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CIRCLE 180 ON FREE INFORMATION CARD www.americanradiohistory.com GET THE LATEST ADVANCES IN ELECTRONICS SUBSCRIBE TO- Electronics Electronicw"" ENJOY THE WORLD OF ELECTRONICS EACH MONTH! rogr LuriL Ric( Subscribe to the best informed electronics maga- Learn how to design with zine -the one that brings you the latest high -tech rogrammnbm logic deie od build this Iowcost construction PLD PROGRAMMER projects, feature articles on new tech-

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ant ImarnYe the oaalarma 01 art FMraCia Electronics Now looks to the future and shows you

You can Wert.' more what new video, audio and computer products are on than 1000 calore with o the horizon. You'll find helpful, monthly departments such as Video News, Equipment Reports, Hardware 9oHd tow OM Hacker, Audio Update, Drawing Board, Computer for tour 0004010 Connections, New Products, and more. All designed to '4,t!,. 7 ° MOO pun, ABN0 uoáu t1iAo elletta,a Ms Yen give you instruction, tips, and fun. Electronics Now gives you exciting articles like: Buyer's Guide to Digital Oscilloscopes Build A Scanner Converter Single -Chip Voice Recorder Build A MIDI Interface for your PC Troubleshoot Microprocessor Circuits Build A High -Power Amplifier for your Car Add Music On Hold to your Phone All About Binaural Recording VGA -to -NTSC Converter

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www.americanradiohistory.com .duly 1994 Mimics, Vol. 65 No. 7

31 AMATEUR TV STATION Build this two -way TV station for both base and mobile operation. William Sheets and Rudolf F. Graf 41 THE "LED- HEAD" Watch our Electronic Face change its expression! Roger Sonntag 60 TUNABLE SHORTWAVE ANTENNA PAGE 41 Build this tunable antenna for improved shortwave reception. H.J. Wecke 67 TAKE BACK CONTROL OF YOUR TELEPHONE Upgrade February's Caller -ID project to provide name delivery. Terry J. Weeder ;Év: m--.,,..k...-p- PAGE 60 55 BUILD THIS PC I/O BREADBOARD The fundamentals of I/O transfer using Basic, Quick C, and DEBUG. Dave Dage 62 BUILD THIS COMPUTERIZED GAME Learn about computer games as you build the C -Game. Dan Retzinger

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49 RELAY OUTPUT CIRCUITS PAGE 62 Build one or all of these transistorized circuits that can switch and time relay functions remotely. Ray Marston

94 Advertising Sales DEP rr T 1 i 1 J Offices 8 VIDEO NEWS 78 AUDIO UPDATE 94 Advertising Index What's new in this fast - SPL damage /sonic realism changing field. Larry Klein 91 Buyer's Mart David Lachenbruch 80 DRAWING BOARD 16 Letters the PLL 20 EQUIPMENT REPORTS Build tachometer's 26 New Lit Wavetek BDM40 Benchtop section. Digital Multimeter. Robert Grossblatt 22 New Products 71 HARDWARE HACKER 86 COMPUTER 10 Q&A violations CONNECTIONS Second law and 6 What's News hacker opportunities. And then there were none. Holtzman Don Lancaster Jeff 3

www.americanradiohistory.com Bearania NOW R Hugo Gernsback (1884-1967) founder Although two -way amateur television (ATV) has been around for Larry Steckler, EHF, CET, years, the prohibitive cost of the editor -in -chief and publisher surs. vw..a. a«aw.r v..r,rrw necessary equipment put it out of EDITORIAL DEPARTMENT reach for most radio amateurs. But, Brian C. Fenton, editor thanks to recent advances in solid - Marc Spiwak, associate editor state technology, prices for ATV Neil Sclater, associate editor components have dropped dramat- Teri Scaduto, assistant editor Jeffrey K. Holtzman ically. This month, we show you how computer editor to take advantage of those afford- Robert Grossblatt, circuits editor able VCRs, camcorders, color N Larry Klein, audio editor receivers, and tiny video cameras David Lachenbruch contributing editor by incorporating them into a mobile, Don Lancaster battery- operated AN station weigh- contributing editor ing less than five pounds. Four re- Evelyn Rose, editorial assistant lated AN projects are presented: a ART DEPARTMENT complete AN transceiver; a 5 -watt, Andre Duzant, art director three -channel transmitter only; a 3/4- Injae Lee, illustrator watt, single channel Mini AN trans- Russell C. Truelson, illustrator mitter; and the 3/4 -watt, single -chan- PRODUCTION DEPARTMENT nel "AN Jr." (without audio ca- Ruby M. Yee, production director pability). Turn to page 31. Karen S. Brown advertising production Kathryn R. Campbell production assistant NEXT MONTH CIRCULATION DEPARTMENT Jacqueline P. Cheeseboro circulation director THE AUGUST ISSUE Wendy Alanko circulation analyst GOES ON SALE Theresa Lombardo circulation assistant JULY 5. Michele Torrillo reprint bookstore COMMERCIAL EDITOR Typography by Mates Graphics Get rid of the commercials from your videotapes! Cover by Loewy Design. Photography by Christopher Gould. CIRCUIT COOKBOOK Electronics Now is indexed in PLL Basics Applied Science & Technology Index, and Readers Guide to Periodical Liter- ature. Academic Abstracts. and RESTORE IT RIGHT! Magazine Article Summaries. Working with vintage audio gear. Microfilm ii Microfiche editions are available. Contact circulation depart- EPROM PROGRAMMER ment for details. Put the IBM PC I/O breadboard to work. Advertising Sales Offices listed on page 94. As a service to readers, ELECTRONICS NOW publishes available plans or information relating to newsworthy products, Electronics Now Executive and techniques and scientific and technological developments. Because of possible variances in the quality and condition of Administrative materials and workmanship used by readers, ELECTRONICS NOW disclaims any responsibility for the safe and proper Offices functioning of reader -built projects based upon or from plans or information published in this magazine. 1 -516- 293.3000. Subscriber Since some of the equipment and circuitry described in ELECTRONICS NOW may relate to or be covered by U.S. patents, Customer Service: ELECTRONICS NOW disclaims any liability for the infringement of such patents by the making, using, or selling of any such 1- 800- 288 -0652. equipment or circuitry, and suggests that anyone interested in projects consult a such patent attorney. Order Entry for New Subscribers: ELECTRONICS NOW, (ISSN 1067-9294) July 1994. Published monthly by Gernsback Publications, Inc., 500 -B Bi -County 1 -800- 999-7139. Boulevard, Farmingdale, NY 11735. Second -Class Postage paid at Farmingdale, NY and additional mailing offices. Canada Post IPM Agreement No 334103, authorized at Mississauga, Canada. One -year subscription rate U.S.A. and possessions $19.97, Canada $27.79 (includes G.S.T. Canadian Goods and Services Tax, Registration No. RI25166280), all other countries $28.97. All subscription orders payable in U.S.A. funds only, via international postal money order or check drawn on a U.S.A. bank. Single copies $3.50. 1994 by Gernsback Publications, Inc. All rights reserved. Printed in U.S.A.

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17294 If coupon is missing, write to: Electronics Engineers' Book Club. Blue Ridge Summit, PA -0860 a member of the As ELECTRONICS ENGINEERS' Electronics Engineers' BOOK CLUB ti Book Club .. . Blue Ridge Summit, PA 17294 -0860 . you'll enjoy receiving Club bulletins every 3 -4 YES! Please send me The Encyclopedia of Electronic Circuits - weeks containing exciting offers on the latest Vols. 1, 2 & 3 (5489C), billing me $9.95 plus shipping /handling & books in the field at savings of up to 50% off of tax. Enroll me as a member of the Electronics Engineers' Book regular publishers' prices. If you want the Main Club according to the terms outlined in this ad. If not satisfied, I Selection do nothing and it will be shipped may return the book within 10 days and have my membership automatically. If you want another book, or no cancelled. at return the reply form to us by book all, simply Name the date specified. You'll have at least 10 days to decide. And you'll be eligible for FREE BOOKS Address through the Bonus Book Plan. Your only obliga- city is to 3 more books during the next tion purchase State 2 years, after which you may cancel your membership at any time. Zip Phone Valid for new members only. subject to acceptance by EEBC. Canada must remit in U.S. funds drawn receive special ordering instructions. A Publisher's price shown. ©1994 EEBC on U.S. banks. Applicants outside the U.S and Canada will shipping/handling charge 8, sales lax will be added to all orders. RPIF794 5

www.americanradiohistory.com A review of the latest happenings in electronics.

Micromachined magnetic actuators Photolithographic and micro - machining techniques permitted researchers at the Georgia Institute of Technology to form the tiny electrical windings and nickel -iron cores in low- voltage magnetic microactuators that do things their electrostatic counterparts can't do. The microactuators are so small that they must be viewed under an electron microscope, as shown in Fig. 1. Georgia Tech scientists say the microactuators, made by techniques similar to those used in fab- ricating integrated circuits, could, FIG. 1- MICROMACHINED micro - actuator made by integrated circuit for example, replace transistors for fabrication techniques is examined switching high- frequency signals, under an electron microscope by operate microscopic valves, and be Georgia Tech scientists, (left), and components in microminiature volt- a microphotograph of a prototype planar, variable-reluctance magnet- age converters. ic micromotor (right). The low- voltage magnetic micro - actuators are said to be more corn - grated electrical windings and a plained. "But if you had a micromini- patibile with existing micro- magnetic actuator that has its iron ature version of the elec- electronic circuits than electrostatic core wrapped around its windings. tromechanical relay with two con- actuators. According to the re- This contrasts with an earlier micro - ductor lines in contact until you searchers, electrostatic actuators actuator made by forming the iron move one away, you could switch depend on high voltages to gener- core and electrical windings as sep- the signal far more effectively." ate the electrical charge differen- arate components. tials that draw the electrodes By integrating the tiny compo- Plastic lithium -ion battery together to create the necessary nents, it is possible to produce mul- A new, solid, rechargeable actuating force. tiples of one device simultaneously lithium -ion power cell that is as thin The lower voltages of the mag- on the same substrate as is done and flexible as a credit card, has netic microactuator make it less with integrated circuits. As in IC fab- been developed by Bell Communi- likely that it will cause the electrical rication, this technique would lower cations Research (Bellcore, arcs that could trigger an explosion manufacturing costs. (See Fig. 1.) Livingston, NJ), the research arm of where volatile gases or dust are Dr. Mark G. Allen, assistant pro- the regional Bell telephone operat- present. They say the devices will fessor in Georgia Tech's School of ing companies. also work in the human veins and Electrical and Computer Engineer- The plastic cells can be stacked arteries where blood conductivity ing, said the number of devices that to form batteries for powering small, would inhibit the generation of an can be made at one time is only light, handheld portable telephones, electrostatic charge. limited by the diameter of the sub- pagers, laptop computers, and vid- Magnetic microactuators also strate silicon wafer. eo games. Bellcore officials also be- can generate more force than their Several microactuator devices lieve that their new electrochemical electrostatic equivalents, although have been built and tested. Among technology can be scaled up to they are usually larger and draw them was a micro -relay that Dr. Al- function as automotive batteries more current. To surmount a major len believes could replace tran- and even power electric cars. drawback of magnetic microac- sistors as switches of high - According to Bellcore officials, tuators -high resistive loss -the frequency signals. "If you are trying the new cell is capable of offering Georgia Tech team is perfecting a to switch gigahertz- frequency sig- equal or greater energy than the re- device that can be switched by a nals for a microwave integrated cir- chargeable cells it is intended to single current pulse. cuit (MIC), a transistor is ineffective replace, and they are in cases which 6 The researchers formed inte- because of its leakage," he ex- Continued on page 85

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www.americanradiohistory.com VIDEO NEWS What's new in the fast -changing video industry. DAVID LACHENBRUCH

Home Digital VCR. Fifty corn - ing frequency will be 25 megabits analog HDTV recording system, W- panies worldwide have agreed on per second after bit -rate reduction. VHS, which is already available in specifications for all- digital consum- The audio track will use 48 kHz (18 Japan for recording and playback of er VCRs designed for standard TV bits) for two -channel recording, and standard, widescreen, and HDTV formats -NTSC, PAL, and 32 kHz (12 bits) for four-channel re- signals. However, it seems unlikely SECAM -and HDTV. Meeting in cording. Audio specifications are to achieve any great popularity in Tokyo, the Digital VCR Conference, similar to those for DAT recording, the U.S. or Europe. organized last September, ratified and presumably were chosen to earlier proposals and added some make digital copying difficult -al- Tapeless recording. Tape features. The specifications will be though the specifications as re- might not be the last word digital submitted to the International Elec- leased did not contain any specific recording. The first no- moving -parts trotechnical Commission (IEC) for mention of anti -copy system. recorders for consumer use are be- adoption as a world standard in an Tape speed for 60 -Hz systems ginning to appear. Norris Communi- attempt to avert a standards battle (such as NTSC) will be 18.812 milli- cations, of Poway, California, is in the future. The system is de- meters per second; for 50 -Hz sys- planning the first deliveries this signed to record both analog and tems (PAL, SECAM), 18.831 mm/ summer of a voice recorder that digital broadcasts as digital signals. sec. Discrete cosine transformation uses solid -state flash memory mod- The new digital video recorders, or (DCS) will be used for video rate ules instead of tape. Initially, the DVRs, could be in stores as early as reduction. For high- definition sys- "SoundClip" modules will have a next year -initially at high prices. tems, the video luminance sampling playing time of 30 minutes, but Nor- The first models in the U.S. are like- frequency will be 40.5 MHz; the vid- ris plans to extend that to 120 min- ly to be for standard (non -HDTV) eo recording rate will be 50 mega- utes and eventually to offer a music broadcasts only. bits per second after bit rate recorder. The initial solid -state dig- One immediately noticeable fea- reduction for both 125/60 and 1250/5o ital voice recorder is a pocket de- ture of the new format is the cas- systems. The tape will run at 27.594 vice that will list for $199. sette, which is considerably smaller mm /sec in both modes. In video recording, there are in- than current VHS types. Two sizes Detailed specifications are avail- creasing warnings that the mechan- are specified -one presumably for able for only one high- definition sys- ical recording is doomed to camcorders and the other for home tem- Japan's analog MUSE trans- disappear -just as the spinning decks. The smaller type is about the missions- because no country has disc and the mechanically rotated size of a digital audio tape yet adopted a digital HDTV system. tuner disappeared from the televi- (DAT) cassette. It measures However, the conference assigned sion set. John Bermingham, vice 2.6 x 1.9 x 0.48 inches and is de- working groups to develop detailed president of AT &T's Advanced Com- signed to record for 60 minutes in specifications for new HDTV sys- munications Technologies Group, standard mode and 30 minutes in tems -one for the Grand Alliance recently called magnetic media "an HDTV. The larger cassette is just system now undergoing tests in the endangered species" and classified slightly bigger than an audio -cas- United States, and another for the optical discs as merely a short -term sette box, at 4.9 x 3 x 0.57 inches; proposed European digital HDTV interim replacement. Addressing a it can store 4Y2 hours of standard system. group of recording media ex- video, and half that amount of How soon, how much? Al- ecutives, he forecast relatively rapid HDTV. The cassettes contain Y4- though industrial and broadcast ver- change to solid -state recording. inch -wide tape with evaporated sions of the new digital recorders With increasing sophistication of metal "or equivalent" coating. An could appear relatively soon, afford- data -compression algorithms, optional feature of the cassette is a able consumer models could take denser and less expensive solid - built -in IC memory for storage of a quite a bit longer. One estimate is state devices, and development of table of contents, recording dates, that the first versions will cost more broadband communication into the program title, and other information. than $3000. JVC, the inventor of home, mechanical recording is The Specifications. The sys- VHS recording and a member of the doomed, he said. tem will use digital component re- Digital VCR Conference, is trying to Microelectronics will make possi- cording for video. For all existing reassure the public that VHS will ble chips with "up to a billion com- non -HDTV standards, the lumi- continue to live, particularly in view ponents each" within about 15 nance sampling frequency will be of the vast library of material already years, Bermingham said. At some 13.5 MHz, the video quantization recorded on VHS. For the near time in the future, "audio compo- will be 8 bits, and the video record- term, JVC is pushing its 8 compatible Continued on page 25

www.americanradiohistory.com Design and Verify Circuits. Fast.

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AM INTERFERENCE TO AMPL /F/ER viously taken by Apple and, before I've put amplifiers and speak- that, the older S -100 based computers in several rooms of my ers. The motherboard carried the house, and they're all driven by CPU, memory, and the circuitry to line-level signals from a distri- support expansion cards. bution amplifier in my living ,OAF Although IBM also marketed room. Everything works well ex- software under its own name (most cept that I can always hear a lo- of it was licensed from other compa- cal AM radio station from the nies), it realized that its success de- speakers. Do you have any idea pended on the creation of a third - TO VAC what's causing this, and can you /20 party market that would make hard- suggest any solutions ? -B. FIG. 1 -BASIC AM TRAP. This trap can ware and software for use with IBM prevent Fishen, Albany, NY AM signals in the AC power line personal computers. IBM published from getting into audio equipment. This kind of interference can be a the specifications of the bus and

real pain in the neck to eliminate The schematic in Fig. 1 is a basic made them available to any compa- since there are several factors that AM trap for the power line that I've ny that wanted to go into the busi- can cause it. I can make a few sug- used with success. Remember to ness of making plug -in peripherals gestions, but I'm willing to bet that follow proper safety procedures for the IBM PC. This was the same you'll have to do a lot of work to when you're working with 120 volts strategy that had been successful make it disappear completely. AC. Put the circuit in a plastic box for Apple and others. The problem you're having is that and be sure to ground the trap prop- When the IBM -AT was developed something in your system is acting erly. AM signals are really pervasive around the 80286 processor, the as an antenna and introducing the and hard to eliminate. If the filter bus was expanded to 16 -bit width, AM signal into the input stage of shown here doesn't clean up the and the specifications were again your power amplifiers. The cable audio, try a commercial line filter as made available to anyone who want- running from your distribution ampli- the next step. ed them. Both the 8- and 16 -bit fier to the individual power ampli- buses were far from perfect in terms fiers is probably a standard audio MCA TO ISA ADAPTER of speed and signal availability, but cable with a single conductor and a I own an IBM PS /1 model 2121 - they did provide a standard for the shield. If I'm right about that, you E42 that has Micro Channel Ar- industry. should replace it with two- conduc- chitecture expansion slots on The bus was completely re- tor shielded cable and use the the motherboard. I would like to designed for 32 -bit machines, and shield as a chassis ground. use some ISA (Industry Stan- IBM started shipping computers The best way to find the source of dard Architecture) cards in the with the Micro Channel bus. This your problem is to disconnect the computer since they're less ex- was a good architecture that cor- inputs to the power amplifier and pensive, and there's also a much rected the shortcomings found in short them by connecting a short larger variety of them available. I the ISA standard, but the specifica- piece of wire from signal to ground need information about the pin tions and pinouts of the Micro at the back of the amplifier. If that assignments for the Micro Channel bus remained proprietary. kills the AM radio signal, you'll know Channel Bus, and would like to If you wanted to make cards for the that the cable from the distribution know how I could make some newer IBM PCs, you had to pay for amplifier is acting as an antenna. kind of an adapter. -R. Keats, the privilege. That means you'll have to replace Rexdale, Ontario This licensing and royalty require- the wire connecting the two. In its short life, the PC industry ment caused a lot of companies to I suggest that you try replacing hasn't had much time to generate stay away from the newer IBM PCs. the cable by just placing it on the the kinds of stories that go down in Remember that when IBM switched floor before you go to the trouble of history, but IBM's switch to the to Micro Channel, the clone and routing it through the walls. If this Micro Channel Bus is certainly compatible industry had taken on a solves the problem, you've got something that will be discussed in life of its own. There was some con- some rewiring to do. If you're still MBA classes for years to come. fusion about a new standard but, getting the AM signal, then the When the original PC was de- after some time, the EISA (Ex- chances are it's sneaking in through veloped in the early 80's, its bus tended Industry Standard Architec- the power line. Then only way to get allowed for expansion. The design ture) and VESA (Video Electronics 10 rid of it is to use a power-line filter. of the PC followed the path pre- Standards Association) standards

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When- It's TEL REGISTER WITH PRINTER. clear now that the Micro ever a high is presented to the base Records dialed number, duration, and Channel Bus, no matter how good a of Q1, the resulting low at its collec- prints record. 16 -digit display with bus it is, will remain exclusively IBM, tor pulls enough current through R1 security lock control. Stores up to 40 and it's unlikely that it will be a stan- to turn on Q2. Using two transistors calls.$149.00* dard for anyone but IBM. Since is a good idea because Q1 not only TEL REGISTER W/O PRINTER. there are licensing and royalty fees does the inversion needed to prop- Records dialed number and time. that are associated with it, any third- erly control Q2, but it also acts as a 16 -digit display. Holds up to 145 num- party product made for the Micro buffer to isolate the bers in memory. $99.00' control logic Channel bus will necessarily be from the power supply. 12 -HOUR LONG -PLAY RECORDER. more expensive than a similar prod- The component in the circuit Modified Panasonic. Records 6 hrs. uct made for the ISA bus. And, as whose value is critical is R1. It on each side of 120 tape (supplied). has to long as the Compatible with VOX and Tel Rec specifications for the pass enough current to turn on Q2. Adapter. $119.00* Micro Channel bus remain proprie- However, it's easy to calculate the tary with IBM, you won't be able to value for R1. You'll VOX VOICE -ACTIVATED SWITCH. need about 50 Makes recorder self- activating with find the pin assignments in the refer- milliamperes of current to turn on voices or other sounds. Great for ence section of your local library, or Q2, and the value of R1 can be de- radios and scanners. Provisions for adapter cards on the shelves of termined from Ohm's law as follows: mike external and /or patch cord. your local computer store. R1 = VUNREG milliamperes $28.50** /50 You can see from the schematic TELEPHONE RECORDING ADAP- REGULATOR SWITCH that all the regulator current must TER. Records incoming and outgoing I'm using several 78xx series pass through Q2, so make sure you calls. Use of handset controls three -terminal reg- use a part recorder and records both sides of voltage that can handle whatever conversation. $28.50' ulators in a circuit that I built, current your circuit is going to draw. and I need a way to turn them on It would be smart to heatsink Q2 TELEPHONE as SCRAMBLERS. Over and off with logic level well. 51,000 separate codes; impossible to signals break code. Assures utmost privacy. that are generated by another $295.00* part of the circuit. I don't want to IS IT SAFE? use a brute VOICE CHANGER. Changes man's -force approach with I'm thinking of buying a larger voice to lady's and vice versa. 4 sep- relays, so please tell me how to hard drive for my computer, and arate settings. Ideal for disguising do it with soliid -state devices. - am intrigued by the possibility voice. $29.95** D. Ketting, St. Louis, MO of using disk -doubling software RF BUG DETECTORS, There's no internal circuitry in the to let me increase the amount of AND MUCH MORE 78xx series devices that can turn storage. I could get 340 mega- For Shipping and Handling add '$5.00 and them on and off. I don't know why bytes with a 170 "$2.00 per item. Colo. residents add sales tax. -megabyte Mail.Order. VISA, M /C, COD's o.k. Inquire for you're against using relays but, drive, 420 megabytes from a dealer prices. Free catalog. since you are, you'll see it's also 210- megabyte drive, and so on. TOLL FREE 1- 800 -926 -2488 simple to control them with a tran- Is this kind of software safe to sistor. use ? -P. Murphy, Victoria, NJ A.M.C. SALES, INC. The schematic in Fig. 2 gives you Data -compression software has 193 Vaquero Drive the basic idea Boulder, CO 80303 of how to control any become really popular in the last Tel: (303) 499 -5405 of these regulators with logic sig- couple of years, and will probably be Fax: (303) 494 -4924 nals. Both transistors are set up as used for years to come. Although 12 Mon -Fri 8 a.m. - 5 p.m. Mtn. Time simple switches, and their opera- Continued on page 82

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RADON MONITOR REVISITED anode wire collects only about one - I would very much like to see col- There were several errors in the quarter of those electrons because leges take the approach that in- article "Radon Monitor" published it is essentially at ground potential; structors are like supervisors at in the January and February 1994 most are attracted to the ends of work, and the students must learn issues of Electronic Now. In Fig. 4 the can, which are also at ground to function in the real world. A (voltage tripler, Jan, p. 61) diode D2 potential. school environment, where there is should be reversed. In Fig. 10 Alpha particle ionizations can oc- less pressure, is the ideal place to (power supply, Feb, p. 70) resistor cur anywhere within the chamber, teach students what the industry R3 should be 3.3- kilohms. but only those electrons released expects from them. Almost any general purpose near the middle of the chamber are Most people in industry don't JFET can be substituted for the Na- likely to be attracted to the anode seem to know who (or what) they're tional Semiconductor J201 spec- wire. As a result, the can's vol- hiring. Someone should clarify the ified for Q1 in Fig. 2 (Jan, p. 58) umetric efficiency is only about 25 difference for them between a fac- provided the drain resistor is se- or about one -quarter of its phys- tory technician (the person who lected as described on page 62. For ical volume. specializes in troubleshooting, test-

example, the 2N3819 (Radio I gave a calibration constant of 1.9 ing, and repair) and a laboratory Shack) will work if R1 is 510 ohms. for k /(n x VE) in the article, but technician (who can do basic design However, the ON resistance of some based on a year of additional field work, solder, and keep an engineer-

JFETs could be so low that it would testing, I now I believe that constant ing notebook). cause excessive power drain. should be 2.1. I was trained as a laboratory tech- In Fig. 6 (pulse -rate counter, Jan, Experimenters should be sure to nician. During my last year in col- p. 67), any matched general pur- subtract the background (or out- lege, my final exam required that I pose JFETs can be substituted for door air) count rate from the indoor design and build simple circuit pro- the two 2N5566 JFETs, Q4 -a and rate when calculating actual radon totypes. That kind of exam encour- Q4 -b, (including the 2N3819) with- concentration: ages technicians to decide if they out affecting temperature drift sig- Radon (pCi /I) = 2.1 (indoor rate - prefer to work in a laboratory or in a nificantly. However, it might be outdoor rate) factory. Those who choose the lab- necessary to substitute different I'll be happy to answer any further oratory are taught basic circuit de- values for resistors R10 and R13 to questions about the Radon Monitor sign concepts. zero the meter properly if the JFETs from readers directly by mail. Please Companies such as Motorola of- are not closely matched. include a self- addressed, stamped fer semiconductor data manuals to Also in Fig. 6, one section of an envelope. PAUL NEHER colleges free of charge. All an in- LM324 quad op -amp (Radio 1016 Shack) Engler Road structor need do is write to the corn - used as a comparator can replace Las Cruces NM 88005 pany on college letterhead paper the LM392 specified. (Disable its and specify the number and titles of unused sections by grounding their IMPROVING TECHNICIAN the manuals he wants. inputs. TRAINING I would like to encourage more It is not necessary to remove all of I read with great interest Larry college instructors to do that. If the the plastic coating from the inside Steckler's editorial in the March is- teacher explained to the students surface of the cathode sleeve: The sue of Electronics Now. As an elec- what components are available and sleeve is conductive enough to al- tronics engineering (laboratory) how to work with actual component, low charge combination. Remove technician, there are a few points their learning would be enhanced. only enough to assure a sound high - that I would like to contribute to the Students of electronics tech- voltage capacitor connection. discussion. nology face two main stumbling In response to a question about In my college, certain basics, blocks in school -lack of money for the effective volume of the bev- such as soldering techniques, wir- building circuit projects and lack of erage can chamber, it is considering, and circuit layout (for prototype access to information about how to ably smaller than the physical construction), were not taught. build them. If, at least, basic elec- volume of the can. The reason for Teachers apparently thought that tronic components (such as stan- this is: those skills would be taught in in- dard resistors, logic-gate, and timer Free electrons, from alpha parti- dustry. But after graduation, I found ICs) were made more readily avail- cle ionizations, are repelled by the that employers were annoyed that able to students, I think that their negatively charged cathode toward technicians weren't taught those learning would skyrocket. 16 any relatively positive surface. The skills in school. It might take a combination of two

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www.americanradiohistory.com Earn Your B.S. Degree in approaches to get my ideas accept- tion- matching a low- impedance ed. The first, borrowed from high - microphone to a high- impedance in- ELECTRONICS school lunch programs, is subsidies put -would give very poor results. or for students for buying compo- It is apparent that Mr. Bith is al- nents. The second would be for ready experiencing hum as well as COMPUTERS manufacturers to offer sample corn - low -level output. The amplifier ponents to students free of charge. would raise the microphone's out- That policy would be good public put level, but I believe the hum relations, and the companies could would be increased proportionally. write off the expense as advertising. High- impedance microphones Along with the components made have two disadvantages. First, mi- available at no cost to students, the crophone lines tend to pick up 60- manufacturers could include copies Hz hum, which can be induced in the of any recently superseded data microphone cable line and /or its ex- books that they would normally tension. Second, long microphone throw away. lines will drastically reduce high -fre- By the way, what happens to all quency response because of the those outdated issues of elec- effective capacitance between the tronics magazines that the news- center conductor and shield. By Studying at Home stands don't sell? I'd suggest that Both of those drawbacks are Grantham College of Engineering, they be shipped off to the elec- eliminated with low- impedance mi- now in our 43rd year, is highly ex- tronics schools instead of being crophones having a balanced line perienced in "distance education" - thrown away. Rather that take a loss input. Generally, that means the use teaching by correspondence- through for magazines that are not sold, the a microphone transformer. That printed materials, computer materials, publisher could write off the ex- transformer then accepts any in- fax, and phone. pense as "educational assistance." duced voltage on one line and bal- No commuting to class. Study at I'm sure there are plenty of other ances it out with an equal but your own pace, while continuing on good ideas out there for encourag- opposite voltage on the other line. ing electronic your present job. Learn from easy -to- technician training, Moreover, interconductor capaci- but I understand but and think these make a good start. tance, while not reduced, has vir- complete thorough KLAUS lesson materials, with SPIES tually no effect on the low additional help Niles, from our instructors. IL impedance involved. Another ap- Our Computer B.S. Degree Pro- proach takes advantage of the im- gram includes courses in BASIC, pedance switch found on most low - LCD PANEL REPAIR PASCAL and C languages as well as impedance microphones by allow- - In response to the Q&A inquiry Assembly Language, MS DOS, CADD, ing them to be switched to high. If titled "Dangerous Cleaner" (Elec- Robotics, and much more. that is done, use a single- conductor, tronics Now, February 1994), it high- impedance cable because has Our Electronics B.S. Degree Pro- might be possible to repair a broken lower I gram includes courses in Solid -State capacitance. hope this sug- LCD panel. If you can see the LCD gestion helps. Circuit Analysis and Design, Control segments while rotating a pair of Systems, Analog/ DWIGHT EGGLESTON Digital Communica- polarized sunglasses over the dis- tions, Hendersonville, NC Microwave Engr, and much more. play, it can probably be fixed easily. An important part of being pre- Buy a low cost item with a small COMPLEMENTARY PAIR PREAMP pared to move up is holding the right LCD display such as a game (about Thank you for presenting Ray college degree, and the absolutely neces- $6) and remove the tin -oxide coated Marston's article, "Audio Ampli- sary is part knowing your field. polarizing sheets from the front and fiers" (Electronics Now, March Grantham can help you both ways - back. Place the appropriate sheet in 1994). I have long been interested in to learn more and to earn your degree front of the LCD panel in the proper audio circuits, especially those con- in the process. orientation, and you're set. taining discrete transistors. Over Write or phone for our free I repaired an LCD watch this way. the years, I've enjoyed reading arti- catalog. Toll free, 1- 800 -955 -2527, or Its polarization coating was partially cles on this subject in Electronics rn see mailing address below. removed because of a cracked crys- Now and before that in Radio-Elec- tal and exposure to steam. tronics. Accredited by RON DOZIER However, I can't recall seeing my o the Accrediting Commission of the Wilmington, DE favorite audio preamplifier Z National Home Study Council circuit U before -the complementary pair IMPEDANCE MATCHING shown in Fig. 1. Here are some of its GRANTHAM I would like to respond to M. benefits: high input impedance (ap- Bith's question that appeared in proximately R1) and a low output w College of Engineering Q&A in April. Speaking from experi- impedance (significantly lower than 18 Grantham College Road ence, I believe that Q&A's sugges- Continued on page 82 Slidell, LA 70460

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CITY STATE ZIP I I I I I I I I I I I I Acct. # I I Allow 6 to 8 weeks for delivery of first issue. U.S. Funds only. IMher add S7.5n HnlaUL In Canada add S6.674 I'o I'H c (Includes LLS.TI. All Fweign 19 Signature Exp. Date IL -u www.americanradiohistory.com EQUIPMENT REPORTS BDM40 Benchtop Digital Multimeter

locks into various positions making When performing the DMM very easy to position. The benchtop troubleshooting power cord plugs into the back of the meter in or repair, it's best to use test and, when not use, can be wrapped around two plastic lugs equipment intended for molded onto the case. The back of benchtop use. the instrument, or the bottom depending on how you look at it, has CIRCLE 14 ON FREE INFORMATION CARD two wide rubber feet that allow the DMM to stand in a vertical position.

Most readers of this maga- put. The unit should also have a dis- Measurements zine are familiar with play that's easy to read from as wide Four input jacks are provided on bench testing; its a es- an angle as possible. The liquid - the front panel: volt /ohm, common, sential part of working with elec- crystal display on a portable DMM and 2- and 20- ampere current. The tronics. For infrequent testing, a conserves battery power, but it can test probes must be plugged into handheld multimeter might be suffi- be hard to see from wide angles. the different jacks, depending on cient. However, anyone who is Because battery power con- whether current or voltage and re- doing bench testing day-in and day- servation is usually not a concern at sistance is to be measured. A red out needs test equipment better the test bench, power-hungry LED push -on, push -off switch turns the suited for benchtop use. displays, which are much easier to power on and off. A handheld multimeter is the per- see, are practical. The DMM can measure AC volt- fect tool for general -purpose test- age to 1000 volts in 200 -millivolt, 2- ing both because of its versatility The Wavetek BDM40 volt, 20 -volt, 200 -volt, and 1000 -volt and portability. It can be a techni- When buying a benchtop DMM ranges. The true -RMS function is cian's "Swiss Army knife " -a real it's a good idea to find one that pushbutton -enabled for AC and lifesaver for countless unexpected strikes a happy median between AC + DC coupled measurements. repairs. But you would never see an price and performance -an exam- DC voltage measurements can be auto mechanic repairing a car with a ple is the model BDM40from Wave - made in the same ranges up to 1200 Swiss Army knife-there are better tek Corporation (9045 Balboa volts. tools for the job. Similarly, although Avenue, San Diego, CA 92123, Alternating and direct current (AC a TV service center might have a 619 -279 -2955). This 41/2- digit, true - and DC) can be measured in 200 - few handheld multimeters in its RMS benchtop DMM has a list microampere, 2- milliampere, 20 mil- equipment arsenal, you are sure to price of $429. liampere, 200 milliampere, 2 -am- find benchtop test instruments The BDM40 can measure AC and pere, and 20- ampere ranges. Two being used for benchtop testing. DC voltage in five ranges to 1200 current -input jacks are provided on Benchtop test equipment is usu- volts, AC and DC current in six the front panel of the unit; one is for ally intended for making only a few ranges to 20 amperes, and resis- measurements up to 2 amperes, specific kinds of tests. However, it is tance in six ranges to 20 megohms. and the other must be used for cur- generally capable of making those It can also test diodes. Each mea- rent measurements between 2 and measurements with greater ac- surement range has automatic po- 20 amperes. curacy and precision than handheld larity detection, overrange indica- Resistance can be measured in units. Traditional digital multimeter tion, and overload protection. All of six ranges: 200 ohms, 2 kilohms, 20 (DMM) functions are the measure- the measurement functions are en- kilohms, 200 kilohms, 2000 kilo - ment of AC and DC voltage, AC and abled by interlocking pushbuttons, hms, and 20 megohms. In the first DC current, and resistance. While and the LED display characters are two ranges, the value of lead resis- some handheld units might boast a Y2 -inch high. A pair of test leads, tance will show up on the display. ten times that number of features, two spare fuses, and an instruction The 4Y2-digit (20,000- count) dis- the additional features usually lack manual are included in the price. play can register measurements the precision and operating range The BDM40 is housed in a rug- from 0000 to 19999. The polarity of for professional work. ged gray plastic case that measures the input signal is indicated by the A person who uses a DMM every about 10 inches wide by 12 inches appearance of a sign on the left side day wants a unit that's easy to posi- long. The rubber-cushioned carrying of the display. The position of the 20 tion on a test bench and that stays handle also doubles as a bail that Continued on page 77

www.americanradiohistory.com Countersurveillance

Never before has so much The professional discussions seen on professional information on the art CALL the TV screen in your home reveals how of detecting and eliminating NOW! to detect and disable wiretaps, midget electronic snooping devices -and radio -frequency transmitters, and other to how to defend against experienced bugs, plus when to use disinformation and the information thieves -been placed confuse the unwanted listener, technique of voice scrambling telephone in one VHS video. If you are a communications. In fact, do you know Fortune 500 CEO, an executive in how to look for a bug, where to look for a or a novice any hi -tech industry, bug, and what to do when you find it? an honorable. HAMM seeking entry into Bugs of a very small size are easy to E13SSaFt84Q\!16 rewarding field of work in LiSTENIN6 build and they can be placed quickly in a countersurveillance, you must matter of seconds, in any object or room. view this video presentation again Today you may have used a telephone and again. handset that was bugged. It probably contained three bugs. One was a phony Wake up! You may be the victim of bug to fool you into believing you found a stolen words -precious ideas that would bug and secured the telephone. The sec- have made you very wealthy! Yes, profes- ond bug placates the investigator when sionals, even rank amateurs, may be lis- 1- 516 -293 -3751 he finds the real thing! And the third bug tening to your most private con- is found only by the professional, who versations. HAVE YOUR continued to search just in case there were Wake up! If you are not the victim, VISA or MC CARD more bugs. then you are surrounded by countless vic- AVAILABLE The professional is not without his tims who need your help if you know how tools. Special equipment has been de- to discover telephone taps, locate bugs, or what was to be an embassy and private signed so that the professional can sweep "sweep" a room clean. residence into the most sophisticated re- a room so that he can detect voice -acti- There is a thriving professional service cording studio the world had ever vated (VOX) and remote- activated bugs. steeped in high-tech techniques that you known. The building had to be torn Some of this equipment can be operated can become a part of! But first, you must down in order to remove all the bugs. by novices, others require a trained coun- know and understand Countersurveilance tersurveillance professional. Technology. Your very first insight into Stolen Information The professionals viewed on your tele- this highly rewarding field is made possi- The open taps from where the informa- vision screen reveal information on the ble by a video VHS presentation that you tion pours out may be from FAX's, com- latest technological advances like laser - cannot view on broadcast television, sat- puter communications, telephone calls, beam snoopers that are installed hun- ellite, or cable. It presents an informative and everyday business meetings and dreds of feet away from the room they program prepared by professionals in the lunchtime encounters. Businessmen need snoop on. The professionals disclose that field who know their industry, its tech- counselling on how to eliminate this in- computers yield information too easily. niques, kinks and loopholes. Men who formation drain. Basic telephone use cou- This advertisement was not written by can tell you more in 45 minutes in a pled with the user's understanding that a countersurveillance professional, but by straightforward, exclusive talk than was someone may be listening or recording a beginner whose only experience came ever attempted before. vital data and information greatly reduces from viewing the video tape in the pri- the opportunity for others to purloin vacy of his home. After you review the Foiling Information Thieves meaningful information. video carefully and understand its con- Discover the targets professional r tents, you have taken the first important snoopers seek out! The prey are stock CLAGGK INC. EN step in either acquiring professional help brokers, arbitrage firms, manufacturers, P.O. Box 4099 Farmingdale, NY 11735 with your surveillance problems, or you any may very well consider a career as a coun- high -tech companies, competitive Please rush my copy of the Countersurveillance Techniques industry, or even small businnesses in the Video VHS Cassette for a total cost of $53.95 each (which tersurveillance professional. same community. The valuable informa- includes S4.00 postage and handling). tion they filch may be marketing strat- No. of Cassettes ordered The Dollars You Save egies, customer lists, product formulas, Amount of payment S To obtain the information contained in tax (N.Y.S. only) manufacturing techniques, even adver- Sales the video VHS cassette, you would attend Total enclosed $350 -750 tising plans. Informati ')n thieves eaves- Bill my VISA MasterCard a professional seminar costing drop on court decisions, bidding Gard No. and possibly pay hundreds of dollars more information, financial data. The list is Expire Date if you had to travel to a distant city to unlimited in the mind of man-es - Signature attend. Now, for only $49.95 (plus Name $4.00 P &H) you can view Countersur- pecially if he is a thief! Address You know that the Russians secretly (äty State ZIP veillance Techniques at home and take views often. To obtain your installed countless microphones in the All payments in U.S.A. funds. Canadians add 34.00 per VHS refresher call . concrete work of the American Embassy cassette. No foreign orders. copy, complete the coupon or 21 building in Moscow. They converted J

