 s and 747s, Vcc should be between 8 and 30 volts. FET -input can learn why the "more than a MAKING A BETTER WINDOW? op -amps lend themselves well to this applica- preamplifier" C 32 has been The window comparator circuit shown tion. Resistors R4, R5, and R6 limit LED cur- selected for these unique honors. above has fewer parts and has better input rent and should be chosen to allow about 10 protection than that shown in Fig. 5 of the May mA. -Glenn Fasnacht, Lakewood, OH. Send us your name and address and we'll send you the complete MOPED TURN INDICATORS vice is connected to a moped generator, if a product reviews and data on all Many thanks for "Solid -State Turn Indica- battery is used, as suggested in the article, it McIntosh products, copies of the tors for Mopeds" (May 1979). The article was would quickly discharge to the zener voltage. clearly written. The project international awards, and a North will almost certain- To obviate this, I would rewire the circuit as ly prevent American FM directory. You will accidents because blinking lights shown below. are easier to see and interpret. Also, understand why McIntosh product the pro- Note, too, that by substituting a dpdt (cen- ject is small enough to easily mount on all ter -off) switch for S1 several advantages research and development always mopeds. -Bill Saehler, Minnesota City, MN. arise. Diodes D3 and D4 are eliminated, light has the appearance and tech- While looking over the moped turn- indica- assemblies do not have to be insulated from nological look to the future. tor article, I noticed that D4 and C3 are not the frame, and return wiring from the lamps to switched out of the power circuit by S1. While the switch is not required. -Roy F. Gordon, this is not particularly important when the de- Hampton, VA. Keep up to date. SIA Send now - - - ..ß+6V T SIB

RIGHT W40 22.2k% 2 T Z2Z2i12++2i2 FI McIntosh Laboratory Inc. IA D4 VOTES: 6V - -- FRONT - - -- Box 96 East Side Station EL /MIA/ATE II 13 Binghamton, NY 13904 SHADED AREAS. rPF BOLD AREAS Name /ND/CNrE RI 12 4 ADDtr/ONS IK Address

R2 City I00K State Zip ICI 01 555 IN4001

If you are in a hurry for your catalog please send the coupon to McIntosh. For non -rush service send the Reader Service Card to the magazine. C2 10yF .OIyF CIRCLE NO. 35 ON FREE INFORMATION CARD

FRAME

6 POPULAR ELECTRONICS

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 8 Introducing the Troubleshooter. Six functions and 24 ranges for $129* make the jump from Analog to Digital more affordable than ever.

oC, dents in Alaska, Hawaii, and We call our new hand-held dC_. 8022A DMM the Troubleshooter. It Washington, the number is combines the basic performance (206) 774- 2481.) features you want with all the In Europe, contact: Fluke advantages that give digital (Nederland) B.V., P.O. Box 5053, DMM's the edge over analog - Tilburg, The Netherlands. Tele- 0.25% basic dc accuracy, a phone (013) 673973. Telex 52237. rugged, reliable design, a Ask about the new 8022A. And razor sharp 31 -digit while you're at it, check into the LCD readout, small size 8020A Analyst, the improved and light weight. version of our $169* DMM. It boasts Fluke's exclusive conduct- Measure for ance capability for high resis- measure you won't tance measurements and find a better value. 0.1% measurement accuracy. Six functions - Both instruments are high and low available at your ohms, ac and dc distributor from stock. voltage and For immediate current (24 ranges esponse, fill out in all) make the the attached Troubleshooter a 13 coupon. ounce (0.37 kg) package of excellent measurement value. This kind of value wasn't possible until our custom CMOS LSI single ity, temperature, and vibration. chip design made hand -held Function switches need to per- FLUKE DMM's an affordable reality and form reliably through thousands CIRCLE NO.21 ON FREE INFORMATION CARD Fluke the industry leader. of cycles. And electrical circuitry Here's something new that must survive both physical shock r Fluke's exclu- and electrical overloads. John Fluke Mfg. Co., Inc. won't shock you. P.O. Box 43210 sive probe design features finger We built the 8022A to with- Mountlake Terrace, WA 98043 guards on the probe and shrouded stand all these tortures -with a Please send 8022A'IYoubleshooter data. plastic connections to discourage acci- rugged impact resistant Please send the 8020A Analyst specs. case, a custom LCD display, dental contact with circuit Please have a salesman call. voltages. reliable pushbuttons instead of a more rugged rotary switches and over 20% of Name You won't find the components devoted to over- hand -held DMM. Title Mail Stop or reliable load protection. There's a lot more to building a Company high -quality hand -held DMM Take the next step. Contact than you might suspect. The case the Fluke office, representative Address has to survive bumps, scrapes, or authorized distributor in your City State Zip and scuffs. The LCD readout must area. In the U.S., CALL TOLL Telephon ( ) Ext. withstand the extremes of humid - FREE (800) 426 -0361. (For resi- PE: 8 7) *U.S. Price Only www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 9 a

NEW MARK III e- Stge Collars L ova ». .,..,..!=+- -- Stereo level indicator prints upper- and lower -case, double -size, ,,_.-.\--4::....., kit with arc -shape dis- and double- spaced characters to allow play panel!! This Mark III LED level indicator is a '01111111.,'-'44w new design PC board with an arc -shape 4 colors *IOWspecial effects such as titling pages and LED display (change color from red, yellow, green printing headings. Automatic and the peak output indicated by rose red). The "wrap- power range is very large, from -30dB to +5dB. around" prevents data loss due to overflow The Mark III indicator is 1 applicable to watt - when text exceeds maximum line length. 200 watts amplifier operating voltage is 3V - 9V DC at max 400 MA. The circuit uses 10 LEDs Printer software is selectable for 16 or 32 per channel. It is very easy to connect to the amplifier. Just hook up with the speaker output! and tern 1d). lines/ IN KIT FORM $18.50 New Products minute (64 characters /second). The 96- character, 5 x 7 dot -matrix characters Additional information on nest' products 60W + 60W are a modified ASCII subset. Vertical spac- cnrcred in this section is available from the STEREO AMPLIFIER ing is 6 lines /inch. All 32 ASCII codes manufacturers. Either c'irc'le the item's code can nunther on the Free Information Card be produced, as well as codes for the print - or strife to the manufacturer ut the ed characters. Although designed for use address given. with Radio Shack's Level II TRS -80 sys-

1 *4- ' '. tems, the printer can also be used with oth- 'N. er computers. Measures 91/4"W x 63/4 "D x ft ..t , 35/16 "H. $219.00. KEF Model 101 CIRCLE NO.89 ON FREEINFORMATIONCARD Loudspeaker COMPLETED UNIT -NOT A KIT! OCL pre amp. & power stereo amp. with The Model 101 loudspeaker by KEF Elec- bass, middle, treble 3 -way tone control. tronics has a total volume of only 0.25 cu. Fully assembled and tested, ready to work. Digital ft. and is Total harmonic distortion less than 0.5% designed for bookshelf place- at full power. Output maximum is.60 watts ment. A computer is used to match the two Capacitance Meter per channel at 8 S2 . Power supply is 24 - 36V AC or DC. Complete unit A new digital capacitance meter has been Assembled $4950 ea. introduced by Data Precision Power transformer $ 8.50 ea. 6 Corp. The * 31/2 -digit Model 938 has a rated measuring SW AUDIO AMP KIT 2 LM range of 0.1 pF to 1999 14F in eight switch- ili)))1 380 with volume control " 1 p../, suoply 6,-18V Dc able ranges, with a basic accuracy of __ ONLY $6.00 EACH -- 0.1%. Range selection is via pushbutton 100 W CLASS A POWER AMP KIT switches handily located along the left side Dynamic Bias Class "A" circuit design makes this unit of the case. A zero- adjust control with a unique in its class. Crystal clear, 100 watts power output -t 20 pF range is provided will satisfy the most picky fans. A perfect combination 8 for compensat- with the TA 1020 low T.I.M. stereo pre amp Specifica- tions: Output power: 100W RMS into 8 ohm /125W RMS into 4-ohm Frequency response: 10HZ 100KHz T.H D.' r, less than 0.008% S/N ratio: better than 80d8 Input son. sitivity: IV max. ,,-" Power supply: ,. Y " +40V @ 5 amp. drivers -a 25 -mm (1 ") tweeter and a 110- , TA -1000 KIT - $51.95 .4-s _ mm (414 ") woofer -and the crossover net-

Power transformer ye . work as well. The speaker is rated to ac- %: i 515.00 each ! - 1 v cept the output of an amplifier up to 100 <' - LOW TIM DC STEREO PRE -AMP KIT TA -10 -20 watts and has an automatic protection sys- --....) .(s Incorporates brand -new D.C. design that gives a frequency tern to prevent overdriving. Maximum out- response from OHz- 100KHa ±0.5dB1 Added features like tone defeat and loudness control let you tailor your own put level is said to be 98 dB SPL. Sold in ing for stray capacitance frequency response. Independent of test leads. I.C. regulated power sup- matched plies to eliminate power fluctuation! Specifications: THD pairs with teak or walnut finish Measurements appear on a 0.5" (12.7 - less than .005% T.I.M. less then .005% Frequency re- a sponse: DC to 100KHz ±0.5áB RIAA deviation: ±02áB and brown fabric grille. mm) high liquid crystal display. An internal S /N ratio: better than 70dß *Sensitivity: Phono 2MV CIRCLE NO. 88 ON FREE INFORMATION CARD fuse 47K /Aux. 100MV 100K Output level: 1.3V Mex output: prevents instrument damage from 15V *Tone control: bas charged capacitors and should the test ±10dß @ 50Hz /treble !10dß @ 15Hz Power leads be inadvertently connected across a supply: ±24 D.C. @ 0$A .+ ax Kit comas with regulated voltage source. Uses a single 9 -volt alka- power supply, all you line battery. $149.00 ` need is a 48V C.T. trans- -- former@ 0.5A Low-Cost CIRCLE NO 91 FREE ONLY $44.50 ON INFORMATION CARD X'former $450 µC Printer WE SELL ALL KINDS OF Radio Shack has introduced an inexpen- ELECTRONIC PARTS & KITS sive printer that produces low -cost hard PL EASE SEND $2.00 copy on 2344' (60.3 -cm) wide aluminum - AM /SSB Mobile FOR DETAIL CATALOGUE coated paper. The TRS -80 Quick Printer II YOU MAY FIND OUR 2 -PAGE AD CB Transceiver IN EVERY ISSUE OF RADIO ELECTRONICS The Model 7001 is the most precise AM/ SSB CB mobile RETAIL STORE OPEN TO PUBLIC transceiver in Midland's MONDAY THRU SATURDAY Precision Series. It features: RF ATTenua- 10 a.m. -7p.m. °'.rwe -en tor switch; RF GAIN, CLARIFIER, SQUELCH, 4114 FORMULA INTERNATIONAL INC. and MIC GAIN controls; LED transmit/ 3,i012503 CRENSHAW BOULEVARD HAWTHORNE, CA 90250 receive (Tx /RX) indicator; DIM, CB /PA, LSB/ (213) 679 -5162 or (213) 973 -1921 '-: AM /USB mode selector, NB & ANL, and All items subject to prior sale. TONE switches. A two -digit, green seven - Prices change subject to without notice. (Continued on page 12) 8 CIRCLE NO. 23 ON FREE INFORMATION CARD POPULAR ELECTRONICS

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 10 It's a digital signal injector. And it thinks for itself.

Itrnav look like a logis Drobe .. . but oL DP -1 Digital PLIser is a lot more unique. This iandheld, circuit-powered iistru ne^t s actually a miniature pulse generator built to soeed digital troubleshooting. Much it to a c ircu t, and DP -1 automatically senses the logic state. So when you push the outtcrn, out comes ale perfect pulse -preset to the logic family you're wo -king with - of the proper polarity to force the state the otnerwas. Hold the button down for a secsme and it starts injec-ing a 100pps pulse train. Wit all the punch you need -up to 100 mA. Tnirk wiat a help tf-a: can be when yoi logic circu t is coing something illogical. (And just case you do sornetning illogical, weve included reverse- pola'i :y and short -circuit pro - 1ection, as %ell.) Ifssma -ttosave *Tie wit a DP -1. At $74.95 *, its a smart b_iy, too. Smarter tools for testing and design.

CONTINENTAL SPEIALTES coWO6n1ON

70 Fulton L=rrace, tkr Haven, CT 065)9 (2)3)624-3103, TWX 710-465-1227 )THER OTICES Sal Francisaa (415: 421-88'2, TWX 910-372-7992 TLX 817477 Europe : CSC IX LTD Phone Saftron-Walder 0'99-21682, )anada _en F rer 1d.. Ontario Call toll-free for detail 800- 243- 6077 'Suggested US resae. Available at selected local distributors. Prices, seci*®tlone subject to change witrout notice. ® 1979 3ortrienta Specialties Coroorabor CIRCLE MO. 130N FREE INFORMA-ION CG. RD

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 11 The craftsmen at RealtiméM have done some- And because of Realtime's "PM" indicator, thing quite unusual. They've created a dramatically you won't be setting your alarm for the thin, rugged alarm chronograph for under $250. evening when you had intended to set it for the In fact, way under $250. morning. And while they've trimmed their timepiece's Is it Monday in New York? Or Tuesday in profile to a slim 9mm, they have done it without Hong Kong? You'll never have to ask that question sacrificing a single feature, or compromising quality. We have yet to see an alarm Switches chronograph Continuous display of chronograph that from normal time mode TIME MODE. hours, minutes and even approaches the value of this to stopwatch opera- seconds for two time superb new prod- tion ("ST"), to second zones. In second time uct, either in a store or offered through the mail. time zone ("T2 "), to zone mode, "T2" flag alarm setting ( "AL "). appears. Microcomputer technology pushed to This flag comes Rolls off every the limit. on with second second. Or changes It's truly remarkable the amount of information time zone data to the date. Built -in and alarm 4 -year auto calendar you can now carry on your wrist, especially when setting. adjusts to end of month. Flag shows correct Flag shows alarm set. you consider it's within a piece of jewelry no bulkier day of week This audible reminder in each time zone. beep -beeps for 1 than an ordinary, slim wristwatch. Appears SPLIT minute between ráe ÌLE RESET on the exact 12 noon and mid- minute of its setting. It With this chronograph, you have bright liquid night in normal returns 24 hours later. time mode. Also crystal digits always telling you the time of day. works in conjunc- Resets time, date, tion with alarm alarm, day of week In hours, minutes and seconds (with accuracy to setting. and month. Also silences alarm. ± 5 seconds a month). Even when switching back for a ODE START time check, STOP Starts and stops stopwatch AL APIA What's more, you can even program the hours, function con- CHRONO the count. If tinues uninterrupted. depressed minutes and seconds for any other time zone you Events can be timed for during split up to 12 indicated hours. Ì,±fnF-rr,t time display, wish for immediate recall, thanks to Realtime's dual Beyond that, hour display freezes the starts over at "1" without count - time -zone feature. interruption. V4"477"4 allowing SPLIT automatic Realoma RESET Colon flashes when split changeover 5 POPULAR ALARM CHRONOGRAPHS COMPARE THINNESS. time is displayed. Indi- to total cates time is still elapsed time accumulating. display. Moving flag records 1/10 esets stopwatch to seconds. Face shown reads: STOPWATCH MODE. zero for next event. Also 9 hours, 59 minutes and activate 6- second split time 36.4 seconds. display anytime during the count. Texas Instruments (5125) 12.00 mm Advance ($100) 11.5 mm Citizen (5225) 11.0 mm Seiko ($250) 10.5 mm again. The day of the week is always displayed. To Realtime (599) 9.0 mm see the date, simply flick a button. When the sun's down, press another and the Realtime's face is It's a multitalented wrist alarm too. You may set instantly illuminated. it to beep -beep you in both time zones and at precisely minute you choose " FINALLY. ANALARM ALL FUNCTIONS

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 12 And just as quickly as you recalled the date, Water? Don't you worry. you can set into motion a full -featured stopwatch. The Realtimés face crystal isn't plastic like most By the way, this stopwatch doesn't just count to 59 chronographs you see. It's tough rock crystal. minutes like many other chronographs do -but up And not only is it hard enough to resist scratches, to 12 hours or more. It also precisely cleaves every but it is fitted so tightly to the case that the chrono- second into tenths. graph has passed water immersion tests of up to You may record split times, lap times 100 feet. We know of no other chrono- or freeze the figures anytime. graph-at any price -that can offer You may even alternate between you this security. your stopwatch functions and This chronograph also has no moving normal time ones without con- parts to break down, and it is unlikely that cern; by activating one mode, servicing will ever be required even after you don't interrupt the other. years of hard use. It comes with batteries in place (easily changed by any jeweler), a one - $99 buys an y ear factory warranty from its manufacturer, honest design complete instructions, convenient service -by -mail We wish you had a Realtime facilities right here in the U.S., and The Sharper alarm chronograph in your hands Imagés own guarantee to customers: if for any right now. You'd see and feel the differ reason at all, you are not completely delighted with ence a 100% solid stainless steel case makes. (Most your purchase, please return it within two weeks for other comparably priced chronographs are chrome a complete and courteous refund. plated and not solid stainless.) Realtime's back and bracelet are also solid stainless. And every one of ORDER NOW. TOLL -FREE. those bracelet links is double stamped to produce the exact size and taper required. Each link is then Credit card holders may use our toll -free order- ground and polished. (We defy anyone to find working number, for quickest delivery. Or send check manship like this, elsewhere at this price.) for $99 plus $1.50 delivery. Add $5.94 tax in CA. You'll also notice there's no front speaker grill (800) 227 -3436 on this alarm chronograph; it doesn't need one. The In California (800) 622 -0733 alarm sound emanates from the rear of the case. Many other chronographs, in trying to look like THE SHARPER IMACE Seiko with its front - mounted speaker, cleverly paste 260 California St , Dept. RA- front grills. These are functionless; they San Francisco, CA 94111 on printed (415) 788 -4747 are just imitation. Everything you see on your Real - ©1979 The Sharper Image time chronograph is there for function, nct for show. CHRONOGRAPH WITH AND NO FAT.

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 13 The Best NEW PRODUCTS (Continued segment LED display shows the channel Deal tuned, and a large illuminated meter dis- In plays relative signal strength and transmit- Car Stereo ter output power. Specifications: less than

chined steel drive gears, dual transformer Our FREE Catalog 0.7 pV for 10 dB (S + N) /N sensitivity; 60- circuitry, power braking, a control unit with dB adjacent -channel selectivity and de- The 76 page CRUTCHFIELD illuminated meter readout, and low- voltage sensitization; 3 watts at 10% distortion au- catalog is nationally recognized operation. $224.95. as dio output power into 8 ohms; 4 watts max- the best source for car stereo imum, 3.6 watts minimum carrier power product and installation informa- with no modulation; -65 -dB spurious tion. It contains all you need to emissions; -40 -dB transmitter, -45 -dB receiver know to buy and install the ideal hum and noise. $319.95. Bose Spatial -Control CIRCLE NO 920N FREE INFORMATION system for your car. CARD Receiver And it's FREE! Act now and Designed to complement Bose 901 Direct/ you'll have it in just a few days. Reflecting speakers, but usable with other Compact Electric speakers as well, the Spatial Control Re- Over 200 car stereo products at dis- Drill ceiver contains equalization for the 901's count prices Wahl Clipper Corporation's "Iso -Tip" is a and "source and room compensation" compact electric drill that's said to be ideal All the specification, dimension and controls that function in lieu of tone con- for circuit board revision, solder removal, feature charts you'll need trols. In addition, it is capable of directing mid and high frequencies to either the in- The best products in car stereo, inner or outer banks of reflected drivers cluding Blaupunkt, Clarion, Craig, of the 901's, narrowing Concord, Jensen, Marantz, Panason- or widening the stereo ic, Pioneer, Sanyo, and many more! image at the listener's option. Bass is directed equally to all drivers at all times. Illustrated installation articles The unit contains four main power amplifiers Fill out the coupon and send right away and two secondary amplifiers for driv- for your FREE catalog. Or if you can't ing headphones. Strapped in pairs, the wait, call TOLL -FREE: large amps are rated at 100 watts per channel into 8 ohms, 20 Hz to 20 kHz, with - no more than 0.09% THD. The FM section 800 446 -7924 is said to achieve In Virginia call 800 -552 -3961 50 dB of quieting in stereo with an input signal of just over 36 Illustrated. Pioneer's new KE -2002 in -dash -tom AM /FM stereo /cassette car stereo dBf. $799. featuring electronic tuning and and lead hole cleaning, among other jobs. CIRCLE NO 94 ON FREE INFORMATION CARD high fidelity specifications. It runs at about 9000 rpm and TS-168 6'. " three -way accommo- speakers with expo - dates drills and burrs with shank size up to nential horns. /d'. Less than 5" long (excluding drill bit), N? NEER the Iso -Tip is small enough to use at close Anixter -Mark quarters. The device is housed in high- Impact plastic and is equipped with CB Antenna Upgrader I a 10' YES! power cord, as well as a collet chuck, four Anixter- Mark's "Little Devil" adapter is de- Rush me a collets and two drill bits. signed to allow CBers to upgrade to a high- I FREE Catalog CIRCLE NO. 93 ON FREE INFORMATION CARD er-performance antenna without requiring by First Class Mail I a new mount or cable assembly. The base loading coil merely unscrews from the Name ' present antenna and the Little Devil Address I Antenna Rotor I City System I Stare The new Ham IV from Cornell -Dubilier Electric Corp. is an antenna rotor system I CRUTCHFIELD for large communication arrays with maximum wind load areas of 15 sq ft when tow- I Crutchfield Park, P.O. Caller I, Department E Charlottesville, Virginia 22906 er mounted. Includes such features as ma- - - - - m - (Continued on page 14) 12 POPULAR ELECTRONICS

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 14 Using a computer is easy... for onComputing readers. The editors of onC omputing realize new in personal computers, where Read onComputing that much of the material written to buy a personal computer, and - to find out .. . about computers is not at all suited how to use it. to the person who just wants to is totally new What a micro- use a computer as a tool for busi- onComputing a ness, education, home entertain- publication. It is issued quarterly can do and contains articles from some of computer ment, laboratory work, or other as is dedi- the best known names as well applications. onComputing amateurs. It is How to get started cated to helping the computer user from competent of a edited and produced under the guid- understand the capabilities of in non -technical ance of an experienced staff microcomputer- The articles in What's new in language. computer experts. onComputing have never appeared personal They are onComputing is entertaining and in any other publication. computers all fresh, informative, and valuable informative. It contains practical in on how to get started, in- reading for anyone interested articles fun or profit! Where to buy cluding what you'll need for your using a computer- for application and what it will cost. your computer It features book reviews, product onComputingCOMPUTING reviews, information on what's TO PERSONAL How to use your GUIDE computer Start your subscription today.

onComputing Subscription Department, P.O. Box 307, Martinsville, NJ 08836 EVERY THREE MONTHS rate. onComputing will bring REGULAR subscription a Canada & Mexico 1 yr. (4 issues) $10.00 the latest develop- U.S. 1 yr. (4 issues) $8.50 ments in the field of FOREIGN (to expedite service, please remit in U.S. funds drawn on a U.S. bank.) personal computing: Europe (and ail other countries, except above) 1 yr..á $12.00 - surface delivery use, applications, books, Bill VISA Bill Master Charge Bill me (North America only) all in an selection - Expiration easy -to -read style. Card Number

Signature Name (Please print)

onComputing, Inc. 1979 Street/Apartment Number

City State /Province /Country Postal Code 7389)

CIRCLE NO. 11 ON FREE INFORMATION CARD 13 AUGUST 1979

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 15 grandfather's Clock_`Was NEW PRODUCTS (Continued)

cWeveY `Lilt,e This ! screws into its place. All of the popular accessories can be used with the Little Devil. Sansui Integrated which has a 41 " -24 thread. The mount and Amplifier cable from the old antenna installation can still be used. saving on that part of the sys- A slew rate of 200 V /microsecond (said to tem. The adapter can be used with both reduce transient intermodulation to vanish- trunk and lip mounts. ing point) is given as one of the premier CIRCLE NO 95 ON FREE INFORMATION CARD specifications of the Sansui AU -919 integrated amplifier. The direct -coupled amplifier. which is equipped with protective circuitry designed to limit dc at speaker ter- Programmable minals to a safe value. is rated to deliver at Clock Radio least 100 watts per channel to an 8 -ohm load, 5 Hz to 20 kHz, with no more than General Electric announced the first AM/ 0.008% THD. The phono equalization am- FM programmable digital standard broad- plifier of the preamp section includes in- cast clock radio, "The Great Awakening" puts for moving -coil and fixed -coil pickups. Model 4880. It has a programming key- With the latter, it is said to yield a signal -to- board for entering a variety of time and op- noise ratio of 90 dB. Rated accuracy of EO erating functions. For example, two people is - 0.2 dB, 20 Hz to 20 kHz. $800. CIRCLE NO 97 ON FREE INFORMATION CARD

Desoldering Tool can wake up at different times to different for Mini -Boards stations without resetting. or the two sys- Hunter Associates is offering the Model tems can be used for weekday /weekend GSS Desoldering Tool, which is intended wake -up times. Further, one can fall for use on miniature and microminiature asleep listening to one station and wake up circuit boards and modules. Operating by to a completely different station. Memory capability to store six radio stations. instantly recallable by touching a button. is If you love contemporary design but want built in. Also all timekeeping and memory the more traditional, here is the clock for you. information is protected by In creating our own version of the ever popular battery back -up during power Grandfather Clock, we use the electronic eye outages. $116.95. to display each second, minute, and hour, and CIRCLE NO 96 ON FREE INFORMATION CARD also the simulated pendulum motion. The diagonal model which has no simulated pendulum is available for wall mounting or with base as a desk clock. Automotive Speaker means of compressed air, the tool creates Our synthesized sounds composed of tic toc, suction in its tip, with the high- pressure air modified Westminster Chimes and Bongs are Adapter flow causing a continuous self-cleaning ac- available for any AMELECT clock. The chimes tion as well. Air can be supplied either from and bongs are composed of six frequencies, East Coast Enterprises has introduced a pressurized line providing realistic bell sounds. They are totally "Adapt -A- Sound," a device that matches a or by an ordinary foot within clock cabinet. standard 6" by 9" automotive loudspeaker pump. The tool has a tip 2.4 mm in diameter with a 1.2 -mm vent. $39.95. The AMELECT clocks, cabinets may be to the 4" by 10" mounting locations provid- your choice of Cherry, Mahogany, Maple, or ed in some of the newer, space -efficient CIRCLE NO 980N FREE INFORMATION CARD Walnut hardwoods. Assembled Kit Base CL7401A Diagonal $79.50 $59.50 $9.60 Debounce Switch CL7402 Grandpa $99.50 $75.50 Chimes $45.00 $39.00 Cincinnati Electrosystems' new Debounce Switch provides a Shipping and Handling, $3.50 convenient method for clocking logic circuits without contact To order write or call bounce. A pushbutton switch, when operated, generates a choice Allow 4 to 6 weeks for delivery of positive or negative 10 -µs pulse or a level change. This latest addition to the company's Black cars. The adapter is said to cause little or Box series of laboratory instruments meas- AMELECT no loss of sound quality. A snap -in mount- ures 4" 27." ' 19/16" (102 y 73 40 ing spring designed to fit all 4" by 10" loca- mm). II is designed to be powered from vir- I N C O R P O R A T E D tions is claimed to simplify and facilitate in- tually any 5- to 15 -volt external dc source. Postoffice Box 367 stallation. Address: East Coast Enter- $7.95. Address: Cincinnati Electrosystems prises. Inc., P.O. Box 639664, Miami, FL Inc., 469 Ward's Corner Rd., Loveland, OH GOODLAND, INDIANA 47948 33163. 45140. Phone 219 -297 -3320 14 POPULAR ELECTRONICS

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 16 Incorporated. AKAI STEREO COMPONENT CATALOG systems is offered by Antenna new antenna Akai's 56 -page catalog describes its full line The catalog includes several material in of stereo components, including tape decks, models and provides reference match turntables, receivers, amplifiers, tuners, loud- chart format, enabling the reader to model number speaker systems, an equipment cabinet, a antenna frequency range and mount. In- mic /line mixer and stereo accessories. The with the desired type of antenna 200 -watt low -band vhf catalog has information on product features, cluded are: 100- and 200 -watt, 3 -dB specifications, and color photos of each mod- antennas; 100 -, 150- and high -band vhf antennas; 100 -watt and el, plus a glossary to explain specifications gain, gain collinear uhf antennas; New Literature and provide stereo terminology. Address: 150 -watt, 5-dB heavy -duty mobile Catalog, Akai America, Ltd., P.O. Box 6010, 4- wavelength models; between 25 and 54 MHz; Compton, CA 90224. antennas for use "disguise" cowl -mount models and base sta- HEATH INSTRUMENT CATALOG ANTENNA INCORPORATED CATALOG tion antennas. Address: Antenna Incorporat- Described in a 35 -page catalog is the com- An expanded Land Mobile Antenna catalog ed, 26301 Richmond Road, Cleveland, OH plete Heath -Schlumberger line of instru- for commercial two -way communications 44146. ments. Included are: computer systems, dis tortion analyzers, frequency counters, generators, individual learning programs, testers, oscilloscopes, power supplies, recorders, TV service, and accessories. Products are illustrated and full specifications are given. Ad- dress: Heath /Schlumberger Instruments, Benton Harbor, MI 49022. DARE FOR ELECTRONIC WE NEWSLETTER GUITARISTS /MUSICIANS Device, the Newsletter for the Electronic Gui- tarist /Musician, is a monthly publication for musicians involved in today's technology. Co- edited by Craig Anderton and Roger Clay, subjects regularly covered include reviews of YOU musical equipment, construction articles, in- terviews, features on circuit design and read- Stop reading. And start listening. It's that simple. er opinion polls. Rates are $15 /year (USA), Even with today's tape technology, /Mexico) and $18 (Internation- $16 (Canada no such thing as an ideal tape for al). A free sample issue is available from De- there's vice, P.O. Box C. Carmichael, CA 95608. every machine. Only what's best for you. Which depends only on the sound you like and the response of GOULD OSCILLOSCOPE BULLETIN your deck. Rugged, lightweight professional oscillo- Compare specs if you wish scopes with standard features usually found - In more expensive instruments are described we'll match ours against anyone in a new four -page illustrated bulletin from else's. But we honestly think Gould. The listing includes three dual -trace you'll be more impressed by and one true dual -beam scopes that range in comparing the sound of our`' a free price from $595 to $995. For copy of FX -I or II to that of any Form No. 449 -7, contact: Marketing Services, Gould Inc., Instruments Div., 3631 Perkins other premium cassette. Ave., Cleveland, OH 44115. Visit your audio dealer and take the Fuji challenge. RADIO SHACK MICROCOMPUTER CATALOG The TRS -80 Microcomputer Catalog #RSC -2 is offered by Radio Shack. The 20- page catalog includes current information on the TRS -80 microcomputer, its peripherals and accessories with descriptions, application ideas and specifications. A general sec- a computer is, what it can tion explains what Magnetic Tape Division can use the TRS -80," and "Why do, "Who of Fuji Photo Film U.S.A., Inc. the TRS -80 ?" The catalog then describes the 350 Fifth Avenue, TRS -80 System, Level -1 and Level -II Basic New York, New York 10001 Language, and the peripheral equipment available for use with the TRS -80 including its expansion interface, Mini -Disk System, printers, interfaces, manuals and TRS -80 System

Desk. Address: Radio Shack, 1400 One CIRCLE NO. 24 ON FREE INFORMATION CARD Tandy Center, Fort Worth, TX 76102. 15 AUGUST 1979

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 17 Now NRI makes it TV/Audio home

Side -by -side to be a problem. Catalogs are radically One Million Students, equipment comparison different and some are not too clear as to Over 65 Years' Experience of NRI and two what you actually get for your money. So So we can only other leading schools tell you what NRI NRI has done a lot of the work for you. has to offer. We've been in education shows what you get And put the prices right up front so you since 1914, starting as a radio school for what you pay. six can make your own judgment. years before commercial broadcasting When you have to pay Of course, we can't compare every- was even on the scene. Since then, we've as much as $905 more thing. Lesson clarity and content vary. for kept right up with the times, improving another school's course, What one covers here, another covers techniques, adding you should carefully material, creating there...or not at all. The material one new courses to help people improve their consider your tuition school breaks down into eight lessons skills and investment. income. may be four at another. And the qualifi- Early on, we learned to keep our When you sit down and try to pick cations and abilities of instructors are lessons compact...thoroughly covering a out the school that's best for you, it gets another question. subject, but not so much that students would be overwhelmed. We call them NRI SCHOOL A SCHOOL B "bite- size" lessons because they're easy COURSE TITLE Master Course in TV, Audio, Master Course in Color TV Electronics 7èchnology and to digest. and Video System Servicing Servicing Advanced 1Youbleshooting I & 11 Learn by Doing with "Hands -on" Training CASH PRICE $1,375 $1539 $2280 (terms available) And, we pioneered the concept of "hands -on" training. NRI goes far TV SET NRI designed- for -learning Heathkit GR-2001 25" Zenith model G4020W 19" kit. 25" beyond theory and textbooks to give our (diagonal) color (diagonal) color TV (diagonal) color TV (fully TV with built -in computer (cabinet extra) assembled) students actual bench experience and programming and cabinet prepare them for the realities of electronic OSCILLOSCOPE NRI servicing. Every piece designed- for -learning Heathkit 10-4541 5" Heathkit 10-4541 5" of equipment in kit. 5" (8 x 10 cm) (8 x 10 cm) triggered (8 x 10 cm) triggered sweep our Master Course in TV and Audio Ser- triggered sweep sweep (not given until vicing is after graduation) designed for learning. You build your own big-screen TV, COLOR BAR NRI designed-for -learning Elenco SG -200 (kit) Elenco SG -200 (fully the only one complete with computer GENERATOR kit. 10 patterns 10 patterns assembled) 10 patterns tuning that lets you program an entire FREQUENCY NRI designed- for -learning evening's entertainment... a solid -state COUNTER kit. Complimentary metal oxide semiconductor digital type

METER NRI designed- for-learning Heathkit (part of TV kit) Private label multimeter kit. Transistorized AC /DC DC only; 1K Ohm/volt volt -ohm meter

AUDIO NRI designed-for -learning Private label pocket transis- kit. Solid -state stereo tor AM radio kit and AM- AM/FM receiver with FM -SW solid -state portable cabinet and speakers radio kit

TRAINER NRI Discovery Lab Breadboard Experimental Electronics Lab

MISCELLANEOUS Digital logic probe EICO Digital Logic Probe EQUIPMENT built into TV set

All data as shown in each school's catalog as of April 1, 1979.

I.eam as you build with "hands-on" training.

16 POPULAR ELECTRONICS

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 18 easy to compare study courses.

stereo tuner and amplifier with speakers Send for Free Catalog ...your own oscilloscope, digital frequency No Salesman Will Call counter, and other instruments you use in Send for our free catalog today your course, use later to service TV's, and get all the details. See every piece of audio equipment, and video tape units. equipment and kit you get...a complete The point is, none of this equipment listing of fully described lessons...expla - is hobby -kit or commercial assembly line nations of each and every experiment you units with lessons "retrofitted" to what perform. Read about NRI's background was at hand. NRI has designed each so and qualifications...career opportunities you get invaluable training and experi- ...what NRI graduates say about their ence you just can't get any other way. training... costs and monthly payment As you build, you study operation of cir- plans for the courses that interest you. cuitry, see how sections interact, perform Then compare NRI value and results and "power-on" experiments only possible make your decision. Like the million with NRI. This total training is exclusive that have gone before you, we think Build and keep 2 -meter transceiver, test equipment For a communications career. with NRI...no other school, home study you'll choose NRI. Send the card today. or resident, offers it. Instructors Or check out NRI value-training Who Know Their Business NRI instructors are thoroughly in Computer or Communications/ qualified, with both technical and educational experience. Most of them helped CB Equipment Servicing. develop NRI courses, lessons, and equip- NRI's new Microcomputer and microwave, commercial broadcasting, , ment, so they really know what they're be the and more. NRI can help you as you build their Microprocessor course trains you to talking about. They're interested in digitally complete computer technician, at home and experiment with your own students, always ready to help with a software. As synthesized 2 -meter transceiver. For facts advice with both hardware and question, a problem... give good study you learn, you build your own advanced on these and other NRI home to help you reach your goals. get - courses, check the postage -paid card and like technology microcomputer, "hands It's instructors and training write to: on" experience in servicing and pro- mail today. If card is missing, this that have made NRI the choice of gramming. Or you may want to look into professional TV servicemen who have NRI Schools expanding world of communications taken home study courses. As a national the R McGraw -Hill Continuing ...mobile survey shows (summary on request), they Education Center radio, CB, 3939 Wisconsin Avenue NRI by a majority of three to recommend Washington, D.C. 20016 one over any other school. So how does NRI give you all this and still cost so little? We keep costs down by designing our own training kits, eliminating the middleman's profit on hobby kits or commercial units. And by offering our training by mail only. We have no sales force, no commissions to pay. You make up your mind in your own time, without pressure, let the facts speak for themselves. We pass these savings on to you in the form of lower tuitions, more equipment, carefully designed courses and effective lessons.

19 AUGUST 1979

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 19 Of course, this is not the sort of recording technique you use if you are trying to cover up deficiencies in the performance or flatter the sound in some way. What actually takes place is what the microphones hear and the tape preserves, Stereo Scene warts and all. Nor is it a technique that is easy to bring off in every environment. But if you accept the idea that the space By Ralph Hodges need not be a nice neat rectangle as long as your performing forces cah be squeezed into it, and if you realize in RECORDING AS NATURE INTENDED advance that the minimum number of microphones required is usually best, with additional microphones often prov- ing detrimental, you can usually manage something. 'T WAS to be a typical recording ses- the producer wanted to make sure the Here is a procedure I very often find sion (details of time and place are not brass did not drown out the strings, he helpful, although like everything in au- pertinent to this discussion), and once it had the engineer turn up the string dio, it is fallible. First consider the re- began, our little party of journalists took mikes -often to the point where the vi- cording environment, because it will de- just five minutes to zero in on the best olins became shrill caricatures of them- termine the character of the reverbera- seats from which to hear the orchestra. selves. With microphones sprinkled hith- tion present on the finished tape. A small What we heard as the music unfolded er and yon throughout the orchestra, auditorium, for example, is usually less was indeed magnificent. As I sat, spell- there were no landmarks by which a lis- reverberant than a stone church. This bound by the glorious sound, I could al- tener could get his bearings in the stereo means that microphones can usually be most visualize my own microphones image. Perhaps this was just as well, for placed a bit farther away from the per- hanging there just so far off the floor and a more plausible perspective that formers without loss of clarity. An advan- just the right distance from the front churned and twisted as this one did (be- tage can be realized here when working desks of musicians. cause of the continual changes in instru- with very few microphones, because a However, that wasn't where the mikes mental balance that were being dialed more distant mike means less variation were at all! For one thing, instead of the in), might have caused motion sickness. in performer -to -mike distance for any two or perhaps I three had visualized, The tympani were getting into all the mi- given performer and fewer problems there were some two dozen (neither the crophones, thus losing their crispness with balance. If the performers know producer nor the engineer could recall and much of the "snap" of their impact. how to balance themselves, the record- the exact number) and they were strewn It was discouraging to realize that this ing will be balanced. around the orchestra like raisins in a fruit sound was the product for which many A church may require closer miking if cake. The treatment of French horns dollars per minute were being spent, reverberation is not to interfere with clar- was particularly puzzling. Sound- reflect- when you could walk 30 steps into the ity. In this case, you might want to try ing panels had been erected a short dis- hall and hear how wrong it all was. more closely spaced mikes and group tance behind them; which seemed logi- the performers in an arc around them; in cal because the bell of the horn faces to Miking the Space. A reaction against other words, the "space" you're defining the rear and the back wall of the stage this sort of recording technique has now becomes a rough semicircle in- reflects the sound out to the audience. been underway for some time now. As a stead of a rectangle. These suggestions Since the recording team had brought concept it might be termed "miking the are perforce very general; every record- th'e orchestra off the stage and out into space." Instead of trying to pick up 40 vi- ing situation is a cut -and -try proposition. what would be the audience seating olins, 25 violas, 20 cellos, 10 string area -a very common practice in U. S. basses, 2 oboes, etc., you adopt the out- Setting Up. Once the mikes are orchestra recording -something was look that you're going to try to capturé roughly placed (and before the perform- needed to take the place of the stage's every acoustic event that takes place in ers arrive), send your assistant to stage enclosure. What seemed less logical an area of, say, 80 by 40 feet-the sort center and have him move forward and was thai the mikes were not in front of of area a symphony orchestra might oc- back, continuously announcing his dis- the horns but behind them, a few feet cupy. The nature of the acoustic event tance from an imaginary line connecting away from the reflecting panels. Now if doesn't matter -it might be a concert of the microphones. When the monitor sys- God intended the French horn to be music, a tap -dancing competition, a tem yields what seems to you the most heard with its bell pointing away from the game of dice, or a fly buzzing around. pleasing balance between the sound listener or the microphone, what were What matters is that the event as record- coming directly from him and the rever- mikes doing behind the horns and in line ed sounds natural; that it seems to occu- beration his voice sets up in the environ- with the bell openings? Certainly the py the amount of space that it did in real- ment, you've established an approxi- sound in the control room did nothing to ity; and that its aural perspectives are mate "subjective distance" for the per- throw light on the matter. preserved. If something is happening in formance- subjective because you will I suppose I have heard worse ema- the rear or over to the left, the sound usually find that he is somewhat closer nating from a set of monitors, but that's should come from there when the fin- to the mikes than he sounds to be. Have not saying much. When, for example, ished recording is played back. him mark his positiori on the stage floor 20 POPULAR ELECTRONICS

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 20 POLICE RADAR MEETS ITS MMCII. synchronous detector to reduce power consumption to a minimum and provide a more stable gain setting- features usually found only in units costing twice as much. Two Warnings You Can't Miss. The GUL uses a double warning system. Both a tone and light come on in the presence of radar. And both remain on until radar is gone. You're never lulled into a false sense of security by a tone that sounds once and then goes off. And you can control the tone with a front - mounted on /off switch. Quick Installation. The GUL detector is one of the most compact units available, measuring only 4 "x3 °x4'/2 ", And weigh- ing just 20 oz. Its aluminum case is finished in glare -free matte black and comes with its bracket in place. A goon driving record makes for lower insurance rates and prevents possible loss of your driver's license. To mount, simply take the adhesive With GUL's Micro Scan, you GUL can help protect yours. It may even pay for itself off the back, and within the first year of use, depending upon your Velcro pad, peel can own a high- technology driving habits. adhere it to the top of your dash- radar detector for only $79. The bottom of the bracket optimize GUL's sen- board. Your radar detector should do knob lets you has a matching Velcro foot which both city and country two things well: give you as much sitivity for anchors your unit securely on top of conditions. advance warning of police radar as the dash. It plugs into your cigarette possible, and screen out false Doesn't Cry "Wolf." lighter. That's all there is to it. The signals. And few competitive units The GUL takes full advantage of same Velcro mounting also allows are able to perform both these modern integrated circuit tech- for easy removal in seconds to functions well. However, the GUL nology to provide a capability of prevent theft. The small size GUL G -73, developed by B.E.L. Labora- more than 100 transistors. Many will fit into any glove compartment. tories represents a breakthrough in competitive units try to get by with both sensitivity and false signal Try It Yourself. the new GUL detector rejection in a compact, well - Order designed case. today. Better yet, road test it yourself. See how comforting it is to Road Superiority. observe police radar when it's ob- The 10 -year researched GUL serving you. If you don't find it to be has been tested numerous times the best electronic counter- intelli- against such units as the Fuzzbuster gence you can have for $79, simply XK XK, the Whistler XK and the mail it back. Your GUL comes with Snooper. In separate tests conducted The Sharper Image two -week return by the Canadian Tire Corporation privilege and a manufacturer's and Motor Consumer Report, the 120 -day warranty. GUL demonstrated a detection distance significantly greater on both X ORDER NOW TOLL -FREE and K bands, than all three competi- as few as 20 transistors and they just tors. Its nondirectional elliptical horn don't work as well. GUL's sophisti- Call the toll -free ordering number antenna receives these signals from cated circuitry is completely Pelow and charge it to your credit front, back, and sides, and is even shielded by a diecast and extruded ird,or send check for $79 plus sensitive enough to detect the new aluminum case. This not only ,? 50 delivery (add $4.74 tax in CA). short pulse KR -11 radar. Signals of provides a better wearing case than -3436 ones, but also (800) 227 less than .01 millionths of a volt the often used plastic *'-- In California (800) 622 -0733 (ranging from 9.445-24.445 GHz) protects the input terminals from are sufficient to trigger the alert stray signals, the most common THE SHARPER IMAGE- signal and provide valuable warn- cause of false alarms. In addition, 260 California St., Dept. GL- CA 9401 hills the GUL uses an internal voltage San Francisco, ings when approaching and (415) 788-4747 curves. An adjustable gain control regulator, commutating filter, and c 1979 The Sharper Imagt,

21 AUGUST 1979 www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 21 with a strip of that indispensable silver The Inevitable Little Things. By there was a hitch -the orchestra was tape. this time you should be in pretty good going to be on tour on the date for which Then, while he faces forward and shape for the arrival of the performers, the session was scheduled, and the en- talks continuously, have him move who left it is to be hoped will give you a few gineers knew nothing about miking the and right on a traverse that approxi- minutes of run -through so you can set fi- hall in which the recording would have to mately encompasses the width you ex- nal balances. If the environment is re- be made. Worse yet, there was no time pect the performing group to occupy on verberant and you have had to mike fair- to experiment. stage. If at any time during his traverse ly closely, you-may find that sibilants are This was an intimidating state of af- his voice seems to recede, have exaggerated him in vocals. Raising the fairs because recording engineers and move forward until the original mikes sense of somewhat and instructing the per- the particular hall had had a long history distance is restored formers and mark that posi- not to sing at the mikes but in- of enmity. Engineers had found the tion with tape. (And, stead of course, have him straight out into the presumed au- place prone to echoes, lack of clarity, move back appropriately dience is if his voice the usual remedy. unfortunate balances, and almost any seems to approach A frequent the microphones.) problem that can be baf- other sonic ill you can name. The only When this process is over you fling unless will have you're prepared for it is the statement that could be made in the established initial a base line for the front row sound reflection that comes from hall's favor was that expert listeners of performers. the performer, Ultimately you'll be able caroms off the floor just in have long found it to be one of the most to move them slightly forward front or back of of him, and reaches the micro- thrilling and satisfactory environments in this line to establish final balances. phone an instant after the direct sound. the world for listening to symphonic mu- Finally, your assistant As a rule should cavort this is the strongest reflection sic. In the end, not knowing what else to around the performing area stamping you'll have to deal with, and it can have do, the engineers hung a single micro- his feet, clapping his hands, and making an appreciable influence on the sound. phone above the orchestra on stage and as much noise as possible, but never The easiest remedy is a sound absorber crossed their fingers. stepping forward of the base line. As he at the exact bounce point. Church - The recording that resulted was pecu- does his act, you should get a vivid pew cushions can be highly recom- liar in a number of respects. The strings sense of continuous movement mended within a as absorbers. Do not, however, sounded like strings instead of strident well- defined space. The overdo space may not the treatment at first. Start with a implements of aural torture; you could sound quite like the area blocked out on single cushion at the bounce point - sense that the brasses could totally stage, but it should seem plausible. which can be easily worked out when overpower them unless held in check by you consider that the angle of reflection the conductor; and the instruments in will equal the angle of incidence -and the back of the orchestra actually sound- work up from there as necessary. ed more distant than those in the front. If the performance calls upon the per- The bass drum was a special revelation; formers to move -or if they move when it went off, you knew something whether required or not -you have a * FREE! had really hit you -right in the gut. In special problem. Practical stereo micro- short, the record had a signal on it that phone setups simply do not respond to actually managed to represent a sym- movement as two ears attached to a hu- phony orchestra with some plausibility. man head do. To get the most natural - And this recording sold -not immedi- sounding effect, you will probably have ately or in great numbers, but strongly to discuss their movements with them in and steadily. The company, convinced it advance, using the subjective- distance had discovered a hitherto secret love af- base line as a guide. Even then there fair between the American record -buy- are likely to be difficulties. ing public and Swan Lake, some years later issued a two -LP stereo set of ex- ... and it works. You may not be- cerpts played by the same orchestra. lieve it now, but with luck, application, This time, however, the engineers were NEW CATALOG OF and a mere two microphones, it is possi- on familiar ground and were able to fuss HARD -TO-FIND ble to get startlingly credible and satis- around with mikes and mike placements factory results with this basic technique, to their PRECISION hearts' content. Imagine their TOOLS as many brilliant tapes produced by per- surprise when the new, much more lav- Jensen's new catalog is jam -packed severing amateurs have shown. Even ishly produced recording didn't sell. with more than 2000 quality items. large- studio professional recordists, As adamant as my ears may be on Your single source for hard -to -find pre- who sometimes seem incapable of be- this point, I can't prove that the differ- cision tools used by electronic techni- lieving, have inadvertently proven it. ences cians, scientists, engineers, in recording technique alone ac- instrument Here, an anecdote mechanics, schools, laboratories and might serve. It may count for the wide variation in sales be- be apocryphal in some details, but I be- government agencies. This popular tween the two versions. But I suspect catalog also contains Jensen's world - lieve it to be true in the overall sense. that anyone who has no investment in famous line of more than 40 tool kits. Back shortly before the era of stereo, the status quo in recording will prefer the Send for your free copy today! a major label had proposed to do an LP results of simple miking over the multi - JENSEN TOOLS & ALLOyS of excerpts from Swan Lake with a well - mike "forest" technique, at least for 1230 SOUTh PRIEST DRIVE . TEMPE, AZ 85281 known orchestra. Evidently, the produc- classical music, given the chance to A BUSS A I AUGHLIN MU,v, tion was to be a quick and easy job just compare. If you have the opportunity, try CIRCLE NO.33 ON FREE INFORMATION CARD to fulfill contractual agreements. But it for yourself. 22 POPULAR ELECTRONICS

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 22 Julian Hirsch Audio Reports

made our basic measurements on the ST460 with the system's midrange and tweeter level controls in their 0 -dB (center) positions. The frequency response curve obtained in the reverberant field of our testing room was spliced to a woofer response curve taken with close microphone spacing. The latter includes the separately measured contribution of the port ra- diation at very low frequencies, corrected for the relative radiating areas of the port and the driven cone. As a rule, even a 12" woofer might be expected to show cone breakup, beaming, and other undesirable effects at an operating frequency as

high as 1 kHz. We were not too sur- prised, therefore, to find response ir- Fisher Model ST460 regularities and a general drop in output from the ST460's 15" woofer Speaker System beyond about 500 Hz. Maximum bass output was reached at frequencies between 70 and 90 Hz, steeply at lower frequencies. The Model ST460 rate three -position switches for adjust- falling off of the port is mostly at HiRS' from Fisher is ing the levels of the midrange and Contribution 1K)UKC frequencies below 40 Hz; while it is ef- a floor- standing high- frequency drivers over a range of a degree between 20 and 40 three -way speak- 3 dB. A pushbutton near the con- fective to Hz, the average output in this octave er system whose trols resets the circuit breaker that is far below that of the upper -bass. salient characteristic is high efficien- protects the system against over- Above 100 Hz, the output dropped off cy, which permits it to develop very loads. The front of the speaker is cov- smoothly and gradually to a minimum high output levels when driven by low - ered by removable, acoustically trans- at 1000 Hz of 10 dB below the max- to moderate -power amplifiers. Bass parent cloth. imum bass level. Beyond 1000 Hz, frequencies are propagated by a 15" We the output again rose gradually to (38.1 -cm) woofer that operates at fre- Laboratory Measurements. quencies up to about 1000 Hz, where a pair of 5" (12.7 -cm) cone -type mid- Performance Specifications range drivers take over. There is a second crossover at 5000 Hz to a single horn -loaded tweeter with a nomi- Specification Rating Measured ± Hz +5 dB nal 3" (7.5 -cm) mouth diameter. Both Frequency response 40- 20,000 Hz 10 dB 48-18,000 crossovers have symmetrical, 12 -dB/ 20-19,000 Hz +_10 dB octave slopes. Efficiency (avg SPL at 92 dB 92 dB

Overall size of the ST460 is 291/4" x 1 meter, 1 watt) 181/4" x 14 9/16" (74.3 x 46.4 x 37 Recommended amplifier 25 -130 watts Confirmed cm) and weight is 53 lb. Suggested re- power tail price is $389.95, or with genuine Peak distortion -free 112 dB Not checked walnut veneer finish as the Model SPL with stereo pair ST461 for $409.95. in typical room Crossover frequencies 1000 and 5000 Hz Confirmed General Description. The drivers Woofer diameter 15" Confirmed are mounted symmetrically on the Voice coil 2" Not checked front of the cabinet, with the woofer at Loading Ducted reflex Confirmed the bottom in its own approximately Midrange (size /type) Two 5" cones Confirmed 4 -cu -ft ducted -port enclosure. The two Voice coil diameter 9/16" Not checked midrange drivers are side by side Tweeter (size /type) 3" horn 2" mount diam. above the woofer with the tweeter Nominal impedance 8 ohms Confirmed centered above them. At the top of the Enclosure dimensions 291/4" x 181/4" x 149/16" Confirmed cabinet is a control panel with sepa- Weight 53 pounds Confirmed 23 AUGUST 1979

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 23 about +5 dB between 7000 and 16,000 Hz and fell off sharply at about ii1111®1íiÉ1iiiíi!li!!®iE 18,000 Hz. Overall frequency re- ®ffliglili® !'__®!!zi ® sponse (with the controls centered) Rissi CbMfP0S TE AuEn, M®liliY; 'A~dvrlidi' was ± 5 dB from 48 to 19,000 Hz, well ®!! : : ' ®lRá! within Fisher's ratings. Tweeter dis- 11É®l®il®®!! persion was quite good. 15®il H®9iYi!!i The ST460's high efficiency was mü= demonstrated by its ability to produce ®dzi®i a 92 -dB sound pressure level (SPL) at IEMBHUN a distance of 1 meter when driven by 2.83 volts of random noise in an octave centered at 1000 Hz. The tone - burst response was uniformly good, FREQUENCY (Hz) with no signs of prolonged ringing or Corn posit(' corrected frequency respo Ise for ST460 Speaker spurious output frequencies. Imped- System. ance averaged about 8 ohms, reach- with what we had measured. Occa- system's performance with classical ing a maximum of about 30 ohms at sionally, we experienced a heaviness music might not suit the most de- the 65 -Hz bass resonance and a mini- in male speaking voices and in some manding listeners, it is more than ade- mum of 6 ohms at 750 Hz. Bass dis- musical material. We attribute this to quate for its intended application. tortion at a 1 -watt input was less than the emphasis in bass response One characteristic of the ST460 1% from 100 to 50 Hz, and only 7% at around 80 Hz. Although some of the that will probably have a special ap- 30 Hz. At a 10 -watt input, distortion low- frequency performance is based peal to the rock and disco listener is measured less than 2% down to about on psychoacoustic illusion, it is con- its ability to conserve amplifier power. 50 Hz and climbed to 14% at 30 Hz. vincing enough to give an overall im- We were able to drive the system to pression of very solid bass. ear -shattering levels with a 20 -watt User Comment. We listened to a Clearly, the balance of compro- amplifier. On the other hand, the sys- stereo pair of the Fisher ST460 mises (a component of all loudspeak- tem took the output of a 200 -watt am- speakers mounted on stands that er design) has been tipped in favor of plifier right in stride. By most stand- raised them about 7" above the disco and rock music in the case of ards, the ST460 would not be consid- floor -an arrangement that, while not the ST460. The frequency response ered cheap, but if the potential saving critical, seems to enhance the sound gives a little extra "punch" to the bass in amplifier power is taken into ac- of many speakers. What we heard and "sizzle" to the treble, without count, along with the level of musical sounded clean, with a generally good weakening the midrange to an extent performance offered, it seems like frequency balance that correlated well that would cloud vocals. And while the quite an economical speaker. CIRCI F NO 101 ON FREE INFORMATION CARD