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slave outlet to control more VGA -TO -NTSC CONVERTER. than one appliance. The VideoOut plug -in card In the automatic position and software from the MasterSwitch International Computers functions normally, but a allows the images on a manual position overrides computer screen to be dis- the circuitry and turns on played on a television the slave outlet whenever monitor or be saved to vid- desired. The maximum cur- eotape for a VCR. Capable rent rating for each outlet is of displaying text and 4 amperes (480 watts). graphics and both black Plans, instructions and and white and color circuit board patterns for screens, it can be used to building your own create demonstration vid- MasterSwitch is priced at eotapes and instructional CIRCLE 20 ON FREE INFORMATION CARD $7.50. That Documenta- videos. VideoOutworks on tion with a printed circuit any IBM PC /XT /AT or med to convert the video plugged between the VGA board is priced at $14, and compatible computer with signal to NTSC timing. card and the bottom con- a kit with all documentation a VGA display adapter. If VideoOut supports both nector of VideoOut. An ad- and parts is priced at $39 the VGA card can send in- text and graphics modes. It ditional cable included con- plus $4 S &H. A fully as- terlaced signals, VideoOut contains a lookup table for nects the VideoOut card to sembled and tested unit is can display them on a tele- determining the proper ad- the television, monitor, or priced at $49 plus $4 S &H. vision monitor in 480 -line dressing and mode number VCR. California residents add resolution. It will also work for the VGA installed. It The VideoOut 4.2 x fl- 8.25% sales tax. with non -interlacing VGA also identifies the specific inch plug -in board, two ca- Progressive Concepts cards. board's manufacturer auto- bles and connectors, 1313 North Grand Avenue VideoOut includes a matically. user's manual, and soft- Suite 291 board that functions as a The card is installed in ware diskettes are priced Walnut, CA 91789 pass- through for the VGA the computer, and the ca- at $99. Phone: 909 -626 -4969 video signals. A program ble from the VGA card is International Computers remains resident until the unplugged and plugged 12021 West Bluemound hot key is pressed for start- into the top connector of Road 12 -DIGIT UNIVERSAL COUN- up. The registers on the VideoOut card. The VGA Wauwatosa, WI 53226 TER. Hewlett-Packard has VGA card are reprogram- cable provided is then Phone: 414 -764 -9000 increased the resolution of its universal- counter family by 12- digits per second AC SWITCHING DEVICE. The justable with a sensitivity with its introduction of the MasterSwitch with master control. That control can HP 53132A 225 -MHz uni- and slave AC outlets per- cause the unit to ignore low versal counter. It is able to mits you to turn on your current being drawn from make high -resolution mea- television with your remote the master outlet. The surements in a fraction of control while it turns on MasterSwitch also in- the time required by con- your stereo or amplifier au- cludes an auto /manual ventional counters. This tomatically. Now you can switch. feature can speed up prod- hear television sound CIRCLE 21 ON FREE The MasterSwitch uct testing and trou- through your stereo sys- INFORMATION CARD works in most situations bleshooting in computer- tem with one convenient where you want the on and controlled systems whose remote control setting. on /off status of the device off function of one or more data transfer rate exceeds Any electrical appliance which is plugged into the appliances controlled by a 200 fully formatted mea- plugged into the slave out- master outlet. The current master appliance. A three - surements per second. let will automatically switch level threshold at which the way tap or a power strip In addition to typical uni- on or off depending on the slave outlet switches is ad- can be plugged into the versal- counter measure-

www.americanradiohistory.com HIGH -BRIGHTNESS LED'S. The red LED lamp in Rohm Corporation's SLA -570 Series provides luminous .9/GHT intensity of up to 2400 milli - candelas (mcd) at 20 milli- rArr amperes, while a green LED lamp emits up to 750 CIRCLE 22 ON FREE mcd. Both LED lamps have INFORMATION CARD 24° viewing angles. They are said to be suitable for ments, such as frequency, illuminating airport terminal period, and time interval, and stadium signs and the- the HP 531324 can mea- ater marquees. Their use sure pulse parameters, will avoid the cost and time AN IMPORTANT PART duty cycle, and frequency required to replace incan- OF YOUR PHOTOCOPIER ratios. Built -in statistical descent lamps in those and mathematical func- lighting applications. ISN'T PART OF tions allow the user to dis- YOUR PHOTOCOPIER play scaled measurement data. An optional third Having a machine may not permit you to photocopy channel is available that books, journals, newsletters and magazines. can measure frequency up The Copyright Clearance Center CAN. to 3 gigahertz. Contact us to find out Automatic limit testing how you too can COPY RIGHTISM permits the setting of upper and lower boundaries COPYRIGHT CLEARANCE CENTER on any measurement. An CIRCLE 23 ON FREE 222 Rosewood Drive, Danvers, MA 01923 D'&1. (508) 744.3350 Fax (508) 741.2318 analog display mode INFORMATION CARD 1993 Copyright Clearance Center speeds testing by allowing © users to see if a measure- The red gallium phos- ment falls within pass /fail phide LEDs have typical limits. forward voltages of 1.75 The counter logs and volts, and they dissipate NEXT MONTH IN flags out -of -limit condi- 100 milliwatts; equivalent tions, and it can generate values for green gallium an output signal to trigger aluminum arsenide LEDs external devices when a are 2.3 volts and 75 milli - Electronics limit is exceeded. A single watts. Both are rated for keystroke recalls up to 20 100,000 -hour MTBF. NOW The August, 1994, issue is a real winner. The different panel setting that Red SLA -570 LEDs are are jam packed with articles like: were stored after the in- priced at less than $.07 pages strument was set up for a each, and green LEDs are COMMERCIAL EDITOR specific application. priced at less than $.125 Zap those annoying commercials A standard HP-IB port each when purchased in from your video tapes. provides full SCPI -com- quantities of 10,000. RESTORE IT CORRECTLY Rohm Corporation patible programmability, Doing it right with vintage audio gear. and a standard RS -232 3034 Owen Drive (talk only) interface pro- Antioch, TN 37013 EPROM PROGRAMMER work. vides printer support or Phone: 615- 641 -2020 Put the IBM PC input/output breadboard to data transfer to a computer Fax: 615- 641 -2022 CIRCUIT NOTEBOOK through a terminal- emula- All about low- voltae converter circuits. program. tion Plus additional interesting articles, columns The HP 53132A univer- UNDERWATER METAL DE- and departments on topics covering theory and with TECTOR. The Impulse metal sal counter, complete equipment servicing. operating, service, and detector from Fisher Re- programming manuals and search Laboratory is in- The August 1994 Issue is on Sale a power cord, is priced at tended for shoreline and JULY 5, 1994 underwater treasure hunt- $2400. for it! Hewlett Packard Company ing. Based on pulse induc- Watch Hanover Street tion (PI) circuitry, it has the Pick Up Electronics Now at your favorite Newsstand, 3000 Convenience Store, Bookstore or Supermarket Palo Alto, CA 94304 ability to detect metal (in- 23

www.americanradiohistory.com volts rms. It is rated at 200 based data -acquisition MHz, and includes fully system. They were de- insulated leads and an signed for use with bridge insulated BNC connector transducers that measure for direct interface. force, load, pressure, ac- Pomona has also intro- celeration, flow, stress, and duced an new family of gain. The pods allow a sen- switchable (1X /10X) be CIRCLE 24 ON FREE insu- sor to digitized and con- INFORMATION CARD lated probes that are sold trolled over a serial RS -232 separately. The Model interface. CIRCLE 27 ON FREE cluding gold and silver) in 6035 has a non -slip handle The A/D pods do not de- INFORMATION CARD salt water and black sand. and a slide switch for the pend on amplifiers to per- Both of those materials are probe's attenuation range. mit the reading of low -level less than two pounds. Be- seen as targets by most A non -switchable Model signals. An A/D pod is se- cause its wind load is only metal detectors. 6006 is also sold as a sepa- lected with a full -scale in- 0.725 square feet, light - The detector's transmis- rate item. put voltage range that duty rotors can be used. sion frequency is 5,333 closely matches the output The antenna covers both pulses per second. A volt- voltage range of the trans- the 144- to 148 -MHz and age- controlled oscillator ducer. Each pod contains 430- to 450 -MHz bands. provides audio target re- an A/D converter IC and The A270 -10S yagi array sponse through a voltage reference tuned to is priced $99. piezoelectric headset. An the required full -scale input Cushcraft Corporation LCD bargraph displays sig- range. 48 Perimeter Road nal strength and battery A/D Pods have full -scale Manchester, NH 03103 condition. The detector inputs between 100 milli- Phone: 603 -627 -7877 can have an 8- or 10 -inch volts and 2.0 volts. The A/ Fax: 603 -627 -1764 spider coil with a 7 -foot ca- D IC offers ± 18 bits with ble. Alkaline AA power 25 % overrange. The pod's cells provide up to 100 TVIHOST data -acquisition DC POWER SUPPLY. B +K's hours of service. CIRCLE 25 ON FREE software will run on com- Model 1688 3- to 14 -volt The Impulse can with- INFORMATION CARD puters with PC -DOS and DC power supply is intend- stand depths up to 250 Unix operating systems. ed to replace a 12 -volt auto- feet. It has two control The 6035 is priced at The A/D Pod Senior motive battery for continu- knobs: a threshold tone $95 each, the Model 6006 starter kit which includes ous duty operation. It can control sets the tuner for is priced at $75, and Model eight A/D Pods, one PC- power mobile electronic maximum sensitivity, and a 6033 kit is priced at $125. interface module, soft- equipment such as mobile volume control, which is ITT Pomona Electronics ware, "C" driver source cellular phones, car ster- also an on /off switch, ad- 1500 East Ninth Street code, all necessary cables, eos, and amateur radios. justs headset volume. Pomona, CA 91766 -3835 and power supply is, priced The Model 1688 avoids The Impulse underwater Phone: 909 -469 -2900 at $6,495. The A/D Pod concern for acid leaks from metal detector is $900. Fax: 909 -629 -3317 Junior starter kit which in- 12 -volt automotive bat- Fisher Research Laboratory cludes four A/D Pods is teries, does not need re- Department EN priced at $4195. charging, and can tolerate 200 West Wilmott Road PC -BASED DATA- ACQUISI- TechnoView, Inc. short -circuited loads. It Los Banos, CA 93635 TION AND PROCESS -CON- 98 Baycrest Court produces 35 amperes Phone: 1- 800 -M- SCOPE -1 TROL TOOL. TechnoView's Newport Beach, CA (nominal) and a maximum A/D Pods combine the 92660 -2922 of 25 amperes at 13.8 volts functions of a 71/2 to 8'h- Phone: 714 -854 -5559 volts DC, continuously, INSULATED PROBES. Os- digit voltmeter, a digital out- without overheating. cilloscope probes from ITT put card, and a multichan- Output voltage of the Pomona are intended as re- nel personal computer- DUAL -BAND YAGI. placements for factory - Cushcraft's A270 -10S supplied probes for Fluke dual -band Yagi array for ScopeMeter 90 Series, two meters and 70 cen- TechnoView Leader Model 300, and timeters provides the gain AID Pod Srta Hitachi 5025 handheld os- 6,1k and directional charac-

GPND - cilloscopes. .1, teristics of a Yagi array with The 6033 Scope Probe the convenience of a dipole Kit includes a paired set of antenna. Model 6006 10X probes The boom for the (red and gray) with over- CIRCLE 26 ON FREE A270 -10S is six feet, two CIRCLE 28 ON FREE 24 voltage protection to 360 INFORMATION CARD inches long, and weighs INFORMATION CARD

www.americanradiohistory.com Model 1688 can be varied outer conductor with re- secure, yet can be recon- from 3 to 14 volts DC. Cur- movable SMA connectors. figured in minutes. Cut -off rent and voltage can be The basic core has a frequencies range from monitored simultaneously characteristic impedance 500 MHz to 5.0 GHz with on separate analog of 100 ohms. Transmission - up to 11 sections. Typical meters. The outputs are line segments placed over insertion loss is 0.2 dB at 1 fully isolated, so either out- the core provide charac- GHz and 1 dB at 5 GHz. Its put terminal can be floated teristic impedances of ei- maximum power require- or grounded. ther 50 or 20 ohms. The ment is 10 watts. All com- The Model 1688 DC segments can form a ponents except the core CIRCLE 30 ON FREE power supply is $299. stepped- impedance tu- are reusable and they are INFORMATION CARD B + K Precision Corp. bular filter. There can be designed to last for at least video or data cable 6470 West Cortland Street from three to 11 segments. 100 filter responses. More tify any Chicago, IL 60635 Each segment of transmis- than 50 cores are included. equipped with nine -pin, D- Phone: 312 -889 -1448 sion line is attached to the The Shape Shifter SL55 type subminiature cable Fax: 312- 794 -9470 core with a special crimp- kit, including instructions connectors. ing tool. and all necessary tools is Twenty LEDs verify ca- priced at $595. ble continuity, open and short circuits between con- LOW -PASS FILTER. The Shape Gavewave Gatewave, Shape Shifter Shifter Division of Parkview R &D, ductors, and shield ground. Inc. The tester has two modes: SL55 adjustable low-pass Filter Variable man- filter is intended for labora- 565 Science Drive continuous scan and tory use. It is sold as a kit Madison, WI 53711 ual step scan. with an assortment of Phone: 800 -797 -9283 The D -Sub 9 Cable Test- transmission -line seg- Fax: 608 -238 -5120 er is priced at $179.50. L-com, Inc. ments that are combined 29 ON FREE CIRCLE 1755 Osgood Street by sliding them onto a met- INFORMATION CARD al core which also serves SPECIALTY CABLE TESTER. North Andover, MA 01845 as the center conductor. A Connections are elec- L -com's cable tester can Phone: 800 -343 -1455 tubular jacket forms the trically and mechanically test for continuity and iden- Fax: 508-689-9484 2

VIDEO NEWS NEW Higher Performance continued from page 8 Probes from TPI! nents and video players will be the Faster same device," he added. They will risetimes be in "wallet -sized packages containing a digital recorder and player Sharper leading with 100 gigabytes of built -in memo- edges ry as well as removable cards on which programs can be down- All probes loaded." repairable As envisioned by Bermingham, New slimline the recorder /player of the future "will be battery- powered, and have design a small color viewing screen; it will Economical go from home to car to pocket." It replacements .sts will be able to digitally copy any soft- for all scopes ware from any electronic source, .- with "an embedded computer pro- TPI - Still the gram" keeping track of copied ma- industry leader! terial and routing royalties to the "appropriate copyright holders." Model SP100B Call for free catalog of probes to 500 MHz - All conventional recording media, Active Probes - Differential Probes - Test Leads "even those newest technologies, $45 and Accessories still involve mechanical devices," said, noting they are Bermingham 9178 Brown Deer Road San Diego, CA 92121 "conceptually identical to the tinfoil TEL: 619 -552 -2090 FAX: 619 535 -1260 recorder Thomas Edison dis- TEST Toll Free: 1- 800 -368 -5719 25 covered in 1877." s2 PROBES, INC. TPI

CIRCLE 123 ON FREE INFORMATION CARD www.americanradiohistory.com NEW LITERATURE

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A Field Guide to Windows JEDEC Style Integrated Cir- thousands of times their Icons: An Introduction to the cuit Package Trays; 3M Elec- own weight. Until recently, Commonest Icons in North tronic Products Division, these shape memory wires America; by Patricia C. 6801 River Place Blvd., Aus- were little known outside of Hedtke and John V. Hedtke. tin, TX 78726 -9000; free. the scientific laboratory. Osborne McGraw -Hill, 2600 This brochure describes The author of this project Tenth Street, Berkeley, CA 3M's full line of trays for book is the president of 94710; Phone: transporting integrated cir- Mondo- Tronics, Inc., the 510 -549 -6600; Fax: cuits in quantity. The bro- CIRCLE 339 ON FREE company that manufac- 510 -549 -6603; $7.95. chure discusses trays best INFORMATION CARD tures Muscle Wires' . Mr. Learn the Windows op- Gilbertson points out that ,Vet erating system while laugh- _,...,w.. focuses on consumer-elec- they are now finding ap- ....11]Nl'SRYI..Mpaiil`ew ing at the humor in this tronics products and hob- plications in teleoperated book that has a lighter look byist needs. manipulators, mini- and at Windows. By sending up Among the products de- micro -robotic devices, and the field -guide format famil- scribed in this 1994 catalog heat -actuated tools. They iar to bird -watchers, Win- are speakers and audio ac- can also actuate valves, re- dows learners at all levels cessories for home and lays, switches, circuit of computer experience car, audio products for breakers, and temperature will be able to identify CIRCLE 338 ON FREE home installation, profes- controlled devices. iconus vulgaris (common INFORMATION CARD sional audio equipment, icons), controllum pan - and repair parts and ac- ellum (control panel) and suited for high -, medium -, cessories for CATV and scribi microsoftii (Micro- and low- temperature en- VCRs. Other products soft Write). vironments. All of the trays available from Parts Ex- are designed to be corn - press include telephone patibile with JEDEC tray products, semiconductors, outline stacking dimen- tools, chemicals, wire, con- sions, and they are made nectors, computer ac- with dimensional toler- cessories, and educational ances that match those of books and videos. CIRCLE 340 ON FREE the IC packages. 3M will INFORMATION CARD design and manufacture non -standard trays to cus- Muscle Wires Project Book, The wires have been in- tomer specifications. Third Edition; by Roger G. cluded in prosthetic limbs This brochure includes Gilbertson. Mondo- Tronics, and heat -controlled medi- product specifications, pic- 524 San Anselmo Avenue, cal instruments. Neverthe- CIRCLE 337 ON FREE tures of the trays, ordering No. 107, San Anselmo, CA less, they are inexpensive INFORMATION CARD information, and a chart 94960; Phone: enough to be suitable for Each entry includes the presenting the properties 415 -455 -9330; Fax: animating dolls, toys, and icon's common name fol- of the plastic materials 415 -455 -9333: $17.95; book puppets. When included in lowed by its Latin name, used in making the trays for with Muscle Wires sample educational science kits distinguishing marks, customer selection. kit: $34.95; book with Mus- and made available for voice, a full description, cle Wires deluxe kit: home experimentation, and a single- sentence ex- $59.95. they offer unlimited pos- planation of what the icon 1994 Electronic Parts & Ac- This book discusses sibilities for amateur ex- really does. cessories Catalog; Parts Ex- Muscle Wires' , nickel -ti- perimentation. The book presents each press, 340 East First Street, tanium filaments that short- The author gives enough common icon in its "natural Dayton, OH 45401 -1257; en when they are elec- information in this book to habitat." The icon's at- Phone: 800-338 -0531. trically powered. When permit the reader to design tributes are examined, and This 188 -page catalog heated, they act like human and build his own elec- its individual peculiarities describes the Parts Ex- msucles. This charac- tromechanical and thermal - are noted with a naturalist's press line of electronic teristic gives them the abil- controlled devices with 26 eye for detail. components. The line ity to lift weights that are Muscle Wire' ".

www.americanradiohistory.com DC /DC Converters Applica- detailed instructions for 18 tion Note. Conversion De- Low-BANd DXimy inexpensive virtual- reality vices, Inc., 15 Jonathan do- it- yourself projects. Drive, Brockton, MA 02401; These range from adapting Phone: 508 -559 -0880; Fax: Nintendo PowerGloves 508 -559 -9288; free. and VictorMaxx 3D gog- This comprehensive, gles, to building your own eight -page technical note goggles, motion trackers, from Conversion Devices and 3D sound systems. Gradecki's book in- discusses applications for CIRCLE 342 ON FREE DC /DC converters in INFORMATION CARD cludes a diskette con- many different circuit containing all the software figurations. It also gives de- improve their on- the -air required to test, calibrate, CIRCLE 344 ON FREE signers advice on how to efficiency, whether they INFORMATION CARD avoid many common DC/ participate in DXing con- DC application problems. tests or not. plete range of audio inte- The topics discussed in grated circuits. It contains DeVoldere's book include detailed product descrip- specific antenna systems tions and discussions of that can improve station circuit functions. performance.Details about Among the topics cov- dipoles and vertical arrays ered in this data book in six are discussed. This guide CIRCLE 343 ON FREE product categories are: has been updated regularly INFORMATION CARD digital -to- analog convert- since it was first published ers, analog -to- digital con- in 1987. This latest edition and run the virtual reality verters, combined ADCs CIRCLE 341 ON FREE has and projects discussed in the and DACs, digital signal INFORMATION CARD been expanded, large sections have been book. It includes virtual processors and syn- The subjects in this ap- rewritten to make them worlds, which are accessi- thesizers, digital audio plication note include wir- more valuable to a wider ble with your mouse and transmitters and receivers, ing and making connec- reader base. computer monitor. Projects and volume controls. tions, grounding, input cir- The author has made in the book include "duck Data sheets are pro- cuits, output circuits, and use of the latest and most and fire" a robot combat vided for 23 products, in- the linking of multiple con- powerful computer analy- game that can be played cluding 11 new to this verters. Specific converter sis and modeling tools in over modems. edition, application notes, problems such as input the preparation of his sec- You can also play virtual and reprinted articles from transients and line drops tion on antennas. A revised reality racquetball in a real- the Audio Engineering So- are discussed. Circuit di- equipment review section istic virtual- reality court and ciety publications. agrams illustrate important includes recent product in- hook up a bicycle to your technical points. troductions. Another im- computer and pedal portant addition is a direc- through a virtual park. Mastering Electronics Math, tory of outstanding low - Other adventures includes Second Edition; by R. Jesse Antennas and Techniques band DX'ers. The listing in- lifting marble slabs and col- Phagan. Tab Books Inc., for Low -Band DXing: Your cludes their scores, and umns to build an ancient Blue Ridge Summit, PA Guide to Ham Radio DXcite- describes the equipment Greek virtual temple. 17294 -0850; Phone: ment on 160, 80, and 40 and antennas they have. Those readers with C pro- 800 -233 -1128; $17.95. as meters; by John Devoldere, gramming experience can This book was written ON4UN. The American Ra- make use of the informa- a guide to the understand- dio Relay League, 225 Main The Virtual Reality Con- tion in the book to generate ing of the mathematics Street, Newington, CT struction Kit; by Joe Gra- their own programs. most widely used in elec- It the prac- 06111; Phone: 203 -666 -1541; decki. John Wiley & Sons, tronics. covers Fax: 203 -665 -7531; $20. Inc., 605 Third Avenue, New tical calculations needed to This book offers the tips York, NY 10158 -0012; 1994 AUDIO DATA BOOK. design and troubleshoot as and techniques intended to $27.95. Crystal Semiconductor Cor- circuits as well test improve the performance This book allows you to poration, Literature Depart- basic components. of amateur radio operators immerse yourself in the ment, 4210 South Industrial Phagan has avoided the and help them win DXing subject of virtual reality re- Drive, Austin, TX 78744; heavy theoretical approach contests. Entry-level ama- gardless of your level of Phone: 512 -442 -7555, ext. taken in many mathemarics teurs as well as seasoned training and experience 254; free. books. His explanations amateur operators alike with computers, program- This 1072 -page data and sample problems that are can profit from the informa- ming or electronic circuits. book from Crystal Semi- illustrate each concept tion given in this book to The author has included conductors covers its com- Continued on page 83 29

www.americanradiohistory.com What Do These Prestigious Companies Have In Common?

OF Leadership in electronics is not Aerovoxe DALE m,.l4afa. just a matter of designing products better and DC film and RFISuppression Capacitors, Aluminum

AC manufacturing them better, but Electrolytic and Oil Capacitors, EMI filters Dale Electronics, Inc. Fixed Ceramic Capacitors, Variable Capacitors and Resistors, Crystal Oscillators, Ceramic Filters, Resistors, Networks, Oscillators, Displays, also of marketing them better. Resonators, EMI Filters, Hybrid Circuits and more. Inductors, Thermistors, Connectors, & And the sponsors of this Transformers AMP Panasonic message understand that better Electrical /Electronic Connectors, IC Sockets, I Industrial Company service to customers requires PCB Switches INDUSTRIES. INC. Resistors, Resistor Networks, Ceramic, film, Batteries: Computer, Cordless Phone, laptop, Electrolytic, Double layer Capacitors, effectively involving distributors Scanner, Alarm and Medical Potentiometers, Switches, Inductors, Filters, as part of their marketing M1l Antennas: Cordless Phone and Scanner Resonators, Variston, Thermistors RAD lingineering, Inc. teams. DEARBORN Motor Run Capactors, HID Lighting Capacitors, WIRE AND CABLE L.P. Philips Components Power factor Correction Capacitors rT` Phd,ps Electron,cs North America Corporation Distributor involvement means

Resistors, ferrite Components lower prices, quicker deliveries, Aluminum Electrolytic, Film & Ceramic Capacitors better service over-all. The E:T N Buyer wins...the Seller wins. Miniature Eaton Corporation, Commercial 'l'hc and Submmature Coaxial cii & Military Controls Operation Distributors help achieve Connectors and Cable Assemblies. thl'c)ul Switches, Relays, Displays and Keyboards marketing leadership. So does CORPORATION clitrihutc)rti. /MX the manufacturer's involvement

MCC, Tantalum and Thin Film Capacitors, Resistors, in the Components Group of Networks, Integrated Passive Components, 'Theyy he lcmg, ELECTRONICS the Electronic Industries Trimmers, Oscillators, Resonators, filters, Piero Quartz Crystals, Clock Oscillators, Surface Mount to) E.I.A. Devices, and Connectors Products. Programmable Devices Association. EIA fosters better Tly hult)n; industry relations, coherent GERNSBACK industry standards, and the BERG'E E I L C T R O N C S ()n yc)ur

T1 PUBLICATION sharing of ideas, which helps High Density and Industry Standard veiic.lcn- list. nectors Con /Subsystems Electronics Now Magazine one another and serves customers better. CAROL Quam GUARDIAN In choosing your component \> loudspeakers and Commercial Sound Products Electronic and Electrical Wire and Cable and Power Supply Cords Relays and Solenoids supplier, look for the marks of ROHM leadership -- KEMET Rohm Electronics Division Resistors, Ceramic Capacitors, Electronics Corporation availability through distribution Transistors/Diodes, Opto Components and K's Tubing, Conduits, H se, Sleevings, Splices, Multilayer Ceramic and Solid Tantalum membership in E.I.A. Insulation and Cabl Harness Products, Power Capacitors SE1ECT11j

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Electronic Industries MALLORY Association /Components Group Bussmann North American Capacitor Company 2001 Pennsylvania Avenue, N.W., Fuses, fuseholders, fuse Blocks, and fuse Tantalums, Aluminums, SonaltertsR Ceramics, Tantalum Capacitors, Wet & Foil Capacitors, 11th Floor Accessories Films and AC's Resistor Networks, Resistor Capacitor Washington, D.C. 20006 Networks, Filters Phone: (202) 457 CORNELL -4930 Switolscraft Fax: (202) 457 -4985 DUBILIER Mtron A IllaNloomme Company Committed to the competitiveness Capacitors- Aluminum Electrolytics, Mica, Quart Crystal Switches, Connectors, Jacks, Plugs, Jackfields & the 30 AC Oil, Film, MICA Paper and Relays Hybrid Oscillators Audio Accessories, Cable Assemblies of American electronics producer.

www.americanradiohistory.com RADIO AMATEURS HAVE BEEN com- municating with two -way television for years, but their equip- Build this ment was so expensive that it cost more than most amateurs could afford. However, recent advances in solid -state technology have drastically reduced the prices of the necessary components for amateur television (ATV) and made them availabl" - 111% ti. to a far wider group of amateur operators. 4 0 lbday, many key components in ATV systems that were once either prohibitive in cost or un- Build your available are now stock items. These include VCRs, camcor- permits ders, low- priced, quality color WILLIAM SHEETS TV receivers, and solid -state video cameras. Credit- card -sii- ed cameras based on charge - coupled devices (CCDs) are uow available for less than $200. All of those components, together with the transceiver an transmitters described in 1 h article, make the mobile. tery-operated TV station a ity. You can package a co station in a c than 5 pounds operated in the field. In addition to two -way munications, the ATV presented in this article applied to radio -controlle model aircraft, boats, and cars. A transmitter and a small CCD camera placed in the vehicle act as "eyes" tor- the radio- con'lled model; the view from th lat- form can be seen on a TV receiver. You can also build wireless video cameras, surveillance devices, and carry out unobtrusive nature studies. All this is possible with a package that fits in the palm of your hand and operates from AA power cells. This is a two -part article; the 416 first part describes the opera- iusNG tion of the projects and the second part will cover the con- 3/4- tt, single -channel Mini verter, ant rel; and test struction of them. There are ATV tra smitter circuitry, " nontaIhed on a 3'>2- four related ATV projects: 3/4 -watt, single -channel ATV x 4 -inch PC board. An inte Complete ATV transceiver Jr. transmitter (it is the same as heatsink t -the with a 5 -watt, three -channel Mini ATV but without audio ca- power amp I ier a Id modulator transmitter, downconverter, pability) adds anot'/z -i ch, making line sampler, and RF switching The first project is a complete the overall stae 4 x x I inch. relay two -way amateur TV station. Because some readers might 5 -watt, three -channel trans- with a three -channel transmit- want to build only the transmit- mitter only ter, an integral receiving con- ter section, the PC board is de- 3i

www.americanradiohistory.com signed so that the receiving section (the downconverter), re- TABLE 1 -ATV APPLICATIONS lay, and line sampler (the test circuitry) can be omitted. That 5 -Watt Transceiver ATV base station will result in a three ATV portable and mobile operations -channel, 5- ATV video handie watt ATV transmitter measur- -talkies ing only 21/2 x 4 inches, includ- 5 -Watt Transmitter ATV ing the heatsink. base with separate down converters The transmitter can be made 3/4 -Watt Transmitter R/C video links even smaller if transmitter Surveillance applications power less than 5 watts is ac- Remote sensing ceptable. The low-power trans- Wireless cameras mitter, which measures 13/4 x 23/4 inches, generates a 0.5 to 1- VHF range, Channel 3 (60 to 66 ting. Typically, the transmitter watt output, and is powered MHz) or Channel 4 (66 to 72 produces 6 watts peak output from an 8- to 14 -volt source. Be- MHz) are the IF frequencies into a 50 -ohms load. cause it can be powered by a 9- most commonly used. A TV volt battery, this smaller version tuner usually can be modified to Circuitry is suitable for many applica- tune down to 420 MHz because Figure 1 is the ATV trans- tions in radio -controlled model all UHF TV tuners will tune as ceiver block diagram. Notice aircraft, boats, cars, and low as Channel 14 (470 MHz). that the transmitter section is robots. Its circuitry is similar to Some cable-ready sets can also enclosed in dashed lines. The the 5 -watt version except that it tune to certain UHF amateur crystal oscillator produces a sig- has no high -power RF amplifier frequencies. Channel 60 (canal of about 110 MHz. The exact and modulator. Table 1 lists sug- ble), at 439.25 MHz, is the most frequency depends on the crys- gested applications for the dif- commonly used amateur TV fre- tals installed. Any three crystals ferent ATV units. quency. A downconverter pro- whose frequencies are within A valid Rchnician Class ama- vides the simplest approach, 2.5 MHz of each other are suit- teur license (which does not re- however. It can also be the most able. They will allow a 20-MHz quire a knowledge of Morse effective, because the downcon- frequency spread between the code) is required to operate verter can be made continu- three output frequencies. A PIN - these transmitters legally in the ously tunable. diode network (Q1, D1, D2, D3) United States. Also, you should The projects to be described selects the appropriate crystal. know. that it is illegal to trans- include relatively low-priced RF A tuned network couples the mit on commercial frequencies transistors characterized for oscillator's second harmonic to with these units. If you do not 450 -MHz operation to deliver 1 doubler Q2, which produces a have a license, you can operate or 5 watts output. With a suit- 220 -MHz output. That is cou- these transmitters only into able antenna, a 30- to 40 -mile pled to a second doubler, Q3, nonradiating dummy loads for range can be obtained, depend- which again doubles the fre- test purposes. However, you can ing on factors such as height, quency to 440 MHz and pro- legally construct these units terrain, local noise and inter- duces 50 to 75 milliwatts of RF and you can listen to the trans- ference levels, and path charac- energy. A double-tuned network ceiver, but you will need a li- teristics. A small antenna, such couples this energy to Q8 which cense to transmit. Outside the as simple 6 -inch quarter-wave can produce nearly 1 watt of RF U.S., similar laws might apply- whip, will reduce the range. In energy. In the 3/4-watt transmit- check the regulations of the general, simple antennas give ter, Q8 is the final RF amplifier. country you are visiting. A no- unspectacular results. An effi- (It is labeled Q4 in that version.) code amateur license is suit- cient antenna at 450 MHz Amplifier Q8 drives Q9 to pro- able, and if you can construct doesn't have to be large; a good duce an output of about 6 watts these projects successfully, you Yagi antenna with over 10 dB during modulation peaks. Vid- should be able to pass the regain need only be a few feet long. eo modulator Q10 is in series quired exam for an amateur li- The transceiver includes a with the collector voltage supply cense easily. Call your local three -channel 5 -watt crystal - to Q8 and Q9. It modulates the amateur radio club, or a li- controlled transmitter that pro- Vcc supply to Q8 and Q9 with censed radio amateur for de- duces both picture and sound, a the video signal it receives from tails. You can also write to the low- noise, tunable downcon- amplifiers Q6 and Q7. A small American Radio Relay League verter covering the 420 to 440 sample of the RF output voltage (ARRL), Newington, CT 06111 MHz ATV frequencies, a sam- is rectified by D11 and fed to for details. (203) 666 -1541. pling circuit to monitor or test emitter -follower Q14. The out- ATV transmissions can be re- the transmitter output, and a put of Q14 is the modulation en- ceived on a standard TV receiver changeover relay to perform an- velope of the transmitted signal. with a simple downconverter tenna (RF) switching. The cir- The envelope can be observed that converts signals in the 420 cuit draws less than 50 milliam- with an oscilloscope, or it can to 450 MHz band down to a suit - peres when receiving and 800 to drive a monitor so that you can 32 able IF frequency. In the lower 900 milliamps when transmit- check picture quality.

www.americanradiohistory.com ANTENNA CRYSTAL RE OUTPUT 5W SWITCHING L P F. 09 50G 01 l \ RF AND O XTAL OSC. POWER MATCHING RE LAY D1 .02.D3 r AMP NETWORK 440MHz RY1 110MHz 440MHz r----, J r L10

011,014 UNE VIDEO O SAMPLER IN VIDEO 1Vpp 760 NOTE: SAMPLE TRANSMITTER SECTION OUT WITHIN DOTTED LINE

AUDIO 04 05 IN R33 AUDIO 4.5MHz AUDIO GAIN SOUND OSC. SUBCARRIERd` AMP SWITCH AUDIO SECTION IJ (OPTIONAL) J

CONVERTER IF OUT

I CH3 011.07.08 M1 O OR RF AMP MIXER CH4 TO TV RCVR RECEIVE _ TRANSMIT 420-440MHz

TRANSMIT YELLOW LED R50 CONVERTER POWER OFF TUNING RED LED ON POWER, 12-14VDC

section is enclosed in FIG. 1-AP/ TRANSCEIVER BLOCK DIAGRAM. The transmitter dashed lines. The transmitter output is fed to relay RY1 which is activated 440MHz 04 0.5 TO 1 W by the transmitter Vcc line. The 01 d 02 o DOUBLER o o RF PA OUTPUT OSC/DOUBLER ó ö r r relay is used solely for RF f f f (50f1) switching. In the receive mode. 110MHz 220MHz 440MHz is de- and RF +9 OR 9-12V MODULATED I the relay energized En XTAL +12V from antenna is fed to down - the D1 9 -12VDC converter RF amplifier 911. The PROTECTOR INPUT 05,06 07 noise figure of 1 VIDEO RF stage has a O MODULATOR less than 1 dB, a single -tuned VIDEO IN GAIN AMP input, and double -tuned out- 1Vpp 7551 put. Gain is about 20 to 23 dB. Signals from the RF amplifier LINEARITY +9T0+12V are fed to double -balanced mix- r I er M1 where they are mixed with AUDIO IN O the local oscillator (LO) signal oe -controlled os- 5mV TO AUDIO from Q13. Voltage 1 VOLT AMP cillator (VCO) Q13 has about a 15 range. -MHz tuning +6V REG. 1 SUB Varactor diode D9 is fed a bias CARRIER voltage from tuning potentiom- ON -OFF eter R50. During transmit, DC (OPTIONAL) voltage is removed from the RF SOUND SECTION stage. That reduces downcon- (USED WITH MINI AN ONLY) verter gain by about 50 dB. It L 5 -watt also allows the downconverter FIG. 2 BLOCK DIAGRAM OF THE 3/4 -WATT UNIT. It is almost identical to the to tune to the transmitted sig- version except that it has no 5 -watt stage or crystal-switching circuitry. nal, which is useful for monitoring. The IF output of mixer Ml above 100 MHz. IF amplifier Q12 standard TV receiver tuned to (60 to 72 MHz) feeds a lowpass has a 20 dB gain, and it pro- VHF Channel 3 or 4. filter that rejects UHF signals vides an IF signal to drive a If audio transmission is also 33

www.americanradiohistory.com Á Electronics Now, July 1994

Li- -i- 71/27 XTAL1 D1 Ri MPN3700 2.2K Cl CS C6 C10 C13 C15 SI 39pF 2.2pF 33pF 2 01 lpF L5" -10pF 1pF L7' F1 FREQUENCY 2N3563 C_... -K SELECT r C3 ; C9 F2 R2 L2' R8 L6` D2 18pF L3' 2-10pF C11 F3 2.2K 31/2T : 1052 oMPN3700 3UZT 2_10pF 03 XTAL2 MPS3666 R3 I 02 2.2K = C2 115 _ C7 MPS3866 L4' TP2 3300 56pF 01 6PF C16 D3 TP1 470pF R4 r XTAL3 MPN3700 C8 1K R7 T 22K 470pF C17

01.04, 100pF R6 RIO F19 10052 47052 10052 www.americanradiohistory.com 330 +12.6V S2' AUDIO = 040 R32 SOUND DISABLE INPUT (OPTIONAL) TO TP8 1µF 33K r - C41 RF POWER AMPLIFIER C20 -1- 1µF y L9' L11' L12' RF OUT (5052) 33pF 09 'Öfiit, .. r11ÖP-. TO ANTENNA C18 C21 -{ f R33 MRF652 C27 OR RELAY 100pF L8' 33pF 100K 6.8pF AUDIO C30 08 DRIVER GAIN 4.7pF R29 MRF559 C23 P.A. C26 68052 33pF L15' + L14' C22 2 -10pF C29 33pF - 10pF C39 0 F128 L10' 1426 1412 1µF 4.7K (413 C28 220K 7 C19 C24 °, C25 1000 1052 4.7pF 2-10pF 100pF 100pF ...... ,... 05 . ,_.s F127 C33 s C32 MPF102 )1 I( 10K .01T SOUND D5 OSC L MV2112 R14 J 1134 C38 3.3K W10D 0022 C37 O TP3 C36 C35 1325 3-4OpF 11 C42 11 689F R18 470K 11 120pF 2.2pF 1K )1 010 LINEARITY MJE200 F124 MODULATOR 1K

R23 R17 +12.6V VIDEO 33052 1K Q6 0 04 INPUT -,M-° 11V! W 2N4355 1N4007 R20 Q7 `SEE TEXT F122 1K 2N3669 VIDEO VIDEO C34 + 13.2V GAIN ..,s INPUT R19 AMP R16 R15 10µF 10K t00II 1552 desired, Q5 and D6 generate a PARTS LIST- 5-WATT frequency- modulated audio TRANSMITTER subcarrier at 4.5 MHz. The 4.5 MHz subcarrier is fed to video All resistors are Ye -watt, 5 %, unless 04-1 N4007 diode amplifier Q6 -Q7, and it modu- otherwise specified. D5- Motorola MV2112 varactor diode lates the transmitted carrier. An R1 -R3, R7 -2200 ohms D6 -1N757 diode switch R14-10 ohms, '/4 -watt Q1- 2N3563 transistor optional subcarrier R4, R17 -1000 ohms Q2, 03- Motorola MPS3866 transistor mutes the sound if desired. R5, R23 -330 ohms Q4- 2N3565 transistor This feature is also useful for R6, R9, R12, R16 -100 ohms 05- Motorola MPF102 FET test purposes. The FM subcar- R8, R13-10 ohms Q6-2N4355 transistor rier produces a "fuzz" on the R10 -470 ohms Q7-2N3569 transistor waveform from Q14 if R11 -33 ohms Q8-Motorola MRF559 transistor (alter- monitor nate MRF627) not turned off. The subcarrier R15-15 ohms R18, R20 -1000 ohms, potentiometer Q9- Motorola MRF652 transistor can also generate colored R19, R27- 10,000 ohms Q10- Motorola MJE200 transistor stripes on the video from Q14 R21 -not used Inductors (all coils wound on 8 -32 because of a beat with the 3.58 - R22-82 ohms mandrel unless noted-inductances MHz color subcarrier. This oc- R25-470,000 ohms below 50 nH are approximate and curs because some monitors do R26- 220,000 ohms may vary ±10nH) L1 -125 to 300 nH (71/2 turns No. 22 have a trap in their R28, R34-4700 ohms not sound R29-680 ohms enameled with Cambion Blue 8 -32 x''/4 video input circuits. R30, R32- 33,000 ohms slug) The 3/4-watt version has a sim- R31- 100,000 ohms L2, L3-50 to 100 nH (31/2 turns No. 22 ilar RF chain (see Fig. 2). Os- R33- 100,000 potentiometer enameled with Cambion Blue 8 -32 x'Y cillator Q1 and doublers Q2 and R34 (alternate value)-2200 or 3300 slug) Q3 are almost identical to those ohms L4-30 nH (4 turns No. 22 tinned) L5-39 nH (5 turns No. 22 tinned) in the 5 -watt version. Tran- Capacitors C1 -39 pF, NPO L6, L8-5 nH ('h turn No. 22 tinned) a am- sistor Q4 serves as power C2, C7 -56 pF, NPO L7 -10 nH (11/2 turns No. 22 tinned) plifier while Q5, Q6, and Q7 C3-18 pF, NPO L9-7 nH (1/2 turn No. 20 tinned, 0.375" make up the video amplifiers C4, C33 -0.01 µF, disc GMV dia.) No. 22 tinned) and modulator, respectively. C5, C42 -2.2 pF, NPO (C42 alternates 1 L10-40 nH (5 turns The main difference is in its or 3.3 pF) L11 -20 nH (2 turns No. 20 tinned) L12-12 nH (1 turn No. 29 tinned) lack of the 5 -watt stage and C6-33 pF, NPO C8, C16-470 pF, 20% disc L13-11 µH (12 turns No. 22 enameled crystal- switching circuitry. C9, C11, C13, C14, C19, C26-2 -10 pF, on 0.375" toroid core) A detailed circuit description trimmer (yellow body) L14 -Bead choke, 43 matt of the 5 watt transceiver follows. C10, C15-1 pF, NPO L15-part of R13 Remember that the 5 -watt C12 -2 -18 pF, trimmer (green body) Other components transmitter is the transceiver C17, C18, C24, C25, C31 -100 pF, chip XTAL1- 54.90625 MHz crystal the downconverter, line 60 x 120 XTAL2- 54.25000 Mhz crystal without C20-C23-33 pF, chip 60 x 120 XTAL3- 53.28125 MHz crystal relay. Also, sampler, and the RF C27 -6.8 pF, NPO Sl-SP3T switch and hardware much of the circuitry in the `- C28, C30-4.7 pF, NPO S2 -SPST toggle switch watt version is identical to the C29-10 pF, NPO circuitry in the 5 -watt unit, so C32 -10 µF, 16 volts, electrolytic Miscellaneous: 2 RCA jacks, 1 female only the 5 -watt unit will be dis- C34-10 µF, 16 volts, tantalum chip BNC, 1 power connector, 1 LED, 1 1000- cussed here. C35-68 pF, NPO or SM ohm 1/4-watt resistor, No. 22 enameled C36-120 pF, NPO or SM wire, No. 20 tinned wire, No. 22 tinned C37 -3-40 pF, trimmer (gray body) wire, No. 32 enamelled wire, heatsink ATV transmitter C38-0.0022 µF, 50 volts, Mylar material, 1 TO220 mica insulator, 5 No. Figure 3 is the schematic for C39-C41 -1 µF, 35 or 50 volts, alumi- 2x'/4" BHMS, 5 No. 2 nuts, 6 No. 4 the 5 -watt transmitter. Fig. 4 is num electrolytic locks, 1 No. 4 x'/2" BHMS, 1 No. 4 nut, 1 1 x the schematic for the Mini ATV, Semiconductors No. 8 nut, 1 No. 8 lock, No. 8 1" BHMS (for use as coil form), transmitter Fig. 5 is the schematic for D1 -03- Motorola MPN 3404 PIN diode and (alternate MPN 3700) PC board, power -amp PC board the ATV Jr. Transistor Q1, a 2N3563, forms part of the crystal oscillator. Depending on through a PIN diode. In the 3/4- and C1 provide a high imped- which of three crystals is se- watt version. R1 and R2 bias ance load for the collector of Q1: lected by Si, a + 12 -volt bias is Qt's base to about + 3 volts, and L1 and Cl should be resonant at applied to R1, R2, or R3, which XTAL1 is connected between its a frequency slightly higher than forward biases PIN diode D1, base and ground. the crystal frequency (around D2, or D3. The bias causes the At its series -resonant fre- 55 MHz or so). Because 55 -MHz PIN diode to appear as a resis- quency, XTAL1 appears as a low crystals are used, the oscillator tance of a few ohms or less. Re- impedance, effectively ground- frequency must be multiplied sistor R4 completes the path to ing the base of Q1. This forms a by 8 to obtain 440 MHz. While ground and forms the bottom common -base oscillator at the three doubler stages or a dou- leg of a voltage divider, supply- crystal's series -resonant fre- bler and a quadrupler stage ing about +3 volts bias to Qt's quency. Frequency- selector could do that. quadruplers are base. The corresponding crystal switch Si applies 12 volts to the not usually efficient. is connected to the base of Q1 selected crystal. Components L1 To minimize the number of 35

www.americanradiohistory.com L1' C3 C6 000, DOUBLER C10 DOUBLER C15 2.2pF 33pF RE AMP C19 L5' 1pF LT L9' 10pF K RF OSC/ DOUBLER C2 OUT 01 39pF 440MHz í1 C13 314 C14 C18 2313583 03 iC 2 -10pF 2-10pF 04 1pF C4 MPS3866 MRF559 18pF L6'