When Shure introduced the top -of- the -line Model V -15 Type IV phono cartridge last year, one of its features was a hyperelliptical stylus shape derived from the hyperbolic stylus previously developed for the M24H (CD -4) cartridge. This type of stylus has an extended contact area against the groove wall and a small radius that gives it excellent high- frequency trac- ing ability. It occupies the same position in the Shure products that the Shi- bata and its derivatives do in the lines Shure M95HE of other manufacturers. Stereo Phono Cartridge The new M95HE consists of an M95 body fitted with the new N95HE stylus. The diamond tip of the stylus is identical to that of the V -15 Type IV. The Model M95- filling the HIRSCH- gap between the moderately According to Shure, it makes a reduc- ED stereo car- HOUCK priced M91 series and the deluxe tion of as much as 25% in harmonic tridge has occu- V -15 series. Although priced only and intermodulation distortion com- pied the position slightly above the M91, the M95 car- pared to the elliptical stylus used in 4 just below the tridge was designed for a somewhat the M95ED. Since the M95 cartridge V -15 Type Ill in Shure's product line, flatter high- frequency response. is electromagnetically similar to the 24 POPULAR ELECTRONICS

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 24 V -15 series, it would appear that add- ®i111®11lliiE '' '+ ; : IIII®®ET=ijijjjE=IiiiiN ing the N95HE stylus to the M95 body MINiIMIERMEnum ®511®!®1/ =aii®il11111111®MIllfiNälMENN® lower price. ó 1®:®®®IQIiiÁ+iáp{p ®®,,°,E`E-éImir. The M95HE is designed to track at =1111/i101iiiii1 ®®®E11iiri11ii ®iiEMENiNliiBNt forces from 0.75 to 1.5 grams. Shure's iliEENEjjNl1N 111®®ii1®iiiai ®®NEMElEIMBET it a close 11111ji1NW=iNiFEI "trackability" ratings rank ii[iMiNi11I11 iE®i10EINiasiIN®®IPM®Aii1EMM1N second to the V -15 Type IV. Since the ®iÉ=,'sil: 5áB body is that of a standard M95ED, ii='iiiEiiiEREi`iENi=ii®®®=i1liPaM upgrade that cartridge can =®illi=ill1111®iragliniai10' owners of ®II381gMET.1ii2ll21We®i: to an M95HE at any time by merely

(H 1 plugging in a hew N95HE stylus as- FREQUENCY Cartridge. sembly. The M95HE costs $89.50, the Frequency response and crosstalk for M95HE Stereo Phono N95HE stylus $34.00. difficulty and separation was 28 to 30 dB with all but ERA III record without only a trace of "hardness " Laboratory Measurements. We the B &K record, which gave a 20 -dB revealing on the highest levels of the bells and tested the M95HE in the tonearm of a reading. At 20,000 Hz, the CBS and combined harp and flute sections of Thorens Model TD -115C record play- B &K records gave respective separa- 15 dB, while the ERA IV record. er at the maximum tracking force of tion readings of 17.5 and 1.5 grams. The electrical load was the JVC and Audio -Technica records User Comment. While it is easy to 47,000 ohms in parallel with 500 pico- showed a 22 -dB separation. distinguish between a low -priced car- farads. Shure recommends capaci- The low- frequency resonance in the tridge and a high -priced one by listen- tance between 400 and 500 pF, (more low -mass Thorens tonearm (14 grams ing or measurement, differences tend than most turntables and preamps effective mass, including the 6.3 become more elusive when com- supply), but response measurements grams of the cartridge) was at 10 Hz, to paring cartridges of similar overall with both values showed that 500 pF with an amplitude of about 7 dB. Consequently, we found no yielded flatter overall response. Tracking distortion was measured quality. audible differences between The cartridge's output was 4.75 with Shure's TTR102 (400- and dramatic Shure's M95ED and M95HE car- mV /channel at a 3.54 -cm /s velocity. 4000 -Hz intermodulation distortion) at tridges. Their measured performance Channel levels baianced within 0.9 and TTR103 (10.8 -kHz tone bursts rate) test records. was similar, too, although most of the dB. The vertical stylus angle, mea- a 270 -Hz repetition TTR102 in- differences did favor the M95HE. Of sured with a CBS STR160 record, The IM readings with the 2% or 3% at low levels course, we could not measure record was 26 °. Frequency response and creased from in the 22- wear, which should be appreciably channel separation were measured to 6% to 8% at velocities With the tracking lower with the greater contact area of with CBS STR100, JVC TRS -1007, to-27-cm/s range. 1 gram, the cartridge the hyperelliptical stylus. and B &K OR -2009 test records. In ad- force reduced to above 22 cm /s. The M95HE supplements, but does dition, we measured the separation at mistracked severely rate distortion with the not supplant, the M95ED in the Shure a number of spot frequencies with an The repetition low line. Anyone about to replace a worn Audio -Technica AT -6605 record. TTR103 record was extremely stylus on the M95ED would do well to Frequency response differences (Shure cartridges have consistently test), increas- choose an N95HE, but it would be between the records were relatively been outstanding in this the veloc- harder to justify replacing a good minor. With the STR100 record, re- ing from 0.63% to 0.84% as cm /s. N95ED stylus with the N95HE just to sponse was flat within ±1 dB from 40 ity increased from 15 to 30 M95HE modernize. While these two siblings to 16,000 Hz falling to about -6 dB at Subjective tracking of the Obsta- can be distinguished on the basis of 20,000 Hz. Channel separation read- was judged with Shure "Audio the audible and measured performance, it ings fell into two groups. The CBS and cle Course" records. As with found that Shure is the family resemblance that pre- B &K records revealed less separation TTR103, we have vails. It may be that reduced record than the JVC and Audio -Technica rec- cartridges tend to be among the best very-high- wear, a fairly intangible factor hard to ords, which were fairly similar. The mi- in their ability to track these confirm through measurement, will tip drange separation was 22 to 23 dB velocity musical selections without au- was no the balance in favor of the M95HE. with the first two discs and 30 to 35 dB dible distortion. The M95HE the CIRCLE NO 102 ON FREE INFORMATION CARD with the other two. At 10,000 Hz, the exception, handling everything on

THE Lectrotech Model PPI -400 Model PPI -400 Lectrotech dual -channel, LED Dual -channel peak -power in- Peak Power Indicator dicator is suitable 25 POPULAR ELECTRONICS www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 25 for monitoring the outputs of a stereo or two mono power amplifiers. It indicates power levels over a 30 -dB P.P.I range on two vertical columns of LEDs. A range switch provides 18 calibration points for the 0 -dB level (six power levels at impedances of 4, 8, and 16 ohms). The indicator can also be calibrated to any other power or impedance over a very wide range by connecting appropriate resistances across terminals on the rear apron. The 0 -dB power level can be set anywhere from 3 to 1250 watts at 8 ohms or over a different power range for er's manual, the 0 -dB sensitivity can device with 1000 -Hz tone -burst sig- impedances between 2 and 35 ohms. be set as desired. nals. As we changed the duty cycle The device can be connected Although the accuracy of the 0 -dB from continuous to 4 cycles on and across the speaker outputs of an am- calibration depends on the accuracy 128 cycles off, the error did not ex- plifier or across the input terminals of of the resistors, the relationship be- ceed 1 dB. the Sensitivity was up about speaker systems themselves. It tween it and other power -level LEDs 0.7 dB at 20 Hz and down 4.4 dB at measures 14 "W x 8 "D x 3 3/4 "H (35.6 is fixed by the internal design of the 20,000 Hz, relative x 20.3 x to 1000 Hz. 9.5 cm) and weighs 3.5 lb Model PP I-400. (Precision resistors (1.6 kg). Suggested retail price is are available from Lectrotech.) Since User Comment. In view of its in- $129.95 (plus $24.95 for optional No. the two channels are fully indepen- tended application LWC a§ a peak -power -1 walnut cabinet). dent of each other, it is possible to set indicator (not a meter), the errors we each for a different 0 -dB reference. observed in the Model PPI -400 are of General Description. Each col- no significant import. The device does umn of power indicators consists of Laboratory Measurements. We a fine job of displaying the actual op- eight calibrated LEDs. The bottom connected the Model PPI -400 across erating signal levels -both average, four are green LEDs and are labelled the output of an amplifier capable of shown by the number of LEDs lighted -30, -28, -24, and -12 dB. The developing the 60 volts or so required during any passage, and peak. (Even next two are yellow LEDs and are la- to activate its highest level LEDs. We the briefest peak registers visibly on belled -9 and dB. Finally, -6 the two then drove both channels in parallel to the display.) top LEDs are red and are labelled check the device's tracking. The PPI -400 is easy to connect into -3 and 0 dB. If the red LEDs flash The accuracy of the LED displays an audio system, and its LED displays during operation, it can be assumed was checked at 1000 Hz. At each set- are clearly visible and easy to inter- that the amplifier is being overdriven ting of the range switch, we increased pret even from a distance. or is being driven too close to its limits. the signal level until each of the LEDs The owner's manual refers to the This, of course, assurhes that 0 dB in turn began to glow at its maximum use of the Model PPI -400 as a speak- corresponds to the amplifier's rated brightness. The actual voltage applied er- system phasing checker. This is maximum output power. to the device was then measured with not entirely accurate, since all it can The seven -position range switch an accurate meter and converted to check is a polarity reversal of the two has six positions calibrated in watts an equivalent power level. Since the sets of signal leads coming from the full -scale from 25 to 800 at a 4 -ohm LEDs are not driven by a flip -flop or amplifier to the speaker systems and impedance. Separate inner scales are similar circuit, there was some am- to the device itself. Actual phasing of used for 8- and 16 -ohm loads, with biguity as to exactly when each LED the connections at the speaker sys- 0 -dB power levels corresponding to was just on. The LEDs began to glow tems can have no effect on the behav- 12.5 to 400 watts full -scale at 8 ohms well below the level that produced full ior of the Model PPI -400. and 6.25 to 200 watts full -scale at 16 brightness, which resulted in an un- A power -on indicator in the Model ohms. The seventh position, labelled certainty factor of a couple of decibels PPI -400 would have been a welcome Aux, can be used with the optional ca- when reading the display. In every addition. Its absence, for example, libration procedure to set the 0 -dB case, however, the two channels be- caused us to unwittingly leave the de- sensitivity for almost any power and haved in identical manner. vice powered for days on end. But impedance level orie wishes. The readings we obtained were even leaving it powered continuously, The Model PPI -400 is shipped from consistently low. (The indicated power the PPI -400 operated coolly, even un- the factory with its calibration termi- was less than the actual power.) If we der full -load conditions. nals connected together by jumper had elected to use the point at which a In sum, this was one of the most links and the Aux sensitivity set for LED first began to glow as our mea- versatile and inexpehsive peak -power 6.25 watts into 4 ohms for a 0 -dB level suring criterion, the error would have indicators we have used. It is attrac- indication. (This is 6 dB more sensi- been even greater. The error was not tive, flexible, and does exactly what it tive than the lowest standard range.) significant in Any case, measuring is supposed to do. Such a device By replacing can the links with suitable re- about 1 dB and a maximum of 2 or 3 be an educational addition to an audio sistances, their values determined ac- dB near the -24 -dB indicator. system. cording to a formula given in the own- We measured the response of the CIRCLE NO. 103 ON FREE INFORMATION CARD 26 AUGUST 1979

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 26 you can carryon a tradition...

Marine Corps tradition is one from those who know their trade. 'he tradition cf the Corps Find of strength and pride. And, as a You snarpen your confidence out more about us. Mail tie nerd Marine, you lean to carry it on. with tough physical training. or call 800 =423 -2%0. toL free. You learn an important job skill Anc., then, you walk with pride. :n California, 300 -252 -0241. Because you've earned a part in Maybeyoucanbebe i . I I 1-4 7''t The Few. arm of IAWu Pc ud The Marines

CIRCLE NO 51 ON FREE INFORMATION CARO

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 27 AC -DC Operation BNC Inputs 1 Meg Direct 50 Ohms Prescaled 8 Large .4" LED Readouts Auto Decimal Point & Zero Blanking

1 Year Limited Warranty Parts & Labor 100% Factory Assembled in U.S.A. $149x5 MODEL 500 HH MODEL 100 HH 50 Hz - 500 MHz 50 Hz 100 MHz Without Battery Capability - $9995 SAVE $ 500 Without Battery Capability With Battery Capability MODEL 500 HH .. $169.95 MODEL 100 HH .. $119.95

The 100 HH and 500 HH hand held frequency counters represent a significant new advancement, utilizing the latest LSI design ... and because it's a DSI inno- vation, you know it obsoletes any competitive makes, both in price and performance. No longer do you have to sacrifice accuracy, ultra small readouts and poor resolution to get a calculator size instrument. Both the 100 HH and 500 HH have eight .4 inch LED digits 1 Hz resolution - - direct in only 1 sec. or 10 Hz in .1 sec. - 1 PPM TCXO time base. These counters are perfect for all applications be it mobile, hilltop, marine or bench work. (800- 854 -2049) (800- 542 -6253)

FREQUENCY COUNTER CONSUMER DATA COMPARISON CHART SUG'STD. FREQUENCY TYPE OF ACCURACY OVER SENSITIVITY DIGITS PRE -SCALE INPUT MANUFACTURER MODEL LIST RANGE TIME BASE TEMPERATURE RESOLUTION 100 Hz - 50 MHz - 250 MHz - No. PRICE 17° - 40 °C 0° - 40 °C SIZE IN 25 MHz 250 MHz 450 MHz INCHES 1 SEC 1 SEC DSI INSTRUMENTS 100 HH $ 99.95 50Hz- 100MHz TCXO 1 PPM 2 PPM 25 MV NA NA 8 .4 100 Hz 10 Hz DSI INSTRUMENTS 500 HH $149.95 50Hz- 550MHz TCXO 1 PPM 2 PPM 25 MV 20 MV 30 MV 8 .4 100 Hz 10 Hz CSC# MAX -550 $149.95 1kHz- 550MHz Non- Compensated 3 PPM @ 25 °C 8 PPM 500 MV' 250 MV 250 MV 6 .1 NA 1 kHz OPTOELECTRONICS OPT -7000 $139.95 10Hz- 600MHz TCXO 1.8 PPM 3.2 PPM NS NS NS 7 .4 1 kHz 100 Hz

" 1 KHz - 50 MHz # Continental Specialties Corp. The specifications and prices included in the above chart are as published in manufacturers literature and advertisements appearing in early 1979. DSI INSTRUMENTS only assumes responsibility for their own specifications

VISA T -500 Ant. $ 7.95 100 HH ... S 99.95 W /Battery Pack ... $119.95 SS 500 HH ...$149.95 W /Battery Pack ...$169.95 AC -9 Battery Eliminator $ 7.95 Prices and .'or These DSI INSTRUMENTS, INC. TERMS: specifications prices include factory MC - VISA - AE - Check - M O. - COD in U.S Funds subject to change without installed rechargeable NiCad 7924 Ronson Road, Dept G Please add 10% to a maximum of $10.00 for shìppmg. handling notice or obligation. battery packs. San Diego, California 92111 and insurance. Orders outside of USA & Canada, please add $20.00 addition to cover air shipment. CIRCLE NO. 15 ON FREE INFORMATION California residents add CARD 6% Sales Tax www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 28 Popular Electronics' AUGUST 1979

Solid -state level-sensing o switch for sump pumps AFLOODED basement is a minor main energized until the water level falls household disaster. That's why below a keep -alive probe. If the pump most homeowners whose basements fails or cannot keep the water in check, are prone to flooding install sump an optional alarm will sound as the water pumps. Some, however, have discov- level reaches a trigger probe specifically can be ered to their chagrin that the pump for that purpose. The project ac somehow fails to operate when it is most powered either by batteries or the are em- needed. In many instances of failure, the line. Inexpensive components found in pump itself is actually in perfect working ployed, most of which will be any well -stocked junk box. By Phillip Windolph order. Rather, it is the water- detecting actuator switch that's the culprit, never The Electronic sending a turn -on command to the pump. About the Circuit. is schemati- Here's a simple, dependable circuit to Sump Pump Switch shown from replace the often -unreliable (usually me- cally in the figure. Positive voltage to the COM- chanical) switch supplied as part of the the power supply is applied R1 and R2. pump assembly. It will automatically ac- MON probe via resistors stiff wires tivate the pump when the water level (This and all other probes are and ex- reaches the level of a pump trigger or metal rods suspended above probe. Once activated, the pump will re- tending to different levels in the sump.)

MGZGCZCB.1 G72 -GG/2paCLG ?GG/Z?- dGlil4 ll'`/ K/1 C'///af Cl Gc7 -1 /oar ocicofziùze.eei Pc oPfiu,rr// 41// //If'/k»9' 31 AUGUST 1979

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 29 Ycytf-cc.il-vccL cc/ifi»4/cd...

As can be seen in the figure, the COM- voltage across SO/ for the pump. If the PUMP TRIGGER and KEEP ALIVE probes MON probe extends almost to the bottom sump pump is connected to the socket, and eventually reach the ALARM TRIG- of the sump. Any water entering the it will be activated and will start to pump GER probe. This probe is part of the op- sump comes into contact with this the water out of the sump. tional alarm circuit and should be mount- probe, but as yet nothing which would As the water level drops, the conduc- ed near the top of the sump. Although cause activation of the pump happens. tive path provided by the water in the the alarm circuit is independent of the As the water level in the sump rises, sump between the COMMON and PUMP pump controller, it is a valuable addition the KEEP -ALIVE probe touches the water, TRIGGER probes will be interrupted. to the project. but this still does not activate the pump. However, current will continue to reach The alarm circuit closely resembles If the water reaches the level of the the base of 03 via the KEEP -ALIVE that of the pump controller and operates PUMP TRIGGER probe, current can flow probe, R7, and one set of contacts of re- in a similar manner. Water reaching the from the positive supply voltage terminal lay K1. Because this probe extends al- ALARM TRIGGER probe provides a path through 131, R2, the water in the sump, most to the bottom of the sump, relays for current to reach the base of Q1. This R5 and finally into the base of 03. This K1 and K2 remain energized (as does transistor begins to conduct and pro- transistor then turns on and provides the pump motor) until practically all of vides base drive for 02. Transistor 02 base current for 04. When 04 conducts, the water has been evacuated. When then conducts and completes the circuit it energizes the coil of relay K1. the water level drops below the free end for audible alarm Al, which alerts the Once this relay is energized, the nor- of the KEEP -ALIVE probe, Q3 is deprived homeowner to the fact that water in the mally open contacts are closed and two of base current and is cut off. This sump has risen to a critically high level. things happen. Line current is able to causes Q4 to stop conducting, deener- He can then try to get the pump working flow through the coil of K2, a heavy -duty gizing K1, K2 and the pump motor. ac relay. Also, the path between the If the pump motor fails or cannot cope KEEP -ALIVE NC probe and the base of 03 is with the amount of water entering the completed. Energizing K2 provides line sump, the water level will rise above the NC

CI +VCC .IyF

K2 RI 39K IN4001

01 S3 PUMP TEST SI ALARM TEST SOI PUMP MOTOR 02 2N2222 116 Al,P

S2 ALARM DEFEAT

R2 R3 117 R5 RT VAC IK I IK IK

COMMON ALARM PUMP KEEP - PROBE TRIGGER TRIGGER ALIVE PROBE PROBE PROBE

ó 7á. 0 Schematic diagram of the sump SUMP pump switch. Water in the sump 0ó° provides a path for base current. oa

ÓáóoQ$°°oQó,aoó:óáD°. o CödoFO !'`t Pé. .(._. ó0 n000 .O á0v:oe ae^° PARTS LIST AI -Dc- energized buzzer, bell, SonalertTM or SOI -Ac power socket similar audible alarm* Misc- Line -powered, regulated or battery dc CI-1). I -µF, 1000 -volt disc ceramic The following are Vs -watt, 10% tolerance car- supply *; suitable enclosure; harrier terminal DI,D2- IN4001 rectifier bon- composition resistors: strip; perforated board; fuseholder; line F I -Fast -blow fuse * R 1- 39,000 ohms* cord; metal rods or stiff, solid- conductor K I -Dc- energized relay* R2 through R7-1000 ohms* wire; hookup wire; solder; self- tapping and K2-117-volt relay* S I- Normally open pushbutton switch machine hardware, etc. QI through Q4- 2N2222 or similar npn S2- Miniature spst toggle switch switching transistor* S3 -Spst toggle switch* *See text. 32 POPULAR ELECTRONICS

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 30 a 117-volt ac portions of the project so that or, if necessary, bail the water out of the and can be chosen to accommodate no shock hazard is present. sump manually. particular dc relay (K1). Practical supply Two switches are associated with the voltages range from 6 to 15 volts. Al- and Installation. After alarm circuit and one switch is included though it is not necessary, voltage regu- Checkout the control box has been wired, connect in the pump controller. These switches lation is desirable in a line- powered sup- lengths of hookup wire to the barri- provide test facilities for the alarm and ply. The widespread availability of volt- short er terminal strip. Remove a portion of pump (S1 and S3, respectively) and the age regulator ICs makes the inclusion of insulation from the free end of each ability to silence the alarm (S2). The cur- regulation simple and inexpensive. the Next, fill a drinking glass or mea- rents handled by S1 and S2 are relative- If the alarm circuit is included in the wire. suring cup with water and place the wire ly small, so miniature components can project, battery power enjoys a signifi- to the COMMON probe termi- be used in these locations. Switch S3, cant advantage over a line- powered connected nal into the water. Place the wire con- however, as well as the contacts of K2 supply -it will still provide power to the nected to the KEEP -ALIVE probe terminal must be capable of handling the current project if the commercial power line is into the water. (Keep these and all demanded by the pump motor, so use blacked out. Of course, if line power is probes from touching each other to real- heavy -duty components. not available, the pump motor will not be istically simulate actual operation. No The author employed a solenoid/ activated, even though K1 will be ener- will be damage will occur, however, if the spring -type buzzer as his prototype's gized. The alarm circuit, however, to probes accidentally come into contact.) audible alarm. Diode Dl is connected activated if the water in the sump rises Activation of the pump controller, in- across the buzzer to protect 02 from in- the level of the ALARM TRIGGER probe. dicated by a click as the relays are ener- ductive spikes generated by the buzzer. This will alert the homeowner that water bailed gized, should not yet happen. Other types of alarms can be used, is accumulating and had best be Also, Now insert the wire connected to the some of which will not require the inclu- out before any damage occurs. con- PUMP TRIGGER probe terminal into the sion of Dl. A SonalertTM or similar audio when neither the alarm nor pump no water. You should hear a click as the re- oscillator will not necessitate diode pro- troller circuit is triggered, practically lays are energized. If desired, a lamp tection for 02, but an alarm bell will. current is drawn from the battery supply. can be connected to power socket SO1 Which type of audible alarm you If nonrechargeable batteries are used to life and the line cord connected to the power choose is largely a matter of personal power the project, long operational line (assuming this has not yet been preference and parts availability. Simi- can be expected. done). The lamp will then indicate that larly, there is a great deal of leeway in the relays are energized and that line the choice of components Q1 through Construction. The circuit is relatively per- power is reaching socket S01. 04 and R1 through R7. General -pur- simple, which suggests the use of Remove the PUMP TRIGGER wire from pose 2N2222 transistors are suggested forated board and point -to -point wiring of the the water. The relays should remain en- in the parts list. Just about any low -pow- techniques. Remote mounting will ergized and no click should be heard. er npn transistor is suitable for use as alarm and pump controller circuits If this is Then remove the KEEP ALIVE wire from Q1 and 03. Exactly which transistor simplify any future servicing. the water. At this time, the relays should types are acceptable for use as Q2 and done, the circuit board, relays, switches drop out and a click heard. Finally, insert 04 depends on the audible alarm and and power supply can be housed in a can be in- the ALARM TRIGGER wire into the water. relay (KI) used. If the current demand of suitable enclosure which The alarm should sound and remain on either load is fairly low, say, 300 mA or stalled at some convenient location. can be until the wire is removed from the water. less, a general -purpose component A four -terminal barrier strip for the leads Press the ALARM TEST pushbutton such as type 2N2222 can be used as a mounted on the control box These and keep it depressed. The alarm relay or alarm driver. running to the sump probes. from either should sound and remain activated until However, if a load draws more than probes can be fashioned No. 12 or the ALARM DEFEAT Switch is opened. 300 mA, a higher -power driver will have metal rods or lengths of solid should be The operation of the PUMP TEST switch to be used. A good rule of thumb is to No. 14 copper wire and the sump. The can be checked by closing it and observ- use a transistor with a collector current mounted rigidly above with the ing whether the load connected to sock- rating that is double the current required probes are of varying length, receives line power. coil. The author COMMON probe extending almost to the et SO1 by the alarm or relay the the KEEP -ALIVE Once it has been determined that employed a sensitive 6 -volt relay for K1 bottom of the sump, the control box is functioning properly, a (Sigma No. 70R4T -6DC), which permit- probe extending almost as deeply, about permanent installation can be made. ted the use of a low -power npn driver. PUMP TRIGGER probe reaching Mount the control box at some conven- Diode D2 was included to protect the re- halfway down, and the ALARM TRIGGER ient point and interconnect it with the lay driver from inductive spikes. probe extending only a short distance probes and pump motor. Be sure The values specified for the fixed re- into the sump. Suitable lengths of hook- sump to bypass the stock pump -activating sistors (R1 through R7) are nominal up wire should be soldered to the probes switch as it is no longer needed. As a fi- ones. Substitutions can be made freely if and routed to the barrier terminal strip nal check, you can quickly fill the sump you want to use components you have on the control box. box, be with water. The alarm should sound until on hand. However, do not make the When constructing the control semi- the pump has lowered the water level fixed resistances so low that they tax the sure to observe the polarities of all supply beyond the reach of the ALARM TRIGGER base current ratings of the transistors conductors and, if a line- powered Use probe. The pump should remain on until employed in the project. is built in, of electrolytic capacitors. and heat the KEEP ALIVE probe is no longer im- Either a line- powered or battery sup- the minimum amount of solder connec- mersed, at which point nearly all of the ply can be used for the project. The ex- consistent with making good will have been taken out. is not critical tions. Take special care in wiring the water act value of supply voltage overleaf) (Projects continued 33 AUGUST 1979

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 31 co////. . Vehicle low-fuel indicator S1/4v,in./ou/,di 4(i/(iCíp,//LiC-iC//, ,rC.//(!f'//f(/J O 4IiC6'ofll lo af/'F'(lIewm`lF-'dlF%(iF'/)

RUNNING out of gas can be an exas- By Bradley Albing preset voltage on the inverting ( -) input, perating experience. The low -fuel the output of ICI (pin 6) goes high. indicator described here can help you This voltage (approximately 9 volts) is avoid this situation. It will -I-12V sound an high enough to cause zener diode D6 to alarm when the fuel level in your gas FUEL conduct and turn on transistor Q1. When tank reaches GAUGE a predetermined mini- turned on, this transistor draws current mum. This level can TO ALARM be preset by a sim- through audible alarm Al, and turns on ple potentiometer adjustment. optional indicator LED 1. SENDER As long as the fuel Circuit level is low, the Operation. In most vehicles, output of IC/ remains high. To silence the fuel -level sensor is a float -controlled the alarm until the tank is filled, CANCEL potentiometer (sender) wired in series switch S1 is depressed to trigger SCR1. with the dashboard- FLOAT mounted fuel gauge When triggered, the SCR brings the (meter) and connected between the junction of R5 -D6 (the input to Q1) down chassis and + 12 -volt line as shown in to approximately 2.2 volts, which is not Fig. 1. As the fuel level changes, the re- high enough to cause D6 to conduct and sistance changes, making the meter in- FUEL TANK activate the alarm circuit. Since the SCR dication change. Fig. 1. Typical fuel -gauge is powered by dc, it will remain turned on The voltage level circuit. thus generated as long as the IC1 output is high (the fuel across the fuel -level sensor can be level is low). tapped off (at the meter) and, as shown voltage transients generated by the As long as SCR1 is conducting, there in Fig. 2, applied through a low -pass fil- switching voltage regulator as used in will be about 1.2 volts (two diode drops) ter R8 -C4 so that the voltage across C4 some vehicles. across D7 and D8, enough to turn on Q2 is the average across the sender. This The C4 voltage is applied to the non - and cause LED2 to operate. This LED low is -pass filter also eliminates any rapid inverting ( +) input of comparator ICI, a special type that incorporates a built -in voltage fluctuations due to gasoline and rises with decreasing fuel in the flasher circuit that makes the LED flash sloshing and a bouncing sensor float, or tank. When this voltage exceeds the R4 at a 2.5 -Hz rate as long as the LED is (Continued on page 40) Cable on author's prototype has connector for +12 volts, ground and tank sender unit.

34 POPULAR ELECTRONICS

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 32 PARTS LIST 4-12V KAvV+nn-411 R2 DI 3311 AI -Sonalert, buzzer or other 12 -volt alarm 1N914 or similar) (Radio Shack 273 -060 C2 CI ,C2- 100 -pF, 25 -V aluminum electrolytic - IOOyF RI D5 C3.C5- O. 1 -p.F, 25 -V disc or Mylar 10011 IN4001 C4- 300 -p.F, 15 -V tantalum electrolytic Dl ,D7,D8 N914 -1 01 1N5742, I8 -V, 400 -mW zener D2- D6 D3,D4,D9 -I N751 A. 5.I-V, 400 -mW zener 83 D5-1N4001 Cl.-.. 470.2 100 D2 C R14 zener D6- IN5732. 6.8 -V, 400 -mW Y F BV PF Zoon ICI -3140E op amp LED D3 LEDI -red 51V LED2- Litronix FRL -44t)3 flashing LED (Ra- -036) R4 dio Shack 276 D4 25K QI- 2N3053 or similar 5.I V 470K 10K Q2- 2N3904 or similar !RIO The following are 1/4-watt, 10% tol. resistors. RI,RII -1000 ohms R2 -33 ohms RII LED 2 R3,R5,R 12-470 ohms 10011 R6-I0 megohms SI 02 CANCEL 2N3904 R7-470.000 ohms SCR! RS- 33,000 ohms R8 2N5062 R13 820(1 R9 -330 ohms FROM 33K 5.I V FUEL -LEVEL R 10- 10.000 ohms SENSOR D7 R 13-820 ohms R!2 47011 IN914 R 14-200 ohms R4- 25,000 ohm potentiometer C4 C5 D8 300)JF .IyF IN 914 SCR 1- 2N5062 switch S I- normally open pushbutton Misc. -Suitable enclosure (Radio Shack 270 -285 or similar), interconnecting leads, mounting hardware Fig. 2. Comparator IC1 turns on when fuel drops below Note: The pc hoard (LF -2) is available for i Sled level, and sou nds the alarm. The SCR from BFA some predeternr $4.50 plus $1 postage /handling circuit energizes a flashing LED during the Cancel mode. Electronics, P.O.Box 212, Northfield, OH 44067. Ohio residents please add sales tax.

Printed circuit board mounted in prototype with alarm and CANCEL switch on top.

35 AUGUST 1979

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 33 At CIE, you get electronics career training from specialists. 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.

Special Projects Director Cleveland Institute of Electronics

36 POPULAR ELECTRONICS

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 34 a professional quality the exams get their Licenses. You Plus there's an FCC My father always told me that oscilloscope you build and use to may already know that 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 You work with experi- Find out more: Mail this anyone else, and you'll always be FREE in demand." enced specialists. card for your 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 who have known contact you to answer any questions good, he'd be out of business. People you may have. us a long time, think of us Remember, if you are serious Why trust your education as the "FCC License about learning electronics ... or and career future to School." building upon your present skills, bet is to go with the elec- anything less than a We don't mind. We have a fine your best people to take.. tronics specialists -CIE. Mail the specialist? record of preparing card or coupon today or write CIE You shouldn't. And you certainly and pass... the government- mention the name and date of don't have to. administered FCC License exams. (and inde- surveys nearly this magazine ), 1776 East 17th FACT: CIE is the largest In fact, in continuing Cleveland, Ohio 44114. pendent home study school in the 4 out of 5 of our graduates who take Street, 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 cool - and want the training it takes - to make sure that a sound blackout during a prime time TV show will be corrected in seconds -then answer this ad. You'll probably find CIE has a course that's just right for you! At CIE, we combine theory and practice. You learn the best of both. Learning electronics is a lot more than memorizing a laundry list of facts about circuits and transistors. Electronics is interesting because it's based on some fairly recent Iatterns shown on and oscilloscope screens are simulated. scientific discoveries. It's built on ideas. So, look for a program that starts with ideas -and builds on them. That's what happens with CIE's Cleveland Institute of Electronics, Inc. Auto -Programmed® Lessons. Each 1776 East 17th Street, Cleveland, Ohio 44114 lesson uses world- famous CIE Accredited Member National Home Study Council "programmed learning" methods to -CIE. you important principles. You . John, I want to learn from the specialists in electronics teach YES about troubleshooting explore them, master them com- MI Send me my FREE CIE school catalog - including details pletely ... before you start to courses -plus my FREE package of home study information. PE -95 apply them! Name -- But beyond theory, some of our I. Print - fully equipped with Apt courses come IAddress - the electronics gear to actually let you perform hundreds of checking, IICity testing and analyzing projects. State In fact, depending on the course - Zip _ Phone (area code) you take, you'll do most of the basic Age things professionals do every day - Veteran Active Duty things like servicing a beauty of a Check box for G.1. Bill information: Zenith color TV set ... or studying a Mail today: variety of screen display patterns with the help of a color bar generator. 39 AUGUST 1979

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 35 cßiaiùzacal..

LED 2

K 0--D9-y 03 K De 613 TO LCS-- SI K111 02 -RI2-- 6-R8 -- +) 10-R7- - RII - TO FUEL C4 -R6-y 1K TANK D6 SENDER --C3---- R 5 - UNIT

1 14 1K KI RIO RI RI -D3-1 K / f AI D4 GND J K DS-o.-- 0---R 9 +121 DI --

+ R4 K TO 1 LEDI --R2-- C2 low

Fig. 3. Actual -size etching and drilling guide is shown at left. Component placement guide is above.

powered. The maximum voltage permit- shown in Fig. 3 along with the compo- and wiring of the fuel -level sensor in ted across this special LED is 6 volts, nent installation. your vehicle, consult the vehicle hence the presence repair of 5.1 -volt zener di- The two LED indicators, CANCEL manual. ode D9. switch Si, level- select potentiometer The incoming dc power line is noise R4, and the selected audible alarm are Calibration. There are two ways to decoupled by Rl, Cl and C3. Zener di- not mounted on the pc board. calibrate the system. The first is to wait ode D2 clamps any transients to a max- The finished pc board can be mount- until the fuel imum level is down to the select- of 18 volts while diode D1 makes ed within a selected enclosure that will ed low level, then adjust R4 until the sure that the correct polarity is supplied also mount the off -board components. alarm sounds off. to ICI. Filter R2 -C2 decouples the pow- Power can be derived from any +12 -volt The second approach is to disconnect er line to the alarm and indicator circuit. source that becomes active when the the fuel gauge from its feed line to the Diode D5 clamps any voltage spikes vehicle ignition key is operated. The fuel sender but leave that may the lead connected occur if an inductive load, such ground can be any convenient metal to the low -fuel alarm, then connect a re- as a buzzer, is used as the alarm. Resis- element that is solidly connected to the sistor- substitution box between the fuel tor R6, connected between the output of vehicle chassis. gauge and ground ICI (pin (as a substitute for 6) and the noninverting ( +) in- You will have to locate the dashboard the fuel sender). Adjust the value of the put, adds a small amount of positive end of the fuel sensor lead. Test this resistor feedback until the fuel gauge indicates the to give the comparator a little lead by measuring the voltage across it desired level. Adjust R4 to sound the hysteresis and speed up the transition with various levels of fuel. Usually, the alarm at that point. Disconnect from low to high. This the resis- also reduces the lower the fuel level, the higher the volt- tor likelihood box and replace the fuel sender line. of comparator oscillation. age. It is possible for this voltage to vary Once the fuel -level turn -on point has due to the action of the vehicle switching been determined, depress Si to silence Construction. The circuit may be voltage regulator (if your vehicle uses the alarm. After the tank is filled, the constructed on perf board, Wire - one) so this must be considered. alarm will be reset until the fuel level Wrapped, or on a pc board such as that If you have any doubt as to the type drops below the predetermined point. O 40 POPULAR ELECTRONICS

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 36 By Cass Lewart gas leak meter 0 Portable %//`PFI-.1Fri.1/1i2ir ii/,)i7///iFr//7/irFa ///F//ii/(/t/2rF' F', F%fiir7.J, Ff('. /2///%»Frf/»r/ 0 I/oh/irr`Fr,l,, ///7/

serve as protection for Ml. Overall cir- TOXIC and explosive gases are an Circuit Operation. The gas sensor, cuit sensitivity is determined by the val- ever -present danger in our mod- GS1 in Fig. 1, consists of an electrically re- ue of resistor R5, while S2 provides a ern society. They include natural gas, heated tin -oxide pellet that changes TEST function. propane, fuel vapors, and invisible and sistance when exposed to carbon mo- BATT. Once the bridge is balanced, by NULL odorless carbon monoxide. noxide, hydrogen, propane, alcohol, potentiometer R8, any change in the re- The ultra- sensitive gas -leak detector gasoline vapor, and other oxygen - sistance of GS1 will create an unbal- presented here indicates the quantita- reducing gases. Power for the circuit anced condition. When this occurs, the tive presence of these gases and en- can be obtained from either six D cells, meter's pointer swings upscale, by an ables one to track down and pinpoint the preferably rechargeable, connected in amount proportional to the change in re- source of a gas leak by observing the series or from an optional 9 -volt battery sistance of GS1. unit's meter indication. Moreover, it is a eliminator. Regulator IC1 reduces the portable, battery- powered model for use available 9 -volt level to the 5 volts re- With the exception of in boats, automobiles, at campsites, or quired by the circuit. Optional LED1 is a Construction. RS1, J1, M1, 81, R8, Si, and S2, the in any other location where ac power is 9 -volt power -on indicator. can be assembled on a piece of not available. (An ac- operated noxious Current from the regulator heats gas circuit board. Select an enclosure gas detector with an audible alarm for sensor GS1's semiconductor pellet. The perforated to accommodate the preset gas levels was described in a sensor, R4, R7, and R8 are arranged in large enough and off-board components, in- project that appeared in POPULAR ELEC- a bridge configuration. The null indicator board and cluding 81 and its holder. TRONICS, August 1976.) consists of M1 and R6. while D1 and D2

time "m TIMEGLOWT.9Iow Company Ltd. -A compare' every devoted to electronic yuarantead. Our prigs are t.ONHST because we specialise In tits. systems.$ystetwe. All lwattdeandlse 100% guaranteed. NEW Digital Electronic Alarm Clock Systems and Clock/radio Modules In RED, C.' a or provided for systems. Only soldering iron and solder needed for easy assembly. Now you can make a digital clod¡ anywhere and In any color you want. Step by step Instructions Clock System Clock /radio) Module only Functional Features TG toot and TG 1002 Digital Electronic Alarm s saes. TG 1001, 6" 115mm1 and TG 1002..9' (23mm1 ICOrrple[e kn eec 11' case) raaowwa Available m two display LED DESCAIPTNIN 'PAiCEI .lr High elhoency "RED ". "GREEN" and -YELLOW" display roil , QT1 ITEM NUMAEN HF. or 101191 indio[a TG 1801$112 LED Rae 12 M User programmable 12/24 hr , 50/60 fiat flashrg 1001 052 -5 LED Rol 12 't ' r ` i15met module $ 695 On board alarm oscillator sysystem REO Felt 24 M., PM.. Colon. Alarm ON LED rdicators .TG 1001 p21 r $206. 24 ft 7 75 Multiple 9 -route snooze counter ilttJkW'C7t0Ya 17.50 TG 1002 R12 LEO Red. 12 hr , r Direct dose LED display - no RN 1062 ' 1 Qaiicimi 1150 115mm1 rotule B 50 hr ON -OFF control 24 alarm oath `TG 1002 P24 LED Reel 24 M 1002 .t4- L , 4 n, 4 r Display flashes after power has been interrupted for more than 2 seconds - 115mm) 925 ®s stem 110 module iGnei loss of poser 12 Sec l Insenuthe to temporary TG 1007 012 LED 6em 12M. r w r rouse lbw, fast and seconds time set controls #áD ISewl o 12h, AM Orr finger 5modes ¡t sleep counter At t sslre ME. SECONDS. ALARM and SLEEP) CÄoLMe Co ÑVe, Leading zero blanking °' WLK 5mm) module 9.50 External brightness contra opab,llry Klt Aker Yellow, 21 hr re 1002 R72 -S Compka kk eroept ose On board rado swab for clock radio applcatens Tra Spe Wtre. TG 1001 924 LED w' 6" 115001 module 10. 25 Pulsating 2 kHz alarm tone output ónnecttn0 r 115m m1 sys lem 1100 - 1003 VF, 12 or 21 hr. from winding Iranstorn err Snotan .. Operates single . module. ' 3 smystem TG 1003 0 included241s, Functional Features Case speaker 12 or 24 to and fixed or flastu g colon rdcators no - User programmable 10,500016 5958 e Imo Switches, t 1195 4 fluorescent indicator pawl case) 1 D,go sae 3' 17 5 nonl. digit Io. 1995 12 hr, C -_ Hours. minutes, seconds set controls Lat. 12 hr. C rG 10M- 110. 1 module 7795 t reset control wits of the tour signal output 11024 G. sec) m t Hours. monotes. seconds 110mm1 sysle 2064 LGO 00 Speaker included m sw Imes 7G 24 l' 1895 IlOmml module 7795: Operates horn 12 VGC supply 99411 or ^TG 1003 &S I2 /N TG 1005 VF, 12 hr, r Lockout of Ome setting when dopy h "000 wit, display mode select. Ri,. r.. ¡fOmml system lSmm1 module 950 Automotive dnplay brightness control logic includes ewncbee : TG 505 VP 21 hr 6" 194304 MHz). If.. Crystal controlled oscillator 14 Speaker 1995 (15mm) module 1025 1-sf Bright 0.3' vacuum fluorescent display flderable to Blue. Green and Yellow çQ j7 and om reserSal. r TG 1001 and TG 1002 modules syslrms l is Protected against automotive wltge transents and battery 1250 n Ind 24 ra modules have optional Ca15e'ruent no roll over time setting controls at 1 Hz rate 1005 a 79.for period pri.00prices moll ocrera TG 1002 AI2 11.00 /2 ^- Leading Fero blanking. 'lotting Dect. 1, 1979 for systems with 52.00 tad loi nodules with $1.50 per tern Accessories prices Wi LCD 4" (lOmm) 4 digit display. Accessories emain Ume same. TM mdkators. PM indicator 12 It ony1. Wk /wake trnel and 'sleep Mel PRICE AM. Iles QTY. ITEM EDEMA DESCRIPTION Shipping and Handling Charges 12 or 24 kir evadable 100 Fas1 and sef. For 0100. systems add 52 50 per System. foxed or flashing colon seconds and alarm User programmable lransfmmer5) on -011 swath SI 00 For modulo and accessories (except On board alarm 0001Ntor. add 51.00 per order To 101 Snooze and alarm 7 snooze taunter. Multiple minute sel Sw,tth 1.00 =or transformers add 51 00 per Iranslprrner. control 24 it alarm wtm on-off TG 120 LE/ VF Transformer 120V 200 =or orders over S100.00 . no charge. 59 minute sleep counter scrag. TG 220 LE /VF Transformer 220V 300 We ship worldwide - Add 202 for overseas orders.

1 hours and inmutes. COnseae0t no roll Oser Orne setting controls at Hz rate on TG 300 5 eke, for alarm 100 Prices salted to change without notice output. 1G e 120V 1 OD Hours montes reset contra wnm on the Prod SIgrlal cord Io order, Call or send CIIecklmoney order wen order Crystal controlled oscillator of 32.768 kHz. TG 0401 ine cord 220V !ohm Io Mlceearsn. leo 4320 Saratoga- Sunnroale Road (Europe 200 A. leading Fero blanking. Saratoga, CA 95070 U.S TG 503 Case Ior G 1003 fluorescent Tel 1401) 8675659 TG 1005 -A 12 or 24 hr cock module featuring4 dgn. 6' ItSmm1.41coun (33k' 5 25' a 2'I 595 TWXITELEX 91059090004,1,00oon display filterable to 81ue, Green or Yellow. Other features simian to TG 1001 Deal Once of Items Necked above Phone Name Calif. residents add 6% sales tas State Zi Address City Shipping a handling charges Lop Date VISA/MC Charge card number Total dick or money order Signature TG 1004 22/24 For MC Include 4-dolt Mterbank number OEM customers: Large discounts available. Dealer Inquiries solicited - Ask for c...VWI sal price list on your letterhead. CIRCLENO. 36ONFREE INFORMATION CARO 41 AUGUST 1979

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 37 Sávo-co.il,%rcyc6 co/44imicd..

Mount the meter movement on one er, set S1 to ON and S2 to BATT. TEST, S2 to RUN and, in a neutral atmosphere, side of the enclosure's front panel, the and make a note of the point on the me- adjust NULL control R8 until the meter in- remaining off-board components (exter's scale at which the pointer comes to dicates zero. Now, place a drop of al- cept 81 and J1) on the other side of the rest. Turn off the power and carefully re- cohol or gasoline on a finger and ap- panel. The battery holder and optional move the cover from the meter's face. proach the sensor. The meter pointer battery- eliminator /charger jack J1 are Use a felt marker to identify the battery - should swing upscale. Move the finger best mounted on the rear wall of the en- test point on the meter's scale. away from the sensor; it will take a min- PARTS LIST

B I -Six D cells in series

DI,D2 --Germanium diode ( I N34A or similar) CS 1-Model 812 gas sensor ICI -5 -vole regulator (Radio Shack No. 276 -1770 or similar) -. J I Normally closed miniature phone jack (Radio Shack No. 274 -281 or similar) 1,EDI --Red light emitting diode M1.-50-RA meter (Radio Shack No. 22-051. No substitute)

R I - I000-ohm, t / -W, 10 %r resistor

R2--- 22,000 -ohm, /zI -W, 10% resistor

47(X) t R3,R7- -ohm, / -W, 10%n resistor R4-- 15,0(0-ohm, 1/2-W, 10% resistor R5- -2700 -ohm, I /-W, 10% resistor R6 -2200- ohm, 1/2-W, 10% resistor R8-- 1O.000 -ohm linear potentiometer

S I -Spst switch 6 S2- -Dpdt switch GSI O O BOTTOM 5 O 0 2 Misc. 7 -pin miniature tube socket; battery VIEW O O 4 holder; enclosure: 9 -\ull dc calculator -type i ac adapter (optional): machine hardware; hookup wire; solder, etc. Fig. 1. The gas sensor forms one arm. of a Wheatstone bridge. *Available for 57.5)) postpaid from Southwest Pins 1, 2 and 3 can be interchanged with pins 45 and 6. Technical Products Dept., PE -2, 219 W. Once bridge is balanced by R8, a change in resistance Rhapsody. San Antonio, TX 78216. of GS1 will canuse meter pointer to swing upscale. closure. If desired, GS1 can be mounted Operation. Set S1 to ON and allow the ute or so for the sensor to settle back for either directly on the front panel or in a sensor to heat up for about two minutes. the next measurement. Readjustment of separate housing, the latter fitted with a Set S2 to BATT. TEST and check that suf- R8 may be necessary occasionally. If cable to connect it to the main enclo- ficient voltage is available from the bat- setting time is too long, change R7 to sure. The sensor itself takes a miniature tery. (A set of fresh D cells will last about 1000 ohms. 7 -pin tube socket. 20 hours. An external 9 -volt battery- When looking for a gas leak, note lo- After the project is assembled, install eliminator /charger can be used.) cations where the meter swings up- a fresh set of D cells in the battery hold- After the sensor has warmed up, set scale to narrow down the location. O Electronic pedometer

o for joggers By Andrew A. Mod la

fi cJ/il/FW: cY7/irf/i/f /-2/ÌO 01/ F. 0(0`ji< / íKfe/0/(k&W-cr cciWrK/ (//oA`l ap,»9-.-i.

AN INEXPENSIVE pocket calculator simple conversion, you can use the calculator, you sacrifice none of the cal- can be converted to operate as an culator to determine the number of culator's basic built electronic pedometer -in capability. to keep an on- yards, meters, miles, or kilometers trav- going tally of the number of steps taken elled. Although the conversion de- Calculator Conversion. The first while walking and jogging. Then, with a scribed here is "hard wired" into the cal- thing you must do is determine whether 42 POPULAR ELECTRONICS

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 38 As shown culator and care`ully check oui the or not your calculator has a built -in con- Footswitch Fabrication. footswitch is fabricat- switch arrangement. stant function. To do this, press CLEAR, in the drawing, the a available "air - 1, +, 1, =, =. If your calculator has the ed from commercially cutting a Determining Distance. Every time necessary constant function, the display pillow" foam insole. Begin by away from the cen- you use the pedometer, you must first should read 3 and should increment by 1 1" (25.4 -cm) square the insole. Cement key in 1, +, 1. Thereafter, the calculator for each additional operation of the = ter of the heel area of coated Mylar or increments the display by 1 for each key. Having established the fact that a square of copper- conductive material step taken by the shoe in which the your calculator does indeed have the any other flexible sides of the in- switch is installed. To determine how far constant function, you can proceed with over the cutout on both face -to -face. you have run or walked, you must find the conversion. sole, conductive surfaces free ends of the flexible out how many steps you take in a given Conversion of the calculator consists Solder the from the calculator to the conduc- measured distance (mile, kilometer, in simply wiring a foot -operated switch wires material. Then cover the "switch" etc.). You must, therefore, measure off across the = key. First, carefully open tive with duct or other durable tape the "control' distance and walk or run it the calculator's case and locate the con- assembly keep out dirt and moisture. to determine how many steps are re- tacts for the = key. Then solder a 5' to Slide the insole into your shoe and put quired to cover the course. (1.5- meter) or so length of 26 -gauge shoe. Turn on the calculator and Let us assume you wish to know how flexible stranded wire to each = switch on the many miles you have walked and have contact. Insulate the soldered connec- COPPER FOIL previously determined that it takes you tions with a layer of electrical tape. 1056 steps to walk a mile. (Note that a Now, test your hookups in the follow- TO step is two strides. If the switch is in your ing manner. Turn on the calculator and CALCULATOR = KEY right shoe, a step is completed every key in 1, +, 1. Touch together and sepa- time you set down your right foot.) Now, rate the free ends of the wires two times. subtract 1 from the total displayed by the With the first touch, the display should on each side of Place copper foil calculator. This is necessary because read 2 and with the second, 3. If the test insole hole and insulate with tape. the first step you take will register 2. If checks out properly, turn off the calcula- walk around we assume you stopped at 7200 steps, tor and reassemble it, routing the wires key in 1, +. 1. Now, as you read 2, then 3, then 4, simply divide this number by 1056 your out through the side of the case. If nec- the display should put weight on "control" number, using the calculator to essary, use a sharp knife to cut a slot to etc.. as you successively step. If you do obtain the number of miles walked. allow the wires to exit the case. No other the switch shoe with each these results, turn off the cal- Therefore, 7200/1056 6.82 miles. O modification is necessary . not obtain

PRI -1 DIGITAL LOGIC PROBE

Compatible with DTL, TTL, CMOS, MOS and Microprocessors using a 4 to 15V power supply. Thresholds automatically programmed. Automatic resetting memory. No adjustment required. Visual indication of logic levels, using LED's to show high, low, bad level or open circuit logic and pulses. Highly sophisticated, shirt pocket portable (protective tip cap and removable coil cord).