C7 R1 { s R2 R5 `C1 56pF 2.2K TP2 TP3 33Kt 51110 R10 O 58pF o XTALt R3 R8 5100(3 330[3 C16 R9 T 54.90826MHz I 470(3 R4 1009F 3313 100(1vtl s 'SEE TEXT AUDIO SWITCH ó; (OPTIONAL) 0- R21 +6.8V 880(3 MODULATOR 9-14V cra D3 R11 OC 1Nr64 09 10µF 33011 06 33(1 07 C20 SUPPLY MPF102 2113935 MJE180 RI9 10µF 100 mr = D7 MV2/1202 4 C24 4.5MHz C22 013 1314007 R23 2-18pF VCO v 88pF 3.3K 1001(

C23 L10' 024 C30 10K .0022 TOROID 022 05 C21 2 2pF 1K 2313904 R25 120pF 4.7K C25 .. 047pF S 08 C28 C28 7S R28 243666 . R15 01 0 071I 33K 33K AUDIO AMP 1M R27 R78 R74 100K LINEARITY 1K 1K (VIDEO R28 GAIN) 33K ?.Ç27 AUDIO INPUT 0.47µf 005-1Vp-p # RIO VIDEO 330G ////,,,,,,,, 4 INPUT ¡ R29 1 Vpp 750 100K tR17 AUDIO 82ü GAIN

FIG. 4 -MINI ATV. This 3/4 -watt unit, complete with audio capability is useful where size is a factor.

stages, the oscillator is made to harmonics. The collector of Q2 sions. It is the test point for act as its own doubler. This is is connected to oscillation -sup- measuring the DC done by current in placing a resonant cir- presser resistor R8 and to reso- the collector circuit of Q2. As cuit-L2 and C3-in series with nant-circuit C9-L4 -C8 tuned to more RF drive is applied to the the collector circuit, tuned to 220 MHz. Components C13 and base of Q2, more current is twice the crystal frequgncy. Ca- L6 select the 220 -MHz compo- drawn by Q2. By monitoring the pacitor C4 acts as a ca- bypass nent of the signal and couple it DC voltage drop across 100 - pacitor. In trie 3/4-watt Mini ATV via C10 to another tuned cir- ohms resistor R9 (R7 in the 3/4- versions, the corresponding cuit, C11- L5 -C12, also tuned to watt versions), it is possible to parts C4, L2, and C5 perform 220 MHz. tune L1, L2, and L3 properly the same function. This circuit Notice that test point TP1 is without detuning them. Adjust has a high impedance at 110 located at the "cold" side of L4 in L1 to produce a MHz, voltage drop and it also appears as a both the 5- and 3/4 -watt ver- across R9, and then adjust L2 very low impedance at 55 MHz. and L3 to maximize the drop, Similarly, L1 -C1 appears as a which can be as much as 4 to 5 high impedance at 55 MHz but a volts DC. Base resistor R10 sup- very low impedance at 110 MHz. plies 220 -MHz bias to Q3 after Capacitor C5 couples 110 MHz RF rectification. energy to resonant circuit L3- 'f-ansistor Q3 is driven hard, C6-C7, which is tuned to 110 causing it to act as a highly non- MHz. With this double -tuned linear amplifier. This stage circuit, a fairly clean 110 -MHz draws 30 to 50 milliamperes of signal is produced. current. Tined circuit C11 -L5- The RF voltage at the junction C12 at the base of Q3 couples of C6, C7, and bias resistor R7 220-MHz 5-WATT ATV TRANSCEIVER. This small energy to Q3. Capaci- drives the base of Q2 (an tor C10 couples the collector MPS3866) package contains all the circuitry you'll cir- fairly hard at 110 need for transmitting, receiving, and cuit of Q2 to the base of Q3. This MHz. This results in a signal at downconverting a video signal com- provides a double -tuned circuit 36 the collector of Q2 that is rich in plete with sound. at 220 MHz, yielding good rejec-

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3d9 L 40 £99£NZ ddb£ LO INV ZO 01 .61 .S1 ACC ddZ Z ino ddOL .L1 dd ddL dH 90 50 61.0 dWV H3MOd SLO H319n00 OLO H3113n00 H319n00/OSO uos .L1 tion of unwanted frequencies. PARTS LIST -5 -WATT Adjust trimmer C12 for op- TRANSCEIVER timum matching to the base of All resistors are '/8 -watt, 5 %, un- below 50 nH are approximate and Q3. less specified may vary ± 10nH) Capacitors C16 and C17 form R1 -R3, R7, R49 -2200 ohms L1 -125 to 300 nH (71/2 turns No. 22 a resonant circuit tuned to 440 R14-10 ohms, 1/4-watt enameled with Cambion Blue 8 -32 x Y4 MHz. Inductor L6 is a half R4, R17, R53, R55-1000 ohms -turn slug) loop of No. 20 wire (about 0.006 R5, R23, R45, R47, R56 -330 ohms L2, L3-50 to 100 nH (31/2 turns No. 22 R6, R9, microhenry). C17 R12, R16, R35, R36 -100 ohms enameled with Cambion Blue 8 -32 x Y4 Capacitor has R8, R13-10 ohms slug) a low impedance at 440 MHz, R10, R41 -470 ohms L4-30 nH (4 turns No. 22 tinned) and C15 couples the 440 -MHz R11 -33 ohms L5-39 nH (5 turns No. 22 tinned) energy to tuned circuits C14 R15, R44-15 ohms L6, L8-5 nH (Y2 turn No. 22 tinned) and L7. At this point, about 50 R18, R20 -1000 ohms, horizontal - L7 -10 nH (11 turns No. 22 tinned) to 75 milliwatts of RF energy at mount potentiometer L9-7 nH (1/2 turn No. 20 tinned, 0.375" R19, R27, R46- 10,000 ohms dia.) the transmit frequency (426 to R21 -not used L10-40 nH (5 turns No. 22 tinned) 440 MHz) is available. The same R22-82 ohms L11 -20 nH (2 turns No. 20 tinned) RF exciter circuitry (Q1- Q2 -Q3) R25, R39-470,000 ohms L12--12 nH (1 turn No. 29 tinned) is in both the 5- and '1/4-watt R26- 220,000 ohms L13-11 µH (12 turns No. 22 enameled transmitters. Test point TP2 R28, R34, R42 -4700 ohms (7 x gain on 0.375" toroid core) permits R34 = 3300 ohms, 5X gain R34 = 2200 L14-Bead choke, 43 matt monitoring collector ohms) L15 -part of R13 current of Q3 for tuning C9. R30, R32- 33,000 ohms L16-7 nH (1 turn No. 20 tinned) C13, and C12. It is adjusted by R31, R38, R51- 100,000 ohms L17, L18-20 nH (2 turns No. 20 tinned) peaking the three trimmer ca- R33- 100,000 ohms, horizontal -mount L19-75 nH (5 turns No. 22 enameled) pacitors for a maximum current potentiometer L20 -200 to 550 nH (111 turns No. 22 drain in Q3's collector. In the 5- R29, R43-680 ohms enameled with Cambion Blue, 8 -32 x 1/4 R37 -47 ohms watt version, Q8 and Q9 form a slug) power amplifier. R40-220 ohms L21-8 nH (Y2 turn No. 20 square loop) Resistor R12 R48-6800 ohms L22 -18 µH RF choke provides self-bias for Q8, which R50-1000 ohms, thumbwheel potenti- Semiconductors receives base drive from tuned ometer D1-D3--Motorola MPN 3404 PIN diode circuit C12 -L7. R52-470 ohms, 1/4-watt (alternate MPN 3700) The collector of Q8 R54-3300 ohms (4700 ohms for nor- circuit D4- 1N4007 diode consists of RF choke L14. by- mal use) D5- Motorola MV2112 varactor diode Capacitors D6, D10-1N757 diode pass capacitor C31, and match- Cl, C53-39 pF, NPO D7, D8, D11 -8200-2835 diode ing network C19 and L8. All C2, C7-56 pF, NPO D9- Motorola MV2103 varactor diode bypass capacitors are ceramic C3, C52 -18 pF, NPO 01, Q12- 2N3563 transistor chips. They are the only bypass C4, C33, C53 -055, C62, C67, C69, Q2, Q3- Motorola MPS3866 transistor capacitors that are C70-0.01 µF disc GMV both small 04-2N3565 transistor and effective at 440 MHz. C5, C42-2.2 pF, NPO (alternate C42- Q5-Motorola MPF102 FET The 1 or 3.3 pF) 06-2N4355 transistor collector of Q9 feeds matching C6, C56-33 pF, NPO 07- 2N3569 transistor network L9, C26, C27, C28, C8, C16-470 pF, 20% disc Q8- Motorola MRF559 tran- LI1, C29, L12, and C30. which C9, C11, C13, C14, C19, C26, C43, C46, sistor(alternate MRF627) also acts as a Iowpass filter. Har- C57, C59 -2 -10 pF trimmer (yellow 09- Motorola MRF652 transistor monic output is a low 45 to 50 body) Q10- Motorola MJE200 transistor dB. 010, C15, C60, C64-1 pF, NPO 011 -NEC 25137 or NEC 25139 FET C12-2 -18 pF trimmer (green body) Q13- Motorola MPSH81 transistor 'fransistors Q8 and Q9, which C17, C18, C24, C25, C44, C45, Q14- 2N3904 transistor form the power amplifier as- C47 -C49 -100 pF, chip Other components sembly, are mounted on a sepa- C20-C23-33 pF,60 x 120 chip XTAL1- 54.90625 MHz rate heatsinked subassembly. C27 -6.8 pF, NPO XTAL2- 54.25000 Mhz Video -modulated DC is fed to C28, C30 -4.7 pF, NPO XTAL3- 53.28125 MHz C29, 065-10 pF, NPO S1 -2P3T switch C32, C63, C66-10 µF, 16 volts, elec- S2 -SPST toggle switch trolytic RY1 -12 -volt DIP relay 034-10 µF, 16 volts, tantalum chip M1 -SBL -1 mixer 035-68 pF, NPO or SM

036 -120 pF, NPO or SM Miscellaneous: 2 RCA jacks, 1 female 037 -3 -40 pF, trimmer (gray body) BNC, 1 power connector, 1 LED, 1 1000 - 038-0.0022 µF, 50 volts, mylar ohm 1/4-watt resistor, No. 22 enameled C39, C40, C41 -1 µF, 35 or 50 volts, wire, No. 20 tinned wire, No. 22 tinned electrolytic wire, No. 32 enameled wire, heatsink C50-0.6 pF (part of PC board) material, 1 T0220 mica insulator, 5 No. C57 -6.8 pF, NPO 2 x 1/4" BHMS, 5 No. 2 nuts, 1 12" teflon C58 -5.6 pF, NPO cable, 1 2" potentiometer shaft, 6 No. 4

C61 -100 pF, NPO locks, 1 No. 4 x Y2" BHMS, 1 No. 4 nut, 1 068-470 µF, 16 volts, electrolytic No. 8 nut, 1 No. 8 lock, 1 8 x 1" BHMS 5-WATT TRANSMITTER (bottom) has au- Inductors (all coils wound on 8 -32 (for use as coil form), transceiver PC dio output but it can't receive or down - mandrel unless noted -inductances Board, power -amp PC board convert video. Mini ATV (top) is a 3/4 -watt 38 unit that can transmit audio and video.

www.americanradiohistory.com TP5 ANTENNA R39 R40 420- 450MHz +12V RELAY 470K 22052 TP4 +12V RF AMP DOWNCONVERTER ONLY) R38 C49 (RCV 100K 1009F C55 C47 ,l C48 .01 100pF 100pF R43 011 6800 NEC25137 K C54 RF AMP C51 .01 2-1opF L16" _ L17* r Noy` IF N.C. R37 TO/FROM 0 OUT S 4752 ANTENNA N.O. TO TV 1 C50 L2 C58 RCVR 1 0.6pF R42 C45 33pF CH3 R36 4.7K FROM 1000 I( POWER AMP C46 2-10pF 0- C57 . 689F I L18' I RY1 R35 C64 MIXER C53 10052 1pF L19* 39pF 40000\-0-I1 61.25MHz M1 4 R52 C70 C65 L22 R41 SBL-1 47052 ?" T/R .01 10pF 18µf C52 4700 CONTROL T 18pF N 5I 6 7I TP8 VN D11 R55 R45 D10 = R44 LOCAL 2835 1K R54 33052 150 1N757A + 3.3K OSCILLATOR

C61 C59 L21" - C66 014 100pF 2-10pF R53 2N3904 R51 10µF 1K C67 C63 SAMPLER -K 11 100K T.01 LINE / D9 10µF MV2103 013 R46 K y C69 MPSH81 10K R50 +12V 1 C60 SSS 1K TP6 LINE 1 1pF TUNING SAMPLER R56 r«1 R48 I (XMIT ONLY) C58 33052 6.8K 1-% 5.6pF C62 C68 IF R49 R47 .01 470µF 2.2K 3300 a LINE TP7 SAMPLER O )I+ OUTPUT (" SEE PARTS LIST)

FIG. 6- DOWNCONVERTER, antenna relay, and line sampler. The downconverter consists of a tuned RF stage with a low- noise, dual -gate GASFET, a double -balanced diode mixer, an IF amplifier, and a varactor-tuned local oscillator.

PARTS LIST-ATV JR. Inductors (all coils wound on All resistors are '/e -watt unless other- C4-18 pF, NPO x 1/4" form unless noted- induc- wise specified C5 -0.01 µF, disc GMV 8-32 tances below 50 nH are approximate R1- 33,000 ohms C6-33 pF, NPO and may vary ± 10 nH) R2, R19- 10,000 ohms C8-470 pF, disc GMV L1 -125 to 300 nH (71/2 turns No. 22 R3, R12, R16 -330 ohms C9, C11, C13, C14 2 -10 pF trimmer enameled with 8 -32 x'h" Cambion Blue R4, R7, -R10-100 ohms (yellow body) slug) R5 -2200 ohms C10, C15, C18-1 pF, NPO L2, L3-50 to 100 nH (31/2 turnsNo. 22 R6-10 ohms C12-2 -18 pF trimmer (green body) with 8 -32 x'/." Cambion Blue R8-470 ohms C16, C17 -100 pF, chip enameled slug) R9, R11 -33 ohms C19-10 pF, NPO L4-30 nH (4 turns No. 22 tinned) R13 -3300 ohms C20-10 µF, 16 volts, chip L5, L8-39 nH (5 turns No. 22 tinned) R14, R18 -1000 ohms, horizontal - Semiconductors nH ('/2 turn No. 22 tinned 0.375" mount potentiometer D1- 1N4007 diode L6-5 dia.) R15 -3300 ohms (alternate 2200 to D2- Motorola MV2112 varactor diode nH (21/2 turns No. 22 tinned) 4700 ohms) Q1-2N3563 transistor L9-25 R17-82 ohms Q2, 03- Motorola MPS3866 transistor Other components XTAL1- 54.90625 MHz crystal Capacitors 04- Motorola MRF559 transistor Miscellaneous: AN Jr. PC board, 8 -32 Cl, C7 -56 pF, NPO 05- 2N3904 transistor screw for coil winding C2 -39 pF, NPO Q6- 2N3906 transistor C3-2.2 pF, NPO 07- Motorola MJE180 transistor 39

www.americanradiohistory.com PARTS LIS T-MINI ATV A 440 -MHz signal is fed through L7 to the base of Q8. All resistors are '/e -watt unless other- C23- 0.0022 µF, 50 volts, mylar About 0.5 to 1 watt of RF is pro- wise specified C25-C27 -0.47 or 1.0 µF 35 volts, tan- R1, R26, R28- 33,000 ohms talum electrolytic duced by Q4, depending on the R2, R19, R24- 10,000 ohms C29-10 µF, 16 volts, electrolytic supply voltage. A matching net- R3, R12, R16-330 ohms C30-1 to 3.3 pF, NPO (1 pF, and 2.2 pF work is formed by L9, C18, and R4, R7, -R10-100 ohms supplied in Mini -AN kits -value deter- C19. The network is broadband, R5 -2200 ohms mines sound subcarrier level) and fixed tuning was found to R6-10 ohms Inductors (all coils wound on be adequate. Notice that in the R8-470 ohms 8-32 x 1/4" form unless noted- induc- 3/4 R9, R11 -33 ohms tances below 50 nH are approximate -watt version, the Vcc supply R13 -3300 ohms and may vary ±10 nH) fed to Q4 is the only modulating R14, R18 -1000 ohms, thumbwheel L1 -125 to 300 nH (7' turns No. 22 source. trimmer potentiometer enameled with 8 -32 x'1" Cambion Blue The video modulating circuit R15 -3300 ohms (alternate 2200 to slug) in both transmitter circuits is 4700 ohms) L2, L3-50 to 100 nH (31/2 turnsNo. 22 identical except for component R17-82 ohms enameled with 8 -32 x'/d' Cambion Blue R20 -not used slug) values. Transistor Q10 is part of R21 -680 ohms L4-30 nH (4 turns No. 22 tinned) a feedback -pair video amplifier R22 -1000 ohms L5, L8-39 nH (5 turns No. 22 tinned) with Q7 acting as a video ampli- R23, R27- 100,000 ohms L6-5 nli ('/z turn No. 22 tinned 0.375" fier. 11-ansistor Q6 supplies con- R25 -4700 ohms dia.) stant current to the base of Q10, R29- 100,000 thumbwheel trimmer po- L9-25 nH (21/2 turns No. 22 tinned) assuring drive at peak voltages. tentiometer L10-11 µH (12 turns No. 22 enameled Capacitors on toroid) This current produces a larger voltage C1, C7 -56 pF, NPO Semiconductors swing than if a resistor C2-39 pF, NPO D1- 1N4007 diode were used in the collector of Q6. C3-2.2 pF, NPO D2- Motorola MV2112 varactor diode The quiescent point (zero sig- C4-18 pF, NPO D3 -1N754 diode nal voltage) is set by the ratio of C5, C28-0.011.1.F, Disc GMV Q1-2N3563 transistor feedback -resistor R34 to lin- C6-33 pF, NPO Q2, Q3- Motorola MPS3866 transistor C8-470 pF, Disc GMV earity- control resistance R18, as 04- Motorola MRF559 transistor well as gain C9, C11, C13, C14 -2 -10 pF trimmer Q5-2N3904 transistor -control potentiome- (yellow body) Q6-2N3906 transistor ter R20. Adjust R20 for max- C10, C15, C18-1 pF, NPO Q7- Motorola MJE180 transistor imum gain without white or C12, C24 -2-18 pF trimmer (green Q8-2N3565 transistor black clipping, and adjust R18 body) Q9-Motorola MPF102 FET to set the operating point. C16, C17 -100 pF, chip Input C19-10 pF, NPO Other components video should be between 0.7 to C20-10 µF, 16 volts, chip XTAL1- 54.90625 MHz crystal 1.5 volts p -p, negative sync. C21 -120 pF, NPO or SM Miscellaneous: Mini ATV PC board, C22 -68 pF, NPO 8 -32 screw for coil winding form Audio The audio channel (not used in the ATV Jr.) is basically the Note: The following 3/4-Watt items are avail- ATV Jr. kit (contains PC same in all versions. It consists able from North Country Radio, PO board and all parts that mount on it Box 53, Wykagyl Station, New and crystal for 439.25 MHz opera- of a preamplifier stage built Rochelle, NY 10804 -0053: tion)- $59.00 around a 2N3565 (Q4) with a 5-watt transceiver kit (contains PC Test Crystals (CH14, 15, 16, 17, 18, voltage gain of about +43 dB. boards, all parts that mount on them, for test or export only -not legal for In both 5 -watt boards, audio is chassis connectors suitable for on the air transmission in the USA) fed to gain -control R33 through basic operation, and three crystals and others for 434.0 -, 427.75 -, coupling capacitor C41 to for 439.25, 434.0, and 426.25 MHz)- - 426.25 -, and 421.25 -MHz are avail- the $179.00 able-$8.50 each, specify channel base of Q4. Audio developed 5-watt transmitter kit (contains PC Other ATV kits for 440- and 915 - across R28 is coupled by C39 boards, all parts that mount on them, MHz and CCD cameras are avail- and R27 to varactor diode D5. suitable chassis connectors for able-contact North Country Radio The oscillator frequency is de- basic operation, and three crystals for details termined by L13 and the capaci- for 439.25, 434.0, and 426.25 MHz- A complete catalog of kits is avail- tance that shunts it. This is the downconverter and line sampler able from North Country Radio - components and RF switching relay send $1.00 with a self addressed series equivalent of C36 and NOT included)- $149.00 stamped (52 cents) envelope C35, the input capacitance of 3/4-Watt Mini -ATV kit (contains PC Please include $4.50 for the first item Q5, trimmer C37, and the board and all parts that mount on it and add $1.00 for each additional varactor diode capacitance. with crystal for 439.25 MHz opera- item for postage and handling. New Adjust the oscillator by set- tion)- $79.00 York residents add sales tax. ting C37 for operation at 4.5 MHz. When an audio signal is LlO and through R14 to L14. Ca- 12 volts p -p into a 12 -ohm load. applied to the junction of C38, pacitors C24, C25, and C31 This requires a power amplifier R25, R26 and D5, the effective have low impedance at 440 MHz with a response from DC to 4 capacitance of D5 varies with but high impedance at the high- MHz. Modulator Q10 is installed the instantaneous voltage er video frequencies. The modu- on the same heatsink as Q8 and across it. This response causes 40 lator must deliver video at 10 to Q9. Continued on page 84

www.americanradiohistory.com THE 'LED-HEA Build this amusing Electronic Face that appears to change mood when the LEDs that define its features are randomly switched. ROGER SONNTAG

puts of each oscillator can be set manually by adjusting trimmer potentiometers on the circuit

How does it work? Random triggering of the array array of 36 LEDs arranged represent a line drawing of the to outline eyebows, eyes and eyebrows, eyes, and mouth of a mouth by Schmitt -trigger inver- human face. ter oscillators can cause the face The LEDs on the circuit to smile, frown, move its eyes board are illuminated for vary- from side to side, and arch its ing lengths of time by oscillators eyebrows. set to change waveforms at dif- Figure 1 is an elementary ferent time intervals. These schematic for each Schmitt variations impart a random- trigger inverter circuit that is - HUMANS RESPOND TO CHANGES IN ness to the changes in facial ex- organized as an astable multi the expressions on other pression. You'll find that this vibrator to produce a variable human faces that reflect emo- dynamic electronic display at- square -wave output. A resis- tional state -happiness, anger, tracts a lot of attention -even tance- capacitance network con- depression, boredom, and so from people who normally sisting of a 1- megohm trimmer on. Psychological studies have wouldn't pay much attention to potentiometer in a feedback shown that people respond to electronic circuits. loop around the oscillator and a those changes regardless of Wear it around your neck on a 47- microfarad capacitor from their gender, cultural back- cord, place it on your desk, or input to ground permit man- ground, race, or age difference. hang it up as decoration, and ually changing the RC time con- Most people draw inferences watch other people respond to stant. This, in turn, changes (rightly or wrongly) about the its many changing faces. They'll the duty cycle of the output mood of others by noticing rela- be curious about it and want to square wave. The trimmer is tively minor changes in facial know how and why the expres- normally set at about its 500 - features -the tilt of the eye- sions change. kilohm mid -range position brows, the cast of the eyes, and If you build the Electronic Manually changing the trim- the turn of the lips. The Elec- Face you'll learn about astable mer's wiper position can change tronic Face reproduces these multivibrators based on the frequency of the oscillator's effects symbolically with an ar- Schmitt trigger inverters. The square -wave output from 5 ray of 36 LEDs positioned to periods of the square -wave out- pulses per second down to once 41

www.americanradiohistory.com every +V 50 seconds. Each circuit MC14584B or the Harris can source or sink current to CD40106B. All of these parts R1 turn on the LEDs. have the same pinout diagram, Figure 2 is a schematic for the and pins 3 and 4 are unused. Electronic Face. Five of the six gates of ICI, a 74HCT14A CMOS Making the Face hex Schmitt trigger inverter An octagonal circuit board is t*IC1.-a drive the LEDs by sinking or recommended for the con- SCHMITT TRIGGER sourcing them. The shading instruction of this project. A foil INVERTER dicates the positions of the 36 pattern for this circuit board is LEDs that define the eyebrows, included in this article, but a eyes, and mouth of the circuit. finished, trimmed and drilled The features will change at dif- board can be obtained from the ferent rates when set by adjust- source given in the Parts List as FIG.1 -BASIC CIRCUIT of the Electronic ing trimmer potentiometers part of a kit. Face is a Schmitt trigger inverter with a R16 to R20. Before inserting and solder- feedback resistor and a capacitor to ground. The circuit sources or sinks Motorola offers an ing any components, decide LEDs. MC74HCT14A hex Schmitt trig- how you want to mount the cir- ger inverter IC, but any of the cuit board and whether you following can be PARTS LIST substituted: want to power it from four Motorola MC74HC 14A, power cells or a wall outlet- All resistors are 1/4 -watt, 10 %. R1, R2, R5, R7, R14, R15 -330 ohms R2, R3, R6, R8, R12 -220 ohms R17 R9, R10, R11, R13 -680 ohms 1MEG R16, R17, R18, R19, R20 -1 12 13- megohm trimmer potentiometer + ICI -a ICI-b three -pin, PC mount, single -turn ro- ¡ 'ia74HC14 R1 R4 ae74HC14 í= C 33011 33053 C2 tary unit. 47µF 47µF Capacitors Cl, C2, C3, C4, C5, -47 .tF, 10 volts, radial -leaded, aluminum electrolytic Semiconductors at 1.%Pt AI IC1- MC74HCT14 hex Schmitt trig- W W W W W W W W ger inverter, plastic DIP or equiv- " + lent (see text). n 410% W V/" W" W LED1- LED36- light- emitting di- 3300 R6 R8 330f2 ode, red, radial -leaded, T1 pack- 220G 22053 age (see text) Miscellaneous: circuit board, red translucent plastic filter (see text); battery holder (see text); mounting board or case (see text), AC to DC adapter and coaxial jack (optional -see text); solder; fasten- ing hardware Note: The following options are offered by General Science and Engineering, P.O. Box 447, Rochester, NY 14603, IC1c ICI-d 716- 338 -7001. ae74HC14 ..e 74HC14 Completely C3 C4 assembled and 47µF 47µF mounted circuit with filter, wall - outlet adapter, and matching jack-$59.00 Kit of parts including circuit board, all components, and filter, less case, and battery holder- $24.00 LEDS 1 TO 36 Wall outlet AC- to DC- adapter. -$5.00 Money orders, Visa, or Master Card accepted. Add $3.00 S &H. New York State residents add FIG. 2- SCHEMATIC FOR THE ELECTRONIC FACE. The shading defines the LEDs for local tax. each moving feature. Five of the six Schmitt trigger inverters in a hex IC illuminate the 42 face LEDs to show mood changes.

www.americanradiohistory.com AC to DC adapter. Drill BATTER" OR mounted AC/DC ADAPTER JACK the clear mounting holes at the +Il of board if you edges the circuit CLEAR CLEAR make your own. HOLE HOLE Refer to Fig. 2 and component side parts placement diagram Fig. 3. Form and insert resistors LR16J LR20 , 1217 Cl C2 R1 to R13 on the component side of the PC board and solder R2 R5 a pencil all leads with soldering R5- -R7- with a fine tip set at a heat level - satisfactory for melting rosin - -05 - core solder. 11-im the leads close R1 -R8 to the board -R6- R4` - Form and insert the leads of electrolytic capacitors Cl to C5 in the board, observing their R9 R13 CI3 CI4 / correct polarities. Solder the \ R11 + + leads and trim them close to the rR18 {Thin board. Insert trimmer potenti- I- - R14- -R15 - ometers resistors R16 to R20, solder them in position and trim excess leads. -R12 The LEDs to be soldered on - the solder side of the board are specified as red, radial -leaded units in Tl cases. They might or COMPONENT SIDE might not have flat surfaces at FIG. 3- COMPONENT SIDE PARTS PLACEM ENT DIAGRAM for the Electronic Face. their bases. However, even without the flats, the cathode lead is HOLE HOLE typically the shorter of the two. (The LED die is mounted on the cathode lead.) It is recommended that all LEDs be tested to see that they are functional with a suitable battery before they are inserted in the board. Reverse the circuit board and óaoo GC] óoaaó this time refer to Fig. 2 and solder -side parts placement diagram Fig. 4. Insert the LEDs in lc, DáSo the circuit board in clusters of a88° six to eight, observing their correct polarities. Adjust the height of the LED bases about N inch above the board. Avoid bending the leads of the LEDs when inserting them. Solder DoODCIOD those LEDs and trim their leads close to the board. Continue inserting and positioning the LEDs in small clus- SOLDER SI DE ters until all 36 have been soldered and trimmed. Then re- 9 SURFACE check their polarities to be sure FLAT FLAT that placement was correct. (CATHODE) O (CATHODE) Note: the LEDs can be inserted SHORTER SYMBOL from the component side and LEAD soldered on the foil side without changing the operation of the LED INSERTION circuit, if you prefer. FIG. 4- SOLDER SIDE PARTS PLACEMENT DIAGRAM for the Electronic Face. Insert and solder IC1 on the solder (foil) side of the circuit bridges or cold solder joints Circuit operation board. Then recheck the com- (dull gray). Make any repairs Adjust each of the trimmer plete board looking for solder needed. potentiometers R14 to R17 with 43

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www.americanradiohistory.com RED PLASTIC Feature Time (seconds) FILTER Eyes 2 to 3 Eyebrows 4 to 10 Mouth 8 to 15 Packaging the circuit Refer to the mechanical assembly diagram Fig. 5 for one possible packaging configuration. There are, however, many other possibilities. For the most TO BATTERY effective display, it is recom- PACK OR AC/DC ADAPTER JACK mended that the LEDs be covered with a red filter made from red -dyed transparent sheet plastic. The red filter screens out obvious variations in the brightness level of individual LEDs and masks the circuit components and circuit board traces that would otherwise be visible on the board. If you want to power the face with batteries, obtain a battery holder for four AA cells (Radio Shack No. 270 -383 or equivalent). Determine the lengths of the wires from the holder wires that you will need after you have decided how you want to mount the circuit. FOUR-CELL Strip the ends of the insu- BATTERY HOLDER lated hookup wire from the holder, and solder the red wire FOUR AA CELLS WOOD OR in the hole marked + on the MASONITE circuit board and the black (ground) FIG. wire in the hole 5-MECHANICAL ASSEMBLY. The mounting board can be wood or even a suit- marked - . The four AA cells will able plastic case. The three parts are assembled with screws, nuts, pins and spacers. provide a DC voltage of about 5 volts for battery- powered circuit operation. Alternatively, Electronic Face can be powered from a 120 -volt AC to 6 -volt DC wall -outlet adapter. This should be a UL Listed Class 2 transformer with a rating of 120 volts AC, 5 watts and an output of 6 volts DC at 150 to 200 milliamperes. The circuit board can be mounted on a square '/8 -inch plywood or Masonite of appropriate size to permit the circuit board to be sandwiched between the filter and substrate. Allow enough room for nuts, bolts and spacers near the edges if you elect to power the face from cells in a FOIL PATTERN for Electronic Face. battery holder. If you use a battery holder, cement or bolt it to an insulated tool and check to sc that the "facial" pattern will the underside of the mounting see that each Schmitt trigger change with reasonable fre- board. oscillator section is switching. quency. A good place to start is Alternatively, you might want 48 Then adjust the time constants with the following settings: Continued on page 90

www.americanradiohistory.com RAY MARSTON

THIS ARTICLE CONTINUES THE RE- lay switching circuit theme of last month by presenting a selection of practical control circuits for electromagnetic relays. Last month's article discussed the basic operating principles and application rules for four well -known relay classes -the electromagnetic relay (EMR), the reed relay, the solid -state relay (SSR), and the CMOS bilat- eral switch. High -impedance relays. Electromagnetic and reed relays are low- impedance, elec- tromechanical devices whose typical coil impedance values range from tens to hundreds of ohms while input drive signal sources typically have much higher impedance values. Max- imum power is transferred between the input drive signal and the relay coil when the source and load impedances are matched. This is accomplished by in- erting additional circuitry between the input drive signal and the relay coil. These circuits can be either a transistor stage or a transistor stage with one or more IC logic gates. Figures 1 to 4 show four different ways to boost the input impedance of a Learn to design transistorized circuits relay with transistors and logic gates. that can switch and time relay functions Ti-ansistor Q1 in Fig. 1 is organized as a simple common - remotely with low -power input, emitter amplifier that increases the effective sensitivity of the 12 -volt coil of relay RY1 about relay sensitivity to a few volts. one hundred times (e.g., the Resistor RI puts safe limits OUTPUT current gain of Q1 in this circuit on the input current to Ql, and +12V 41-;- -0 is about 100). The introduction it also determines the effective of this amplifier stage reduces input impedance of the circuit. (The impedance is equal to the D1 RY1 1N4001 12V R1 about 1 kilohm.) RI value of plus >1200 +12V Diodes D1 and D2 damp the 5.6K OUTPUT coil's back EMF. (See last month's article.) The contacts of O1 D1 RY1 1I4PUT 2N3904 12V external R1 1N4001 relay RY1 can control 5.6K >1200 circuitry. Figure 1 is a schematic for a non -latching relay driver cir- D2 RY1 is OFF when the 1N4001 cuit. Relay FIG. 2-SELF -LATCHING TRANSISTOR- input voltage is less than 600 driven relay switching circuit. millivolts and ON when the input voltage exceeds a few volts. shown in Fig 2. Relay RY1 now open FIG. 1- NON -LATCHING TRANSISTOR - This driver circuit can be made has two sets of normally driven relay switching circuit. self- latching by modifying it as (NO) contacts; the upper set is 49

www.americanradiohistory.com for the relay's output and the +12V (VDD) lower set is for latching. The D1 14 latching set is in parallel with R2 A 1N4001 6.8K Q1, and it is actuated by nor- 1A4 mally closed (NC) switch Si. 01 As a result, these contacts by- TO PINS 2N3906 pass Q1 and self-latch RY1 after VIN ---. 5,6,8,9 the relay has been initially ener- Ri 12 & 13 OUTPUT VDD /2 10MEG Cl gized. Once it has self-latched, 0.1 RY1 12V the relay can be turned off again = 1N4001 >12052 only by opening Si or breaking 1 the power connection. The circuits of Figs. 1 and 2 have input impedances of only a FIG. 3 -HIGH- IMPEDANCE RELAY switching circuit. few thousand ohms. If desired, the input impedance can be +12v (VDD) raised to 10 megohms or more by driving Q1 through a CMOS OUTPUT buffer stage as shown in Figs. 3 RY1 and 4. In these circuits, the 12V CMOS buffer consists of one of >120t four NOR gates of a CD4001B quad, 2 -input NOR gate. The gate is wired as an inverter by short -circuiting its two input pins 1 and 2 together. Figure 3 has only a single CMOS inverter stage. Con- FIG. 4- MODIFIED HIGH -IMPEDANCE relay switching circuit. sequently, to ensure that the relay turns off when the input voltage low, +12V is transistor driver Q1 must be a PNP device, in this S2 D1 S1 14 R3 instance a 2N3906. In Fig. 4, SET RESET 1N4001 6.8K two CMOS inverter stages are (ON) (OFF) NA4 wired in series, so that the over- 01 all signal inversion is zero. Con- 2N3906 sequently, Q1 can be an NPN OUTPUT 4_0 transistor such as the 2N3904. D2 l RY1 It is worth noting in both i,4 4001B 1N4001 = 12v Figs. 3 and 4 that the input im- >12052 pedance actually equals the value of R1 3 R2 resistor Rl, and that the 100K 100K TO PINS relay actually turns ON (or OFF) 8,9,12 & 13 when the input signal exceeds (or drops below) about one half the supply voltage. This is the FIG. 5- BISTABLE RELAY SWITCHING circuit. transition voltage for the CD4001B CMOS input gate. At that value the gate operates in +12V = VDD the linear mode. Capacitor Cl D1 14 inhibits any high- frequency or S1 O R3 1N4001 (RESET) 1-1 transient signals that might ap- O 6.8K pear at the gate when the circuit is operated in the linear mode. 2N3906 To OUTPUT R1 Bistable circuits 0 100K A relay can be D2 RY1 organized for VIN 1/4 4001B 1N4001 = 12V bistable operation. In this mode (V9D) >1200 it turns on and self-latches when a SET R2 pushbutton switch 100K TO PINS is pressed, and it can be turned 8,9,12 & 13 off again only 1 by pressing a RESET pushbutton switch. Fig- ure 5 is the schematic for a 50 FIG. 6 -SELF- LATCHING, HIGH -impedance relay switching circuit. bistable relay switching circuit.

www.americanradiohistory.com +12V the RESET switch. This circuit VDD has an input impedance of 10 megohms. H>î .4. R3 --1-0 OUTPUT Figure 7 shows another prac- S2 do Li 0 S1 -- 7 5.6K tical pushbutton- operated relay 0 I 0 ON/OFF ON/OFF 01 RY1 switching circuit. A single LI 12V relay on and Q1 switch can turn the >1200 off, but many similar switches Y vvk CLOCK 1 per- R1 can be wired in parallel to RESET 1 2.2K D2 mit the relay to be remotely con- Cl D1 1 N4001 trolled from many different 06B ^ 9 SET 1 --- locations. The relay changes á switch t R2 CD4013B state each time an input 1MEG is pressed or released. As a result, if the relay is initially on, it will turn off when is But it can BINARY relay switching circuit. any switch pressed. FIG. 7- PUSHBUTTON- OPERATED be turned on again when any VDD switch is pressed after that. In that schematic, two NOR Therefore, the circuit exhibits a gates of a CD4001B CMOS NOR binary relay characteristic. SETI gate are set up as a simple man- The circuit in Fig. 7 is de- 5 2 D1 ually- activated bistable multi - signed around a CD4013B F/F1 IC 1 Q vibrator. One of its outputs is CMOS, dual D -type flip -flop CLOCKI 1 pinout di- 4 connected to the relay coil whose functional and RESETI are shown in Fig. 8. One 8 through the Q1 common -emit- agrams SET2 other fl_p -flop stage can be disabled by 12 - ter buffer stage. (Three 02 Q2 CD4000B series CMOS logic ICs grounding its input pins, and 11 F/F2 13 is CLOCK2 Q2 are also specified in this article: the other flip -flop configured 10 This RESET2 CD40013B, CD40017B and as a divide -by -two circuit. CD4020B. All are offered by Har- is done by shorting its g and D1 ris Semiconductor and many pins together. 17 to this VSS other suppliers). The input clock pulses a The circuit in Fig. 5 actually divide -by -two stage must have changes state as its SET or RESET rise times that are less than 15 1 14 Q1 VDD input signal rises through the microseconds; these are ob- 2 13 01 Q2 half supply voltage transition tained by pressing one of the 3 12 switches. Each CLOCK1 02 value of the CMOS gate. This pushbutton 4 11 response makes it easy to modi- time the switch contacts are RESETI CLOCK2 Cl 5 10 fy the circuit so that it acts as a closed, capacitor charges D1 RESET2 through the switch to 6 9 self -latching, high- impedance rapidly SETI D2 in Fig 6. provide the fast -rise time clock 7 8 relay, as shown VSS SET2 The relay turns on and self- pulse. Cl then discharges TOP VIEW latches when the input voltage Capacitor rises above th 2 transition value; slowly through R2 when the b be turned off switch is re- opened. This re- FLIP-FLOP the relay can then FIG. 8-CMOS DUAL D -TYPE only by removing or reducing sponse eliminates false trigger- CD4013B: functional diagram (a), and pi- by switch bounce or nout diagram (b). the input voltage and pressing ing caused

11 500W

D4 13 D2 1N4001 C1 R1 12 1N4001 ^ 470µF 2.2K D5 1 NY* 1N4001 4 IC1 11 D1 R4 4013B C2 12V AA 6 10 5.6K 12V C2 7"-. 47µF y 9 D3 068 7'. - 25V R2 a 1N4001 1 MEG *

FIG. 9-MULTIPLE- INPUT, AC- LINE -powered binary lamp and relay switching circuit.

www.americanradiohistory.com In the light control applica- +12V (VDD) tion, the circuit should be D1 t R2 R4 D 2 = 1N4001 680K 6.8K powered from the 120 -volt AC .11 = 1N4001 line. Figure 9 shows 14 how the cir- slY cuit in Fig. 7 can be modified to R5 operate from the AC line. 1ì-ans- 6,8K TO PINS 2N3906 former Ti must be selected to - 5,6,8,9 #R1 OUTPUT provide a 24 -volt, center- tapped T. Cl 12 & 13 10K C2 output (SEE TEXT) at 100 milliamperes or 0.1 D3 RY1 greater. 1N4001" 12V >1200 Timer circuits Relays can be put to work in a wide variety of timer or - FIG. 10- DELAYED- TURN time -ON RELAY switching circuit. delayed- switching applications with time delays from a fraction +12V of a second to tens of hours. Fig- ures 10 to 15 are practical exam- OUTPUT ples of timing circuits for relay s control. D1 R2 D1 T RY1 Figures 10 to 12 = 1N4001 680K R4 1N4001 12V show how 6.8K >1200 CD4001B CMOS NOR gate ICs ly2 4001B W. can produce time delays of up to R3 several minutes Q1 with reason- 10K D2 TO PINS 2N3904 able accuracy. The circuit in 5,6,8,9 1N4001 R1 Fig. 10 offers delayed turn-on re- C1 12 & 13 10K - C2 lay switching, and it operates as (SEE TEXT) { R5 follows: S 6.8K The CMOS gate is configured as F a simple digital inverter. Its output is fed to the base of PNP FIG. 11- AUTOMATIC TURN -OFF RELAY switching circuit. transistor Ql at the junction of resistor R5 and capacitor C2. The input to ICI is taken from +12V the junction of the time -con- R3 trolled potential divider formed si 14 680K by resistor R2 and 1. O START capacitor C R1 Before power is applied to the 1MEG I - OUTPUT circuit, capacitor Cl is fully dis- Cl 1M Cl (SEE TEXT) charged. Therefore, the inverter 01 D1 RY1 input is grounded, and its out- 1N4001= bt 12V >1200 put equals the positive supply voltage; transistor Q1 and relay RY1 are both off under this cir- D2 cuit condition. R2 2N3904 1N4001 When 100K power is applied to the TO PINS circuit, Cl charges through re- 8,9,12 & 13 sistor R2, and the exponentially rising voltage is applied to the input of the CMOS inverter FIG. 12- ONE -SHOT MULTIVIBRATOR TIMER relay switching circuit. gate. After a time delay determined by the RC time constant chatter. As a result, transistor ridor lights can be controlled values of capacitor Cl and re- Ql and the relay reliably change from several different locations. sistor R2, this voltage rises to state each time a pushbutton Approved insulated twin -lead the threshold value of the CMOS switch is pressed. cable connecting the compo- inverter gate. The circuit illustrated in Fig. nents can be concealed in the The gate's output then falls to- 7 will permit the relay to be ac- walls or along the baseboards. ward zero volts and drives tran- tuated from many different lo- Figure 8 shows the functional sistor Q1 and relay RY1 on. The cations. If this circuit is and pinout diagrams for the relay then remains on until installed for use in a home or CMOS, dual D -type flip-flop. It power is removed from the cir- office it is recommended that consists of two identical flip - cuit. When that occurs, capaci- approved switches suitable for flops. Each flip -flop has inde- tor Cl discharges rapidly use 120 -volt AC operation be in- pendent DATA. SET, and CLOCK through diode D1 and resistor 52 stalled. Hall, landing, or cor- inputs and Q and g outputs. Rl, completing the sequence.