DC to > 50 MHZ 10 Nsec. pulse response $3695 120 K 11 impedance Automatic pulse stretch- ing to 50 Msec. *ADD $2.00 FOR SHIPPING Automatic resetting memory (N. Y. CITY AND STATE RESIDENTS ADD TAX) Open circuit detection Automatic threshold resetting Compatible with all logic families 4 -15 VDC Range extended to 15 -25 VDC with optional PA -1 adapter Supply O.V.P. to ± 70 VDC No switches /no calibration

OK MACHINE & TOOL CORPORATION 3455 Conner St., Bronx, N.Y. 10475 (212) 994 -6600 / Telex 125091 3 NO. 42 ON FREE INFORMATION CARD AUGUST 1979 CIRCLE

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 39 BY ROBERT GROVE

GOOD RADIO reception depends as much on a good antenna as it does on a "hot" radio receiver. This is espe- daily true with modem public- safety- band vhf /uhf scanning monitors, which almost invariably have high sensitivities in the range of 0.5 µV or better. Aside from the usual whip antenna supplied with the scanning monitor, there are few commercially made antennas available for working vhf and uhf. Fortunately, there is an alternative to a commercially made vhf /uhf antenna. A standard TV antenna can be "tailored" to provide excellent reception on the public safety bands. In this article, we will describe how this can be done and give you some idea of how the modified Make -it-yourself TV antenna stacks up against a popular high -performance discone antenna.

antenna Antenna Theory. The standard whip antenna supplied with scanning moni- improves reception tors is generally adequate for city -wide reception of repeaters and base sta- of tions. However, when an external antenna is connected to the scanner to im- public services prove weak -signal reception, all signal SNNER BEAM PINPOINTS THE ASTION! POPULAR ELECTRONICS

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 40 to beyond 174 Mhz in its X/2 mode and 550 MHz in its UHF CORNER from below 400 to beyond REFLECTOR 3X/2 mode. With the antenna erected, you will 1 note that its elements are angled for- LOG- PERIODIC ward. This is done to merge the front DIPOLE lobes of the characteristic cloverleaf pat- ARRAY tern that occurs on any 3X/2 dipole. The result is that the directivity of the antenna is considerably increased. When used for TV only applications, the Radio Shack Super Color Special (as well as the Model VU -90) antenna offers an average gain of 4 to 6 dB

(about 1 S unit) over a single dipole. Its front -to -back ratio is around 12 dB. An- Adding more tennas with more elements will provide will elements better gain and directivity figures. provide better Because the feed impedance for the gain and RIGID PVC is approximately 300 ohms or directivity. SUPPORT antenna less. a standard 4:1 TV Balun matching transformer is required between the an- line you will be us- ROTATOR tenna and the coaxial ing. You need not concern yourself about the impedance of the feed line: MAIN MAST either 50- or 75 -ohm coax will work fine. For cable runs in excess of 50' (15.2 m), use RG -8 /U foam dielectric coax. Al- though new dry 300 -ohm twin -lead feed cable is low in losses, when it gets old. wet, and cracked, it causes more prob- levels increase dramatically -including The TV antenna employs a log -peri- is lems than it is worth. It is for this reason the levels of local signals. This can lead odic design in which every element feed line The that coaxial cable is recommended in- to problems. The most serious forms of cross -connected to the of center -fed dustry -wide for two -way radio communi- scanning monitor interference are front - antenna is actually a series in length cation and commercial TV signal distri- end overloading and intermodulation dipoles, each slightly different fre- bution systems. distortion, recognized by their frequent to resonate at a slightly different recurrence throughout the tuning range quency. The dipoles are connected to a of the Modification. Referring to the draw- of the receiver. Images from aircraft common feedline. The response ing, saw off the entire boom section that and FM and TV signals elements is related to the logarithm of communication elements in name log - contains the 6" (15.2 -cm) that pop up in the middle of the public the frequency; hence. the front of the corner reflector. Be careful to safety bands are another problem. periodic dipole array. are not re- avoid damaging the longer element The problems that plague the public - Electrically, elements that re- closest to the reflector (this element is safety -band listener are especially se- sonant at the frequency to which a be- connected to the antenna's cross -feed vere in metropolitan areas. The problem ceiver is tuned at any given moment This system) or any of the reflector elements. is compounded with the use of omnidi- have like directors and reflectors. Next. cut the longest pair of angled rectional ground -plane antennas that re- endows the antenna array with both di- - elements to a length of 20" (50.8 cm) on spond equally well in all directions. What rectivity and gain. The elements of a log each side of the boom. This 40" (101.6 - is really needed to maximize reception is periodic antenna are incrementally wavelength cm) dipole is now cut for 140 and 420 a beam antenna with high forward gain shortened from the longest MHz. Now. cut the shortest pair of an- and greatly limited side and rear gain. at the lowest frequency to the shortest frequency. gled elements to 16" (40.6 cm) on each Such an antenna can be aimed at the wavelength at the highest side of the boom. This 32" (81.2 -cm) di- transmitting source to zero in on that sin- which gives the antenna a characteristic pole is now cut for 170 and 510 MHz. gle signal to the virtual exclusion of other V- shaped outline. frequen- Once the longest and shortest ele- signals that can interfere with and mask Each dipole is used at two fre- ments are trimmed to size, the remain- the desired signal. cies -its resonant half -wave (À /2) -wave (3À/2) ing elements can be proportionately A few modifications to a low -cost TV quency and its three -half longest element trimmed so that the outline of the anten- antenna can produce an excellent beam frequency. Hence, the 420 MHz, while the na will have a characteristic V shape. antenna for vhf /uhf public- safety -band performs on 140 and on 174 and You simply place a straightedge on each monitoring. We modified a Radio Shack shortest element performs the large side of the antenna so that it touches the "Super Color Special" (similar to the 522 MHz. Also, because of compared to extreme ends of the cut elements and Model VU -90) antenna for our purposes. diameter of the elements, very broad- locate the cut points for the remaining The results we obtained were so satis- their length. the dipoles are modified antenna elements. In the case of the Super Color factory that no further experimentation band. This makes the from well below 130 Special and Model VU -90 antennas. the was necessary. usable over a range 45 AUGUST 1979

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 41 third and second longest elements will be 17" (43.2 -cm) and 18" (45.4 -cm) long, respectively, on each side of the log periodic array's boom. Trim the longer corner reflector elements so that each of them is 16" long. Then lift the antenna to locate its new center of balance. Drill two new 1/4" (6.35 -mm) holes, properly spaced, Eye through -level the boom to accommodate the U bolt that fastens the antenna to its mast. Make certain that these holes are Weight drilled to permit the antenna to be oriented so that its elements point up and down after mast mounting. Also, make certain that the U -bolt hardware does not touch Watcher the aluminum wire that cross - connects the elements. Separate digital Mount the antenna on a 36" (0.91 -m) readout puts your length of 11/4" (31.8 -mm) outer -diameter exact weight right rigid PVC pipe. Do not substitute a metal pipe because it will interfere with the sig- before your eyes. nal path. The metal mast should be at Your present scale gives you a number for least X/4 away from the longest antenna every five pounds- and a Dine for the pounds in element. (Rigid PVC pipe can be between. To make matters worse, the ob- needle's at your feet. tained from any building supply house Our scale puts your weight where your and many hardware stores.) eyes are bold, red, -in easy -to -read Mount the antenna numbers. It's marvelous! You step on the and PVC pipe sup- scale and your weight's right there. A visual port on a rotator, following the cable - record of the pounds you shed. routing instructions faithfully. Connect The readout unit mounts with either self - the Balun adhesive clips or screws. The color's soft transformer to the antenna white. The physical size of the scale unit is and the coax feed line to the Balun. 10.5" x 10.5" x 2.5" and the digital readout unit Then coat the connections with silicone is 4.75" x 3" x 1.25 ". Try it on a 15-day money back guarantee. Call toll tree to charge it to adhesive to weatherproof them. any national credit cartesend your check for $49.95 plus $5.50 shipping and handling How It Performs. We made to Douglas Dunhill. (Ill. residents add sales compari- tax.) Complete with four AA batteries. son checks between the modified TV Watching your weight's never been easier antenna and an excellent or as nice. commercially available vhf /uhf discone monitor anten- Call Toll -Free na. Signals that were barely readable on 800- 621 -5554 vhf with the discone antenna came in Illinois residents please call 800 -972 -5858 substantially stronger with the modified (In operation 24 hours, 7 days a week) beam antenna. More important was the fact that signals from the back of the antenna were noticeably reduced and those off to the sides were deeply attenuated with the beam, all of which contribute to a reduction in interference and an overall improvement in reception. The modified beam performed even better on uhf than it did on vhf. Sig- nals improved from "barely- discernable" to "full- quieting." Computer controlled electronic Our experience accuracy with the modified beam makes it clear that Automatically adjusts to zero this antenna is 300 lb. capacity an excellent choice for listeners who are A fraction of the price of doctor -type plagued by strong nearby transmitters pedestal scales without a digital readout and experience weak incoming signals. The modified beam even has the added advantage that it works well on the DouglasDouglassinc. hi// DURUTY 2 -meter amateur radio band; just be Dept. 53 -2378 careful to Ten Douglas Dunhill Drive, Oak Forest, IL 60452 avoid pumping more than a © Douglas Dunhill Inc. 1979 few watts into the Balun to avoid over- heating. Happy listening. O CYRCILE 46 NO. 18 ON FREE INFORMATION CARD POPULAR ELECTRONICS

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 42 BASIC programs for Ohm's law, resonance, and inductive formulas using a Level -1 machine with 4K of RAM SIMPLE TRS -80 PROGRAMS SOLVE ELECTRONICS CALCULATIONS BY ROY BABYLON

the impedance. The square -root THE FOLLOWING programs were mine the unknown resistance; lines 110 and /or used in determining resonant designed to be run on a Level -1 through 130 are for current, while lines subroutine frequency is called at line 220. TRS -80 microcomputer having 4K of 145 through 160 are used to determine re- memory. All the programs are self - the voltage. Once the current (I) and Formulas. Table 3 illus- prompting when run and are also readily sistance (R) have been determined, line Inductive trates a program that will determine in- adaptable to any other BASIC. (The 295 displays the wattage. stantaneous voltage, inductance of a square -root subroutine can be elimi- in single -layer coil, inductive /resistive time nated if your particular BASIC has a Resonance. The program shown of a constant, the values of series and /or -in square -root function.) Table 2 can determine frequency built induc- tuned circuit when C and L are known, parallel inductors, the Q of a coil, and impedance of an in- Ohm's Law. This program, shown in or can determine either C or L if the de- tive reactance one of ductive /resistive circuit. The only sub- Table 1, is fairly short and has no sub- sired resonant frequency and routine used (square root) is called at routines. Line 40 selects the unknown these two elements are known. The pro- line 720, with this subroutine residing at resistance, voltage, current or power. gram will also determine the Q of a se- line 30000. Lines 70 through 100 are used to deter- ries or parallel tuned circuit, bandwidth Table Resonance (Tuned Circuits) Table 1 -Ohm's Law 2-

5 CLS 15 CLS 10 P.T.(15); "VARIOUS FORMULAS 20 P.T. (20); "OHM'S LAW FORMULAS" ON RESONANT FREQUENCY" 30 P. "SELECT NUMBER FOR DESIRED FUNCTION" 20 P. "ENTER NUMBER OF DESIRED FUNCTION "; 40 IN. "RESISTANCE= R, CURRENT =C, VOLTAGE =V, P. "RESONANT FREQUENCY (FO) #1" POWER =P "; A 30 40 P. "UNKNOWN INDUCTANCE (L) #2" 60 IF A =R, G.70 #3" 50 P. "UNKNOWN CAPACITOR (C) 62 IF A =C, G.110 60 P." Q OF SERIES OR PARALLEL CIRCUIT (Q) #4" 65 IF A =V, G.145 70 P. "BANDWIDTH (BW) #5" 67 IF A =P, G.180 80 P. "IMPEDANCE, SERIES OR PARALLEL (Z) #6" 70 IN. "ENTER VOLTAGE IN VOLTS "; E 90 IN. "UNKNOWN FACTOR IS NUMBER ";U 80 IN. "ENTER CURRENT IN AMPERES "; I IF U= 1,G.170 100 P. "THE RESISTANCE EQUALS ";E /I;" OHMS" 100 IF U = 2,G.240 105 END 110 110 IN. "ENTER VOLTAGE IN VOLTS ";E 120 IF U= 3,G.280 120 IN. "ENTER RESISTANCE IN OHMS ";R 130 IF U = 4,G.320 130 P. "THE CURRENT IS EQUAL TO ";E /R;" AMPERES" 140 IF U= 5,G.360 6, G .520 140 END 150 IF U = OF INDUCTOR IN MILLIHENRIES ";L 145 IN. "ENTER CURRENT IN AMPERES ";I 170 IN. "ENTER VALUE OF CAPACITOR IN MICROFARADS ";C 150 IN. "ENTER RESISTANCE IN OHMS ";R 180 IN. "ENTER VALUE *(C /1 E6) 160 P. "THE VOLTAGE IS ";I *R;" VOLTS WITH ";R;" OHMS 210 X= (L /IE3) AND ";I;" AMPERES" 220 GOS.30030 FREQUENCY OS ";.159/Y;" HERTZ" 170 END 230 P. "THE RESONANT 180 IN. "ENTER MISSING VARIABLE R,I,E ";B 235 END IN. "ENTER RESONANT FREQUENCY (FO) DESIRED ";F 190 IF B= R, G.210 240 250 IN. "ENTER CAPACITOR VALUE IN MICROFARADS ":C 195 IF B=1, G.240 L= .0254/(F`F) *(C /1 E6) 200 IF B=E, G.270 260 P. "THE INDUCTOR NEEDED IS ";L'1000;" MILLIHENRIES' 210 IN. "ENTER CURRENT (I) ";I 270 END 220 IN. "ENTER VOLTAGE (E) ";E 275 IN. "ENTER RESONANT FREQUENCY DESIRED ";F 230 P -I`E 280 INDUCTOR VALUE IN MILLIHENRIES ";L 235 G.295 290 IN. "ENTER E3) 240 IN."ENTER VOLTAGE (E) ";E 300 C= .0254/(F'F)'(L/1 P. "THE CAPACITOR NEEDED IS ";C *1 E6;" MICROFARAD s- 250 IN. "ENTER RESISTANCE (R) ";R 310 END 260 P= (E *E) /R 315 THE REACTANCE (XC OR XL) IN OHMS ";X 265 G.295 320 IN. "ENTER THE SERIES RESISTANCE IN OHMS ";R 270 IN. "ENTER CURRENT (I) ";I 330 IN."ENTER P. OF THE CIRCUIT IS ";X /R;" UNITS" 280 IN. "ENTER RESISTANCE (R) ";R 340 "THE Q END 290 P= (l'I)*R 350 IN. UNKNOWN, Q =Q, FO-F, BW =B ";X 295 P. "THE POWER IS ";P;" WATTS" 360 "ENTER 300 END 370 IF X= Q,G.400 47 POPULAR ELECTRONICS

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 43 380 IF X= F,G.440 270 END 390 IF X = B,G.480 280 IN. "ENTER THE VALUE OF INDUCTANCE 400 IN. "ENTER FO IN HERTZ ";F IN HENRIES ";L 410 IN. "ENTER BW (F2 -F1) IN HERTZ ";B 290 IN. "ENTER THE VALUE OF RESISTANCE 420 P. "THE Q IS EQUAL TO ";F /B;" UNITS" 430 END IN OHMS ";R 300 T =L /R 440 IN. "ENTER THE Q OF THE CIRCUIT";Q 310 P. "THE TIME CONSTANT IS ";T; 450 IN."ENTER THE BW (F2-F1) IN HERTZ "SECONDS" ";B 315 END 460 P."THE RESONANT FREQUENCY (FO) 320 IN. "ENTER IS ";Q'B;" HERTZ" THE NUMBER OF INDUCTORS ";B 330 470 END IF B =2 G.360 340 IF B =3 G.420 480 IN."ENTER RESONANT FREQUENCY (FO) IN HERTZ ";F 350 IF B =4 G.490 490 IN."ENTER THE Q VALUE ";Q 360 IN. "ENTER VALUE OF L1 500 P. "THE BANDWIDTH IS ";F /Q;" IN HENRIES ";A HERTZ" 370 510 END IN. "ENTER VALUE OF L2 IN HENRIES ";B 380 C =A +B 520 IN. "ENTER VALUE OF INDUCTOR IN MILLIHENRIES ";L 390 P. "THE TOTAL SERIES INDUCTANCE 530 IN. "ENTER FREQUENCY IN HERTZ ";F IS";C; "HENRIES" 400 D= (1 /A) +(1 /B) 535 IN. "ENTER RESISTOR VALUE IN OHMS ";R 405 P. "THE TOTAL PARALLEL INDUCTANCE 540 P. "AT SERIES RESONANCE, XL AND XC CANCEL IS ";1 /D; "HENRIES" THEREFORE Z =";R 410 END 550 P= (6.28) *(F) *(L /1 E3) 420 IN."ENTER 560 Q =P /R VALUE OF L1 IN HENRIES ";A 430 IN. "ENTER VALUE OF L2 IN HENRIES ";B 570 P. "THE PARALLEL IMPEDANCE IS EQUAL 440 IN. "ENTER VALUE TO ",P'Q;" OHMS" OF L3 IN HENRIES ";C 450 D =(1 /A) +(1 580 END /B) +(1 /C) 460 P. "THE TOTAL 30000 END INDUCTANCE IN SERIES IS ";A +B +C; "HENRIES" 30010 REM *SQUARE ROOT* INPUT X, OUTPUT Y 470 P. "THE TOTAL INDUCTANCE IN 30020 REM ALSO USES W & Z INTERNALLY PARALLEL IS ";1 /D; "HENRIES" 30030 IF X -O T. Y= O:RET. 480 END 30040 IF X > O T. 30060 490 IN. "ENTER VALUE OF L1 IN 30050 P."ROOT OF NEGATIVE NUMBER ?":STOP HENRIES ";A 500 IN."ENTER 30060 Y= X'.5:Z =O VALUE OF L2 IN HENRIES ";B 510 IN. "ENTER 30070 W= (X /Y -Y)'.5 VALUE OF L3 IN HENRIES ";C 520 IN. "ENTER VALUE OF L4 IN HENRIES 30080 IF (W =0) + (W =Z) T. RET. ";D 530 E =(1 /A) +(1 30090 Y =Y +W: Z= W:G.30070 /B) +(1 /C) +(1 /D) 550 P. "THE TOTAL PARALLEL INDUCTANCE IS ";1 /E; "HENRIES" Table 3-- Inductive Formulas 540 P. "THE TOTAL SERIES INDUCTANCE IS ";A +B +C +D; "HENRIES" 555 END 2 CLS 570 IN. "ENTER INDUCTOR VALUE IN HENRIES 10 P."AFTER EACH SOLUTION, ";L PRESS R. ENTER 580 IN. "ENTER THE FREQUENCY TO BEGIN." IN HERTZ ";H 590 IN. "ENTER RESISTOR VALUE IN 15 P.T.(15) "VARIOUS OHMS";R INDUCTIVE FORMULAS" 600 X= 6.28 *H'L 20 P. "ENTER THE NUMBER NFXT TO DESIRED 610 Q =X /R FUNCTION" 620 P. "THE REACTANCE OF THE CIRCUIT 30 P. "INSTANTANEOUS VOLTAGE #1" IS ";X; "OHMS WITH A Q OF ";Q 40 P. "INDUCTANCE OF A SINGLE LAYER COIL #2" 630 END 50 P."INDUCTIVE /RESISTIVE TIME CONSTANT #3" 640 IN. "ENTER THE VALUE OF INDUCTOR IN 60 P. "SERIES AND PARALLEL INDUCTORS #4" MILLIHENRIES ";L 70 P. "QOFA COIL #5" 650 IN. "ENTER THE FREQUENCY IN HERTZ ";H 80 P. "INDUCTIVE REACTANCE (XL) #6" 660 X= (6.28)`(H)'(L/1000) 90 P."IMPEDANCE OF INDUCTIVE /RESISTIVE 670 CIRCUIT #7" P. "THE REACTANCE OF THE CIRCUIT IS ";X; "OHMS" 100 IN. "FORMULA DESIRED";F 680 END 110 IF F =1 G.160 690 IN. "ENTER THE VALUE OF INDUCTIVE REACTANCE 120 IF F=2 G.220 IN OHMS ";P 130 IF F=3 G.280 700 IN. "ENTER THE VALUE OF RESISTANCE 140 IF F=4 G.320 IN OHMS ";R 144 IF F=5 G.570 710 X= (P'P) +(R'R) 145 IF F=6 G.640 720 GOS. 30030 146 IF F=7 G.690 730 P. "THE IMPEDANCE OF THE 160 IN. "ENTER VALUE CIRCUIT IS ";Y; "OHMS" OF INDUCTANCE IN HENRIES ";L 740 END 170 IN. "ENTER CHANGE IN CURRENT (12 -I1) IN AMPS ";I 30000 END 180 IN. "ENTER CHANGE IN TIME (T2 -T1) IN SECONDS";T 30010 REM *SQUARE ROOT *INPUT X, 190 E= L *(I /T) OUTPUT Y 30020 REM ALSO USES W AND Z INTERNALLY 200 P."THE VOLTAGE DEVELOPED IS ";E;"VOLTS" 30030 IF X =O T. Y =0 :RET. 210 END 30040 IF X > 0 T. 30060 220 IN. "ENTER NUMBER OF TURNS ";N 30050 P. "ROOT OF A NEGATIVE NUMBER ?" :STOP 230 IN. "ENTER RADIUS OF COIL IN INCHES ";R 30060 Y= X *.5:Z =O 240 IN. 'ENTER LENGTH OF IN COIL INCHES ";D 30070 W= (X /Y -Y) *.5 250 L= (N'R) *(N *R) /(9'R) +(10'D) 30080 IF (W= O) +(W =Z) T. RET. 260 P. "THE INDUCTANCE IS ";L;"MICROHENRIES" 30090 Y =Y +W :Z =W : G.30070 48 AUGUST 1979

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 44 The Art of EQUALIZATION An expert tells how to "sweeten" instruments and achieve that special recorded "sound"

BY ETHAN WINER

is fine for touching up (I. A growing number of audio While this enthusiasts are using equalizers reproduction, it is of virtually no to shape a stereo system's help in correcting for narrowband frequency response, whether to colorations, which are often highly in "adjust" a room or for creative disturbing. For example, a peak recording purposes. the response of an audio system in the low -to- middle treble region 4 An equalizer is nothing more than a device to allow frequency can produce a shrill or scratchy response of an audio signal path quality that a normal treble control to be adjusted in some way. Thus, cannot effectively tame. Turning conventional bass and treble con- down the control enough to elimi- trols qualify as charter members nate the shrillness kills too much mu- of the club. More often, however, of the highest treble, robbing the term implies equipment that is sic of clarity and sparkle. Similar- more complex and sophisticated, ly, using a bass control to correct re- such as that used by a mixing en- tubbiness or muddy bass gineer. Let's take a look at some of sponse also falls short of success. the reasons equalization (EQ) is Turning the control down to re- useful and how its implementation lieve such midbass exaggeration has developed into a high art. would simply remove the deepest '' Standard bass and treble tone frequencies so important to life- controls are broadband devices like reproduction, while perhaps that have greatest effect at the fre- still allowing some muddiness to quency extremes; that is, the high- persist. There's got to be a better est highs and the lowest lows. way -and there is. (conónued ovarleal) 49 AUGUST 1979

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 45 plication is yet another equalizer referred to by many as the PEAK SHELF "console type." Fig. 1. Layout of a typical Virtually front panel for an equalizer. all professional mixing consoles Note that it has controls use this sort of device, with one avail- for treble, midrange, and KHz. able for each mike or line input. Addi- bass as well as a 3- tional equalizers are often devoted to position 5.0 low -cut filter. 3.2 8.0 echo and reverb lines. 2.0 12 T A typical front panel for such an equalizer (Fig. 1) shows that we're back to the R bass -mid -and -treble format. But there E are no less than five different frequency B choices for treble, eight for midrange, L and another five for bass. In addition, a Enter the Graphic Equalizer. The 0 -2 +2 E 3- position low -cut filter is provided, as is graphic equalizer has become very pop- -4 +4 an in /out switch for instant comparison ular in recent years. It is called "graphic" of "before" and "after." Here we have a because, as the front -panel sliders are +6 device that can exercise control over fif- adjusted, their positions give an approxi- -9 +9 teen different frequency ranges and also mate display of the resultant frequency -12 +12 be made small enough to fit in quantity response. Each of the five to ten or more dB. into a single mixing board. (A large con- frequency bands into which the audible sole will have some 30 or more of these, spectrum is divided by these devices is Hz. so size is an important factor.) Though adjustable via its own boost /cut control. all 15 frequencies cannot be adjusted si- Instead of broad adjustments of treble, 620 1K 400 multaneously as with the graphic, this bass, and maybe the midrange (pres- 1.6K rarely is needed in a "one- for -each- ence), we now have independent control 320 2K M mike" situation. Besides, you can al- over the low bass, midbass and high 200 3.2K ways "patch -in" a graphic if you abso- bass, low midrange, etc. D lutely have to. If we attack that shrill midtreble em- R The last control, the PEAK /SHELF phasis with an octave -band graphic 0 A switch, changes the basic shape of the equalizer, we should be able, more or -2 +2 response curve being created. This is less, to correct for only the troublesome +4 N shown in Fig. 2, where in both cases tre- peak. We'll have to settle for "more or G +6 ble frequency has been set to 3.2 KHz less" because it is highly unlikely that E and 12 dB of boost is applied. The upper any response anomaly could corre- -9 +9 curve represents the switch in the PEAK spond exactly to the adjustments of -12 +12 position while the lower curve shows a even a ten -band device. Therefore, dB. SHELF. Notice that, while the treble peak many professional sound contractors, affects mainly the specified frequency, recording studios and audio enthusiasts Hz. there is still some influence seeking precise on nearby results use the even 125 frequencies, 80 200 whether boosting or cut- greater resolution afforded by 1/2- octave ting. In the 50 SHELF position, the boost or equalization. The 1/2- octave graphics 320 cut reaches its maximum at that fre- usually have 27 or so bands, and can, quency and remains there for all higher when teamed up with the proper mea- frequencies. The same principle applies suring equipment, be used to make just to the bass control. The boost or cut about any high -quality speaker system B reaches maximum at the named fre- flat to within a dB or so over much of the A -2 0 +2 quency but instead continues downward audible range. But there's much more to +4 S thereafter. The midrange has no shelf EQ than simply correcting nonideal S capability, but more expensive consoles loudspeakers or listening rooms. -6 +6 generally have a second, additional mi- -9 +9 drange control for added flexibility. Fig. 3 EQ In the Studio. Now, let's look at -12 +12 contains bass shelf cuts at four different the professional recording studio with its frequencies. Fig.4 illustrates the effect of abundant knobs, lights, and buttons. dB. varying the bandwidth of a midrange dip. This is where the multiple original tracks Bandwidth? Well now we're talking are adjusted in level and equalized be- PEAK SHELF about the "parametric equalizer," the fore being mixed together to comprise most recent addition to the EQ machine the final two -track product. The key family. phrase is "before being mixed." Where- as the home listener can alter the pro- LOW FILTER IN Parametric Power. In a sense, the gram only in its entirety, the recording parametric equalizer is the most power- engineer can -and must -equalize 010 ful of the equalizer types, allowing con- sounds picked up by each microphone 40 Hz. OUT 80 Hz. OUT tinuous adjustment of all equalization separately. The tool of choice for this ap- parameters (hence the name). It is 50 POPULAR ELECTRONICS

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 46 avoided because unpleasant resonances or other bad effects may show up when the mix is heard on different speakers. In fact, most recording studios have alternate speaker systems available for making instant comparisons. Broad -bandwidth settings accentuate a larger range of frequencies. Paramet- ric equalizers are inherently peaking rather than shelving devices, but a wide setting can reasonably approximate a shelf. Do not confuse peaking with boosting, though. Peaking refers only to the shape of the curve, not to whether it is being boosted or attenuated. All this newfound versatility, however, is not without some potential drawbacks. Probably the most obvious is the lack of precise repeatability. Since the operating controls are continuously variable, it settings ex- FREQUENCY (H ) may be difficult to recreate actly to perhaps undo something you lat- 2. The top switch in Fig. 1 changes the basic shape Fig. er don't like. Another factor is noise. Pa- the response as shown here to a peak (top) or shelf (bottom of rametric equalizer designs generally use more op amps per frequency band than do graphic and console types. This of means that cumulative noise can be structured similarly to the console equal- extends is determined by the setting more of a problem, especially when izer, but there are differences worth the bandwidth control. When set to NAR- large amounts of boost are used. Distor- elaborating. First, and probably most im- ROW, it allows only a small range of fre- is tion can build up in a similar fashion, portant, all controls of a parametric are quencies to be influenced. This partic- though the latest high -slew, low -noise continuously adjustable. Potentiome- ularly useful for suppressing ringing or from, say, FET input op amps are bringing both of ters, rather than discrete, switch -related removing extraneous tones these factors under better control. Still, resistors, are employed as the tuning drums without changing the basic sound most commercially available units have elements, allowing a choice of virtually character. On the other side of the coin, to a switch to bypass each band or section any center frequency. Boost and cut this narrowband setting can be used if it's not needed. controls are also continuous and typical- emphasize a single tone and can often While studios have not unanimously ly offer a range of ±20 dB, more than is effectively "purify" a muddy- sounding traded in all their old equalizers for para- characteristic of other equalizer types. tom tom. Of course, this is not a substi- metrics, many have added at least one Another important difference is the in- tute for proper tuning of the drums, but And some of the newer mixing . . or two. clusion of a bandwidth control. It was ex- when all else fails. and boards are showing up with equalizers plained previously that in boosting or Except when dealing with drums instru- having a sweepable midrange band or a cutting a peak, the effect "spills over" to perhaps some tuned percussion narrow - two- position switch for sharp or broad adjacent frequencies. How far away ments like triangles or cowbells, usually be peak shape selection. So a few of the from the indicated center this influence bandwidth boosts should

11111111111111 111111111111

Fig. 3. Response curies show changes for 11111111111111War bass shelf cuts at four different frequencies.

100 500 10 50 ÑIFREQUENCY (Hz) ÌÌÌ51 AUGUST 1979

www.americanradiohistory.com / IPR2017-01058 Garmin EX1021 Page 47 conveniences are added without having your recordings owing to extraneous vi- nately, as the distance between source to go to a full parametric design. brations such as walking on non -con- and mike increases, acoustics of the Now that we've looked at the different crete floors, operating air conditioners, room begin to affect the sound. This isn't types of devices and know how they op- and the like. always bad -a good room might add a erate, how can we use EQ to best Treble is often accentuated to in- warmth and character unobtainable in advantage? When and how would a pro- crease clarity or to enhance the pres- any other manner. But when a close -up fessional recording engineer use it? ence of a vocal or string part that might sound with lots of presence is desired, Well, first we should note that equaliza- otherwise be lost in the mix. Horns, cym- equalization in the form of treble boost tion can be used in two basic ways: as bals, a acoustic guitars and many other in- or midrange cut can often do tool the trick. and for personal taste. struments can also be greatly enhanced in this way, but the engineer must know Seasoning To Taste. While no one EQ As A Tool. If you reflect on the task where the formants (the most important yet has found a definitive way to tell of a recording engineer, the idea that he characteristic frequencies for the vari- what sounds good and what doesn't, re- is going to run into problems in his work ous instruments) lie. Boosting high tre- cording engineers have developed vari- will not seem surprising. The difficulties ble on an instrument with little output in ous techniques for emphasizing what encountered may lie in the areas of in- that region will do nothing but add hiss. they consider to be the more pleasant strumental balances, equipment over- In fact, when dealing with such an instru- qualities of musical sounds. In fact, load, signal -to -noise ratio, and frequen- ment, it is often possible to make a sub- many engineers pride themselves on cy response, to name a few possibilities. stantial improvement in the signal -to- "getting their own sound." This is an When the problem can be traced to fre- noise ratio by carefully reducing the un- area of taste, so naturally there are no quency response -and quite a few necessary high- frequency bandwidth hard, fast rules to apply. Some good can -the equalizer becomes an ex- with treble control on each channel for starting points can be established, tremely valuable tool. frequencies beyond the range of inter- though, as follows. Generally speaking, For example, one problem that occurs est. This is most effective when done in you would boost treble for clarity or pres- regularly is caused by the "proximity ef- mixdown, as tape hiss will also be re- ence (the midrange can affect this too), fect," a bass boost that happens when duced. For this same reason, when tre- and bass for fullness or punch. Some- using a directional microphone in close - ble boost is employed, it is usually best times it seems that no matter how much miked situations. Here, the low filter applied ahead of the recorder. top or bottom you add, something is still would be your best bet. First, it will at- EQ can also help to correct for poor not right. Often what is involved is one or tenuate the excessive low- frequency room acoustics. Recording live, even more unpleasant resonances caused, signal before it enters the actual EQ cir- the most accurate mike may not capture as mentioned earlier, by either micro- cuitry, minimizing the chance of over- that terrific sound you hear when you phone chracteristics or placement, or load; second, it will leave the bass con- stand right next to the instrument. Close - even by bad qualities within the instru- trol free for other uses if needed. (If the miking may help, but in many cases this ment itself, especially if it is out of adjust- mike has its own switchable low -cut filter is impractical since many instruments do ment or of low quality. Eliminating these built in, using that to keep the unwanted not radiate sound from a single point midrange resonances will often improve frequencies out of the preamp as well source. the sound and may minimize a need to will give even more overload protection.) Consider a grand piano, string bass, boost highs and /or lows. Another proper occasion to use the xylophone, or gong. All of these radiate To find these magic EQ settings, start low filter is when recording vocals - sound close from a large surface area, leaving by turning off all but the principal micro- up. Not only because of the proximity ef- no single mike position that would be phone that can pick up the instrument fect just mentioned, but also to minimize close to all parts of the source. Such you're working with. If it's the snare "popping" P's, which contain a lot of large instruments require a more distant drum, for example, shut off the tom and low- frequency energy. Moreover, rum- microphone placement if a well - kick mikes. They'll interact later anyway, ble and low- frequency mud can enter balanced pickup is to be had. Unfortu- but the less you need to concern your- +5

0 malls Imo

Fig. 4. Response curves showing the effect of

z ur ying the bandwidth t `ENr of a midrange dip. -15'. Ï -20 10 50 100 500 IX FREQUENCY (Hz)

52 POPULAR ELECTRONICS

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 48 ment only so far without losing its identity; The chart given below lists some com- SPECIFIC INSTRUMENTS every instrument can't be full, deep. bright. mon instruments with frequencies at which AND sparkly. etc.. all at once. Leave some roc- boost or cut can be effectively applied to THEIR CHARACTERISTIC for contrast. cure various problems or obtain certain ef- FREQUENCIES (4) Take a break once in a while. Critical fects. Indicated frequencies are necessari- listening tends to numb one's senses after ly approximate, as no two instruments awhile. especially if you like to run sound exactly alike. The column marked tors at high levels. Sounds may aocaz- "comments" gives cautions or observa- memory is shorter than you think; return to your- very different to you the next morning. tions based on experience. They should be a flat setting now and then to remind (5) Don't be afraid to experiment. If yo'_ taken as guidelines rather than prescrip- self where you began. can't find just what you want with equaliza- tions, for every situation is different and ev- (2) Make side-by -side comparisons this will help tion, try moving the mike a little; if that ery recordist has his own sonic goals. against commercial releases; won't work. move the instrument. But. A few general hints may contribute to the you in judging overall blend. instru- most of all. keep trying. effective use of equalization: (1) Your (3) You can tailor the sound of an

COMMON FREQUENCIES FOR EQUALIZATION Comments Instrument Cutting Boosting Additional Tend towards thin when Human Voice Scratchy at 2 kHz. Hot at 8 or 12 kHz. 3 kHz. blending many voices. Nasal at 1 kHz. Clarity above Popping p's below Body at 200 -400 Hz. 80 Hz. at 5 kHz. Not too much bottom Piano Tinny at 1 -2 kHz. Presence when mixing with rhythm Boomy at 320 Hz. Bottom at 125 Hz. section. kHz. Electric guitar Muddy below 80 Hz Clarity at 3.2 Bottom at 125 Hz. kHz. Acoustic guitar Tinny at 2 -3.2 kHz. Sparkle above 5 Boomy at 200 Hz. Full at 125 Hz. at 62Ó Hz. Sound varies greatly depending Electric bass Tinny at 1 kHz. Growl strings used. Boomy at 125 Hz. Bottom below 80 Hz. on type of 3.2 -5 kHz. String bass Hollow at 620 Hz. Slap at Boomy at 200 Hz. Bottom below 125 Hz above 2 kHz. Also try adjusting Snare drum Annoying at 1 kHz. Crisp Full at 125 Hz. tightness of snare Deep at 80 Hz. wires. Usually recorded with Kick drum Floppy at 620 Hz. Slap at 3.2 -5 kHz. head removed. Boomy below 80 Hz. Bottom at 80 -125 Hz. front drum Place blanket inside of drum resting against head. kHz. Tuning head tension Tom toms Boomy at 320 Hz. Slap at 3.2 -5 Bottom at 80 -200 Hz. is extremely important. above 5 kHz. Record these instru- Cymbals, bells, Annoying at 1 kHz. Sparkle ments at conservative tambourines levels, especially at slower tape speeds. kHz. Horns and strings Scratchy at 3.2 kHz Hot at 8 or 12 2 Honky at 1 kHz. Clarity above kHz Muddy below 125 Hz Lush at 320 -400 Hz.

ly, too much ultrasonic content can dam- self with now, the better. Next, try boost- optimum point is reached. The same tweeters and overload the tape ing some different midrange frequen- general plan can work for boosting, al- age deck. Even with VU meter indicators in cies, adding at least 10 or 15 dB, to though then you'd be looking for fre- safety is not guaranteed; limit- make the changes obvious. Where you quencies that make the sound better the black, meter frequency response some- start will naturally depend on the instru- when boosted. ed them from giving a true ment. Since physical resonances of in- When adding treble or bass, be sure times prevents picture. Also, VU meters tend to miss struments usually fall between, say, 100 the controls are doing what you expect and other If obtain an apprecia- sharp transients from drums Hz and 1 or 2 kHz, these frequencies them to. you don't percussion instruments; the pointer sim- are likely starting points. After determin- ble improvement, move on to a different ply cannot move fast enough. Pre - ing which one sounds the worst, return frequency. Remember, a lot of boost at exces- emphasis within the deck also can ag- to the flat setting momentarily to allow the extreme low end can route gravate the situation, so be particularly your ears to readjust, and then cut the sive infrasonic energy to the loudspeak- at the slower tape speeds. chosen frequency in small steps until the ers, which could damage them. Similar- careful 53 AUGUST 1979

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 49 than the required rms voltage cutout BUILD , point of the speaker system. This allows for the voltage drop across the rectifier circuit. The diodes and capa- Speaker citors should have twice the peak voltage rating of the signal passing through them. The components specified in Fig. 1 are for a 4- and an 8 -watt Protection Circuit unit and will protect a speaker system rated at 5 to 10 watts with a 20% de- BY MIKE ROGALSKI rating factor for safety. Resistor R1 can be bypassed to move the operating point of K1 down AFTER LONG periods of listening and its contacts automatically close, to 4 watts. to reproduced music played at a removing R2 from the circuit. high volume level, it's not uncommon Adjustment. Make certain that the for one's hearing to become insensi- Construction. The simplicity of the common of each amplifier output cir- tive to average loud sounds. As a re- protection circuit lends itself to just cuit is connected to the common of sult, the listener often turns up the about any method of construction de- the speaker protector and observe gain to compensate for this dimin- sired. For those who wish to use print- proper speaker phasing when con- ished sensory perception. ed- circuit construction, an actual -size necting the device into your audio sys- The best way to protect our hearing etching- and -drilling guide and compo- tem. With a relay whose coil re- ability-and do a good turn for our nents- placement diagram are given in sistance is about 100 ohms, the circuit speaker systems -is to put an upper Fig. 2. Once wired, this compact pc shown in Fig. 1 will cut out at 4, 8, or limit on the decibel level our sound assembly can be permanently mount- 12 watts if the value of R1 is 0, 50, or systems can generate. This is pre- ed inside the speaker system's enclo- 100 ohms, respectively. Since the cir- cisely what the automatic audio -over- sure or connected directly to the cuit is basically a voltage divider, dou- load /speaker -protection circuit de- speaker terminals. bling the value of R1, shifts the rms scribed here does. Relay Kl should have a dc coil re- point 50% higher. You can also ex- There are, of course, many circuits sistance of about 100 ohms and a dc periment with the value of R2 to obtain that use zener diodes and SCRs to pull -in rating of at least 2 volts less the low level desired. shunt power to dummy loads. Most act too fast, however. This R2 causes im- 5011 PARTS LIST portant dynamics such as drum rolls, CI -I (x) -µF, 50 -volt electrolytic cymbal crashes, and trumpet blasts to DI thru D4-- Silicon rectifier diode (see text) get "crunched." A slow- acting thresh- K I -Spst relay with 100 -ohm dc- resistance old coil (American Zetler No. A 535 sensor that has built -in hysteresis RED -1I -2 or similar) (see text) and a comparator circuit would be ex- R I -Value depends on power protection lev- cellent for providing automatic level el 0 ohms for 4 watts: 50 ohms for 8 watts: limiting, but it requires a power supply. 100 ohms for 12 watts The speaker -protection system here, R2 -50 -ohm, 1/2-watt resistor Note: The following on the other hand, is far simpler in cir- items are available from Micpro Sound, 1012 Disston St., Phila- cuitry, self -powered, automatic in ac- delphia, PA 19111: Pc board for $3.00: tion, and connects directly between hoard and all components (state R 1 wattage) the power amplifier and the speaker for $10.0 postpaid. RI system it is to protect. It is also inex- 50 -loon pensive to build. (SEE TEXT) /Fig. 1. The self-powered circuit, BLK BLU left, automatically reduces speaker level when peaks occur. About the Circuit. The output from the power amplifier to the speaker - protection circuit is shown in Fig. 1. BLK BLU (The rectifier diodes should have a forward resistance of approximately R'- -CI.- 4- 600 ohms to introduce minimal signal -DI-K distortion.) The signal then goes to the KD2--02 normally -closed relay contacts and J R2 -D3-K out to the speaker system. D4- At high signal levels, the charging circuit consisting of Rl and Cl gener- © -KI CONTACTS ates sufficient voltage levels to ener- O O =KI COIL gize K1 and open its contacts. When K1 energizes, R2, is connected in se- Fig. 2. Actual -size ries with the speaker etching system to drop and drilling guide, right; the sound level. Then, when the input component placement above. signal level drops, Kl de- energizes 54 POPULAR ELECTRONICS

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 50 By Harold Wright SPACE -AGE ELECTRONIC PROJECTS FOR BOATS part two

foolproof. While LAST MONTH, we showed you vari- ple that it is just about your own float switch if ous ways to use the LM3914 dot/ you can fabricate it is hardly worth the effort be- bar display driver in instruments for your you wish, plastic units for boats are boat, new approaches to water -level de- cause all- from marine hardware stores tection, and a rudder -angle indicator. In available this second and final part, concentration at low cost. A second bilge alarm is shown in Fig. is on bilge -water warning systems, elec- a pair of electrodes is sealed trical- system transient protection, and a 11. Here, insulating housing that is mounted unique digital tachometer. in an low in the bilge. A small screen sur- elements to pre- Bilge Alarm. There are a number of rounds the probe -like by debris. ways to provide bilge -water warning. vent bridging In fabricating the probe shown in Fig. One of the simplest is the float- actuated- 11, two small brass bolts are mounted switch system shown in Fig. 10. Here, a disc of insulating board and sealed tube containing a reed switch is on a small through a pair of resistors surrounded by a float with a built -in mag- are connected cable that goes to the in- net. The float rides up and down the to a water -tight The disc fits one end of tube with increasing and decreasing wa- strument panel. plastic plumbing fitting. ter level, closing and opening the a 3/4" (19.1 -mm) rear of the assembly is switch's contacts. Then the whole to seal in the probe With the actuating switch assembly filled with epoxy cable connections. placed low in the bilge, the float lifts with ends, resistors, and finished, there should rising water level. At some predeter- When potting is at the probe tips, mined point, the contacts of the reed be no place, except can bridge the circuit. switch close and the alarm sounds or/ where moisture the probe tips, and an indicator light comes on. Alterna- When water bridges actuates the alarm. tively, the system can be rigged to auto- the SCR fires and will continue to matically turn on the bilge pump as well The Sonalert alarm after the water level drops as sound an alert. sound, even it bridges the There is nothing electronic about the below the point where the switch is opened. To system shown in Fig. 10, but it is so sim- probe tips, until

Projects in this concluding part cover a bilge -water alarm, a tachometer and voltage- transient protection 55

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 51 rearm the alarm, simply close the switch. A third type of bilge alarm is illustrated in Fig. 12. This system is designed for PLASTIC boats with multiple bilge spaces that are TUBE separated by watertight bulkheads. An REED SWITCH audible alarm and a visual indicator to tell you which MAGNET bilge has water in it are re- (EPDXIED TO FLOAT) quired in this system. The sensors in this circuit are LM1830 Fig. 111. A simple tgpe of FLOAT fluid- detector ICs. When water bridges bilge-water warning the probes, the output of the associated system is shown here. IC goes high and turns on the pair of Details of float- actuated transistors connected to it. Output con- switch are at top. nections to the transistor switches are Circuit in center simply actuates arranged so that water entering any LEI) or alarm, while that ut bottom bilge space and bridging its probes will t urns on bilge pump LED activate the Sonalert but E WM- will light only at the some time. -- - the LED labelled for that bilge. You OR can BONALERT + duplicate the circuit for TO each bilge to be FLOAT L - ..J 12V SWITCH --+ - protected. The only thing in common among the circuits is the Sonalert. Shown in Fig. 12 is a method for marking the safety panel area where the TO LEDs are mounted. FLOAT Using the layout SWITCH MAN. shown, you know instantly which of the H AUTO + 12 -14V bilges is leaking (by its lighted LED) when the alarm sounds. The transistors can be replaced by a DIP transistor array, provided the outputs can sink enough current to drive the Sonalert. You can use a high -power alarm sounder by replacing the Sonalert with a relay whose contacts can handle the bigger alarm's current. If you use this BONALERT arrangement, be sure to install a protec- Fig. 11. In this t)¡pe of bilge ala rm. the tive diode across the relay's coil. 12 -14V electrodes are simple SCR Tachometer. steel screws sealed The circuit shown in in insulated housing. 111 Fig. 13 consists of a basic 0- to -2.4 -volt Alarm sounds until .OIyF meter system and a frequency -to -volt- Snitch is opened. age (f /v) converter. The voltmeter por- WATERPROOF CABLE tion made up of /C1 and IC2 features 20 FILL WITH SEALER )((SEE TEXT) divisions, each represented by a LED. The IC3 f/v converter accepts varying- frequency pulses from the engine's ignition points and converts them INSULATED HOUSING into proportional dc voltages with constant updating. Using a system like that shown makes possible an economical solid -state alternative to the traditional analog meter. It ySTAINL ESS STEEL is free from parallax errors and is much SCREWS DEBRIS easier to read and interpret than the SCREEN analog meter, too. At night, readability increases, and the red emission of the LEDs has little effect on night vision. The two LED drivers are cascaded by connecting mode pin 9 of IC1 to pin 1 of scale of IC1 to half the voltmeter range. sistors also program the ICs to deliver IC2. Pin 9 of 1C2 connects to pin 11 to Because 1.2 volts should be generated 10 mA produce to each LED. dot operation. Internal IC oper- across it, this resistor should have a 1°i° A charge -pump frequency -to- voltage ation requires R1 to be connected or better tolerance. Also, since 2.4 volts (f /v) converter, high -gain op- amp /com- across LED9 (pin 11 of ICI) to is obtain generated across it, R3 should be rat- parator, and an uncommitted proper operation. output Resistor R2 sets the ed at 1 °r° or better tolerance. These re- transistor are contained in IC3 (Fig. 14). 56 POPULAR ELECTRONICS

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 52 A Schmitt- trigger device is used for the +10V input. It features a built -in hysteresis to provide clean switching if noise is pres- RI R2 SONALE RT ent on the input signal. In the 14 -pin DIP 2.2K LM2917N version of the IC, an internal LEDI zener diode also maintains calibration 13 stability. CI-C_ 01 13, R6, and Cl condition 05pF In Fig. R5, 1 10 the input signal from the points. A sta- xcl 12 LM1830 ble- temperature- characteristic capacitor 1 must be used for C2, which is the timing cz .002;7 7 capacitor for the charge pump. Potenti- ometer R9 serves as the discharge path and doubles as the scale calibration control. Charge -pump filtering is provided by C3. The uncommitted emitter of is connect- TO the internal output transistor PROBE OTHER PROBES ed to R10. TIPS LED The input signal for the voltmeter is from R10's wiper. This allows the taken Fig. 12. Circuit above output of the tach section to be matched is an alarm system for to the voltmeter's full -scale range. (Al- bout with multiple bilge BILGES though this could be accomplished via spaces. Visual and R9, better linearity is possible when the audible signals are full output of the tach circuit is used and used to indicate which then reduced in level to match the re- bilge has water in it. in quirements of the voltmeter.) Biasing for LEDs are mounted as shown at the internal op amp is obtained with R7 diagram right to show each area. and D2. There are a number of ways to assemble the tach. The LEDs can be ar- column, with the ranged in a vertical LED 20 highest rpm at the top, or you can opt for LEDI 20K

PARTS LIST (Fig. 12) Al- Sonalert SC628 or similar el-0.0511F disc capacitor C2- 0.0112 -1.LF disc capacitor C3-10-11E. 6-V electrolytic

ICI -LM 1 30 (National) R2 R3 LEDI -Bright red LED I.IK 2.4K QI . Q2- 2N2222 transistor RI 2200 -ohm, I/z -W resistor R2 -To suit LED current PARTS LIST (Fig. 13) R7 RB C1, 0.02 -µF capacitor D2 IOK 47011 C2- IN914 C3 -I -(LF. 12 -V electrolytic PÓIÑTS DI -III -V zener (see text) R5 D2-11\191.4 IOK OUT IN Dot /Bar Driver (National) IC3 IC4 ICI . IC2- LM3914 LM2917N +IOV R4 14 -pin F/V Converter (Na- REG ton 1C3- LM2917N (SEE R6 GND lional) 20K 2 12 TEXT) IC4 -10 -V, 0.5 -A positive regulator red LED I through LED2O -- Bright LED CI C2 R9 co RIO .02 02 100 IpF IOK DI I1, resistor RI , R6-- 20,000 -ohm. -W pF pF K I8V R2 -I 100-ohm, 1%, 1/2-W resistor Ih R3 2400 -ohm. 1 °Ir, -W resistor R4 -10 -ohm resistor (see text) R5, R7- -10.100- ohm. -W resistor RR -470 -ohm, Iíz -W resistor pulses from ignition points to voltages R9- 100,(Ál0 -ohm, multi -turn pot Fig. 13. Circuit for converting which activate LEDs from 1 to 20 to indicate speed. R I 0L- 10,(X)0 -ohm, multi -turn pot

57 AUGUST 1979

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 53 the more familiar circular arrangement. When assembling the project, it is NC NC v+ best to slightly recess the LEDs behind a 114 113 2 9 red filter to avoid effects of washout in brightlight. Use high -luminosity LEDs in- Fig. 14. A stead of the commonly available "stand- charge -pump ard" LEDs. Finally, to assure maximum f/v converter, contrast and eliminate reflections as op -amp /comparator, much as possible, apply a coat of matte output transistor black paint on all surfaces and zener behind the diode are contained LEDs and the front panel or bezel into in LM2917N IC. which the red filter is set. Wiring is not critical. However, it is important that you observe the common 1 2 13 1-4 ground point near pin 2 of ¡Cl. 1' NC NC There is a considerable variation in the range requirements for a tachometer for inboard boat engines. Commercial 6000 analog tachs are scaled for 6000 rpm and supplied with links to adapt them to all types of engines. With the tach de- 5000 scribed here, the top end of the range 6- CYLINDER ENGINE AT can be chosen to suit the requirements 4400 RPM of any given engine. A 4 -cycle engine fires each cylinder 4000 once every two revolutions. An 8- cylinder engine running at 4000 rpm would fire 4 x 4000 or 16,000 times per min- 3000 z Fig. 15. A linear plot ute. This is equivalent to a tach input fre- similar to that shown quency of 266.67 Hz. For a 6- cylinder here can he drawn to engine operating at 4000 rpm, there are 2000 calibrate tachometer. three pulses per revolution, which is equivalent to an input frequency of 200 Hz. Note that this is a linear relationship 1000 and can be plotted as shown in Fig. 15. Following is the calibration procedure for a 6- cylinder engine with LED20 in- dicating 4400 rpm. Apply 15 volts from a bench -type power supply to the power 50 100 150 200 250 300 FREQUENCY leads of the tach. Next, connect the out- IN Hz put of a square -wave generator to the tach's input through a 0.1 -µF capacitor. +10V Using a frequency counter, set the generator for a high -level output of 220 Hz. Fig. 16 LED 191 Set R9 near maximum resistance. Using Tachometer *PLACE IN SERIES add-on WITH CHOSEN a high- impedance voltmeter, is used to RPM LED connected identify critical between pin 410- 5 of IC1 and ground, adjust cruising speed. - -- -Il - -101 -911 CI R10 for a 2.4 -volt reading. This should IOOyF PART 1 OF turn on LED20. Adjust R9 until IC2 1 LED/9 F16 13 extinguishes PARTS LIST (Fig. R3 and LED20 is at full bril- 16) - 6i J 47011 IT liance. There is some overlap built into ('I- 10011F. I2 -V electrolytic L the dot drivers so that one LED fades RI I(6) -ohm, 1/2-W resisior R3 R2 -ohm, 1 /z out as the next LED comes on. Slowly I0(R) -W resistor R3 470 -ohm, 1/2-W resistor reduce the frequency of the generator while observing both the tach display and frequency counter to check the li- ZENER nearity of the tach's scale. It will not be TO RESISTOR 4. FROM perfect, but it will be EQUIPMENT SYSTEM better than a quick (SEE TEXT) BATTERY glance at a standard analog meter. PROTECTIVE ISV DIODE The calibration procedure for an 8- ZENER cylinder engine Fig. 17. A series diode is used in will be the same as that the positive supply for reverse for the 6- cylinder engine above. The voltage protection as shown here. only difference is that you start with a generator frequency of 293.3 Hz. 58 POPULAR ELECTRONICS

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 54 If your finished tach has a tendency to flicker at low rpm, increase the value of Introducing ... C3. Do not overdo this because if the value is raised to 2 p.F, the flicker will be reduced, but at higher speeds there may The Solar Alarm be a tendency for adjacent LEDs to flicker back and forth as a low- frequency os- Chronometer cillation sets in. Of course, a rough run- lots of ning engine is going to produce Light Energized flicker, which can serve as a reminder to Electronic Quartz Accuracy have your engine tuned. The value of C3 24 hour alarm is a compromise. Once you install the tach, it is a good idea to have it checked against a good -quality tachometer. A personal alarm The circuit shown in Fig. 16 is a useful Only and time system It can be used to add -on for the tach. powered by light. identify the critical cruising rpm where $49.95 fuel economy is at its best or as an over - rpm warning. The LED in the string to it is will flash on and off and which connected a more accurate watch. latest technology in electronics You can't wear time meas- when the indicated rpm is reached. The LCD chronometer has a built engineering. The programmed Plus this new and -hour alarm and personal reminder uring features include hours, minutes, flash range is quite narrow. Bear in in 24 month and And you no longer have to worry pulsating seconds plus the may not system. the touch of a mind, therefore, that this circuit about batteries failing because this watch date displayed instantly with liquid crystal display as an attention getter with a is constantly being recharged by light. A button. The large be usable in large easy to true scientific break thru. constantly shows the time rough- running engine. The rpms would read numerals. A special night light corn - be traversing the flash point too rapidly Forget about losing time mand button illuminates the dial for night crys- for the circuit to go into action. The time base is a finely tuned quartz viewing. tal, trimmed by the manufacturer electron- Forget about being late ically to an accuracy of 5 seconds per function of this solar stands The most unique Transient Protection. Any mobile month. And the manufacturer is the alarm system. The 24 with a one year lim- chronometer electrical system, including that in a behind this accuracy hour alarm system is easy to set without a 5 year replacement ited warranty plus disturbing the time function. And it sounds boat, can suffer from voltage transients the micro -rechargeable energy warrant on with a pleasant electronic beep precisely of many kinds. Some transients are ca- cells. at the pre -set time. Your own personal pable of destroying solid -state compo- Who is the Manufacturer alarm system will automatically beep you in the digital at the right time for "on- time" punctuality, nents and systems. Hence, it pays to U.I.T. has been the innovator watch industry for years. U.I.T. is the prime so important with todays busy schedules. have adequate transient protection. manufacturer, assembler and importer of You may never be late again. There are simple ways to give a large LCD watches. U.I.T. has been the seconds watches where Test it for 2,592,000 protection to pioneers of solar powered to measure of transient energy" recharges micro -energy Take 30 full days (2,592,000 seconds) "light of this fine home -built projects. GE's MOV transient cells contained in the watch. A system so confirm the accuracy and utility If yoU doubt the quality, merely protectors is one simple way. A second efficient they are able to offer the unheard timepiece. of 5 year warranty. return it for a full refund. method is shown in Fig. 13, where 10- If you have beeh looking for that special of the ohm resistor R4 and 18 -volt zener diode Forget about batteries opportunity to own a chronometer future here is your chance! Available in the power input line. If the cir- The new solar -alarm is powered by micro - D1 protect being silver or gold tone with fashion flex band. energy cells which are constantly feature ultra -thin cuit is to take care of a blown regulator, recharged from available light. Not just All U.I.T. timepieces con- room light. You design, rugged shock proof engineering where 18 volts may be on the line solar light but ordinary construction. The never need to worry about batteries. and water resistant tinuously, the division of dissipated pow- solar -alarm watch is priced at $49.95 each resi- er between the zener diode and resistor Forget about changing technology plus $2.50 shipping & handling. (IL. of the dents add 5% sales tax). must be calculated. Once breakdown This solar -alarm watch uses all occurs, the circuit will be carrying well

over 1 ampere of current. This means CAMBRIDGE that the power (wattage) ratings of the IITERNAT1ONAL, k Dept. PE9 resistor and diode must be calculated. 8700 Waukegan Road, Morton Grove, Illinois 60053 (312) 966 -5510 Reverse voltage protection is a simple Credit card customers call operator #219 toll free in matter of installing a series diode the 800- 241 -8444 (In Ga. call 1- 800 -323 -9123) +V line, with the diode's anode connect-

ed to the + input, as shown in Fig. 17. Clip & mail to: Cambridge International, Inc. Dept. PE9 Ill. 60053 subsystem should be individually 8700 Waukegan Rd., Morton Grove, Each & handling. I understand Please send me Solar -Alarm Watches at $49.95 each plus $2.50 shipping for transients and re- 30 days for full refund. protected, both that I may return my purchase within verse voltages, to assure maximum se- CH silver tone gold tone Change to: Visa Master Charge Of course, one LJ Check or MO enclosed. curity against failure. Exp Date Account # heavy -duty zener -diode circuit can be Name for an entire instrument group to used Address condi- 7ip handle steady -state overvoltage City State 204 tions, but smaller suppressor circuits Signature ©Cambridge International, Inc. 1978 J should still be used on each board. O CIRCLE NO. 52 ON FREE INFORMATION CARD 59 AUGUST 1979

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 55 :Experimenter's Corner

By Forrest M Mims IC INTERVAL TIMERS

AN INTERVAL timer is a circuit that provides an finished output reading this column, you will probably have thought of pulse of predetermined width at periodic intervals. This several more. can be readily accomplished using any one of several timer ICs available to today's electronic experimenter. Many IC tim- Basic 555 One -Shot. Although most experimenters have ers, such as the well -known 555, are not only capable of such assembled either breadboard or permanent circuits that use a astable operation but can also function as monostable multivi- 555 timer, many do not fully understand how this IC brators or "one-shots." works. For those of you in this category, the following paragraphs will Figure 1 is a timing diagram comparing the operation of a provide a quick overview of the monostable operation of the monostable to that of an interval timer. Note that a one -shot 555. If you're already familiar with 555 basics, you timer is designed can skip to activate an external device or circuit for or ahead to the next section. after a fixed period. An interval timer, on the other hand, pro- Figure 2 is a simplified block diagram of a 555 connected as vides uniform output pulses at an adjustable interval. a monostable or one -shot timer. The key sections of the 555 You are probably already familiar with numerous applica- are the two comparators, VC1 and VC2. They sense when the tions for conventional one -shot timers. Common examples in- timing capacitor (Cl) has charged or discharged clude to a prede- automatic switches that extinguish the headlights of a termined level. car a minute or so after the ignition is turned off, delayed - To understand how the 555 works, assume the circuit in action intrusion alarms, switch debouncers, kitchen and dark- Figure 2 is "off." This means the control flip -flop is reset and room timers, etc. Q1 is on. Capacitor Cl is therefore short circuited by Q1 and Although the applications for interval timers are not as nu- cannot charge. The output of the circuit (pin 3) is low. A nega- merous, they include two that are particularly interesting: tive pulse applied to the TRIGGER input (pin 2) momentarily time -lapse photography and time -lapse sound recordings. causes the output of comparator VC2 to go high, setting the You have probably seen many examples of time -lapse pho- control flip -flop. This cuts off Q1, which allows Cl to charge tography -the opening of a flower, formation of clouds, con- exponentially at a rate determined by the values of Cl and struction of a building, etc. Time -lapse sound recordings can PI. During this period, the output at pin 3 is high. store periodic samples of data encoded as an audio tone Notice as the three series -connected 5000 -ohm resistors in well as simply capture ambient sounds. In the latter category, the 555. These resistors form a voltage divider that biases the an interesting possibility is to compress a 24 -hour history noninverting of input of comparator VC2 at one -third of the sup- the sounds at a busy street corner into a one- minute record- ply voltage and that of comparator VC1 ing. Another at two -thirds of the is entertaining your family or friends at a party by supply voltage. When the voltage across Cl reaches two - sampling brief segments of a record, radio program or conver- thirds of the supply voltage, the output of comparator VC1 sation and playing back the string of sound "snapshots." goes high and resets the control flip -flop. This turns 01 on and Of course, time -lapse photography and sound recordings shorts out Cl. The output at pin 3 returns are not to ground and re- the only applications for interval timers. Before you've mains there until the entire timing cycle is repeated. This is QPT/ONRL A/RN//AL cUTpUT R ESET /a/b04 VAR/AB/..E oNE-sNOT TiME TIMER DELFY LOW L

Fig. 1. Timing diagrams of the output waveforms generated by monostable multi - VAR /ABLE /A/ TER VALS vibrator or one-shot (top) and interval timer (bottom).