www.americanradiohistory.com VDD +12V

R1 R2 t18 47K 22K 10 INPUT R3 Q1 9 PULSES 7 470K 8 4 Q4 01 TIME 05 5 IC1 1N4001 Q6 4 555 N OUTPUT 07 6 13 5 1 Cl O R1 08 S1 D2 12 100µF 1N4001 _+ 12V Q9 14 1FTART >12051 Q10 15 011 012 Q13 FIG. 13- SIMPLE 6- TO -60- SECOND timer relay switching circuit based on the 555 RESET 014 3 timer IC. 14 -STAGE RIPPLE +12V COUNTER

18 S1 VSS START a

R1 R2 F13 CD4020B 47K 22K 22K 1 ..." 16 F14 012 VDD 470K R5 8 4 2 15 4.7K 013 011 TIME 7 D1 3 14 IC1 1N4001 o Q14 010 555 13 S2 OUTPUT'' 4 06 Q8 C3 - '-O 5 12 MIN _ .. SEC A i Q5 09 0.1 no RY1 6 11 1N4001 ci 12V Q7 RESET C2 I S3 >120A 7 10 710011.F RESET Q4 8 9 Q1 Cl "SS 1000µF TOP VIEW cir- FIG. 14 -TWO -RANGE 6- TO -60- SECOND and 1 -to -10 minute timer -relay switching b cuit based on the 555 timer IC. FIG. 16-CMOS 14 -STAGE RIPPLE -CAR- RY binary counter CD4020B: functional +12V diagram (a), and pinout diagram (b). sponse is obtained by modify- relay stage for S1 ing the -driving START O an NPN transistor. It is worth noting that the cir- C3 R1 16 D1 8 4 Q1 cuits in Figs. 10 and 11 each 22K O1 I 1N4001 RESET 2N3906 provide a time delay of about 0.5 IC1 IC2 3 seconds for every microfarad in R2 555 4020B 39K o F15 the value of capacitor Cl. This CLK 8.8K F13 permits delays of up to several 470K 2 6 minutes. If desired, the delay TIME OUTPUT r-.-- Aki---0 periods can be made variable by D2 RYt replacing resistor R2 with a = 12V 1 -10 10-100 1N4001 fixed and a variable resistor in MIN o-MIN >120ß values are S2 series whose nominal R4 approximately equal to that of C2 1MEG 1.0µF R2. Cl í7C resistor POLYESTER 0.1 Figure 12 shows how a pair of CMOS gates can form a pushbutton- activated one -shot mul- cir- FIG. 15-TWO -RANGE 1 -TO -10 MINUTE and 10 -to- 100-minute timer -relay switching tivibrator relay- switching circuit based on the 555 and 4020B ICs. cuit that provides delays up to several minutes with reason- The relay turns Figure 11 shows how the cir- on when power is applied but able accuracy. cuit function of Fig. 10 can be turns off again automatically on as soon as START switch Si is reversed so that the relay turns after a preset delay. This re- closed. However, it turns off 53

www.americanradiohistory.com +12V

S1 O START

R1 .C3 16 D1 2.2K 0.1 al = 1N4001 RESET 2N3906 IC1 IC3 R2 16 39K 555 40208 W 14 o R6 R3 CLK p 6.8K 470K : 2 6 IC2 TIME 40178 15 `-0 OUTPUT

S2-a D2 ' RY1 1N4001 = 12V I --o-,3 . >12052 2 C2 C1 3C 1.2µF R4 0.12 POLYESTER R5 1MEG 27K .1

S2 TIMING RANGE SETTING

NO. TIME 1) 1 TO 12 MIN 2) 10 MIN TO 2 HRS 3) 100 MIN TO 20 HRS

FIG. 17-WIDE-RANGE TIMER -RELAY switching circuit spans 1 minute to 20 hours in three ranges with a three -step,two -deck rotary switch. again automatically after a pre- electrolytic capacitor Cl starts set delay of about 0.5 seconds 0 3 to charge toward the positive per microfarad of the value of power supply through 47 -kil- 1 2 capacitor Cl. The two CMOS ohm resistor R1 and 470 -kilo- 14 4 CLOCK '2 gates are configured as a man- hm trimmer potentiometer R3. 3' ually- triggered monostable The capacitor will continue to 13 CLOCK ,4 10 multivibrator whose output is charge until, after a delay deter- INHIBIT pw fed to 5 1 the relay through R4 and mined by the trimmer setting, 15 w transistor Ql. Cl rises to two- thirds of the RESET '6 = The circuits in Figs. 10 to 12 7. 6 W supply voltage. At that time, the are all based on simple CMOS IC1 changes state and the relay 6 gates, and they are intended for is turned turned off. The timing , 11 VDO-16 applications where high timing cycle is then complete. CARRY 12 accuracy is not required. Far A VSS=8 shortcoming of the simple OUT greater timing accuracy can be one -shot multivibrator relay obtained in circuits based on control circuit in Fig. 13 is that the 555 -type timer IC. Figures it permanently draws current a 13 to 16 show four practical from the supply -even when timer relay control circuits that the relay is off. Figure 14 is the include the 555 timer. schematic for a two -range timer If cD40176 you wish to learn more circuit that overcomes this about how to apply the 555 drawback. It is 1 16 capable of tim- 5 VDD timer IC (or brush up on what ing over a range of 6 seconds to 2 15 1 RESET you do know), refer to previous 10 minutes. The circuit oper- 3 14 Ò CLOCK articles in this series: page 58 of ates as follows: 4 13 the September and page 69 of 2 CLOCK INHIBIT When START switch SI is mo- 6 12 the October 1992 issues of Elec- mentarily closed, a START pulse 6 CARRY OUT Now. 6 11 tronics is sent to pin 2 of the ICI ' 7 9 Figure 13 is a circuit sche- through R3 and C3, and relay 7 10 3 4 matic for a simple 6 to 60 sec- RY1 turns on. The control con- 8 9 z VS3 8 ond timer-control circuit. The tacts then close, maintaining 555 IC is configured as a mono - the power connections to the E TOP VIEW stable multivibrator or a one - circuit when Si is released. The b shot multivibrator. The circuit circuit then runs through a tim- w FIG. 18 -CMOS FIVE -STAGE DECADE starts a timing cycle when START ing cycle that is similar to the COUNTER CD4017B: functional diagram switch Si is closed; relay RY1 is one described for Fig. 13. How- 54 (a), and pinout diagram (b). turned on immediately, and Continued on page 90

www.americanradiohistory.com Putting last month's PC breadboard hardware to work. BUILD THIS PC I/0 BREADBOARD

DAVE DAGE trically equivalent can be sub- ing chores are handled for you stituted. Figure 2 shows how to automatically by the BASIC in- SOME PEOPLE MASTER HARDWARE. mount the components on the terpreter. In addition, testing others master software -but breadboard. and experimenting with BASIC few master both. Those who do, The input circuit connects to is quick and easy because you however, can expect great report four, which appears at ad- can execute code in the immedi- wards. Last month's project was dress 260 decimal (0104 hex) if ate mode, rather than running building the hardware: a PC in- you configured the interface "source code" through a pro- terface card and a breadboard card at the default base I/O port gram called a compiler. system with ten fully decoded address. Resistors R2a R2h BASIC also has disadvan- and latched input/output (I /O) pull all eight low By tages that include speed, ports. This month's article is switching the poles of the DIP awkward bit -level manipula- about the software required to switch, you can pull each line tion, and variables that are al- make the hardware do some- high through resistors ways global. An interpreted thing interesting. Along the R3aR3h. BASIC program is much slower way, you'll learn how to bread- The output circuit also con- than an equivalent compiled board some hardware for dem- nects to port four (260 decimal, program in almost any other onstrating input and output 0104 hex). The output lines can language. Bit -level manipula- capabilities, and you'll see soft- drive each of the eight LEDs tion can be troublesome for peo- ware examples in three popular that are tied to ground through ple who want to work directly computer languages: BASIC, current -limiting resistors with hardware. The problem assembler, and C. Rla Rlh. An LED will turn on with global variables is that It will be helpful if you have when the associated data line simple typographical errors had some experience with pro- goes high, and off when it is low. make it easy to create hard -to- gramming in at least one of Now let's see how to use the debug problems, particularly in those languages. But if not, software to read the switches those large programs with lots don't worry-this presentation and light the lights. First I'll dis- of variables. allows for inexperience. If you cuss the BASIC language, then Despite those disadvantages, are just beginning to program, assembler, and then C. BASIC is ideal in situations it's better to learn two -or where speed is not a require- more -languages at the same BASIC programming ment, the program is not large, time. Most programming lan- BASIC, as supplied with and quick development and guages do the same things; DOS, is an interpreted lan- testing are paramount. learning several will help you guage. When you run a BASIC Listing 1 shows a simple place the statements and pro- program, you are running the BASIC program that will read cedures of each in perspective. large BASIC.EXE program, the input port, transfer the data which takes each statement one to the output port, and then re- Hardware setup at a time, "interpreting" what it peat the process indefinitely. To begin, breadboard the cir- means, and then executing it. The overall effect of this pro- cuit shown in Fig. 1. The sche- As with any programming gram is that the switches di- matic specifies the resistor net- language, BASIC has advan- rectly control the LEDs. (Press works, a DIP switch, and LED tages and disadvantages. Ctrl -Break when you've had bargraph indicator, but any dis- BASIC'S advantages include enough.) crete components that are elec- simple setup; most housekeep- The objective of this program 55

www.americanradiohistory.com OUTPUT PORT 4 but assembler requires careful forethought in planning those DO D1 D2 D3 D4 D5 D8 D7 tasks. However, it's easy to control the hardware in assembler. 0 C C Every LEDa-LEDh microprocessor has its BAR GRAPH own assembly language. Intel's v OR DISCRETE LEI 80X86 family has one, Motorola's 68XXX family has R1a-R1h another, and so on. Moreover, 8 x 22052 within a given microprocessor family, successive additions to the family usually call for new INPUT PORT 4 instructions specific to that DO D1 D2 D3 D4 D5 D6 D7 more advanced device. Some microprocessors have a 0 0 single address space that is oc- VCC Vcc cupied by both system random - access memory (RAM) and I/O R3a-R3h ports. Other CPUs have sepa- 8 x 330 rate locations for memory and I/ O. Intel CPUs, for example, have I 1 S1 a-S1 h separate memory and I/O loca- 8 x SPST tions. In this architecture, the - CPU and I/O devices share com- R2a-R2h mon address and data buses; 8x1K separate CPU control signals determine whether a given operation occurs in an address space or an I/O space. FIG. 1- SCHEMATIC DIAGRAM OF TEST CIRCUIT: The input port reads an eight - In the 80X86 position DIP switch, and the output port drives an eight -LED bargraph. microprocessor family, different instructions allow the transfer of one, two, or is to show that the computer Assembly language four bytes of data simulta- really controls the connection programming neously between an I/O port and between the two ports. You If BASIC represents one end the CPU's accumulator, orA reg- could write a program that of the programming -language ister. The CPU can specify would switch a light on or off spectrum, assembler or assem- which port participates in a only after a password has been bly language represents the transfer in several ways. In as- entered. Similarly, you could other. Where BASIC is slow and sembly language, the port can write a program so that the cumbersome, assembler is be selected by an immediate switch that controls a par- quick and lithe. On the other value, which is actually part of ticular LED could be changed to hand, it's easy to perform tests the instruction the CPU ex- control a completely different and do experiments in BASIC, ecutes. Another way to select a LED without rewiring the port is to preload the DX regis- board. 'fry doing something like ter with the address of the desir- that without using LISTING 1- SIMPLE TEST software- PROGRAM ed port, and then execute a it's next to impossible! slightly different 10 N = INP (260) instruction. Another possibility would be Figure 3 shows the register to assign the input and output 20 OUT 260, N 30 GOTO 10 model for the 8086 CPU. Later ports for completely separate members of the Intel family ex- purposes. For example, the DIP switch could serve as eight additional function keys for a spe- LISTING 2- LEDSWING.BAS cial program, and the LEDs could function as a bargraph 100 REM * for ST -1. Purpose: walk a single bit back and forth for display on displaying, for example, the 110 REM * a LED bar indicator. Hardware: LED bar indicator, limit resistors. 120 REM * Note: TON (line 180) is loop delay, increase for faster cmptrs. time remaining in some par- 130 REM ************************************** * ** * * * * * * * * * * * * * * * * ** * * * ** ** * ** ticular process. 140 REM * AO address output port, TON time LED is on, TOFF time LED is off. 150 REM ************************************** * * * ** * ** ** * * * * * * * * * * * ** * * * * * *** Of course, it's also possible to 160 CLS:REM START have some 170 INPUT Enter output port address in decimal ";AO fun with the circuit. 180 TON =500 : REM increase to slow cycling. Try 500 to 5000. Listing 2 provides one example. 190 FOR C =1 TO 7 200 OUT A0,2 ^C: FOR T=1 TO TON:NEXT T (Depending on the speed of your 210 NEXT C computer, you might have 220 FOR C =6 TO 0 STEP -1 to ad- 230 OUT AO,2 ^C: FOR T =1 TO TON:NEXT T just the value of the time delay 240 NEXT C in line 190.) 250 LOTO 190

www.americanradiohistory.com preload INPUT PORT 260 OUTPUT PORT 260 sembly program must the DX register with the desired 1 2 3 4 6 7 O 1 2 34 5 6 7 0 5 hexadecimal port address. In

o O 0 Listing 3, the first instruction o o O 011111111 O 0 0 0 0 O moves port address 0104h into o o O 000000000 O 0000000000000 o 0 0 0 0 0 0 0 0 0 O O DX register. The second in- o o L R2 1000 OHMS 0 0 0 0 0 0 0 the o o 00 0000000 0 0 0 0 0 0 O 000000 O 0 o O 0 struction transfers the data o o 0 0 0 0 0 o O 0 byte from the I/O port specified s1 LEDI by DX into register AL. Then the value back O 0 00 0 0 0 0 L__ 000 CPU writes this same O O O 0 00 0 0 0 0 0 0 0 0 00 000 O 000000 00 0 out to the same I/O port. Last, O 0 O 0 00 00000000 0 0 0 0 0 O 000000 O 00 the program jumps back to line O 0 R3 33 OHMS o O O R1 220 OHMS 0 0 O O 2 to continue to the process in- O 0 O 0 000000000 O 0 0 00000000000 definitely. Instead of using a GOTO statement with a line 00 0 O 00000 O 0 0 0 0 O 0 0 0 0 O 0000-. VCC number, an assembly-language O O O O O O 0 0 0 0 0 O 0 0 Q 0 O 0000 0o00-Z GND program uses labels such as "loop 1" in the example. FIG. 2 -PARTS PLACEMENT DIAGRAM for the test circuit. Parts placement is not To enter and execute an as- critical; just be sure the power -supply polarity is not reversed. sembly- language program, you will need a program that can translate the assembler statements into machine code. This kind of program is called an as- AX AH AL ACCUMULATOR sembler. A full- featured as- BX BH BL BASE sembler such as MASM (Micro- CX CH CL COUNT soft), TASM (Borland), orA86 (a DX DH DL DATA shareware product by Eric Isaa- cson) will assign addresses to SP STACK POINTER labels, keep track of data by BP BASE POINTER name, and much more. How- SI SOURCE INDEX ever, for simple test programs,

DI DESTINATION INDEX those programs are more comprehensive than necessary. For IP INSTRUCTION POINTER the purposes of this project, the FLAGSH FLAGSL STATUS FLAGS DOS program DEBUG.COM will suffice. CS CODE SEGMENT DS DATA SEGMENT Debug SS STACK SEGMENT A version of DEBUG is pack- ES EXTRA SEGMENT aged with every copy of DOS. Unfortunately, it's one of the most user -unfriendly programs ever written. To make things FIG. 3 -INTEL MICROPROCESSOR REGISTER MODEL shows the 16 -bit register for- easy on yourself, set up a sepa- mat common to the 8088, 8086, 80186, and 80286 CPUs. The 386 and higher -level CPUs have 32 -bit wide registers. rate directory (or use a separate floppy disk) just for DEBUG and tend the architecture of the through the lower half of the ac- the assembly programs that you model, but all are backward cumulator, designated AL. will write. DEBUG is normally compatible with it. Note that The assembly -language in- installed in your DOS directory, the main registers (AX, BX, CX, structions for reading and writ- so you should be able to run it and DX) are 16 bits wide, but ing a port specified by the DX directly from your test directory. they can be addressed in 8 -bit register are, respectively, IN AL, Now execute the program. blocks: AL and AH (A low and A DX and OUT DX, AL. Those in- You should see its prompt, a high), and so on. The 80386 structions assemble to hex- simple hyphen. Press "A" fol- and more powerful CPUs extend adecimal machine -code values lowed by Enter. This puts DE- the concept to the 32 -bit level. EC and EE, respectively. At this BUG into its Assemble mode. The number of bits that can time you should know how to be transferred to or from an I/O build an assembly -language version of our earlier BASIC test LISTING 3- port simultaneously depends ASSEMBLER TEST PROGRAM on the CPU's capability, and on program. See Listing 3. the interface hardware. This The only difference between mov dx, 104 interface card works at the BASIC program and the as- loopl: in al, dx project's out dx, al the byte level, so only eight bits sembly program is that the as- jmp loopl can be transferred at a time, sembly program is that the as- 57

www.americanradiohistory.com The program will display eight ter the actual CPU offset After you enter the first line hexadecimal digits, divided address. That's why you see jmp ( "r cx "), DEBUG displays the into two groups of four sepa- 0103 at offset 0105. After enter- current value of CX and pre- rated by a colon. The value on ing the final instruction, press sents a colon (:) prompt. Enter 7 the left is called the segment ad- Enter again, and you'll return to followed by Enter. Repeat the dress, and the value on the right the DEBUG prompt. process with BX. 'b accept the is called the offset address. The Before running the program, currently displayed value, just segment address, shown here save it. First name the program press Enter. as "xxxx" might vary from ma- with DEBUG's "n" command: The next step is to write the chine to machine; for small profile to disk. Press "w" followed by grams, its value doesn't matter. Enter. Debug will respond with 'lb determine the actual address LISTING 4 -DEBUG the number of bytes it is writ- associated with a seg- PROGRAM SW2LED ing. Verify that the value dis- ment:offset pair, multiply the played is correct: segment by 16 (10 hex) -a100 and then xxxx:0100 mov dx, 104 -w add the offset. For example, hex xxxx:0103 in al, dx Writing 00007 bytes address 2345:0006 = 23450 + xxxx:0104 out dx, al Be certain the value is correct 0006 = 23456. xxxx:0105 jmp 0103 xxxx:0107 before proceeding -you'll see The offset address, on the why in a moment. Now run the other hand, is critical. If you program by entering "g" (go) at don't deliberately specify a val- the prompt. The hardware ue, DEBUG begins assembly at LISTING 5 -DEBUG should respond just as it did location O100h (256 decimal). PROGRAM SW2LED2 with the BASIC program; cyc- DOS allocates the first 256 -byte ling the DIP switch positions block of memory within a given mov dx, 104 will cycle the corresponding segment to store information loopi: in al, dx LEDs. about small COM out dx,a1 programs of shl al There are, however, two major the kind being developed here. jnc loopl differences between the BASIC That block is a historical rem- mov ah,0 and the assembly program. The nant from an earlier program- int 21 assembly program runs much ming language, CP /M; it's of- faster, and pressing Ctrl -Break ficially called the PSP or Pro- does not halt the program. With gram Segment Prefix. Leave the LISTING 6-C LANGUAGE PROGRAM mechanical switches, the speed PSP alone; don't try to place difference is insignificant, but if code or *include data there. (By the way. main() you are not able to stop the pro- DOS's EXE file format does int not inp(unsigned), outp(uneigned, int) gram and regain control, the use the PSP. In while(1) addition, COM ( only thing to do is reboot. programs outp(260,inp(260)); are limited to 64K of _ase mov ah, 11 Now return to the am int 33 test directo- code space, whereas EXE pro- ry, load DEBUG, and reload the grams can be much larger.) test program. Loading a file is a Intel CPUs have a set of regis- step that is opposite to writing ters called segment registers: -n SW2LED.COM it: first name it using "n," then code segment (CS), data seg- Drive and path are optional, but load it using "1:" ment (DS), stack segment (SS), for this project unnecessary, be- -n SW2LED.COM and extra segment (ES). The cause the default directory has -1 segment registers typically been specifically set aside for How will you know that the function as indexes into vari- our test programs. correct program loaded? 'ay the ous areas of memory. By default, DEBUG's "w" command unassemble command, "u." DEBUG loads the current seg- writes current memory con- The assemble command used ment address into each of those tents to disk. However, you previously converts assembly- registers. must specify the exact number language instructions into hex- Notice that the stack pointer of bytes in two registers: BX and adecimal bytes that are ex- (SP) is initialized at offset FFFE, CX. For anything less than 64 ecuted by the CPU, the unas- and the instruction pointer (IP, Kbytes, BX will contain zero and semble command (sometimes also called the program counter) CX the remainder. The test pro- called the disassemble com- is set to offset 0100. gram is only seven bytes long. mand) converts hex bytes into You now have a 64K block of So enter 0000 and 0007 into assembly -language instruc- memory ready for the entry of registers BX and CX as follows: tions that can be understood by programs. Enter the code -r cx < enter> people. Issue the following com- shown in Listing 4 at the DE- CX 0000 mand to disassemble the test BUG prompt. :7 program: Unfortunately, you cannot -r bx < enter> -u 100 L7 use symbolic addresses (e.g., BX 0000 The "u" stands for unassem- the loopl in the previous exam- : < enter> ble, 100 is the starting address, ple) with DEBUG; you must en- and L7 instructs the program to

www.americanradiohistory.com disassemble seven bytes begin- should be able to read the docu- C language programming ning at that address. mentation for DEBUG and learn Earlier BASIC and assembler DEBUG should display a list how to use the rest of its com- were defined as opposite ends of of program instructions identi- mands. Although cryptic, DE- the programming -language cal to that in Listing 4. BUG is a powerful tool for spectrum. A broad range of writing and debugging new pro- other languages occupy posi- Graceful ending grams and for exploring your tions all along that speed -per- For the final assembly -lan- computer system and its config- formance spectrum. For exam- guage exercise, the program is uration. You might want to rec- ple, C language has gained made a little more "intelligent." ord all of the commands and tremendous popularity during The program can be allowed to parameters on a handy card for the past decade. Like BASIC, it end gracefully, so you don't have future reference. is a high -level language, but it is to reset the computer to halt the The following information re- really closer in many of its program. One way of doing it is lated to the speed difference be- characteristics to assembly lan- to use DIP switch position 8 as a tween the assembler and BASIC guage. Indeed, C has been de- "break" key. After each pass versions of this program is in- scribed as a "portable assembly through the read -switches, teresting. On a standard 4.77 - language." write -LEDs loop, check switch MHz PC, the BASIC program C is a compiled language like 8. If it's on, end the program: loop executes in about 2.25 mil- FORTRAN, COBOL, Pascal, and otherwise continue. liseconds. By contrast, the as- even some versions of BASIC. The shift instruction pro- sembler version takes about 9 You start by writing source code vides a simple way to do this in microseconds. In other words, that is similar to BASIC. How- assembly language. You will the assembly -language pro- ever, C has no interpreter that shift bit 8 out of the ac- gram ran about 250 times faster runs it one line at a time. In- cumulator and into a special than the BASIC program! stead, the source code is com- register called the carryflag. As piled into machine language its name implies, the carry flag that the CPU executes directly. is normally used for arithmetic GLOSSARY OF TERMS As part of the compilation process, the compiler flags syntax instructions. But it's also useful Assembler-A computer program that for determining the flow of a converts or translates assembly lan- errors (e.g., typos, undeclared program based on the state of guage source code instructions into ma- variables, and misspelled lan- some condition -for example, chine language. guage elements), that must be the on or off state of a DIP Compiler-A computer program or cir- corrected before the machine switch. cuitry that translates a high -level lan- code will be generated. Next, guage into an executable program in a you have the option of linking Listing 5 shows how all these single operation. See assembler and instructions tie together. As be- interpreter. the machine code with other fore, preload DX with 0104h, in- Global variable -A variable in a com- predefined code libraries. When put the byte from the port at puter program that can be shared by any the process is complete, you will that address, then write it back object or subroutine within the program. have a stand -alone file that will High -level language -An application - run from the DOS prompt. out. Now for a surprise. The "shl language, as dis- oriented programming Modern C development en- al" instruction causes the CPU tinguished from a machine -oriented pro- to shift the contents of its AL gramming language. It is also termed a vironments combine all the register left one bit position, computer language. Examples are tools necessary for editing, moving the most -significant bit BASIC and C. compiling, and linking C code into the carry flag. The follow- Interpreter-A computer executive into a single, integrated de- ing instruction tells the CPU to routine that translates a program in velopment environment (IDE). high -level language or code into main jump back to the input instruc- chine language or code. Unlike a com- The preeminent products tion (at address loopl) if the car- piler, the interpreter translates and this category include Borland's ry bit is not set -i.e., if the executes one line at a time. See Thrbo C and Microsoft's Quick switch is off. If this is not done, assembler and compiler. C. For entry-level programmers, the program executes a special Machine code -Instructions executed an IDE is recommended. Even pair of instructions that will re- by a computer processor. It is also called experienced programmers can machine language. pro- turn control to the calling pro- Machine instruction -An instruction significantly increase their gram. written in a programming language that gramming productivity with an Following the procedure pre- a computer can recognize and under- IDE. viously outlined, enter the pro- stand without translation. Both Quick C and lùrbo C in- gram in DEBUG, and save it to Register -A circuit in computers or clude a special feature called in- disk with a new name other digital circuitry that holds data in line assembly, which allows binary format for process or transfer. you to embed assembly -lan- (SW2LED2.COM). Remember Source language -The language in that you must enter the address which a problem is programmed for a guage programming instruc- of loopl with the hex address, computer. It must be translated into an tions in the middle of a C not the symbolic constant. object program in machine language by program. Inline assembly thus Other than that, the program's an assembler, compiler, or interpreter. gives you the best of both Source program -A program that is worlds: the low-level hardware operation is straightforward. written in source language or code. With this introduction, you Continued on page 89 59

www.americanradiohistory.com FOR AS LONG AS SHORTWAVE LIS- on frequency. Matching that im- tening has been popular, it has pedance to the input imped- ANTENNA been difficult to match a ran- ance of a receiver is possible, dom- length antenna to the typ- but it can be complicated. SHORTWAVE ANTENNA RECEIVER ical 50- or 75 -ohm input Many different active- anten- HEAD impedance of most radio re- na designs provide effective ceivers. The impedance of a ran- matching, but many people be- COAXIAL dom- length shortwave antenna lieve that active antennas never CABLE ANTENNA can vary from a few ohms to sev- work satisfactorily. An active CONTROLLER eral hundred ohms, depending antenna is typically a single - stage, wideband amplifier with FIG.1 -THE TUNABLE SHORTWAVE an- a gain from 5 to 8 dB and a noise tenna adds a tuned stage ahead of the figure from 3 to 8 dB, making it 50- or 75 -ohm input to your shortwave a device of questionable merits. receiver. While active antennas provide Active antenna wideband am- some gain, they can also add plifiers really lose out in the low noise to the signal, especially a microvolt region. The inherent signal at a low microvolt level. noise usually kills a low-level incoming signal. Nearby transmitters might cause inter - modulation in the active antennas as well. As a compromise solution, some older shortwave receivers had trimmer potenti- TUNABLE ometers on their front panels to provide impedance matches for the antenna at the received frequency. Sadly, modern receivers SHORTWAVE no longer have this control. The author believed that a new method had to be designed to meet the following list of ANTENNA provisions: 1 -No amplification should be needed, no noise should be generated, and no intermodulation Improve your shortwave should occur 2 -It should have selectivity, reception with this but keep out strong adjacent signals tunable antenna. 3-It should be small 4 -It should be inexpensive, easy to build, and include only standard components H.J. WECKE The solution was found by adding a tuned stage in front of the 50- or 75 -ohm input to the shortwave receiver. A tuned stage has many advantages over the best wideband RF amplifiers, including preselection at resonance and elimination of both noise and intermodulation. The need for tracking the antenna from band to band is OFF AUXILIARY TUNING RANGE the only disadvantage this so OHM ANTENNA MEGAHERZ ,z tuned stage has over a wide - TERMINATION 9 e ,, band active antenna. Several 7 \ prototype antennas have been 6.5 in service reliably for more than four years. They have been mounted on a balcony or a roof where they were exposed to a climate. Figure 1 is a wa... AMU ANTENNA CONTROLLER harsh 60 block diagram of the system.

www.americanradiohistory.com r PARTS LIST .1.

C6 All resistors are /4-watt,1 10 %, unless i B1 J., ' TO 9V .002 otherwise noted S.W. R1-220,000 ohms, 10% IRECEIVER R2- 100,000 ohms, 10% ANT S1 -a S1-b OFF R3- 12,000 ohms, 10% (5052) O R4- 100,000 ohms, linear O TUN. L---1 C3 AUX. ANT. potentiometer ANT. 22µF R5-51 ohms, 10% R4 C5 Capacitors 100K Cl, C2, C4-C6-0.002 µF, ceramic R5 .002 TUNING RF, 16 volts, electrolytic 510 C3-22 - Semiconductors R3 r D1- Motorola MVAM -109 varactor di- 12K 1 ode (nominal capacitance of 460 pF I J3 - at VR = 1.0 V and f = 1.0 MHz) or R2 C4 L_, AUX. 100K .002 equivalent ANT. Other components IN I L1 -1.6 µH (wind by hand, see text) J1 J2 J1, panel -mount F connector TUNABLE L J2- L suited ANTENNA HEAD ANT. ANTENNA CONTROLLER J3, J4-any coaxial connectors IN to your needs B1 -9 -volt carbon -zinc battery (do not use alkaline) FIG. 2- TUNABLE ANTENNA SCHEMATIC. The variable element is Motorola S1 -pole, 3- position rotary switch MVAM -109 diode Dl. -2 (optional, see text) Miscellaneous: Antenna, two cases, silicone sealer, coaxial cable, No. 26 Circuitry wire, 1/4-inch form with ferrite 2 for magnet Figure is the schematic slug, 9 -volt battery snap connector the tunable antenna system. A Note: The following items are avail- single monopole antenna about able from Wecke Associates, P.O. 3 feet long was chosen. The an- Box 3822, Ottawa, Canada K1Y tenna, which has a measured 4M5: capacitance of approximately 10 A kit consisting of D1, L1, and 6 of the mm bolt, nut, and solder lug to ac- picofarads, becomes part commodate a 30-inch automotive antenna -head circuit that feeds whip antenna -$6.00 + $2.00 S &H the antenna controller. The Assembled and tested antenna variable element of the antenna controller, antenna head, and alu- head is a Motorola MVAM -109 minum mounting bracket with U- not include (D1). The inductor value bolts and battery (does diode whip antenna or connecting ca- required to cover the shortwave bles)- $65.00 + $5.00 S &H spectrum from about 6 MHz to Payment required in US dollars. Ca- 18 MHz was calculated to be 1.6 nadian customers please add ap- microhenries. The inductor can propriate provincial taxes. Allow easily be wound by hand on a 3-4 weeks for delivery. 0.25 -inch diameter form containing a ferrite slug. The MVAM -109 requires a Construction be tuning voltage from 1 to 9 volts The antenna head can con- DC at a low current. That is pro- FIG. 3 -THE ANTENNA SHOULD be hand wired on perforated vided by 100 -kilohm linear po- mounted to the antenna-head case with struction board and installed in tentiometer R4 located in the a neoprene washer, and a bead of sil- any weathertight case. Good. antenna controller section. icone sealant should be applied to the clean solder joints are impor- Switch Si. when in the "off' po- edge of the lid to keep out water. tant in the antenna head. which sition, places a 50 -ohm termi- will probably be exposed to the nation on the tuned output. weather. The layout of the parts The other two positions of Si and wiring is not critical just select either an auxiliary anten- avoid excessive lead lengths. na input or the tuned antenna The case selected for the pro- input. A length of coaxial cable totype antenna head has an alu- terminated with suitable con- minum cover that can be used nectors connects the antenna as a base for attaching a mount- head, which might be located ing bracket crafted from scrap outdoors, to the antenna con- aluminum. Coil L1 can be made by winding 16 turns of No. 26 troller, which should be located FIG. ANTENNA CONTROLLER unit. 4- /a in a convenient place near your House the controller in a metal case to magnet wire on a' -inch diame- shortwave receiver. provide RFI shielding. Continued on page 90 61

www.americanradiohistory.com ALTHOUGH PLAYING COMPUTER comfortable to use. A such as and, or, and exclusive - games can be a lot of fun, oper- piezoelectric buzzer provides or. Finally, four non -game ating them teaches you very lit- game sound effects. modes create sound effects and tle about how they work. A good light- pattern displays. way to learn how electronic Features games work is to build your The games and functions of Circuitry own. This article shows you the C -Game are selected by Figure 1 is the schematic of how to build the C -Game, a two- pressing one of the 16 pushbut- the C -Game. The circuit is de- tons after the device is reset. A signed around IC3, an 80C31 new game can be selected at any ROMless, CMOS version of In- BUILD THIS tel's 8051 8 -bit microcontroller. The 80C31 has four 8 -bit I/O ports (0 to 3). Port 1 is connected to 16 pushbuttons, organized as two COMPUTERIZED GAME banks of eight (Bank -A and Bank -B). The 16 1N914 diodes (D1 -D16) isolate each bank from the other. Each bank has one side of each pushbutton connected in common to one pin of Port 3 of the 80C31. These two pins (12 and 13, P3 -2 and P3 -3, respectively) enable the switch banks separately so that they can be periodically read under software control. Port 0 of the microcontroller communicates with the 27C256 EPROM (IC1), where C- Game's software is stored. The address and data buses of the microcontroller are multiplexed. A 74HCT573 8 -bit latch (IC2) is first strobed with the ALE (address latch enable) signal from the microcontroller, and the low -order address data is latched for the EPROM. The high -order address for the Learn how EPROM is output by port 2, pins electronic games work; then 21 to 27. The EPROM is enabled have fun playing one that you built. by the microcontroller's PSEN (program store enable) line. Port 0 also connects to IC4, a DAN RETZINGER 74HCT574 8 bit D -type flip -flop that drives two banks of eight player game with a dozen dif- time by pressing the reset LEDs. Port 3 (P3 -0 and P3 -1) en- ferent game modes. In addition switch followed by another ables each bank separately to the 12 games, there are four pushbutton. Once a game is se- through Ql and Q2. Each bank other modes that let you gener- lected, the operation of all push- is multiplexed under software ate sound effects and light -pat- buttons and LEDs are specific control and is turned on ap- tern displays. to that game. proximately 50% of the time. The C -Game has 16 pushbut- Of the twelve games, three are Port 3 bit -4 (pin 14) connects tons for player input, and it has reaction -time (who's quickest) to a transducer. Components 16 LEDs for display output. competitions. Four games in- R5, R6, and C8 provide a signal Eight LEDs and pushbuttons volve skill and thought, and two through output jack J2 for con- are arranged along each side of others are simple memory chal- nection to the line -level input of the device, making it conve- lenges. The C -Game also has an external amplifier to produce nient for two players to sit op- two binary arithmetic contests a louder sound output. posite each other while playing in which you must add, sub- At power up, C2 and RI ini- a game. The pushbuttons are tract, divide, and multiply two tialize the microcontroller. Re- installed with the same spacing binary numbers. (It's not as dif- set switch S17 will reset the as found on a standard comput- ficult as it sounds!) Another circuit to power -up conditions 62 er keyboard, which makes them game performs logic functions at any time. An oscillator is

www.americanradiohistory.com .5V

+5V C6 1µF V00 07 N BANK A BANK B DO L DO +5V 12 LED1 18 D4 07 +5V D3 40 fED2 D2 06 C2 VCC D1 RESET 10µF DO 103 05 S17 25V Z 80C31 OE RESET P3 4 5V 04 +5V 4.- 0 O 1C4 8 XTAL R5 74HCT574 03 C3 100K 4MHz I J2 30pF Q O R1 X-AL1 EXT. AMP. 02 C8 q 10K 19 OUT N I XTAL R6 .1 01 = C4 28 P^7 4.7K 30pF 27 P26 1 11 CK 00 28 P25 (P3 6) 25 P24 GND 10 24 P23 8 23 P22 VCC 01 02 22 1 P21 P3.0 2N3906 2143906 'Cl 21 P20 27C256 1 P3 1 VPP A14 27 15 A13 26 P3.5 +5V P3.7 17 Al 2 (RD) A71 20 BANK A BANK B A10 VCC 01 ..1..21 D16 t16 8 A9 IC2 017 --04-0 O- 128 -11F-4 O- 128 25 A8 74HCT573 P16 D2 ..T.S2 015 Z75 19 D7 A7 07 D P07 --104--43 0-0 64 -}-OTO- 64 P15 4 18 33 D6 A6 06 D6 P06 D3 014 y14 P14 _ 32 0-41 32 5 17 34 -04-0 C- ---0.1-0 05 AS 05 D5 P05 4 P13 6 16 35 D4 D13 T..213 D4 A4 D4 PO4 04 P12 3 --194-0 0-41 18 ---114--0 0-41 16 15 36 D3 A3 D3 P03 012 > 03 P11 D5 12 8 14 37 _ 8 > AS D2 P02 ---191--0 C-41 8 ----04--0 0-0 D2 02 P10 9 13 38 P01 D6 D1 Al 01 01 C-11 4 0- 4 10 12 39 P00 ----0 AO 00 DO DO D7 ..127 010 ..1.21° 20 CS -0.1--o C- 2 -}--0 0-* 2 0 OE OF LE ALE D8 D9 1 1 0--41 GND --I--O C-4/ --114-0 10 1 14 P3 2 114914 (+16) 1 PSEN P3 3 BI EA V05 J1 ,31 120 O I - 9V -1 }OpFF 5V O A_ O S18 POWER g POWER

FIG. 1-C -GAME SCHEMATIC. The circuit is designed around an Intel 80C31 8 -bit microcontroller. 9 -volt battery, but power-input jack J1 can provide auxiliary made up of a 4 -MHz crystal volt regulator IC5 will tolerate a power to the C -Game with any (XTAL1) and two 30 pF capaci- reversed battery voltage of 15 power adapter capable of sup- tors (C3 and C4). An volts without damage. The cir- plying 6 to 9 volts DC at 100 LM2931Z -5.0 low- dropout 5- cuit is normally powered from a milliamperes or greater. 63

www.americanradiohistory.com -. )_ ,. :- . V - . v -r l, ,' ,/ fl _ . :r'.. .~_. ti: L._,`/ .. . J ---,` ;'.,.- L _,-_ .-1.- o7 I.-- -.

5 NG*ES 5 INCHES

COMPONENT SIDE OF THE PC BOARD. SOLDER SIDE OF THE PC BOARD.

a Designing a battery- powered SIDE circuit with this many LEDs and components requires some special considerations. All ICs LED9 (except the regulator) are CMOS to conserve battery power -a non -CMOS 74LS574 would require approximately 27 milliamperes more current than the CMOS version, and the non - CMOS version of the 8031 mi- -, crocontroller would need almost e" 100 milliamperes extra. 1 Second, ..Jl.kgf..i the 80C31 is clocked 111Ir tr + by a 4 -MHz crystal. Although n.sr most 80C31 controllers can op- u erate at speeds up to 12 -MHz, . the lower speed keeps power consumption to a minimum. Current drain is directly related oS NM:.:iA: ,;jIB 1'RTT to the clock speed in this CMOS microcontroller. / Third, all ---."a LEDs in each bank .. share one common N. -* RES- -cathode re- ,I.r1:.Mlwr,_.r..: sistor (R3 for Bank -A and R4 for Bank -B), instead of one resistor m per LED. That results in less current per LED if many LEDs P P r are turned on, and more cur- .. 4 rent per LED if fewer LEDs are turned on. When only one or two LEDs are on, current is limited by the 74HCT574. When more LEDs turn on, current is A limited by R3 and R4. However, SIDE the change in brightness is FIG. 2- PARTS-PLACEMENT DIAGRAM. Solder the 1N914 diodes first, then the re- barely noticeable with a differ- 64 sistors and capacitors. ing numbers of LEDs on.

www.americanradiohistory.com mf/i ó r 4m Q cv *-- TABLE 1 -GAME INSTRUCTIONS

X Al X Who's Quickest #1 First player to press the key next to his lit LED gets a Point. Most points out of 20 wins. X A2 X Road Kill Most 'hits' (press key while LED on) out of 20 wins. A4 X Tennis Press a key to send a ball (LED) to your opponent. Fewest X misses (press key before time -out) out of 40 wins. A8 X Reaction Timer Test your reflex time. Press a key to shut off the LED. X Gives an average time for 10 hits. Al6 X Race Around "A" player sends LED counterclockwise, "B" player clockwise. X If LED slips past you, other player gets a point. A32 X Binary Math Use "A128" to enter your answer for add /sub /divide /multiply on two 14 bit binary numbers. "B" LED's show progress. A64 X Binary Logic Use key "A128" to enter your answer for and /or /xor /modulus on two 4 bit binary numbers. "B" LED's show progress. A128 X Count to 64 Use key "A128" to repeatedly add original number shown until X you've counted to 64 or greater. "B" side keeps your time. X B1 X Who's Quickest #2 First player to press all lit keys gets a point. Best out of 20. B2 X Memory #1 A number will be shown. Use key "A128" to enter each number in the "sequence" correctly. 10 total in sequence. B4 X Memory #2 Alternate play. Two players build and copy a sequence. 10 total. B8 X Last Player Wins Move lit LED (press a key) toward Al, then toward 8128 any X number of "jumps ". Alternate play. Last player able to move wins. Score is accumulative game to game. B16 Special Effects Press any key or key combinations to generate steady tones. B32 " "A" key control pitch range, "B" keys control speed range of randomly appearing LED's and tones. B64 " " Sixteen different sound effects, one per key. B128 " " Sixteen different sound and LED patterns, one per key. NOTE 1: Press RESET, then any key (left side of chart) to start a game. NOTE 2: After a game terminates, pressing the key (other than RESET) will restart same game.