OJT ERVA . TIMER Low

11 VAR/ABLE '/On/// T/MEs

T/ME 60 POPULAR ELECTRONICS

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 56 + Vcc

r 1

Sk Fig. 2. Simplified functional diagram displays inner workings of a 555 timer IC. External components Rl and Cl control timer's period. CONTROL 3 ourPUT 5K SET FLIP -PLOP

TRINPUT /5 ER 0- 7 p/ 5K C/ T

3 shows the schematic of a working dual -555 inter- accomplished by applying a new trigger pulse at pin 2. Figure Interval times (determined by the values of 131 and This explanation should give you some insight into the op- val timer. to several minutes are achievable with the values eration of the 555 in its monostable mode. It should now be Cl) of up Note that the output pulse from the first 555 is directly obvious that you can easily select the time delay by the proper shown. into the input of the 555 monostable. The output of choice of components for R1 and Cl. If long delays (more coupled monostable is connected to a low- voltage relay coil than several minutes) are to be obtained, it's important to use the through D1. Diode D2 shorts out the powerful inductive kick a component with extremely low leakage for Cl. Otherwise, across the relay coil when current to it is interrupted, the capacitor will never be able to charge as it should and the produced the 555's output stage from damage. circuit will not function properly. thereby protecting The values of R3 and C2 determine how long the relay is each timing interval. Those specified keep the 555 Interval Timer. A 555 monostable can function only energized after exactly 5 seconds (4.98 seconds timer. A reset pulse is required to initiate a relay energized for almost as a single -delay R3 or for the breadboard circuit I built). Change the value of new delay period. An interval timer, however, can be made by C2 or both to obtain different times. connecting the output of a 555 operated as a free -running The relay contacts can be used to switch many different cir- (astable) oscillator to the TRIGGER input of a 555 monostable. cuits or devices on or off. Figure 3, for example, shows the The period of oscillation of the astable will determine the inter- normally -off contacts connected to the switch jack of a tape val time. The RC time constant of the monostable will deter- recorder. This jack is commonly found adjacent to the micro- mine the duration of the output pulse that follows each timing phone jack on many cassette recorders. It allows the recorder interval. +9

ToTAOE D/ RECORDER Sw/TCH 8 /N9/44 dncK RI -.> 10{ IoM R3 75K Dz Fig. 3. Interval timer employs 04914 multivi- one 55.5 as an astable 555 brator to trigger a second IC 555- operating as a ronostable. RAD% SHACk Relay Kl kegs external cirenit. 27S -0041 6 r-

61 AUGUST1979

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 57 +9 minutes. The XR -2240 (or XR -2340) is a specialized IC timer that incorporates a self- contained flip -flop divider chain to increase the length of the fundamental time delay by a factor of up to 255. Because the output of each flip -flop in the chain is directly accessible, many different time intervals can be selected without having to alter the values of the circuit's timing capacitor and resistor. Figure 5 is the schematic of a long- duration, programmable interval timer made from an XR -2240 connected as an astable oscillator and a 555 operated as a monostable. Timing components R1 and Cl control the oscillation rate of the XR -2240. The values shown give an adjustable interval T of up to about 100 seconds. The outputs at pins 1 through 8 allow you to select multiples of T ranging from 1 to 128. Therefore, selecting pin 8 will give you a time delay of up to 128 x 100 seconds or more than 200 minutes! The selected output of the XR -2240 is inverted by Q1 and coupled through C4 to the 555 monostable, a circuit essentially identical to the monostable in Figure 3. The timing period of the monostable is controlled by the time constant R6 C5. The Fig. 4. This circuit, which employs a 556 dual timer, XR- 2240/555 interval timer is far more versatile than the dual 555 or 556 is functionally identical to the one shown in Fig. 3. version because intervals of several hours can easily be obtained. Calibrating the circuit, however, can pose problems if you attempt to perform the operation when output pin 8 is selected. Calibration is much easier if you se- to be turned on and off remotely by means of a small switch lect output pin 1. If, for example, you want a timing such as one mounted interval of on the case of the microphone. one hour (3600 seconds), adjust R1 until the interval at pin 1 If you want to connect the relay to a tape recorder, use an is 28.13 seconds. Pin 8 will then output a pulse at 128 x 28.13 appropriate plug. You'll have to improvise when connecting seconds or every 3600 seconds. the relay contacts to other equipment or circuits. (A few words Incidentally, it's possible to select various combinations of of caution -never connect the relay to a circuit that exceeds XR -2240 outputs to achieve any time interval of from T to the maximum ratings for the relay's contacts. Also, never 255T when the chip is operated in its triggered, monostable switch ac line power with an unenclosed relay. Personally, I mode. However, this procedure does not give the desired re- prefer to play it safe with low- voltage applications only.) sults when the astable mode is used. It might be possible to obtáin the full versatility of the 556 Interval Timer. The 556 is a pair of 555 timers on a XR -2240 by operating the chip in its one -shot mode and trig- single silicon chip. The circuit in Figure 3, as you might sus- gering it externally. The XR -2240 would continue to trigger the pect, can be readily assembled with a single 556 dual timer 555 one -shot to provide the brief "on" time after each interval. rather than separate 555's. Figure 4 shows the functionally The time delay would be selected by shorting identical circuit. combinations of outputs to a common bus. The delay would be the sum of the delays of the selected outputs. Thus, XR- 2240/555 Long- Duration outputs 4T, 8T and 128T Timer. Because of leak- will give a total delay of 4 + 8 + 128 or 140T. age in the timing capacitor, the maximum period of a 555 op- I'll leave the details to those readers who like challenges. erated as an astable oscillator is usually limited to several See the XR -2240 data sheet for design tips.

+ 9v

TO TAPE R7 D/ RECORDER iok 5/ 8 Sly/ rcN kl /N /0,H 9/ AC/c Fig. 5. Long -duration, programmable interval timer /3 employs XR -2240 as an astable 555 and 555 as a monostable. Relay Kl keys external circuit. c/ .T. /O,NF c2 K/ 0.047 RAD/c, 5NACK (SEE TEXT) uF 275 - oo4

C3 c5 0. 0/ 33µF /aF

62 POPULAR ELECTRONICS

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By John McVeigh, Technical Editor

ANTENNA LENGTH CALCULATIONS MHz above the frequency you used in your calculations and further explains between my statement and Q. I am writing with reference to your the disparity result. article, "Choosing a Mobile CB An- your tenna," which appeared in the April 1978 In the was issue. article, it stated RFI that at CB frequencies, a vertical half- wave dipole would have a length of Q. I have amateur and CB radio 5.2 meters. Using the formula A = c /f, equipment as well as an audio sys- with c= 2.9971 x 108m /s (speed of tem. Whenever I'm recording an 8- -YOURS FREE. light in air) and f =27.0 MHz, I come up track or cassette tape and using one with A =11.10 meters, or a half - of my rigs, my transmissions come 32 -pages of test instruments -from the latest digital multimeters to the famous wavelength of 5.55 meters. Working through the stereo system and are re- EICO scopes. Security systems. Auto- backwards, I find the frequency cor- corded on the tape. All the compo- motive and hobbyist products. Kits and responding to a half -wavelength of nents are well grounded, and I've in- assembled. EICO quality. EICO value. For FREE catalog, check reader service 5.2 meters to be 28.818 MHz, which serted low -pass filters at the outputs card or send 50é for first class mail. isn't even close to actual CB frequen- of the transmitters. The problem still cies. Could you explain to me why I to it? 108 New South Road exists. What can do cure -Bill E/CO Hicksville, N.Y. 11801 this difference exists? I have Columa, KA4DAP, Rocky Mount, NC. searched through my technical refer- CIRCLE NO. 19 ON FREE INFORMATION CARD ences, but have been unable to come A. The space we have here is far too Put Professional Knowledge and a up with an answer. -Jim Sloot, Cal- small to permit a detailed discussion of gary, Alberta, Canada. the RFI problem, but what basically hap- COLLEGE DEGREE pens is this. At some point in the audio in your Electronics Career through A. Your calculations are correct, but the system r -f enters and is rectified (detect- length of a "half- wave" antenna is not ed), giving up the information used to exactly one half -wavelength. Rather, a amplitude modulate it. The detected au- resonant dipole has an electrical length dio is then processed by the rest of the of one half -wavelength. The length of system, which cannot distinguish be- conductor required for a resonant anten- tween it and the desired audio signals. na depends on several factors, including The key to solving an RFI problem is the ratio of its length to its diameter. The to locate the point of entry and treat it smaller the ratio (the thicker the conduc- with shielding and /or filtering. I wrote a Earn Your tor), the shorter the antenna for a given comprehensive article on the RFI prob- DEGREE electrical length. Practically speaking, lem for the May 1977 issue of our sister the diameter of the conductor accounts by correspondence, while continuing your publication Stereo Review. That article for a 2 -to -5- percent present job. No commuting to class. Study shortening. contained a methodical, step -by -step The end effect also reduces at your own pace. Learn from complete and antenna procedure for eliminating RFI, and I sug- explicit lesson materials, with additional length. That is, the strain insulators and gest you either locate that issue or order assistance from our home -study instructors. wire loops wound on the insulators (in a reprint fo the article (ask for Reprint Advance as fast as you wish, but take all the case of a dipole) contribute a small No. 21) at a cost of $1.50 from Stereo the time you need to master each topic. amount of capacitance, which lowers Reprints, Box 278, Pratt Station, The Review Grantham electronics degree pro- the resonant frequency. To compen- gram begins with basics, leads first to the Brooklyn, NY 11205. Residents of CA, sate, the antenna must A.S.E.T. degree, and then to the B.S.E.T. be shortened by CO, DC, FL, IL, MI, MO, NY, TX, or VT degree. Our free bulletin gives complete a few percent. must add applicable sales tax. P.S. -I details of the program itself, the degrees Finally, your calculations are based don't get royalties on reprint sales! awarded, the requirements for each degree, on a frequency of 27.0 MHz. Generally, and how to enroll. (We are located at 2500 an antenna will best cover a range of fre- Have a problem or question in circuitry, compo- S. LaCienega BI., Los Angeles, Calif.) Write quencies when it is tuned to the center nents, parts availability, etc? Send it to the Hobby to our mailing address shown below for Scene Editor, POPULAR ELECTRONICS, One Park frequency. For the 40- Bulletin E-79. channel Citizens Ave., New York. N.Y. 10016. Though all letters can't Band, which extends from 26.965 to be answered individually, those with wide interest Grantham College of Engineering will be published. 27.405 MHz, channel 19 at 27.185 MHz P. O. Box 35499 Los Angeles, California 90035 is the median frequency. That's 0.185 Worldwide Career Training thru Home .Study POPULAR ELECTRONICS CIRCLE NO. 27 ON FREE INFORMATION CARD

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 60 Product Test Report fact: it's easy to upgrade Compucolor II Model 4 your M95 cartridge and gain dramatic Personal Computer System freedom from distortion One of the critically acclaimed advances introduced in Shure's incomparable V15 Type IV phono cartridge is its revolutionary and unique distortion -reducing Has full graphics Hyperelliptical diamond stylus. The Hyperelliptical stylus con- and built -in floppy - tacts the groove in a "footprint" that is narrower than both the diskette drive Biradial (Elliptical) and the long - contact shapes such as the Hyperbolic. The performance features of this new tip geom- etry are now available to owners of M95ED or M95G cartridges by simply upgrading either with a Model N95HE Hyperelliptical stylus. AMONG THE few small computing 117 keys and offering extended plotting You'll find the cost extraordinarily systems that provide colorgraphics capabilities available at extra cost). low -but the difference in sound is the Compucolor II from Compucolor The keyboard /computer package will be immediately apparent. Corp. (Address: 5965 Peachtree Cor- measures 19" (48.3 cm) wide by 7" (178 The new stylus takes only sec- ners East, Norcross, GA 30071; Tel: mm) deep and slopes from 4" (102 mm) onds to install with a simple, 404-449 -5861). Several versions of this high at the rear to 2" (51 mm) at the no -tools procedure. computer are available, offering a varie- front. The monitor /disk drive package The Hyperelliptical stylus is ty of RAM, keyboards, single measures 18" wide by 15" deep by 13" optional also available in a brand new, and multiple disk drives, etc. These are high (457 x 381 x 330 mm). Price of the ultra -flat frequency response, basically two -package systems consist- Model 4 with a Standard Keyboard is high trackability cartridge: the ing of a 13" (33 cm) diagonal color moni- $1695, plus $135 when substituting the M95HE. Write for free brochure tor and disk drive in one and a key- Model 101 Extended Keyboard. (AL600). board /computer system in the other package. The two are interconnected Technical Details. The computer is via a single 30" (76.2 cm) long multicon- based on an 8080A operated with a N95H E ductor flat ribbon cable. 2 -µs cycle time. It can support up to 65K Improvement Stylus We evaluated the Model 4 version of of memory, and has on -board space for the Compucolor II, configured with 16K 32K. There is 16K of ROM in which are of user -available RAM and a single 51/4" the operating system and BASIC, and SHURE floppy -disk drive. The optional 101 -key sockets are provided for additional 8K of Shure Brothers Inc. Model 101 Extended Keyboard was ROM. The system is designed to use up 222 Hartrey Ave., Evanston, IL 60204 substituted for the Standard 72 -key key- to 480 I/O ports, 30 of which are imple- In Canada: in board. In addition to the standard 72 mented the standard computer. This A. C. Simmonds & Sons Limited keys, the Extended Keyboard has a sep- number includes an RS -232C serial port MANUFACTURERS OF arate four -function calculator -type clus- for printer or modem, with a broad selec- HIGH FIDELITY COMPONENTS, ter, and a cluster of editing keys. (There tion of baud rates. MICROPHONES, SOUND SYSTEMS AND is also an optional Deluxe keyboard with The graphics display features an 8- RELATED CIRCUITRY. CIRCLE NO. 470N FREE INFORMATION CARD AUGUST1979 67

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 61 color selection on a 10" by 7" (254 x 178 cial graphic symbols are. The basic keyboard is standard ASCII mm) usable screen area. The 128 x 128 Conventional 40 -track diskettes are four -level with 192 codes. It uses gold graphics is refreshed at power -line fre- used with an average access time of 40 crossbar keyswitches of commercial quency. Alphanumerics consist of 32 ms for 40 tracks, while average latency quality. CPU reset and automatic dis- lines of 64 characters /line for small -size is 200 ms. Data transfer rate is 76.8K kette loading keys are included. capital letters or 16 lines of 64 charac- bits per second, with a diskette storage In software, a complete disk operating ters /line with large -size caps. Lower- capacity of 51.2K bits per side (both system as well as disk BASIC are in case letters are not included, but 64 spe- sides usable). ROM. The BASIC is simlar to most other disk BASICs and has 32 statements and commands, 19 mathematical functions, THE BIG PLUS + nine string -manipulation functions, and Graphic Equalizer 12 disk -file commands. Calculations are to five decimal places. For more The operating system has 31 CON- TROL- plus -key commands, 31 ES- information Cape- plus -key codes, and 12 graphic - on plot commands. There is also a full corn - plement of CRT Terminal commands as advertised well as full- function foreground /background color selection along with 15 plot products, commands. This wide variety of com- equipment mands gives the user control over every possible function of the computer. tested, etc., Most of the keys are assigned two LOADED with Quality Features! circle functions. Switching from one function to the other is via the CAPS LOCK key. Stereo ... Eleven Bands Per Channel Extremely Low Some keys are used in conjunction with Noise & Distortion LED Peak Indicators Center Detent appropriate ( "flat ") sliders Built -in "record" Switching Line and Micro- the CONTROL and Esc keys. Those keys phone Level Inputs /Outputs Regulated Power Supply number that permit color changes are color cod- Fully Guaranteed Horizontal or Vertical Cabinets Kit or ed with their respective colors. Fully Assembled Plus Much, Much More! on A 50 -pin bus connector (located on Absolutely equals or exceeds overall performance postpaid the rear) provides all addresses, data, and features of any graphic equalizer made today! clocks, etc., to allow the Compucolor to Free be extended with any upcoming peri- AARON -GAVIN INSTRUMENTS, INC. 714 -957 -8710 17231 Corla Avenue Tustin, California 92680 Information pherals. Also located on the rear apron send Yes! I've enclosed $ ' RUSH me: Rack is a connecter for RS -232C signals. This cabinet brochure Mount assembled equalizers at $189.95, p.p.d. Card. latter port can also be used for a printer _unassembled equalizer kits at $99.95, p.p.d Horizontal (Flat) Vertical (upright) modem. is fully de- California residents include 6`iß sales tax or Each connector Visa. & Master Charge orders accepted Name scribed in the manual. Address Card No A large loose -leaf -type "Programming Exp. Bank City State Zip Date No and Reference Manual" is supplied with Dealer inquiries invited the system. This manual contains 10 CIRCLE NO.3 ON FREE INFORMATION CARD ATTENTION! Radio-Shack and Heath Kit Owners! Centronics Anadex Texas Instrument Hazeltine Centronics 779 -1 DP -8000 810 Printer 1400 Micro -Printer °aft.ditii4f; 4114 $954.00 $995.00 $1599.00 $699.00

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68 POPULAR ELECTRONICS

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 62 sections that cov2r full details for using be written into the program. ing a large variety of color games, text the BASIC language (and covers pro- We also adapted a couple of simple editor, assembler, and several money - gramming examples), print formatting, business programs to the color format, management programs. and machine -level interfaces for the disk making them much easier to read and In our opinion, the Compucolor II is an BASIC. The disk -manipulation system is interpret. Credits and debits for exam- excellent choice for a computer system spelled out in detail, as are all color and ple, are much easier to follow when they to start and stay with for home use. It is graphics techniques and the file control are color- coded. very flexible, thanks to its built -in disk system (FCS). The bottom line here is that the addi- drive, and has sufficient on -bbard mem- The Manual concludes with seven ap- tion of color to a video display does ory to handle just about any length pro- pendixes that contain in -depth discus- make working and playing with a com- grams. This is a lot of computer for the sions of the disk BASIC, file control sys- puter much more pleasant and exciting. money. -Leslie Solomon, technical tem, CRT commands, internal features Compucolor is supporting its system Director of the computer, an ASCII value table, with lots of software (diskettes), includ- CIRCLE NO 104 ON FREE INFORMATION CARD and the Compucolor alphanumeric and graphic character set, along with other documentation.

User Report. The Compucolor is a complete computer. Simply unpack the two sections, interconnect them via the flat ribbon cable, plug the line cord into an ac outlet and turn on the power. That's all there is to getting the system up and ready to go in either the operating system or BASIC. To use a diskette, simply insert the diskette in the drive, close the drive door, and press the AUTO key on the keyboard. In just a couple of seconds, the disk "menu" pops up on the screen. The graphics display was clean and The DMM you've wanted: sharp with bright colors. The overall quality of the graphics was excellent due Quality and performance to good convergence and the fact that the monitor bandwidth is better than that at a low, low cost of a conventional color-TV receiver. One A surprisingly low $69.95. Surprising And More: automatic polarity and zeroing; of the major advantages of the color because you get the type of performance overrange indication; overload protection on all monitor is that opitically disturbing moire you've wanted but expected to pay much ranges. patterns (from nearby TV transmitters more for. This compact unit is powered by 4 "C" cells (not included) so that you can take your lab - on adjacent channels or local or mobile Quality, Performance and quality henchtop unit anywhere with you. hams and CBers) are not seen on- Accuracy screen. Also, this approach provides an The 2010A offers you long -tern accuracy Kit or FactoryAssembled with a laser -trimmed resistor network, a stable Either is a tremendous value. Complete kit apparent increase in bandwidth since bandgap reference element, and single-chip LSI only $69.95; assemble it yourself with our easy - the monitor is not bandwidth -limited by circuitry. With 31 ranges and 6 functions, you to- follow instructions. Or, for only $99.50, r -f or sound circuits. The Compucolor can measure AC or DC volts from 100 µV to Sabtronics will ship your 2010A factory- "Sampler" program on diskette demon- 1000V; AC and DC current from 0.1 p.A all assembled and calibrated. strates the system's graphics capability. the way to 10 A; resistance from 0.1 SZ to 20 Whether you're a professional or a hobbyist MS/ Typical DCV and Ohms accuracy is 0.1% (or both!): When quality, accuracy, and price The keyboard was a dream to oper- ± 1 digit. Easy -to -read 31/2 digit LED's with 9mm count, you should check out the 2010A DMM ate. It has a positive professional "feel" numerals and automatic decimal point. for yourself. Order one today for a full 10 days and operated flawlessly. Extra features for greater to inspect it; if you're not completely satisfied, Having had experience with other convenience and flexibility merely return it in its original condition for a prompt and courteous refund of purchase price. BASICs, we found Compucolor's ver- Unique X10 multiplier switch gives you Call with your Master Charge or Visa sion easy to use. It is a fast BASIC and convenient selection of the next higher decade. number or write the address below. is broad enough to easily adapt to pro- Hi -Low Power Ohms capability gives you three 2010A Kit: $69.95 (plus $4.00 S&H) grams written in other BASICs, high -ohm ranges that supply enough voltage to except ( turn on a semiconductor junction. You use the 2010A Assembled: $99.50 plus $4.00 where unique symbols are used. three low -ohm ranges for in- circuit resistance S&H) After working some of the program- measurements. AC-115 Adaptor: $7.50 NB-120 Nickel Batteries: $17.00 ming examples given in the Manual, we Wide Frequency Response: Hz to kHz Cadmium 40 40 THP20 Touch and Hold Probe: $18.00 typed in several game programs incor- bandwidth lets you measure audio through AC signals. porating color graphics. This is quite ultrasonic Making Performance Affordable Touch -and -Hold Capability (with optional easy to do, as a single keystroke can be probe) lets you hold readings as long as you used to change colors, flash symbols, wish so you can make measurements in hard - sabtronics INTERNATIONAL INC invert and do other formerly difficult to -reach places without taking your eyes off 13426 Floyd Circle M/S 24 Dallas, Texas 75243 graphics "tricks." These keystrokes can the probe tip. Telephone 214/783 -0994

AUGUST 1979 69

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 63 /J/ILI\\\11\\\ DX WAIP1 Listening

By Glenn Hauser WARC -79

THIS FALL, the World Administrative Radio Conference expansion totals 1290 kilohertz, as follows: (WARC) in Geneva will reallocate the radio entire spec- Proposed (kHz) Present (kHz) trum, in keeping with anticipated needs through the end of the 5900 -6200 5950 -6200 century. Of prime concern to DX listeners is the proposed 7250 -7500 7100 -7300 (not Region 1) reallocation of the shortwave spectrum to allow more space 9375 -9825 9500 -9775 for broadcasting. 11550-12000 11700-11975 Fixed (point -to- point) communication has largely switched 13600 -13850 none to satellites in the past 15 years. This trend will no doubt con- 15100 -15700 15100 -15450 tinue. At the same time, the relatively small shortwave broad- 17600 -17900 17700 -17900 cast bands have become overloaded to about three times 19750 -19990 none their capacity. This is why co- and adjacent -channel interfer- 21450 -21800 21450 -21750 ence has become the rule rather than the exception. It would 25850 -26100 25600 -26100 appear, then, that the natural solution would be to turn over a portion of the fixed bands to broadcasting. But it's not that The US position calls for selective sharing between fixed simple. There are many other claimants to the hf spectrum services and broadcasting in all added band space. However, (such as Amateur Radio), and different countries have differ- it is not considered likely such sharing will be adopted by the ent priorities. Conference this fall. For the past few years, the FCC has sponsored a series of The US position also urges, but does not give a specific meetings by the International Broadcasting Service Group, to date for, adoption of single sideband for international broad- help it determine exactly what should be the US position at casting. But this change is not likely in the near future. Also WARC. In April, the IBSG issued its final proposal and dis- being considered are power limits of 50 kW for domestic oper- banded, its mission completed. ations and either 250 or 500 kW for international operations. The world is divided into three broad regions for allocation While this may seem excessive, it is realistic. There are al- purposes. Region 1 includes Europe, Africa, the Mideast, and ready some instances of a full 1000 kW and even 1250 kW the USSR. Region 2 consists of North and South America. being used in some situations. Region 3 is comprised of the rest of the world, which includes Our thanks to Lawrence E. Magne, member of the IBSG, for Asia and the Pacific. supplying this information. The IBSG proposes that international broadcasting between 5.8 and 22 MHz should be expanded by 93% in Region Moscow via Cuba. The USSR has long been the target of 2, and 80% elsewhere, very nearly a doubling of available in- American broadcasts from such nearby countries as Greece, band space, from the present total of 2350 kilohertz to Germany, and Britain. Now, more than 20 years after the tri- 3940 kilohertz. umph of the socialist revolution in Cuba, Radio Moscow has Since Third World countries hold the balance of power at begun transmitting in English to North America via Cuba. WARC, the US position also proposes a 60% expansion of We first noted the foregoing arrangement on April 22, Le- bands for tropical broadcasting by adding five new tropical nin's 109th birthday, as the "newscasts" reminded us every bands in the 3 -to -14 -MHz range and making all tropical half hour. bands, new and old, exclusively for tropical instead of interna- The Moscow signals were and are the strongest on the tional broadcasting. No changes are proposed between 3.0 bands during the daytime. This, combined with their steady and 5.8 MHz, either in tropical or international bands. The five strength even during ionospheric disturbances that block di- proposed new tropical bands, totalling an addition of 300 kHz rect reception from the USSR, made it obvious that a relay are: 5850 to 5900 kHz, 7500 to 7550 kHz, 9825 to 9875 kHz, was in use. Radio Moscow characteristically made no public 11,500 to 11,550 kHz, and 13,900 to 14,000 kHz. These are announcement of the new relay, nor has it ever been publicly adjacent, or almost adjacent, to existing or newly proposed in- admitted that some of its other broadcasts to North America ternational broadcasting bands, for the convenience of listen- are relayed via Bulgaria. ers, receiver designers, and existing transmitting equipment. Why wasn't the Cuban connection made use of long ago? In the proposed new international broadcasting band allo- Cuba has been making full use of its shortwave facilities, but cations, all existing bands (except 25 MHz) are expanded, there has always been a shortage of power and spare parts, and two totally new bands are added. These new bands and there has been no reliable way of feeding the Moscow au- would further relieve congestion on adjacent bands and make dio to Cuba. Now, however, Cuba has a satellite link with better use of prevailing maximum useable frequencies. This Moscow and finds it advantageous to dedicate one of its 70 POPULAR ELECTRONICS

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 64 transmitters to Soviet broadcasts to North America. In return, programmes planned this month are these (dates and times a Soviet transmitter is dedicated to Cuba's broadcasts to the GMT): "Play of the Week," August 5 at 0030 and 1130 pre- Mediterranean area. sents the winning entry in the World Service Drama Competi- Radio Moscow thus becomes the international broadcaster tion. On Their Majesties Most Secret Service," four programs with the most hours per day beamed to North America, sur- on the history of British espionage, Saturdays at 1130, Tues- passing the BBC by far. And with this Cuban relay on one days at 2030, Wednesdays at 0230. "The Art of the Whodun- good frequency at a time, we may hope that Radio Moscow nit," on the history of detective fiction, Saturdays at 0815 and will no longer find it necessary to use a dozen different fre- 1315, Sundays at 2015, Mondays at 0315. "Venice Pre- quencies on direct broadcasts from the USSR. served," week of August 20, Monday at 0945 and 2130, Thursday at 1430. Week of August 27 at same times, "Pom- Publications. For a list of club publications and services, peii." Week of August 26, Sunday at 1830, Monday at 0100, send a legal -size SASE with 280 postage to ANARC, 557 N. Tuesday at 1345, "A Thurber Carnival." "Behind Every Great

Madison Ave., Pasadena, CA 91101. Man . . .," Saturdays at 0430, Mondays at 0815 and 2315. FRENDX, the shortwave broadcast journal, provides a (Subject to change). great deal of timely schedule, logging, and QSL information plus receiver reviews and nontechnical articles. Sample $1, Updating Listings. The following changes and additions subscription $13, from NASWA, Box 13, Liberty, should be made in the "English Broadcasts" listings that ap- IN 47353. peared in the June issue: Review of International Broadcasting, a monthly listeners' magazine emphasizing free discussion of programming and issues affecting the DX listening hobby (an approach lacking GMT Station Frequencies, changes in other publications) is $1 a sample or $12 a year from Glenn 1000 -1030 R. Korea 11725, 9580 Hauser, Radio WUOT, Knoxville, TN 37916. 1000 -1300 R. Moscow 9600 (via Cuba) The World in My Ears, is a new book by well -known New 1000 -1602 ABC, Perth 9610 Zealand DX listener Arthur Cushen, who, despite blindness, 1030 -1300 CBC Northern has been very successful in shortwave, to the point of being Service 9625, 6065 not 11720 knighted. For information, contact Cushen direct, at 212 Earn 1100 -1115 R. Pakistan 21655, 17662 St., Invercargill, New Zealand. 1100-1330 BBC add 21660; 11775 at 1100- 1130 & 1300 -1330 only August BBC World Service. Among the many fine BBC 1100 -1500 R. Moscow delete

Build The World's Most °Pti Powerful 8 -Bit Computer l_ Featuring The Famous Intel 8085! Cs Explorer/85' 147 Starting for just $129.95 you can now build yourself a sophisticated, state -of -the -art As featured in computer that can be expanded to a level POPULAR ELECTRONICS suitable for industrial, business and EXPLORER /85 shown with Video Monitor and Keyboard /Video Terminal commercial use. You learn as you go... in CHOICE OF HEX KEYPAD OR TERMINAL INPUT small, easy -to- understand, inexpensive levels! II you plan to customize EXPLORER for dedicated use we recommend that you order hex keypad input But it you are planning to go whole hog and blow EXPLORER up Features Intel8085 cpu /100% compatible with into a full size. slatei of -lne-art system with 8K or extended basic (coming soon). up oi to 64K of memory floppy disks. telephone interface. printers. and all sorts of 5.100 te 8080A software! plug -ins -you'll be better oft wdh the Keyboard /Video Terminal input The $149 95 lull with 128 ASCII John Simonton's time - proven Onboard S -100 bus (up to 6 slots)! EXPLORER Keyboard /Video Terminal includes ASCII decoding upper /lower case set. 96 prmlable characters. onboard regulators and selectable design provides two envelope Onboard RAM and ROM expansion! display formats -32x16 Io, tv sal or 64x16 for video monitor (not included) Built -in deluxe 2K Monitor /Operating ROM! EXPAND EXPLORER, LEVEL -BY -LEVEL Level "B ", at $49 95, adds S -100 signals onboard RAM /ROM decoding. generators VCA, VCO & VCF in -1/2 8 plus Cassette/RS 232 or 20 maJ4 -bit parallel Includes all parts necessary to generale the signals for S-100 bus accessories. Just I/O and timer all on beginner's Level "A" system! add two S -100 bus connectors and you have a complete 5-100 compatible computer a low cost, easy to use package. with a world of add-ons al yoar fingertips Choose from hundreds of products to EXPLORER /85 giv es yyou -bigq computer"p features immediately,y, without turningg you satisfy your individual needs Level "8" kit also includes the address decoders for Use alone with its built-in ribbon into an appliance operator, doomed to run pre-developed software Ion life simply onboard RAM and ROM expansion, which are addressable anywhere in the 65K field. monitor 8 volt power supply and or modify to use with guitar, connect EXPLORER to a terminal, video or lv set and Level "C" expansion, at $39 95, expands the S -100 bus to allow a total of six controller start running programs, the very first night! Level 'A teaches you machine S-100 cards to be plugged into EXPLORER s motherboard and contained in electronic piano, polytonic keyboards, etc. language and computer fundamentals. it lets you run exercise programs including EXPLORER's steel cabinet Includes all hardware. mounting brackets, board guides. programs to examine the cpu registers, examine memory fill memory, move memory etc Just add the number of Si 100 bus connectors you need. The perfect introduction to electronic and make up games you can load and play back these programs on an ordinary tape Level "s" expansion, at $69 95. gives you 4K of onboard static RAM utilizing cassette-and display your efforts on any tv screen video monitor or printer 1$8.95 2114 ICs Your board will also accept four 2716 EPROM's. which can be purchased of all, the Gnome is only required of the Intel 8085 music and best RF modulator for tv use I The simplified architecture separately You now have an advanced mainframe that can be customized with the makes tar to understand than computers using the older. more peripherals $59.95 in easy to assemble kit form. Is it EXPLORER easier 01 your choice to fit any (or all) specific requirements Each level of complex but less powerful 8080A. Then, when you re ready. EXPLORER can be EXPLORER is separately regulated for the ultimate in stability. Factory service is any wonder why we've sold thousands? expanded-by you -to rival the power of any 8 -bit computer on earth Or you can available from Netronics Order vow EXPLORER today! customize it to perform a dedicated task, thanks to onboard - - - - ORDER FROM THIS COUPON TODAY! - -- - RAM ROM , prototyping. and expansion capabilities r - - Kit Netrenics R&D Ltd., Dept PF e , 333 Litchfield Road, New Milford, CT 06676 rl I Send GNOME MICRO- SYNTHESIZER /85, IS59.95 plus S2.00 postage) EXPLORER's Level "A- system features an advanced Intel D Level 'A" EXPLORER /85 kit (specify D ter- D Deluxe Steel Cabinet for EXPLORER 8085 cpu, which is 50.4 taster than its 8080A prede- I minal or hex keypad input). 5129 95 plus $39 95 plus $3 p8h I GNOME MICRO -SYNTHESIZER Assembled) $100.00 plus S2 postage cessor. yet 100% compatible with 8080A software $3 p8h. D Deluxe Steel Cabinet for Keyboard /Video Ter- (Fully which. you'll discover. exists by the ton "Big computer D Power Supply kit. 5 amp. m 8 voll. $34 95 minal, $19.95 plus $2 50 p8h.

( features include an 8355 ROM with 2K deluxe monitor/ RF Modulator kit. $8 95 ppd. I Send FREE CATALOG plus 52 p8h D operating system which has two programmable 8-bit I 0 Intel 8085 Users Manual, $7 50 ppd D Total Enclosed (Conn res add tax) bi-directional parallel I/O ports, built-in cassette interlace name: D ASCII Keyboard /Video Terminal kit. $149 95 with lape control circuitry to allow labeling cassette tiles D VISA D Muter Charge Exp. Date plus $3 p8h and commands which include. - display contents of Account address: D Hex Keypad kit for hex verston. $69.95 plus memory," "run at user location (go co).'' insert data." I $2 "move contents of memory." "examine registers individ- p8h PHONE ORDERS CALL (203) 354-9375 Level "8" 100 /Onboard RAM /ROM city: state: zip: ually or all," fill command (lo fill the contents of memory 5- Decoder Print with any variable). automatic baud rate selection, program- kit (less 5-100 connectors). $49 95 plus $2 Name mable characters per line display output format. and more! pith BAC, VISA_ MC card no. An 8155 RAM -I /0 chip contains 256 bytes of RAM, two D Level "C" S -100 5-Card Expander kit (less Address DEPT.8 P programmable 8-bit bidirectional and one programmable connectors). $39 95 plus $2 p8h 6 -bit bidirectional I/O ports plus programmable 14 -bit S -100 Bus Connectors (gold), 85 each. City OK 73116 $4 L 1020 W WILSHIRE,OKLANOMA CITY. /timer, interrupt reset binary counter user and switches. D Level D" 4K Onboard RAM kit. $69 95 plus J State Zip Onboard expansion provisions exist for up 10 six S -100 $z p8n_ CIRCLE NO. 43 ON FREE INFORMATION CARD boards. 4K of RAM and 8K of ROM, PROM or EPROM. DEALER INQUIRIES INVITED _ _J CIRCLE NO. 400N FREE INFORMATION CARD

AUGUST 1979 71

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 65 1200 -1255 R. Peking 9820, not 11685 2305 -2320 Austrian R. 12015, 9770, 5945 (Sun.), 1215 -1230 V. of Greece 17785, not 17830 and 15345 not 0300 -0315 1220 -1250 R. Ulan Bator 9575 not 6383 2330 -2400 R. Finland 11800 not 11735 1230 -1255 Austrian R. 17860, not 21530 0000 -0030 R. Can. Int. 5960 1230 -1300 R. Sweden 21690, 21615, not 21700 0000 -0100 VOA not 25990 1300 -2300 CBC Northern 0000 -0100 R. Sofia 15330 Service 11720, 9625, not from 1030 0000 -0500 FEBC, 1330 -2200 R. Moscow 11840 (via Cuba) Philippines 17810 1400 -1430 R. Norway 21730, not 15175 0015 -0100 BRT, Belgium 11715, not 6080 1400 -1600 AFRTS 15430, not 15425 0030 -0100 R. Sweden 15290, not 11905 1430 -1500 R. Finland 17785, not 21475 0030 -0100 R. Kiev 15525, 11735, 9800 1500 -1600 V. of Rev. 0100 -0120 RAI, Italy 11800, not 11810 Ethiopia 9560, not 9615 0100 -0130 R. Can. Inf. 17820, not 11940 1500 -1700 R. Moscow delete 0100 -0145 R. Berlin 1515 -1530 V. of Greece not 15345 International 11970 not 11805 1530 -1600 R. Yugoslavia add 15295 0100 -0430 AFRTS 17765, not 25620 1530 -1630 V. of Vietnam 15012, 14990, not 12035 and 0100 -0500 WYFR 9715, not 5985 9840 0130 -0155 Austrian R. 5945, not 6155 1600 -1615 R. Pakistan 21755, 21545, not 21735 and 0130 -0200 R. Budapest 17710, 15225 (Wed & Fri) 21595 0130 -0230 R. Japan 15270, not 15195 1600 -1630 R. Korea add 11830, not 9780, 9640, 0200 -0230 R. Can. Int. 11940, not 9535 7150 0200 -0230 R. Norway add 11870 1600 -1800 VOA add 25880 0200 -0230 R. Budapest add 17710, 15225, not 15220 1610 -1655 BRT Belgium 21475 and 17745, not 17740 0200 -0300 R. Moscow add 12030, 9600 1700 -1800 HCJB, 0200 -0300 R. Bras 15290, not 15280 Ecuador 17765, not 17890 0215 -0230 V. of Greece 9655, not 9760 1700 -2300 WYFR 17845 0230 -0300 R. Lebanon 15285, not 15440 1800 -1830 R. Korea 15255, 11830, not 9780 or 0230 -0300 R. Korea 15350 9720 0230 -0300 R. Sweden 15290, not 9695 1800 -1900 V. of Nigeria 15185, 15120 not 11770, 0230 -0315 R. Berlin not to 1930 International 11970, not 11805 1800 -0815 R. New Zealand 17860 0300 -0330 R. Can. Int. 11940, not 9605 1830 -1900 R. Nationale, 0300 -0330 R. Budapest add 17710, 15225, not 15220 Guinea 15310 (varies) Mon & Fri only 0300 -0330 R. Kiev 11830,11735,9800 1900 -1915 R. Japan 15270, not 15105 0300 -0400 UBC Uganda delete 1900 -1930 R. Can. Int. not 11905 0300 -0400 R. Moscow add 12030, 9600 1900 -2000 HCJB, 0300 -0700 VOA add 17865 Ecuador not to 2030 0330 -0355 Austrian R. 5945, not 6155 2000 -2015 R. Japan 15270, not 15105 0330 -0450 R. Habana not 11725 2000 -2030 R. Korea delete 0400 -0415 R. Budapest add 17710, 15225, not 15220 2000 -2030 V. of Islamic 0400 -0430 R. Budapest 17710, 15225, etc, (Mon. only) Rev., Iran 9139, not 9022 0400 -0430 R. Can. Int. add 11845 2000 -2030 R. Can. Int. 15325, not 17875 or 11855 0400 -0445 FEBA, 2100 -2115 R. Japan 15270, not 15105 Seychelles 11805 2100 -2200 V. of Nigeria 15185,15120 0430 -0455 Austrian R. 15260, not 5945 2100 -2300 CBC Radio 17820, 15325 (Mon -Fri), not 0430 -0500 R. Sofia 11750, not 11860 17875, not 2200 -2300 0430 -0500 R. Korea 15345, 9755 2115 -0815 R. New 0430 -0700 AFRTS 9755, not 15330, 9685 Zealand delete 0455 -0630 V. of Nigeria 15185, 15120, 7275 or 7255, 2130 -2200 R. Can. Int. 17780 and 11940, not 17875, not 0555 -0835 17820, 15325, 11945 0500 -0515 R. Japan 15270, not 15105 2130 -2200 HCJB, 0530 -0550 V. of Germany 11905, not 6100 Ecuador 21480, 17790, 15295 0600 -0615 R. Japan 15270, not 151 0 5 2130 -2200 R. Sofia 15135, 11750, not 11920, 0615 -0630) R. Canada 11960 and 9635, not 11845, 11860 0645 -0700) International 11775, 9590, 6045 2200 -2400 AFRTS 17765, not 25620 0630 -0700 R. Korea delete 2300 -2330 BBC not 5975 0700 -0715 R. Japan 15270, not 15105 2300 -2330 R. Sweden 15290, 11705, not 15205, 0755 -fade Action Radio, 9695, 9690 Guyana 5950 2300 -2330 R. Vilnius 15525,11735 0800 -1000 FEBC, 2300 -2330 R. Korea 17860, 15385, 15345 Philippines 11765 2300 -2400 FEBC, Note: Frequencies not referred to in a given entry are still cor- Philippines 15450 rect at presstime. This is a listing of changes only, not giving 2300 -2400 VOA not 25990 complete frequency list for any particular transmission.

72 POPULAR ELECTRONICS

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 66 crotech, Box 368, Southhampton, PA 18966 assembly or diagnostic messages, and (Tel: 215 -757- 0284). PHASE /DEPHASE to allow code to reside in one area of memory but operate in another. It Jolt Stuff. ERAC (Editor and Resident accepts both 8080 and Z80 opcodes. Price is Assembler Controller) was designed for us- $200. Microsoft, 10800 NE Eighth, Suite 819, ers of ROM version of the Jolt resident as- Bellvue, WA 98004 (Tel: 206- 455- 8080). sembler ($C900- CFFF). ERAC allows source text and object code to be placed anywhere TRS -80 Solar Package. The SUN - in RAM. Residing in 2K starting at $0800, GRAPH program calculates and plots the 1000 or A800, ERAC is an extension of the sun's local elevation and azimuth for any lo- Soft ware RAP. A paper tape is available for $5, manual cation on the Earth. It uses TRS -80 Level -II $4.50, and source of $0800 version is $12.50. LEDIP (Line Editor Program) is a Sources 1.1K line- oriented text editor that can be ex- By Leslie Solomon panded. It will output source text suitable for Technical Director usage with the PROM Jolt Resident assembler ($E800- EFFF). Paper tape is $2.75. 6502 Operating System. EXOS (Ex- manual $3.25, cross assembly $5. For further tended Operating System) for 6502 comput- information, send $1 to the 6502 Program Ex- ers comes in a 4K 2708 PROM and has 20 change, 2920 Moana, Reno, NV 89509. commands including display, enter, math, memory test, find, fill, move, compare, speed change, load /dump a hex formatted MUST 8080 /Z80 Macro Assembler. This tape, verify, and several "go to" commands. 14K assembler includes a linking loader, li- The program is compatible with all MOS brary manager and cross -reference facility Technology TIM systems, or other 6502 com- and assembles over 1000 lines per minute. It puters. Price is $150. Also available is DATE supports the Intel standard macro facility and BASIC, and requires 13K storage. Options in- (Disassembler- Assembler Trace Editor). the number of nesting macros is limited only clude graphs of elevation vs time of day, azi- Source programs can be entered, assem- by memory. Code is assembled in relocate - muth vs time of day, maximum elevation vs bled, edited, traced and disassembled. The ble modules. Conditionals may be nested to date and elevation at a specified azimuth and trace mode executes the user program one 255 levels. Other features include comment date. Save options allow the graph to be instruction at a time, displays MPU registers, blocks, variable input radix from base -2 to stored on cassette. Cassette is $49, disk is the instruction and the MOST mnemonics. base -16, titles and subtitles, variable page $75. Solartek, Box 298, Guilderland, NY, $150. Both programs $295. CGRS Mi- size, octal or hex listings, PRINTX for printing 12084.