PARTS LIST All resistors are '/4-watt, 5%. IC4- 74HCT574 octal D -type Miscellaneous: PC board, 9 volt R1, R2- 10,000 ohms CMOS flip -flop battery connectors (1 each, Key- R3, R4-30 ohms IC5- LM2931Z -5.0 low- dropout 5- stone No. 593 and No. 594), six R5-100,000 ohms volt regulator stick -on rubber feet, two 20 -pin IC R6-4700 ohms D1 D16 -1N914 diode sockets, one 28 -pin socket, and Capacitors LED1 LED16 green light- emitting one 40-pin socket C1 -100 1.F, 16 volts, radial elec- diode Note: The following items are trolytic 01, Q2- 2N3906, PNP transistor available from Silicon Sound, C2 -10 µF, 25 volts, radial elec- Other components PO Box 1694, Reseda, CA trolytic Sl S17 -PC -mount pushbutton 91337-1694 (818) 996 -5073: C3, 04 -30 pF, 25 volts, ceramic switch Double- sided, silk screened disc, 20% S18 -SPST PC -mount slide switch PC board -$35.00 C5- C7-0.1 µF, 50 volts, ceramic, J1 -DC power jack, PC mount, Programmed 27C256 axial, 20% 2.0mm pin EPROM -$15.00 C8-0.1 µF, 50 volts, ceramic, radi- J2 -2 -pin molex header, 0.1 -inch Complete C -Game kit includ- al, 20% spacing ing all parts -$79.00 Semiconductors XTAL1 -4 -MHz crystal, HC -18 met- Assembled and tested C- IC1- 27C256 CMOS EPROM al case Game- $99.00 IC2- 74HCT573 octal D -type B1 -9 -volt alkaline battery Please add $3.50 for shipping CMOS latch BZ1 -piezo -alarm (múrata -erie No. and handling. California resi- IC3 -80C31 CMOS microcontroller PKM22EPP -40) dents add 8.25% sales tax.

The circuit draws an average age of 8 to 10 hours and a nickel - rent requirements. Supplying of 20 to 30 milliamperes, with a cadmium battery will last from power through jack J1 elimi- maximum drain of 65 milliam- 5 to 8 hours. Avoid 9 -volt carbon nates the need for a battery. peres with all LEDs on. A 9 -volt batteries; even a fresh one can't This is recommended if the alkaline battery will last an aver- deliver the C- Game's peak cur- game is played often. 65

www.americanradiohistory.com and jack, transducer, crystal, ( START and audio output jack. Next install six rubber feet on the bottom of the printed circuit ACTIVATE CONTROL LINES LINE 8 board. These will keep the cut FOR LEDS AND KEYS } SET POINTER FOR WRITING LEDS LINE 9 leads of the components from damaging your table top while you play the game. Optionally, you might want to mount a READ 'A' KEYS LINE 10 sheet of INVERT KEY VALUES LINE 11 plastic to the PC board's WRITE KEY VALUE TO LED BANK LINE 12 bottom side to keep the leads from scratching your fingers. Cut it to the same size as the PC board and fasten it with machine screws and spacers. One- sixteenth inch thick styrene or LINE 13 black ABS plastic works well. NO Finish up by installing the four ICs. The completed game is shown in the opening of this article.

'CLICK' THE P EZO SPEAKER LINE 14 Checkout MOVE KEY VALUE TO'DL1' LINE 15 Connect a 9 -volt battery and SET'DL2' TO 4 (DELAY) LINE 16 turn on the power switch. You should first hear a short beep, then see the 16 LEDs light one at a time in a repeating counterclockwise pattern. If nothing happens when power is applied, check to see that + 5 volts is LINE 17 present at the output of IC5. Also check for + 5 volts on each IC's power pin, and make sure each ground pin is at zero volts. Verify that none of the address or data lines are shorted to each other. Check to see that each of the 16 pushbuttons work. To do LINE 18 LINE 19 this, you need to press the reset switch before pressing each pushbutton. At this point, don't try to play each game; just see that every pushbutton FIG. 3 -THIS FLOWCHART details the operations performed in Listing 1. causes a distinct change in the game's behavior. (Note that you will hear a similar start-tone se- Construction sistors, and capacitors. Next, quence after each game is se- All of the necessary compo- install the sixteen LEDs flush lected, so wait long enough for a nents including the PC board with the PC board. Follow with few LEDs to turn on.) are available from the source the IC sockets, but do not install given in the Parts List. Foil pat- the ICs into their sockets until The games terns are provided if you want to all other parts are installed. Table 1 shows a complete list make your rn own PC board. Pre- lb install the two battery con- of the 16 game functions. Notice programmed EPROMs are avail - nectors, align them by first the designations Al, A2, A4, able from the source given in snapping them onto a 9 -volt etc., on the left side of the chart, 3 the Parts List, and the hex code battery. Be sure the battery po- which correspond to the key is posted on the Electronics larity is correct. While holding designations shown in Fig. 2. Now BBS (516 -293.2283, V.32. the battery flush with the PC As an example of how a par- ó V.42bis) as a file called board, solder the battery con- ticular game is selected, if after CGAME.HEX. nectors in place. Remove the pressing reset you press the "4" Using Fig. 2 as a guide, solder battery after the clips are in key on the "A" side, you will start the components in place begin - place. Next, solder in the 16 the tennis game. 66 ning with the 1N914 diodes, re- pushbuttons, the power switch Continued on page 70

www.americanradiohistory.com TAKE :ACK CONTROL OF YOUR TELEPHONE

Upgrade the February CALLER I D 1994 Caller -ID project so it works with the calling - REVIEW REVIEW name delivery service. CLEAR BCK FWD

TERRY WEEDER

AN ARTICLE IN THE FEBRUARY 1994 mat (MDMF). SDMF, described issue of Electronics Now ( "Take in the February article, works initial code of 04 (hex- SINGLE DATA Back Control of Your Tele- when an MESSAGE FORMAT phone") described the opera- adecimal) is sent to your tele- the data MESSAGE TYPE tion and construction of a phone to identify = 04 HEX calling number identifier or stream that follows as SDMF CODE CDI. That circuit decodes the format. MESSAGE LENGTH Caller ID data on the telephone line and displays the calling par- Single -data format MONTH ty's number. The subscriber fea- Figure 1 shows the order in ture that made this service which the data is sent with DAY possible is known calling SDMF. The "message type" and HOUR number delivery or CND. The "message length" are sent in service is probably available binary code, while each MINUTE from your local telephone com- character of the month, day. pany for a small monthly fee. hour, minute, and telephone DIGIT 1 "P" "O" This article describes an up- number are sent in standard 8- DIGIT 2 grade to that circuit which pro- bit ASCII code. If the calling par- vides an additional service ty's number is not available be- termed calling name delivery or cause it is outside your service CNAM. Be sure to reread the area or originates from a phone February article if you want to where CND is not supported. of a refresh your recollection of the the letter "O" is sent instead UP TO 10 DIGITS details of that project before you telephone number. If the calling add this upgrade. party deliberately blocks the de- The telephone companies use livery of his number (done in FIG. 1 -A TYPE CODE OF 04 (hex) will two different formats to send most areas by pressing 67 pri- precede the data in the single data mes- Caller ID to your home: single or to making the call), the letter sage format (SDMF). This is the order in data message format (SDMF) "P" will be sent instead of the which each word will be sent in the and multiple data message for- telephone number. SDMF format. 67

www.americanradiohistory.com SINGLE DATA MESSAGE MULTIPLE DATA MESSAGE MDMF that indicates transmis- FRAME FORMAT FRAME FORMAT sion of CND and/or CNAM is 80 CHANNEL SEIZURE CHANNEL SEIZURE (hex). That's followed by a mes- SIGNAL SIGNAL sage- length word which is the 300 BITS OF 300 BITS OF sum of all the words in all the ALTERNATING ALTERNATING '0's AND '1's '0's AND '1's different parameters associated (01010101010101) (01010101010101) with the message. Figure 3 shows each parameter that can 180 MARK BITS 180 MARK BITS (11111111111111) (11111111111111) be included in the message, and the "type" codes that are used to MESSAGE TYPE MESSAGE TYPE identify each of the multiple pa- MARK BITS (0-10) MARK BITS (0-10) rameters. MESSAGE LENGTH MESSAGE LENGTH Notice that each parameter MARK BITS (0-10) MARK BITS (0-10) also has its own "length" word. The length word is 1ST MESSAGE WORD PARAMETER TYPE important MARK BITS (0-10) MARK BITS (0-10) when designing a program that 2ND MESSAGE WORD will decode the message. For ex- MARK BITS (0-10) PARAMETER LENGTH ample, if you want the program MARK BITS (0-10) to look only for the name of the 1ST PARAM WORD calling party, you would want it MARK BITS (0-10) w to ignore all other parameters c.7 2ND PARAM WORD LAST MESSAGE WORD MARK BITS (0-10) that have the wrong type code. MARK BITS (0-10) w When receiving each type code, 2 the length word indicates how CHECKSUM many words the program will LAST PARAM WORD have to skip before the start of MARK BITS (0-10) the next parameter in the message. MORE PARAMETERS The parameters that will be included in the message depend on whether you subscribe to CND, CNAM, or both. In all cases, either the "Number" parameter or "Reason for Absence of Number" parameter will be MORE MESSAGES

DATA AND TIME NUMBER PARAMETER PARAMETER

PARAMETER TYPE PAHAME FER TYPE CODE = 01 HEX CODE = 02 HEX

PARAMETER LENGTH PARAMETER LENGTH

MONTH DIGIT 1 CHECKSUM DIGIT 2 DAY

FIG. 2 -DATA ARRANGEMENT IN THE SDMF frame as compared to the arrangement HOUR in the MDMF frame. MINUTE UP TO 10 DIGITS

Multiple -data format rameters. For example, with NAME REASON FOR ABSENSE MDMF was invented to allow CND, the information, date, PARAMETER OF NAME PARAMETER TYPE PARAMETER TYPE additions to be made to the data and time are sent in a single CODE = 07 HEX CODE = 08 HEX stream, including multiple segment, or parameter, and the PARAMETER I II blocks of data (messages) not calling number is sent in a sec- PARAMETER LENGTH LENG necessarily related to each ond segment. CHARACTER 1 '0' OR 'P' other. Bellcore (the Bell Com- Each message can contain CHARACTER 2 munications Research Group) different kinds of segments in REASON FOR ABSENCE has suggested that SDMF might random order, depending on OF NUMBER UP TO15 PARAMETER TYPE eventually be phased out in the service the customer has or- CHARACTERS CODE = 04 HEX favor of MDMF. dered. The last word to be sent PARAMETER LENGTH Figure 2 shows how the struc- is a checksum. Used for error 0' OR '1,1* tures of the two different for- detection, the checksum is the mats coexist compatibly. The two's complement of the sum of FIG. 3- MULTIPLE PARAMETERS are data associated with each the bits in all words in the data contained in the MDMF frame. Here's a MDMF message is divided into transmission. list of those parameters with their identi- 68 separate segments called pa- The message -type word in the fying type codes.

www.americanradiohistory.com START TIME INITIALIZE PORTS SUBROUTINE

GET AND DISCARD DATE

GET TIME AND LOAD INTO MEM 1 CHANGE TIME TO INIT. DISPLAY 12HR AM/PM FORMAT PRINT LOGO

¡ RETURN { ¡ GET 8 BITT WORD FROM IC2 SHIFT DISPLAY FORWARD

YES SHIFT DISPLAY BACKSWARDS l GET MESSAGE LENGTH

CAL.. TIME

CALL NUMBER

I GET MESSAGE LENGTH

GET NUMBER AND LOAD INTO MEM GET PARAMETER TYPE

YES

BRING IC2 OUT OF STANDBY

DISCARD ALL WORDS IN PARAMETER

PUT IC2 IN STANDBY

SLEEP UNTI'. OUTPUT MEM ATCHUOG 'IYEOJT TO DISPLAY

FIG. 4- FLOWCHART FOR THE UPGRADED VERSION of firmware for the PIC16C55 in the February 1994 Caller -ID project. This version is compatible with both SDMF and MDMF. The originally programmed microcontroller will not work sent, but not both. The same Project upgrade with this system. If you have a applies to the "Name" param- The original firmware written PIC16C55 programmed with eter and "Reason for Absence of for the PIC16C55 micro - the original version of the firm- m Name" parameter. controller in the Caller ID proj- ware, you can send it to the au- a At the present time, the max- ect was configured to work with thor at: PO Box 421. Batavia, a imum number of characters in SDMF only. If you live in a call- OH 45103. He will exchange it Ñ the name parameter do not ex- ing area that supports MDMF for a PIC programmed to accept ceed 15. That number is ex- and not SDMF (this can be de- MDMF at no charge. You can 2 pected to increase some time in termined by calling your tele- also send him a 31/2- or 51/4-inch the future. phone company). Continued on page 88 69

www.americanradiohistory.com COMPUTERIZED GAME LISTING 1

continued from page 66 3. ;EXAMPLE SOFTWARE LISTING FOR 80C31 C -GAME 2 3 0030 DL1 EQU 30H ;VARIABLE, INNER DELAY The second column from the 4 0031 DL2 EQU 31H ;VARIABLE, OUTER LOOP 5 left in Table 1 shows the games 6 0000 ORG 0000H ;SET ORIGIN OF PROGRAM that require two players. Typical 7 8 0000 7590CA START play is with both players sitting MOV P3,#OCAH ;ENABLE "A" KEY & LED BANKS opposite each 9 0003 900000 MOV DPTR,#0 ;SET ADDRESS FOR LEDS other, each with 10 0006 E590 START2 MOV A,P1 ;READ PUSHBUTTON KEYS both hands on the keys. Games 11 0008 F4 CPL A ;MAKE LOWS TO HIGHS checked in the third column 12 0009 FO MOVX @DPTR,A ;WRITE TO LED'S 13 000A 60FA JZ START2 ;GO BACK IF NO KEYS DOWN can be played by 14 000C B284 one player, or CPL P3.4 ;,TOGGLE PIEZO (ONE "CLICK ") alternately by two or more. 15 000E F530 MOV DL1,A ;MOVE A TO DL1 VARIABLE 16 0010 753104 DELAY MOV Game DL2,#04 ;SET INNER LOOP TO 4 titles are shown in the 17 0013 D531FD DELAY2 DJNZ DL2,DELAY2 ;INNER LOOP fourth column, and how-to -play 18 0016 D530F7 DJNZ DL1,DELAY ;OUTER LOOP (KEY VALUE) 19 0019 80ES JMP START2 ;START OVER instructions are shown in the 20 0019 middle of the chart. END Be aware that the numbers in Errors: None the key designation (1, 2, 4, 8, 16, 32, 64, 128) also correspond to the bit values of an 8 -bit bin- a key next to a lit LED to move it Going further ary number. It is important to to an "empty" (non -lit) space. For readers who want to pro- know this when playing games Either player can move any LED gram their own custom applica- A32, A64, and A128. Also, after (in his turn), as long as it is in tions or games, a short assem- many games terminate, the the direction of LED Al, and bly software listing is given in score will be displayed in binary then finally in the direction of Listing 1. This program contin- on both sides of the board. For LED B128. The game won't let uously reads the A -side keys example, if after a game ends, you make illegal moves. Once and correspondingly lights the LEDs A8 and A4 are lit, the there are no more unlit spaces A -side LEDs while producing a score is 12 for the A side. toward B128, the game is over. tone from the transducer. The Four of the single -player The last player to fill an empty frequency of the square wave is games (A32, A64, A128, and B2) space wins. directly dependent on the bin- require that you "enter" an an- A few games are quite simple. ary value of the keys that are swer. During those games, They require only that a key be pressed. pushbutton A128 acts as an en- pressed when that side's corre- The flow chart, Fig. 3, details ter key. First hold down a com- sponding LED lights. Games the operations performed in bination of A keys for your Al, A4, and A8 are three such Listing 1. The line numbers in answer, then enter that answer games. When you are learning the flow chart correspond to the by pressing key A128. the C -Game, it is suggested you line numbers in the assembly In two games, A32 and A64, start with the games in the listing. two numbers will be shown in order shown in Table 1 (first Al, Notice line 16 in the listing. binary. The first number will be then A2, A3, etc.) as they are The square wave's frequency is displayed with a corresponding organized by order of difficulty. determined by the value placed "low" beep, followed by the sec- The four "special effects" se- in the "inner loop" (refer to the ond with a corresponding lections are included just for flowchart and also lines 16 and "higher" beep, then a pause. fun. When selected, C -Game 17). By changing the value from The numbers keep repeating. produces random and pre -pro- 4 to some larger value, for exam- Those are the two numbers you grammed LED displays and ple, the loop would require more need to work on in those games. sound effects. In selection B16, time to decrement to zero, caus- The object of game A32 (Binary the A -side keys and B -side keys ing the overall range of frequen- Math), for example, is to cor- each produce a separate tone; cies of the square waves to be rectly add, subtract, divide, and the frequencies are dependent lower. it multiply (in any order) the two on the keys held down. Selec- 4 -bit numbers shown. Each tion B32 lights LEDs in a ran- time you enter a correct answer dom pattern, with the A -side (enter with key A128), two B keys controlling the range of the BE side LEDs light up. After all tones, and the B -side keys con- A GOOD eight B -side LEDs are lit, you trolling the overall cycling z win and the game ends. speed. 13 In c game B8 (Last Player Refer back to Table 1 for more 0 Wins), the game will prompt the details about operating all of the NEIGHBOR player whose turn it is by mo- games and functions. Don't be Volunteer. w mentarily flashing all eight afraid to experiment and press LEDs on that side. You then the keys in any order you wish - American Heart Association 70 must move an LED by pressing you can't harm anything.

www.americanradiohistory.com HARDWARE HACHE Second law violations, soliton wave rectifiers, a fine new CD -ROM directory, a Santa Claus machine update, and some unusual hacker

opportunities. DON LANCASTER

sci- hot research topic. One application Ijust got a call from a graduate can be presented to a credible student who is certain that sec- entific journal for a peer review and is in fiber -optic communications, go much further ond law of thermodynamics has publication. where a soliton can repeating amplifiers. In been proven wrong and he wanted By going the pseudoscience between fiber communication to know what should be done about route, he can go to anyone in the fact, soliton demonstrated over dis- it. He said something about statis- pseudoscience industry press and has been tical thermal gradients nailing get his paper instantly published. Or tances a third of the way around the a 20- gigabyte data rate. Maxwell's Demon in a driveby else he could pick slow news days in earth with There shooting. Naturally, the effect is obscure rural newspapers for his Why will any wave die out? main reasons. First, the purely theoretical. It is "too small to coverage. Or he could go to even are three when it does measure in the lab." more obscure semi -scholarly for- wave will dissipate flex a resisting cable The second law says heat always eign publications of questionable such things as air resistance. Dis- tends to flow from a hot to a cooler pedigree. But none of these alter- or encounters transforms all of body, but it does not say that it is nate routes will look good on his sipation ultimately low -grade impossible for heat to flow from a resume. the wave energy into heat. cool to a hot body. I've just posted lots more infor- wave will Actually, our helpline hears about mation on exploring pseudoscience Second, portions of the encounter three secd -law violations or so resources as NUTS26.PS on GEnie reflect whenever they imped- per month. So let's go over the rules PSRT. Back to the real world... any changes in the media's In the case of one more time True, the second law ance or uniformity. Juan cable, the end ring is of thermodynamics ( "you cannot Solitons that San break even ") has never been Outside of a classic ghost town in something less than a perfect short proven. Moreover, it probably is not Colorado's San Juan Mountains, circuit, so you don't get everything provable. there is an old free -hanging mining reflected back. important for a On the other hand, and without cable. This beast is nearly a mile Finally, and most if the exception, every attempt to find any long and over an inch in diameter. It soliton, the wave will disperse counterexample that would prove it leads us to some utterly fascinating media lets higher frequency waves wrong has utterly and totally real -world and real -time physics. If go by faster or slower than lower the wave failed -at least on the normal every- you grab this cable near the low end frequency ones. Usually, over time. day scale of things. Literally billions and shake it once, you can watch a energy "stretches out" be repre- of tests are unintentionally rerun day solitary wave running up, reflecting, Any waveform can as a group of high- frequency in and day out that overwhelmingly and returning several seconds later. sented If suggest that the law really is true. What is really amazing is that the and low- frequency components. step, the wave Congress is not expected to repeal solitary return wave is so violent that these ever get out of will the second law of thermodynamics it will try to rip your arm right off the shape will change drastically, as any time soon. cable. Something unusual appears its detectability. for type of If the grad student is convinced to be happening. A different name one he is right, he has two options: He A century ago, a mathematician dispersion is group delay distortion. frequency for a can go the real science or the decided that certain solitary waves For instance, if the more delay pseudoscience route. By going the can indeed be special. He was riding one in a modem has frequency for a zero, there real science route, he has to create his horse along a canal bank and than the might be a time when you get a one, a simple and easily duplicated ex- was daydreaming about waves. A neither at the out- periment that proves the effect con- barge suddenly stopped and then a zero, both, or clusively to disinterested third launched a solitary wave. He imme- put. Obviously, "both" and "nei- are bad news when it comes parties. It must be done so that his diately noticed that this wave was ther" information. explanation for what is happening unique in that it kept going much to extracting useful 1 the essentials of seems to be the most probable and farther than ordinary waves. In fact, Figure shows pulse that is the most reasonable. he followed the wave for miles. After solitons. An ordinary media The results must stand up. After some analysis, he called this special sent through a dissipative harder to detect. A the results are independently dupli- type of wave a soliton. gets worse and is through the 71 cated and verified, then his paper Today, solitons are an incredibly soliton that sent

www.americanradiohistory.com same media actually gets betterand easier to detect. For the best results, the media has to be known, stable, and fixed in length. The soli - ton shape also has to be designed to match the media. DISPERSIVE MEDIA A soliton wave tries to predistort itself so that, by the time it is sent through the media to the intended receiver, the dispersion of the media (A) Ordinary pulse gets and the "undispersion" of the initial "worse" as it goes through a dispersive media. waveform cancel out. The fast and later frequency components catch up with slow and early ones. The soliton wave in effect becomes self - A reinforcing. Bats and military radars depend DISPERSIVE on a more elaborate chirp scheme 4 MEDIA that works in more or less the same f way as solitons. Send any swept FM signal through any media that has a linear delay versus frequency (B) Soliton pulse gets "better" as it goes through a dispersive media. response, and you get a narrow and high -amplitude pulse out -Fourier transforms and all. FIG. 1-SOLITONS are a special class of solitary waveforms that can travel much When you explore the literature, farther than ordinary waves. They are now a very hot research topic. you will find 8,316 soliton papers on the Dialog information service less random and rather short sam- be generated through water pres- alone! There are also dozens of text- pling of information sources in Fig. sure only, using some sort of bolt -on books available. Sadly, many are to- 2. These sources and their end bibli- and pass- through flutterwumping tally unreadable and involve horren- ographies should be enough to get adapter that is in series with the dous math. I have posted a more or you started. water supply. Let me know if you find any favor- But go ahead and use electronics ite soliton tutorials on your own that or even high -pressure NEW FROM air to prove DON LANCASTER are easy to understand. An the idea works. Because of an excit- Incredible Secret Money Machine Il ing and an incredibly effective new HARDWARE HACKING book will be sent for your trouble. foam firefighting technique, certain incredible Secret Money Machine II 18.50 What good are solitons for hard- new pumpers now include a reliable Hardware Hacker Reprints II or Ill 24.50 Blatant Opportunist Reprints 24.50 ware hackers? Well, obviously, they compressed air supply. Resource Bin Reprints 24.50 are a great subject for science fair Let me know what you can come The Case Against Patents 28.50 Ask The Guru Reprints I, II or III 24.50 projects, student papers, or even up with here. Obviously, you can CMOS Cookbook 24.50 thesis topics. But there's a possible use an TTL Cookbook 24.50 ordinary garden hose for all Active Filter Cookbook 24.50 new use for solitons that just about your initial tests. This subject ap- Micro Cookbook I 19.50 anybody can explore, Lancaster Classics Library 119.50 and for which pears to be an outstanding new hands -on backyard testing is more hacker opportunity. POSTSCRIPT STUFF important than fancy math. It is PostScript Secrets (Ile/Mac/PC) 39.50 one Book-on-demand resource kit 39.50 use that is guaranteed to get your Santa Claus machines Intro to PostScript VHS Video 39.50 feet wet, and PostScript Beginner Stuff 39.50 that might make you The science fiction authors called PostScript Show & Tell 39.50 some big bucks. them Santa Claus machines. These PostScript Cookbook (Adobe) 19.50 PostScript Ref. Manual II (Adobe) 31.50 Simply answer this question: magic boxes could run off a copy of PostScript Program Design (Adobe) -24.50 "Can solitons improve fire anything -a BMW, a pastrami on Type I Font Format (Adobe) 15.50 Acrobat Reference (Adobe) 24.50 streams ?" rye, a new girlfriend, or a duplicate LaserWriter Reference (Apple) 19.50 Between spelunking, $20 bill. It would start with PostScript by Example (McGilton) 29.50 tinaja either a Pgm Display PostScript with X 29.50 quests, and pecan harvests, I am sample or a set of software plans. PostScript Visual Approach (Smith) 22.50 also a city fireman. The gun Thinking in PostScript (Reid) 22.50 deck on These days, crude approxima- Undat PS Pgrmmg (Holtzgang) 29.50 a pumper has an effective fire - tions of the Santa Claus machine The Whole Works (all PostScript) 349.50 ground range of slightly over 200 really do exist, and they are getting FREE VOICE HELPLINE VISA/MC feet. There are times and places better every day. Today, these are SYNERGETICS when that range just isn't enough. often known as desktop manufac- Box 809 -RE The solitons should be able to ex- turing or else rapid prototyping sys- Thatcher. AZ 85552 tend this range (602) 428 -4073 significantly. tems. The pastrami on rye sandwich 72 Ideally, all of the solitons should still leaves a distinctly acrylic after- CIRCLE 205 ON FREE INFORMATION CARD

www.americanradiohistory.com All- optical Waveguide Switching, Stegeman, G.I.& Wright, E.M. Optical and Quantum Electronics V22, no.2, p95 -122 March 1990 (62 refs). Darboux Transformations & Solitons, Matveev, V.B.; Salle, M.A., Springer Series in Nonlinear Dynamics, Springer -Verlag Press, 1991. ELEA Dispersion and Nonlinear Effects in Optical Fibres, Ghatak, A. & Kumar, A., Int. Jnl. of Optoelectronics, V8, no.4, p299 -318 July -Aug 1993 (44 refs). COMPONENTS Dynamical Chaos of Solitons, Spatschek, K.H., World Scientific, 1993. Whether you order 1 part or Optical Solitons in Fibers, Hasegawa, A., Springer -Verlag, 1990. all 45,296...MOUSER stocks I. F., Research Reports in Physics, Solitons and Chaos, Antoniou, & Lambert and...ships same day!! V16, Springer Verlag Press, 1991 Soliton -based Communication, Hasegawa, A., Journal of the Institute of CALL... (800) 992 -9943 Television Engineers of Japan, V47, no.8, 1088 -96 Aug 1993 (23 refs). Soliton Equations and Hamiltonian Systems, Dickey, L.A., World Scientific Publications, 1991. for your Solitons In Molecular Systems, Daavydov, A.S., Mathematics & Its Applications, d®,. FREE Soviet Series Kluwer Ac, 1990. c CATALOG Solitons in Multidimensions, Konopelchenko, Boris G., World Scientific y Publications, 1993. :.,2401 Hwy 287 N. Solitons, Nonlinear Evolution Equations & Inverse Scattering, Ablowitz, M.A & Mansfield, TX 76063 Clarkson, P.A. London Mathematical Society Lecture Note Series, #149 Cambridge University Press, 1992. Soliton Phenomenology, Makhankov, Valdmir, G, Mathematics & its Applications, Soviet Series, Kluwer Ac, 1990, MOUSER Soliton Theory: A Survey of Results. Fordy, A. P. Non -linear Science Series, ELECTRONICS Wiley, 1992. Sales & Stocking Locations Nationwide

CIRCLE 117 ON FREE INFORMATION CARD FIG. 2 -SOME RECENT SOLITON REFERENCES. There are over 8000 more! taste, but it definitely is low in fat sure is then applied. The toner and has zero cholesterol. transfers to the board and becomes Be FCC There are now a dozen ap- the etch resist or the image. an proaches to Santa Claus machines, The two leading suppliers of di- materials are DynaArt so I thought I would once again rect -toner LICENSED gather the names of several of the Designs and Techniks, with the ELECTRONIC TECHNICIAN! bigger players together into this printed circuit supplies sold by month's resource sidebar. Most of Kepro. the systems we'll look at are out- CAD /CAM. This method has rageously expensive-a house and been around for a while. It works like Earn up to hour is no reason why an ordinary lathe or milling machine, $30 an two cars. But there and more! the whole kit and kaboodle of them machining materials to leave the de- a can't be replaced with $175 worth sired object. The difference is soft- Learn at home in spare time. of hacker parts, bunches of time, ware control. The machine is fed a No previous experience needed! and a lot of imagination. Some of set of plans in software form and it No costly school. No commuting to class. The Original Home -Study course prepares the major approaches to Santa does the rest by itself. Low -end ma- you for the "FCC Commercial Radio- Claus machines are shown in Figs. 3 chines have only started to appear telephone License." This valuable license is professional here. Although much lower in cost your "ticket" to thousands of and 4. Here's a brief rundown: exciting jobs in Communications, Radio - Direct toner method. This one than old "industrial strength" ma- TV, Microwave, Maritime, Radar, Avionics chinery, they still remain obscenely and more...even start your own business! is the cheapest, the most accessi- You don't need a college degree to qualify, ble, and the most hacker friendly. overpriced for most hacker uses. but you do need an FCC License. But it is pretty much restricted to Typical low -end CAD /CAM sup- No Need to Quit Your Job or Go To School pliers include Roland, Techno Isel, This proven course is easy. fast and low two -dimensional work such as mak- cost! GUARANTEED PASS You get your ing instant printed circuits, front and Light Machines. Other vendors FCC License or money refunded. Send for facts now. MAIL COUPON TODAY! panels, or dialplates. advertise in such places as the FREE With this method, you laser print School Shop and Industrial Educa- commanD PRODUCTIO 1S the toner image onto a transfer tion trade journals. FCC LICENSE TRAINING, Dept. 90 P.O. Box 2824, San Francisco, CA 94126 sheet. The transfer sheet is placed Custom CAD /CAM bits and Please rush FREE details immediately! in contact with your printed circuit pieces are available at Stock Drive NAME _ board or whatever. Heat and pres- Products. Two other material ADDRESS 73 CITY STATE ZIP

www.americanradiohistory.com sources are MSC Specialties and NAMES AND NUMBERS and a second layer is imaged, build- McMaster-Carr. John Rees offers a Aero/Skyways ing up the desired prototype. hacker version here that lets you 15 Crescent Road The final objects are often sturdy use ordinary car alternators as Poughkeepsie, NY 12601 enough for use as actual production power stepper motors. (914) 473 -3679 parts. Unlike stereolithography, the A CAD /CAM prototyping sys- Buddy Products materials used are low -cost and tem can be used with a machineable 117 -A Commercial Drive non -hazardous. The laser is also wax instead of metal or plastic. The Thomasville, GA 31792 cheaper because it emits infrared wax can then become a pattern or a (912) 225-9758 rather than ultraviolet light. DTM mold for your final product. This is Burman Industries Corp in Austin seems to be the easier on tools, and mistakes can 1441 Covello Street, Ste 6A champion of selective laser sinter- be recycled. Wax is also a good Van Nuys, CA 91405 ing. material for practice. One source of (818) 782 -9833 Cubital Toner Imaging. This machinable wax is Freeman Supply, method is related to the direct Dialog -toner while Kindt- Collins provides a wide method. An unfused toner laser im- range of industrial and artist waxes. 3460 Hillview Avenue Palo Alto, age is contact -printed onto a pho- Laser Blasting. The medium CA 94304 (415) 858 -2700 topolymer. After the uncovered power laser is one variation on photopolymer is hardened by ex- First Light Video CAD /CAM that is revolutionizing Publishing posure to ultraviolet light, the unhar- 8536 Venice Blvd crafts, model making, and smaller dened photopolymer is sucked up Los Angeles, CA 90034 part manufacturing. Parts are cut and (800) 777 -1576 recycled, as is the toner image. quickly, accurately, and splinter free. Voids are then replaced with a wax A 20 -watt carbon -dioxide laser Fluorescent Mineral Society filling. could be used for such tasks as the PO Box 2694 The surface is carefully milled flat precision Sepulveda, CA 91343 cutting of doll -house fur- and another layer is created. Unlike (818) 786-4885 niture or slicing up parts for model stereolithography, an entire layer railroad structures. More informa- GEnie rather than a single spot is formed tion on power laser systems ap- 401 N Washington St at one time. Cubital toner imaging pears in Industrial Laser Review, Rockville, MD 20850 also requires far less photopolymer, (800) 638 -9636 while two hacker -friendly sources since only a thin layer is used. First for lasers are Meredith and MWK. The Calculator Collector developed in Israel, one source is Water Knives. Here an ultra high Intl Assn Calculator Collectors Cubital America and one service pressure water stream does all the 10445 Victoria Avenue bureau is Stature Machining Tech- cutting. My favorite demonstration Riverside, CA 92503 nologies. is one of these chopping up a gooey Morph's Digital Outpost Sticky Strings This approach piece of chocolate cake and a four- PO Box 578 seems well suited for forming such inch thick steel slab at the same Orinda, CA 94563 hollow objects as shampoo bottles time. Flow International is one (510) 238-4545 or similar packaging containers. The source of equipment. Haskell Polytek correct name for the process is makes the special pumps. Development PO Box 384 fused deposition modeling, and The Stereolithography. pioneer Lebanon, NJ 08833 Stratasys is its main source. here is a company called 3D Sys- (908) 534 -5990 In use, a large reel of ther- tems. With stereolithography, a vat moplastic rod is unwound along a of a liquid photopolymer is hard- Save the Planet Software Box 45 path. The rod is deposited at a tem- ened one layer at a time by a scan- Pitkin, CO 81241 perature just hot enough so that the ning laser. The laser is lowered (303) 641-5035 outside is liquid, causing it to stick slightly as each new layer is finished to the previous layer of the pattern. Sony Semiconductor so that the next layer can be hard- The results look sort of like cor- 10833 Valley View Street ened. The process is repeated until duroy, but you Cypress, could trade off wire the part is completed. Virtually any CA 90630 (800) 288 -SONY diameter against smoothness. A shape can be made, including ones final polish or filler or solvent spray that are difficult to machine. Telecom Library can improve the surface finish. The 12 West 21st Street photopolymers aren't all that It appears to me that a hacker New York, NY 10010 different from the ones used in flex - might easily fake this with a hot (800) LIBRARY glue ographic printing and rubber gun by substituting polyethylene for stamps. Two suppliers are the glue sticks. One obvious use is Merigraph and Grantham Polly - The laser selectively melts and custom cast house number or name Stamp. bonds portions together in a thin plates. Selective Laser Sintering. layer by sintering. (Sintering is melt- Laminated Paper Shims. This This is a rapid prototyping method ing things just enough so that they method works just like the contour that starts with a fine powder of stick together.) Then the part is lines on a topographical map. It is 74 wax, plastic, or even certain metals. lowered, more powder is leveled, also known as laminated object

www.americanradiohistory.com ATTENTI i N.

DIRECT TONER METHOD uses heat and pressure to transfer toner to a flat substrate ELECTROÑs toner for pc board etching or dialplate artwork. CA printed circuit board çHNa n .7 EARN YOUR \

end mill CAD /CAM METHOD uses a programmable B.S.E.E. lathe or milling machine to remove scrap from around the prototype object. DEGREE stock being machined THROUGH HOME STUDY Our New and Highly Effective Advanced- Place- ment Program for experienced Electronic Tech- nicians grants credit for previous Schooling and Professional Experience, and can greatly re- LASER BLASTING METHOD uses a medium duce the time required to complete Program and ir laser beam re- to high power laser to physically cut out the reach graduation. No residence schooling quired for qualified Electronic Technicians. parts to their desired shapes. Through this Special Program you can pull all of material being cut the loose ends of your electronics background together and earn your B.S.E.E. Degree. Up- grade your status and pay to the Engineering Level. Advance Rapidly! Many finish in 12 months or less. Students and graduates in all 50 States and throughout the World. Established WATER KNIFE METHOD uses an ultra high Over 40 Years! Write for free Descriptive Lit- water stream erature. pressure water stream to cleanly and quickly slice materials such as food or fabrics. material being cut COOK'S INSTITUTE OF ELECTRONICS ENGINEERING

E 4251 CYPRESS DRIVE CZ E JACKSON. MISSISSIPPI 39212

uv laser beam STEREOLITHOGRAPHY METHOD uses an CIRCLE 58 ON FREE INFORMATION CARD ultra violet laser to selectively harden certain areas out of a liquid photopolymer. liquid photopolymer TRY THE NEW

yir laser beam LASER SINTERING METHOD will use an &tiviiics infrared laser to selectively bond certain wax, NOW, plastic, or metal granules.

granular wax BBS

FIG. 3 -SOME CURRENT APPROACHES to Santa Claus machines. 516 -293 -2283 manufacturing. At the present method. A thin layer of ceramic chosen elevation, a piece of adhe- powder is put down, and a scanning sive- coated paper of the desired head with one or more inkjets pass- COMMUNICATE WITH thickness is cut out with a laser. es over the powder, selectively ap- The latest piece is then carefully plying a binder. OTHER READERS OF aligned to the previous sheet and is The part is lowered and the pro- then heat -set. This process repeats cess is repeated, causing layer ELECTRONICS NOW often enough to build up the desired upon layer of binder to build up in part. A final surface coating can the desired shape. The final shell eliminate the individual steps. can be directly used for the high - DOWNLOAD ARTICLE - Materials costs are exceptionally temperature casting of chrome al- FILES low, and only a low-power laser is loys, aluminum, and even nickel. RELATED needed. This method is particularly Hollow items can be made by build- AND SOFTWARE good for sand casting. One supplier ing up integral cores. of these systems is Helisys. Wax Vacuuming This is a new Ceramic Shell Casting. Origi- hacker concept that just might revo- nally developed at MIT, Soligen is lutionize jewelry and small art object V.32/V.42bis now the leading proponent of this creation. Picture a hypodermic -like 516-293-2283 75

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uy flashtube continued from page 20 toner mask CUBITAL TONER METHOD transfers toner thin liquid photopolymer images a layer at a time to a wax supported decimal point is determined by the and flat milled liquid photopolymer. selected range. The LED display will flash when an overrange condition wax supported solid photopolymer is encountered. If an illegal combination of front -panel switches is (for example, if DC volts guiding nozzle selected STICKY STRING METHOD uses a heated and the 20- megohm range are se- roll of plastic rod to bond to previous layers lected at the same time), all of the for bottles and hollow objects. decimal points will light. form being assembled The unit is said to be maintain its accuracy for at least a year. After it be calibrated. next laser cut shim that time, should to be bonded That one -year period also matches 0 SHIM LAMINATING METHOD uses laser cut the limit of the manufacturer's war- thin sheets of heat bonded paper to build up ranty on the BDM40. a composite object with low materials cost. The Wavetek BDM40 doesn't adhesive laminated assembly contain many "bells and whistles." Rather, it has a straightforward design that makes it right at home on a professional test bench. For reliable binder ink jet CERAMIC SHELL METHOD can selectively voltage, current, and resistance form ceramic powders by using an inkjet to measurements, the BDM40 shines apply suitable binding agents. through with its ease of use, highly ceramic powder visible 4Y2-digit LED display, and wide operating ranges. ft

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Regular readers of this col - the point that I've been a rock fan

umn are probably aware of since the sixties. I had supplied my strong interest in hearing sound equipment to a rock band, preservation. Obviously, I'm swim- had permanent passes to the Film - ming against the sonic tide, given ore East, the Cheetah Club, The the proliferation of killer car stereos, Electric Circus, and Max's Kansas

overdriven Walkmen, excessive City Upstairs. In other words, I was concert -hall levels, and various not simply a gray- bearded fuddy -du- other kinds of environmental noise. ddy complaining about the sonic ex- Recently, it all came home in an un- cesses of our youth.

expected way. I was puzzled by the subsequent One Friday during supper, my 10- lack of support on the issue. The year-old son announced that he'd middle -school principal seemed like to attend the 5th -grade disco mainly concerned that word of my dance taking place in the middle - measurements not get out to the

school cafeteria that evening. My parents. I don't know whether he wife dropped him off, and we looked envisioned hysterical reactions forward to three or four hours of Radio Shack's Model 33 -2055 digital SPL leading to lawsuits or simply felt that quiet, unsullied by various juvenile meter was used to measure the sound - my fears of hearing damage were demands and the sounds of Sega. pressure level at a middle -school dance. unwarranted. In any case, he said Alas, our dream of peace was not to the older grades were having a be. About 30 minutes later, we got a litely) was: (1) He has been con- dance the next Friday, and invited phone call from Nathaniel asking to ducting these dances for eight me to take more measurements.

be picked up ASAP! years and there had never been any I arrived there with Katie's mom, When he arrived home, Nathaniel complaints about the sound level, who had volunteered to take notes, said that the music was so loud it and (2) if he turned the sound down a Heath real -time analyzer /SPL

hurt his ears. My wife confirmed too far the kids would revolt. I testily meter, a calibrated Radio Shack that the sound had indeed been reaffirmed my point that at the exist- SPL meter -and earplugs. We very loud ( "It must be 120 dB in ing sound levels there was a real risk found a different DJ with different

there! "), and I thought it might be a of ear damage. I got nowhere and equipment putting out a more mod- good idea for me to visit the dance left vowing to continue the fight - erate -but still too loud -sound with my sound -pressure level (SPL) but I wasn't quite sure how. level. The readings were a con-

meter in hand. I found an unexpected and mili- sistent 90 dBa at the back of the Yes, things were pretty loud! At tant ally in a mother whose bright, room, and about 5 dB louder up the rear of the room, opposite the musically talented daughter Katie is front. One of the chaperoning moth-

platform where the DJ had set up in the same grade as my son. I told ers accosted me, saying that she his speakers, the measured SPL her of my experience and provided couldn't understand my point of

was about 95 dBa. At a distance of some background articles on view -would I rather have the kids 10 feet in front of the speakers I OSHA and hearing damage. She wandering around out in the street measured a steady 110 dBa with the did some of her own research, be- than at the dance? Obviously, meter set to slow response. Want- came terribly concerned, and wrote someone had spoken to her and ing to protect whatever hearing I a letter to the school principal outlin- probably to the DJ also. have left, I decided not to climb up ing the situation and my SPL read- Incidentally, the day after my ini-

on the platform with the speakers ings. She asked for a meeting with tial meeting, I happened to run into

where a dozen or so kids were dig- him and other concerned parties, Katie and one of her friends. I asked ging the vibes, literally. including the members of the PTSA Katie how she enjoyed the dance, Upset about the potential ear health committee. and whether the sound was okay. damage inflicted on my son's She said that when she left after

friends and classmates, I sought out The fuddy -duddy factor three or four hours, she had felt a

the teacher in charge of the pro- The meeting didn't go quite as I sort of pressure in her ears, but it

ceedings. I told him of my concerns, had hoped. I opened the proceed- was gone by the next morning. Her and suggested that he have the DJ ings by distributing background ma- friend said that her ears were ring- turn down the level at least 15 dB. terial and outlining my concerns and ing after the dance, but her symp-

78 His response (delivered very po- the reasons for them. I also made toms also faded by the next day.

www.americanradiohistory.com Eleamia nraádoara

When I happened to mention that to What do I mean by "venue- appro- the principal, he appeared to be priate ?" During the mid -sixties, more upset by the fact that I had when I was loosely associated with asked the question than by the kids' a rock band called the Group Image, responses. Again, he strongly I recorded a rehearsal at a friend's urged me not to talk to anyone loft. My equipment consisted of two about the situation. reasonably good mikes plugged di- There the matter rests for the mo- rectly into a Teac 101/2 -inch open - ment. I've not yet passed on my new reel recorder, and a pair of good measurements, but I'm not at all isolating headphones. Playback hopeful about how gladly they will was provided by my friend's stereo BOOK II HOW TO GET ANYTHING ON be received. To be continued ... . system in the same room. After ANYBODY -Lee Lapin! Cutting edge audio/ shifting around the band members video surveillance, read computers, bypass passwords, see in the dark, obtain unlisted and microphones for about 15 min- Sonic reality phone numbers, intercept cellular calls, pag- Last weekend I attended a gos- utes, I finally achieved a reasonable ers, and faxes, trace and track anybody, sur- pel -music concert given in a small stereo balance in the phones. I veillance proof any room, tap any phone, auditorium. The room was packed started the tape and went into the WHEW! "Really scary stuff" -CNN. $34.95 INTELLIGENCE INCOR- and we were seated well toward the adjoining room to talk to my friend + $5.00 shipping, PORATED, 2228 El Camino Real, #349 -2, rear. Nevertheless, I was struck while the band and singer wailed on. San Mateo, CA 94103. 1- 800-805 -5544 or- once again by the very audible (to The band stopped fora break, but ders only. me, at least) differences between since I knew there was plenty of CIRCLE 184 ON FREE INFORMATION CARD live concerts and sound reproduced tape I didn't bother to switch the MPE & ET -9 in the home. recorder off. I heard the band start POSTAL EXAM As I see it, the essential purpose up again doing the same number, STUDY GUIDE of high fidelity is to create the illu- and I wandered back to suggest

. sion of being in the presence of a they do something different. But I b . »- live performance. Honest au- wasn't hearing the live band: they diophiles are aware of how seldom were playing back the rewound that ideal is realized, despite their tape. And listening from the adja- endless upgrading and tweaking. cent room through a wide doorway, I The dozen or so times that I've had couldn't tell the difference! To say ELECTRONIC & MECHANICAL -Newly released a manual dedicated to the E.T-9 & a legitimate "I-am- there /they -are- the least, I was flabbergasted. What MPE -6 Postal Exam. The manual will ac- here" experience with reproduced I heard flew in the face of everything quaint you with more than 95% of the Exam. sound occurred when I was listening I had read about the deleterious The manual is printed in easily understand- to: (1) binaural reproduction through effects of "doubled room acous- able text, illustrations and diagrams. The headphones, (2) multichannel set- tics" -which is what happens when manual covers: electronic, electrical, mechanical, digital, math, chemistry, termi- ups, or (3) stereo "venue -appropri- the normal room reverberation nology, patterns, etc. A pretest is included to ate" reproduction. caught on a recording is reinforced test your readiness. The manual sells for Let me elaborate. Binaural repro- unnaturally by playback in the same $12.95 + $2.00 S&H, ck or mo made payable to T.H.O.T. Inc. For information or copies write duction of sound recorded with a room. Since I had the band at hand, I to: T.H.O.T. Inc., P.O. Box 16422, Atlanta, microphone installed in a dummy did some quick live-versus -record- GA. 30321 -0422. head can be impressively realistic. ed tests. Yes, there was a discerni- CIRCLE 182 ON FREE INFORMATION CARD When its well done, there's no ble difference during A/B com- sense of the sound coming from the parisons, but from the next room A headphones; rather, one enjoys the and B were equally "live." audible illusion of being in a totally Over the years, I think I've been different sonic environment. able to pin down the subjective dif- Multichannel sound can also be ferences between a live perfor- extremely realistic if the recording mance and a state -of- the -art com- ENERGIZER and playback are properly ex- mercial recording. For one thing, the ecuted. I've heard a four-channel extreme highs heard live have a tape that transported me into the crystalline quality that is almost al- CRYSTAL-CONTROLLED! 5 MINUTE AS- presence of an invisible, but won- ways lost in reproduction. To my sur- SEMBLY! MONEYBACK GUARANTEE! At- whisper up to 2 derfully audible, grand piano. It was prise, I can still hear that difference tach 3 wires and hear every being played right over there! About despite my age- induced high -fre- miles away on any programmable scanner or VHF surveillance receiver. Pre- tested surface loss. I there's a 15 years ago, Acoustic Research quency But believe mount module uses standard 9V battery for demonstrated for me an experimen- more important factor at play. I call 100mW output! Includes battery box and tal 16- channel setup that, in terms of it, for want of an established term, crystal for 140MHZ. Custom frequencies I-am-there realism, left nothing to be the Klein theory of sonic -venue ap- available for Law Enforcement. Model VX -100 + 2.00 &H. VISA, MC, MO. desired. And I've heard other im- propriateness (SVA). only $79.95 S COD add $5.00. DECO INDUSTRIES, BOX pressive multichannel demos dating Somehow our ears find fault with 607, BEDFORD HILLS, NY 10507. back at least 25 years. Continued on page 85 914-232 -3878. 79 CIRCLE 127 ON FREE INFORMATION CARD

www.americanradiohistory.com DRAWING BOARD This month we build the PLL section of our tachometer.