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www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 67 IW MS MINI MUM o 1 I t,t,i 1 I I I I I I I I it, I I 1 1 I

By Leslie Solomon MAIL THIS COUPON Technical Director AND WE'LL SEND WINDOWS IN THE CRT YOU THE BEST SPEAKER CATALOG THE MOST common way to corn- character as a blinking or nonblinking YOU EVER READ! . municate with a computer today is cursor. The window package is con- via a plug -in or a separate video termi- tained in an EPROM and has 20 user - No kidding. Speakerlab's catalog took longer to write than some of our competitors have nal. The ordinary video terminal forms a callable functions. You can, for example, in been business. In fact, we created an industry single "window," in which all you can run a BASIC program and display each by "building great kits so you can afford great speakers." Our catalog is an invaluable see is one piece of data at a time as it subroutine in its own window. Or you manual of speaker function appears in sequential order on the can display different data in different and design. And, it will i spaerki totadfinest screen. Recently, we had the opportuni- windows. You can even move the win- s esker kits made ty to work with a very special graphics dows around at will. anywhere...with the strongest money -back display system called the "Screensplit- If you are doing assembly -language guarantee. Find out for ter" from Micro Diversions, Inc. (8455 -D programming, one window can be used yourself...FREE. FREE, that is. Mail the coupon now. Tyco Rd., Vienna, VA 22180 Tel: as a real -time clock, another to display 703 -827 -0888). This novel plug -in video run time, and others to display register module is not limited to a single window contents or anything else you desire. l ob (see photo). Rather, the user can create, Debugging information can be con- 4eokeiept. 8-PE. 735 N. Northlake Way under software control, almost any num- tained in its own window. For game play- Seattle, WA 98103 ber of data -display windows, each with ing, you can create as many windows as its own independent display. required. Too, some windows can be SEE YOUR DEALER TODAY Individual windows in the Screensplit- dedicated strictly to graphics. THE DEMAND ORIGINAL ter can be sized, labelled, and framed as The Screensplitter does not preclude desired. Furthermore, frame and win- operation as a single window with 40 `Firestik' dow can be made to flash, display in re- lines of 80 characters each. Bear in "THE FUEL -SEEKER" verse video, clear, scroll, and use any mind, however, that this dense a display THE #1 WIRE-WOUND AND MOST COPIED ANTENNA IN THE WORLD! Rugged, Shatterproof Fiberglass ... e,,, ,1 i,.r ri,, trr,n i Antennas and accesories for manne. RV. Tiret History- cs presents -Last Reboot, -.__Time truck, auto. van and motorcycles etc I 1 JUN 78 /155375431 CB Mon: Lei kiIPLITTER Four Colors Silver -Gray. Black. Red, and White _ l Our 17th Year Serving the CB & Communications Market Lisps -Network Messages- - SEND FOR FREE CATALOG 1 Basics II ITU a SU -AI 14104 ® IGJS a MIT 15:19 I /Os PC: C35A r: VF-o1 Reminders Disk 12130 Sprinklers on Diskette: CT -1

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www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 68 ELF II by Netronics Write and run programs -the requires a video monitor with at least a 10 -MHz bandwidth. very first night -even if ru'vle The Screensplitter occupies a single never used a computer before! S -100 bus slot. It contains its own 4K of You're up and running with video graphics for just $99.95 - RAM that is memory mapped into the then use low cost add -ons to create your own personal system that rivals home computers sold for 5 -times ELF II's low price! address space so that it can be ac- Featuring pre-recorded tape cassettes. cessed if you wish to use the window ReA 1802 ELF II Gives You The Power To Make Things Happen! COSMAC CPU Expanded, ELF II can give you more power to make things happen in the real a just price that package. Own powerful borne computer system, starting for $99.95-a world than heavily advertised home computers that sell for a lot more money. pets you up and running the very first night... with your own TV for a video Thanks to an ongoing committment to develop the RCA 1002 for home computer display. $99.95 ELF II includes RCA 1802 8-bit microprocessor addressable to 64k use, the ELF II products -being introduced by Netronics -keep you right on the lull keyboard, Pascal Microengine. This new com- bytes with OMA, interrupt, 16 registers, ALU. 256 byte RAM, hex outer fringe of today's small computer technology. It's a perfect computer for two digit hex output display, stable crystal clock for timing purposes, RCA 1161 engineering, business, industrial, scientific and personal applications. puter contains 64K of RAM, two video IC to display your programs on any video monitor or TV screen and 5-slot Plug in the GIANT BOARD to record and play back programs, edit and plug-in expansion bus /less connectors) to expend ELF II into a giant! RS -232C ports, ports, debug programs, communicate with remote devices and make things happen in two parallel and a ELF II Explodes Into A Giant! the outside world. Add Kluge Iprotatypingl Board and you can use ELF II to floppy -disk controller with DMA. It fea- Master ELF It's $99.95 capabilities, then expand with GIANT BOARD solve special problems such as operaling a complex alarm system or controlling KLUGE BOARD...Ik RAM BOARDS...TINY BASIC...ASCII KEYBOARD... a printing press. Add Ik RAM Boards to write longer programs, store more tures self -test diagnostics, Pascal com- LIGHT PEN... ELF -BUG MONITOR... COLOR GRAPHICS N MUSIC SYSTEM... information and solve more sophisticated problems. piler, BASIC compiler, file TEXT EDITOR ASSEMBLER DISASSEMBLER... VIDEO DISPLAY BOARD ELF II add-ons already include the ELF II Light Pen and the amazing ELF-BUG manager, and - Monitor -two extremely recent breakthroughs that have not yet been duplicated screen -oriented editor, debugger, and More Breakthroughs Coming Soon! by any other manufacturer. Soon to be introduced: ELF II special application kits that give you the hard- The ELF -BUG Monitor lets you debug programs with lightening speed because graphics package. Available options in- ware and software you need to use ELF II for specialized purposes such as a the key to debugging is to know what's inside the registers of the microprocessor. And, with the ELF -BUG Monitor, instead of single stepping through your clude a floppy -disk subsystem, printer, telephone dialer ...industrial controller... home photography...security system ... police alert... motor controller... station output monitor on a conveyor programs, you can now display the entire contents of the registers on your TV and terminal. Cost at this writing is belt assembly line... and some new, super-fantastic games! screen. You find out immediately what's going on and can make any necessary Also coming soon: PROM Programmer.. A -D, D-A Converter ..Controller changes. $1995. Address: Computer Interface Board... and more! Unlike some heavily advertised hobby computers, ELF II The incredible ELF II Light Pen lets you write or draw anything you want on a Technology, 2080 doesn't limit you to pre- recorded programs. With ELF II you learn computing TV screen with just a wave of the "magic wand" Netronics has also introduced South Grand, Grand from the ground up... from machine language to assembly language to BASIC the ELF II Color Graphics b Music System -more breakthroughs that ELF II Center, Santa Ana, CA (Tel: ...in quick, clear and easy steps. ELF II is a powerful computing tool, but one owners wee the first to enjoy! that you can master with the same ease you once mastered a slide rule or ELF II Tiny BASIC 714- 979 -9920). pocket calculator Ultimately, ELF II understands only machine language-the fundamental coding Master This Computer In A Flash! required by all computers. But, to simplify your rel. ,ship with ELF II, we've Regardless of how minimal your computer background is now, you can learn introduced an ELF II Tiny BASIC that makes communicating with ELF II a Pet S -100 Interface. The Betsi Inter- to program an ELF II in almost no time at all Our Short Course On Micropro- breeze. cessor b Computer Programming- written in non-technical language- guides you Tiny BASIC saves you the time of having to code your individual instructions in face /Motherboard contains all logic re- through each of the RCA COSMAC 1802's capabilities, so you'll understand machine language for ELF II. Instead, you simply type instructions on a keyboard quired for interfacing S -100 boards to everything ELF II can do... and how to get Elf It to do iU Don't worry if you've -PRINT, RUN, LOAD, ETC. Your Tiny BASIC program automatically translates been stumped by computer books before. The Short Course represents a major them into machine language for ELF II. Then it translates ELF It's output back the Pet microcomputer. It connects di- advance in literary clarity in the computer field. You don't have to be a computer into simple words and symbols for you. rectly to the Pet's expansion engineer in order to understand it. Keyed to ELF II, it's loaded with "hands on'" Now Available! Text Editor, Assembler, connector illustrations. When you're finished with the Short Course, neither ELF II nor the Disassembler And A New Video Display Board! and has four S -100 slots. It does not in- RCA 1802 will hold any mysteries for you. The Text Editor gives you word processing ability and the ability to edit In fact, not only will you now be able to use a personal computer creatively, programs or text while it is displayed on your video monitor. Lines and charac- you'll also be able to read magazines such as INTERFACE POPU- terfere with the Pet's parallel or IEEE BYTE... AGE... ters may be quickly inserted, deleted er changed. Add a printer and ELF II can LAR ELECTRONICS and PERSONAL fully ports. The board also contains a dynam- COMPUTING and understand the type letters for you -error free -plus print names and addresses from your articles. And, you'll understand how to expand ELF II to give you the exact mailing list! ic memory controller that permits use of capabilities you need! ELF Ifs Assembler translates assembly language programs into hexidecimel If you work with large computers, ELF II and the Short Course will help you machine code for ELF II use. The Assembler features mnemonic abbreviations a 32K RAM board. There are also sock- understand what they're doing. rather than numerics so that the instructions on your programs are easier to ets and decoding circuitry for 8K of 2716 Get Started For Just $99.95, Complete! read -this is a big help in catching errors. $99.95 ELF II includes all the hardware and software you need to start writing ELF It's Disassemble( takes machine code programs and produces assembly PROM. Price is $119.00 for the kit, and running programs at home, displaying video graphics on your TV screen and language source listings. This helps you understand the programs you are designing circuits using a microprocessor -the very first night -even if you've working with... and improve them when required. which includes one S -100 connector, or never used a computer before. The new ELF II Video Display Board lets you generate a sharp, professional $165.00 assembled and with four S -100 ELF II connects directly to the video input of your TV set, without any addi- 32 or 64 character by 16 line upper and lower case display on your TV screen or tional hardware, Or, with an $8.95 RF modulator (see coupon below), you can video monitor -dramatically improving your unexpended $99.95 ELF II. When you connectors. Address: Forethought Prod- connect ELF II to your N's antenna terminals instead. get into longer programs, the Video Display Board is a real blessing! ELF II has been designed to play all the video games you want, including a Ask Not What Your Computer Can Do... ucts, P.O. Box 8066, Coburg, OR 97401 fascinating new targetlmissile gun game that was developed specifically for ELF But WHAT CAN IT DO FOR YOU? (Tel: 503 -485 -8575). lt. But games are only the icing on the cake. The real value of ELF II is that it Don't be trapped into buying an expensive dinosaur. simply because you gives you a chance to write machine language programs -and machine language can dlord it. ELF II is more advanced and more tun to use than big none is the fundamental language of all computers. Of course, machine language it computers that cost a lot more money. With ELF II you learn to write and

only a starting point. You can also program ELF II with assembly language and run your own programs. You're not just a keypunch operator. No matter S -100 Video Board. The new tiny BASIC. But ELF It's machine language capability gives you a chance to what your interests are, ELF II is the lastast way to gat into computers. ALTR -2480 is a 24 -line by 80- character develop a working knowledge of computers that you can't get from running only Order from ehe coupon below! S -10C -bus video display board. It fea- Netronics R &D Ltd., Dept PE -8 PHONE ORDERS ACCEPTED! 333 Litchfield Road, New Milford, CT 06776 Cal I (203) 354 -9375 tures upper- and lower -case characters Yes! I want my own computer! Please rush me- D RCA COSMAC ELF II language. it s a learning breakthrough for engineers and laymen plus graphics. The system also has byte led at $99 95 plus S3 postage and alike S5 postpaid Total Enclosed S handling (requires 6 3 to 8 volt AC power D Deluxe Metal Cabinet with plexigla dust cover for ELF II. (Conn res ads taxi mapping (4K by eight), built -in read/ supply) 529 95 plus S2 50 p8h Power Supply (required). $4 95 postpaid CHARGE IT! Exp. Date D I am also enclosing payment Iincludi g postage 8 handling) for write refresh, 2716 user -programmable D Vita D Master Charge D RCA 1802 User s Manual S5 postpaid the items checked below' Tom (Bank EPROM, external /internal sync, nor- s Pittman s Short Course On Microprocessor 8 Computer D I want my ELF II wired and tested weh power supppqlyy. RCA Programming leaches you lust about everything mere is to know 1802 User's Manual and Shat Course -alt ter lust $119.95 plus II mal /inverse /blink control, 500 -ns ac- aboui ELF II or any RCA 1802 computer Written in non-technical 53 Oh. ALSO AVAILABLE FOR ELF II 26 variables A.Z. LET IF /THEN. INPUT. PRINT G0 TO programs and assembly language source list- cess time, and direct drive for a CRT D GIANT BOAROYM kit with cassette l/0 RS 232 produces GO SUB RETURN END. REM, CLEAR LIST. RUN. ings to help understand and improve your programs CITTY I/O 8 -bit P i/0 decoders for 14 separate I/O you PLOT PEEK POKE Cores bully documented and in- $19.95 on cassette tape monitor. Using "Transparent Memory," instructions and a system monitor /editor $39.95 Plus cludes alphanumeric generator required to display SAVE $9.90 Editor Assembler 8 Disassembles 2 p8h -Teol alphanumeric characters directly on your tv screen with purchased together. only $19.95! Video Dis Kluge (Proloiype) Board accepts up to 36 IC s (Require the CPU can access the refresh memory Oil additional hardware Also tick- lack-toe plus a 4k plays Board memory I St7 00 plus St p8h Play plus drawing game that uses ELF II 5 hex keyboard as a joy- D ELF It LigM Pon. assembled 8 tested. $7.95 plus St D 4k Matt RAM kA. Addressable to any 4k page to at any time, the display is glitch -free, stick 4k memory required 514.95 postpaid pan '64k $89.95 plus S3 p8h D Tom Pittman s Short Course on Tiny Basic for ELF II. D ELF II Colo Graphics 8 Musk System Board kit Goid plated 86-pin osseous lone required for each and the CPU is never interrupted. No S5 postpaid $49.95 plus 52 OM Plug in board) $5.70 ea postpaid O ELF -BUG1M Deluxe System Manner on cassette ELF ll connects directly to the video input of your tv Expaamn Power Supply (required when adding 4k D reliance is placed on the peculiar char- tape Allows displaying the contents of all registers on set without additional hardware To connect ELF II io RAM! 034.95 plus S2 p8h your Iv at any pant in your program Also displays 24 your antenna terminals instead. order RF Medulata. D Prolusions! ASCII Keyboard kit with 128 ASCII acteristics of a particular CPU. A multi- bytes of memory with lull addresses. blinking cursor 58.95 postpaid upper /lower case set 96 printable characters onboard and auto scrolling A must for the serious programmer' Corning Soon'. A . D -A Converter Controller Board regulator panty. Agic selection and choice of 4 hand- $14.95 postpaid plexing technique permits nonconflicting signals to male with almost any computer and more' shaking D Test Edeer on cassette tape gives you the ability to access by both CRT controller and CPU. 064.95 plus S2 p811 insert. delete or edit lines and words Irom your programs D Deluxe male cabinet for ASCII Keyboard. $19.95 while they are displayed on your video monitor (Add Print plus $2 50 p8h printer and you can use ELF II to type error-free letters Name Price is $295.00. Address: Matrox Elec- D Video Display Bawd kit lets you generale a sharp plus insert names and addresses Irom your nailing list( professional 16 32 or 64 character by line upper and $19.95 postpaid Address tronic Systems, Ltd., 2795 Bates Rd., lower case display on your to screen or video monitor - D Assembler on cassette tape translates assembly dramatically improving your unexpended 599 95 ELF II language programs into hexidecirtal machine code for (Fns ASCII ) Montreal, Quebec, Canada H3S 1B5 inside Keyboard cabinet 589.95 ELF II use Mnemonic abbreviations lo, instructions City I plus $2 van (rather than numerics) make programs easier to read ELF II Tiny BASIC on cassette tape Conn, and help prevent errors (Tel : $19.95 postpaid 514-481-6838/735-1182). State _ Zip inands include SAVE LOAD. 2 x D Dissembler on cassette tape lakes machine code (continued on page 76) - DEALER INQUIRIES INVITED CIRCLE NO.39 ON FREE INFORMATION CARD AUGUST 1979 75

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 69 Use Quick -Wedge to fasten leads, wire in panelights, COMPUTER BITS connect test equipment, (continued from page 75) TAPE install components DISCOUNTS

S -100 Extender Board. A 7 -segment display logic probe and a pulse - Tac catcher LED, whose brightness corre- CASSETTES sponds to the duty cycle of the pulse SAC-80 2.22 ADC-120 3.79 SAC-90 3.04 DC-45 1.19 stream, are used in the new TB -2 Ex- ADC-45 1.82 DC-80 1.35 ADC40 1.79 DC -90 1.75 tender Board kit from Mullen. The board ADC-90 2.99 DC -120 2.49 DC -190 399 features a general -purpose "kluge" area 8 TRACK D45 1.80 AD-45 229 for circuit development. This section is D-90 222 AD-90 2.99 provided with its own on -board 5 -volt, 1- VIDEO CASSETTES V7-120, 4 hr, 1925 VT-8D, 2 hr, 14.50 ampere regulator that also powers the logic probe. Other features include power supply links for current measurement, Scotch labelled S -100 -bus edge connector, and MASTER I :.. gold -plated connector contacts. Price is C-60 2.59 C -90 2.99 MASTER 111111 They do all that ordinary $35.00. Address: Mullen Computer C-60 2.99 C -90 3.39 Products, P.O. Box 6214, Hayward, CA HIGHLANDER screwdrivers do, PLUS they C-45 .97 C -90 1.89 94545 (Tel: 415 -783 -2866). C-60 1.10 C -120 2.79 DYNARANGE hold and start the screw SC-45 1.89 SC -60 1.89 SC -90 2.59 t S -100 to IEEE Interface. The P &T VIDEO CASSETTE BETA 488 Interface Board permits the broad L -500 13.25 L -250 9.95 VHS 17 sizes spectrum of S- 100 -bus computers to di- VK -120, 4 hr. 18.60 VK-60, 2 hr, 14.25 QUICIHUEDCE rectly interface with instruments and Lifetime Product Guarantee FREE CATALOG Screw -holding screwdrivers Order shipped 1.3 days. Add 52.50 shpg. 6 hdlg. per peripherals that operate on the IEEE 10 tapes. N.Y.S. Res. add sales tax. No C.O.D.S. Unconditionally guaranteed. 488 -1975 Standard Digital Interface for BUY A SET TODAY CONSUMERS CO a -. See dealer Programmable Instrumentation. The P.O. Boo 550 a: your or write to: Mt Vamm. NY IOSSt Plana: 19141 664-2909 Kedman Company, P.O. Box 25667, board comes with 488 cable assembly. Salt Lake City, Utah 84125 Software is distributed as source code in CIRCLE NO. 12 ON FREE INFORMATION CARD CIRCLE NO. 34ON FREE INFORMATION CARD Best price and delivery on ... machine -readable form. An integral "Bit - wiggler" tape interface is used for reading software with a conventional cas- Exidy Sorcerer sette tape recorder. Price is $250.00 in kit, $325.00 in wired form. Address Pick- les & Trout, P.O. Box 1206, Goleta, CA 93017 (Tel: 805 -967 -9563).

New Printers In Town. The Model DP -8000 hard -copy printer from Anadex Thousan ed of Communications Electronics customers prints 80- character lines at 112 charac- OWN A BEARCAP SCANNER. ter /second (84 lines /minute). Printing is But since we've introduced the Bearcat® 250 crystalless bidirectional, via sprocket feed. Al- 15,600 frequency, 50 channel synthesized scanner, our specifications have been improved: phanumerics are formed from a 9 x 7 Sensitivity dot matrix. The complete 96- character 0.4 microvolts for 12dB SINAD on VHF bands, UHF band slightly less ASCII set is available. Basic ASCII in- Selectivity puts include RS -232C, 20 /60 -mA cur- Better than -60dB @ ±25 KHz Audio Output SAVE rent loop, and parallel- bit /serial charac- At least 2.0 Watts rms ter, the last synchronous at high strobe Audio Quality 15% on The BC -250 audio is more noise-free and rates. Three data lines of FIFO buffer NORTH STAR suffers less distortion than comparable storage are available, and data can be models by a margin of 10dB or more. CROMEMCO and Image Rejection accepted continuously or in bursts. Seri- other S -100 Systems The BC -250 rejects image frequencies by at least al ASCII is adjustable to 9600 baud. Up 8dB better in all bands than comparable models. to 1000 characters /second can be fed This month, we've got a special price 10% OFF on the 250. Now, you can own this fantastic into the input. Address: Anadex, Inc., Bearcat® RADIO SHACK TRS professional monitor for only ,$269.00. That's a -80 9825 DeSoto Ave., Chatsworth, CA savings of over $80.00. and accessories (full warranty) 91311 (Tel: 213 -998 -8010). To start Bearcatting, Master Charge and Visa card Complete holders may call and order toll free 800 -521 -4414. line of printers and Bowmar's Model TP -3150 thermal Outside the U.S. and Michigan dial 313-994-4441. disk systems for TRS -80 plus for printer requires no ribbons or ink. It has To order by mail, send $269.00 $5.00 U.S. U.P.S. shipping. Foreign orders invited at slightly an 18- character capacity and uses a 5 x higher cost. Mail your orders or requests for a free WRITE FOR FREE CATALOG 5 solid -state dot -matrix print head. Print catalog completely describing all Bearcat® scanners to: Communications Electronics, Box 1002, iniMicroMart, Inc. direction and character rotation are user Dept. HF1, Ann Arbor, Michigan 48106 U.S.A. Bearcat° is a registered trademark of Masco Corporation of Indiana 1618 James Street, Syracuse NY 13203 Copyright '1978 Communications Electronics PHONE: (315) 422 -6666 TWX 710541-0431 CIRCLE NO. 1 FREE INFORMATION CARD CIRCLE NO.38 ON FREE INFORMATION CARD ON www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 70 THE ONE -STOP MUSIC SHOP AT WHOLESALE PRICES BEST IN NEW ELECTRONICS BOOKS! Design. 8)0 L Pgrm Yr Own Wkng Computer Sys 308 p $7 95 controllable. ASCII data can be synchro- Master Hdbh of 1001 MORE Practical Elect. Ckts 100 p 512 95 Handbook of Electrical Nose Homo) E Technology 280 p S6 95 -TO -REEL REEL Microprocessor Cookbook 266 p. 121 d 95 TAPES Va.( UD 3690 1800 It 96 11 nous parallel or asynchronous serial. BLANK 119116 d How 10 Budd Your Own Working Robot Pet 238 p . 86 5655 95 M. UD 36 WO 1100-1 $1630 The printer accepts the 64 standard AS- Practical Electrical Installation. Repr L Rewiring 406 p SI. 95 TAPES 211 1900 h íA.36 CASSETTE S.std. Radio Control Handbook -4th Edition 420 p. 315 it 5995 nnM..t.,C90 53 11 TOL 1 .2 d. 98 95 4..Yp.' G.4i,.e 9A-w CfO 2.18 R 801210ÌL CII characters and ignores all other The Giant Book of Amateer Radio Antennas 462 p_ 255 BASF SnAw C11 51.11 VIDEO TAPES How to Budd Your Own Working 16,80 Microcomputer 96 p 93.95 BASF i 1..A IOTA FORMAT C80 $2 09 is Bow - Too L 500,3 Bo, 513 75 codes. Price $270.00. Address: Electronic Designer s Handbook -3rd Edition 350 p . 218 it 5995 Won LID c w ... 6Ì11x 1094411 UD C-90 623 Sim/ New) Electrical Hdbk for RVs. Campers. Vans. Boats I Trailers $3 95 .441i UDYL 11 CJO I- mar Instrument Corp., Commercial 144 p.. 85 i) $5.95 BOBO B3.I) 600Ì0h 11 2 R0 V1 65310 Making and Using Electricity From the Sun S.oIN bBYLn-wrhrv, Zenith Lá0012110121) 553.9tÌ 11.111-3 Lasers. the light Fantastic 294 p . 158 it S6 95 C11730L A7,50 01-000 (215050) 912.96 Products Div.. 8000 Bluffton Rd., Fort Scetch Mom( I C410 S2.11 7 95 The Power Supply Handbook 420 . 292 il Smisa Meow II III D90 53.25 VHS FORMAT p - 95 Saw ewW-,+COD. 9311 Sw,ch vi, 350,Iwou 31) Wayne, IN 46809. The Complete Handbook of Robotics 364 p . 137 it 591 .95 TDB D C11 51.20 JVC01201450I1l -.. ne.n 95 Artificial Intelligence 252 p . 118 il S7 SI TOK0.120(1H0I.r) ... 91810 TDK DC100 Fupp0.110 4HOUr1. 91)96 A from Printer Hdbk of Remote Control L Automation Tech 294 p. 250 I 97 95 M 9uJ13 bidirectional printer TDK,OLDCM RCAVRQNHew).. Install Your Own Home or Mobile Electric Power Plant 252 p $5 95 TDRADC90 ! SCAVO -120(2 Howl $1496 l{2.5)$3 Terminals operates at 75 lines /minute Design L Build Your Own Custom TV Games 546 p . 244 it 99 95 SSA 55010 NNVf -IS IIIIS 10K C90 Ii P (4Ìb) Computerast s Handy Manual 64 p . 39 it S1 25 Minimum Order 12 Tapes - 100% Guaranteed. and offers a choice of 7 x 9 or 9 K 9 dot - Digital Interlacing With an Analog World 406 p.. 211 il 95 131 al How to Select t Install Your Own Speakers 238 p . SS 95 It can print up to 95 CARTRIDGES matrix print capability. All About Telephones 192 p . 140 II S4 95 four copies simultaneously. The full Understanding Electronics 182 p . 265 el 14 audio- technica 14 Tested. Ready ToRun Game Programs in BASIC 266 p 5595 AT TOSS 512950 &I 95 AT 15 SS 96- character, upper- and -lower -case Amateur Radio License Study Gde For Novice. Tech. L Gen ClassS6 l 545 95ri Direct Current Motors- Characteras L App 252 p. 170 il 51495 349611754 41950EIN® 134 95 95 4110 11200 VISIYPIIV $4990 ASCII set, plus triple -wide character Design. Budd. I Test Complete Speaker Sys 336 p . 189 d 97 9Ì91965O96 VIS TIPS III S$4 95 Color TV Trouble Factbook -Prob L Sol 4th Ed. 434 p .617 il S7 95 Sr7 50 gals Ed p . 197 II S5 95 ÓÓ font, are available. The operator can Radio Control Manual -Sys. Cuc. Constr 3rd 256 681)15 5 555 00 1EÓ f7 1244E $13 90 p S1 95 69111E $42 50 First Class Commercial FCC License Study Guide 391 1110E3 1990 6901) 121190 choose either 80- or 132- character lines. How to Budd L Use LowCost Hydrophones 110 p . 37 d $4.95 503) 112 60 ® PICKERING Programs in BASIC for Electronic Eng. tech. t E3perim $4 95 Included are RS and parallel inter- II -232C . 150 95 Ef11PIFE $$513000 ------Li995 IOUs Dictionary of Microcomputer Terminology 322 p S7 95 20001 559 90 01501200E 539 Computerist s Handy Databook Dictionary 96 p.. 42 d $39S 10001 131 50 1195,750E 132 50 faces and 2K of memory for full -page 11 303 Dynamic Electronic Circuits 308 p . 303 al $69S 7000E I $19 50 110150625E 125 90 RV154013E 12255 Trucks 1112s S55637 95 800001 179 is designed to accom- Install E thing Electronic in Cars. Boats. Planes. t dump. The printer 95 The BASIC Cookbook 140 p . 49 il CB SWL 132 11.5554 95 'MAMMIES modate roll paper, combination pin form Antenna Construction Hdbk for Ham. L 238 p . 4,ZIRENNiffirMI áIKOSS Radar Detector Handy Manual 80 p . 63 al S2 25 70 S5088 PRO 4M S3990 and roll, and tractor feed. Price is How to Repair Video Games 270 p . 182 it 7.95 574 40 PRO 4AAA $4B00 How to Cast Small Metal and Rubber Parts 144 p . 132 al SS 95 HD $26 28 529 97 95 HO-414 544 BB MV 115 97 $1395.00. Address: Printer Terminals TV field L Bench Servrcer s Handbook 20B p . 165 it 56528 aLC6A 11997 ,1D424 Ramona, CA Cut Your Elect Bill L Install 5011, Own Emerg Power System 51.9556 535, . HOW TO ORDER Fer Y.pnen5 w110.n 4e hours. 0-td TDINY Corp., P.O. Box Instrument L Control Sys Engineering Hdbk 434 p 184 d 919 95 dMBV on Re.0o.w1 Oer a orDfttl dock. To w11k0 dunk. Beginner s Guide to Designing; Building Transistor Radios 94 95 Plume 53.60 yyrr order for Amami 1Mrne. (s5.50 for I 92065 (Tel: 714 -789 -5200). Hdbk Mamt/Repair S695 OTds.-0 ouM.de U.01. N.V.S. modayb old tom. No C.0 0.4. Automotive Au Conditioning -Install. f14411. Al) nioORw.Ar 100% p1vYllw0. 5ru1d Am i Imlay The Master Handbook of Electrical Wiring 406 p . 289 al S6 95 Understand Sound, Video. L Film Recording 140 p. 14 il S595 Single -Board Microcomputer. Towers International FET Selector 140 p . 97 d 94 95 Beginner s Gde to Computers-Microprocessors -with pro) $695 d The 90F /MPS microcomputer from Design I Build Electronic Instrumentation 420 p . 210 S9 95 How to Repair Movie I Slade Protectors 304 p . 270 d 97 95 Quay is based on the Z80 and contains towers International Transistor Selector -2nd Ed 200 p S6 95

Closed Circuit TV Installation. Mamt . L Repair 291p.. 220 il. 98 95

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. 15 STEREO EQUIPMENT CBer s Handy Manual of SSB 80 p 42 il 51 QUALITY 95 RAM and two parallel ports, price is Beginner s Guide to Making Electronic Gadgets S4 PRICES. AT LOWEST Fire L Theft Security Systems -2nd Edition 192 p . 114 d 5595 P.O. 95 $1295.00. Address: Quay Corp., Modern Digital Communications 308 p . 122 it

FOR QUOTA- CB Radio T shooting Repair 2nd Ed 406 p . 169 il 9756 95 YOUR REQUEST Box 386, Freehold, NJ 07728 (Tel: Practical TION RETURNED SAME DAY. M cropr ocessor Program for Computer Hobbyists $8 95 201 -681-8700). Illus Oict of Broadcast CATO Telecommunications 420 p S8 35 FACTORY SEALED CARTONS Hdbk of Marine Electronic L Electrical Sys 546 p.. 338 d 99 35 184 95 - IC Applications Handbook 280 p . il Linear GUARANTEED AND INSURED. 175 d 9556 95 Budd It Book of Optoelectronec Protects 238 p .

I 95 S -100 /Telephone Interface. The Photo Guide to AM FM Stereo Repair 288 p . 281 S7 SAVE ON NAME BRANDS LIKE: Servicing Medial I Bioelectromc Equipment 350 p . 165 al 58.95 162 II $8 95 MK -II transceiver board from MK Enter- Solid State Motor Controls 322 p . I PIONEER SANSUI How to Use AF L RF Signal Generators 238 p. 162 d 5595 prises interfaces an S -100 bus to the Model Railroad Electroncs 308 p 224 d. SS 95 182 131 95 KENWOOD DYNACO The ABC Book of Ha Fs Audio Protects p . il S4 telephone line and uses Touch -Tone 251 S6 95 Repair Small Gasoline Engines. 2nd Ed 392 p . il SHURE SONY frequencies. On incoming calls. vec- 88 Practical Op Amp Circuits You Can Build 140 p . 120 il 94 95 Restoring and Collecting Antique Reed Organs 320 p . 124 li 98 95 MARANTZ KOSS tored interrupts allow for ring detection How to Build Metal Treasure Locators 140 p . 58 it $3 95 Build It Book of Digital Electronic Timepieces 294 p . 209 11 96 95

I S9 95 AND MORE THAN 50 OTHERS and DTMF signalling. This permits call- C E T license Handbook. Ind Edition 448 p . 381 Thud Class FCC License Study Guide 322 p . 88 it S6 95

BUY THE MODERN WAY ing the computer and using the tele- Practical Solid State DC Power Supplies 196 p . 151 d 1695 106 Easy Electronics Prot Beyond the Transistor 244 p 95 95

BY MAIL -FROM phone pushbuttons for entry. A 4 -bit in- How to Repair Home Kitchen Appliances 294 p . 105 it 95 95 d Transistor Ignition Systems 252 p . 162 SS 95 put post allows additional data to be Understanding L Using Modern Signal Generators 294 p S6 95 Color 1V Case Histories Illustrated -Vol 2. 352 p . 243 il 5795 transferred coincident with decoded Microphones How They Work L How To Use Them 224 p SS 95 DTMF. On outgoing calls. the board op- Master Handbook of Digital Logic Applications 392 p . 308 d S7.95 Amateur Radio Nov Class tic Stdy Gd -2nd Ed 192 p . 25 II S5 95 erates at telephone company speeds. A CBer s Handybook of Simple Hobby Piolects 168 p . III d S: 95 Display Electronics 252 p 195 it 55.95

4 -bit output port allows supervision of Complete Handbook of Slow Scan TO 305 p . 169 il S9 95 CMOS Databook 280 p 270 il S6 95 trunk interface equipment (DAA). Single Broadcast Engineering t Maintenance Hdbk 532 p 9196 aud'w Study Gde Ed ST 95 Irnov Radio General Class License -2nd Price is tones can be generated. Optoelectromcs Guidebook 196 p.. 120 d SS 95 $425.00. Address: MK Enterprises. Impedance 196 p . 90 II $5.95 12 East Delaware Switching Regulators L Power Supplies 252 p.. 128 d. 956-9955

8911 Norwick Rd.. Richmond, VA (Tel: SEND NO MONEY! We 11 '80,ce you Cn 10-DAY FREE TRIAL I Chicago, Illinois 60611 n17ney refunded 804 -740 -8380). entne aC'c ate, 100°. guaranteed or you, 312- 664 -0020 TAB BOOKS BLUE RIDGE SUMMIT PA 17214 , CIRCLE NO. SO ON FREE INFORMATION CARD CIRCLE NO. 28 ON FREE INFORMATION CARD www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 71 A "MATCHBOX" is determined by the values of R4 and Cl. LED OSCILLOSCOPE PROJECT The 4017 counter is unique in that it includes a 1 -of -10 REGULAR readers of the Experiment- decoder. This eliminates the need er's Corner are by now familiar with for a separate decoder IC. Fur- thermore, the design of simple solid -state oscillo- OF THE because the activated output of the 4017 goes high when scopes that employ an array of LEDs for a all other outputs remain low, the screen. Thanks to the new LM3914 dot/ 4017 can be connected to the anode of an LED. bar display driver, the design of such a MONTH The remaining two gates in the 4011 scope can be simplified considerably. The form an AND gate that provides an auto- result is a scope small enough to fit inside BY FORREST M. MIMS matic trigger. When MODE switch S1 is a pocket matchbox! closed, the gate resets (clears) the 4017 if Figure 1 is the schematic diagram of a the input voltage has sufficient amplitude compact LED scope that uses only three to activate the lowest -order output of the ICs and consumes only 15 mA. Operation LM3914 at the same time that the lowest - of the circuit is fairly straightforward, espe- order counter output is high. This feature cially if you're already familiar with solid- makes it relatively easy to freeze the waveform being displayed. +9V R/-VERT/CAL 6.,41/,y The "screen" of the scope is a single 5 HORIZONTAL- SWEEP x 7 dot -matrix LED display (Monsanto O vE RANGE LEO MAN -2A, Texas Instruments TIL305, Li- '14 tronix DL -57 or equivalent). Although 35 LEDs 5)c 7 CED ARRAY provide very limited resolution at best, with experience it's possible to visualize square and triangle waves being displayed on the readout. In case you're wondering where the cur- /6 w rent limiting resistors of the LED display are, they are not necessary! The LM3914 /7 3 Fig. 1. Schematic includes a novel feature that permits the diagram of match- current box LED oscilloscope. at the selected output to be externally programmed by a single resistor R3 connected to +9V pin 7. This pin provides a ref- /3 /r erence voltage of 1.2 to 1.3 volts, and the //4t current through R3 is 1/10 the LED cur- yo// 2 7 /O o l 1 3 6. rent. According to Ohm's law, the current /3 flowing through a resistor is the quotient of 4017 15 the voltage across the resistor divided by l/4 RESET s 1 yot/ CLOCK the resistance in ohms. The current

through R3 is therefore 1 mA, which +9V /y means that the LED current is 10 mA. 8 //st /o Figure 2 is a photograph of a miniature, 9 Voti ..L7

state scope basics. The incoming waveform is applied directly to pin 5 of the LM3914, where its instantaneous amplitude is detected by a voltage divider /comparator chain. Decod- ing logic then drives one of the LM3914 outputs low. Any LED in the row connected to the selected output is then eligible to glow. The remaining requirement is a positive voltage at the LED's anode. This is obtained from a horizontal sweep circuit made from a 4011 quad NAND gate and a 4017 Johnson counter. The 4011 performs two important functions, one of which is to provide a stream of clock pulses. This is accomplished by two gates connected as a free -running or asta- Fig. 2. Photograph of the wrapped -wire prototype LED oscilloscope ble oscillator. The frequency of oscillation assembled on a small piece of perforated board about 1.2" x 1.2 ".

78 POPULAR ELECTRONICS

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 72 Project of the Month continued oooo 00000 00 o0 o00000 o 0000 00 OO 00000 O 0000 o o o O 0 oo00 0 O00 000o 00000 o 000 00000 oo Wire -Wrapped prototype scope that I as- o 0 0000 00 oo00 0o000 o 0000 sembled on a perforated board measuring 1.2" x 1.9" (about 3 cm x 5 cm). Notice that pins 9 and 10 of the LM 3914 extend over the lower end of the socket. The small capacitor installed in the two unused pin positions of the 4011 socket is Cl. The overrange LED is installed below the 5 x 7 l 1 I LED array. R1, R4 and S1 Components t Ou -SYNCH are attached to the circuit board with cya- 1I

noacrylate adhesive. I used a miniature

Micro SwitchTM pushbutton switch as S1 V

because I had one on hand, but any other spst switch is suitable. Fig. 3. Sonic typical display patterns obtained

Some typical display patterns I have ob- on a 35- element LED scope. Sometimes, the pattern tained are shown in Fig. 3. Often, the dis- hears little resemblance to the actual wave. played pattern will bear little resemblance to the actual wave. Sometimes it's easier to visually integrate the approximate shape input of the scope. Music and voice signals can add a second 5 x 7 display or make a of a wave by switcning off the automatic will stimulate a dynamic, miniaturized light 10 x 10 display from individual LEDs or trigger and adjusting R4 until the waveform show. For best results, leave the trigger 10- element LED bars. If you're really ambi- slowly parades across the display. switch off. tious, you can add additional LM3914's For some interesting visual effects, try Finally, remember that it's relatively and 4017's and make a scope having 20 x connecting a radio or audio amplifier to the easy to expand the scope's display. You 20 or more LEDs. J THERE'S A BETTER WAY TO GO. Energy shortages tell us we every drop of gas give us the smart move under the hood, helping have to change our driving style. most go for our money. Anyone a nation survive an energy crisis Now! It doesn't with horse sense knows that a and keeping you on the road. Delta mean we have well -tuned car gets better mileage, Mark Ten. The best way to go. to go back to and in times of fuel shortages, horse and buggy better mileage means a lot. days. But it The Mark Ten B Capacitive does mean we Discharge System keeps your car have to make in better tune so it burns less gas. Using Mark 1111111111HINIIIIIII 111111111 Ten B is more than horse sense. It's the

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CIRCLE NO. 16 ON FREE INFORMATION CARD 79 AUGUST 1979

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 73 P.O. Box 4430C Santa Clara, CA 95054 988 -1640 Same day shipment. First line parts only. For will call only: (408) Factory tested. Guaranteed money back. 2322 Walsh Ave. Quality IC's and other components at factory prices. INTEGRATED CIRCUITS ELECTRONICS

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19 061381 1 60 CLOCK MODULES Complete alarm clocks C04585 1 10 23 LM3B2 1 60 ready to hook up wan transformer ana C040192 3 00 17 10470314 d0 witches Very compact *Mt 50- and 74C00 28 63 LM709H ze 6820 9 95 64 digas 17 74004 33 LM713WN 50 6850 12 95 7621002.4, C or E 50 74010 28 1.95 39 LM733N 61 6502 12 50 Transformer 74C14 2.10 2.25 +3oN LM141C14 35 6504 16 50 74C20 26 9416 A. C or E .N 17.95 -4420 50 LM74IN 25 6522 13 60 74030 28 102P2O2P2 2.25 :45N 69 1.6174711 N 62 74C48 1 95 Special transformer and six 60 LM746N 35 IC SOCKETS 74C74 75 switches when purees. 69 82 Sadr Tin Lour Profile 17 74C76 l a0 14.41/module 2.95 LM13o4N 1 10 PIN 1 UP PIN 1UP 74C90 1 15 003 par module 29 LM'305 127 8 15 22 30 74C93 1 40 green fluor. 41.0517 15.95 LM1307 2 00 9 14 740154 3.00 24 35 88 2 75 16 16 28 42 740160 1 44 RESISTORS 'a watt 5 9 e 2 NI LM1458 18 27 36 58 10 type 03 1000 per 012 43 740175 1 35 per type LM1800 20 29 4 40 1 25 per type 025 350 piece pack 43 LM1812 750 74C192 65 14C221 200 w 4.57 100 per type 015 5oer type 675 LIP 3 00 74c905 3 00 RCA Cosmac Super Elf Computer $106.95 69 LM2189 115 taieva,le5p,nw 20 KEYBOARDS 90 740906 75 LM2901 1 50 56 key ASCII keyboard MI 567.50 740914 I 95 Compare features before you decide to 29 1M3900N 60 WIRE WRAP LEVEL S Fully assembled 77 50 buy any board displays provide output and optional high 740922 5.50 34 LM3905 PIN MM 53 key ASCII keyboard k0 60.00 There is no 740923 5 50 other computer. other computer on and low address. There is a 44 pin standard 59 LM3909N 7E, Id 25 24 Bfi Fully assembled 70 00 Enclosure 14 95 740925 39 MC1458V 50 695 16 33 28 100 the market today that has all the desirable bene- connector for PC cards and a 50 pin connector for 740926 6.95 LEDS 69 665509 65 18 57 40 1 23 740921 Reo T01B fits of the Elf The 95 NE555V 43 6 95 15 Super for so little money. Super the Ouest Super Expansion Board. Power supply Green, Yellow 7018 69 NE556A 79 INTERFACE WRY /FIFO 20 Elf is a small single 100 Jumbo Red 20 board computer that does and sockets for all IC's are included in the price NE565A 1 00 8095 95 05 -1013 5 50 Green. Orange. Yellow Jumbo 25 69 NE566V I 50 6096 95 4951014 750 many big things. It is an excellent computer for plus a detailed 127 pg. instruction 9191111 LED Mounting Clap. 851 25 manual which 87 NE567V 20 8097 95 3341 695 87 isoec7 rit. amber. green. yellow, dean training and for learning programming with its now includes over 40 of 915708 5 00 8098 95 pgs. software info. in- 87 NE571B machine 500 8109 125 PROM CONTINENTAL SPECIALTIES In Mod language and yet it is easily expanded cluding a series of lessons to help get you started 78LD5 60 8110 4 50 17024 3 95 Compete line of breadboard test equip 90 78I08 600 81.3 3 00 982523 2 95 MA3Iw 8 digit Fra,. CH. $128.55 with additional memory, Tiny Basic, ASCII and a music and 15 79105 program graphics target game. 8120 5 50 6825123 3 50 OK In Mod 67 i8M05 85 IO 9825126 Keyboards, video character generation, etc. Remember, 8123 3 3.75 Portable Multimeter other computers only offer Super Elf 85 75108 75 8124 3 50 N825129 3 75

7 75491CN DIGITAL THERMOMETER The Super Elf includes a ROM monitor for pro- features at additional cost or not at all Compare 55 50 N825131 3 15 08.50 '42986 1 Batt 65 75492C5 55 8726 1 69 14820136 8 )5 oper. General purpose o,medic4 143694 95 75494GN 32 -230 0 Disposable gram loading, editing and execution with SINGLE before you buy. Super Elf Kit High 89 8728 2 75 N825137 8 15 probe coverco $106.95, '43665 95 8091 1 69 2708 10.50 '112 accuracy Comp. Assy A STEP for program debugging which is not in- 143676 95 la 0 CONVERTER cased F address option $8.95, Low address option 8198 1 69 O 98517 2 90 mod Switches from to C'n 0 cluded in others at the same price. With SINGLE with 6223 2 90 COMPUTER BOARD KAS $9.95. Custom Cabinet drilled and labelled 74100 TTL 1395 MO195938e RAM 11 81Ó 29 50 851 RAM Board Kil $135 00 741.5005 25 Ñ 1595 2101.1 395 2116 Inlet 48 STEP you can see the microprocessor chip opera- plexiglass front panel $24.95. Expansion Cabinet DO 49 EPROM Kn a 7405020 25 8750C3 73 95 2127 e Board 94 ting with the '415040 225 1D130 9 95 1Ó4L4 160 unique Guest address and data bus with room for 4 S -100 boards $41.00. NICad CRYSTALS Extender Board veconnector 0077-N 9400CJVF 140 211021 116 12 'r 5 MHz 74 displays before, during and 9 50 21E02 IV EPROM board k9 OJO PROMS after executing in- Battery Memory Saver Kit $6.95. All kits and xN 25 iCl'10] 1 25 2 MHz á500 N one Mar Floppy KN ICL1107 1.1 25 210464 Din 5655 Or structions. Also, CPU mode and instruction cycle options also 4 MHz 4 25 Mdimnal Onve K9 1... come completely assembled and d0 8702 1795 1076-8 375 5 MHz a 25 2111.1 SPECIAL PRODUCTS are decoded and displayed on 8 LED indicators. tested. 90 375 10 MHz 423 2112.2 MM5865 Stopwatch 'Pole, 9.00 25 0808 395 IB MHz 3 90 PC An RCA 1861 video graphics chip allows you to Guestdata, a 12 page monthly software publica- 25 C034001 Fa,r. 50 011413 6 75 A MHz 390 41 C04000 16 4116 1095 32 MHz 3.90 Mom Pushbutton 7 27 connect to your own TV with an inexpensive video tion for 1802 computer users is available by sub- 25 32168 MHz 400 3 pos slide 25 14M5Ì62 4700 Encoder N00165-5 39 004002 28 6 8432 MHz 4 50 6.95 modulator to do graphics and games. There is a scription for $12.00 per year. 4í530N 1495280 3 Digit Unlearnt 30 CW006 1 10 300 3 5795 9114 120

7405745 1 15 MM5320 9 95 couMer Board KR speaker system included for writing your own 094007 1 0100 MHz 1 95

TERMS: $5.00 min. order U.S. Funds. Calif residents add 6% tax. BankAmericard and Master Charge accepted. FREE: Send for your copy of our NEW 1979 Shipping charges will he added on charge cards. OUEST CATALOG. Include 28c stamp.

CIRCLE NO. 46 ON FREE INFORMATION CARD 80 POPULAR ELECTRONICS

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 74 EPROM'S Special of the Month 1702A -6 $6413 $4.45 256x8 1.5 uS 2708 $9.95 LIKx8 450NS J

MOS Static RAM's Part No. Price 2101 SS $2.39 IS 22 PIN 2102LFPC $149 $1.14 r MICROCOMPUTER i MICROPROCESSOR to 350NS(Low Power) BOARDS 2102.1 PC $ 0.94 HI 1K 45055 SYM -1 MICROCOMPUTER BOARD CPU's 2114 $ $6.75 4K (10 s 4)300N5 5enaa,a.n eeaces ilnelud aK0w cassette won remue Fart No. Price r65q m 6 Dyles se

r6K M61,016 b 5BG.016 S 715 LED212 T -1 3mm Yellow .13 32K MBC.032,6 SaC-032 1125 48K MBC.046/6 SBC-o4a 1475 LED220 T-1-3/4 5mm Red .11 640 MBC-064/6 seC-06s 1795 LED222 T -1-3/4 5mm Green .15 32K MBC-032/16 SBC-032 1125 1-3/4 .14 64K MBC-064,16 sBC W4 1795 LED224 T- 5mm Yellow

314 DISPLAYS S FND357 Si 09 Complete Integrated circuit 375 Common Cathode 4p1$ FND500 500" Common Cathode $ 5109 Texas Instruments data selector. Master guide FND507 500 Common Anode s3.PQ Si 09 lo the I. Including latest C's FND567 500" Common Anode 51.4Q S129 Low Profile Sockets microprocessors and DL747 630' Common Anode 5t96 52 49 consumer arcurts DL704 300" Common Cathode S1bQ St 29 availatle in the Free Quarterlyy Updates Finest Quality Socket .95 DL707 300 Common Anode $1bbQ 51 29 world. Nobody can match Terras Inst- ruments quality -a unique combina- ISOLATORS of I.C. technology and multi - TILt12 Opto Isolator 1500V 5ßlÁ$ SD 49 tion ç' metal expertise. LMCT6 Dual Ooto Isolator 1500V si:ae- 29J Over one million pleceS ln stock. LINEAR Contacts Price Contacts Price LM324N 49 Quad Op Amp PIN 22 8PIN 08 22 LM339N .49 Quad Comparator LM741CH .37 Op Amp 14 PIN 12 24 PIN 24 LM555N-8 29 Timer LM741CN-8 .24 Op Amp 16 PIN 14 28 PIN 28 LM556N-14 .59 Dual Timer L M 1458N-8 49 Dual Op Amp 18 PIN 18 40 PIN 40 LM723CN 36 Voltage Regulator RC4558N-8 45 Dual Op Amp 20 PIN 20 LM723CH 39 Voltage Regulator

P.O. BOX 1035 FRAMINGHAM, MASSACHUSETTS 01701 Over the ounter sales. MINIMUM ORDER $10 00 ADD $203 TO 12 Mercer Rd.. Natick. Mass 01760 COVER POSTAGE 6 HANDLING Beheld Zayres on Rte. 9 Foreign customers please remit paymanl .&11--.Active Telephone Orders 8 Enquiries 1617 íe79 0077 on an International bank drall or International postal Amencan IN CANADA money order in dollars

5651 FERRIER ST 4800 DUFFERIN ST BAXTER CENTRE VANCOUVER 11T-Electronic MONTREAL. QUEBEC DOWNSVIEW ONTARIO 1050 BAXTER ROAD ÿ070 KINGSWAv ANCOUVER, B.0 114P 2K5 M3H 559 OTTAWA ONTARIO Sl7 SR1PS Corp. Tel 15141735 6425 Tel 1416,661 1115 K2C 3P2 Tel: 16041 4 3 83 3 21 Tel 161 31820 9471

CIRCLE NO 4 ON FREE INFORMATION CARD AUGUST 1979 81

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 75 4 -1 -79 QTY. DIODES/ZEN E RS MICRO's, RAMS, - T T L - 1 N91 4 100v 10mA .05 CPU's, E -PROMS QTY. QTV. QTV. QTY. 1N4005 600v 1 A .08 QTV. 7400 .20 7492 .45 74H20 .25 74LS76 .70 1N4007 1000v 1A .15 8T13 2.50 7401 .20 7493 .35 74H21 .25 741S86 .95 1N4148 75v 10mA .05 8T23 2.50 7402 .20 7494 .75 74H22 .40 74LS90 .85 7403 .20 7495 .60 74H30 .30 74LS93 .85 1N4733 5.1v 1 W Zenner .25 8T24 3.00 1N4749 24v 1W .25 8T97 1.75 7404 .20 7496 .80 74H40 .35 74LS96 2.00 7405 .35 74100 1.15 74H50 .30 74LS107 .90 1 N753A 6.2v 500 mW Zener .25 745188 3.00 1N758A 10v " .25 1488 1.25 7406 .25 74107 .35 74H51 .30 74LS109 1.50 74H52 .20 1.95 1N759A 12v .25 1489 1.25 7407 .55 74121 .35 74LS123 74122 .55 74H53 .25 74LS138 2.00 1N5243 13v .25 1702A 4.50 7408 .20 7409 .25 74123 .55 74H55 .25 74LS151 .95 1N5244B 14v .25 AM 9050 4.00 7410 .20 74125 .45 74H72 .35 74LS153 1.15 1N5245B 15v .25 ICM 7207 6.95 7411 .25 74126 .45 74H74 .35 74LS157 1.15 1N5349 12v 3W .25 ICM 7208 13.95 7412 .25 74132 .75 74H101 .95 74LS160 1.15 MPS 6520 10.00 OTV. SOCKETS /BRIDGES 7413 .45 14141 .90 74H103 .55 74LS164 2.90 MM 5314 4.00 8 -pin pcb .16 ww .35 7414 .75 74150 .85 74H106 1.15 74LS193 2.00 MM 5316 4.50 14 -pin pcb .20 ww .40 1416 .25 74151 .95 74L00 .30 74LS195 1.15 MM 5387 3.50 16 -pin pcb .25 ww .45 7417 .40 74153 .95 74L02 .30 74LS244 2.90 MM 5369 2.95 74154 1.15 74L03 .35 74LS259 1.50 II 18 -pin pcb .30 ww .95 7420 .25 TR 1602B 3.95 7426 .25 74156 .70 74L04 .40 74LS298 1.50 20 -pin pcb .35 ww 1.05 UPD 414 4.95 7427 .25 74157 65 74L10 .30 74LS367 1.95 .40 1.15 22 -pin pcb ww Z 80 A 22.50 7430 .20 74161/9316 .75 74L20 .45 74LS368 1.25 24 -pin pcb .45 ww 1.25 Z 80 17.50 7432 .30 74163 .85 74L30 .55 74LS373 2.50 28 -pin pcb .50 ww 1.35 Z 80 P10 10.50 7437 .20 74164 .75 74L47 1.95 74S00 .45 40 -pin pcb .55 ww 1.45 2102 1.45 7438 .30 74165 1.10 74L51 .65 74S02 .45 Molex pins .01 To -3 Sockets .35 2102L 1.75 7440 .20 74166 1.75 74L55 .85 74S03 .35 4.95 74175 74SO4 35 2 Amp Bridge 100 -pry .95 2107B -4 7441 1.15 .90 14L72 .65 2114 9.50 7442 .55 74176 .95 74L73 .70 74S05 .45 25 Amp Bridge 200 -pry 1.50 2513 6.25 7443 .45 74177 1.10'' 74L74 .75 74S08 .45 QTY. TRANSISTORS, LEDS, etc. 2708 11.50 7444 .45 74180 .95 74L75 1.05 74S10 .45 2N2222M 12N2222 Plastic .10) .15 2716 D.S. 34.00 7445 .75 74181 2.25 74L85 2.00 74S11 .45 2N2222A .19 271615v) 69.00 7446 .70 74182 .75 74L93 .75 74S20 .35 2N2907A PNP .19 2758 (5v) 26.95 7447 .70 74190 1.25 74L123 1.95 74S22 .55 2N3906 PNP (Plastic) .19 3242 10.50 7448 .50 74191 1.25 74LS00 .40 74S40 .30 2N3904 NPN (Plastic) .19 4116 11.50 7450 .25 74192 .75 74LS01 .40 74S50 .30 2N3054 NPN .55 6800 13.95 7451 .25 74193 .85 14LS02 .45 74S51 .35 2N3055 NPN 15A 60v .60 6850 7.95 7453 .20 74194 .95 74LS03 .45 74S64 .15 T1P125 PNP Darlington 1.95 7.50 7454 .25 74195 .95 74LSO4 .45 74S74 .70 LED Green, Red, Clear Yellow .19 8080 7460 .40 74196 .95 74LS05 .45 74S112 .60 D.L.747 7 seg 5/8" High corn-anode 1.95 8085 22.50 -7470 .45 74197 .95 74LS08 .45 74S114 .85 MAN72 7 seg corn-anode (Red) 1.25 8212 2.75 ^ 7472 .40 74198 1.45 74LS09 .45 745133 .85 MAN3610 7 seg corn-anode (Orange) 1.25 8214 4.95 7473 .25 74221 1.50 74LS10 .45 74S140 .75 MAN82A 7 seg corn-anode (Yellow) 1.25 8216 3.50 7474 .30 74298 1.50 74LS11 .45 74S151 .95 MAN74 7 seg corn- cathode (Red) 1.50 8224 4.25 7475 .35 74367 1.35 14LS20 .45 74S153 .95 FND359 7 seg corn- cathode (Red) 1.25 8228 6.00 7476 .40 75491 .65 74LS21 .45 74S157 .98 8251 7.50 9000 SERIES 7480 .75 75492 .65 74LS22 .45 745158 .80 QTY. QTV. 8253 18.50 7481 .85 74H00 .20 74LS32 .50 745194 1.50 9301 .85 9322 .65 8255 8.50 7482 .95 74H01 .30 74LS31 .45 74S196 2.00 9309 .50 9601 .30 TMS 4044 9.95 9602 .45 7483 .95 74H04 .30 141S38 .65 745257.18123) 2.50 7485 .75 74H05 .25 74LS40 .70 8131 2.75 C MOs 7486 .55 74H08 .35 14LS42 .95 QTY. QTY. QTY. QTV. 7489 1.05 74H10 .35 741S51 .75 4000 .15 4017 .75 4034 2.45 4069/74C04 .45 7490 .55 74H11 .25 14LS74 .95_ 4001 .20 4018 4035 4071 .25 .75 .75 7491 .70 74H1 5 .45 74LS75 1.20 4002 .25 4019 .35 4037 1.80 4081 .30 4004 3.95 4020 .85 4040 .75 4082 .30 4006 .95 4021 .75 4041 .69 4507 .95 I2L, LINEARS, REGULATORS, ETC. 4007 .25 4022 .75 4042 .65 4511 .95 QTY. QTY. QTY. 4008 .75 4023 .25 4043 .50 4512 1.50 MCT2 .951 LM320K24 1.651 LM373 3.95 4009 .35 4024 .75 4044 .65 4515 2.95 8038 3.95 LM320T5 1,65 LM377 3.95 4010 .35 4025 .25 4046 1.25 4519 .85 LM201 .75 LM320T12 1 65 78L05 75 4011 .30 4026 1.95 4047 2.50 4522 1.10 LM301 .45 LM320T15 1.65 78L12 .75 4012 .25 4027 .35 4048 1.25 4526 .95 LM308 .65 LM323K 5.95 78L15 .75 4013 .40 4028 .75 4049 .65 4528 1.10 LM309H .85 LM324 1.25 78M05 .75 4014 .75 4029 1.15 4050 .45 4529 .95 LM309 (340K-5) 1.50 LM339 .75 LM380 (8-14 Pin) 1.19 4015 .75 4030 .30 4052 .75 MC 14409 14,50 LM310 .85 7805 )340T5) 1.15 LM709(8-14Pin) .45 4016 .35 4033 1.50 4053 .95 MC14419 4.85 LM311 (8 -14 Pin) .75 LM340T12 .95 LM711 .45 4066 .75 74C151 2.50 LM318 1.50 LM340T15 .95 LM723 .40 LM320H6 .79 LM340T18 .95 LM725 2.50 LM320H15 .79 LM340T24 .95 LM739 1.50 INTEGRATED C RCUITS UNLIMITED LM320H24 .79 LM340K12 1.25 LM741 (8-14) .45 7905 (LM320K5) 1.65 LM340K15 1.25 LM747 1.10 7889 Clairemont Mesa Blvd., San Diego, California 92111 LM320K12 1.65 LM340K18 1,25 LM1307 1.75 Out of State 1-800-854-2211 Cable Address:ICUSD Telex: 697.827 LM320K15 1.65 LM340K24 1.25 LM1458 .65 (714) 278 -4394 California Residents 1- 800 -542 -6239 LM3900 .95 LM75451 .65 NE555 .45 NAME NE556 .85 NE565 1.15 NE566 1.25 STREET ADDRESS NE567 .95 TA7205 6.95 CITY STATE ZIP 76477 2.95 95H90 9.95 PHONE CHARGE CARD # BAE Mea EXP. DATE SPECIAL DISCOUNTS

CO D WILL CALL UPS POST NET 10th OF THE MONTH PO # Total Order Deduct ALL ORDERS SHIPPED PREPAID - NO MINIMUM - COD ORDERS ACCEPTED - ALL ORDERS SHIPPED SAME DAY $35 -$99 10% OPEN ACCOUNTS INVITED - California Residents add 6% Sales Tax. PRICES SUBJECT TO CHANGE WITHOUT NOTICE. $100 -$300 15% 24 Hour Phone Service - We accept American Express / Visa / BankAmericard / Master Charge $301 -$1000 20% CIRCLE NO. 29 ON FREE INFORMATION CARD 82 POPULAR ELECTRONICS

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Top -quality devices, fully functional, carefully inspected. Guaranteed to meet all specifications, both electrically and mechanically. All are made by well -known American manufacturers, and all have to pass manufacturer's quality control procedures. These are not rejects, not fallouts, not seconds. In fact, there are none better on the market! Always count on Radio Shack for the finest quality electronic parts! SN -76477 Sound /Music Mercury Tilt Switch 15 Ceramic TTL and Trimmers CMOS Logic ICs Synthesizer IC Hermetically Sealed TlIMorrp Perfect for Alarm ' a + Full -Spec Devices Tr Circuits Direct from Motorola and National Semiconductor 299 Featured in Oct. 198 Popular Electronics 89 Actual Size! detecting low -loss RF trimmer Type Cat. No. ONLY Creates almost any type of sound - Subminiature position- Assorted music to "gunshots!" Built -in audio amp. switch for use in projects or special capacitors. May include both com- 7400 276 -1801 494 Includes 2 VCO's, LF osc., noise gen., applications. Switch is normally closed pression and piston types rated up to 7402 276-1811 494 filter, 2 mixers. envelope modulator, logic when upright, opens when tilted more 500VDC with maximum capacity values 7404 276-1802 494 circuit. 28 -pin DIP. With data /appli- than 45`. Rated 100mA at 24VDC. of 3 to 100 pF. 7441 276 -1804 990 cations circuits. 276 -1765 2 99 275-025 89° 272-805 Pkg. of 15/1.98 7447 276 -1805 994 7448 276 -1816 994 7473 276-1803 490 Top -Quality IC and PCB Accessories 7474 276-1818 594 DPDT Dual 7475 276 -1806 890 a.. Inline Relay 449 7476 276-1813 596 '. A 7490 276-1808 89C 11111 7492 276-1819 896 I ai. 74154 276 -1834 1.39 E ¡IWO* El Ili 14- 74192 276-1831 1.19 Fits Std. Copper clad. 74193 276-1820 1.19 E PC Board. Mountstwo 14 or 16-pin ICs or sockets for bread boarding Pin IC Socket 4001 276-2401 694 21/2x55 1 iha ". 276 -151 2 99 4011 276 -2411 694 LE PC Board. Mounts single 14 or 16 -pin IC or socket. 2/99° 4012 276-2412 79C 276 -024 Pkg. of 2.89 4013 276 -2413 994 © 16 -Pin IC Test Clip. 276 -1951 Sale 1 29 relay is designed for use 4017 276 -2417 1.69 O 16 -Pin DIP Header. With snap -on cover. 276 -1980 Subminiature 1 Contacts OO 8- Position DIP Switch. 275 -1301 99 with TTL or CMOS circuitry. 4020 276-2420 1.69 Coil requires 4021 276 -2421 1.69 4- Position DIP Switch. (Not shown.) 275 -1304 1.49 rated 1A at 125VAC. 1.49 5VDC. Coil resistance, 50 ohms. 4023 276-2423 694 'C. Vertical 16 -pin Socket. For LED displays. 276 -1986 3.99 275 -215 4 49 4027 276 -2427 994 41 16 -Pin DIP Jumper Cable. 18" long. 276-1976 4028 276 -2428 1.29 4046 276-2446 1.69 Handheld 6 -Digit Dig'tal IC 4049 276-2449 794 2495 4050 276-2450 790 Frequency Counter Logic Probe 4051 276-2451 1.49 4066 276-2466 1.39 Reg. Multi -Logic Family 4070 276-2470 790 99.95 4995 Compatibility 4511 276 -2447 1.69 from 5-15VDC 4518 276-2490 1.49 4543 276-2491 1.99 Lead Zero Blanking Detects one -shot low repetition 100 Hz Up to 45 MHz rate, narrow pulses scopes miss. kHz and MHz Decimals Combines level detector, pulse detector and pulse stretcher. Hi -LED Accuracy is 3 ppm at 25 -C or less than 30 Hz indicates logic "1". Lo -LED is logic at 10 MHz. Overload-protected 1 -meg input. "0 ". Pulse LED displays pulse tran- MC14553 3 -Digit Sensitivity, 30 mV up to 30 MHz. 3x41'2". With sitions to 300 nanoseconds, blinks instructions. BCD Counter IC mini -rod antenna, leads, case. at 3 Hz for high- frequency signals Requires 9V battery. 22 -351 ... Sale 49.95 (up to 1.5 MHz). With cables. listed. 65-731 4 95 22 -300 24.95 For Low-Cost Digital Readout AC Adapter. U.L. Custom Printed CMOS chip replaces over 8 separate Computer Data Manuals & IC's in a digital display circuit. Input Circuit Board Kit pulse shaping. Master reset pin. N Semiconductor Handbook 16 -pin DIP. 276-2498 3 49 O Intel 8080/8085 Programming Manual. Handy reference for programming with Intel's assembly language. 62-1377 3.95 RAM Memory ICs E Intel Memory Design Handbook. Explains use of Intel's memory components and support cir- Under 450 nS Access Time cuits in systems. 62 -1378 3 95 © Intel Data Catalog. 928 pages of specifications 1024 x 1 Array. Low-cost static 2102 on most of Intel's standard microcomputer - memory chip. 16 -pin DIP. Buy 8 and 4 Everything you need for making high - related products. 62 -1379 95 save! custom PC boards. CC Reference and Application 276 -2501 2 49 Ea. or 8/14.95 quality Semiconductor 276 -1576 7.95 Handbook. Complete specs and applications for 2114L 1024 x 4 Array. NMOS static popular IC transistors. diodes. RAM. 18 -pin DIP. Extra Resist Pen. 276 -1530 1.29 276-4002 Sale 99e 276 -2504 .... New Low Price 10.99 Extra Etching Solution. 276-1535 2 19 Connectors NEW LEDs Molded Tri -Color A O allir Red Flasher ÁE

Digital Project Accessories Rated 8A @ 250V. Stand rd .093" pin diameter.

+ Bezel with Lens. High- contrast alter for LED displays 3i,.x1" 3.95 Fig. Pins Type Cal No. Each Fig. Pins Type Cat. No Each .7 Displays red. green. yellow. Uniform ii hi lens opening 210 -301. to or output of 0.6 med. Forward voltage. 2.2VDC á Deluxe Molded Display Case. Red lens. Mount up tour 0.6' A 4 Male 274 -224 99e B 4 Female 274 -234 99c 110 1 11 Max. current: 25mA. T1 -4a case style. eight 0.3 LED digits With brackets. /,.x3 hx4x /i!. A 6 Male 274 -226 1 19 t 6 Female 274 -236 3.95 276035 1 39 270265...... A 9 Male 274 -229 1.39 B 9 Female 274 -239 1.39 3 1.49 B 12 Female 274 -242 1 49 D Operates directly from 5VDC power © MA 1003 Clock Case. For car clock modules. Accepts pushbut- A 12 Male 274 -232 blue lens 3'/242'6x2'. source Pulse rate 3 Hz Mau. current 20 mA ton switches (not inc. 1. With Sockets. 5.95 74 -222 P ir 8!1= at 5VDC 276-036 1.29 © 270 -303. 2 -Pi Ma e & Female. (Not shovel WHY WAIT FOR MAIL ORDER DELIVERY? IN STOCK NOW AT OUR STORE NEAR )=!

Prices may vary at individual stores and dealers ShaeKTEXAS 76102 A DIVISIONadle OF TANDY CORPORATION FORT WORTH, OVER 7000 LOCATIONS IN NINE COUNTRIES

AUGUST 1979 83

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 77 Poly Pak,'j," RCoaoMIV s IMPRIZTIOM FRKTIH

LESTEREO AM -FM. GEL /SEL MPX Cat. No, 92CU5853 95 ENERGY TUNER/ PAKS AMPLIFIER Portable Power at Poly Peke Prices'. DIAL Brand New, 4V /e. 2.6 Amp. Slide Hr. Gel Cell storage battery. Uinta consist of gelled electrolyte, volume, enclosed in hermetically sealed plastic, bass, treble, DESK for years of dependable balance service. Compact, only 3 -1/2" x 2 -3/8" x 1- 5/16" in size). Stack Controls! It's Stacked Energy! é to produce 8V, 12V, 24V... or crease the amperage up up 2 d d 'Peake,, TELEPHONE and away. Use for Burglar Alarms. Intrusion Detectors, system.; 4V RECHARGEABLE Hem. Mobile, or Solar Storage Applications. Cat No. 92CÚ97811 995 12VDC 10 AMP Cat Ne, HY GAIN 92cu4007 POWER SUPPLY LED CLOCK KIT* Panel or ease design 3 PC set PARALLEL 'Kit consists of a 3 pc set, transformer, /unction ew /rhea -ums.board. and a National MA1012.12A digital clock module all parts Tr' ENTRY with and IC chip mounted on a 3" x 1 3/8" G -10 ,rte pc board. The RED filtered module measures 3" g 3/4" x 3/16". 0 The I PC boardmodule is mounted in a bakelite frame 3 7/8" a 1 3/ del DIGITAL 4" x 1 /8" with 2 hole. far easy panel mounting. 13 '," on centers/. Cet N.. 92C05443 PRINTER Converts 115V A(' to 12VDC ut 10 Amps fully regulated!Supphe $14.88 yy to 15 Amp Burge Duel tr regulation with Motorola These unique printers feature precision Swiee con- 2X3055 end 29S77á form mr Lee. than struction. 18 columns are divided into 16 ripple, regulation betterFront a 5 %. ExtraEstre large heel sink for for ULTRA numerals. and 2 for alphabetical and trig figures, and COOL operation. Front panel on /off switch, foe,, and mathematical indicator lamp for fingertip contrai. gna6'h 14 high Wt. 916. functions. Each wheel Is 12 position. CO. N. 9X19641 Utilises 275" wide adding machine tape, and dual color ribbon. Printing technique: parallel preasure BANDIT printing. multiple copies. Print Rate: 3 lines per aecond. Operating voltage, 22 to 28 VDC. Comes in %NIJY COMPUTER original packing w /roll of tape. Sine: 6 -1/2" x 3.1/8" x $095,, 5.3/8" Wt. 7 MI7,TITESTER lbs Cat. No. 92C1.15645 1000 ohms per volt íy -9ál n Pr diode protected Single Operation burnout. easures DC volts L "Ono For Th. Road" "CRIMP -ON" PL -259 0 -15 -1150 -1000: AC volts 0 150 DC -15- -1000: current . All Controls art. wert club 1h, ng,ka in the mike..Ail theócntrole you 0 Oma: COAX 4for $1.29 -15 resistance X1000. ma4 M fumble far on the doh, .re pplanted in the Palm of Yom PLUG Sensitivity 1000 ohms /volt Contained In Hand OLUME,e Cat. No. 92CUN64 AC -DC. Uses peolìte cell, DISPLAY, as SPEAKER itselfartsil convient) Quick, Easy plier crimping. included. Size 28's x No located where your fingers do the calking. Cet Me. Soldering! 3V C x low ". Wt. 5 ou. a2CUl64 Strip latio CM. No. 3921 squeere. Metes to 50.239. For RG68 /U 59/U. 40 CHANNEL HIGH POWER Only MINI LECTROS CB BOARD MFD. VOLTS LEADS SALE 25 15 Axial .14 300 CFM 25 29 Axial .17 $1 S0 15 Axial .17 Only$999 50 25 Axial .19 BLOWER 250 SO 100 Axial .21 100 19 Axial .23 Imagine a 300 CFM blower worth $33.00 at a special purchase 100 50 for economy werful Axial .35 savings. Tr dynamically balanced. 210 29 P.C. .32 I t Motor specs 115v,, 2.2 Amp . Housing: Wheel diameter, 5ir E P.C. .33 24" des :housin diameter 7'A 3'ndeep, FLANGE 45' square, HEAVY 300 25 \' INLET 35/16 o 254. All black steel construction. 14" long. 1l5vac SOO 15 p.C 33 Order by kidree with lugs. Use for home, shop P.L. .39 Poly l'ek. hay. up and industry. Wt 12th. Re- 500 25 factory clone out from Hy gain rooved from equipment. Ile. DUTY 1000 P.G. Cat. No. o, you goin' Cat 93CUS15S IS .55 Hoards have Il ealainked 9 Watt An p 600 25 Asia! .59 92CU5719 )'hip, Hf and Mid Tranx;,Ura. und Natn,nal Semi and Value MM aeries l'1,1. May he timed for iii jeter converge,. re b month eerie. "t'H to ln" in 73 Meg / The parts $ 95 Ea alone make it an offer you can't tome 3 ELEMENT Cat. Na. 92CU98a9 120 VAC HOTPLATE Mili "SKINNY-TRIMS" This Top Quality, Muitil'urpose Hotplate features. Built -In Thermostat, Neon "Red" AC Indicator Lamp, 3POTENTIOMETERS3,8" square! Single turn a yle Screw 1N4000 Epoxy Rectifiers and 1/8" Textured Glees Surface for even heat die. driver adjust. 20'6 tolerance. 0.5 tdbuticn. Generetea up to 150' C. 120 watts: Use for Cat. No. Type Volts Sala Watt ratmga,cermet construction. PC photographic applications, laboratory work, aquarium 2377 194001 50 10 for 5 .75 leads. ORDER CAT. NO. AND VALUE heater, plants, etc. Sise: 10 -3/8" 5 T 2379 194002 100 10 for .85 x -3/8" x 1/8 Wt. 1 for $5 lb. 2 oz. Cat. No. 92CU5723 6 for Type -83 2379 1N4003 200 lO for .95 SINGLE TURN FLAT 400 2380 194004 10 for 1.19 2 $ddarrr 100 lR SK 256 2006 49 1 2381 194005 600 10 for 1.39 / 20 200 26 106 SO6 5006 2382 194006 BOO 10 for 1.49 Cet. No. 92CÚ3888 ULTRASONIC "TIE -PIN" SO 500 2.56 206 1006 1 Na. 2383 194007 1000 10 for 1.59 TRANSDUCER CONDENSER MIKE Perfect for dnzcng of pros, t. int K remote / It's e little ejem in star . Only sound LED DEGREE no el.,et,, i;d dr'd Duality. Metal sed, and 2000 SOLAR . "Inseam Y2"' omntdlrectionel. Frequency w i t h .inndard H i Ivlo phone, \ `'ti- WATCH GUTS ( /U:o response 20- 20,000 Hz. Lees tie -'1 Only k WI or FURNACE $595 $298 pin or lapel clip. 600 ohm Imce Cet. No. 92C95379 $ 2.50 dance, 1.5 VDG Cal. Me. ár30 Giant Fr I Flat Magnifying L temn'; $1 49 It's different! ICs f3 unusual' Magnin. like a lens. yet U's net! A Cet... °r iMen'el nee of smell concentric groove& extend from - the center to the Order by ads of the le,ns acting like a giant prism! Each groove bends the Cat. No. LEI)S: Your 97CU511St Cat. No. 92[1.15115g lightt waves that hit it, acting like a e'BEEM conventional convex laam 1781 MICRO T011117 -O- LIGHT" Lightweight.Lightweigh Inexpensive, and extremely PILO short focal length of 1942 0E0 YELLOW Choice 12'. Herne.. the tun's energy with the greens) lem and simple STUBBY w ooden frame! Focus any ir 1502 MICRO NINGLL PIN RED LASER thee.. flammable object and watch 2135 1ÚM50 20 for DIODES it buret into flames within seconds! Size 11' square. 3/32" thick. RED Optically perfect. Wt. 1 Ib. Cat. Ns. 92C93328 MICRA in]] [D"M $2.49 Wavelength 904 rim o 2790 Wage RED CLEAN $5.99 Me. 92.13509 POLY PAKS® L. BE 'PHONED' so. LYNNFIELD. TO ORDER READOUT at. No. MA HOW eta s'INCHER" DIP Switchte Sale Forms: 01940 alware 3944 2 Add when ordering. Only To be exact 78" of an inch .77 Phan,: Postage no.. the COMMON CATHODE, direct SWITCHES 3649 3 .64 (617/ Road: Net catalog number, type 245 -3828 30 T.F .r replacement for Litronic, 747. .99 Ratait: 1618 name et the m.Zlne 5V v4 8 per l.1U 1.19 Del Carmine mMIN T $1 Left decimal. mile Order by St. from and the y .ment. Red. 5164 s 1.5 MINIMUM ORDER: Ordering 3472 S8 Wakefield, each Cat. Mn. 92.03327 Cat. No. 10 2.50 MA

CIRCLE NO. 45 ON FREE INFORMATION CARD 84 POPULAR ELECTRONICS

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 78 DIGI-KEY TOLL 1 r CORPORATION -Rflfl- , -- 4' VISI Quality Electronic Components FREE MN., AK., HI. RESIDENTS 2 78-68 7-6674 rn

I.C.'S RESISTORS TRANSISTORS CAPACITOR DIODES I.C. SOCKETS 8 PINS SWITCHES SUPPLIES CLOCK MODULES OPTOELECTRONICS BREAD WADING IL TESTING DEVICES DRAFTING DATA BOOKS HEAT SINKS WIRE TOOLS... AND MORE... WRITE FOR FREE CATALOG TEXAS INSTRUMENTS GOLD THE MA 1023 by PANASONIC ELECTROLYTIC CAPACITORS oc et Prices RADIAL LIA AXIAL LEADS NATIONAL 1 EDGEBOARD CONNECTORS Panasonic 1 19 190 1 19R DISC CAPACITOR KIT 1.03 5353 .17 140 11 67 SEMICONDUCTOR 12 .03 8.53 .l) 1.10 11.61 Slashed 12 17 1.40 11.61 1.03 853 THE "PROGRAMMABLE" 12 1.03 8.53 17 1.10 11 m MODULE 35V 12 1.03 ..60 11.61 CLOCK 13 1.0 G.óé Ì1 iv um WIRE WRAF TIN 8056 SOLDERAI AND All 12 1.03 8.53 .11 1.40 11.61 SOLDfRT4R SOURS ARE LOW PROFILI FLJ Ip 12 1.03 8.53 .17 1,40 14.61 WIRE WRAPSOCXRS ARE STANDARD PR09ILE /LIYELS 3 IM 9.08 .20 1.69 14.07 o 15 175 10.42 23 I.01 15.01 11.01 sc,1111111J ¡HIM .. ,] 1.09 908 20 1.69 8.57 B Pm 5171der Tab 08 13 1.09 9.0 21 14 11.19 14 46.00 SoldrEy 101 15,91 1 CST 14 Pin Solde Tob lá0 V 18 148 12.33 23 18,60 16 -ST 16 PM Solde Tob 6 1.60 .19 164 1165 26 2.21 WI. Wrap 1,69 148 1 ,.16 9.60 20 151-ST 18 Pin Solder Tob 18 1.90 B.00 .11 1.11 15.01 2017 20 Pin Solder Tab 20 2.00 20 3 All E. COST-EFFICIENT CONTCT DES ON CI 159 19 1.61 1140 77 1.21 10.60 22.57 22 Pin Solder Tab 22 2.20 2200 A Inky wt. 0 11 1.12 11.31 10 1.51 11.35 50 (WM WNW Se 75 (adder MI) n14raW.M. E 13 1.11 9.22 70 1.69 1107 24-57 14 Pin Solder Tab .24 2.40 24.00 ever .11k1.I dNkW11 SINN, SSSSSISSSSSSSTTf1 7,16V 5 1.15 1042 .23 .91 15.01 28 ST 28 Pm Solder Tab 78 2.80 18.00 ST Como ,144.1 Nn CA 115 aBaT. iti, *Zi 17,54 IS 1.15 10.12 16 4.21 1860 4031 40 Pin Solder lob O 1.00 4000 Mlerrwd anN9tpants. .7, NIGH DIGITS - RED LED DISPLAY 4135v 21 1.13 11.31 11 2.65 7103 8_WW 8 Pin Wire Drop ... .24 2.30 20.50 15 PoPdr V103114 Pnkad.d, an111er.r 44dm dwlEn. An Auort nnl of 150V 22 1.84 34 2.0 11.12 IS 1.25 1ó1] 15.91 II.WW 14 Pin Wire Wrop 26 2.50 22.00 Cawn4 are wer na.n4le. 310 DISC CAPACITORS OV 19 1.61 1340 76 2.24 18.00 1600 16 Pin Wire Wmp .30 05 25 50 wn ok.r.9,. kN. n. n. Ne r..e.. n.6...nn...n Nk... ONLY $2295 W 1.81 1110 31 2.65 2705 10 18 Pin Wire Wrap .. 60 5.70 5100 - -2. 1035V.. 33 1.81 15.28 Al 3.18 30.95 70 6.65 59.50 2.WW 20 Pin Wire Wrap _ __ 100 781 2110 .43 3.61 0 00 W4 SERIES .100 "x.100" EDG[OARD CONNECTORS 509.. 33 22.WW 22 Pin Wire Dr. Bd 8.00 750 220 109 .. .11 1.74 19.50 1027 220.16V .. .21 1.81 15113 .33 2.65 21.05 Pin Wire Drop 96 9.10 81.50 E E .6 node Pot 030.006,1.08 F-Wer 24 I.r TRONI HARDWAR KIT .21 1.71 1448 11 3.51 29.7 5 1.12 10.00 510 220'35V Bow 1F Pin Wire Wrap .]6 3.09 2570 49 4.11 3544 1.36 1150 1915.00 210 35v... d0 -WW 40 Pin Wire Wrop 32.59 .58 94 .10 30 Er 3114 640073 Pledul I. 0.0314. 1i2 14.48 .29 2.34 19.50 252 141 1. 264 7104 77 OD 3302V 7l 1528 .,1 2.65 21 85C 820.9 3.0 215005PM 330116V.... 32 2.15 2225 .42 3.57 2749 330.759 31 2.60 2161 5 106 3178 330 35V . 6 192 32:59 54 462 38.18 Ili;:iIZII;Uti1 33E3509 . 75 6.41 51.51 Sá;1 2.65 22.05 25 250 11,1330731713 (.074743C70111 470169 11 I.76 .41 470'109 . 32 2.0 21.32 151 29.49 2413 . 4.02 33.41 7401 .18 111501 .28 11049 .15 I70'16V .31 192 .47 111902 1100I9 >0 25V . 36 109 2370 35 1.12 39.18 1401 .18 .R 2J CC7R1-- 73 . 57 4.89 4073 62 5.25 43.70 1<2503 .25 740385 .25 C9SM6 .50 70 35V 114504 .19 140109 25 50V . B3 709 59.03 .N 7.50 6243 1404 213519 .16 11Nrv enwnre m 9A 01 .ap- n. ^rvdurrv .90 wa '70 6V. 34 1714 2166 17 101 33.34 1405 .2Y 711505 .24 74C10 493564 1.10 000 1000 109 110 2180 12 442 .713 7406 711518 .19 11009 .25 1,3519 1.10 37 169 dd 3.75 31.23 .57 .86 4360.43 7107 .21 I,5509 .. 74C3oN 1F11141 16 1000 7108 1dC31N 00 159. 5 641 5130 80 .64 1610 .213 LM10146 .44 vat un.-v. P r k OwNv 1409 .21 110129 .98 1001359 BO 6.85 57.02 94 7.90 6618 1M301N .64 paw vdo10 1,03. mor omit vm 740186 1.28 ' 4. 200" I DG! B O A RCONNECTORS on. .I8 1.08 3104 .57 1.86 40.72 7410 42511 .28 LMT006 I CO 210162, .11 5.10 44.13 74 632 51M 7411 .2T 741513 17 74639 1M3116 .90 2200 109 61 44 33111,13, 36.100 pre. 5102 .88 750 62.18 7412 .21 74019 1M317T 3.00 1600 PIECES OF 1068 12 . 1.01 8.91 7148 1.11 9.45 18.68 7413 .25 74015. 70 1M311MP 190 STEEL 7100,259 11339 1.38 ZINC PLATED 495 330 69. 67 510 47.49 .113 6.61 S5.08 742510 .25 LM319N 270 veN -w,L .we,4 tad y.rn op 140856 338 $ 1 004,0 very.e 6 7.98 61.03 7416 25 LM310MP-5 1.30 HARDWARE ONLY 330.1OV 80 6.83 91 91 14 152121 74.66 .N - 9.15 18.68 1417 .25 110 330116V ..1 05 1394 7148 1.11 1415 .28 LM320MPd Fe, 0160,191.'1 740909 .98 1 12.64 105.39 1.51 13.12 10.30 1420 .21 741516 33 164.320M7A 1.30 DIGI-LET SWITCHING PANEL RIT MAI023P 3300'259. 18 7421 25 IC93H .9B 1.09 10.54 741517 12M2069 1.30 410'6V.. 83 ]17959 1.10 T eI TORS 1. 7423 .35 1M310MP-121.30 SILICON 470'10V 99 843 i005. 2] 10.43 86.81

2733 1 7415 35 11C10N .70 191055 23 102 50 922 50 4700 146 1715 10315 1.0 1176 106.31 741530 .213 LM320MP.151.30 ]¢1506 1.tl WIRE-WRAPPING WIRE 1.21 7416 15 IMTAMP.181.30 263901 20 1 10 1625 '49 843 70.25 1036 86.1] 142331 .33 JIC151N 1.90 25 7427 13 1 70 16 25 ,46 25 PRE STRIPPED 1 30 11.81 98.37 1.48 12.63 10525 LM120MP.10130 183906 1 PRE CUT - 8800109 11C151N 190 1B9 16.19 134.138 LM320MP-211.30 I 03 1760 IS 50 144537 33 71[1519 1.90 264124 Ire tar Wire Wimp.. Aw6- 3010.15 MM) IONA 7430 21 193233 130 1642! 10,000!69. 1.38 11-8T 98.37 1.11 12.55 10454 ]4[1609 1.18 164126. 2 185 wire. per wciee4 Stripped l'_Rent Ends 4 1 25 LM324N 12 =Wirw 10,00.13V. 1.89 16.10 134.88 ]1140 28 74C16134 118 169101 2 930 1750 1575+ LM3151.1 2.70 2 93 1750 15' U 740629 I.II LM326N 110 161103 PANASONIC POLYESTER CAPACITORS 74047 79 11C1636 1 18 ]430 5 1M21N 110 264110 2 20 7000 10415ANCI 7415413 MO YIN nines 10, o 77 7/39 50 71(1645 110 2 10 100 180f. L6L33914 1.15 145081 COD PRICRI PIA OP 1110 74149 99 1801655 110 1.77 1M3101-5 1 25 365080 2 2000 Imo 1800 74C17324 1.30 40. 1442 53 1,15 Ora 111336.164 and 161,40 to JI .28 14C1746 1M34016 2115210. 2 20 21 50 702 ' 1.777, 146102341.1023 Cod, Module 05. 1445 10 LT 116 125 7A1107 DOI 141555 20 1101191 1.16 LM3407B 16457 5 4.66 11 50 383 o 1.77 1446 10 1M3101.10 1.25 1101926 1.38 97P014 3 30 7750 217 '57 gg11 1441 10 1443101.11 1.25 1118 .70 7I01919 1.38 vaPUlo 3 30 153 725'. 1167 1/0131 74,274 .30 I513401.1 F 1.25 31 Ywvnll,umlwmnrw611073 ]I50 21 )4C1 95N 1.10 91PU45A 3.0 2500 225 r' 741515 53 1.24310119 1.25 1020 Odorm10,0, ier .1023 7451 71 11C2216 1.N 27.50 LM3407.1 115 92PU51A 3 330 117 .18 807.959 12d8 12750 11022' 2M341 F-5 .58 9612955 7.4 10737 Conamtionoi 3.0 a., onlisonorn 04.4 P410730 Ì<5é .21 76 80C969 .49 17 741583 1663117a .93 MIE112 5 80 4000 wc^r 21 80C9]N 48 0 34 74 85 98 1M417-8 .9B 4 21.50 has 73anTerann 0056 00C909 .18 7615182 50 0231i CR.31 ARA. Coma. 1,lÓ LM311P.10 .98 647 popg 11C9019 .18 B1F3439 5 4.00 000 141590 .51 17634117-12 .98 tae 0087 7473 30 11[909 IB 167341 BO 400 01 If 14 1M311P-15 98 45: JMJ DIGIT . DISPLAY 7409099 1 IZ LM311P113 .99 M7E310 60 50.0 173 741593 _57 015 7 85 74C915 780 1 SD 67 50 561 5. 1.0341924 .98 1471371 6 00 ÌáÌ6 32 740266 -780 143106 1.60 1202520 510 50 275t 26 614 1M3496 I 60 MIF511 5.70 1750 42- 51-_.w_ e FOR 3 04 1183 144510 .3v MA100T 74251079 .39 M1E]0] 6.0 500 4500 400(MOf ÁN BS 030 37 7415111 .39 jm6 818112 5 4.80 400 360 0 MA1010 7 .81 047 7425113 .39 4003 1M13102 M38123 '50 31.50 337 50 LM18W6 91 056 44 1115111 19 401 ä3 50 62 50 507 50 Troublefree Module! ,eAANND Ig 7490 1,10 M1UE03 é 3 441113019 11 07 7491 .10 1415123 ,79 1 95 45 405 0 55 4006 123 4M1812N 4.0 MPFI(12 0 270' Swivel Mount! IId1RA'3 ]16125 9 1141830N 1.30 AW52219A 1 93 1150 157 50 7493 .44 4007 .23 1800 eitS Inlaid Walnut Chrome CLOCK 14611-20-34 4008 .79 L1889N 2.00 69623196 s 2 20 200 01 7194 70 1.1 73 793132 BI L4111114 1.25 2 30 1.00 Trim 7495 10 409 44 9953907A1 100 Bezel! la 146136 .39 150 MODULES 36 4010 44 M3901N 9143391 2 07 10900 Ideal for Car, 7196 70 1115138 .13 1.50 1675 12 VDC - 4011 .23 LM29175 91943393 93 -7 50 151 50 ]115139 .13 4011 LM3095 110 Van or 58411 PATENTED CNROMAFILTR SCION, DIE UST MITAL NAME 74107 .30 Av53391 s 2 20 2000 16000 2388 714 SO 1415151 15 013 40 43W01 SB IN P4N113 UP 10 37 IA' 1511([, NO 1810581 NAND- 2 20 10 00 ISO MOUNTS 4011 16 M95355 0 Tall4 96 LM39o5Nt 3.5(0 "X2.3(16" WANE, SCRATCH 5881S7ANT AND EASILY C4EANID, 141501ATES I161.16 1 93 1750 15150 742514 1.10 4015 96 MT909N 61 9953563 11121 METALLIZED POLYESTER 35 1 15150 Deep! G ARF. PANASONIC 7415165 75 10 MP53565 93 1) 50 2.1/0' 6.116 IIHMPLNTMWMTING 746156 .IS áói7 105 1.0 M1V43638A 93 17 50 157 50 ENE To Install MOUNTING ADAPTERS 11123 .61 56V Part No. 50019 Quick and CAPACITORS .75 17 AIMMM[NI 116157 4018 105 MCI4569 .53 1 93 50 57 50 (1!9ÿT 17411475 8'53b41 ]46158 15 151 R P 1019 0 .l0 1 . 6 MC14969 Milbd3 93 1 50 50 00 163 4021 114 MC330P I S FOR MAI001 6.1002 1115 746160 419918 1 93 1750 15150 420 MOUNTING 33141 16 In 1040 1.14 71132 10 4021 193 I750 15750 96 695930 .61 1141 08 746162 60 21 50 202 50 427 UNIVERSAL PC BOARD MOUNTING 40877117 NE5SSV 7 115163 1 13 74145 10 ADAPTER 10561.1013 . .015 ;023021 .84 X85560 54 TP112 8 40 10.0 630 00 423 MOUNTING 74147 1.63 746164 1 174 Olt 1015 23 31010 070 12 50 652 50 40 13 91 50 677 50 68 0100 11150 I.ÌÁ 11131 1021 b 8E5596 110120 `0 17773 3 74151 1461 40 8 89 NE5600 1 50 T1p121 13 20 1100 900 12331 033 116173 10. 111 711127 .5 1310 110 00 900.00 77303 ]461 103p 23 655628 3.50 PIn 1370 110 0 990 0 403d 3.50 NE5654 1 15 056 74155 .70 14611 P135 IS t3 10 110 00 990 00 4035 114 1155669 I20 4156 70 110190 6.90 57 50 51.50 74157 70 4010 114 59561V 1.39 4041 19 UA]000V 11130[ 8 090 5750 5'750 WRAPS UNWRAPS 74160 88 - 12 I 90 4042 19 711310 810 7000 63000 74161 79 ]]16191115193 5% CARBON FILM RESISTORS PANASONIC TRIMMER POTENTIOMETERS 7154 74162 ]1619) 106 1043 10 TIP32C 10 0 70 72 50 652 00 4044 10 60 90 50 517 RTMENT 3 .88 VA123U 7131610 6 SS 50 1/4 WATT RE I TOR AS 046 186 .15 116 18 8 V 18111 /11 74164 96. UA733U n'62C 8 690 57 50 517 50 7714 1000 la 3 13 26 41 733 17 74165 115 7415196 .86 IM9 0 U4141CV 44 4i 3 0 78 63 257 74166 126 4050 10 UAII]U .70 63. 00 4051 1.x6 UAI48CV .19 WATT ZENER DIODES SILICON DI0015 7474 47 74170 164 ]41S2í0.35 56 761131/1 1052 26 UA7805CU 1.25 59.90 175 RS I 15 11174 98 UA7E06C11 2128 4060 158 t))B0N 1,25 7 1951218 16V 1651138 13 164002 80 00 o 63 5 35 44 A 00.67 4066 19 60 00 74110 19 746243 170 1810CU .1.15 1652188 3.99 1651418 1<9 164003 80 59.90 12.15 1071 23 UA1812CU 1.25 16577913 4.39 1951458 15V BO 7 94 R5125 164004 ,005 7004 4071 23 DI 6 64 AA 64400 1951308 1.7V 19524613 16V 1 00 9 00 74624] 1 164005 3.55 50013 60 00 4073 13 UA7815CU 1.25 1652118 17V ÌÌ18 115 ]16218 199 16573113 1V 1.006 1 00 5 00 WATT RESISTORS ASSORTMENTS 7727 1075 :23 U47818CU 1.15 1 POLYESTER 14182 .19 164007 1 00 9 00 PLESSEY MINIBOX METALLIZED PANASONIC RESIN DIPPED TANTALUM 01 23 U4781CU 1.5 1X52338 6.02 1X50698 19V 741842/9 1 48 1 UA 7810540T .40 1252508 20 CAPACITORS CAPACITORS 5111 105 U478LO6A[2 .40 3586.eV 13 11 SLIDE SWITCHES 14189 3.50 746258 75 Palm 044 41 71 VW, UA18100ACZ .40 368 1.5V 1552518 01 SPST 15 1 25 10 10 00,C 341 1601 1.30 1,00 11190 173 146260 34 PROW 48031 II. 4C3 1 11191 05 VA18110ACZ .10 31B8.2V X525385 7013 ,710 C 30 130 30 1 UA1512116[1 233p8p881313.74 1N52518 27V OPOT .23 1 00 10 16 00 60 14192 88 ]16310 .3v 23 .a :V12 114 UA101.I5AC2 .tl 1060 610V 22 .079 31 261 71 /5 73 71193 .88 16273 1.78 3,00 75.00 ]1194 88 4s2o 114 UAIBLIBACZ .10 ]IfN v1Óÿ 'Ñ5256fi 9509 746D9 .IS FREE CATALOG on wirw 353633 G 33 30 4511 1.68 U478L21ACZ 10 INS2418 119 N525]8 339 11195 88 7415283 .79 30 VA1905[V 1.10 74196 .88 116290 .65 2021 30 '30 30 U41906N 1.10 14191 .80 ]16193 625 DIGIT DISCOUNTS SA VE YOU EVEN MORE! 1 DOUBLE 74198 119 145195 I.1 VA7900CU 10 8080A U61909CV 110 VOSUMF DISCOUNT IL 73 141. 1.19 )462Po 1.0 8094 40 '18' 2.2 76 70 45 716352 99 805 .67 V4791201 1.10 11NDLING CHARGE .30 ,337 70 CHIP 110 I 09 041915CU 110 74257 7411353 104 BW6 .67 VOLUM u68918CV 270 All items cue. ...96 319PM 101600 6 7115365 .67 60 31 151: 262 60 14298 94 8099 61 V6I921CU 1.10 SET numbers e.i. with Ole suffiaND 1565 67 08 moy be combined for discourtt. First 46367 67 1450 EA 20 01g ro 74366 .67 1451 .101 Ill discountable Items col 46368 67 8212. 8224 - 0.00499.99 NET 1435 bl 1111n1=11 apply Ine volume dismount. Wan aid PANASONIC DISC CAPACITORS 74368 67 )453 .61 MA153115 3.15 8228 . Less 10% ]115380 .39 ond le Itin 106-14101 the nondmantobist 100.00.5249.99 1110.461. 7644 .61 ML55037 7 30 7445305 111 PLUS SIXTEEN dean Add Me Dandling Ohm. We 75491 .131 IN 1491 81695 17 500.004999.99 . Len 20% 16493 1.194825111 70 rinses t. 11 5 A ald Canada when ALL FOR 3 - S100.001 Up ... Ns Chaps aa 15P1 60 trains AP 1.1. 57 MICROPROCESS RS $44.95 1.117 by Obone or Mail 30 15 75 Ordws Accepted NARDWAPE 8112 0117 i PORT STRANDED M Ole ego VISA COD CALKS Money Order GO ..... 7 16 SCREW 19 C (215 601.6674 HOOK UP WIRE P 0. Se Thlof RN*, FAIN, Minn. 36701 8121 CLOCK GENERATOR 8/78 S, TEM CONTROL. 220,00 2.80 IOC 1. 25. 0150 74 876. C MMUNICA7106S INTERFACE 0 50 Zá/l row' 24 co PVC 2.80 10111 25,500 .311 60011 74 0255 PERIPHERAL W.F. 10 SO 3500 I 7026 2K EPROM USEC S 71 C1151 00000 35.10 2708 1. EPROM 150 NSEC S 75 01.727 00113110 4.20 2-56 NEX NUT 75 C S41.32 00333110 210.NC IOLOW POWER 450 665C RAM 1 69 DIGI-KEY VEX NUT 75,C 4-10 1141 3500 SC 5 SC 9P CPU 9 95 MP VOL' means 35 75 7650 MICROPROCESSOR I 25 .7 CIOCII 40 OIL 74 01 1-171112T D1103 CVO NO lOCKWASSIEN 85 C 0073 Quality Electronic Components 60 I 1.0[KWASSIER 55 C OOP 01.0 15 Toll Free 70/3 934106 2501 Bipolar 1.31 Rom 42 3 5 57. Riva Falb, MN 56701 121016014679 I TO 50 Wats P.O. Ba 677 Thief 03194 1.

CIRCLE NO. 17 ON FREE INFORMATION CARD www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 79 TELEPHONE /KEYBOARD CHIPS 74002TTL I' Digital AV-5-9100 Push Button Telephone Dialler $14.95 (n* EXCITING NEW KITS AV-5-9200 Repertory Dialler 14.95 SN7472N .29 Thermometer Kit AY-5-9500 CMOS Clock Generator 4.95 SN7400N 16 SN7473N 35 SN74160N 89 JE600 HEXADECIMAL AV-5-2376 Keyboard Encoder 88 keys 14.95 SN7401N 18 SN7474N 35 5074161N 89 ENCODER KIT HD0165 Keyboard Encoder 16 keys 7.95 5074020 18 507475N .49 SN74162N 1 95 FEATURES: 74C922 Keyboard Encoder 16 keys 5.95 SN7403N 18 SN74760 35 50741630 89 Full 8 bit latched output for micro 5N7404N 18 SN7479N 5.00 SN74164N 89 use ICM CHIPS SN7405N 20 507480N 50 SN74165N 69 processor 3 User Dellne keys with one being br ICM7045 CMOS Precision Timer 24.95 SN74060 29 SN74B2N 99 5N741664( 1 25 stable operation ICM7205 CMOS LED Stopwatch/Timer 19.95 SN7407N 29 SN74830 59 SN74167N 1 95 Oebounce orcull provided for all 19 ICM7207 Osdllator Controller 7.50 5074080 20 SN7485N 79 S074170N 1.59 keys ICM7208 Seven Decade Counter 19.95 SN7409N 20 SN7486N 35 S0741720 6 00 1E0 readout to verily entrres ICM7209 Clock Generator 6.95 SN7410N 1B SN74890 1 75 5074173N 1.25 Easy intenacing with 16 SN74111,1 25 SN7490N 45 SN74174N 89 standard pin IC connector NMOS READ ONLY MEMORIES SN7412N 25 SN7491N 59 SN741750 79 Duai s -switching control for In- Only -5VDC required for operations MCM6571 128 X 9 X 7 ASCII Shitted whh Greek 13.50 SN7413N 40 507492N 43 SN74176N 79 door /outdoor or dual monitoring MCM6574 128 X 9 X 7 Math Svmbol 5 Pictures 13.50 5N7414N .70 SN7493N 43 SN74177N 79 FULL 8 BIT LATCHED OUTPUT -19 KEYBOARD Continuous LED .8 ht. display MCM6575 128 X 9 X 7 Alphanumeric Control 13.50 SN7416N 25 5074940 -40°C to 100 65 S0741790 1.95 The JE600 Encoder Keyboard provides two separate hexadecimal úrccy ° l / Character Generator S474170 25 Acc -1 nominalna SN74950 65 314741804 79 digits produced Horn sequential key entries to allow direct prog- Set for Fahrenheit' or Celsius reading SN7420N 20 SN7496N 65 5N74181N 1 95 ramming for 8 bit microprocessor cr a hit memory circuits. Three Sim walnut case - AC wall adapter Incl. MISCELLANEOUS SN7421N 29 S474974 3 00 84741824 79 Size 3- 1/4 additional1 keys are provided for user operations wEh one having "Hx6- 5/8""Wx1.3/8' D TL074CN Quad Low Noise bi -tel Op Amp 2.49 SN74220 39 50741004 89 SN741814 1.95 a bl8table output available The outputs are latched and monitored TL494CN Switching Regulator 449 SN74234 25 SN74107N 35 SN74185N 1.95 with LED readouts Also included Is a key entry Strobe TL496CP Single Switching Regulator 1.75 S474254 29 54741095 59 50741860 9.95 11C90 Dinde 10/11 Presczler 19.95 3474264 29 S4741160 1.95 54741884 3 95 JE300 $39.95 95H90 Hi -Speed Divide 10/11 Prescaler 11.95 S474275 25 511741215 35 657419011 1.25 JE600 $59.95 4N33 Photo -Darlington Opto- Isolator 3.95 SN7429N .39 36741224 39 54741914 1 25 MK50240 Top Octave Freq. Generator 17.50 5474304 20 54741230 49 5474192N 79 TIMEX 71001 DS0026CH 5Mhz 2 -phase MOS clock driver 3.75 3474324 .25 307412514 49 54741934 79 DISCRETE LEDS- LIQUID CRYSTAL DISPLAY TIL308 2r red num. display w /integ. logic chip 10.50 5474374 25 34741264 49 34741944 89 .200" dia. CLASS II MM5320 IV Camera Sync. Generator 14.95 6474384 25 34741320 75 SN74195N 69 XC556R red 5S1 .125- dia. FIELD MM5330 41/2 Digit DPM Logic Block (Special) 3.95 5574394 25 34741360 75 58741965 89 XC556G green 4'$1 XC209R red 5/$1 EFFECT LD110n11 31/2 Digit A/D Converter Set 25.00 /set 3474405 20 54741414 79 54741975 89 XC5565 yellow 4/$1 XC209G green 4/$1 6474414 XC556C clear 4/51 89 SN74142N 2 95 31,1741984 1 49 XC209Y yellow 4/$1 SN LITRONIX ISO -LIT 1 76477 5474425 49 50741430 2.95 54741994 1 49 .200" dia. .185" dia. Photo Transistor Opto- Isolator SOUND GENERATOR S874434 75 54741445 2 95 54746200 4.95 XC22R red 5 /S1 XC5268 red Generates Complex Sounds 547444N 75 54741455 79 5474251N 1.79 XC22G green 4/51 (Same as MCT 2 or 4425) 60526G green Á1 Low Power - Programmabe 5574454 75 34741475 1.95 50742794 79 XC22Y yellow 4/S1 XC526Y yellow 4/51 5574464 69 S4741484 1.29 54742834 2 25 2/99¢ .170" dl. XC526C clear 4/$1 4 DIGIT - 5" CHARACTERS 3.95 each 5474475 59 34741504 .89 51,1742845 3 95 M0108 red 4/51 THREE ENUNCIATORS 3074485 79 35741514 34742954 3.95 TV GAME CHIP AND CRYSTAL 59 .085" dia. .180" dia. 2.00" X 1.20" PACKAGE 5474504 20 35741524 59 31174365N 69 XC111R MHZ red red 5/51 INCLUDES CONNECTOR 5474514 MV50 6/$1 20 66741530 59 35743664 69 XC111G green 4/51 includes scoretleplay, 6 games aad seeict angles, etc. 7, 95 5474531( .20 35741545 .99 54743674 69 INFRA -RED LED XC111Y yellow 4/51 71001- Trenamieaiv 57.95 /set 3474544 .20 50741555 79 58743685 69 1/451/4 "st /16"flat XC111C clear 4/51 71001A-Reflective 8.25 XR205 58.40 XR2242CP 1.50

5474594 25 50741560 79 511743905 1 95 5/$1 66210 4.40 XR2264 4.25 3474604 20 341741575 65 35743938 1 95 XR215 4.40 EXAR X62556 3.20 DISPLAY LEDS XR320 1.55 JE2206KA 14,95 192567 2.99 TYPE POLARITY NT PRICE TYPE POLARITY NT PRICE XR-L555 1.50 JE2206KB 19.95 XR3403 1.25 CD4000 23 004070 55 09555 .39 X64135 1.25 MAN I Common Anode-red 270 2.95 MAN 6730 Common Anode-red _ 1 560 99 XR1800 3.20 CDa001 23 C/MOS C04071 23 MAN 7 XR556 .99 XR4151 2.85 2 5 x Dot Maton -red 300 4.95 MAN 6740 Common Cathode -red -O. D. 560 X62206 4.40 CD4002 23 C04028 B9 C04072 49 MAN 3 XR587CP .99 XR2207 X64194 4.95 Common Cathode -red .125 25 MAN 6750 Common Cathode -tea _ 1 560 3.85 CD4006 1.19 C04029 1 19 C04076 7 XR567CT 1.25 X64202 39 MAN 4 Common Cathode-red 187 1.95 MAN 6760 Common Anode -red 560 99 XR2208 5.20 3.60 004007 25 CD4030 49 C04081 XR1310P 1.30 XR4212 2.05 23 MAN 7G Common Anode -green .300 1.25 MAN 6780 Common Cathode-led 560 99 XR2209 1.75 CD4009 49 004035 99 C04082 23 MAN 7Y 59148809 3.85 XR2211 XR4558 .75 Common Anode -yellow 300 99 01701 Common Anode-led x 1 300 99 5.25 004010 49 C04040 1 XR4739 19 C04093 99 MAN 72 Common Anode-red .300 99 01704 Common Cathode-red 300 99 XR1488 1.39 X62212 4.35 1.15 C04011 23 C04041 1 25 C04098 2 49 MAN 74 Common Cathode-rad .300 1.25 0L707 Common Anode-red 300 99 591489 1.39 XR2240 3.45 064741 1.47 004012 25 004042 99 MC14409 14 95 MAN 82 Common Anode -yellow 300 .09 0L728 Common Cathode-red 500 1 49 TYPE VOLTS W PRICE CD4013 39 C04043 89 MC14410 14 95 MAN 84 DIODES Common Cathode -yelmw .300 99 01741 Common Anode -red 600 1 25 184002 100 PIV 1 AMP 12,1 00 004014 1 39 CD4044 89 MC14411 14.95 MAN 3620 Common Anode -orange 300 99 01746 Common Anode -red 1 630 1 49 TYPE VOLTS W PRICE t 184003 200 PIV 1 AMP 1211 00 CD4015 I 19 C04046 1 79 MC14419 4 95 MAN 3630 Common Anode -orange t 1 300 99 01747 Common Anode -red 600 1.49 10746 3 3 400m 411.00 1114004 400 PIV I AMP 1211 00 04016 49 004047 2.50 MC14433 19 95 MAN 3640 Common Cathode -orange 300 99 01749 Common Cathode-red x 1 630 1 49 18751 5.1 400m all 00 1444005 600 PIV 1 AMP 101 00 C04011 1 19 C04048 1 MC14506 75 35 MAN 4610 Common Anode-orange .300 99 0L750 Common Cathode -red 600 1.49 15752 5.6 400m a/1 00 144006 800 PIV 1 AMP 10 /1 00 CD40t8 99 C04049 49 MC14507 99 MAN 4640 Common Cathode-orange 400 99 01338 Common Cathode-red 110 35 10753 400m a/1 104007 1 C04019 49 6.2 00 1000 PIV AMP 101 00 004050 49 MC14562 14 50 MAN 4710 Common Anode-red 400 .99 F0070 Cathode Common 250 69 10754 6.8 400m 411 00 103600 50 200m Oil 00 C04020 1 19 04051 119 MC14583 3 50 MAN 4730 Common Anode -red I 400 99 FN0358 x 1 99 - Common Cathode 357 14757 9 0 400m 4/1 00 104148 75 10m 151 00 CD4021 1.39 CD4053 1 19 CD4508 3 95 MAN 4740 Common Cathode-red 400 99 F40359 Common Cathode 357 75 18759 C04022 1.19 12.0 400m 4'1 00 1N4154 35 10m 12.1. DO C04056 2 95 CD4510 1 39 MAN 4810 Anode- Common yellow 400 99 F40503 Common Cathode(FND500) 500 99 10959 8.2 400m 4/1 104305 75 23 00 25m 15/1 00 C04023 C04059 9 95 04511 1 29 MAN 4840 Common Cathode-yellow .400 F4D507 99 Common Anode (FND5101 .500 99 15965 15 400m 411 D0 144734 CD4024 79 5.6 10 28 004060 1 49 C04515 2.95 MAN 6610 Common Anode -orange D. -O. 560 99 5082-7730 Common Anode-rad 300 1 30 185232 5.6 500m 28 1w 004025 23 144735 6.2 28 04066 79 CD4518 1 29 MAN 6630 Common Anode-orange 1 .560 t 99 HOSP'3400 Common Anode -red 800 2.10 105234 6 2 500m 184736 C04026 2 25 28 6.8 1w 28 C04008 39 C04520 1 29 MAN 6640 Common Cathode -orange-0.D. 560 99 H051,3403 red Common Cathode 800 2 10 155235 6.8 500m 28 1N4738 8.2 1w 28 C0402] 69 C04069 45 C04566 2 25 MAN 6650 Common Cathode- orange - I 560 99 4 x 7 sel. 19 5082-7300 Digit-RH0F 600 95 105236 ].5 500m 28 104742 12 1w 28 MAN 6660 Common Anode -orange .560 99 5082.7302 d s 7 Sol Digit -CHOP 600 19.95 74000 39 74C163 249 155242 12 500m 28 104744 15 1w 28 MAN 6680 Common Cathode-orange 560 99 5082.7304 Overran4e character (HP 600 1500 74002 39 74C00 740164 249 145245 15 500m 28 181183 50 PIV 35 AMP 1.60 MAN 6710 Common Anodered -D D. .560 99 5082-7340 4 x 7 Sgl. Digit-Hexadecimal 600 22 50 15456 74004 39 74085 2.49 740173 260 25 40m 6/1 00 101184 100 PIV 35 AMP 1.70 15458 150 7m 6'1 00 141185 150 PIV 35 AMP 1.70 74008 49 74C90 1 95 740192 2 49 184850 180 10m 74010 1 5/1 00 1141186 200 PIV 35 AMP 1 39 74093 95 740193 2 49 RCA LINEAR CALCULATOR CLOCK CHIPS MOTOROLA 80 104001 PIV 1 74014 1 50 AMP 12/1 00 181188 400 PIV 35 AMP 95 74095 1 95 740195 2.49 3.00 CA30131 2.15 CA30820 2.00 CHIPS /DRIVERS MM5309 94 95 MC1408L7 54 95 74C20 39 740107 1.25 740922 5 95 CA20231 2.56 0430830 1.60 MM5725 02.95 905311 495 MC140818 5.75 74030 39 740151 2 90 74C923 8.25 SCR AND FW BRIDGE RECTIFIERS CA30357 2 48 045312 4 95 MC14391 2 95 CA30860 85 885738 2.05 150 'a 74042 1 95 740154 3 00 74C925 8 95 C360 400V SC14(24118491 SI 95 CA3039T 1 35 CA3089N 3 75 MM5314 4.95 1,40302211 2 95 74C48 2 49 74057 2.15 740926 8 95 C38M 35A 3 5 6005 SCR 1.95 CA30460 1 30 CA3130T 139 DM 1.00 53'5 6.95 MC3061P 50 74073 89 74C160 2 49 . 80095 1.50 202328 1 BA VV 300V SCR CA30595 3.25 CA31401 1.25 DM8887 75 MM5318 995 MC4016(744161 7 50 50 74C74 89 740161 2.49 80097 1 50 MM5369 MC4024P MDA 980 -1 12A m SOV REC. CA30800 3 25 C43160T 1.25 DM0889 75 2.95 3 95 PR BRIDGE 1 95 78MG 1 75 1071011 79 CA30B0T 85 49 MM53137:10900 4.95 MC4040P 6 95 AIDA 980 -3 12A rP. PA, REC. CA3401N 9374 7 54g 2005 BRIDGE 1 95 LM106H 99 LM711N 39 CA30818 2.00 MMS641 9.95 MC4044P 450 LINEAR CA3600N 3.50 C.A. LOD driver 1 50 LM300H 80 LM723N/H 0106131 50 10340K-18 1 35 55 TRANSISTORS 203904 411.00 LM301CN/H IC SOLDERTAIL LOW PROFILE (TIN) SOCKETS 35 LM733N 1 00 MPSA05 18340K-24 1 35 - 30 203055 89 203905 4/1.00 1 -24 LM302H 75 25 -49 50 -100 1 -24 25 -49 50 -100 MPSA06 LM340T5 125 LM739N 119 5'1 00 MJE3055 1.00 203906 411 00 8 pin LP LM304H 1 00 .$10 16 .15 22 pin LP t 37 T1597 LM340T-6 I 25 LM741CN/H 35 3fi 35 8.1 00 283392 5/1 00 204013 3'1 00 LM305H 60 14 pin LP .22 20 24 pin LP 38 71598 1M3401-8 1.25 LM741-148 39 37 36 6il 00 2N3399 511 00 204123 6/1 00 16 pin LP 22 21 .20 45 LM307CN'H 35 28 pin LP 44 43 404D9 1 75 1M340T-12 1 25 LM747N/H .79 PN3567 3/1 00 P04249 411 00 18 On LP 29 28 .27 60 LM308CN/H 1 DO 36 pin LP 40410 1 75 1M340T-15 1 25 LM748N'H 39 59 58 PN3568 411 00 P54250 4..1 00 20 LP 34 1M309H 1 ID pin 52 30 pIn 1P 40673 LM340T-18 1.25 LM13100 2 95 SOLDERTAIL STANDARD (TIN) 40 83 62 .61 175 P03569 4100 204400 4'1 00