ROBERT GROSSBLATT

Before I get started this The first thing to do is determine tor. The phase detector compares month, there's some un- the criteria for the design. You can the VCO's output with the input fre- finished automotive -related change any of these things later on quency and it outputs the difference business to take care of. Some if you want. between the two frequencies as an months ago I mentioned that while 1. The tachometer will read from error voltage-the greater the dif- two stroke engines had just about 500 to 5000 rpm. ference, the higher the error volt- disappeared, they were still used in 2. It will have a three -digit LED dis- age. chain saws. I wondered if anyone play. Feeding the error voltage back to out there knew the reason for that 3. It will update once a second. the VCO forces the VCO to track and, sad to say, I've gotten only one 4. It will work with any number of the input frequency. The VCO out- right answer in the mail so far. That's cylinders. put in a standard PLL circuit is a right, a lot of mail but only one cor- As I mentioned earlier, the heart clean and squared -up version of the rect answer. of any PLL circuit is the design of input frequency. To put the matter to rest, the rea- the loop filter. To understand why, Any time you talk about compar- son that two -cycle engines power take a look at Fig. 1, the block di- ing frequencies (or even voltages), chain saws is simply because a agram of a typical PLL. The output two things have to be considered. chain saw has to be able to run up- of a voltage -controlled oscillator The first one is a function of time. side down. It can't have an oil sump. (VCO) is routed to a phase detec- (How long should the sampling During the more difficult maneuvers with the saw, the saw must be turned upside down. If it had a four- D/ V/06 BY N O 5/6/VAI- cycle engine, the oil would leave the OLI TP1J sump bottom, the oil pump would 3 run dry, and the engine would "-pop seize. 5/6tG4tLO /1 PHASE LOCKED Congratulations to John Lindsay of //1/PUT /3 (4LO+L 6) 9 Paramus, New Jersey for providing /z the right answer. And now back to the tachometer. EL Using a phase -locked loop as the basis for the tachometer a lot does r- to simplify the design of the circuit -t but, as I noted last month, it's not a I RS totally trouble -free solution. Engine ( RI speed is never constant, and as rpm e,s drops, the variations in engine )17' speed become a larger and larger L1 LOOP F /LTER percentage of the mean speed. By the time it is returned to idle speed, FIG. 1 -THE HEART OF ANY PLL CIRCUIT is the loop filter. the variation is often more than 10 It %. can be even higher if the # OF DEGRE4S/ SPAR es' / period be before the comparison is engine timing is off or something N rn CYL SPARK REV made ?) The second is a function of rn else isn't right with the engine. inertia. (How quickly should 2 36 0 / 60 the This erratic behavior causes 1 /80 2 30 comparator respond to changes s' problems regardless of the design 6 /.Z 0 3 20 that show up during any particular of the tachometer. It's a B fo 1 /5 o especially sampling period ?) y problem with a PLL -based design Those two factors are decided by .. because the accuracy of the mea- FIG. 2 -THE SPARK RATE from the coil the loop filter, which is why the filter surement and the stability of the depends on the number of cylinders in is the most important part of the the engine. For other engines, just di- output rely on the design of the loop circuit. The loop filter in a 4046 is vide the number of cylinders into 120 to filter. I'll go through a real example give you the divide -by number for the made up of just two resistors and a 80 so you can see what I mean. PLL. capacitor, but don't be fooled into

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CIRCLE 181 ON FREE INFORMATION CARD

taking these three components too I've been talking about is the signal through this last time and I've sum- lightly since they control the opera- from the ignition system, it's impor- marized the results in the table of tion of the PLL. A poor design will tant to know what the expected Fig. 2. make the tachometer worthless. spark rate from the coil is going to The tricky part of designing a ta- The PLL's sampling period is de- be. The tachometer is being de- chometer with a PLL is to come up termined by the product of RS and signed to work with engine rpm's with the appropriate divide -by Cs, as shown in Fig. 1. If the RC from 500 to 5000, and the rate of number for engines of different period is too high, the tachometer spark (from the coil, not to any par- sizes. Since the circuit is counting will be sluggish, and if it's too low, ticular plug) depends on the number sparks and its display should be up- a the tachometer will be too erratic. of cylinders in the engine. I went dated every second, conversion The inertia of the loop is determined by RI. If that value is too large, the tachometer will take a long time to D/v/DE 8 V /l/ C S/GNs1L c SEE TEXTJ OUTPUT reflect changes in the input frequency, and if it's too small, the tachometer will probably overshoot .0 LI_ /6 and will definitely oscillate around 4/046 9 the input frequency. RS 6 A divide -by circuit can be in- CF stalled between the output of the /MEG REI/ 5lî00PF VCO and the input of the phase 300 detector to make the PLL even more useful. By raising the VCO center frequency to N times the expected center of the input frequency and dividing the VCO output by N before it gets to the phase detec- / ,ez tor, the VCO output can be made PO/NTs equal to a frequency that is N times the test input and is also locked to c/ c/ the test input. 6BpF This all sounds terrific but there's = e,vqss/5 a catch: you have to decide what the (ie0 vND center of the input frequency is go- FIG. 3 -THE FINAL CIRCUIT. The loop component and VCO values are good starting ing to be. Since the input frequency points for the frequency range we agreed on. 81

www.americanradiohistory.com factor that will translate the number ter frequency is set by the capacitor compressed more efficiently than of sparks per second into engine straddling pins 6 and 7, and the up- others. Text and data files can often revolutions per second is neces- per frequency is set by the resistor be squeezed down to 10% of their sary. The conversion numbers for between pin 11 and ground. An off- original size, while executable and various engine sizes are shown in set frequency can be added by put- other binary files can be com- Fig. 2, but if you have some other ting a resistor between pin 12 and pressed only by about 30% or so. kind of engine (a five -cylinder Audi, ground. If you leave out that last The claim of being able to double for example), you can work out the resistor, the VCO's minimum fre- disk space is a statistical expecta- conversion number yourself. To quency will be 0. You can make a tion, and not always a measurable make things easier, just divide the much more intelligent estimate of reality. But as long as the algorithms number of cylinders into 120 and the starting component values by are stable and the compression that will give you the divide -by going through the manufacturer's schemes are reliable, it would seem number for the PLL. data sheet. that the increase in storage space is Now all that's missing is the time - Once you have the circuit as- well worth the cost of the soft- base for the counter and the display. sembled, connect an oscilloscope ware- usually less than $100. it Both of these sections are similar to to the output and watch the wave- things we've done many times be- forms as you experiment with dif- fore, and you should be able to de- ferent loop- filter component values LETTERS sign them with your eyes closed. If to stabilize the tachometer output. If you keep notebooks (another thing you see a lot of wild swings on the continued from page 18 I've talked about many times before scope, chances are the PLL is going and always encourage readers to out of lock. If the scope shows that do), you'll undoubtedly find loads of the PLL response is too sluggish, timebase and display circuits. you'll have to change the compo- There are lots of ways to generate nents to reduce the loop settling

an accurate 1 -hertz signal, but I time as was disclosed. think the easiest way is to use the When we get together next time 5369EST from National Semicon- I'll work out the details of a second ductor. A colorburst crystal con- approach to tachometer design. I'll nected to one end of the IC also put together a display circuit produces a 100 -hertz signal out the that can be used for both ta- other end. By adding a pair of 4017s chometer circuits. st

to the circuit, a 1 -hertz timebase for the tachometer can be produced at a very low cost. O&A Make sure you get the "EST" version of the 5369 chip (it produces a continued from page 12 R5). The input stage collector cur- 100 -hertz signal) rather than one rent is easily set by R2, and the with an "AA" suffix (it generates a the increase in storage space that output stage collector current is 60 -hertz signal). If all you can find is you can obtain with compression easily set by R5. the AA version, you'll have to build a software depends on the kind of The output stage operates as a divide -by -60 circuit, but that should files you have on your hard disk, current source, offering excellent be no problem either -the two there's no doubt that the software power supply rejection. AC current 4017's can divide by 60 just as easi- works. gain is easily set with ratio of resis- ly as they can divide by 100. They The heart of this type of software tance values for R3 and R4. The just have to be wired differently. is the real -time compression and circuit is independent of transistor The final circuit is shown in Fig. 3. decompression algorithms that characteristics, and is simple It's a good idea to build the circuit write and read to the hard disk. In enough so that it is likely to work the and try it out before deciding that it's the early days of disk doublers, the first time you power it. the one you want to use. The loop software would occasionally cause You listed no references in the component and VCO values shown errors that resulted in the loss of article so I would like to contribute in the schematic are good starting data but, these days, the whole op- two titles: The RCA Audio Amplifier points for the frequency range we eration is virtually invisible. The Manual (APA -551, 1979) is quite de- agreed on, but you can play around technology has improved to the tailed on both with discrete compo- with the values and try to tweak point where the data is just as safe nents and IC's. Jack Darr's Electric better performance out of the cir- as it would be if the doubling soft- Guitar Amplifier Handbook (Sams cuit. I don't think there's any way to ware were not used. 21443, 1977) is even more com- completely avoid jitter at low engine Just about the only disadvantage prehensive. It includes detailed rpm, but that's something you to disk compression is that you nev- schematics and servicing tips for should determine for yourself at er know for sure exactly how much various circuits. your own testbench. room is left on the drive. That's be- MARK WILLIAMSON 82 Remember that the VCO's cen- cause some kinds of data can be Rockford, IL

www.americanradiohistory.com resistance- capaci- co's line of digitally con- NEW LITERATURE and tance waveshaping. This trolled power supplies. It continued from page 29 second edition has been details the various com- improved with new graphs, munication and control op- clear. He tells the reader drawings, and four new tions offered with Kepco's when and why certain chapters covering the math series MBT 360 -watt, in- kinds of math are needed related to multimeters, os- strumentation- grade, volt- to solve electronics prob- cilloscopes, transistors, age- current stabilizers. The com- lems. The answers to all of and computer numbering CIRCLE 346 ON FREE units permit the sample problems are systems. INFORMATION CARD munication over the given in an appendix. IEEE -488 bus through a tions for the microterminal two -wire serial bus that can Microterminal Catalog. product line. Discussions link up to 27 units to a host Burr -Brown Corporation, of accessories and pe- E 6550 South Bay Colony ripherals are also included. Drive, Tucson, AZ The Microterminals are 85706 -7148; Phone: available in a wide variety of 800 -328 -2526; Fax: cases, functions, key- 602-741 -4240; free. boards, and displays. IR Microterminals are CIRCLE 345 ON FREE small, rugged units de- INFORMATION CARD signed as operator inter- Can We Talk ?. Kepco, Inc., face /control panels and Attn: Mrs. Alexandra Dun - Included in this marh data -collection terminals. leavy, 131 -38 Sanford Ave- CIRCLE 347 ON FREE book are explanations of This 12 -page catalog from nue, Flushing, NY 11352; INFORMATION CARD scientific and engineering Burr-Brown contains prod- Phone: 718 -461 -7000; Fax: notation, sine waves, trans- uct specifications, pic- 718- 767 -1102; free. PC, or it can communicate formers, inductors and ca- tures, and information on This six -page, four-color with an RS -232 inter- pacitors, time constants, key features and applica- brochure describes Kep- face. 12

MEASURING NI -CAD RESISTANCE Mathematically, the values of RL, Q&A's reply to T. Ng, who asked and RL2 are arbitrary, so one is free in the February Q&A column about to choose them based on practical measuring the internal resistance of considerations. One convenient nickel-cadmium cells and batteries, choice is to set an open circuit as was long on sarcasm and short on one of the load conditions -say, re- solid technical fact. Although Q&A sistor RL,. apparently does not agree, the inter- As a result, the corresponding 2. nal resistance of a battery is one of FIG. current I, is zero and the corresponding voltage V1 is Vb, the its critical specifications. resistance, and V and I are the cir- That resistance determines the cuit's terminal voltage and current, open- circuit voltage of the battery. battery's terminal voltage versus respectively. Another choice is to set values of load current characteristic. There- With basic circuit analysis, it can RL, and RL2 that approximate the fore, it determines how much cur- be seen that for any RL: actual load anticipated for the bat- rent can be drawn from the battery Vb =V =RbI. tery. By doing that, Rb is computed without an objectionable drop in For a sepecific load resistance, as a small -signal value at the nomi- voltage. That resistance also deter- RL,, the relationship becomes: nal operating point of the battery. mines the external voltage that Vb = V1 + RbI,, DONALD M. KELLER, Ph.D., P.E. must be applied to the terminals of Where V1 and I, are the values of V Blacksburg, VA the battery to force a given current and I for this load. through it for recharging. Similarly, for another specific load ANTENNA BOOSTER CORREC- Furthermore, Q&A's procedure resistance RL2, the relationship is: TIONS for computing the internal resis- Vb= V2 +Rbl2. In the article "Tunable FM Anten- tance in incorrect. In general, the Equating the right -hand sides of na Booster" (May 1994, Electronics proper procedure requires two the last two equations and solving Now), resistor R1 in Fig. 3 (Parts loads. It is easily developed by refer- for Rb give the desired result: Placement, p. 50) should terminate ring to the simple schematic Fig. 2. Rb = (V2 V1) /11 12). on pad 3. Also Q1 and Q2 are spec- In that diagram, Vb is the internal Thus, the internal resistance of the ified correctly in Fig. 2 (amplifier or open- circuit voltage of the bat- battery is the ratio of differences in schematic, p. 50) but incorrectly in tery, and Rb is its internal resis- voltage and current for the two the Parts List. Both are 2N3904 tance. RL is an arbitrary load loads. NPN transistors. Si 83

www.americanradiohistory.com AMATEUR TV STATION stage with a low- noise, dual - This corresponds to channel 3 gate GASFET, a double -bal- or channel 4 (VHF TV) so that a continued from page 40 anced diode mixer, an IF ampli- standard TV receiver can serve fier, and a varactor-tuned local as an IF amplifier and display the oscillator frequency to oscillator. monitor for the transceiver. change about 20 kHz per volt of Signals from the antenna Components D10, R52, C62 applied signal. About 2 to 2.5 pass through relay RY1 to a tap and C63 provide a regulated 9- volts p -p is required for 25 -kHz on antenna coil L16. The coil is volt DC source for the oscillator, deviation of the 4.5 -MHz sub- tuned to signal frequency (420 and C60 provides feedback. The carrier. About 6 to 7 millivolts of to 440 MHz) by trimmer C43. LO signal is fed to mixer M1 audio signal is required at the Diodes D7 and D8 protect the through R44 and R45 from a base of Q4 to obtain full devia- gate of RF amplifier Qil from tap on L21. The IF signal is tion (25 kHz). excessive RF' levels that might taken from pins 3 and 4 of Ml The FM 4.5 -MHz subcarrier is damage it. Transistor Q11 is bi- through lowpass filter L19 and taken from the source of Q5 ased to about 10 milliamperes C52, and coupling capacitor through C42. The value of C42 drain current. C53. The IF amplifier Q12 is bi- sets the subcarrier level; C42 Capacitor C50, a value of ased by R43, R42, and R41. Coil also removes the DC level pres- about 0.6 picofarads, built into L20, C56, and C57 are resonant ent at this point. If it were not the PC board layout, couples RF at the IF frequency, and they removed, it might change the into the tuned circuit consist- match the collector circuit of effective Q point of the video ing of C51 and L18. A tap on L18 Q12 to 50 to 75 -ohm loads. amplifier. The audio subcarrier The downconverter has sepa- is fed to the video amplifier Q7 rate supply lines for the RF am- where it is mixed with the video plifier (TP4) and the mixer-LO- signal. This design makes a IF section (TP5). During trans- separate sound transmitter/RF mit, Vcc is removed from the RF system unnecessary. amplifier (Q11 and associated If desired, optional switch S2 components), but the mixer - can be inserted in series with LO-IF is still functional. This al- R29 to disable the audio subcar- lows the operator to pick up rier. This is often done in ATV some transmitted signal with work, where a separate audio the downconverter and see it on link (such as a 2 -meter FM) the receiver -a handy feature might be used instead. With for verifying transmission. The this modification, it will not be downconverter gain is cut from necessary to turn on the video about 33 dB in its receive mode transmitter to talk, and it is to about a 10 to 20 dB loss. If the useful during test and setup downconverter feature is not procedures. If S2 is not needed, needed and you want to disable install the jumper across the THIS ATV UNIT contains a built -in CCD it completely, the downcon- switch pads on the PC board. camera module and rechargeable bat- verter mixer-LO -IF lead (TP5) ATV tery pack. Its a hand -held wireless TV The Mini has Ale same transmitter in itself. can be fed from + 12 -volts in the audio circuitry as the 5 -watt receive -only mode, as in the RF transmitter circuit with one ex- can match the input impedance amplifier. ception. The Mini -ATV requires of double -balanced mixer M1 to To monitor transmission 9 volts to operate, so the 9 -volt the tuned circuit. Mixer M1 is quality, a line sampler circuit is regulator D6 in the 5 -watt ver- fed with a local- oscillator signal included. This circuit samples sion is replaced with a 6 -volt di- of about +7to +10dBm(500to the transmitted RF signal, de- ode (D3) in the Mini -ATV Also, 700 millivolts). Oscillator tran- modulates it, and feeds the de- the varactor diode (D2 in the sistor Q13 is biased by R47, tected (demodulated) video to Mini ATV) is biased to the full 6- R48, and R49. The collector cir- an emitter-follower output buff- volt regulated voltage, through cuit consists of oscillator induc- er and then to an output jack. R23. The ATV Jr. , of course, has tor L21, trimmer capacitor C57, Refer to Fig. 6. Capacitors C64 no audio channel so there are and varactor diode D9, in series and C65 form a capacitive volt- no audio components on the PC with 5.6- picofarad capacitor age divider across the RF power board. C58. The DC bias is applied via amplifier output line. About 1.5 z R51, R46, and potentiometer volts of RF signal is available Downconverter R50. from the divider. Diode Di l is an z The downconverter, antenna The setting of R50 deter- envelope detector that produces 8 relay, and line sampler section mines the bias on D9 (from +1 a negative video signal. The vid- of the 5 -watt to + 9V). e transceiver are It tunes the LO fre- eo is fed through RF choke L22 shown in Fig. 6. If you are build- quency from 350 to 380 MHz; to the emitter of Q14. The de- w ing only a transmitter, you can this will provide 60 to 72 -MHz IF tected video appears across skip this section. The downcon- frequencies over the input sig- R56. 84 verter consists of a tuned RF nal range of 420 to 445 MHz. The base bias of Q14 is set at

www.americanradiohistory.com What's more, no liquid will leak out if about +3 volts through re- WHAT'S NEWS sistors R54 and R53 and bypass the battery is cut or punctured; this capacitors C66 and C67. Be- continued from page 6 makes it safer to install and use." cause Q14 is an emitter -follower, The new power cell is a refinement a low impedance video output is of one announced by Bellcore in late produced. Capacitor C68 cou- 1992, which had a liquid electrolyte. ples video to the line sampler The new solid form of lithium -ion output jack. Sufficient output cell consists of five active layers en- (about 1.5 volts) is available to cased in a metallized plastic bag drive most monitors. If more or that keeps out contaminants. Read- less output is desired, change ing down from the positive side they C65 to 6.8 or 15 picofarads, re- are an aluminum mesh, a plastic spectively. If a variable output is anode layer containing manganese a needed, substitute trimmer oxide (the positive pole), and then a 5 to 20 with a value of layer of plastic that appears solid. It picofarads in place of C65. (This structure change was not found to be nec- is actually a porous plastic essary in the prototypes.) impregnated with liquid electrolyte. Below that is the plastic cathode Relay RY1, a DIP reed relay, is activated through R35 and by- layer containing carbon (the nega- pass C42 by voltage from the tive pole), and at the bottom is cop- transmit supply lead. The relay per mesh. The manufacturing process calls for fusing the layers has about 0.7 to 0.8 dB loss, but FIG. 2- PROTOTYPE, PLASTIC, re- switching RF at 440 MHz at a chargeable lithium -ion battery is held by together with heat. reasonable cost is not easy. The Bellcore scientist Jean -Marie Tarascon. When the power cell is being relay can be omitted, and the RF charged, lithium ions from the output from the transmitter weigh half as much. Moreover, they anode pass through the electrolyte and the RF input to the down - say lithium -ion technology poses layer and collect on the cathode. converter could be brought out none of the environmental problems The reaction is reversed when cur- to separate jacks. of the most commonly used re- rent is being drawn from the cell: chargeable cells and batteries current flows across the terminals in Next month based on nickel- cadmium or lead - the opposite direction. That's all for this month. If According to Bellcore, their you want to build any ATV unit, acid chemistry. "This is the first plastic, solid - lithium -ion cell has twice the energy all the parts you'll need collect says density of a nickel- cadmium (Ni -Cd) for the unit you want to build. state rechargeable battery," - cell and 40% more than a nickel - Next month's article will tell you Jean -Marie Tarascon, leader of Bell not metal hydride (Ni -Mhd) cell. Each how to build the ATV circuits. it core's battery team. "It does contain such toxic metals as lead, cell produces a nominal voltage of cadmium, mercury, or cobalt. Continued on page 89 AUDIO UPDATE continued from page 79

reproduced sound whose recorded CABLE CONVERTER acoustics are at odds with the DIAGNOSTIC MODULES} acoustics of the room in which it is PIONEER BOARD 3 -WIRE 1 PC 10PC INSTRUCTIONAL VIDEO TAPE FOR being reproduced. It just doesn't - -61)0( 34.95 29.95 BA -51)0( BA DIAGNOSTIC BOARDS $19.95 live. The sound is a lot more - -67)0( 44.95 39.95 sound BA -63XX BA PIONEER DIAG. CUBE 129.95 6- DPV -5XXX 24.95 19.95 realistic when we are listening bin - STARCOM 60 DB NOTCH FILTER INCL STARCOM 7- DPV -7XXX 39.95 34 95 aurally through headphones - AUDIO -7)00( 39.95 34.95 EW STARCOM means no listening -room STARCOM 7- DPBB which S/A 8535 AUTO BOARD 34.95 29.95 BOARD FOR DPBB R1 / M1 acoustics -when the listening - S/A 8536 AUTO BOARD 34.95 29.95 AND REALATED MODELS 59.95 room acoustics are swamped out by S/A 8550 WIRELESS QUICK BOARD 39.95 34.95 ZENITH 1000 TO 2660 16.95 multiple channels, or when the re- S/A 8570 WIRELESS QUICK BOARD 39.95 34.95 TOCOM 5507 MAPPER 19.95 S/A 8580 WIRELESS QUICK BOARD 39.95 34.95 TOCOM 5503 MAPPER 19.95 cording is played back in the same IN ANY S/A 8590 WIRELESS QUICK BOARD 39.95 34.95 ANYONE IMPLYING THEFT OF SERVICE it was made. WAY SHAPE OR FORM. DO US AND YOUR SELF room S/A 8600 WIRELESS QUICK BOARD 39.95 34.95 A FAVOR DON'T BOTHER CALLING US. AND YES WE DO MEAN YOU' In any case, listen to some live, + MICRO 39.95 34.95 S/A 8580 40 PIN PLUS THESE PRODUCTS ARE FOR DIAGNOSTIC minimally -amplified performances S/A 8570 /90 /8600 40 PIN MICRO 39.95 34.95 PURPOSES ONLY PERIOD III against the best recorded material WE STOCK WIRELESS VISUAL COMMUNICATIONS, INC. FOR at hand. What differences do you QUICKBOARDS 718-229-2358 ALL S/A CONVERTERS 00 -GO -CABLE TECH.SUPP hear? I would be interested to know C if you think my SVA theory holds CIRCLE 183 ON FREE INFORMATION CARD water. it 85

www.americanradiohistory.com COMPUTER CONNECTIONS

And then there were none.

JEFF HOLTZMAN

This year is shaping up as an eventful one for the computer industry. So far, several new technologies have been introduced, and several significant business events have occurred. Those events that happened in the first quarter of 1994 will have a dramatic, long -term effect on the computer industry: Apple introduced the first PowerPC -based Macintoshes. AMD, NexGen, Cyrix, and IBM intensified the assault on Intel's dominance of the microprocessor market. Intel retaliated by introducing enhanced versions of its 486 and Pen- tium CPU's. Novell initiated a buyout of Word- Perfect. FIG. 1- APPLE'S NEW POWERPC -BASED MACINTOSH line introduces RISC -level performance at desktop prices. SoftWindows technology from Insignia Solutions lets PowerPC DOS and Windows programs run in emulation mode at 486125 speeds. PowerPC is an overloaded term that can mean: 1) A microprocessor, Many analysts believe that Apple The PowerPC could do that be- 2) A family of microprocessors, 3) A needs a RISC processor because cause one of its key technical and member of IBM's RS /6000 work- the Motorola 680X0 micro- marketing features is emulation station family, 4) A personal com- processor family (on which Apple's technology that allows DOS, Win- puter made by IBM, 5) A personal computers are based) simply ran dows, and Macintosh applications computer made by Apple (which out of steam. Without going RISC, to run as -is on PowerPC machines. calls its version Power Macintosh, Apple would be stuck in a dead Both IBM and Apple are promot- shown in Fig. 1). end -or it would be faced with the ing the idea that RISC provides en- PowerPC started out not as a mi- prospect of moving to the Intel (or hanced performance, lower cost, croprocessor, but as a multi -chip some other) platform. (That's a tac- and backward compatibility. At one central processing unit (CPU) corn - tic Apple is pursuing anyway, just in time, the PowerPC triumvirate plex used by IBM in its RS /6000. case). Similarly, if Motorola were go- seemed to be promoting the idea When IBM, Apple, and Motorola ing to stay in the microprocessor that a PowerPC is a PowerPC is a teamed up in 1991, one of their market in a serious way, it would PowerPC -in other words, that prime objectives was to build a sin- need something new. compatibility would extend across gle -chip version of that RS /6000 IBM's reason for joining the the major players' product lines. It processor, then dubbed the PowerPC partnership is less clear. now appears that such is not the PowerPC. Power, by the way, is The company has a close rela- case. IBM's PowerPC boxes will run IBM's acronym for "performance tionship with Intel, including man- DOS and Windows software optimization with enhanced RISC." ufacturing rights for the 486. (IBM through emulation. They will also RISC is also an acronym; it stands builds enhanced versions of the 486 run native versions of AIX (IBM's for reduced -instruction -set comput- and sells them as parts of both version of Unix) and OS /2. IBM's ing. In stark contrast to RISC, CISC boards and systems.) Some indus- PowerPCs won't run Apple's Sys- stands for complex- instruction -set try observers have suggested that tem 7 software or any applications computing. To understand the dif- IBM joined the PowerPC partner- written for that operating system. ference between these terms, see ship because it desparately wants Similarly, Apple's PowerPC the sidebar "RISC vs. CISC." to dethrone Microsoft, particularly boxes will run DOS and Windows 86 Who needs PowerPC? And why? in the operating- system market. software through emulation. They

www.americanradiohistory.com Is there any will also run existing System 7 ap- From the Apple point of view, it ap- hardware platforms? software? In plications under emulation, and they pears likely that the company will compelling application my view, without good answers to will run rewritten System 7 applica- have no trouble converting its exist- Apple will find it tions in native PowerPC mode. ing user base. Those users can ben- those questions, going indeed. In both cases, the DOS /Win- efit immediately from the extra tough of view, the dows emulation software is ex- performance that native PowerPC From the IBM point pected to provide performance applications will provide, particularly company will have no trouble estab- lishing PowerPC in the RS /6000 equivalent to a low-end 486 -but for advanced graphics and multi- But IBM has also revealed both performance and reliability re- media development. Apple is going market. the mainstream main to be seen. Many people, in- after the PC market as well plans to conquer In fact, IBM has cluding myself, question whether Apple executives have vowed to desktop PC market. PowerPC di- success is possible with either. maintain Power Mac prices several established a separate is just that. IBM, for example, has had problems hundred dollars below those of vision whose charter pits that divi- keeping OS /2 compatible with suc- comparable Pentium boxes. Apple Doing so, of course, cessive releases of Windows. can do this because a PowerPC pro- sion against IBM's Personal Corn - largest maker of Moreover, with Chicago looming cessor can be manufactured for (by puter Co., still the PCs in the world. just over the horizon, IBM seems to one estimate) as little as 20% of the Intel -based And where is Microsoft in all of be in for even more trouble, es- cost of a Pentium CPU. Nonethe- porting all of its major pecially now that it no longer has less, Apple will find the PC market a this? Quietly run on both IBM and rights to Windows source code. tough sell. This market still views applications to In addition, Who will buy PowerPC boxes? Apple with suspicion. Why change Apple PowerPC boxes. Microsoft is also porting its software into a Unix -like operating sys- RISC vs. CISC tem, Windows NT, to run on IBM's Until March 1994, all PC's, Macin- released the 486. Intel touted it as box. In other words, regardless of toshes, Amigas, Ataris, Apple II's, having RISC -like features (primarily who wins the hardware wars, Micro- Commodores, Sinclairs, and CP /M pipelining and single -cycle execu- soft seems to have all bets covered. machines were based on CISC pro- tion of simple instructions). In terms cessors. By contrast, all engineer- of performance, the Pentium is Long term considerations even more RISC -like, but not in ing workstations, such as those Hypothesize for a moment that in Hewlett-Pack- terms of underlying complexity, built by IBM, Digital, ten years we'll all be running RISC and Silicon Graphics were which translates into higher cost. ard, Sun, processors. Who'll make the chips? based on RISC processors. RISC purists strongly object to call- How do RISC and CISC differ? ing any member of the 80X86 family Who'll make the operating system? RISC is based on a variation of the RISC -like. Regardless, Intel evi- The mainstream PC market (Intel- 80/20 rule. This rule assumes that dently found RISC alluring enough + DOS /Windows) has one more most software spends 80% of its as a marketing concept to start stop -the final stop -on the highly - time executing only 20% of the using it several years ago. coupled CP,U /OS line: Chicago. true available instructions. RISC pro- The PowerPC, however, is a Chicago is going to be a better Win- first one de- cessors attempt to optimize the per- RISC processor-the dows than Windows. It will have a for the high -vol- formance of that 20 %, and to keep signed specifically Macintosh -like user interface, along chip size and cost down by eliminat- urne personal computer market. It with a robust, OS /2 -like, 32 -bit, pre- ing the other 80 %. RISC does in represents the most serious at- emptive multitasking architecture. It software what CISC does in silicon. tempt in the industry to wrest con- RISC processors are marked by trol over micropricessors and will run only on Intel CISC chips. It the following characteristics: They operating systems from Intel and will be highly compatible with exist- have fewer than 150 instructions, Microsoft, and to transfer that con- ing DOS /Windows software. and most instructions execute in a trol to the Apple, IBM, and Motorola Two or three years will probably single processor cycle. They have partnership. pass before Chicago achieves the many CPU registers and high clock The PowerPC microprocessor is market penetration that Windows really a family of processors that in- rates. They provide instruction 3.1 currently enjoys. During that cludes four members, the 601, 603, pipelining for simultaneous instruc- time, Microsoft is expected to be decoding, and pro- 604, and 620. The 601 is the only tion fetching, developing and enhancing the next gram execution. version shipping now. It provides version of Windows, currently code - RISC processors have a rela- Pentium -level performance, but will tively small number of transistors, uses less power and costs less. The named Cairo. Cairo subsume which contributes to their low cost. 603 is a low -power version for lap- everything currently part of DOS, CISC processors, on the other top computers. Windows 3.1, Windows NT, and hand, have a larger instruction set, The 604, which should be re- Chicago. Cairo will also be a porta- fewer CPU registers, lower clock leased in about a year, will offer ble operating system capable of rates, larger numbers of transistors, twice the performance of the 601. running on Intel, PowerPC, and nu- and higher prices. Following that will be the 620, which merous other RISC processors. All it design goals, will The division between RISC and if meets current of Microsoft's applications will also and mar- provide truly unprecedented power CISC -both architectures be portable among these different kets -was crystal clear until Intel for a desktop system. 1t processors. 87

www.americanradiohistory.com Against this backdrop, consider der $3000. Systems that a year ago TAKE Apple and IBM with their respective were high -end 486 systems now BACK CONTROL PowerPC boxes and operating sys- sell for under $2000. continued from page 69 tems. Apple has always played to Intel is not standing still, however. the leading -edge graphics, publish- Intel recently introduced enhanced IBM -compatible disk, and he ing, and multimedia markets, and it versions of both 486 and Pentium will return a copy of the source - seems likely that Apple's PowerPC chips. The Pentiums include 90- and and object -code files for the up- will provide a smooth transition for 100 -MHz models, which are clock - dated version. those groups now. IBM, on the tripled 30- and 33 -MHz units, re- The author has written another hand, has no captive market spectively. other version of the firmware for that it can develop. Whatever Intel's DX4 CPU's are interesting the same project that will dis- PowerPC gains IBM is likely to devices, perhaps even more inter- play the name of the calling par- make must come at the expense of esting than the Pentiums. Judging ty instead of the number. This is the mainstream market, the from the name, you might expect for readers who live in areas workstation market, or Apple's loyal that they are clock -quadrupled, but where the CNAM feature is followers. they are not. They are clock -tripled, available. Also note that the new code is As I see it, IBM's only hope is the and pick up additional speed available on the Elec- mainstream market. Apple fol- through a larger cache (16 kilo- tronics Now BBS lowers are unlikely to convert en bytes) than prior 486's (8 kilobytes). (516- 293 -2283, v.32, v.42bis) as a file called CID2.ZIP. masse. Even if IBM somehow mag- There are several versions: a 100 - Figure 4 is the flowchart for ically converted the entire worksta- MHz model that runs on either a 33- the updated version of the firm- tion market, it would still be a or 50 -MHz bus; a 75 -MHz model ware. Notice that there are two relatively small fraction of the main- that runs on a 25 -MHz bus, and an separate paths, depending on stream desktop market. 83 -MHz model that runs on a 33- whether the is to x data found be PowerPC boxes are going to ap- MHz bus. The latter uses a 2.5 SDMF or MDMF. pear to the PC market just as PS /2 clock for internal operations. The The program also has a few and OS /2 1.0 did: proprietary, DX4s combine Intel's most ad- improvements. A provision has closed architectures foisted for no vanced architectures, including 3.3- been made to determine if the apparent reason on a market with volt operation, 5 -volt tolerant input area code is included in the no compelling need. Perhaps IBM buffers, a larger cache, and Intel's message. (Although it's rare, will build dual -processor PowerPC SL technology, which provides a one local telephone company de- machines (with the second pro- power management mode that is cided to leave out the area code cessor an enhanced 486). It might important in laptops and other ap- in its message stream.) So that have standard ISA /VESA /PCI plications where energy con- the project will work with short buses so that existing high -volume, servation is critical. initial ring pulses, the valid low -cost peripherals will be com- ring- detect has been decreased patible. The problem is that a dual - Business evolution from 0.5 second to 0.3 second. processor PC will be expensive. Novell, the largest network soft- To support longer pauses be- Nevertheless, IBM probably knows ware company, bought WordPer- tween the ring pulse and the better than any other PC manufac- fect, the market leader in word data stream, 0.8 second has turer how to manufacture efficiently, processing. Novell also bought been added to the time the program is allowed so it might be able to keep costs in Borland's to wait for a car- Quattro Pro spreadsheet. rier detect after receiving a ring line. So what? The deal shows just how pulse. In short, the PowerPC is going to scared software firms are of total In the original project, the help keep Apple afloat. In the near domination by Microsoft. Look at channel -seize signal occasion- term, IBM can be expected to throw another recently forged big -name ally bled through on the data lots of money into this project, but it alliance: Adobe (of PostScript fame) pin of the MC 145447 micro - might pay off by the time the market and Aldus (of PageMaker fame). controller. Provisions have been moves to Cairo, which is expected Now those two companies fit to- included in the new program to to run on any and all processors. By gether. They're in the same busi- fix that problem. ii that time, the market will have co- ness. They have the same custom- alesced into just a few high -volume ers. But Novell and WordPerfect? hardware manufacturers, and just a Look at it another way; see Table 1. REFERENCES few high -volume software pub- In terms limited to the raw tech- lishers. nologies available to them, the deal 1. Bellcore "Voiceband Data Transmis- puts Novell and Microsoft on rough- sion Interface Generic Requirements" Technical CPU Wars ly equal footing. Now look at the Reference TR- NWT-000030 2. Bellcore "Calling Number Delivery" The introduction of numerous Lotus column; there's a big gap at Technical Reference TR- NWT-000031 486 clones has forced Intel to be the top. Now look at the IBM col- 3. Bellcore "Calling Name Delivery Ge- more competitive, and that benefits umn. There's a big gap in the middle. neric Requirements" Technical Refer- ence TR- NWT-001188 consumers tremendously. Pentium - Hmmmm Remember you read 88 based systems now sell for well unit here first! S2

www.americanradiohistory.com writing that value to the output knowledge of software. This has PC I/O BREADBOARD port, and then checking for a been a brief, and it is hoped, continued from page 59 key press entry through DOS. painless introduction to pro- The call to DOS has interest- gramming. You've seen that as- of assembly, ing features. The purpose of sembly language offers power access features lot with the high -level control and DOS function 11 (0Bh) is to re- and speed, but it requires a features of C. port if a key press entry is wait- of planning and intimate error checking micro- (Note that 'Ibrbo C requires a ing. When engaged in that knowledge of its host separate product, Turbo As- function, it checks for a Ctrl -C processor to be used effectively. sembler, to make use of inline or Ctrl- Break; either will termi- BASIC, on the other hand, is it suf- assembly; Quick C has every- nate the program. easy to learn and use, but thing you need built in.) fers from low speed, and is bur- The final example, Listing 6, Wrapping up dened with antiquated lan- is a Quick C version of the The full potential of the com- guage constructs. For many switches -in, LEDs -out pro- puter (PC or mainframe) can be people, C is the ideal compro- gram. The first line of the pro- realized only with effective sup- mise. It allows low -level access gram instructs the compiler to porting software. Your success to the hardware when you need include a standard library of in any technical field today re- it, while simultaneously provid- functions for controlling the quires that you have a working ing all the advantages of a high - keyboard and screen. Every C level language. C is, however, ORDERING INFORMATION difficult to write (and read) program has a main function, available more The following items are BASIC. which begins on the next line. DAGE SCIENTIFIC, P.O. Box than from next of this article, Within the main function, two 144, Valley Springs, CA 95252, (209) In the part integers are defined: inp and 772 -2076: you will learn how to put the outp. They correspond to the in- Complete kit including manual and hardware and software to work port, all parts (model ST1) -$119 in a practical project: a flexible, put port and the output Set of 2 PC boards and manual respectively. It will loop forever configurable EPROM program- (model ST-2)-$40 control software is in (or until someone presses Ctrl - All orders add $3.95 shipping and mer. The Break) reading the input port, handling. CA residents add sales tax. BASIC. 1t