LM309K 1 25918 25 LM3407-24 1 25 1041458CN41 59 4/1.00 019536380 3 6 ST f 39 90 11 5'100 284401 411 00 LM310CN 1.15 14 pin 5T 9.27 25 24 pin LM358N 1 DD MC1488N 1.39 2022194 2/I.00 MP53702 3628 pin ST 1.39 1 26 1.15 5.1 00 204402 4/1 00 LM311N/H 90 16 pin ST 30 27 25 103708 1 95 MC1489N 1.39 2022210 4;1.00 00 4r1 40 pin ST 1.59 145 1 30 203704 5/1 204403 00 LM312H 18 pin ST 35 32 30 95 LM373N 3.25 LM1496N 95 2022220 5/1.00 0PS3704 5100 244409 5/1.00 LM317K 50 24 pin 5T as 45 42 SOLDERTAIL STANDARD (GOLD) PN2222 Plastic LM377N 4 00 181556V 1 75 7.1 00 203705 51 00 285086 4/I OD LM318CNM 50 24 pin 5G f 70 63 57 LM3B0N 1 25 4.4017413CP 3.00 202369 5'100 0P53705 5'100 245087 40.00 8 pin SG LM319N 30 S 30 27 24 2e pin 00 1.10 1.60 90 40 LM380CN 99 LM2111N 1 95 24423694 00 203706 5.1.00 2115088 411 00 14 1M320M-5 35 pin 5G 35 32 .29 % pin SG 1.65 1.40 1.26 1M381N 1 79 LM2901N 2.95 MP52369 5.I.00 MP53706 511 00 205089 4t00 16 pro SG 38 35 32 1932055 2 35 40 pm 5G 1 75 1 59 145 183820 1 79 L3053N 1 S 282484 4'100 203707 5.100 205129 5'1 00 18 pin SG 52 47 43 LM320K-12 35 2N2906 4 1 865018 8 00 LM30650 1 49 WIRE WRAP SOCKETS 00 253711 5,1 00 PN5134 5.1 00 LM320K-15 35 NE510A 6 202907 51 00 00 L039001034011 49 85 75 2037240 65 P05138 511 00 LM320K18 8 pin WW I 39 3B 31 22 Pon WW f.95 35 NE529A 4.95 (GOLD) LEVEL u3 PN2907 Plastic 711 00 2037254 1.00 2N5139 5'1 00 10 pin WW 45 41 37 24 pin WW 1.05 95 85 LM320K-24 35 NE531H'V 3 95 LM39090 1.25 1 202925 5/1 00 203772 2 25 2415210 5.1 00 14 pin WW 39 38 37 28 pin WW 140 1.25 10 1M320T-5 25 NE536T 6 00 MC5558V 1 1 59 1 MJE2955 25 283823 DO 205449 3/1 00 16 pin WW 43 42 41 36 pin WW 1.59 45 1.30 LM320T-5.2 25 0E5401 6 00 8038B 4 95 40 WW 1.55 140 203053 21.00 203903 5(1.00 205951 3100 18 pin WW 75 6B .62 pin t75 LM320T-8 25 NE544N 495 LM754508 49 LM320T-12 25 NE550N 1 30 75451CN .39 LM320T-15 25 NE555V 39 1545204 39 1/4 RESISTOR CAPACITORDISC CAPACITORS CORNER LM320T-18 25 WATT - ASSORTMENTS 13 10 9U IyÇ 100 605560 99 -5% 1_9 1099 75453CN 39 LM320i-24 25 10 pf 05 04 03 .001µF D5 04 035 NE56DB 5 00 75454C0 39 LM323K-5 ASST. 1 5 ea 22 p1 05 04 03 .0047µF 05 04 035 95 NE5618 5 00 75481CN 79 50 PCS $t75 1013240 d7 pl 05 04 03 01µF 05 04 .035 80 0856213 5 00 75492CN 89 LM339N 120 pf 05 04 03 022µ0 06 05 04 99 NE565N/H 1 25 75493N 89 ASST. 2 5 ea 50 PCS 135 220 pl 05 04 03 .0474F 06 05 04 1M340K-5 35 NE566CN 1.75 7549400 89 470 of 05 04 035 10F 12 09 075 1M340K-6 35 NE567V;H 99 RC4136 1.25 100 VOLT MYLAR FILM CAPACITORS LM340K-8 35 NE570N 4 95 ASST. 3 5 ea 004151 2.85 50 PCS 1.75 001 ml 12 10 07 022mí 13 11 08 LM340512 35 LM703CN'H 69 R04194 5.95 0022 12 10 07 047mí 21 17 13 LM340K-15 35 LM709NM 29 904195 4.49 0047mí 12 10 07 1X1 27 23 17 ASST. 4 5 ea 50 PCS 1.75 01 rte 12 IO 07 22m1 33 21 22 741100 29 7415138 89 4-20% DIPPED TANTALUMS( SOLIDI CAPACITORS 741501 29 74LSOOTTL 7411139 89 5 ea 1135V .28 .23 17 1.535V 30 741102 741547 89 7415151 ASST. 5 50 PCS 26 21 29 89 1.75 1535V 17 741551 28 23 22,25V 31 21 22 741503 29 29 7415155 89 ,SCn 1100 2255V 28 23 17 3 3/25V 31 27 741554 29 22 741504 35 7415157 89 5 001, 4'ne ASST. 6 ea SGOLA 6u. B2n. 50 PCS 33 35V 28 23 17 4 705V 32 28 23 141555 29 1.75 741505 35 1415160 15 47'05V 28 1.OÁ 23 17 6 5255 36 31 25 741106 741573 45 7415161 29 15 .68'355 28 23 17 15/25V 63 50 40 741574 45 ASST.7 5ea 1 06' 741509 35 7415162 15 se PCS 1.75 1 0355 28 23 17 741575 59 741510 29 7415163 15 MINIATURE ALUMINUM ELECTROLYTIC CAPACITORS 741576 45 ASST. 8R Includes Resistor Assortments 1 -7 (350 PCS.) $9.95 ea. 741511 75 7415164 25 Á41a1 Leed Radial Leed 741513 741578 49 47í50V 15 13 47,25V 59 7415175 99 $10.00 Min. Order - U.S. Funds Only Spec Sheets - 25d 0 15 13 10 741503 1.0/50V 16 1 741514 1 89 7415181 14 47/50V 16 14 11 25 49 Calif. Residents Add 6% Sales Tax 1979 Available 741585 Catalog Send 41d stamp 3 350V 14 12 1 741515 35 1.25 7413190 15 - 9 0/16V 15 13 10 741586 Postage 5 % Insurance desired) 4.7,25V 15 13 0 1 16 741120 29 45 7415191 15 -Add plus $1 (if 0/255 14 11 10,250 15 13 0 1 16 741521 35 74LS90 59 7415192 15 0'505 14 11 1010V 16 14 2 47 16V 15 13 10 741522 35 741.592 75 7415193 15 PHONE 22125V 17 15 2 4 7,250 15 13 10 141526 35 ]41193 75 7415194 15 22'50V 24 99 ORDERS 20 B 4 7'50V 16 14 11 741527 35 741595 7415195 15 47 25V 19 17 5 10 16V 14 12 09 741528 35 741596 1 15 ]415253 WELCOME 99 47150V 25 21 9 1525V 15 13 10 741530 7415107 45 29 7414257 89 ameco 100/25V 24 20 8 (415) 592 -8097 10,50V 16 14 12 741532 7415109 45 35 7411258 1 75 ELECTRONICS 100/500 35 30 6 47150V 24 .21 19 7415112 741537 45 45 7415260 69 2201255 32 28 5 100/16V 19 15 14

7415123 1 741540 35 25 7411279 75 MAIL ORDER ELECTRONICS - WORLDWIDE 220.505 45 41 8 100.250 24 20 18 7415125 470,25V 741542 89 89 7415367 75 1021 HOWARD AVENUE, SAN CARLOS. CA 94070 33 29 7 100/50V 35 30 28 7415132 99 7415368 75 1000'160 55 50 5 220'16V 23 17 16 7415136 40 2200/16V 70 62 5 470/25V 31 28 7415670 2 49 ADVERTISED PRICES GOOD THRU AUGUST 2

88 POPULAR ELECTRONICS

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 80 MICROPROCESSOR COMPONENTS The Incredible Checker Transistor -8060A/8080A SUPPORT etolOS MICROPROCESSOR MANUALS 9 95 103" BOBOA CPU S M.280 user Manual Si 50 "Pennywhistle Completely Assembled - 8212 8.131t Input/ Output 3 25 - MCOP1802 Manual 7 50 - Battery Operated - 8214 Priority Interrupt Control 5 95 M.2650 UserUr l 5 00 The AS Tr ¿nec, o, Checker is cap- 8116 9-Directional Bus Driver 3.49 able of checking a wide range of 8224 Clock Generator Driver 3 95 ROM'S 8226 Otis Driver 3 49 transistor types, either "in circuit" 2513121x0) Character Generator(up0er heel $9 95 The Pennywhislle 103 is capable al recording data 10 and Rom audio lape without or of circuit. To operate, 8218 System Comrolle, tut Driver 595 case) 9 95 2513130211 Character Senecatorllower to communicate directly with 8278 System Controller 5 95 critical speed requirements for the recorder and 114 a5le simply t plug cthe transistor to be 2515 Character Generator 10 95 terminal lot leleptOne 'hamming and Carom.tr.MRS. In front panel 8151 Prog. Comm 1 0 (USART) 7 95 another modern ana checked the MM52305 2048- 8t React Only Memory 1 95 it is tree 01 critical adjustments and is own with non -precision, readily evadable socket, O connect it with the alli- 8253 Prop Interval Timer 14 95 addition. gator clip toes leads provided. 8255 Prop Peripn 1.0 IPPII 995 RAM'S pans Fr y.Snrh Keying lull -duplex Ihall.duplex 8157 Prog. DMA Control 19 95 Oeta Transmission Method The u safely t and automatically 1101 56X1 Static S1 49 8259 Prog Interrupt Control 19.95 selectable) low, medium and high- 02451 Dynamic 99 1103 Maximum Dale Rate 300 Baud power' PNP and rNPN transistors. 880018800 SUPPORT DEVICES 5654 Static 95 210111101) Date Formal Asynchronous Serial harem to mark level required See 33.' 6'., 2" MC6800 MPU 514 95 Static 75 2102 024X1 between each character) "C batrery not included MCSB02CP MPU wan Clock and Ram 24.95 024X1 Static 95 "cell 21102 Receive Channel Frequencies 2025 Hz for space. 2225 Hz for mark Ram 5 95 MC6810APi 128 %8 Static 2111(81111 5654 Static 95 Transmit Channel Frequencies Switch selectable. Low (normal) = 1070 space, MC6821 Froth Inter Adapt IMC6820) 7 49 95 2 112 5694 Static MOS 1270 mark High - 015 space. 2225 mark TransCheck $29.95 ea. MC682B Popery Interrupt Control dr 12 95 450ns 95 2114 024X4 Static Receive Sensitivity -46 dbm acoustically coupled MC683018 1024 %8 Be ROM 81 14 95 1MC59630 21141 024X4 Slab 450ns toe power 95 Transmit Level ...,.. . 15 dom nominal Adluslable from -6 Om MC61350 Asynchronous Comm Adapter 7.95 Custom Cables & Jumpers 21143 024x4 Static 300ns 95 20 dbm MC6852 Synchronous Serial Data Adapt 995 low 95 2114L-3 02454 Static 30055 power Receive Frequency Tolerance Frequency reference automatically adjusts to . MC6860 0600 bps Digital MODEM 12 95 95 5101 56X4 Static allow for operation between 1800 Ht and 2400 Hz +4.11; MC6862 2400 bps Modulator 14 95 09641 Dynamic 95 5280'2107 Digital Data Interlace EIA 95.232C or 20 mA current loop irecerver is 880A Ou S'State Bus Trans IMC6T261 2.25 75 6ad 7489 654 Static Ostolaclaled and non -polar, MICROPROCESSOR CHIPS -MISCELLANEOUS instate 95 - 745200 5891 Static Power Requirements ,,.,,., 120 VAC. sngle phase 10 Watts CPU 819.95 Static 95 - 93421 56X1 Physical All mount on a single 5 by 9 components Cables -11 CPU 24.95 16 pin 95 DB 25 Series 28061780 UP0414 N Dynamic panted oircuit tRara All components Included Price COP1102 CPU 19 95 (MK40271 Part No. Cable Length Connectors -dunes a VOM Audio Oscillator Frequency Counter and Or Oscilloscope to asp 2650 MPU 19.95 5.0415 6K Dynamic 16 pin 95 D1325P -4 -P Ft 2-0P25P 515 95 ea 6502 CPU 11.95 (MK41161 Ft. 1 -DP25P 1 -25S S16 95 ea DB25P4,S 8035 8 -Bit MPU w:' dock, RAM, 1.0 11nes 19.95 TM54044- K Static 95 D9255-4 -S ft 2 -DP25S S17 95 ea esse5 CPU 19.95 4551 TRS TM59900JL 95 -80 Dip Jumpers 16 -Bn MPU w'nardware. munlply TMS4045 02454 Static S divide 49.95 2117 6.384 %1 Dynamic 350ns 95 JJ14 -1 tT 1.14 Pin 51.59 ea SHIFT REGISTERS (house marked) 00 1 1 MM5262 24%1 Dynamic Kit ft Pin 79 ea Bo Dynamic S 50 Conversion DJ16 -1 -'6 MM500H Dual 25 16K MM503H Dud 50 Bit Dynamic 50 0J24 -1 ft. 1-24 Pin 2.79 ea PROM S Kit MM504H Dud 16 Bit Static 50 Expand your 4K TRS -80 System to 16K. CJ14 -1 -14 ft 2 -14 Pin 2.79 ea. MM50SH Dud 100 Be Static 50 1702A 2048 FAMOS $5 95 comes complete With: 4J16 -1 -16 ft 2 -16 Pin 3.19 ea MM510H Dual 64 Bil Accumulator 50 2716INTEL 1fio' EPROM 59 95 16F' 49 95 11 Pin 4 Bit Dynamic 89 TMS2516 EPROM DJ24 -1 -24 2 -24 95 ea MM5016H 500:512 ' 8 each UPD416 -1 (16K Dynamic Rams) 250NS 25041 1024 Dynamic 3.95 (27161 ' Requires single .5V power supply For Custom Cables & Jumpers, See JAMECO 1979 Catalog for Pricing 95 2518 Hex 32 Bit Static 4.95 TMS2532 4K %8 EPROM 89 Documentation for conversion 10 2522 Sua1132 Bit static 2.95 2708 BK EPROM 95 29 95 2524 512 Static 99 27161.1 16e" EPROM CONNECTORS 2515 1024 Dynamo 2.95 '-Requires 3 voltages. -511 5V, -12V TRS-16K $75.00 14 2527 Dual 256 Bit Static 2.95 95 49 2528 Dud 250 Static 4 DO 6301;1(7611) 1024 Instate Bipolar 3 2529 Dual 240 Bo Bobo 4.00 6330 -117602) 256 Open C Bipolar 2 95 CASSETTES PLUG (Meets RS232) 52.95 3 95 COMPUTER DB25P (as pictured) 2532 Duca 80 en Static 2 95 82523 3208 Open Collector 19 6 EACH 15 MINUTE HIGH D6255 SOCKET (Meets RS232) $3.50 2573 1014 Static 2.95 825115 4096 Bipolar 95 . Filo 6 95 825123 3298 Testate 3 95 0551226 -1 Cable Cover for DB25P or D825S $1.75 3341 QUALITY C -15 CASSETTES 49 74186 512 TTL Open Collector 9.95 74LS670 454 Register File IToStatel 2 PLASTIC CASE INCLUDED 74188 256 TTL Open Collector 395 . PRINTED EDGE -CARD USAT'S CIRCUIT 745287 1024 Static 2 95 12 CASSETTE CAPACITY A.4 -5 -1013 30K BAUD 5 95 st Spacing.Tin.00u01e Read -Out - Biluraded Contacts -tits 054 to 070 PC C ds ADDITIONAL CASSETTES 15'30 PINS (Solder Eyelet) $1.95 =M= CONTINENTAL SPECIALTIES AVAILABLE #C- 15 -S2.95 ea 18'36 PINS (Solder Eyelet) $2.49 22:44 PINS (Solder Eyelet) $2.95 Profo Board 203 Pro o Board 2034 50,100 (.100 Spacing) PINS (Wire Wrap) 56.95

50 100 ( 125 Spacing) PINS (Wire Wrap) R681.1 $6.95 $14.95 (Case and 6 Cassettes) 4 -Digit Clock Kit SUP 'R' MOD II Bright .357" ht. reo display UHF Channel 33 TV Interface Unit Kit Sequential flashing colon Wide Band B/W or Color System 12 or 24 hour operation TV to Video for Extruded aluminum case (black) * Converts Display Pressure Switches for hours, minutes & hold functions home computers, CCTV camera, Includes all components, case and wall transformer Apple II, works with Cromeco Daz. Sure: 3u. x IX. x 142 Pe 203 475.00 Pe 203A 4124.95 It) zler, SOL -20, IRS -130, Challenger, JE730 $14.95 Model L,WsH Model La WeH etc. Inches Price MOD II is pretuned to Channel 33 Numbg I Chas Price Number PB -6 6.0 )14.5x14 515.95 PB 102 70x4.5 x 1 4 525 (UHF) PB 103 544.95 Jumbo PB -100 60 )14.5x14 519.95 90060414 P * Includes coaxial cable and antenna PB -101 6 0 x 4 5 x 14 52295 PB -104 98 )180x14 554.95 transformer. 6 -Digit Clock Kit THE PDM35 SINCLAIR 100 MHz MOD II $29.95 Kit our .630 .30C'ht, anode 4 s50eys M "ht. and two common DC Voris Id rangesl Uses MM5314 clock chip ce.,.r... ..,r.,.,r, c.a..,. 8 Digit minutes and hold functions Function Generator Kit Switches for hours, Alleeente Counter Hours 84511 y viewable to 30 feet AL Volts Ido IIZJS Yllil Provides 3 basic wavetorms Simulated walnut case 20 no 100 MHz Hange ro w ne souses sine, triangle & square wave 115 VAC operation 6 LEO Display beer,. w110 or 220V war DC Current le rangesl charger 12V sinn a , Frequency range from 1 He to 12 or 24 hour operation Crystal controlled limebas Includes all components, case and wall transformer 10111 Automatic ironer atapler and eater, 100K Rz Poloma [001vinrn r 7 2 11V power supply Output amplitude from 0 -volts to sice, brie x 31 OAu x -i- Resistance 15 rangesl MAX -100 $134.95 over 6 volts (peak to peak) Se[onamedze 75 x 7 38 JE747 $29.95 - uses a 12V supply ore t_6V split F 583 supply Dimensions Bright .300 ht. comm. lh Intl chip, P C board. compo- ode display weight 6 Power Supply 19 nents and instructions Uses MM5314 clock chip 12jdUU SInclarr AC ar . switches for hours, minutes Sockets p5 da . end hold modes ugs JE2206B $19.95 Hrs. easily viewable to 20 71. trr Simutated walnut case PDM35: Digital Multimeter . . $59.95 ACCESSORIES FOR MAX 100: 115 V AC operation '"Iple[ely assembled) CASSETTE CONTROLLER Mobile Charger Eliminator IDEAL FOR TRS 80 12 or 24 hr, operation PEW AC: 11 7V AC Adapter 6.95 , Maael 100 - CLA 93.95 ncl ell components, case & Plug; interface to any PDM-DP: Charger /Eliminator Jack sale) t6 nsformer system requiring JE701 U-. e ii Art ..f ea y an r5 6.95 4f Model 100 CAI 39.95 computer . 3 1 x 1' /a" - /8" emote control of cassette functions" Clock Kit $19.95 The CC100 controls cassette 6 -Digit REGULATED PO WER SUPPLY motor functions, monitors CONTROL 5V -1 AMP ADAPTER BOARD tape location with its internal REMOTE JE200 JE205 speaker and requires no TRANSMITTER & RECEIVER POWER SUPPLY - Adapts to JE200 - power Himinatesthe plugging tSV, *_9V end ±12V and unplugging of cables dur- *Uses LM309K ing computer loading opera. 1 Heat sink provided DC /DC converter w/ tion from cassene PC Board construction +5V input hi -speed *Provides a solid 1 amp Toriodal 63 -Key Unencoded Keyboard @ 5 volts switching XMFR Short cire. protection *Can supply up to *5V, Brd. construction ±9V and ±12V with PC JE205 Adapter Piggy -back to JE200 board el n c l u d es components, Sise:3 % "62 "x9 /16 "h hardware & instructions JE200 $14.95 *Sire: 3'4 "x5 "x2 "H JE205 $12.95 $19.95 This is a 63 -key, terminal keyboard newly manufactured by a $10.00 Min. Order - U.S. Funds Only Spec Sheets - 251! large computer manufacturer. It is unencoded with SPST Beys Calif. Residents Add 6% Sales Tax 1979 Catalog Available- Send 41t stamp unattached to any kind of PC board. A very solid molded plastic 13 Digital Stopwatch Kit Postage -Add 5% plus $1 Insurance (if desired) x 4` base suits most application. IN STOCK $Y9.95 /each

Use imterSil 7200 Chip PHONE Plated thru doublesideo P.C. Board ORDERS Hexadecimal LED display (red) WELCOME reset Unencoded Times to 59 min. 59.59 sec. with auto ameco (415) 592-8097 Quartz crystal controlled ELECTRONICS Keypad a Three Stopwatches in one: single event, split JIM J (sequential timi rig) (cu mulative)& taylor MAIL ORDER ELECTRONICS - WORLDWIDE 19 -key pad includes 1 -10 keys. Uses 3 penlite batteries 1021 HOWARD AVENUE, SAN CARLOS, CA 94070 ABCDEF and 2 optional keys and a ` Size: 4.5" x 2.15" x .90" JE900 $39.95 ADVERTISED PRICES GOOD THRU AUGUST shift key. $10.95 /each

CIRCLE NO. 32 ON FREE INFORMATION CARD AUGUST 1979 89

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 81 FREE V lleelot Breadboarding Center 1'et V DATA SHEETS! MINI -/MICRO- COMPUTER PLUGBOARDS Vector Mini -/ Mlcro'Computer Plugboards are ideal for those who want to design their own Interlace or memory boards for a wide range of computers. The boards offer the IN OUR EFFORTS TO KEEP YOU, OUR CUS- re edge'connector contacts spacing as the original manufacturers', and the 0.1" e 0.1" grid of 0.042 diameter holes will accept a wide range 01 Vector Pins and Terminals that listed below. The boards available are, Type 3662 for general purpose use, Type 4350 for TI 980 Series, Type 4607 for DEC LSI.11, PDP'S, and PDP -11 Series, Type 4608 for TOMERS, UP -TO -DATE; WE ARE HAPPY TO Intel SBC80 and National 8CL80 Series, and Series 8800 Boards for Altair 8800 and IMSAI 8080 Series. OFFER YOU FREE DATA SHEETS FOR ALL ICs

THAT WE CARRY, THESE ARE HIGH QUALITY, Plugboard Tape 3662. w 4.5" x 6.5 ". features 22 number. Type 4608 plugboards are itable for h INTEL S6C80 and National 8LC80 Series FULL -LENGTH REPRODUCTIONS OF ORIGINAL Iron, The reverse side as 21 letter , plus a grounding contact. T are Microprocessors. It has Series 80 sr and connectoror patterns: and can accomodate up to gold over pia. and are on 0.156- centers. The card lies standard 5í.e' card cages Thee "P" 54 169ín DIPS. 0042" diameter holes onn 0.100' wide variety of Vector pins an0 SHEETS. WE MANUFACTURERS' DATA Pattern plugboalyd provides maximum tlexibe,,0 in 111 layout using any Integrated circuit special r fired area is all setup to accepta 7800.5eries or 19340.5eries voltage regulator. There REQUEST, HOWEVER, THAT YOU LIMIT YOUR Package or discrete component. Pre-ppunched gods in 1/16" epoxy glass with 0042" diameter holes are et fingers, two 25/50, one 13/26, one 30/60, all on 0.1" ce.,ters, and one 43/86 on on 01" x 0.1" centers register with DIP sockets and similar components. 0.156ec s. All c e gold o plated. Thep n the board itself a REQUESTS TO ONE DATA SHEET FOR EACH ell CATALOG NO 2336620.. ... 5).65 2.,. copper of thel board is 6,15'' 12.00", and its riel Is DOLLAR WORTH OF MERCHANDISE THAT blue epoxy glass tcompo5i7e. CATALOG. NO 2346080 ...... $45.00 The 4350 plugboard is design. for m readboardrn9 of its. YOU PURCHASE FROM US. al digital circuits, and for interim assemblies with both digital and analog circuits. Ere Altair 8800 and 18501 8080 M rococo uters, Vector offers type 88000 8/4496oar8,. 74198 $1,45 74L5490$1.49 740910.$6.00 Itwillbmountedirectly roto the TI 980 series computer for mtelace circuitry. These 5.3" x 10" b pt 52 1 4 orc 15,017 DIP.. or 26 24'pin OIPs, ore combination of The 140 sleep 14- 40-pin DIPS. is 74 74,99 .165 7415670. 2.33 740914 . 1.19 plugboard has 8o etched contacts each on 0.125" centers and will mount 63 to There calso a prewired area for up to 4 power regulators in TO -220 packages. 74251 1.09 74C918. 169 OIPS 114. or 18.20ín1 over the power and ground buses. 14 more can be mount. in the side margins The board material s 1/16" k FR4 epoxy glee composite with 50/100 contacts on 0,125" il A . DIPS ers/ can z 7400 $0,15 74279 . 0.75 74S 740925, 7,80 required microprocessor 124pin, 0.6" centers which se gold o at.. DIP ordinate Inters are also provided for circuit uppermost part of the eboardealong with 45 DIPS 114 or 169ín1 i n eof the boarld and layout wiring 1 7001 0.17 74283 . 2.20 740926. 720 a. directly ompsc ling lees. Layout 80 aM a sample of wire 14 m if microprocessor DIPS 7402 .0.17 74292 . 0.89 74500 $0.35 740927..780 side required 40.pin are easily eaccomo aced by cutting one w appable terommals are supplied with each board. CATALOG NO 2388000 419.95 7403 74293 0.89 74502 035 740928.. 20 ed 0 per DIP location, The board is ai blue FRO Epoxy composite, 1 /16" Mick,thick, ands measures 7 inches wide 2-oz. 7404 0.18 74298 . 0.92 74503 0.35 by 9.6 inches long. The copper Type 8801 is the same size as Type 8800V above, except that it has one pad per hole instead 7405 .0.18 74365 067 74504 .036 e board e Tin plated a n 0041" diameter holes to accept e wide n varietyietty o n of ground and power bus runs of 13800V, CATALOG NO. 7388010.. .. $21 04 7406 ,0.24 74366 .052 74505 .036 Vector pins for ease of construction. Hole spacing is standard 0.1 inch, and contact are as are gold 7407 0.24 74367 0.62 74508 0.38 4000 50.22 over nickel plated. CATALOG NO. 23 -03500 $1809 Type 8801.1 is the same as Type 8800V above. but no pads or buses are provided. thus being 7408 .020 74368 062 74509 .0.38 4001 0 22 ideal far wire-wrapping or soldering. CATALOG NO. 2388011 .. $1822 7409 oso 74510 0.35 4002 0.22 Type 4607 plugboard NMI been designed to fit DEC L5411, POP.8, and POP -01 computers. It 7410 . 0.10 74LS 74511 . 0.38 4006 also fits Heathkit H-11 Microcomputers. The board which measures 5.19" by 8.43" is made of blue Type 08021 Is also the same as Type 68000. but it has e pad per two holes emplace of 7411 0.20 74515 0.38 4007 FR4 epoxy glass 0 -10 laminated with tin plated 20z. copper cladding. The holes are 0.042" normal ground and power buses 07 8800V, CATALOG Na 2388021 ...... $2199 7412 024 741500. 50.27 74520 ,035 4008 0,78 n 0.100 "í1,71.1s. The gold over nickel plated twin 18/36 co on 0.125" 7413 .0.25 741501.. 0.27 74522 016 4009 0.43 se Up dio 89 16 -pin DIPS and a of discrete components can be mo4411.0 on each board. Type 8804 "ANY DIP" board is optimized for wirewrappirs9 components t omes with 7414 .0.70 74L502..0.27 74530 4010 .OÁ3 Thiseboard is mainly intended for wnre.48070.ng or soldering eamponents on n, cue i.o pads or buss already pre-wired area for power regulators of 50.220 size and even a suitable heatsink is included are 7416 0,24 741503..0.27 74532 . 050 4011 0.22 provided on it. CATALOG Na 2346070.... 519.95 with the hoard. CATALOG NO 2388040 ...... $7135 7417 . 0.24 741504. . 028 74540 0.35 4012 .022

7420 0.19 741505. .0.28 74551 . 0.35 4013 .039

7423 . 0.27 741_508..0.28 74560 . 0.35 4014 . 0.95

. PINS, 7423 0.25 741509- .0.28 74564 . 0.38 4015 0.95 TERMINALS, WRAP -POSTS 7426 741510. .0.27 74555 0.38 4016 039

7426 . 0.24 741511, .0.27 74574 .058 4017 1.04 Vector Pins, Terminals, and Wrap-Posts go hand- in-hand with Plugboards and Vectorbords fora complete professional prototyping or short-run manufacturing job. We 7427 . 0.25 741S12. . 0.27 74576 4018 offer the complete line all fit into holes, and gold plating. For 7432 741513. 0.46 74578 .058 4019 039 of terminals that 0.042 diameter with tin /or your convenience, three different packages of each type are available, so do not have more what may need. . you to buy than you 7432 0,24 741514.. 0.99 74586 . 0.58 4020 1.13

7437 . 0.24 74L515..027 745112 0.58 4021 1.13

743 . 0.24 741520. .0.27 745113 4022 . 0.95 SMALL PACK MEDIUM PACK LARGE PACK MANUAL 7439 0,29 74L521..0.27 745114 0,58 4023 0,22 TYPE DESCRIPTION MATERIAL FINISH Oey/ CATALOG Price Oty/ CATALOG Price Oey/ CATALOG Price INSERTION 7440 0,19 741522, .0.27 745132 . 0.75 4024 0.79 Peek NUMBER /Peck Pad. NUMBER /Pack Pock NUMBER /Pack TOOL 7441 .088 741526. .0.32 745133 .0.38 4025 0.22 K24Á IMOrd Pine Phosphor Bronze Nickel Gold 50 2224012 82.73 250 2224014 $11.76 1000 7442 74L527..0,27 745134 .0.38 4027 . 0.39 2224016 $3723 -- 6240 Inbord Pins Phosphor Bronze Bright Tin 50 153 7443 . 069 741530,.0,27 745135 .0.49 4028 2224002 250 2224004 5.54 1000 2224006 17.84 -- 7445 741532.. 0.32 745138 .0]7 4029. 113 626A In6ord Pine Phosphor Bronze Nickel Gold 50 22-26012 2.62 250 2226014 9.56 1000 2226016 30.82 -- 526C Inboard Pins Pfwephor 7445 . 0,69 741537.. 032 745139 .1.50 4030 Bronze Bright Tin 50 2226002 099 250 2726004 3.59 1000 2226006 11.56 -- 530A Inboard Pins Phosphor Nickel Gold 50 7446 741938..032 745140 .0.47 4031 . . . 2.97 Broom 2230012 266 250 2230014 13.52 1000 22.30016 43,64 7448 . 0.62 741540. . 027 745151 .0.69 4034...235 530C Inboard Pins Phosphor Bronze Bright Tin 50 2230002 135 2501 22-30000 5.32 1000 2230306 17.19 -- 7448 74L542. . O.68 745153 .0.75 4035...0.99 K31Á Inboard Pins Phosphor Bronze Nickel Gold 50 22 -31012 2.06 250 2231014 7,49 1000 2231016 24,14 - 7450 . 0.19 74LS47. .0.7S 745157 .0,75 4040 ...099 K31C In6Ord Pins Phosphor Bronze Bright Tin 50 22-31002 1.11 250 22.31004 4,03 1000 2211006 12.99

. - 7451 0.19 741_548.. 076 74515B .0.75 4041 . . 0.78 532 Wrep-Poet "J" Pins Phosphor Bronze Bright Tin 100 2232003 1.79 500 2232005 6.06 1000 2232006 11.16 -- 7454 . 0.19 74L551 . 027 745174 .1.50 4042 .0313 532-2 Wrep-Post "J" Pins Phosphor Bronze Bright Tin 100 2232203 2.70 500 22-31205 10.14 1000 7232206 16.90 7454 .0,19 741554... 0.27 745175 .1 45 4043...069 5323 Wrap-Post "J" Pins Phosphor Bronze Bright Tin 100 2231303 2.18 500 2232305 8,17 1000 2232306 13.61 -- 7460 .0.19 741555. . 477 745189 .2,75 4044 538A Inbord Pins Phosphor Bronze Nickel Gold 50 2238012 3.18 250 2238014 11.59 1000 77-38016 3737 -- 7460 0.19 74L573..0.38 745194 .135 4046 .1,79 1(38C Inboard Pins Phosphor Bronze Brian' Tin 50 2238002 1.85 250 2230004 6.74 1000 2238006 21.73 -- 7470 0,25 241570 .038 745200 .3.25 4047 ..1.99 832 Socket Pins Berylium Copper Gold 25 2232911 5.90 100 2232913 2160 1000 22.32916 173.56 7473 741576. . 0.38 745706 .3.75 4048 095 R41 Socket Pins Bar hum Copper Gold 50 22 -01012 2.11 250 22 -01014 10.17 1000 2241016 32.78 P162 7474 741578. .0.38 745253 .0.95 4049...0.39 7421 Micro-Klip Terminals Copper Alloy Bright Tin 100 2242103 1.54 500 2242105 6.77 1000 2242106 11.28 P149 or P149Á 7474 0,29 741583. . 745257 . . . 0,78 .1.15 4050 0.39 744 Bifurcated Wrap -Post Copper Alloy Tintillete 100 22-04003 234 500 2244005 8.61 1000 2244006 14.35 A13 7476 . 741.585. 0.97 745258 . . .1.15 4051 1.19 T44 -1 Bifurcated Wrep -Post Copper Alloy Nickel Gold 100 2244113 359 500 7244115 14.76 1000 7244116 24.60 A13 7476 . 0.31 74L586.-0 38 745280 .2.25 4052 T46 Double WrapBpn Pins Phosphor Bronze Tintillete 100 2246003 358 500 2246005 15.63 1000 2246006 26.05 P133Á . 7482 0.49 741590..0.56 745287 . . .3.20 4053 1.19 T46.1 Double Wrap-Post Pins Phosphor Bronze Nickel Gold 100 2246113 860 500 22-06115 2762 1000 2246116 46.36 P133Á 7482 . 0.55 741592. 0.56 745289 .3.55 4060 ...169 T46 -2 -9 Double Wrap'ost Pins Phosphor Bronze Bright Tin 100 2246203 2.62 500 2746205 11.94 1000 2246206 19.89 P1336 7483 0,59 741593.. 0.56 745300 .1.60 4066 . . . 0.78 T4620'9 Double Wrap.Post Pins Phosphor Bronze Nickel Gold 100 2246213 4.29 500 2246215 20.68 1000 2246216 34.86 P1336 7485 0.79 . 741595.. 0.87 745305 4068 . 029 T46 -38 Double Wrap-Post Pins Phosphor 100 7489 Bronze Bright Tin 2246303 2.74 500 2246305 12.54 1000 2246306 20,90 P1336 .0.27 7415107. 018 745310 .2 85 4069 . . .026 T463Á9 Double Wrap-Post Pins Phosphor 7490 135 74LS109. Bronze Nickel Gold 100 2246313 4,92 500 2246315 25.44 1000 2246316 4240 P1336 0.38 745312 .1.05 4070 . 049 14640 Double Wrep.POS1 Pins Phosphor ISO 7490 Crones Bright Tin 2246403 2.06 500 22-06405 10.15 1000 2246406 1691 P1338 0.43 . . 74L5112.0.38 745313 .1 55 4071 0,22 T46-0A9 Double 7492 Wrp -Post Pins Phosphor Bronze Nickel Gold 100 2246413 4400 500 2246415 20,30 1000 22-06416 3363 P1336 74L5113.0.38 745316 .2 80 4073 . . . 0,22 546-5-9 Double Wrap -Post Pins Phosphor Bronze Bright Tin 100 2246503 358 500 2146505 17.36 1000 2246506 2293 P1336 7492 . 0,43 7415114.018 745341 .4.10 4075 .022 746óA-9 Double Wrap-Post Pins Phosphor Bronze Nickel Gold 100 2246513 5.97 500 2146515 1000 7494 0.43 741-5123. 0.98 745342 .1 20 4076 .. .1.29 31.16 2246516 51.93 P133e 74668 Double Wrap'POst Pins Phosphor Bronze Bright Tin 100 2246603 3.54 500 2246605 17.13 1000 22-06606 28,54 P1338 7495 . 0.65 74L5125.0.48 745343 .4.95 4077 .0.59 .. 7466Á9 Double Wrap-Post Pins Phosphor Bronze Nickel Gold 100 2246613 7495 0.65 7415126, 0.48 745346 .1.25 4078 .039 5.69 500 2346615 29.89 1000 2346616 49.81 P1336 549 Trifurcated 611800ap Pons Phosphor Bronze Bright Tin 100 2249003 3.76 500 2249005 13.74 1000 7496 . 0.65 7415132. 0.80 745362 .2.15 4081 ..022 2249006 2190 P156 Ta9A Trifurcated Klipwrp Posts Phosphor Bronze Nickel Gold 100 2249013 7,77 500 2349015 3341 1000 2249016 56,56 P156 7497 2,45 74L5133.0.38 745387 . 430 4085 0.69 74109 T49 -I Trifurcated Klipserap Pons Phosphor Bronze Bright Tin 100 2249103 362 500 22-09105 17,04 1000 3249106 2240 P156 7415136. 0.38 4086 . 069 549A -1 Trifurcated Klipwrep Poses Phosphor Bronze Nickel Gold 100 74109 . 2249113 6.25 500 2249115 31 00 1000 2249116 61.85 P156 0,32 74L5138.093 74C 4089 . 1.75 74122 .034 7415139. 093 4093...0.99 T50 F.ed'Tnru Pins Phosphor Bronze Bright Tin 100 2260003 2.00 500 22.50005 720 1000 2260006 12.49 P1338 768 61100520 Posts 74122 . 0.39 7415151 0.74 74C00 50.74 4099...2.10 Bifurcated Copper Alloy Tustillate 100 22.8003 267 500 2268005 944 1000 2268006 16.40 A131 768.1 Bifurcated Klipsvrap Posts Copper Alloy Nickel Gold 100 74123 0.49 7415152. 0.70 74002 . 024 4104 2.20 2268013 484 500 2288015 1937 1000 2268016 32.27 A131 74126 .0.39 7415153, 084 74004 .0.26 4503 T68A Bifurcated Klipwrap Posts Copper Alloy Tintillete 100 2268903 234 500 7268905 861 1000 2268906 14.35 A13.1 T6138'1 Bifurcated Klipwrep Posts 74126 . 0,39 7415154 1,09 74C08 0 25 4507 099 Copper Alloy Nickel Gold 100 2268913 399 500 2268915 15.58 1000 2268916 2596 A13 -1

74132 . 0.65 74L5155.0,74 74C10 .024 4510 . 1.13

. 7445 0.79 74L5156.0.74 74014 090 4511 . 1.04 MANUAL INSERTION TOOLS

741,45 069 7015157. 0.74 74C20 . 075 4512 . - . 0,98 74148 1.60 74L5158. Type A13, CATALOG NO 23 -01130. Type P1338, 0.74 74030 .024 4516 . . 122 5294 CATALOG Na 2381332 53.03 Type P156, CATALOG NO 2381560 5052 74148 74LS160. 1.01 74C32 . 0,25 4518 1.13 Type A131, CATALOG NO. 7301131. SO 15 Type P149, CATALOG NO 2381490 .. $2.13 Type P162, CATALOG NO. 7381620... 52.13 74150 .0.89 74L5161.101 74C42 4519 .0.62 Type P133Á, CATALOG NO. 2381331 5289 Type 8149A, CATALOG NO, 2381491 ... $2.61 74151 , 0,59 74L5162.101 74048 .127 4520 74152 .0.59 7415163. 1.01 74C73 .031 4527...167

74153 .059 7415164. 1,01 74074 048 4528 . . 0,86 74155 "P" PATTERN MICRO- VECTORBORDS" 70415168.1.13 74076 011 4532 . 0.86 74155 0.69 7415169. 1.13 74C83 .1.37 4539. .1.10

74156 . 0.69 7415170, 1,72 74085 .1.37 4555 . 067 "P" pattern Micro- Vectorbord with 0.042" diameter holes On 0.1" grid, especially useful tot quickly n t mg DIP integrated c uits, m roprocessors, memory 74157 74L5173. 113 140.86 .0.49 4556 0.88 blocks, transistors, r slstor'capacitor blacks, terminals, Band a multitude of available accessory devices having tabs oOil 0. 1" x 0.1" grids. All this without having to punch or 74158 7415174. 1.05 74089 . 195 4582 .. .028 drill holes. The boards may be easily lines, 74160 .0.87 74L5175.0.83 74090 .027 4584 broken off along hale sheared or sawed. I.C.C. offers a wide variety of boards with base materials ranging from economical phenolic to glass. All s 74162 .0.87 74L5181 . 2.50 74C93 .0.97 4702 ..J.10 super strong epoxy boards listed below have a thickness of 1/16 ". 74162 .0.87 7415190. 1.17 74C95 109 4703 ..525 74163 .087 74L5191 . 1.17 74C107 .0.G9 4704 .7.30 PHENOLIC 74164 .0.87 EPDXY PAPER 7415192.027 74C151 .1.89 4705 ..9.25 Type 64P44X XX P. 4 50" x 6 50 CATALOG NO. 23 51,56 Both 74166 Sides Copper Clef. .0.87 7415193.0,97 740154 .2.90 4706 . 9.75 84P44XXXP, 4.50" x 8.50 ", CATALOG NO. 2384443 51 83 Type 64P44EPC2, 4 50" x 6.50', CATALOG NO 2364446. 52 84 74166 1.20 7415194. o.80 740157 .1.89 4707 Type x 9.25 1691544XX XP, 450" 17.00", CATALOG NO 23.69443 53.63 Type 66P44EPC2, 4 50" x 8.50", CATALOG NO. 2384446 74170 .195 74L5195.087 5350 74C160 .1.17 0708 1415 x 17 , Type 169P59XXXP, 6.00" 00' CATALOG NO 2389593. 5494 Type 169P44EPC2, 4 50" x 1700 ", CATALOG NO 2369446 5698 74170 1,55 74L5196.0.85 74C161 4710 .660 741,73 1.20 74L5197.085 140162 .1,17 4720 ..6.95 TRANSPARENT LEXAN EPDXY GLASS 74175 . 0.88 7415221 1,90 740163 1.17 4723...0.93 Type 79P44T, 4 50" x 608", CATALOG NO. 23 -79442 6380 Type 64P44WE 4,50" a 6.50" CATALOG NO 2364447 6207 74175 . 0.78 74L5251.099 74C164 .i 09 4724 ..1.29 Type 048449E, 420" e 8.50 ". CATALOG NO 74176 2384447 52 56 .078 7415253. 0,99 740165 109 4725 . .3.95 EPDXY PAPER Tope 169P44WE. 4,50" a 1700-, CATALOG NO 2349447 5504 74171 . 0.78 7415257 0.74 140173, 1.29 40014 ..090 Type 64P44EP, 450" x 6.50 , CATALOG NO. 23-64444 5205 Type 169P79W E. 8.00" . 17.00", CATALOG NO 23.69797 74119 1.60 7415258. 0.74 74C174. 1.15 S7 98 400135 1.37 Type 84P44EP, 4 50" x 8 50", CATALOG NO 2384444 52 Type 169P84*E. a 74180 55 8.50' 1700". CATALOG NO 2369841 59.03 ,180 7415259. 1.81 740115..1.15 40097 ..0.54 Type 138P42EP, 4.50" a 1390 ", CATALOG NO. 23 -38424 54.32 74180 0.69 74LS260.0.54 740192 1.37 40098 a54 Type 169P44EP 4.50" 17.00 ", CATALOG NO. 23-69444 5464 EPDXY GLASS 74181 .195 74L5266. 0.38 740193. 1.37 40106 0.90 Type 169P47EP 4.80" a 17.00", CATALOG NO. 2369474 5483 One Side Copper Ci4dded 74184 . 0.78 74L5219,0.58 140195. 1.08 40160 .117 Type 169PBOEP, B 50" x 11.0!1", CATALOG NO. 2369844 58.23 Type 84P44LVEC1 450" I 850" CATALOG NO 2364448 $3 40 74185 . 1.95 7418283. 039 74C200..7.50 40161 117 Type 169P44WEC1, a 50" x 1700" CATALOG NO 7369448 5680 74185 .195 74E5290 064 74C221. 129 40162 117 EPDXY PAPER Type 169P84WECI, 8.50' x 17 DO" CATALOG NO. 2369848. Sit 87 74198 . 3.25 74L5295. 0.99 140901..048 40163 . 1.17 One Side Capper Clamed 74190 74152913. ,0.95 0.99 74C902..0.48 40174 115 Type 64P44EPC1, 4 50" I 650 ", CATALOG NO. 2364445. 5266 EPDXY GLASS COMPOSITION 74192 0.95 7415365. 0.66 740903..0 59 40175 1,15 x Type 84P44EP01, 4 50" 8 50", CATALOG NO. 2384445.. . 93.7> 11 Etch.Etc ed Ana Tinned Pads Per Hole O Both Sides 74192 . 0,80 7415366. 026 740904 0.59 40192 137 Type 169P44EPC1, 4.50" x 1700". CATALOG NO. 2369445. 56.51 Type 45880 I, 4 50 81)8" NO 2345801 510 46 93 . 0.80 7415367. 066 74C905..6,00 40193 137 1068106 i, 1060" a 10.60", CATALOG NO 74194 505 2306061 519.94 .0.87 7415368. 066 140906. 059 40194 . I I?8 OOn 96 .087 74L5386. 0.38 740907. 0.59 0195 1 08

74196 .0,87 74L5390,1,69 740908. . 1.19 THE ENTIRE LINE OF VECTOR'S MANUAL, BATTERY, AND A C OPERATED SLIT -N -WRAP TOOLS AND ALL ASSOCIATED ACCESSORIES; 74197 0.87 7418393. /29 7 C909. 1 313 IN ADDITION TO A COMPLETE LINE OF O.K. WIRE -WRAPPING COMPONENTS ARE IN STOCK FOR IMMEDIATE DELIVERY.