Go Check -In" into their rooms directly. WHAT'S NEWS that its "Touch and machine will do for hotels what the Two machines are now being test- continued from page 85 automatic teller machine (ATM) did ed at the Hyatt Regency O'Hare for banking. The check -in machine, hotel in a Chicago suburb and the which looks and works like an ATM, Hyatt Regency Atlanta in Atlanta, 3.8 volts, compared with the 1.2 allows guests with reservations and with an eye toward their eventual volts of the other cells. credit cards to bypass lines at the use chain -wide. inserts his The solid lithium -ion cells can be front desk and check themselves Upon arrival, a guest machine. This stacked and connected together to credit card into the produce batteries with higher volt- causes his previous room, bed, and to appear ages. Because the cells are thin and other check-in selections flexible, they can be formed into on the machine's monitor for his ap- prismatic batteries of almost any proval. When this procedure is com- in less than 90 shape needed. The battery form plete- typically would not be restricted by the cylin- seconds -the machine dispenses and a drical shapes typical of other re- one or more room keys the chargeable cells. Bellcore says that printed "passport" containing its lithium -ion cells can be dis- room number. the guest can charged and charged several hun- At check -out time, pay dred times with less capacity loss use the machine to approve and that are displayed than the other rechargeable cells. for room charges Lithium -ion batteries with liquid on screen. When that transaction is out a electrolytes have been on the mar- complete, the machine prints ket for only about two years, but receipt. plans to expand its they are still developmental models Hyatt Hotel to for limited applications. Japan start- Touch and Go Check -In program year. A future ser- ed a national project to develop dis- other hotels this per- tributed lithium -ion battery storage vice that could possibly be machine would be technology in 1992. formed by the AN AUTOMATED HOTEL registration interactive participation in the selec- machine, part of Hyatt Hotel's Touch and and the making of reservations Automated hotel check -ins Go Check -In system, speeds up guest tion Hyatt Hotel Corporation expects registration and checkout. for local restaurants. it 89

www.americanradiohistory.com TUNABLE ANTENNA THE LED -HEAD Figures 15 and 17 show two accurate, long -period relay continued from page 61 continuedfrom page 48 timer-control circuits whose functions do not depend on ter form. Place a tap at the sec- to mount the circuit board in a electrolytic capacitors. Film di- ond turn from the grounded suitable plastic box. The size of electric capacitors have been side of the coil, and insert a fer- the box will, of course, be deter- substituted. In both of those cir- rite slug in the form. Coat the mined by your choice of power cuits, IC1 is configured as a free - finished coil with clear nail pol- -battery or adapter. If you use running astable multivibrator. ish or lacquer before soldering it the four cells, you can mount In Fig. 15 schematic, a two - into the circuit. the holder in the bottom of the range, 1 to 10 minute and 10 to An F connector was installed box; if you choose an adapter, 100 minute relay timing control at the bottom side of the anten- mount the jack on the side of circuit, the astable frequency is na head for connecting the the box. divided down by IC2, a coaxial cable that runs between CD4020B CMOS, 14- stage, rip- the head and the controller. The Where to put the Face ple -carry binary divider. Con- antenna itself should be With appropriate packaging sequently relay RY1 turns on as mounted to the antenna -head the Electronic Face can become: soon as switch S1 is closed, and case with a neoprene washer to An novel desktop curiosity it turns off again when the keep water out of the unit. For and attention getter. 8192nd astable pulse arrives. the same reason, apply a bead of A night light for children's This provides time periods from silicone sealant around the edge rooms. 1 to 100 minutes, depending on of the lid. The finished antenna A holiday ornament to be the position of switch S2. head is shown in Fig. 3. hung on the walls, doors or even Figure 16 shows the func- On the antenna -controller a Christmas tree. tional and pinout diagrams of section, two -pole, three -posi- An novel automotive accesso- the CD4020B 14 -stage binary tion rotary switch S1 alIows tun- ry to keep the guy in the car counter. All counter stages are ing, the use of an auxiliary behind you amused when you master -slave flip -flops. The antenna, or the ability to switch are stopped at a red light. state of a counter advances one the unit off entirely. A two -posi- You'll probably think of many count on the negative transition switch can be substituted if more possibilities. s2 tion of each input pulse, and a you do not want an auxiliary an- high level RESET tenna. Also, because current sets the counter to its all zeros consumption is so low, the state. All inputs and outputs are switch can be omitted and the RELAY OUTPUT CIRCUITS buffered. battery left in the circuit perma- continued from page 54 The Fig. 17 circuit is similar nently where it might attain its to that of Fig. 15 except that an rated shelf life. Use shielded ca- additonal decade -divider stage ble to connect components- Si. ever, the period is determined is substituted for position 3 of R4, and J2-J4 to the rest of the by the switch position to either switch S2. This gives a max- circuit. electrolytic capacitors Cl (minimum division ratio of 81,920, Do not use an alkaline 9 -volt utes) or C2 (seconds), until the making it possible to time for battery because it could provide relay turns off. periods of up to 20 hours. This too much current for proper op- At that time, the control con- circuit is found in battery eration. Instead, install a car- tacts reopen and break the chargers and area security bon -zinc. battery. Warning! Do power connections to the cir- lighting systems with time -con- not take the required 9 -volt cuit. The timing cycle is then trolled turn -off. power from the internal circuit- complete. This circuit can be Figure 18 shows the func- ry of your shortwave receiver, turned off part way through its tional and pinout diagrams of even if the antenna controller is timing cycle by pushing RESET the CD4017B decade counter built into the receiver. House switch S3. IC, a five -stage Johnson counter the controller in a metal case, Standard aluminum elec- with 10 decoded outputs. In- because it will provide the best trolytic capacitors have very puts include a CLOCK. a RESET, RFI shielding. Figure 4 shows wide capacitance tolerance val- and a CLOCK INHIBIT signal. the prototype controller. ues (typically -50% to + 100%). Time -delay relays are coil and When the unit is completed, Moreover, they exhibit relatively contact EM relays with built -in allow a "burn -in" period for the large and unpredictable leakage timing circuits that delay con- tuning diode. Perform burn in currents. Consequently, their tact openings or closings for a by installing a battery, turning use in simple circuits such as preset interval. The time delays the unit on, and allowing the those shown in Figs. 13 and 14 are generated by an internal RC silicon crystal structure of the make them unsatisfactory for circuit or by counting cycles on diode to settle with a few hours precise timing of relay contact a 50- or 60 -Hz AC power line. of operation. That step proved functions. Also, they are unable The time delays are set with ei- to be necessary for many of the to time periods longer than ther a knob or a DIP switch on go units built. n about 15 minutes. the relay. tt

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PLEASE PRINT EACH WORD SEPARATELY, IN BLOCK LETTERS. (No refunds or credits for typesetting errors can be made unless you clearly print or type your See below for additional copy.) Rates indicated are for standard style classified ads only. CABLE TV 50dB NOTCH FILTERS for inter- 15 words. charges for special ads. Minimum: ference removal or channel censoring. Filters are user -adjustable to desired channel # or frequency. Eight Models available, each for 3 4 5 1 2 certain channels: 2 & 3; 4 to 6; 7 to 13: 14 to 17; 18 to 22; 23 to 29; 30 to 36; 95 to 99 plus 0 & 1. Just $30 each or 3 for $75, includes 6 7 8 9 10 shipping. ONE MONTH MONEY BACK, fast delivery. Visa, MC, check or M.O. (C.O.D. is $5 extra) Huge discounts for higher quan- 11 12 13 14 15 ($46.50) tities. STAR CIRCUITS, P.O. Box 94917, Las Vegas, NV 89193. Call 24 hours 1- 800 -535 -7827. 16 ($49.60) 17 ($52.70) 18 ($55.80) 19 ($58.90) 20 ($62.00)

DATA Acquisition for IBM compatibles. 12 bit 8 digital I'O 21 ($65.10) 22 ($68.20) 23 ($71.30) 24 ($74.40) 25 ($77.50) channel A -D converter $149.95, 48 line $89.95, 8 relay board $16.95, 8 opto input board $49.95. Disk with BASIC programs included. Control motors, lights, measure temperature, volt- 26 ($80.60) 27 ($83.70) 28 ($86.80) 29 ($89.90) 30 ($93.00) age. To get flier, Call or write to JOHN BELL, 1381 Saratoga St., Minden, NV 89423. (702) 267 -2704. CABLE test chips. Jerrold, Tocom, S.A -, 31 ($96.10) 32 ($99.20) 33 ($102.30) 34 ($105.40) 35 ($108.50) Zenith. Puts cable boxes into full service model $29.95 to $59.95. 1 (800) 452 -7090, (310) We accept MasterCard and Visa for payment of orders. If you wish to use your credit card to pay for your ad fill 902-0841. in the following additional information (Sorry, no telephone orders can be accepted.): ZENITH digital ST5612 converter /descrambler $189.00, with remote $199.00. Zenith cable test chips, all but PZt, $29.00. Prepaid orders shipped free. COD's OK. BRAEM, 4928 Aquatic Rd., Card Number Expiration Date Nashville, TN 37211. (615) 331 -9637 voice /fax. No TN sales.

Please Print Name Signature F * 1994 CATALOG OF THE WORLD'S MOST FAMOUS IF YOU USE A BOX NUMBER YOU MUST INCLUDE YOUR PERMANENT ADDRESS AND PHONE NUMBER FOR OUR FILES. ADS SUBMITTED WITHOUT THIS INFORMATION WILL NOT BE ACCEPTED. R CB ANTENNAS & ACCESSORIES CLASSIFIED COMMERCIAL RATE: (for firms or individuals offering commercial products or services) $3.10 per word prepaid (no charge for zip code)...MINIMUM 15 WORDS. 5% discount for same ad in 6 E FIRESTIK ANTENNA in within year; if prepaid (not applicable on credit card - for same ad 12 issues one - issues; 10% discount 2614 E. Adams Phoenix, AZ 85034 orders). NON -COMMERCIAL RATE: (for individuals who want to buy or sell a personal item) $2.50 per word, prepaid.... no minimum. ONLY FIRST WORD AND NAME set in bold caps at no extra charge. E Write or Call, 602 -273 -7151 Additional bold face (not available as all caps) 550 per word additional. Entire ad in boldface, $3.70 per word. TINT SCREEN BEHIND ENTIRE AD: $3.85 per word. TINT SCREEN BEHIND ENTIRE AD PLUS ALL BOLD FACE AD: $4.50 per word. EXPANDED TYPE AD: $4.70 per word prepaid. Entire ad in boldface, $5.60 per word. TINT SCREEN BEHIND ENTIRE EXPANDED TYPE AD: $5.90 per word. TINT SCREEN BEHIND ENTIRE EXPANDED TYPE AD PLUS ALL BOLD FACE AD: $6.80 per word. DISPLAY Frequency ADS: 1" x 2 /a "- $410.00; 2" x 21/2"- $820.00; 3" x 2Ye "- $1230.00. General Information: CONVERTER - descramblers: Examples, rates and prepayment discounts are available. ALL COPY SUBJECT TO PUBLISHERS APPROVAL. Zenith Ztac $225.00, Scientific Atlanta 85XX ADVERTISEMENTS USING P.O. BOX ADDRESS WILL NOT BE ACCEPTED UNTIL ADVERTISER $195.00, 8600 $335.00, Tocom 5503A $210.00, SUPPLIES PUBLISHER WITH PERMANENT ADDRESS AND PHONE NUMBER. Copy to be in our Oak RTC56 $99.00, M35B $45.00. All Pioneer hands on the 1st of the third month preceding the date of the issue. (i.e., March issue copy must be received test generator $160.00. Most makes in stock, Holiday, issue closes on preceding by November 1st). When normal closing date falls on Saturday, Sunday or COD ok. MOUNT HOOD ELECTRONICS, (206) working day. Send for the classified brochure. Circle Number 49 on the Free Information Card. 260 -0107. 91

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www.americanradiohistory.com Be a TV/VCR Repair Specialist Look to the Future you can train for a money -making career as a ow Courteous Service . Discount Prices . Fast Shipping IIITVNCR Repair Specialist. No previous experience 2(lilli21aw Guar necessary. No need to quit your job or school. Everything is explained in easy-to- understand language Cable Converter & Descrambler ! 12 VOLT, 1.9 A/h with plenty of drawings, diagrams and photos. We RECHARGEABLE show you how to troubleshoot and repair video cassette recorders and TV sets. Send for free facts about the GEL CELL BATTERY exciting opportunities in TVNCR Repair and find out how you can start making money in this great career. 1- 800 -228 -7404 Maintenance free, excellent MAIL COUPON TODAY OR CALL TOLL FREE: back -up power source for alarms, communications 1- 800 -595 -5505 Ext. 4249 °s equipment, lighting or CALL ANYTIME -24 hours a day, 7 days a week. Y computers. Can be used in any position SCHOOL OF NNCR REPAIR, Dept. ADE064S and can be trickle 925 Oak Street, Scranton, PA 18515 charged for long Please send me full information and color brochure on how I can learn periods of time. TV/VCR Repair at home in my spare time. I understand there is no Gbh- ;aeon and no salesman will visit me. CATS GC -121 Name due Yuasa# NP 1.9-12 or equivalent. Address_ Apl. N ELECTRONICS 7' X 1.33' X 2.36' high. CayState_ Zip 8" each LPhone( I J 3250 Heidi Rd FREE CATALOG Suite 1 Ceder Pork TX 70613 ALL MAJOR 9 Vdc @ 200 ma. BRANDS WALL TRANSFORMER CABLE /SATELLITE UNDETECTABLE cable /satellite descrambler will work on all systems guaranteed! Send $14.95/plans. MYSTICAL EDUCATION & INSTRUCTION SASE /info, $94.95/kit, Three prong PO Box 481, Cooper Station, ELECTRONICS, F.C.C. Commercial General Radiotelephone Ii- grounded plug. New York, NY 10276. cense. Electronics home study. Fast, inexpen- 6 foot long cord sive! "Free" details. COMMAND, D-176, Box terminates 2824, San Francisco, CA 94126. to three, color -coded 8 volumes com- ELECTRONIC engineering. pigtail leads. BUSINESS OPPORTUNITIES plete. $109.95. No prior knowledge required. Free brochure. BANNER TECHNICAL BOOKS, 1203 MAKE $75,000.00 to $250,000.00 yearly. Learn CATS DCTX -9200 IBM monitors repairs. (solutions most brands). Grant Avenue, Rockford, IL 61103. New home based business program. Software What they are. How they 100 for $180.00 cash PC Power supplies. available. Information: USA -Canada $3.00 work. Safe and easy low voltage test and repair. 96 wanted worldwide ($35.00) (no checks), dealers 37 illus. $19.95. WELX TECH, Box 34, PO Box 2168 R, pages, US funds. RANDALL DISPLAY, Greenbelt, MD 20768. Van Nuys, CA 91404 USA. VACUUM FLUORESCENT "VIDEO Game Secrets of the Orient" Genesis/ pay! Assemble products at - EASY work! Excellent Super-Nint, etc..How in Asia they spend $1.00 for DISPLAY home. 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DAVISON AND AS- small consumer electronics service business, at FREE invention package: Bright green 5 mm X 3.5 mm characters in 5 X 7 dot home. Detailed information $49.95. TECHNICAL SOCIATES offers customized development, matrix format. On board CPU, driver and DC -DC con- and WORLD, PO Box 8207, Philadelphia, PA 19101. patenting, and licensing for new products verter simplifies hook -up and interfacing. Operates on ideas. Proven results: 1 (800) 677 -6382. 5 Vdc. Displays 215 different characters including al- HIGH profits. "Intruder ID ". Home /business phanumeric and other symbols. ASCII configuration. professional alarm system. Complete protection. Module overall dimensions: 6.1' X 1.7' X 0.7' thick. takes a picture of intruder. Your cost Also These displays were modified somewhat from original noyothing else to buy you $148.00 complete - specifications but as far as we can tell they function as Very installation. C sell yy- the original would. We supply a data/ hook -up sheet PO Box9 901.(514) for the pre -modified device which, hopefully. provides 522 -2158. Be a computer most of the information necessary to use the display. CAT I VFM -2 repair expert! $12N each Professional -level home CABLE TV TURN -ON CHIPS study. Learn PC repairs, ORDER TOLL FREE SUPER Cable TV "Test Chips ". Provides full troubleshooting, upgrading, & il- 1- 800 -826 -5432 service activation. Excellent; instructions servicing, installation. Open CHARGE ORDERS to visa, MasterCard or Discover lustrations. Jerrold Starcom: your own business; be a DP(V)5..DP(V)7..DPBB7. Pioneer: BA -5000 thru rERMS M,Mmum atar SI0 CO Si pr rq and handmq log Ina 4a continental more valuable employee. A. Sa CO ora., AA ornara md,a,q AK. NI. PR of Canada mut pay hi BA -6700. Scientific Atlanta: 8500 thru 8600. u s pa, Free career literature. a,oewo AA ofdafa wI,,wa] ,n CALIFORNIA must ac da local stale taba W. Tocom: 5503- VIP..5507. Zenith: ST-1000 thru ouanaliaa Lmtad. 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Wm I I m m m j send $2.00 postage ,.CIRCLE 107 ON FREE INFORMATION CARD www.americanradiohistory.com CABLE TV ADVERTISING INDEX Gernsback Publications, Inc. 500 -B Bi -County Blvd. DESCRAMBLERS Electronics Now does not assume any Farmingdale, NY 11735 Best Prices in the U.S.A.! responsibility for errors that may appear 1 -(516) 293 -3000 Guaranteed to Work! in the index below. Larry Steckler, EHF /CET President QUANTITY DISCOUNTS Free Information Number Page Christina Estrada assistant to the President 197 All Electronics 93 For Advertising ONLY 108 AMC Sales 12 516 -293 -3000 Fax 1- 516-293 -3115 Amazing Concepts 21 JERROLD PANASONIC SCIENTIFIC ATLANTA PIONEER Larry Steckler - CLAGGK Video 21 The Newest & the Latest publisher Cleveland Inst. of Electronics 15 DMTB -A - all Jerrold Impulse 8 Arline Fishman Starcom series advertising director SA3 -DFA - all Scientific Atlantas Command Productions 73 Denise Mullen including 8536, 8536 +, advertising assistant 8580, Drop -field 58 Cook's Institute 75 PN -3A - all Pioneer systems Kelly Twist ALSO 127 Deco Industries 79 credit manager FTB3, SA3, TZPC145G Subscriber Customer Service FAST SHIPMENTS EIA 10 30 DAY MONEY BACK GUARANTEE 1 -800- 288 -0652 FREE CATALOG & INFORMATION Electronics Book Club 44 Order Entry for New Subscribers 1- 800 -772 -6244 1 -800- 999 -7139 N1-F: 9 -6 EST Electronic Tech Today 70 U.S. Cable TV, Inc. Dept.: KEN074 7:00 AM - 6:00 PM M -F MST 1100 N. Paverhne Rd. Bldg. F4 Pompano Beach FL 33073 NO FLORIDA SALES! 121 Fluke Corporation CV2

CIRCLE 112 ON FREE INFORMATION CARD 122 Global Specialties 17 ADVERTISING SALES OFFICES Grantham College 18 e 1aa ttectrunicx e ICS Computer' ì-aining 77 EAST /SOUTHEAST . -.. 4h.,. .: .- v Stanley Levitan 61 =-- } -- 184 Intelligence Incorporated 79 Eastern Advertising b n ,..r, Y, ,+n, pnnn ga 1 Overlook Ave. 126 Interactive Image Technologies .. 9 Great Neck, NY 11021 1- 516 -487 -9357

ISCET 94 Fax 1 -516- 487 -8402 - :..: :.:.:.:::....:::::... ,;;,;;:. VA' ;uï: MIDWEST/Texas/Arkansas/Okla. 179,180 Mini -Circuits I CV4 Ralph Bergen Midwest Advertising Your Ticket To 117 Mouser Electronics 73 One Northfield Plaza, Suite 300 Northfield, IL 60093 -1214 sy NRI Schools 27 1- 708 -446 -1444 .) %i(i1:IL Fax 1- 708 -559 -0562 Parallax CV3 Over 28,000 technicians have gained admit- PACIFIC tance worldwide as certified professionals. COAST Let your ticket start opening doors for you. 182 T.H.O.T.Inc. 79 Blake Murphy Pacific ISCET offers Journeyman certification in Advertising Consumer Electronics, Industrial, Medical, Tab Books 5 Hutch Looney Assoc. Inc. Communications, Radar, Computer and 1800 North Highland Avenue Video. For more information, contact the 92 Tektronix, Suite 717 International Society of Certified Electro- Inc. 11 nics Technicians, 2708 West Berry Street. Hollywood, CA 90028 Fort Worth, TX 76109; (817) 921 -9101. 123 Test Probes, Inc. 1- 213- 462 -2700 Name FAX 1- 213 -463 -0544 Address 181 Toroid Corp. 81 Electronic Shopper City Joe Shere 183 Visual Communications 85 State Zip National Representative P.O. Box 169 Send material about ISCET and World College 7 becoming certified. Idyllwild, CA 92549 1- 909 -659 -9743 Send one "Study Guide for the 94 112 Zentek Corp. Associate Level CET Test." En- 94 Fax 1-909 -659 -2469 closed is $10 (inc. postage/. J www.americanradiohistory.com Electronic SUPPLEMENT TO ELECTRONICS NOW JULY 1994 111,771/fra)/12) /if?".

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www.americanradiohistory.com SPY ON THE EARTH ADVERTISING INDEX Electronics Now does not assume any responsibility for errors that may appear in the Index below.

to " . ,. ! Free Information Number Page Free Information Number Page 211 Accord 176 Information Unlimited 133 284 Accurite lèchnologies Inc 128 Innovative Electronics 132 212 Ace Communications 159 Intronics, Inc. 162 Active Micro 170 168 Island LogiX Inc. 127 213 Alfa Electronics 148 301 ITC Instruments 99 See live on your PC 214 All Electronics 138 what satellites in ITC Microcomponents 164 orbit see Allen Engineering 132 J &M Microtek, Inc 162 282 Capture live breathtaking images of the Alltech Electronics 117 296 JP Video 122 Earth for fun or profit. Zoom in up to 20X. 215 Alltronics 173 170 Kasco Distributing 156 Send $39 check or M.O. ($45 air, $50 AlphaLab 134 249 Kelvin Electronics 115 outside U.S.) for our fantastic software AM Research 126 Lamantia Products 144 package of ofessional quality copyrighted AmRam 102 M &G Electronics l58 programs, (IBM type) that does satellite Andromeda 154 302 M.D. Electronics (Everquest) . 171 tracking, image acquisition, image 316 Angle Technology 163 303 Mark V Electronics 116 processing, 3 -D projections and more. 285 ATC Computers 97 Schematics included for interface. 175 MCM Electronics 157 217 B &S Sales 113 Mental Automation 146 Complete systems available 289 Basic Electrical Supply 132 Merrimack Valley Systems.... 170 as low as $399 (limited time only) 290 Beige Bag 161 304 Micro 2000 123 315 Bel -Merit 155 305 Micro Code Eng 103 For FREE information log on to our bulletin 219 BG Micro 106 Micro Video Products 172 board with your MODEM at (718) 740 -3911. 167 Billabong Electronics 169 170 Information by mail 95.00 (indudes demo disk). MicroTHinc 173 C &L Electronics 121 Call (718) 468 -2720, to place an order. Buy with Midwest Laser Products 170 291 C &S confidence. We've been in business since 1956. Sales, Inc 130 Monto-tronics Inc. 162 Cable Warehouse 170 Motron Electronics 170 VANGUARD Electronic Labs Cable Warehouse 160 Mouser Electronics 150 Dept. EN, 196 -23 Jamaica Ave. 292 Caig Labs 100 National Cable Brokers 160 Hollis, NY 11423 Capital Electronics 134 257 Needham Electronics 140 293 Cellular Link 134 258 New Sensor Corp. 145 172 Chase Scientific Co. l 1 I 306 Oatley Electronics 105 294 Circuit Specialists 124 260 Ocean State Electronics 141 CMH Software 171 Ohio Automation 152 Command Productions 152 Paladin Electronics 98 Communication Specialists ... 102 262 Parts Express Inc 118 295 Compu Video Products (VIZ) . 146 PC Boards 164 226 Consumertronics 154 307 Prairie Digital 146 228 Cool Amp Conducto Lube .... 108 Premium Parts Plus 163 234 Dalbani Electronics 101 RC Distributing Co 158 235 Danbar Sales 153 308 Resources Unitd 142 236 Davilyn Corp. 120 Roger's Systems Specialist .... 102 232 DC Electronics 110 269 Sescom Inc. 102 230 Knight Patrol ®II Debco Electronics 112 309 Sescom Inc. 142 Demosource I 30 270 Skyvision Inc. 109 Talking Security System Design Computation 140 283 Spi Semiconductor 126 A high -end alarm at an affordable price! 297 ECSE Corp 137 310 Sun Equipment 143 Stops burglars before they break -in by verbally Electronic Brokers Inc. 174 Team America 160 warning them away. 241 Electronic Goldmine 129 TECHMART 164 High quality female voice with 220 word vocabulary. 242 Electronic Rainbow 114 274 TECI 156 RS-232 port connects to any IBM PC compatible for 286 complete customizing and status (software included). Electronic Security Prods 172 Tektronix Inc. Corp. 160 24 zones monitor sensors inside and outside plus an Emac Inc. 142 Teleview Dist. 126 auxilliary alarm and supervised fire zone. Fair Radio 156 Test Equipment Sales 152 Automatically switches intercom speakers to alarm. Forest Electronics 144 Thinking Software 128 asio 12 Amp. relays for sirens and control functions. Fotronics 140 U.S. Cyberlab 158 Complete alarm status from keypad, PC, or verbally. 243 Gateway Electronics 127 277 United Electronic Supply 144 rn Speakers announce location of prowlers. 298 Gateway Products 136 Universal Electronics, Inc..... 150 Genoa Alert /Sleep monitoring modes. r Group 152 Vanguard Electronics Labs .... 98 Alpha- numeric LCD keypad. f Geo -Ban Engineering 136 311 Visitect Inc. 150 i 299 Multiple user alarm codes. . w Graymark International 167 312 Weka Publishing 147 Continuous power monitoring. Greenleaf 128 313 Western Test Systems 151 Expandable and MORE! 174 H &R Company 135 314 Windward Products 104 169 Halcyon Group 167 WPT 2 "Stadia electronics Publications 154 300 Highlander (Gault) 107 281 Xandi Electronics 161 19425 -B Soledad Cyn. Rd. s:J rA Suite 333 RES Howard Electronics 162 171 Z -Mann Cable Supply 122 Country, CA 91351 IC Engineering 158 (261.8725 Dealer enquiries Invited.

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www.americanradiohistory.com * * r ALL * * * * * * * * * * * * FIBRE OPTIC TUBES * UNIVERSAL SOLAR ANY PRICES * * SHIPPING OF CHARGER KIT COST FOR ARE IN TOTAL THE FOLLOWING S U.S. DOLLARS ONE, MAIL IS $1 (ITEM S BY AIR IR "TANK SET" FOUR CHANNEL FM TRANSMITTER UHF REMOTE KIT - MKII CONTROL KIT * /. *1 * ßa.,1 * 1 Óf _LYc * These US made tubes are * from equipment, in * ' * "pulls" Q excellent condition. Have 25/ * * Two 6" x 6" amorphous glass * 40mm diameter, fibre- * solar panels, and a KB and all * optically coupled input and * kit for a * output windows. The 25mm on -board components inverter. In normal 1 tube has an overall diameter solid state This low cost FM transmitter * of 57mm and is 60mm long. sunlight, the combination can features pre -emphasis, high ON SPECIAL is a set of * The 40mm tube has an * deliver a charging power of Features a 3 channel transmitter audio sensitivity as it can easily components that can be used to * overall diameter of 80mm over 1.4 Watts into 5 -12V which is small enough to fit onto up normal conversation in o make a very responsive Infra * and is 92mm long. The gain * batteries. EG 6V- 230mA, 9V- is that they a key ring. The fourth channel lpickarge room, o ronge of well over Red night viewer. The matching * of these such * I50mA, 12V- 120mA. The glass It has would produce a good image * con be accessed by a second 100 meters, etc. also lens tube and eyepiece sets were * panels need to be terminated excellent frequency stability. working military * in approximately 'I, moon * transmitter. For example each of removed from and have their rear the two transmitters have Specifications. Tuning range: 88- quality tank viewers. We also * illumination when used with * could waterproofed. Simple to do, two common channels and one 108MHz, Supply voltage 6-12V, supply a very small EHT power * suitable "fast" lens, but they * instructions included. individual channel. The compact current comsumption ® 9V: supply kit that enables the tube * can also be IR assisted to see * receiver employs a ready made 3 5mA, Pre -emphosis: 75µS, to be operated from a small 9V * in total darkness. The superior * and prealigned (304MHz) UHF Frequency response: 40Hz to battery. The tube employed is resolution of these tubes would $20 than 15KHz, S/N ratio: IR make them suitable for low * receiver "front end" module. greater probably the most sensitive * For the two panels, PCB and than 60dB, Sensitivity light video preamplifiers, wild * Over 100 meters ronge, has Greater responsive tube we ever * components, terminating clips for full deviation: 20mV, viewer * life observation, and 12A SPDT relay contact outputs, supplied. The resultant and the instructions. INCREDIBLE has a user progrommoble Frequency stability with extreme requires low level IR illumination. * astronomical use. * security code with 6561 antenna movements: 0.03%, Basic instructions provided * PRICES: Each of the tubes is * combinations, easy to construct, P.C.B. dimensions: 1" x 1.7 ". * supplied with a 9V -EHT * INCREDIBLE IMAGE is expandable, etc Transmitter: Construction is easy and no coil $85 * power supply kit. * $13. Receiver: 546. TWO winding is necessary. The coil is * PRICES: * INTENSIFIER TUBE For the tube, lens, eyepiece and TRANSMITTERS AND preassembled in a shielded AND SUPPLY the power supply kit. When For the 25mm ONE RECEIVER: metal can. The double sided, * $85 $68V ordering specify preference for a The operating of the solder masked and screened KB * intensifier tube and supply. frequency wide angle, or a telescopic system is adjustable but you also makes for easy construction. objective lens. For the 40mm should check local regulations The kit includes o PCB and all * $130 * with regards to using this very the on -board components, an * intensifier tube and supply. * and a 9V low power remote control system. electret microphone, * Three of these tubes can be battery clip. MIRACLE TV cascaded to make a very ANTENNA KIT * FM TRANSMITTER * high gain image intensifier! $8 * We should have a kit and * MK1 KIT * instructions available to make * * these. Approximately $195 * PASSIVE NIGHT * for 25mm and $320 for VIEWER * 40mm, three stage kits. * * Resellers enquiries welcome. * * * * * These are the key components * * * * * * * * ** needed for making a PASSIVE This unit has most of the proven This combination of NIGHT VIEWER. The small features of our FMTXMK2 circular antenna design, and a MISCELLANEOUS ITEMS prefocussed Russian image transmitter, but is much smaller. wideband low noise amplifier COMPONENTS AND KITS intensifier tube only requires o The complete transmitter PCB produces remarkable results on power (Miniature microphone included) High Voltage Diodes 5KV-3rnA, low current EHT supply to VHF, UHF, and FM frequencies. make it operational, which we is the size of a "AA" battery, $0.80, 10KV -20mA, $1.40 Based on an IC with 20dB of provide in kit form. Draws and is powered by a single High Voltage Disc Ceramics: gain, a bandwidth of 2GHz and 20mA from a small 9V battery. "AA' battery. We use a two 0.01uF -3KV, $0.80; 0.01uF -5KV be With a suitable low light "AA" battery holder (provided) a noise figure of 3dB. Can $1.30, 1000p'F 15KV, $3.50 used as a masthead amplifier objective lens (not provided) the for the case, and a battery clip Electric Fence Kit PCB and This is a completed commercial on existing antennas The cost resultant viewer will produce (shorted) for the switch. components, $28. Geroge-Door monocular hand held night of ports for useful pictures in sub -moonlight Estimated battery life is over of the complete kit Remote Control Kit Tx $13; Gate it can also be hours,' AS viewer, that employs an image the masthead PCB and illumination, and 500 SAME PRICE amplifier RX Laser Beam Communica- $56 IR INCREDIBLE PRICE: OUR FMTXMK2: intensifier tube. The viewer is of components, the power and assisted. tion Kit TX, RX, plus IR Loser, $39. a USSR military standard signal combiner PCB and Boll (model T3C -2), and will produce Plasma Kit KB and com- $8 components, a bolun core and $105 useful images in very low ponents kit, needs any bulb $18 the tinplate for the antenna is for the Russian image intensifier ambient light. Has adjustable IEC Extension Leads: 2 meters long priced at only tube and an EHT power supply low light objective lens, $3.50. High Intensity Led's: 550 - kit! All that is needed to make a adjustable eyepiece, and is I000mCD output at 20mA, 5mm SOLID STATE complete passive night viewer is supplied with a carry case. $18 diameter, 10 for $2.80. "PELTIER EFFECT" a lens, an eyepiece, a 9V Requires a DC supply (Plugpock Triocs: 60A -600V Stud mounted COOLER - HEATER battery, o case and a switch. $280 etc.) 7V -20V DC at THOMPSON type TGAI606 $7.20. We con supply a matching lens These the major parts approximately 25mA. Extra Ultrasonic Transducers: Murata ore and eyepiece: reinforcement for the tinplate brand (Japanese), 40KHz TX-Rx needed to make o solid state pair. RED FILTER antenna is also required. Pair, $1.50 $68 for the thermoelectric cooler - heater. INFRA We can provide a large 12V- A very high quality IR filter and 4.5A Peltier effect a RUBBER lens cover that would All our kits are provided with high quality fibreglass, silk screened and solder masked, printed circuit boards semiconductor, two thermal cut- fit over most torches including out switches, and a 12V DC fan MAGUTES, and convert them to for a total price of a good source of IR. The filter material withstands high temp- OATLEY ELECTRONICS eratures and produces an output 5 LANSDOWNE PDE., OATLEY, SYDNEY, NSW, AUSTRALIA 2223 $32 which would not be visible from We include o basic diagram - a few meters away and in total FAX ORDERS circuit showing how to make a darkness. Suitable for use with PHONE ORDERS small refrigerator - heater. The passive and active viewers. East Coast between 7 pm and 2 am 011 61 2 570 7910 major required West Coast between 4 pm and 11 pm additional items with will be an insulated container Mastercard - Visacard $11 011 61 2 579 4985 Telephone or Fax Orders such as on old portable cooler. the lens Two heotsinks, and a small For the filter and rubber International Bank Drafts and Money Orders with Mail Orders block of aluminium. cover If possible include contact phone and fax number

CIRCLE 306 ON FREE INFORMATION CARD 105

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Satellite . Analysis and C-BAND SYSTEM Antenna Package INCLUDES all of this: Aiming 711 ORBITRON mesh dish Software uniden 4400 IRD Polar tracking mount and An extremely valuable tool for designing and motorized arm for of use by installing NRO's, tailored ease Chaparral Polarity switching feed professionals and dealers as well as by technically LNB orientated NRO owners. Demonstrates how Pico dish 25 °Low Temperature changing parameters such as dish size or LNB Tuning 100ft All in one ribbon cable Meter noise temperature affect picture quality. The Optional Decoder module program performs both NRO system analysis and antenna aiming. The analysis subcomponent, is Butz -I- Tuning especially useful for predicting performance when Meter 'Al you "«d to supply viewing signals from a particularly weak satellite. Now with N groundnd pd b mount System The aiming subcomponent calculates azimuth and audio alert a,sool Only $859 elevation angles and range to all satellites within "view" of a NRO. The names and latitudes of all world -wide C and Ku -band broadcast satellites, TUNE YOUR DISH presently in service or to be launched by 1995, are LNBs listed. The user simply enters NRO site latitude TO IT'S MAXIMUM! New Lower and longitude. 5.25' disk $49.95 Temp's meters a must for the 3.5' disk $49.95 Dish tuning are serious dealer or satellite system owner. Saves time, Hemt Technology Commercial Grade frustration and money. Use when installing a new SATELLITE SYSTEM system, moving your dish, re- alignment of a dish DO-IT- YOURSELF that has been moved by wind, frost heaves etc., 35° LNB C band 4GHz s 79 belt for the best 25' LNB 95 INSTALLATION VIDEO gets you right on the satellite possible picturesl Wow You Can Watch It Being Done" 0.9dbLNB Ku-band 12GHz $ 89 0.7dbLNB " 99 Install or 'Tune up" your satellite system in no Pico meter (meter tuning) 689.95 0.6dbLNB " 119 time flat with this professional video. Butz -I -IV meter (meter & audio alert) 154.95 VHS or Beta (45 Min.) $33.95 All Major Credit Cards Accepted Skyvision Inc.® MESH DISHES Toll Free 800 -334 -6455 by ORBITRON 1046 Frontier Drive, Fergus Falls, MN 56537 - Catalogs Buyers Mail in coupon or call today for the SKYVISION Satellite TV Product Quality Delivered free to your mail box in U.S. and its possessions. Demonstrated Guide by Performance Send Free Domestic Satellite TV Products Catalog

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A grea pro - o en ance your bench. This handy little function generator has a built -in buffer amplifier, a 3-decade range WITH TEC -200 FILM selector switch that covers 15 hZ to 25 khZ, output level control and function switch to select sine, square, or triangle. JUST 3 EASY STEPS: Copy circuit pattern on TEC -200 film using any plain paper copier Iron film on to copper clad board MORE KITS Peel off film and etch convenient 814 POWER SUPPLY KIT 3 DIGIT LED DVM ONLY 3" X 3" READS 0 TO x II size With Complete Instructions PS-1 $16.99 100 V DC ORDER DVM3 $19.95 utput of this power supply is con - FM WIRELESS BROADCASTER FMI $ 9.95 ORDER TEC200-10 (10-SHEETS) $5.95 usly adjustable from 1.2 to 25V 8038 FUNCTION GEN. KIT FGI $ 9.50 . The LM317T voltage regulator SEQUENCER PROJECT SEQKIT $ 9.50 rovides excellent regulation and CHRISTMAS TREE PROJECT pie rejection. Includes a 1 A Build this unique seasonal project and have UNIVERSAL DECODER IC'S nsformer, PC board, LM317T, 2 an unusual converstlon piece. Powered by REFER TO RADIO ELECTRONICS MAY 1990 finding posts, and all small parts. two D cells, 17 LEDs flash In a seemingly ran- CD22402E 7.95 CD4040 .65 dom fashon. Kit Includes everything except LM733 .99 CD4053 .59 batteries. ORDER XMASKIT $18.95 LM7805 .50 LM7812 .50 CA3126E 1.95 LM7905 .50 74C00 .50 3.58 MHz 1.00 DC ELECTRONICS NE564 2.29 18 Uh 39 SEND MAIL ORDERS TO: PO BOX 3203 SCOTTSDALE, AZ 85271 ADD $4.00 S &H 110 CIRCLE 232 ON FREE INFORMATION CARD

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CHASE SCIENTIFIC STANDARD FEATURES INTRODUCES 2 NEW - Up to 40 Megasamples /second One -Shot Digitizing Rate SCOPES FOR 1994 - 32K Words /Channel Standard - 2 or 4 Channel Models Available By Staff Writer - Plot to any Epson or HP LaserJet Compatible Printer Chase Scientific Company has just introduced its new 4- Channel 60 MHz - Built -In Functions Include FFT, Dig. Filtering, Averaging, and 100 MHz PC -Based Digital Storage Voltmeter Emulation, etc. Scopes. These scopes compliment its already existing line of 2- channel scopes - Measures Pulse Width, Rise /Fall Time, Frequency, Harmonic which have useful bandwidths of 20, 40 Distortion, RMS, Peak, Min, Max, etc. 60, and 100 MHz. Each ChaseScope' System is completely self-contained on a - Store and Retrieve Waveforms and Setups to Hard Disk single midsize add -on board (2 required - Professional Scope Software works with VGA, EGA, CGA, for 4 channel version), at prices that will make the competition cry. Just plug in or Hercules compatible monitors. the board(s), attach your scope probes, load the free software and you're on your way. These boards have completely independent vertical channels, each with UERTICAL HORIZONTAL OM' IRIGGER :URSORS STORE PR1RT A TUP their own 25 or 40 megasample /sec Measure Uolteeter Probes IiItors Fourier Macros Nag 01 her 8 -bit A/D converter, 32K static ram, and 10 vertical gain settings (in 1,2,5 steps). CHI OFF RUE B TRIG LUL - HI U Apr ,1599 This gives you the same high CHZ - OFF SON - B. fir Trig;ered 85:99: 9 PM performance whether you are using one BOTH - OFF channel or multiple channels simultaneously. Also, in addition to 27 OS1 - .B B timebase settings (in 1,2,5 steps), there 02 . +8.0 iiinetilag,==iWialtaig is a user programmable mode for i..... 1 sweeps as slow as 1 month /division. i eeou Post and Pre - triggering are i .ENH . B co e . available for time reconstructed Er5 =2 waveforms as well as one -shot due to ePTS- 512 iEM, the board's unique ability to use random UECTOA- ON ...... 4r717. . ... interleaved sampling. t .. These PC based scopes are OURLAY -OFF I designed with the latest in Surface In nt I i Mount Technology, providing better M ig2tji performance, reliability, and features Expand- lx than any other board its size on the Scroll BEN Recon. ructl n market today. Chase Scientific also - i 1 SB ins tot SBns Flu offers an unprecedented 60 day money

back guarantee. F1 - MenuHelp < To Change Header Row Press 'INS" > ESC - EXIT

COMPARISON CHART OF PC- OSCILLOSCOPES

MODEL # CS100 -40A CS60 -40A CS40 -25A CS20 -25A CS100 -40B CS60 -40B

Price (probes not Incl.) $1195 $995 $795 $595 $1895 $1595

Number of Channels 2 chan 2 chan 2 chan 2 chan 4 chan (NEW!) 4 chan (NEW!) Bandwidth Repetative ( -3db) 100 MHz 60 MHz 40 MHz 20 MHz 100 MHz 60 MHz Single -Shot (sample rate /4) 10 MHz 10 MHz 6.2 MHz 6.2 MHz 10 MHz 10 MHz Maximum Digitizing Rate (two channel simultaneous) 40 Ms/sec 40 Ms/sec 25 Ms /sec 25 Ms/sec 40 Ms/sec 40 Ms/sec Time Base Range 5ns-2sec/div 5ns-2sec/div 5ns -2sec/div 5ns-2sec/div 5ns-2sec/div 5ns-2sec/div Maximimum Time Resolution 1ns 1ns 4 ns 4ns 1ns 1ns Vertical Resolution 8-bit 8-bit 8 -bit 8-bit 8-bit 8-bit Vertical Sensitivity 5mV-5V/div 5mV-5v/div 10mV -10V/div 10mV-10V/div 5mV-5V/div 5mV-5V/div Memory Depth 32K 32K 32K 32K 32K 32K