VOLUME DISCOUNT SCHEDULE STANDARD SHIPPING CHARGES SPECIAL SHIPPING CHARGES INTERNATIONAL COMPONENTS Merchandise Total DISCOUNT If your Merchandise Total is between: For following special services, please include: CORPORATION S 0.00 -$ 999 NET S 0.00 -$ 4.99 add $2.00 COD 3100 additional S 10.00 -$ 24.'99 LESS5% 5 5.00 -$24.99 add $1,00 UPS Blue $2 00 additional $ 25.00-S 99.99 LESS 10% $ 25.00 -$4999 add $0 75 Postal Insurance S700 additional P. O. BOX 1837 S 100.00-$499.99 LESS 15% $ 50.00 -$99.99 add $0.50 Special Delivery S 125 additional S 500.00- $999.99 LESS 20% $100.00 and Up NO CHARGE COLUMBIA, MO 65205 $1000,00 and Up LESS 25% The above charges include your choice of VISA shipping in U.S. via First Class Mail or UPS PHONE: (314) 474 -9485

CIRCLE NO. 300N FREE INFORMATION CARD 90 POPULAR ELECTRONICS

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 82 G5 CONTINENTAL SPE I HICKOK 31/2 Digit S E IICCRE 100 MHz 8 -Digit Counter $119.00 -11= Mini -Multimeter TV- VTR -MATV and Video Analyzer 100 rrIV DC F S S c. PS500 500MHZ Prescaler $52.95 195 gr .r' II ,.. PRfC/SION Digital I / CODE-A- PHONE5BSR Changer 700 H 'JJJJ/,, Capacitance Meter Answering Accessories il 3494^110%M44411 Devices ,S29.95

d Ungar Inde' 1400 $199.95 Heat Gun "r 9 P " / $46.50 )O 3 -Way i Speaker 7800 1 Mode12B10 IW I+ w Logic $110.50 it Monitor=ies= $27.95 1 l J 1 í r $14.95 ^. dl 7500 C 0dle s 15 MHz Mini ql glmr01795 PEcls10 15MHz ,agi. g

1 $52.95, Oscilloscope M ndvi LM I, u S22.50 3" Dual Portable Model MS 15 Attache Style 1Service Master \ I-11CKOK Trace Cases Tool Kit Tool 9 Attach '>.h . Scope OC 10051 .. MOOT, $269.95 Model 995M Roll Kit Tool .- $42.95 $269.95 $15.95 Case'4-,24 Power renscrrennn iess:Iran I NOW AVAILABLE with 2 B uell race Venin' $369.95 Removable Pallet 215 Rerl Model MS Moode1600T 589 nn $65.00tDU ZC 20 MHz. Controlled $45.00 Dual Trace Mode í LP 1 Logic Probe In-Dash - - Output ModelWlCPN AM /FM 8 Track Sub- Soldering _." $40.00 $654.50 Stereo stitution Station FREE 111.__,,1 Box $51 1979 SEIVCORE Magnifier '4=-700 Series $52.50 Wide! 2910 hock 5E5 pure Catalog POCKET CRICKET LAMP l Call TOLL FREE TRANSISTOR /FET TESTER 00 MUA.I MG 10A' T,.`fI; Reg 5175 $99.95 -_ 30MHz (800) 645-518 516i Mn slerCharge nkAmeticard 40 TF I Portable COD Check Money Order Add 5-I 5 i, ' 17a Auto Stereo 40 Watt Frequenc Power Booster áßi Counter II "'$24.95 POW -40 with mirrored icele 1K ohm v 9.95 FoROxAM

CIRCLE NO. 22 ON FREE INFORMATION CARD

Full Wave B s DIP SOCKE fS PRINTED CIRCUIT BOARD TRANSISTOR SPECIALS F, IOS 'DIODe CL AMPLDI tnJ'.ylrrl',Ilrlr, rk i1 01:IV 4 D1511111. F GI DF ERG . 511 8004 a CB BF Transistor NPN 5 1001 HOARD 1'16" rhirk S 1 011 5 60 e:1 2001 ., 1,5 1(3 I S IS r 7 WATT LD -65 LASER DIODE IR $8.95 400' 4 600- ''IPI 111 SANKEN AUDIO POWER AMPS

3,5 1 n

50 TANTULUM CAPACITORS

6'S 1 00 .7711E , 1 n'1 04if ' l'.1'3I Í0 AS 1 00 47UF 3'. .1 00 10011 10V S 25 68UF ', -00 7211F 25V 3 40 141F 35V 5 S1 00 1571F 30V 3'51 00 2 TUF 20V 5151 .00 30UF 6V 5151 SO 1'C VERIPAZ 130411U 13 NON Si 4'S 1 N1PSA 00 3 30F 20V 4,01 00 15041F 15V S 95 a.7UF 15V .5.'31.00 47UF 70V 5.35 68UF 15V 5.50 IC TTL SERIES IS SERIES LINEAR CIRCUIIS 444 2(71 7E, 0 738 .u +c u. LM11 F TRANS 5 SO ae7 0 Joe REO OF GREEN M 131t LED's 2" .6151 00 LARGE M 31e TIL118 OPTO ISOLATOR S 75 L M 124 9 MCT 6 OPTO ISOLATOR S 80 1E4 E 1 WATT 2ENER5 33,47 51,56,91

10, 17, 15. 18, or 22V 6/01 00 1 5 MCM 6571 A 7 x 9 character gen S 10 75 UNIVERSAL 4Kx8 MEMORY BOARD KIT 569.95 32.21021 fully buffered, 16 address board decoding for any 4 of 64 pages. s rr 44 pin buss, rmay be .sed with F 8 5 K15' 25C Silicon Power Rectifiers

m, 65 15 n oLS s45.:,3 2.000 MHz 6.144 MHz 4.000 MHz 5.000 MHz 3.57 MHz 10.000 MHz MHz 5.000 MHz 20 000 _ . 1 , 41: 1024 a RF, v...rnr 6.000 MHz .garle snIll reset., SI 14 p,o I aie 3/51.00 15151 nn I N 4148 1159141 4561 .1 ul 25V ceramic cap ' O SI 00, 55 00'105 S5 185E 206-8 eight position dip switch .. . - 31 on 73,174, 95 CTS CLOCK CHIPS gnr3 =n 51 4F 57 50 CTS 206-4 four position dip switch RS232 S7 p 1710380C 1(r0 Sg1i19 53.75 LIGHT ACTIVATED SCR's to 18. 255,V 1A S .7i' CONNECTORS $7 50 IEEI SILICON SOLAR CELLS NO 30 WIRE WRAP WIRE SINGLE 4" diameter .4V at 1 AMP $100i REGULATORS STRAND IOU S1 40

323K 5V 3A .5 5 15 340 K- 12. 15 PRVI 14 IOA 754 1.5A 1 SA ,554 FND 359 CC 4' S 60 LED READOUTS S 309K 5 1 60 or 24 V, S I ' 100 48 84 1 16G 48 GO '!4 1 CS 8024 4 DL 704 C A. 3" 75

g' . 723 340T ' 1..32 2 10 2 L0 C 8' ,151riybF CI 747 r A r 51.50 S 50 5,6,8,12 200 84 72 84 MTA 2060 OPO1 CENTER OFF $ 1.H5 t 15, 18 nr 1 4" t 320T- E FND c c 11P3400.8"CC 24VS 7 503 5' S1.95 400' 1.32 11 92 3 12 1 20 44 a4 MSD 206 P DODT CENTER OFF FND 510 C A 'r n HP3405.8"CA 51 95 5. 12. or 15 V 78 51G S 1 :- rrVFU tin S 185 60(V2041276 432 I t 80 3 50 5 140 ,n A.+(, S

WE SHIP OVER 95% TINTMC FOS CMIOIIAyfa, Mass. Send 254 for our utalog featuring SOLID STATE SALES Send Cheek or McnsyOle . Transistors and Rectifiers OF OUR ORDERS THE P.O. BOX 74A Include Poe 145 Hampshire St., Cambridge, Maas. DAY WE RECEIVE THEM OnMrf6.00r 110.00 SOME R V I LLE, MASS. 02143 TEL. (6171 547-7053

CIRCLE NO. 48 ON FREE INFORMATION CARD

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 83 1802 SERIES PERSONAL FUNCTION GENERATOR KIT For Learning, Designing, Work or Just Plain Fun. . PET2001L COMPUTER 1822LE sá005 1á5áh Sl.lo 1952LE 3.56 1957LE 1.10 XR2206KB a, d Quite portable, very affordable and un- 1852LE 0 1859LE 1.45 1853LE 145 195aLE 145 oPERAT,sory E Rockwell ss believably versatile, the PET computer SINGLE I2V SUPPLY p SP4TSUPPL may very well be a invest - lifetime p 038CP INCLUDES' ALL PARTS i !',. A'` -,a To eE >4ourvTED merit Function Generator IC ory i AIM 65 ac eognD E The Heed in $3.90 each Start Computers - 2001 4K bytes memory ;595 J7J 20-Column 2001 -0 Computer 8K bytes with integral cassette BK 19.95 and calculator r- E O -. Dot Matronlx Alphanumeric type keyboard.... E 795.00 2708 EPROM PowER su UPLy 2001 -16N ->wep Printert Display Computer rd. by tea, large k.. .. w/. . . . to $10.50 ea or 10 for 58.90 ea NOT Incl_vo50- ._ ii pee and graphicsAs bn keys.. $n995.00 Terminal Style Keyboard 2001-168 Computer As boye but aeoáe.é iypevyrro.. keyboard. -`r No graphics $ 995 00 KIM -1 MICROCOMPUTER A65 -100 1 K DOCUMENTATION (Furnished 2001 -32N Computer Identical to 2001 -16N except Static RAM $375.00 has 321 bytes tM1 AIM 100 or i The 65 400 memory 21195 00 A65 400 Stone RAM 480 00 car) Includes 2001 -32B AlrNgr SummtorSummary Computer Identical to 2001 168 except has 321 bytes j p C mplO- A65 -010 Assembler ROM 85.00 Card, and Program of memory .5719500 Monitor .... le i; MICRO- Assembled A65 Listing and user: coda and 2021 Printer 80 column dot matrix electrostatic printer, full . l -020 BASIC Interpreter Ms `" ' Computer g Tested a 86500 Programmer Rea Card, Man graphics capability ...... 5 549.00 _ - on two ROMs 100.00 ual and Hardware . J Manual. $20.00 2022 for, sr column dot matrix printerrar its plain paper System yt forms tractor teed, has full graphics ... .E 995.00 .. 2023 Printer 80 column dot mama printer, plain paper Printer $269.00 E779 - DIGITAL with full graphics E 849.00 Including HICKOK MULTIMETER 2040 Floppy Disk Dual drive intelligent IV 303 mini floppy system. KTM -2 CRT /TV Kyhd Term 5349 Documentation- Compact. Accurate. Dependable. With easy -to- 343K net r storage $1295.00 read '/a" liquid crystal display for convenient 2041 Floppy Disk Single drive intelligent mini floppy with 171.5K in any kind of light. Weighs only ces net user Storage $ 595.00 !FLUKE! STANDARD MICROSYSTEMS operates up to 200 has on a single 9 volt battery. C2N External Cassette Cassette player o use /recorder t with COM 6402 $18.00 Nineteen ranges including 200mV To 1000VDC, PET 20anual E 95.00 COM 6402P a.00 100 to nd and 1000 AC ranges, MANUAL User Manual 160 page coveringova' all facets of useru operation, and IOmA ranges.r anew. Excellent overload pro programming and I/O for PET COM 801] 15.00 r_ computers $ 9.95 COM BO17P S.JO 1025660N 3.52 COM 1671 42.00 00M 5025 30.00 CRT 5027 50.00 SI- 1050G150W1 $27.80 TR50 $17.90 X8215 4.40 XR2202CP 1.33 XR2211CN 6.21 XR2556CP 3.20 COM 2017 15.00 COM 5025P 28.p0 CRT 5027P 42.00 XR320P 1.52 X822030, 1.33 X02211CP 5.25 XR2567CN 3.71 COM 2017P 5.70 COM 5026 11.00 CRT 5037 50.00 q- SI- 101Socket for above) .95 XR346CP 2.70 X92204CP 1.33 XR2212CP 4.37 X825670, 2.76 COM 2017H 15.00 COM 5026P 10.50 CRT 5037P 42.00 Note: One Transformer can power two audio amplifiers. XR555CP .90 XR2206CN 5.36 XR2216CN 6.40 X03403CP 1.22 COM 2017HP 5.70 COM 5026T 10.70 CRT 7004A 19.80 1.50 XRF2 206KB 19.95 X/R2240CN 3.66 XR556CPP %R4136CN 11.61 COM 2502P 18.00 COM 50367, 13.20 CRT 70040 16.20 5 /0 CARBON FILM m' Watt X R567cN 1.51 //t Dj XR4136CP 1.22 COM 2502H 15.00 COM 5036P 12.70 CRT8002A 35.00 $1.69Per 100 1.31 XR415ICP 2.85 COM XR1310EP 1.31 XR4194CN 3.81 COM 2601 30.00 COM 5036TP 12.40 CCRT T 80020 25.00 XR1458CP .86 XR22065 11.20 L/0000-s2`2,40CP P ( 844 XR4195CP 1.42 COM 2601P 29.00 CO M 50467 11.00 F 3400P 14.00 too XR1468CN 3.84 XR2207CN 4.28 XR2240N 6.24 004212CP 2.05 COM 5016 13.20 COM 5046P 10.50 KR RESISTORS $179,.. 2376ST 20.00 XR1488N 1.42 X02207CP 3.32 XR2242CN 1.68 XR4558CN .98 COM 5016P 12.70 COM 5046T 10.70 KR 2376ST, 12.00 All vulu.> Iron) 101. tip 10ML1 - Only ui mu, r r/,li's i,I 100 pieces per value XR1488P 1.31 XR2207N 5.25 XR2242CP 1.50 004558CP .75 COM 5016T 12.90 COM 5046TP 10.20 KR 3600ST 20.00 X R1489AN 1.42 XR2207P 4.28 XR2264CP 4.24 XR4739CN 1.53 X 81489ÁP 1.31 XR2208CN 5.60 X822650, 4.90 %847390, 1.12 PORTABLE, ,i,1 5000Money c,,.co nR2200CP 1.17 ., XR2208CP 5.20 X822710, 1.15 XR4741CP 1.47 I NA RIC A MINISCOPETRACE 30 +.tLUAMEGAHERTZ UED ( P.O. Box 2208P, Culver Coy, CA 90230. California resi- +'y`C' dents add 6% sales tax. Minimum Order $1000. Add Intersll LED or LCD 3D MEGAHERTZ $1.00 t r postagex and handling. Master Charge and 1 MS -230 u , $559.00 Visa welcomed Please . include your charge card number, Interbank 3 /2 DIGITG I number and expiration date. T PANEL ' a 5 MEGAHERTZ PHONE ORDERS (213) 641-4064 MS- 215 $435.00 $s 0,1.. METER KITS % S Y 11 Mns -15 Startle 5319.00 TUCSON CULVER CITY SANTA ANA PORTLAND BUILD A WORKING DPM IN I /2HOUR WITH - StEL Broadway oaas ter.o "e. range 25n Aaa ! ' e,.n, rn.raa, 4 t Po150311 THESE COMPLETE EVALUATION KITS ] - ' - 710071 681-2146 eu 17131 .390359570 17141nä547.2405 254.5541 parts OPTIONS captor.,06art, c P e,e with nrPI.Tt"e1i' d - C. Bur e> ° PrOhPaa' < , PORTABLE Fe w 41 140 sas.00 "AMA' SUNNYVALE ATLANTA HOUSTON as tic ua rip PC me.e. 5^ ,. wotosiun BPane M6230 tO 524.50 i- at Cen.o ov.d.nogdh 3689 n.n,.,dnn ICL71OBEy ICLr10> 5,riers n. 13.1 o,ve w.t.s o et red me. n 545.00 pE (LOD) $29.95 (LED) $24.95 t,,. 16811 324707 514091 243dM7 A14,41 M171005 ~r..ev,52434e9a CIRCLE NO. 8ON FREE INFORMATION CARD

MILITARY TIME FORMAT. FAIRCHILD RED LED LAMPS NATIONAL SEMICONDUCTOR MA1008D 4FLV5057 Medium Size Clear Case. RED EMITTING These are not BRAND NEW! retested off -spec units as sold by some of our competition These are JUMBO CLOCK MODULE factory prime. first quality, new units

10 FOR $119 EATURES s 4 9 5 FOUR JUMBO . INCH LED DISPLAYS 50 FOR $495 24 HR REAL TIME FCRMAT 24 1-IR ALARM SIGNAL OUTPUT "WE BOUGHT 250,000 PCS." $795 50 OR 60 Hz OPERATION LED BRIGHTNESS CONTROL "THE COLOSSUS" POWER FAILURE INDICATOR REG. 19.95 SLEEP 8 SNOOZE TIMERS FAIRCHILD SUPER JUMBO LED READOUT DIRECT LED DRIVE LOW 0FII A full .80 inch character. The biggest readout we have ADD $1.95 FOR COMES WI To FULL DATA AC XFMR ever sold! Super efficient. Compare at up to $2.95 each COMPARE AT UP TO TWICE from others! YOUR CHOICE S1 49 OUR PRICE! FND 847 Common Anode EA ZULU PERFECT FOR USE FND 850 Common Cathode (6 for $6.95) 50% OFF SALE! WITH A TIMERASE. MANUFACTURER'S CLOSEOUT! 16K DYNAMIC RAM CHIP EXPERIMENTER'S CRYSTAL TOSHIBA POWER AUDIO AMP 5.8 WORKS IN TRS -80 OR APPLE II 262. 144KHZ This frequency Is 2 Watt RMS Typical Output. 50 to 16K X 1 Bits 16 Pin Package Same as Mostek 4116 -4 250 NS access 410 NS cycle to the 18th power Easley divided 30,000 HZ ± 3 DB. For CB's. tape time Our best price yet for this state of the art RAM 32K and 64K RAM boards down to any power of 2, and even decks, PA's, etc. Works off of asingle using this chip are readily available These are new. fully guaranteed devices by a to 1HZ New by CTS- Knight As5 supply voltage from 10.5 to 18 VDC. major mfg VERY LIMITED value. STOCK! 10 plastic $1.25 each Pin DIP with special built in "MAGAZINE SPECIAL" 8 For $79.50 heat sink tab. Perfect for use on - 4.00 MHZ - $1.75 12VDC. With Data G.I. FULL FAIRCHILD PNP MOTOROLA POWER COMPLEMENTARY POWER TRANSISTORS "SUPER TRANSISTOR" WAVE BRIDGE TR IAC 2N4402 TO92 Plashv Silicon PNP SILICON NPN AND PNP. TO -220 CASE. Driver High VCEO 4 AMP 600 PIV Cunene -40 '(FE -50 TO -220 CASE VCEO - 40V PD - 30 WATTS to 150 at 150 MA FT-150 MHZ A super 3/4 In. FOR AUDIO POWER AMPS. ETC BEEFED -UP Vernon of the Square 15 AMP 400 PRV 2N3906 SPECIAL With Lugs, #LM -1 894 TIP29 - NPN YOUR CHOICE 8 FOR S1 each 750 ea. 3 For $2 5 FOR $3.95 TIP30 - PNP 3 FOR $1 FET SALE! EXPERIMENTER'S HEATING PLATE ANNOUNCEMENT: 2N4304. Brand New Large Manufacturers Surplus. 51/2x10'.- In Made of 3/8 in To better serve our customers we are splitting Digital Research Corp of N Channel. Junction Fet tempered glass with heating element laminated on back. Works Texas into two operating sections: PARTS AND COMPUTERS We feel this BVGDO-30V IDSS -15 MA Typ. off 120 VAC. Protected by thermostat and two thermal fuses. change will allow unto offer you lower prices. better service. and many more 1500 uMHOS TO -18 Plastic Rated 120 Watts. Use for any heating applications. Perfect for new products Continue to order parts. clock modules. etc from DR P PO Case Mfg by Teledyne heating ferric chloride to increase PC board etching efficiency. Box 401247 Garland. TX 75040. To order computer parts and computer kits order from 6 FOR $1 Units are brand new, non -submersible Digital Research Computers P O. Box 401565 Garland, TX WHILE THEY LAST - $2.99 each 75040 TERMS: Add 50C postage, we pay balance, Orders under $15 add 75C handling. No C.O.D. We accept Visa, Master - Digital Research: Parts char9e, and American Express cards. Tex. (OF TEXAS) Res. add 5% Tax. Foreign orders (except Canada) add 20% P á H. 90 Day P. O. BOX 401247 GARLAND, TEXAS 75040 (214) 271 -2461 I Money Back Guarantee on all items.

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Huntington Beach, CA 92646. 80011. service manual, parts list and schematic. Mike Christodolou, 18 Lei Dr., Lexington Park. MD 20653. Heathkit receiver model AR -3. Schematic and assembly Hallicrafters model S -120 shortwave radio. Need operation alignment manual. David Carpenter, 2717 E. 4th Scott serial #1052 manne radio. Need St., Tuc- manual. Sean A. Devitt, 2237 Wharton Rd , Glenside. PA service manual and son, AZ 85716. 19038, schematic. Frank B. Hawley, 253 West Rock Ave., New Haven. CT 06$15. B &K model 650 tube tester with model 610 and model Bell model T -337 tape recorder. Operation manual and infor- TC -615 adapter panels. Tube test set -up chart needed. Larry mation on parts. Don Lachey, 80 N. Frankfort St., Minster. Stromberg -Carlson Ob., Ltd., type 5788 oscilloscope. Delahooke, Box 7423, Rochester, NY 14615. OH 45865. Need any information. John Greenland, Box 138, Kelligrews, Newfoundland, AOA 270. Jerrold 900B sweep generator. Operation and service man- Webco model, EP2302 -1 tape recorder. Need oscillator coil. Accurate Instrument Co., model 154 VOM Need schematic. Lee W. Hannahs. 4544 Barden Rd., Coleman, MI 48618. TOWNE DUMPE -VISIT OUR NEWEST STORE @WOOLCO PLAZA,MANCHESTER,N.H. r. o_ W $138.88 Brand-Name Speaker Kits Hickok model 550X mutual conductance multi- tester. Tube pair More in oNr free catalog. chart and manual. Mike Galinsxi, 645 Lindsay St.. St. Lau- 5 Another kit fit for full rent, Quebec, Can H4L 2R1. z ALARM STUFF New PKG Stufft o sound reprg: 3 -way Ult -Sonic Mot. Det. 8030336 $49.50 F "Bookshelf" system. 10" 4 Touch Switch AI 8MI0475 - $6.88 Radio Shack model EC421 calculator. Need operation in- rear- firing passive rad, B" m f Touch Switch Al./Hom 8MI0474 $7.88 p structions. Leo E. Smith. Box 945, Veteran's Home, Yount - MR (W), 35" superhorn ul AI. Wireless Xmitter 8S20110 $14.88 For ville, CA 94599. piezoT. Freq resp 301íz Al. 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General Electric model M8635A stereo receiver. 11988pair Elec. Bike Al. 7S70456 $7.501 , Schematics, parts list and operating instructions. Todd Cart- BIG 9" VIDEO MONITOR $49.88 ÿ er. 2671 Greentree Ct. Jenson, MI 49428. MOTOROLA COMPUTER Monitors -R.. z BRAND NAME U.E.. Runs 12 VDC. off ,BA. Scans Vert. Gonset model Super -- Cabinet, 8" woofer /mid - rang - D GR212 receiver. Need schematic and align- Rotate Yoke, scans . as is passive radialer, 2 Horiz. Sold -4':" super horn, Piezo USE ment Instructions. Arthur D. Cox, 1507 Gannon Dr., Sac- tweeters, terminais. grill cloth, wire you chg. & save. Qty. Ltd. Moiorola No. m acoustic dampening material, hardware, 69VP106 -O01.. Size. 9w x 8'd z 8%h. ramento. CA 95825. 8 nstructions etc. Freq. resp. Is 10 HZ w /data. TO 25,000 HZ., 75 watts max. power. Sh. Wt. 151b. D91302 S42.88 Sh. Wt. 98 Lbs. (3 Pkgs). Sears model 5177, chassis #528, 62123 color TV. Need Use this great speaker system for big COMPUTER O schematic. band speakers, monitor speakers, all ZIP John Baldwin, 203 6th Av., N.E., Waseca. MN around music speakers or with "(DISCO" SURPLUS 56093. Systems. Oon't Delay! These will go fast. Seconds, Nicks, Chips. Cab. is structually COMPUTER STUFF - und.... Tou finish 8 save. I/O Printer(Daisy W.)9320247 $168.88 -I Sun model 550 ignition analyzer osbilloscope. Need sche- 9110123 . 9,88/pr, $1,998.88/20 $11 pr. 9 "Vid. Mon.ICanraclYou repair & save matic and cables. D. Smith, 3561 Marian Dr.. Trenton, Ml Data supplied 91380154 $38.88- n CODE 48183. POWER SUPPLY KIT *33 ASR TTY 9320083 $348.88- I INPUT *33 RO TTY 9320088 $248.88- RBM scanning monitor receiver. Need schematic and any 11 5 VOLTS MD 70 Singer Pr. 932088 $348.88- D jlr Pl other information. James Hall, Rt. 3, Box ='t 5" Muffin fan 870532 $8.88 - 281A, Staunton, VA 16 HZ. 'ASCII Keyboard cons. 8W0584 $68.881 ' 24401. Camp. 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P- 8 5 amps. Sh. w1. 15 Lbs. and schehlalic. ohilco model 18 radio. Schematic and parts 6%1160301 REIGNS 119 Foster Street $14.88 SUPREME mail lise needed. Nicholas I. Oshana Jr., 187 Morningside Dr., Use your BA -MC or AE for telephone Peabody, MA 01960 Bristol, CT 06010. orders. No C.O.D.'s please. (617) 531-5774 m Pbu urbi POSTAGE -I l's or l'art . VISIT OUR CATALOG SHOWROOM 119 FOS TER ST. PEABODY EJ 1 O Eico model HF -20 pre -amplifier needed. W.S. Reynolds. r 733 Plantation Circle. Roanoke, VA 24019. CIRCLE NO. 10 ON FREE INFORMATION CARD 94 POPULAR ELECTRONICS

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 86 ElectronicsClassified REGULAR CLASSIFIED: COMMERCIAL RATE: For firms or individuals offering commercial products or services, $2.50 per word. Minimum order $37.50 EX- PAND -AD "' CLASSIFIED RATE: $3.75 per word. Minimum order $56.25. 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, $1.50 per word. No minimum! DISPLAY CLASSIFIED: 1" by 1 column (2-1/4" wide), $300. 2" by 1 column, Ad must be typewritten or $600.00. 3" by 1 column, $900.00. Advertiser to supply film positives. For frequency rates, please inquire. GENERAL INFORMATION: copy clearly printed. Payment must accompany copy except when ads are to be billed on credit cards - American Express, Diners Club, Master Charge, VISA (supply expiration date) - or when ads are placed by accredited advertising 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, N.Y. 10016. For inquiries, contact Linda Lemberg at (212) 725-3924.

NAME BRAND Test Equipment. Up to 50% discount. Free RECEIVE FREQUENCY ADAPTOR, converts your receiver FOR SALE catalog. Salen Electronics, Box 82, Skokie, Illinois 60077. to digital readout. Davis Electronics, 636 Sheridan, Ton- awanda, NY 14150. 1- 716/874 -5848.

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DB- 100 -ADJACENT CHANNEL FILTER -most incredible ELECTRONIC PARTS, semiconductors, kits. FREE FLYER. horn and dome tweeters. Over 30 in all. Build midranges, filter ever offered to civilian market. Replaces any .455 Large catalog $1.00 deposit. BIGELOW ELECTRONICS, speaker system and we'll provide top quality your own 100 DB's. Works on Bluffton, Ohio 45817. speakers and design information. Send for FREE 48 page K.C.I.F. filter to increase selectivity up to color catalog from the largest. most experienced speaker any receiver, transceiver, etc.. using .455 K.C.I.F. Free fact RADIO -T.V. Tubes -36 cents each. Send for free catalog. kit manufacturer in the world. DON'T DELAY. Write today.' sheet, or send $29.95. SSB Publications, Box 960, Hyannis, Cornell, 4213 University, San Diego, Calif. 92105. MA 02601. AMATEUR SCIENTISTS, Electronics Experimenters, Sci- SCANNERS: WHOLESALE PRICES! Bearcat 220 - ence Fair Students ... Construction plans - Complete, in- $329.95: Regency K500 - $329.95; Bearcat 250 - $279.95: cluding drawings, schematics, parts list with prices and Dept.eelserlab APE, 735 N. Northlake Way plus 20 other models at similar discounts from the nation's sources ... Robot Man - Psychedelic shows - Lasers - Seattle, Washington 98103 scanner specialist. VISAMastercharge okay. Phone: (415) Emotion/Lie Detector - Touch Tone Dial - Quadraphonic 573 -1624. Free catalog. Write: Scanners Unlimited, 1326 El Adapter - Transistorized Ignition - Burglar Alarm - Sound POLICE FIRE SCANNERS, crystals. antennas, CBs, Radar Camino Real. Belmont, California 94002. Meter ... over 60 items. Send $1.00 (no stamps) for complete CO 80219. Detectors. HPR, Box 19224. Denver, Free catalog. E. French, catalog. Technical Writers Group, Box 5994, University Sta- ELECTRONIC TEST EQUIPMENT. tion, Raleigh. N.C. 27650. CB RADIOS, VHF -UHF Scanners. Crystal, Antennas, Radar PO Box 249, Aurora, IL 60507. Detectors. Wholesale. Southland, Box 3591, Baytown, TX for promotions, adver- SOUND SYNTHESIZER KITS-Surf $14.95, Wind $14.95, ROBOTS FOR SALE. Radio controlled 77520. Mar- Wind Chimes $19.95, Musical Accessories, many more. tisement, etc. Send $1.00 for information to: Connecticut keting, 70 Russell Avenue, Plainville, CT 06062. Catalog free. PAIA Electronics, Box J14359. Oklahoma City, UNSCRAMBLE CODED MESSAGES from Police, Fire OK 73114. AND BEST in electronic components, books and and Medical Channels. Same day service. Satisfac- LATEST supplies. Write for big free catalogue. TRI -TEK, 7808 N 27 HEAR POLICE i FIRE Dispatchers! Catalog shows exclusive Don Nobles Electronics, Inc., Rt. 7, AZ directories of "confidential" channels, scanners. Send post- tion guaranteed. Ave., Phoenix, 85021. age stamp. Communications, Box 56-PE, Commack, N.Y. Box 265B, Hot Springs, Arkansas 71901. (501) BARGAINS GALORE! Monthly swap sheet for radio collec- 11725. 623 -6027. tors, hams, experimenters, etc. Send long SASE for sample. TELETYPE EQUIPMENT: Copy Military, Press, Weather, Electronics Trader, Box 2377, Argus. CA 93562. MONTHLY PICTURE FLYER. Quality Surplus Electronic Amateur, Commercial Transmissions. Catalog $1.00. parts. Low Prices. Star -Tronics, Box 683, McMinnville, OR KIT 318 SILENCER for WEATHER MAP RECORDERS: Copy Satellite Photographs, AUDIO NOISE REDUCTION - 97128. National -Local Weather Maps. Learn How! $1.00. Atlantic tapes, records, FM. Free brochure. LOGICAL SYS- Sales. 3730 Nautilus Ave.. Brooklyn, NY 11224. Phone: (212) PRINTED CIRCUIT supplies, chemicals, tools, artwork. plat- TEMS, 3314 'H' St., Vancouver, Washington 98663. 372 -0349. ing solutions. Major credit cards. Catalog $1.00, refundable. CIRCOLEX, Box 198, Marcy, NY 13403. PRINTED CIRCUIT BOARDS, double, single- sided. From WHOLESALE C.B., Scanners, Antennas, Catalog 25 cents. schematic, sketch. finished artwork. We design computer Crystals: Special cut, $4.95, Monitor $3.95. Send make, RECONDITIONED TEST EQUIPMENT $1.00 for catalog. interface prototypes. WEB Printed Circuits, P.O. Box 3851, model, frequency. G. Enterprises, Box 461P, Clearfield, UT WALTER'S TEST EQUIPMENT, 2697 Nickel. San Pablo, CA Kingsport, Tenn. 37664. 84015. 94806, (415) 758 -1050.

BUILD AND SAVE TELEPHONES, TELEVISION, DETEC- NEGATIVE ION GENERATORS AND ACCESSORIES. ANTENNA ACCESSORIES CATALOG for Hams. CBers TIVE, BROADCAST Electronics. We sell construction plans (Kits). Fascinating details -$1.00. Golden Enterprises, Box and Home TV innovators has application data. with an Engineering Service. Speakerphones, Answering 1282 -PE, Glendale, Arizona 85311. Machines. Carphones, Phonevision, Dialers, Color TV Con- Send 15¢ stamp to: Dept. PE2, Unadilla/Reyco, Box verters, VTR, Games, $25 TV Camera. Electron Microscope, 280, East Syracuse, NY 13057. Special Effects Generator, Time Base Corrector, Chroma Super Key. Engineering Courses in Telephone, Integrated Circuits, Powerful Wireless Mic . 10 times more powerful than other mics. Detective Electronics. PLUS MUCH MORE. NEW Super Transmits up to mile to any FM radio News Hobby Catalog PLUS year's subscription to Electronic Easy to assemble kit 15V battery not foci.) SFITELL/TE TU $1.00. Don Britton Enterprises, 6200 Wilshire Blvd., Letter, 7451000 or send . Call (305) $16.%+ 51.00 . GET 50 CHANNELS! Los Angeles, Calif. 90048. shipping to USI Corp P.O. Boa PE -2062, $18.95 q s air true' No matter where KR, dye Melbourne, FL 325 01. COD's weep.eep . For moes.vi sports pay television NAME at discount prices. 72 voice °a `"ii. sportse from around the world' 24 nour BRAND TEST EQUIPMENT catalog of transmitters. scramblers de5qnFor page catalogue free. Write: Dept. PE, North American Elec- and other speciali items. enclose $2.00 to USI Cor. crorcomplete t,na rord mn ,o sourceours aS Iformtion send S7.95. tronics, 1468 West 25th Street, Cleveland, OH 44113. - - - - - ""-""""-""- SPACECOAST RESEARCH UNSCRAMBLERS FOR any scanner. Several models avail- TRANSISTORS, IC's, RF- Power, for communications. TV, Dop.. D. P.o. Boo 442. Altamonte Springs, FL 32701 able. Free literature. Capri Electronics, 8753T Windom, St. audio repairs, 2SC756A - $2.00. 2SC1307 - $2.15, 2N6084 - Louis, MO 63114. - $8.75. Many more. Free catalog. B &D En- $14.50, STK439 DOLBY DECODER now available assembled or as kit. Com- terprizes, Box 32, Mt. Jewett, PA 16740. (814) 837 -6820. UNSCRAMBLER KIT. Tunes all scramble frequencies, may prehensive review. PAE Integrex, Box 747, Havertown, PA be built -in most scanners, 2 -3 4 x 2-1A X 1/2. $19.95. Factory 19083. built Code- Breaker. $29.95. Free Catalog: KRYSTAL KITS, New Morse -A -Word Code Reader Box 445, Bentonville, Ark. 72712. (501) 273 -5340. TUBES B &K Test Equipment. Free catalog. Free Shipping. Dinosaur VERS SPEAKER r EIGHT discounts. Spacetron -AX, 948 Prospect, Elmhurst, IL 60126. CuARACIER READOUT ORDER G -NORLú C%UM 32.95 KIT St. SEND RADIO & T.V. Tubes -36 cents each. Send for free Catalog. BUILD THE ARTISAN ELECTRONIC ORGAN The 20th HECK OR MONEY ORDER USE 4213 ... YOUR VMA OR MASTFR CHARGE Cornell, University, San Diego, Calif. 92105. century successor to the classic pipe organ. Kits feature mod- ADD 53. FOR SHIPPING ular construction, with logic controlled stops and RAM Pre -Set TUBES: "Oldies ", Latest. Supplies, components, schematics. Steinmetz. 7519 -PE Ma- Memory System. Be an ar- ti -san. Write for our free brochure. 716rtJZOdlalii Corporation Catalog Free (stamp appreciated). .o. rarre.ura, wr.rR..r rr saoer AOK Manufacturing, Inc., Box 445, Kenmore, WA 98028. plewood, Hammond, Ind. 46324.

95 AUGUST1979

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 87 TUBES -RECEIVING, Industrial and Semiconductors Factory BUILD DIGITAL DIAL for AM Broadcast Receivers. Simple LEARN WHILE ASLEEP! HYPNOTIZE! Astonishing Boxed. Free price sheet including TV, Radio and audio parts Inexpensive - details, - Accurate. Uses Standard components. Infor- strange catalog free! list. Transleteronic, Inc., 1365 Autosuggestion, Box 24-ZD, Olympia, 39th St., Brooklyn, New York mation;SchematiclLayout $3.95. W.M. Whitley, 5603 11218. - Washington 98507. Telephone: (212) 633-2800. Toll free: 800 -221 -5802. Lemonwood, Austin, Texas 78731. INTENSIVE 5 week course for Broadcast RADIO AND TV TUBES 1938 to 1978 $1.00 ea. PRELLER Engineers. FCC UNIQUE DEVICES FOR STEREO. etc. Catalog $1. Lusus, First TV, Augusta, AR 72006. (501) Class license. Student rooms at the school. Radio En- 347 -2281. 31W251 Rte. 64, West Chicago, IL 60185. gineering Inc.. 61 N. Pineapple Ave., Sarasota, FL 33577. WIRELESS FM MICROPHONE, electronic siren, 10 watt PLANS AND KITS alarm. Kits $5.25 each. Electrokit, Box 568, Milford, MA 1979 "TESTS - ANSWERS" for FCC First Class 01757. License. Plus - "Self Study Ability Test." Proven! TOP QUALITY IMPORTED KITS, IC's. foreign transistors. SPEAKERPLANS - Build ANY size speakers without special $9.95 Unconditional Moneyback Guarantee. Com- Free catalog. International Electronics, Box 567, Williamsville, tools, experience. FOOLPROOF, illustrated instructions, parts mand Productions, Box 26348 -P, San Francisco, CA NY 14221. sources. 80% SAVINGS! Rush $4. SPEAKERPLANS, 275 Main, Stirling, NJ 07980. 94126. ELECTRONICS KITS: For information, send self addressed RADIO stamped envelope. GI Kits, Box2329. Garland, TX 75041. BROADCASTING: Become DJ, engineer. Start your TELEPHONES & PARTS own station - investmenti experience unnecessary! Receive free equipment, records. Free details. Broadcasting, Box AMAZING ELECTRONIC 130 -A8, Paradise, CA 95969. PRODUCTS TELEPHONES UNLIMITED, EQUIPMENT SUPPLIES. FCC LICENSE over 1200 questions, answers, discussions, illustrations. 3rd, 2nd, 1st, phone, radar, broadcast, endorse- LASERS SUPER POWEED. ALL TYPES, REGULAR, KEYED, MODULAR. FREE TECHNICAL ments. $14.95. SPECIFIC DE BUGGING UNCRAMBLERS PG ANT TESLA STUNWANDrRTV SKILLS INTERNATIONALE Inc., CATALOG. Call now toll free. (800) 824 -7888. In P.O. Box 1233, Cocoa, Florida CHEMICAL, 32922. Mastercharge ,.VISA. ULTRASONIC. CR, VERO, AUTO AND MECA DEVICES,EHUNDRIEDS

MORE . 'ALL NEW PLUS INFO UNLTD PARTS SERVICE. California (800) 852 -7777. Alaska- Hawaii (800) UNIVERSITY DEGREES BY MAIL!!! Bachelor's, Master's, INFORMATION unlimdpii 824 -7919. Ask for operator 738. Doctorates. Free Information. Careers, Department Educa- CATALOG DI Dept. ER, Box 716, Amherst, NH 03031 tion, Box 10068, Washington, DC 20018. OMAK PHONE CENTER. All types of telephones - keyed, modular and decorator. Catalog $1.00 (refundable). Box 38, EARN HIGH SCHOOL DIPLOMA, spare time. College - FREE KIT Catalog contains Test and Experimenter's Beardstown, IL 62618. (217) 323.3963. recognized. Credits given for previous courses, job experience. Low tuition. Exams Equipment. repeated free. Individual counseling. Dage Scientific Instruments, Box State registered. Cambridge ALARMS Academy, Dept. PE -1, 409 E. 1054P, Livermore, CA 94550. Osceola, Stuart, Florida 33494. Toll -free 1- 800 -327 -8103. LOANS - Former bank executive explains how to obtain QUALITY BURGLAR -FIRE ALARM EQUIPMENT at discount loans from banks, other lenders. $3.00. Businessman's sup- prices. Free Catalog! Steffens, Box 624K, Cranford, N.J. plement $2.00. Sylvan Press, P.O. Box 18212, San Jose, CA 07016. 95158.

GOVERNMENT SURPLUS TIGER 500 SIMPLI -KIT MANUALS for Govt Surplus radios, test sets, scopes. List 50 cents (coin). Books, 7218 Roanne Drive, Washington, D.C. FOR THE DO- IT- YOURSELFER Billions of dollars lost annually due 20021. NOW! a high quality to lack of protective warning alarms. CD ELECTRONIC JEEPS -$59.30!! - CARS -$33.50!! - 200,000 ITEMS!! - IGNITION SYSTEM in kit form. GOVERNMENT SURPLUS Most COMPREHENSIVE DI- FREE - Contains all components and solder to CATALOG Shows you how to RECTORY AVAILABLE tells how, where to buy YOUR build - complete Solid -State Electronic CD protect your home, business AREA - $2.00 - MONEYBACK GUARANTEE - Govern- Ignition System for your car. Assembly ment Information Services, Department GE -80, Box 99249, requires less than 3 hours. FIR£ and person. Wholesale San Francisco, California 94109. Increases MPG 15% Eliminates 4 or 5tuneups s.e« prices. Do- it- yourself. Free GOVERNMENT SURPLUS. Buy your Area. Increases horsepower 15% Instant starting, any How, where. Plugs and Points last weather engineering service. Send $2.00. SURPLUS HEADQUARTERS BUILDING, Box 50,000 miles Dual system switch 30177-PE. Washington, D.C. 20014. Fits only 12 volt neg. ground "GOVERNMENT SURPLUS DIRECTORY" Buy 500,000 Only $26.95 postpaid Box 82802 PE -089 Lincoln, Ne. 68501 items (including Jeeps) . .. low as 2¢ on dollar! Most complete Corporation information available - $2.00 (guaranteed). Surplus Dis- 7tStar posal. Box 19107 -HH, Washington, DC 20036. P 0. Box 1727 Grand Jonct,on, Colorado 81501 GUIDE TO CHOOSING AND INSTALLING AUTO BURGLAR ALARMS. Send $6.95 to: Auto Securities, P.O. Box 22487. Honolulu, Hawaii 96822. FOR INVENTORS BUILD PROFESSIONAL Quality Alarm systems for your home. For YOUR OWN free catalogue. write: EAC. Electronics Department. Box PATENT AND DEVELOP Your invention, Registered Patent 7881A, Colorado Springs, CO 80933. Agent and Licensed Professional Engineer, Send for FREE SYMPHONY PATENT INFORMATION every inventor should have. Richard L. Miller, P.E., HIGH FIDELITY 3612 Woolworth Building, New York, OF SOUND! NY 10007. (212) 267 -5252. Its fun and easy -takes just min- DIAMOND NEEDLES and Stereo Cartridges utes at Discount INVENTIONS WANTED a day! Complete kits for prices for Shure, Pickering, Stanton, Empire, Grado and ADC. organs, pianos, strings, FREE CONSULTATION NO IDEA TOO SMALL rhythms, Send for free catalog. LYLE CARTRIDGES, Dept. P, Box 69, amplifiers, synthesizers. Also Kensington Disclosure orolechon Cash or rOyall,es from manu)aclu,ers seeking Station, Brooklyn, New York 1 1218. For Fast Ser- new ,Osas For free factory assembled. 104 lnIo,mal,on un how lo p,olecl your ,dras. -page vice call Toll Free 800- 221 -0906. Cali or Wore catalog S2.00 LOWEST PRICES on stereo components. BOSE, SAE. DBX American Inventors Corp. and more. Dynamic Sound, Box 168(B), Starkville, MS 39759. 59 Interstate Dr, Dept PE OWERSI (601) 323 -0750. 1 PM - 9 PM. West Springfield, MA 01089(413) 737 -5376 Wersi Electronics, Inc. A Fee Based service Company Dept. ZD, 1720 Hempstead Road WANTED UNPATENTED IDEAS AND INVENTIONS can be sent di- Lancaster, PA 17601 rectly to companies as an external submission. If a company is interested, help with the drafting and filing of a patent appli- TV- OSCILLOSCOPE CONVERTER externally adapts TV into GOLD. Silver, Platinum, Mercury, Tantalum wanted. Highest cation is usually given. Send $3.00 for: procedure outline, audio frequency oscilloscope. Info. $1.00, Plans $7.50, with prices paid by refinery. Ores assayed. Free circular. Mercury external submission form copies, guide for corporation ad- P.C. $15.00, complete kit $60.00. Evoluctionics, Box 855 -J, Terminal, Norwood, MA 02062. dresses and interests: to: Submissions Dept., P.O. San Rafael, CA 94902. Box 55, Rochester, MN 55901. PRINTED CIRCUIT Boards from sketch or artwork. Kit pro- PERSONALS MR. INVENTOR: America's foremost development firm jects. Free details. DANOCINTHS Inc., offers Box 261, Westland, MI a complete 48185. service. For free details, write: Charles S. Prince Co., Inc.. Empire State Building, Suite 3308 -E, N.Y.C. 10001. MAKE FRIENDS WORLDWIDE TELETYPEWRITER USERS: Unique solid state time delay through international correspondence, illustrated relay. Reduces energy and maintenance costs. Information brochure free. Hermes -Verlag. Box 110660íZ, D -1000 Berlin 11, W. 50¢, Plans $5.00, with P.C. $10.00. KEITH RYAN. Box Germany. BUSINESS OPPORTUNITIES 3103 -P, Ottawa, CANADA, KIP 6H7. U.S. Inquiries. TESLA COIL - 40" SPARKS! Plans $7.50. Information 75 INSTRUCTION ERASE DEBTS with little -known law -create wealth!! Details cents. Huntington Electronics, Box 2009 -P, Huntington, Conn. FREE -Blueprints, No. EE8, Box 900. Bronx, NY 10471. 06484. I MADE $40,000.00 Year by Mailorder! Helped others make UNIVERSITY DEGREES BY MAIL! Bachelors, Mas- TAPE - SLIDE, Synchronizer, multiprojector, lap -dissolve money! Torrey, Box 318 -NN, Ypsilanti, Michigan 48197. plans, $5.50. Audiovisual group, $8.50. Millers. 1896 ters, Ph.D's. Free revealing details. Counseling, Box NEW LUXURY CAR WITHOUT COST! Free Report. Codex - Maywood, S. Euclid, OH 44121. 317 -PE08, Tustin, California 92680. ZZ. Box 6073, Toledo. Ohio 43614. (419) 865 -5657.

96 POPULAR ELECTRONICS

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 88 MECHANICALLY INCLINED individuals desiring ownership of Small Electronics Manufacturing Business - without in- MICROCOMPUTERS Popular Electronics vestment. Write: BUSINESSES, 92-K2 Brighton 11th, Brook- lyn, New York 11235. TRS -80 MICRO COMPUTERS by Radio Shack' at 15% dis - INDEX MILLIONS in Mail!!! Free Secrets. Transworld-17, Box 6226, ADVERTISERS count! Also have software for business systems. Micro Man- Toledo, OH 43614. agement Systems, Cairo, GA 31728. (912) 377 -7120. READER SERVICE NO. ADVERTISER PAGE NO. MECHANICALLY INCLINED INDIVIDUALS RUBBER STAMPS Assemble electronic devices in your home. In- 3 Aaron -Gavin Instruments 68 vestment, knowledge, or experience not neces- 4 Active Electronics Sales Corp. 81 sary. Get started in spare time. Above average RUBBER STAMPS. BUSINESS CARDS. Many new prod- 6 Amelect, Inc. 67 ucts. Catalog. Jackson's, E -100, Brownsville Rd., Mt. Vernon. 4 profits. $300 - $600 /Wk possible. Sales handled 7 American Antenna Cover III. 62864. by others. Write for free details. 8 Ancrona Corp. 92 ELECTRONIC DEVELOPMENT LAB 2 AP Products, Inc. Cover 3 Drawer 1560 PE, Pinellas Park, FL 33565. BOOKS AND MAGAZINES 10 B & F Enterprises 94 BEAT THE RACES! Free Booklet! "Unlimited Lifetime Income before Christ. Wonderful From Thoroughbreds- Harness '. Elias, Box 47BB, Brooklyn. FREE book prophet Elijah coming 52 Cambridge International, Inc. 59 Mission, Dept. 64, 481 Thurston NY 11219. bible evidence. MEGIDDO 93 Rd., Rochester, N.Y. 14619. Chaney Electronics EARN EXTRA MONEY Homeworkers Needed Stuffing Cleveland Institute of - POPULAR INDEXES For 1977 now avail- Envelopes! Free Details. Write: Jadeway, Box 186-ZD, ELECTRONICS Electronics, Inc. 36, 37, 38, 39 able. Prepared in cooperation with the Editors of "PiE," this Gaines, MI 48436. 1 Communications Electronics 76 references to product tests. con- index contains hundreds of 12 Company 76 FREE CATALOGS. Repair air conditioning, refrigeration. struction projects, circuit tips and theory and is an essential Consumers 9 Tools, supplies, full instructions. Doolin, 2016 Canton, Dallas, companion to your magazine collection. 1977 Edition. $1.50 13 Continental Specialties Corp. Texas 75201. per copy. All editions from 1972 onward still available at the Crutchfield Corp. 12 same price. Add $.25 per order for postage and handling. $.50 $1200.00 MONTHLY Correcting Pupils' Lessons!!! Start Im- per copy, foreign orders. INDEX, 6195 Deer Path, Manassas, Products, Inc. 79 mediately. Free Report. Send self- addressed stamped en- 16 Delta Va. 22110. 87 velope. Home, Box 98201 -SJXR, San Diego, CA 92109. 17 Digi -Key Corp. Digital Research Corp. 92 MANUFACTURER offering exclu- QUALITY ELECTRONICS 18 Douglas Dunhill 46 sive marketing areas to persons with dental /medical, elec- UNDERSTANDING DSI Instruments, Inc. 30 tronics, and/or professional background. Dealerships for CALCULATOR MATH 15 sales and installation of innovative electronic products. Unlim- 224 pages. 53 95 Order eLCB 3321 Check or I r ited growth with complete factory support. Send confidential 19 EICO 66 money order Texas Instruments. P 0 Box 3640 Bloomfield resume to Scott Ritchie, EEC, 797 Industrial Court, M /S84 Dept PEB79. Dallas. Texas 75285 Add N 20 Electra Co. 2 Hills, Michigan 48013. sales tax where applicable. 21 Fluke 7 GET RICH SLOWLY! How to operate your own profitable ser- TEXAS INSTRUMENTS vice business. Years of information and experience con- 22 Fordham Radio Supply 91 1,1 t11í PORN l 11 densed in one easy -to- understand guide. $9.95. ESI, 4500 23 Formula International 8 East Speedway #33, Tucson, Arizona 85712. "OWNER REPAIR OF AMATEUR RADIO EQUIPMENT" 24 Fuji Photo Film USA, Inc. 15 WIN AT FOOTBALL! We beat the pointspread an incredible Book. $7.95. K6RO, 14910 LG Blvd.. Los Gatos. CA 95030. 70% last 11 years! CBS -TV called us No. 1 football prediction 25 General Engines Co. 93 CB TECHNICIANS now available SSB Engineering newsletter! Guaranteed winner! Free: game by game record - - 93 Practice Manual. Most comprehensive book on how to modify 26 Godbout Electronics, Bill last 4 years. Winners Sports, 5711 -S 14th Ave., Brooklyn, NY and expand any CB radio for maximum performance and 27 Grantham College of Engineering 66 11219. range. Includes the newest PLL radios. Free fact sheet or EARN $1000 STUFFING 1000 ENVELOPES! Money back send $14.95. SSB Publications. Box 960. Hyannis. MA 02601. 5 Heath Co. 63, 64, 65 guaranteed. Details $1.00. D. Fraser, 208 S. 4TH, DeSoto, MO 63020. 28 Illinois Audio 77 HYPNOTISM BORROW $25.000 "OVERNIGHT." Any purpose. Keep indef- 29 Integrated Circuits 82 initely! Free Report! Success Research. Box 29263 -GH, In- 30 International Components Corp. ....90 dianapolis, Indiana 46229. FREE Hypnotism. Self- Hypnosis. Sleep Learning Catalog! Drawer H400, Ruidoso, New Mexico 88345. 77 Earn $20- $40!hr. being in busi- 31 J & R Music World BECOME A CONSULTANT. 88, 89 ness for yourself. For detailed information on starting or ex- 32 Jameco Electronics panding your own engineering consulting business, write: Dr. MOTION PICTURE VIDEO FILMS JS & A National Sales Group 1 S. Tomczak, ST &A, Dept. PO. Box 480530, Los Angeles. CA 33 Jensen Tools and Alloys 22 90048. ratings: Beta. VHS. Bought, Sold, Rent- VIDEO MOVIES: all 34 Kedman Company 76 ed. VCR's. Blank tapes. Supplies: Cat. $1.00 (deductible). EMPLOYMENT OPPORTUNITIES (201) 572 -1222. Devoe, P.O. Box 593. Edison, NJ 08817. ELECTRONICS/AVIONICS EMPLOYMENT OPPOR- DISCOUNT VIDEO TAPES, Adult movies. Free price list. 35 McIntosh Laboratory, Inc. 6 TUNITIES. Report on jobs now open. Details FREE. Aviation VTR, Box 234, Herald, CA 95638. (209) 748 -2616. Micro Computer Mart 73 Employment Information Service, Box 240E, Northport, New JUST OUT OF THIS WORLD! "Superman" (Christopher Re- 37 Micro World 93 York 11768. eves) S -8 colorisound; "Buck Rogers" (Gil Gerard) special 38 Mini Micro Mart 76 RADIO -TV JOBS ... Stations hiring nationwide! Free details: effects space age movies. 200' S -8 Eastman color Meg snd, Vine, Hollywood, CA 90028. only $29.95 ea: both $57. "Superman" also avail in 4C3' S -8 "Job Leads ", 1680 -PG 39 Netronics R & D Ltd. 75 col snd format, $48.95 ea special. Add $1.25 ea postage. INSTRUCTORS. Challenging career oppor- R D 71 ELECTRONICS Spend Father's Day Gift Dollars order Alfred Hitchcock's 40 Netronics & Ltd. electronics - tunity with advancement with fully accredited "Frenzy" scenes from the big picture. "Incredible Shrinking NRI Schools 16, 17, 18, 19 4 -5 industry experience. Very - schools. Prefer at least years Man" (Journey into the unknown). S -8 B/W 200' and $17.95 satisfying environment working with young people. Send re- in ea a 90p ship. Other price selections: Abbott and Costello 41 Ohio Scientific Instrument 5 sume to: United Electronics Institute, 1201 E. Atlantic Blvd.. Who's On First (baseball classic) 200' S -B BMW snd, $18.95: 42 OK Machine & Tool Corp. 43 Florida 33060. Or call: Mr. Gold 1 -800- Pompano Beach, 100 footer. $14.95. Stay at home & enjoy movies! Watch Wal- -1110 for national placement. Equal Opportunity 11 onComputing 13 327 ter Matthau in "Fail Safe" & Jimmy Stewart in "Mr. Smith Employer. Goes to Washington" 400' S -8 B, W snd only $35.95 ea PPD. Inc. 71 Summertime Music - Thoroughly Modern Millie: Sweet Char- 43 PAIA Electronics, DO -IT- YOURSELF ity; Jesus Christ Superstar, 400' color S-8 and features priced 44 PAL "F irestik" Antenna Corp. 74 to sell out @ $42.95 ea PPD. Limited offer while stock lasts. 45 Poly Paks 84 AUDIO 'ANALOG SYNTHESIS. Plans, parts, kits. etc. for the Mail order today! New Universal 64 -pg glossy catalog, $1.25. most exciting sound projects ever. Get on our mailing list, Columbia, Sportlite, Ring Classics, Universal order forms, 46 Quest Electronics 80 send 25y to: CFR Associates Inc., Newton. N.H. 03858. 400ea. SPORTLITE FILMS, Elect -8,79, Box 24 -500, Speed - way, IN 46224, Radio Shack 83 COMPLETE LINE Security Systems for home, Busi- ness. Send self addressed, stamped envelope. Dar - MISCELLANEOUS Sabtronics International, Inc. 69 bar, Box 1147E, San Diego, CA 92112. Sharper Image, The 10, 11, 21 Inc. 14 ELECTRICAL: testers, books, tools, supplies. Do It Yourself, MPG INCREASED! Bypass Pollution Devices easily. RE- 47 Shure Brothers professional. Free 108 page catalog. Bluffton Products, Dept. VERSIBLY!! Free details - Posco GEE8, 453 W. 256. NYC 48 Solid State Sales 91 A, Box 87, Bluffton, OH 45817. 10471. Speakerlab, Inc. 74 Synchro Sound 68 NEW CAR FREE YEARLY! Free information! Super-Car Pub- REAL ESTATE lications, Box 28101 -N, St. Louis, MO 63119. 50 Tab Books 77 BIG ... FREE ... FALL CATALOG! Over 2,600 top values GASOLINE MILEAGE INCREASED DRAMATICALLY! Sim- 36 Timeglow Company 41 coast to coast!! UNITED FARM AGENCY, 612 -EP, West plified retuning methods. Details FREE! Techneering, Box 12191 PE, Norfolk, VA 23502. 47th, Kansas City, MO 64112. 51 U.S. Marine Corp. 27, 28, 29 97 AUGUST 1979

www.americanradiohistory.com IPR2017-01058 Garmin EX1021 Page 89 ELECTRONICSi Personal Electronics News

GM deletes "standard" radios in a settle- approval. If the U.S. Senate approves ment of the auto sound antitrust suit WARC resolutions including the change filed against it in March by members of the Litton seeks, it would overturn the FCC Custom Automotive Sound Association (CASA). ruling, since Senate approval would have Under terms of the settlement, General treaty status. Motors will offer the delete option on the standard radios of all of its recently introduced X -body cars. Moreover, GM will A computer marathon record is claimed by permit dealers to exchange a Delco radio a group of Holy Cross high -school students in these cars for credit against purchase in San Antonio, TX. The 311 students who of any GM part. (Former policy restricted took part in 82 -day around- the -clock exchange credit only toward purchase of training sessions believe their accomplish- another Delco radio.) GM also agreed not ment deserves mention in record books. to standardize Delco radios in any addi- Instructor Dennis Doose suggested the tional models through the end of the 1983 training marathon after students volun- model year. Thereafter, if GM intends to tarily began staying after class to use extend radio standardization, it will the school's TRS -80 microcomputer. Radio furnish CASA with at least four months Shack, manufacturer of the TRS -80, agreed notice. to lend the school 22 additional microcomputers for the event. A home energy- saving system has been developed by William Lamb (No. Hollywood, CA), pioneer in the development of silicon A talking Language Translator, utilizing solar cells. It consists of a lightweight speech synthesis and offering solid -state modules panel of 36 cells that are capable of deve- for various languages, was announced by loping 16 volts to charge a 12 -volt storage Texas Instruments. Designed as an battery at a 1.5- ampere /hr rate. Enough aid in communicating in a foreign country and for power is available from a single panel language students in learning to pronounce system to operate a low -power 12" mono- a foreign language, it is programmed chrome TV receiver. The glass surface of with a vocabulary of words and phrases selected each cell is toughened and backed by a for everyday use. The translator special chemical compound that makes it has the ability to form thousands of practically impervious to hammer blows and spoken phrases by linking together all kinds of weather. Virtually mainte- its spoken vocabulary words. Each module will contain nance -free, the system costs nothing to about 1000 words of which half will operate. Also, its modular design permits be spoken and displayed and half will be displayed quick expansion of the system at any time. only. Prices will be about $250 for Price of a 36 -cell system is $325. the Language Translator and $50 for each language module.

Microwave -oven market growth could be ham- pered unless frequencies near 10 GHz are The deaf can read TV dialog with a new de- allocated for cooking, according to Litton vice soon to be marketed by Sears, Roebuck Microwave Cooking. As a result, Litton and Co. Next year, ABC -TV, NBC -TV, and will try to bypass a recent FCC ruling by Public Service Broadcasting will be airing taking its case to the World Administrative about 20 hours of programs with special Radio Conference (WARC) to be held in encoding. When decoded, dialog will appear Geneva in September. The FCC, currently on- screen in caption form with the aid of considering a proposal for a common- carrier the decoding device. Captioning informa- data network based in part on local 10 -GHz tion will not appear on the screen if no radio facilities, said microwave -oven use decoder is used. For the past eight years, in those bands is "incompatible with exist- the department of Health, Education and ing and planned services for both bands." Welfare (HEW) has paid for the research Resolutions adopted at WARC will be sub- that has culminated in the development of mitted to participating governments for captioned programs.

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