FOR FREE INFO & DEMO DISK CALL 1- 800 -866 -7899, FAX 408 -479 -8572 OR WRITE TO CHASE SCIENTIFIC, 7960 -B SOQUEL DRIVE, SUITE 191. APTOS. CA 95003 111

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74191 129 741S163 74xx ----.55 39 74E245 74HC151--- 129 194555C .69 CA3096 - 1.69 2732A 425 ]7BLA1 .45 41426 74195 741S164 ----.59 74S20 Drivers, -- 7400 .40 9 35 .79 74HC157--- .59 XR1.555 - - 10 TCM3105---6.95 2732924.50 .59 74196 74022 7401 .10 9 7415165 ----.69 35 74F253 .79 74HC158---- .49 Op Amps SE555 75 CA3126 ----1.45 27032 4.50 78067 .59 4H28 59 74197 85 741S166 ----.65 74530 35 74E257 .79 7402 .45 74HC161---- .59 D500026-- 2.19 1M556 .59 CA3130---- 89 2764 3.95 79087 .59 41132 .79 74196 1.79 7419169 74532 .40 749258 7403 - -.9 .69 71HC163---- .59 100 L1A558 .79 CA1110--- .79 2761.2 4.50 78107 59 4N33 .79 7419 1.19 741919 74537 1.19 7404 12 ----.9 25 74F259 74HC164 --- .59 NE564 - - 1.79 CA3146 ----1.09 2764.15- -4.95 59 44435 .79 74221 711S170 LM- 7405 .40 ----.69 .35 749260 .69 74HC165---- .69 1.061 1.19 LM565- 199 CA3160 ----1.9 27064 3.50 7815T 59 41137 .79 74246 4.95 741S173 74538 7408 .50 ---.I5 .35 71F273 .89 74HC166- .59 71062 1.19 114566 - CA3161 - 1.99 27061-2 -3.75 7805K 1.79 41415 .89 74247 741S174 74551 7407 .50 ----.19 .40 74E280 .99 74HC171--- .59 1.09 LM567 179 CA3162 ----8.00 27064 -15 195 1.79 1L0-71 295 74248 4 95 7410175 35 749283 -- 1.79 74HC175---- 108 .50 .15 - .59 0Á6 NE570 ---- 2.99 CA3183 -- 19 27128 4.75 781514 1.79 111111 1.00 74249 4.95 7115181 1.69 74565 7409 .55 -- 50 74F29 -. - 450 71HC191---- .89 11071 NE571 - - - 2.09 27128Á2 - 5.00 781405 59 111.113 1.00 74251 711519 74571 7410 .35 ---3.95 .35 749350 --V- 229 71HC192--- .89 .75 MC3340----169 27128A -15 - 790 .59 611136 225 74259 1.79 7419190 74585 7411 .55 ---.59 74F367 .99 74HC193-- .79 ÑEE592 2.45 MC3316--1.9 27C128 - -- -5.00 78112 .59 611137 2.50 74265 1.09 7413191 74586 -.59 25 74F373 .69 71HC191---- .79 7L81 1.065 NE602 - - 1.95 27CÌ28.150.5.50 59 111139 1.19 74273 2.95 7419192 745112 .55 74F374 .69 71413 .40 .79 71HC19---- 19 11.012 .65 MAX663--- 3.9 MC3373-109 27256 1.95 78924 .59 69419 1.79 74276 1.39 7419193 7ÌS113- - 1.19 7414 .40 ----.69 749377 - 71HC221--- 99 11.983 1.09 MAX666-- 189 CA3401 ----1.50 272562 - - 5.50 59 MCA256 - 1.09 74278 2.19 711S194 - - - 69 740114 .59 74E381. 7414C237---- 7418 .40 419 .79 11.064 1.09 MAX690-- 3.49 2725615 -- -5.75 77954400 195 HA113721 ---.69 7479 711S195 74S124 129 7417 .40 -.69 74F39 159 74HC238---- 99 121 . 495 MAX690--- 5.9 27256170 - 5.75 MOC3010 -- 1.19 74283 95 7419196 ----.59 7ÌS132 129 71HC210---- .69 7420 .40 35 749521..- 114207 50 MAX691-- 5.99 MC3470---129 270256 - -4.95 1.40W011 129 74284 2.95 7119197 ----.59 715133 74F533 - - 74HC241---- Nnative 7422 .51 .30 -- 229 69 164209 .50 1IAX692--- 6.50 MC3479----129 27025625.50 MOC3020 -- 139 74285 7113221 74HC242---- 7423 .54 .69 74F57í - 299 99 56215 1.50 MAX691--- 8.50 MC3489----915 27025615- -5.95 M0C3021 -- 1.49 2.99 7113221 -- 1295 71S135- .15 749574 744C213---- 79112 45 7425 .50 2.99 89 MAX231--- 2.9 MAX695--- 6.50 MC1186---199 270256100 - 6.95 4P3700--225 74293 1.99 7113210.59 71S136---.10 749623 - 1.59 74HC241---- 79 79115 .45 7426 .40 - 94X232 - 2.79 27512 6.00 7429 79 7415241 ----.65 715139- .40 749646 - 495 74HC245--- .79 79957 .59 7427 .40 - 602233 6.50 L71090 .Ó 503524 --1.79 27512-20 - -8.50 74351 259 7410242 74$140 74HC251--- .59 Transistors 7428 .56 ----.69 .55 .59 MAX238 6.50 1711 1M3900---- .69 27C512 6.00 74365 .69 7415243 74S151 71HC253---- 71381 .59 NSDU01----25 7430 .69 .35 74Cxx 39 LM301 .49 LM723 59 1.M3905 --- 19 27C512.15 - 6.95 7115244 718153 .35 71HC257--- .59 7910T 54PSL102 - 25 .50 -.69 74000 45 1.M723H-- 129 193909 ----1.19 27C101 -200 - 795 74367 49 7415245 ----.75 74S157 .55 7912T .59 MPS905--20 7433 56 74HC258- .69 LM307H - - - .49 1143911 27CÌ01.100.9.95 711$247 ----.79 745158-----1.00 714C259---- 1.9 .59 7437 35 74004 .40 89 LM308 75 133 ... 5.69 1943914 ----2.69 270201150 10.95 74368 169 7415248 74S161 1.00 74HC273--- 29 LM711 .10 79910551T4 1.79 VN10 1.95 7438 ---.9 74006 .40 1.11309H 425 1113915 ----2.69 27C201-100 13.95 74390 139 7115219129 71S162 2.95 71HC280---- 7912K 1.79 M1452-13 25 7439 2 .92 1M309K - - - 2.09 1.09 1943916 ----2.69 270401 -150 19.95 74393 1.09 7115251 ---.59 71S163 .50 70HC29- - 7975 1.79 MPSA20 30 7440 .35 74C1Ì 19 LM310 - - - - 189 LM747 MC/001-1.00 27C401. 100 29.55 74425 169 7410253 74S16.6 .69 .59 T1P29 50 7442 .55 ---.59 74HC367- --- .69 111311 A9 1.11748 69 M4016--2.75 74426 711.5256 1.90 .45 719C368---- .69 1M1011 79M08 99 7443 9 741339. 11431111 - - - 99 --- 269 MG024 ----279 74490 4 95 7113257 715176 .45 EEPROM 792412 .59 ñr31 .50 124 -.15 .35 71HC373---- 69 11431211 --- 5.50 S01027 - - - 6.9 7415258 74S181 2.00 71HC374---- .69 2816.150--3.75 792415 .59 11P32 .50 7445 9 .55 7442 2.09 114116 - - - - 1.00 MAX1232-- 329 M4136----1.19 7415259 745162 1.09 2816250 425 792421 .59 7446 74LSxx --.69 74HC396 --- .59 1.11317K - - - 2.09 1141303 - - - 1.69 RC1136-1.09 1.35 74046 2.95 2816150--1.50 7924K .59 71931 7Ó 7415260 ----.59 715188----1.9 711C39---- 69 1M317T - - - - .19 1141310 --- 1.39 RC1151 ----1.09 7447 741500 .30 74073 - 129 79247 1.79 7415261 --1.9 -- 74HC540- - 1.09 LÁ1317 69 MC1330--- 1.69 RCI558---- 79 29016150--3.95 449 289 741901 .15 74C74 1.09 2861250 7.95 71942 55 711$266 -./5 745191 1 55 74HC541---- 89 T1.317IT0921- .70 MC1319--- 2.09 M4711---- .50 741502 30 74C76 1.09 2BCb1-250 739 71918 89 7115273 -.79 7/5196 .55 74HC573---- 89 LM3166 135 MC1350---- 19 NE5205-2.39 PAL 7451 .35 741.503 30 74095. 159 28C64-150 - 7.95 7415275 - - - 2.19 743197 .69 74HC574---- 89 194319 MC1358- .9 NE5532 ---1.19 7453 .35 741904 30 74086 69 28C256250 27.95 018 2.35 7112279-A5 740201 2.69 71IIC59-- 129 116322 MC1372--- 2.69 M9SA43---.30 741905 .30 74090. - - -- 1.59 1.9 216 2.35 7115290 ----.69 715226----200 741106/0--- 185 MC1374- 2.00 NE5539 280259150 29.95 MP.5A5525 748 50 741506 .55 7ÌC93. -- 1.59 114323K-- 138 ---2.19 6.95 741.5283 --.65 7152100 .79 71HC652--- 1.79 MC1404--- 1.99 MPSA-56 - .35 7470 1.09 741907 .55 71095 1.09 1743231 ICL7106-5.19 6544 2.35 741S290 ----.65 745241 .79 71HC688-- 1.19 MC1405 1.99 IC17107---5.19 MPSA65.15 7472 1.34 741508 10 7/CÌ50 1.95 2:9 Dallas 6R4-10- - 2.95 7410293 ----.65 745244 .69 74HC1017--- 19 LM329 .85 MC1408á- 1.9 IC1.7109----9.95 MPS970---.15 7473 .75 741509 30 710151 2.95 DS1202 -- 4.69 691-12----2.75 7115295 1.09 745251 .59 7/HC/020- 89 111331 5.29 MC1108á-- 1.89 ICM7207----7.95 I147S992.10 7474 49 7ÌC151 - 195 DS1228 - -- -6.49 6R/152.55 7119298 - - .79 715253 89 - 71HC4021-- MC1111 ICM7208- MPSA93-- .40 - .9 64AX333 6.90 1.9 20.00 - 7475 55 741511 35 740157- 1.99 -- DS129 -- -8.00 741529 159 715257 .40 -- 7/910/040 --- .69 1111414 --- ICM7216 .60 7476 .65 741912 710190 1.9 1.M334 199 1.69 25.00 DS1260 -- 15.00 6R6-25---. 235 741$322 1.59 715256 45 7494019 - -- .59 - MCR102 --- 190 - 194335 - 1.59 MC8156--- 1.50 7480 99 741513 .00 740161 89 -- ICM7231----949 DS1287 -15.00 6R610-2.95 741S323 - - - 159 715260 69 74404050 - MCR102 -- 180 -- .59 - - MC1458-- 7482 741514 45 740162. 1.59 19336 - 1.19 .17 ICM7551-- 89 D52Ì3017.00 611620---2.55 7119321 --2.09 715273-----2.19 7ÌH4051 -- 1.29 1111498 IC117 25 609102 .50 7483 219 741515 .40 74C164 1.59 LM337K - - - 159 ---- 50 556- --1./9 7419327 - 1.09 745280 A5 741519 7444060. -- .79 1543371 - - - - 19 194119 - - - - 50 IC17660--1.9 23s .47 7ÌC19 159 SRAM 1 7115348 - - - 1.09 74S293----180 7444075 - -- 49 1.1433844 1.95 MC1496 .9 ICL7663 -325 74496 .55 741520 30 74C174 .89 - ... 61.615---3.19 P 7415352 109 740267 1.99 74H435ó- 1.39 - - - TCM1520 -- 2.69 741521 .34 74C175 19 1M3381 295 139 IC17665---119 7115353 - - 99 745298-----1.79 7ÌH4511 -- 2101 TIP112 .75 7490 2.999 741922 2.19 111339 .55 MC1558--- 2.59 UA78S40---129 285 .34 7115363 229 710192 -- 139 7ÌH4515 -- 5101 2.79 rzs J112 .50 7491 711926 715299--1.19 2/9 1M31014 --- 195 MC1558G-- 259 IC1.8038----3.79 6R615325 .34 740193- --- 1.59 .99 T19120 .59 711$361 1.09 715373 79 7444538 - .79 1M3401 - - - .69 MC1618---- .90 IC18211 ----2.49 49 1.9 711327 .34 710195 1.59 - 6418.20250 1191 7419365 - - - - 45 745371 .79 744022106- 8.95 MC1723CL- 211021 1.9 99 69 711528 15 1.00 1F13711-- 29 20F44 2,65 7115366 ----.15 745381 3.69 7/0221 2.9 MC1733CL- 214 719125 60 7495 711530 .35 740240- 2.09 LF3/7K 280 1.00 LM13080 --1.59 20R6 235 212 1 719127 . 7415367 --./5 745387 1.99 174348 .65 LM1800 - - - 2.69 1M13900 - - .99 95 7496 69 741531 740244. 2.09 20R6-15---2.75 719146 7113368 ---.15 745399-----1.09 74HCTxx 1935014 1.19 161812 725 2117 2.09 199 7497 1.50 741532 19 740373- 2.09 -- 201.8 2.35 9C1480- 17 711S373 - - - - 75 715412 300 74HCT00------LM1930 - - 1.95 74100 4.95 7/LS33 .40 710901 1.9 .30 1M3507 2.9 75107 79 2(18-15----2.95 7115374 - - - - 75 745171 299 7411C702- --.30 1111871 - - 995 75108 .89 6116193--2.79 50 74107 .35 7/1337 .35 740902 - - -- 1.09 201620----2.95 7115375 - - 99 745472 61161.92---325 3N200 5.00 74109 2.99 714C701---- 35 1F353 161872-- 5.95 7110 .89 20418 2.35 39 710903 1.9 - 7415377 - - - - 75 745171 4.95 - 611619-1 329 C203V 1.00 74110 .60 741940 .35 740904 .59 744CT08---- 35 F355 99 1141877 195 75138 269 20X10 4.95 7115378.9 715570---2.95 71HCT10---.35 19356 89 1511881 4.95 75150 129 6264L915 425 tRF353 825 74116 1.69 741542 .4 - - 22V10 6.95 740905 -- 6.95 - - IRF541 7419379 - - - 99 715571 3.00 74HC711-- 40 100 1541889 --- 3.95 129 62641P12 4.50 3.00 74120 1.29 741547 .65 740906 125 22V1015 11.95 7115385 ---2.9 715573-----269 1111896 75154(5 626119.10--1.75 M956513 20 74121 .51 741549 .89 74HCT14.-- 47 ÁC58 129 2291025--- 995 7415386 74C90 .9 626145----3.9 1495918 25 74122 .99 -.55 7111C720-- 35 1M359 299 01.112001 --- .79 75160 3.75 7411390 740939. 195 6261.12----/.19 MJ1tX3 --- 1.50 741551 ----.89 74Fxx 71HCT27---- 35 LM376 ---- 139 01142003 - - - .79 7574 2.39 7415393 ----.79 740911. 12.95 6264-10----1.39 A To D 2N1132 89 741233 55 711551 .34 74F00- 71HCT30--- 49 194260 1.09 U1N2004 -- .79 2.39 7415395 740914. -- 2.69 -- 2061.100 -- 625 ADC0800 25.00 281678 .50 74126 .55 711955 ---.89 74HCT32---- 35 154380Nó-- 1.19 592206 --- 19 75176 2.09 31 7415396 74915 - - -- 2.19 6225619-12 -/.95 ADC0802 7.00 .89 714C738--- 39 1M381 - - - - 195 XR2207 --- 249 75188 .50 74128 .75 711963 .89 is 74C917. 995 62256LP-10 5.50 2SC19t9 7419399 ----.9 7414CT74---- 45 LM382 2.49 592208 - 269 75189 .50 ADC0901--325 25 74132 .55 711573 .45 35 74C921. 6.95 6225619.70 625 190 7410424 ---4.00 74HCT75---- .10 - - - - X112211 - - - 269 AD00009--6.19 LM383 3.69 75365 89 74136 .55 711371 .34 71F160 .35 740922 5.95 2 7419417 --- 1.19 74HCT85--- .89 LM351 2.9 092210 1.69 75150 .99 6281281910 16.95 ADC0809---399 74141 1.55 711575 38 74F11 35 740923. 995 2N22198 7115118 - - - 199 092242 - - - 6281281985 17.95 ADC0818 20.00 .50 74142 2.59 741576 .55 74E14 .35 710925 9.95 74HCT86--- 49 1M385Z 12. 1.95 1.50 7151 741S465 - - - -- ADC0317 17.00 9112222 15 19 - - 74143 5.95 711578 .59 74E29 35 740928- 995 74HCT19- 49 194396N-1--- .69 XR2567 2.50 75452 59 7410493 - - - 199 AD00820 11.00 2N2222 .30 74144 6.95 711983 .59 7/F21 71HC7123 75 1M386/13-- .95 ULN2803 - 1.09 75153 Regulators, 7110534 .47 740929 7.95 ACC0831-3.9 MP02222 1.09 74145741 741185 -1.29 - 74HCT125--- 59 LM386N4 129 182877 2.19 5451 .59 .9 59 7/F30 .47 M192396 30 7115510 ----.9 74HCxx 74HCT132--- .59 1M387 1.89 192878 - - - 995 75477 Adjustable ADC1205 46.00 --- 74147 229 741386 35 7/F32 35 2/02184 .35 7415511 - - - - 99 74HC00---- 30 74HCT138--- .59 - 1M2900 - - - 75491 194150K -495 74148 125 741590 .55 74F37 .47 1M789 119 2.19 -. - 741$573 1.19 71HCO2 .30 71HC7139------.69 75492 193176 -- -2.9 74150 139 74191 .69 74E36 .49 -- 59 1.74390 - - 1.79 LM291 99 D To A - - 2N2995 .50 741.S574 - 1.49 741fC01 .30 1942903 - - - - .9 .79 74151 .49 741092 .65 59 74HCT151 .59 LM391 3.95 .49 75493 DA00900 -- -2.9 7415590 - 193177 .69 1/902907--- 1.9 ---1.9 - 1A12907 30 74HCT151 LM392 129 169 75494 74153 .49 741593 .49 74F64 59 74HC08- 1.9 -- 9 DAC0806 - 119 7115595 515 71HC10 30 74HCT157--- 59 194393 .45 MP02907-- 2.69 MC145026 -1.69 T1.317R092) .70 2142907 74154 1.59 741595 75 .35 DAC0808 --1.89 7115612 ---1.9 74HC11 - LLAA113;1I7MK - 3.59 992907 .15 74155 .59 741096 75 74425 2.9 --- .34 74HCT158--- .59 LM2917 2.19 MC145027 --2.19 0ÁC0830 -- -749 7415620 2.9 74HC14 CA3018 - - - 1513377 .99 Times- -- 1.99 74156 .59 741S10---- 7ÌF86 35 74HC7161--- .79 1F398 9,991 1.50 MC145028 219 DAC1020 -9.49 45 .49 - 21429557 - - - 75 711S623 1.19 74HC20 .30 74HCT163--- 59 CA3037 - - - 1.50 14C145151 --7.95 161360 - -- -4.95 74157 55 741S19 - - - - A8 74E109 65 0ÁC1021 -8.49 283019 .70 7115621 ---2.19 71HC21 ---- .55 71HC1164---.79 - - 3.995 CA3039 - - - 1.9 MC145106 - 229 -- -2.95 741S112 ----.15 74E112 89 LFIM- DÁ01022 -- -6.49 21L15 7415629 ---2.19 7111C27 - - .34 7411CT19--- 79 043046 ---- 89 MC146918 - - 4.19 163387 55 74160 ÌB9 741S113 ----.69 74E125 69 69 7115610 - - - 1.09 7111C30 34 74HC1166--- .79 1F442l1112- 2Á9 CA3059 -- 1.69 1513406 -- -3.95 74161 .59 7415114 ----.15 74E136 69 2143392 35 7113641 1.50 7414C32 30 71HCT173-- .69 CÁ3060 - - 2.95 1.1.43407 .69 OPTO 74162 .89 741S122 ----.57 74E139 .69 EPROM 263393 .35 7415613 - - 128 7411C12 - - - - 55 74HC1171--- CA3065 --- 1.69 2.95 MCT -2 71163 .79 741S123 74E148 1. 59 lF4/Ì 1.99 ----.59 - 2143/17 10 7115645-1.9 74HC51 - - - - .30 74HCT175--- .59 71.489 1.59 CA3080 - - - 90 LM74 5K ... 1:50 74161 .79 741S124 - - - 74E151 2.69 7415646 25126 4. 265168 7115125 ---2.39 7/F153 71HC73 .55 74HCT191-- .69 TL491 C11081 --- 79 HIM 9 --./5 7415668 139 2532 8.9 N3638 30 74166 .89 7419128----./5 74E157 79 7414C71 .10 74HCT193- .79 TL496 1.59 CA3082 --- 1.9 Positive 7419669 74HCT194--- TLd97 H13Á1 ?75 MPS3638 25 74LS132 ---.9 74E158 .69 71HC75---- .35 79 2.9 78105 .45 ----.I5 6722193 213638 AS 7419670 ----89 71HC76 - - - - 79 76qT19--- 79 M535T 1.6 CA3086 ---- 79 4.00 71170 149 7415133 ---.59 74F160 149 2771166 495 78162 A5 7115671 -- 1415 - - CA3089 1 74172 595 7419136 74E161 74HC85 - - .55 744C7237-- .89 59 78L12 45 ----./9 7115682 2.19 74173 89 7119137 ----.59 7/F162 1.59 7411C86 - - - - .40 7414C7238--- 79 7415683 219 74HC93 - - 1.39 74HCT240--- 79 74174 .59 7119138 ---- .19 711984 ---1.69 74E163 .69 In addhlon to these categories, we have tens o thousands of other components, chips, CPUs, 74175 .59 7415139 -- 49 74E164 .69 74HC107 --- 45 74I1CT241--- 79 741$685 8.00 74HC109 - - - 45 74HCT242--- RAMS, EPROMs, PALs 74176 19 7419115 ----.69 74F166 .89 89 diodes, bridges, MOVs, resistors, chokes, torroids, LEDs, displays, 711569 --2.19 74HC112 - - - 45 7414C7243--- 79 71177 9 7115117 - - 1.59 741569 150 74F19 339 cables, switches, relays, tools, Instruments and other new and surplus equipment In stock. 74178 349 7415148 --- 74E174 74HC123 .50 74HC7244-- 79 ----.9 7415783 - 25.00 74HC125 74HCT215--- 74179 2.30 7115151 ----.19 74E175 79 --- 55 79 Call or write for a complete listing 74HC26 - - - .59 71HCT251-- 741 1 71LS153 ----.49 74E182 2.9 .69 74HC132 - - - .59 74HC7257--- 69 'forms and conditions of sale: (NO MINIMUM ORDER!) . Mail all orders to Debco Electronics. Inc. 229 741S154 -- 1.19 74Sxx 74919 - -- -14.9 4025 Edwards Road. Cincinnati, 1 74192 1.19 7413155 ----.59 74HC133 49 704C1259--- 79 Ohio 45209 or call to8 -free - (800) 423-4499 a (513) 531 -4499 -Jute 74HC137 79 71HCT273--- 74184 3.49 7113156 --.59 74502 35 74F193 2.95 79 accept cash, cheda, money orders (U. S. funds only), VISA DISCOVER and Mastercard UPS groundun 74HC138 .19 74HCT80--- .69 7119157 --- 59 .35 74F194 129 shipping. $500 1st t, - 50 each additional b. 2ndDay Air- $8.50 1st Ile + 1.50 each add. - Next Day 71HC139 - - .49 74HCT29-- 19 74190 129 74L5158 ----.38 74E195 Air- 51700 111 Ile + 2.50 each add - Most orders shipped within 24 hours. (COD- orders add $5.00) 74HC147 - - - 74HCT367--- 74191 1.09 741S160 ---.38 74935 74E240 .79 .89 .69 (ALL CODS SHIPPED CASH ONLY) Open accounts available to qualified customers. 71HC148 --- .99 Thousands man.. 7192 1.09 7419161 ----.17 35 74E241 Ohio residents add 5.5% Ohio Sales Tax or submit certificate of exemption. 74HC151 - .59 Full Ibllnckldes - 74183 1.9 7415162 ----.89 74580 .35 74F244 .79 74HC153 --- .45 ALS, 4000, Nc. All prices and evaltabINty ars sub)ect to change without notice

Debco Electronics, 4025 Road, 1 112 Edwards Cincinnati, OH 45209 Orders, (800) 423 -4499 - Info, 1 (513) 531 4499 - FAX (513) 531 -4455 ad#9403 CIRCLE 230 ON FREE INFORMATION CARD

www.americanradiohistory.com B&SSAL E S Call(313) 566 -7248 FAX (313) 566 -7258 24 hrs. Hours: Monday through Friday 8 am to 6 pm EST 51756 Van Dyke St. #330, Shelby Township, Ml 48316 WE SPECIALIZE IN QUANTITY PRICING 5, 10, 20 LOTS Mahe 2/0u4 &dI Zeal/ JERROLD SA PIONEER HAMLIN TOCOM ZENITH DRX -3 -DIC 8590 BA 6110 CR 6600 -3M 5507 VIP 1600 DPBB 8580 BA 5135 CR 6000 -3M 5503 VIP DPV -5,7 8570 8550 NEW PAN NEW PAN NEW PAN PIONEER SA -8500 SERIES JERROLD GREEN E LITE (BUT ALL BASE BAND) PINK PAN BA 5000 THE PREMIER SERIES BA 6000 PANASONIC TZ - PC 1453G2 By far the best basic converter on the market today. 550 MHz (1 to 99) parental control, sleep timer, remote batteries, contrast and remote control range. Superior to all other converters

PEMpECONtSSoS NEW NO MICHIGAN SALES 9\SCNFOU` apPHAß1 ßj F V

returned. We are now offering a 6 -month warranty. In order for warranty to be in effect, this form must be signed and FOR VCR, SECOND, THIRD, ETC. HOOK -UPS. Yes, I agree all units are to be used or resold in compliance with Federal and State laws. Signature Date

Name Phone No. ( ) Address City State Zip any company or individual in doing the same. It is not the intent of B & S Sales to defraud any pay television operator and we will not assist J

CIRCLE 217 ON FREE INFORMATION CARD 113

www.americanradiohistory.com SUPER PHONE SNOOPER TRANSMITTER BIG EAR Small but mighty, Listen through it fits anywhere. walls, hear con- Phone line pow - never versations across ered. needs the room. Add a batteries parabolic reflector Transmits both sides of a & hear blocks phone conversation loud and away. The BIG EAR can be hidden clear, wireless, to any FM radio at great distances. about anywhere. Makes an ultra- sensi- Variable tunes from 70MHz TO tive intercom, Can be used as a 1.5W 130MHz FM. You can also use it as a AMP. We supply a mini- electret mike speaker phone. Size 5 "x1" In the kit. 1 "x1.75" 6 to 12vDC AA -1 $10.95 TEL -B1 $12.95

PHONE STROBE RECORDING LIGHT SWITCH If you need an This phone line attention getter, activates any radar detector within 3/4 of a powered switch is warning light, THE ZAPPER or mile. Check the brake lights of that sports small enough to flashing light for be installed any car that just went by 90 miles an hour. Back off those 18 wheelers model airplanes, try- where. Every time ing to eat your back bumper. Put the fun back in THE the phone is then this kit is for driving. ZAP- picked up the you. Use it as an emergency light for PER is a 10GHz amateur transmitter the size of a cigarette pack, recorder will record both sides of the your auto, radio tower, even use it on operates on a 9v battery, when the button is pushed, brake lights and conversation automatically. Use it in your bicycle. Has a varible flash rate. radar detector light your office to record all phone calls so the skies. Complete with the rules of the new you don't loose important information. Size 3.5'x1.8' operates on 6 or 12v ROAD WARRIOR GAME... TROLLING 1"x.6" DC only. FOR TAIL LIGHTS, America's fastest grow- Built $49.95 TEL -SW1 $12.95 ing highway participatory sport. ST-1 $9.95 Kit $39.95 DIGITAL CAPACITANCE VOLTAGE BLINKEY THERMOMETER METER MONITOR LIGHT TV The DT -3 kit will turn This kit will turn This kit has 7 This kit is perfect NOTCH FILTERS your digital volt your digital volt multi for FOR CHANNELS meter into -colored decorating hats. an accu- a meter into leds to monitor name badges, & rate digital ther- 2 I 12, thru 22 mometer with .1 capacitance your 8. or 5v model trains. Add Our TV filters eliminate meter. Turn that DC ONLY degree resolution. systems. a box, set it on the unwanted TV Measures tempera- junk box of channels or inter- Build it to work in dash of your car, ture from -40F to unmarked capaci- 1v, 1/2v, 1/4v ference that alters both sound and or use it as an auto 250F degrees. It has tors into a fortune steps. Great for video with a beep beep beep. Works on a remote sensor .25' of usable parts. burglar alarm. nicad packs, cable channels 2 thru 22. and the 'SNOOPER SO and can be Measures capaci- Comes with 2 mounted many feet tors from <2.2pF autos, boats, & BULLET mobile homes, alternate flashing away from the to 2.2uF. 1.75 "x2" or meter. Size 1.5x1.2" leds. Size .5 "x.5" 9 NOTE: All TV Filter Kits are sold for educational purposes only. You must obtain per- 9vDC battery chargers. 9vDC P.C.B. 1.3 "X2.7" to 12vDC mission from your local cable company before using these filters on your cable system. DT -3 $8.95 CA -1 $12.95 VM -1 $7.95 RB -2 $3.95 DF -222 Kit $14.95 WIRELESS FM WIDE BAND MICROPHONE PREAMP This Manual contains all Small but mighty, Ideal for preamp this little jewel will for scanners. schematics, parts & P.C. out perform most hand held radios, units many times frequency coun- board layouts for all of the its price. It really ters. Amplifies low Rainbow Kits. Use your own stomps out a sig- level (weak) signal. The WM -1 kit nals. If the signal parts to construct any of our is a buffered wireless mike that operates is extremely low 2 amps can be used in from 80 -MHz to 120MHz FM. the fre- series. 1MHz TO 2.5MHz @ 2.8dB of kits. quency of any broadcast FM radio. 1dB compression = +0 dBm gain: Includes a mini -electret mike. .8'x1' 6 to 1MGHz -20dB to 2.5GHz -6dB Requires 12vDC 12vDC @ 16Ma KIT BOOK $14.95 WM -1 $14.95 WBA-6 $19.95 $5.00 off if you buy any kit VOICE ACTIVATED INDUCTANCE Please add sufficient postage 4C SWITCH METER First lb $5.00 This VOX circuit We will accept telephone orders for Visa or Mastercard can be used to This is the kit every one operate a tape has been asking for. Turn recorder, ham your digital volt ohm meter To Order Call radio, CB radio, or turn on an alarm. into an inductance meter. 317- 291 -7262 The VOX -1 kit ha 100MA of output. It will read inductors 3uH That operates a relay, light, motor, or ? to 7MH. Size 1.5 "x1.6" What could you do with a sound acti- ELECTROf1IC RAIf1BOUJ vated switch? Size 1,"x1.3" 7.5 TO 9vDC 18vDC IA -1 $14.95 VOX -1 6254 LaPas Trail Indianapolis, IN 46268 $6.95 CABINET $ 8.95 114

CIRCLE 242 ON FREE INFORMATION CARD

www.americanradiohistory.com Established 1945 645-212 Minimum M/C & VISA '20 I ((800)516) 756 -1750 Order K E L V N 53 756- 1763IFAx KELVIN CATALOG ullimillallimamlummilmillitim10 HUB DRIVE, MELVILLE, NY 11747 (516) Stock No. 650412 Standard Features AC & DC VOLTAGES DC CURRENT RESISTANCE CONTINUITY TESTER - Buzzer DIODE TEST 10M ohm INPUT IMPEDANCE ACCURACY +/- 0.5% RDG TRANSISTOR F REO COUNTER UTO INDUCTANCE up to 20MHz RANGE BATTERY TEST FREOCOUIMER CAPACITANCE with 3200 counts DC CURRENT u to MHz from 1 pF to 20uF C CURRENT ANC 10 Amp CAPA TRANSISTOR DC CURRENT from 1 F to 200uF ANALOG BAR AC/DC CURRENT AC/DC CURRENT TRANSISTOR 10 Amp 10 Amp DUTY 20 Amp 150 LE 200 LE 300 LE 400 LE Stock N 990122 Stock # 990123 Stock # 990125 Stock # 990124 $4995 150 LE - Student 200 LE - Technician 300 LE - a 0 -#.moe 400 LE - Engineer $2995 4995 $7995 KELVIN CAPACITANCE Designed to meet IEC-348 & UL -1244 100 Basic KELVIN METER safety specifications. 250 LE # 990087 $1 995 $5995 Cases # 990126 Protective 200LE, 300LE AC & DC 0.5% ACCURACY For Models 100 Basic,150LE, VOLTAGES RANGES: 20mF, 54.95 (#990088) DC CURRENT 2000uF,200uF,20uF, RESISTANCE 2uF, 200nF, 20nF, 3 1/2 Digit LCD ` Q 2000pF, 200pF Case For Model 400LE 59.95 ( #990116) CONTINUITY TEST `g _ Zero Adjust -Buzzer Safety Test Leads 2 Year Warranty LOW BATTERY INDICATOR Test Socket for DIODE TEST BATTERY TEST Plug -in Components (Parts & Labor) The Ultimate Meter TRUE RMS - LCR - Hz - dBm

DC AC 1lN Popular Electronics (Reviewed - May 19931 AUTO "Not only does the Kelvin 94 boast aloi of features ... the features go the extra I n' p F f distance." Iw A d8wMkllle- 1 I "lf we had to run into a burning building to do some emergency troubleshooting and could carry in only one piece of equipment, the Kelvin 94 would be it!" ° ,

t 1111111111111111111111111111111111111111° 12 INSTRUMENTS IN ONE - DC VOLTMETER, AC VOLTMETER, OHMMETER, AC CURRENT, DC CURRENT, DIODE TESTER, AUDIBLE CONTINUITY OR; MAX, MII /AVG RELATIVE DC /AC TESTER, dBm, FREQ COUNTER, CAPACITANCE METER, INDUCTANCE METER, LOGIC PROBE

0.1% ACCURACY AUTO SLEEP &AUTO POWER OFF ON DC VOLTAGES BUILT -IN TO SAVE BATTERY LIFE with Bypass TRUE RMS ON AC VOLTAGES & CURRENT SHOCK RESISTANT HEAVY DUTY CASE WITH FREQUENCY COUNTER YELLOW RUBBER HOLSTER TO 20 MHz & TILT STAND

LARGE EASY -TO-READ WATER RESISTANT SEALED CASE 3 3/4 DIGIT LCD DISPLAY 30 DAY MONEY BACK SATISFACTION GUARANTEE 95 MODEL 94 0.1% ACCURACY Water $199 #990111 on DC Voltages Resistant COMES COMPLETE WITH YELLOW HOLSTER, PROBES, Freq Counter to 20 MHz BATTERY, FUSE, STAND

Protective Cases for Model 94 Meter is designed in accordance with safety Regular Padded Zippered $9.95 0990116) requirements specified in Zippered $14.95 (#990115) Deluxe Padded IEC-348, UL -1244 VDE-0411. 115

CIRCLE 249 ON FREE INFORMATION CARD

www.americanradiohistory.com SCHOOLwPROJECT CORINER DO -IT- YOURSELF ELECTRONIC KITS po Mark V t Catalog & Information Electronics, Inc. Sale Melody Generator A Kit $ 13.85 8019 E. Slauson Ave., 213/ 888 -8988 Mini-Amplifier Venta Especialecial 1 Digital o Montebello, CA 90640 1 Fax 213/ 888 -6868 6 ,j i,.óó ORDER 1- 800 -521 -MARK / 1- 800 -423 -FIVE Dynamic Noise Reduction 26.00 Bar/ Switch Mark V has more than 60 kits available including high -fidelity audio 8.45 20 of Level Display 39.79 products, laboratory equipment, power supplies, light controllers, V P rY 9tnP P uPP ßh Microphone Mixer 19.79 games and numerous projects! Audio amplifiers range from 6 to 300 1 W Mini -Amplifier 6.87 watts. Kit skill levels are specified asA beginner, AA intermediate, Digital Clock with Timer A A'0. 25.00 or AAA advanced. Quality kits at unbeatable prices starting from S Stereo Pre -Amp with Mic Amp. 9.78 ' 7!! ShippingPP 8 within 48 hours. Foreign8n orders from Mexico, South Walkman Booster Stereo Amp.A 28.50 .^ America or countries are European welcome. In business since 1985. SEE OUR CATALOG FOR MORE KITS I STEREO LOUDSPEAKER PROTECTOR REGULATED DC POWER SUPPLY FLUORESCENT LIGHT DRIVER

It is short . - Super fast acting relay protects - I AA circuit proof and - This umt drives 6-40 speakers against destrfictive DC has overload protection. watts fluorescent light voltages. Can connect directly to Output voltage is variable for portable and over a range of 0-50 volts. a power amplifier or can use a emergency use. Works Current limit trip is Kit:$ 11.97 from a 7.2 - 16 VDC separate power supply. Has 3 adjustable up to max of 3A. second turn-on delay to avoid battery. Includes a "Hi- Efficiency May use Mark V #002 S Switching Mode IC Driving Circuit" Kit: 15.85 tum -on thumps. ( 1 lb.) Kit: $ 17.75 transformer. (1 lb.) suitable for use with different li ts. 120 -250W MOSFET POWER MONO AMPLIFIER AF -2 (6 lbs.) SURROUND SOUND PROCESSOR Power Output: 250W into 4 chins RMS(42VX2 6A transformer is SM -333 AA (5 11,s.) It has inputs or used). 120W into 4 ohms RMS(33VX2 4A transformer is used). VCR, LD, CD Frequency Response: 3Hz- 22,000Hz. THD: <0.03 %. Signal to and can also be 4- 4- Noise Ratio: 91dB. Sensitivity: 1V RMS at 47k. Load Impedance: used with liners, t 4 or 8 ohms Power Requirement: ±46VDC 4A or ±6OVDC 6A. Kit:S73.00 tape decks and May use Mark V model 012 Transformer. Suggested Capacitor LP disks. Frequency Response: 20 Hz- Kit: S 89.80 Asmb.$ 114.80 10,000uf 100V Model 019. Suggested Metal Cabinet LG -1925. 20KHz THD:Front Channel 0.05% Rear Channel <0.25%. Input signal voltage: 0.1- 300W HIGH POWER MONO AMPLIFIER TA (5 -3600 lbs.) AAA 3.5V. Output: Front Channel 0.1 -15V Rear Output: 300W Per into 8 ohms RMS. 540W music power Channel 6.6V. Delay Time: 5-50 ms. Input at into 8 ohms. Frequency Response: IOHz -20KHz THD: < Impedance: 47K Power Requirement: 100- . _ 0.05 %. Sensitivity: 11 1 IV RMS at 47K. Power Requirement: 60 to 120VAC, 60Hz Ready to plug whin I' 75 VDC at 8A. May use Mark V Model 007 or 009 assembled. Asmb:$85.00 Kit 85.00 Transformer. Suggested Capacitor: 10,000uí80 -100V Model Asmb.$ 110.00 019 Capacitor. Suggested Metal Cabinet LG -1925. AC/DC STEREO PRE & MAIN AMP. sM- 120W + 120W PRE & MAIN STEREO AMPLIFIER TA- 800MK2 (4 lbs.) 720V(7lbs.) 120WX2 Music Power THD: <0.2 %. Input Power Output: 120W into 4 ohms RMS. 72W into 8 ohms RMS. Sensitivity: Tape Frequency Response: 10 - 20 KHZ. THD: < 0.01 %. Tone Control: 300mV 47K, CD/Aux Bass ±12dB, Mid ±8dB, Treble ±8dB. Sensitivity:Sen Phono Input, 300mV 47K, Ph ono i- 3mV into 47K. Line, 0.3V into 47K. Signal to Noise Ratio: 86dB. 3mV 47K, Guitar/Mic Power Requirement: 40V DC @ 6A. May use Mark V Model 001 Kit:$ 75.00 3mV ( 600 ohm - 47k Kit: $ or 008 Transformer. 63.92 Asmb.$ 73.95 Suggested Metal Cabinet Model LG -1924. ohm). Tone Control: Treble±8dB, Basst8dB. Frequency Response: Re7Hz Sigtal to 80W + 80W PURE DC STEREO MAIN POWER AMPLIFIER TA -802 (4 lbs.) AA ( ) Noise Ratio: 78dB. Power Requirement: AC Power Output: 80W per diannel into 8 ohms. THD: < 0.05 %. 110 /60Hz DC 12 -16V. Ready to plug in Frequency Response: DC to 200 KHZ, -0 dB, -3dB @ 1W. when assembled. Asmb:$ 89.00 Power Requirement: 30V AC X 2 @ 6A. May use Mark V Model 001 or 008 60 +60W STEREO POWER AMP.AA Kit: $ 45.94 - y Transformer. Suggested Capacitor 8,200uí SM -302 (1I s.) Asmb.$ 59.72 w`' r, 50V Model 017. Suggested Metal Cabinet LG -1924 t provides 3 input jack One pair ct 30W + 30W PRE & MAIN STEREO hgh AMPLIFIER TA -323A ((1 Ib. ) high impedance mcro - Power Output: 30W into 8 ohms RMS per diannel. THD: < 0.1% from phone. The two remain- C74100 HZ to 10 KHZ. Sensitivity: Phono 3mV @ 47K. Timer, Tape Kit:$ 73.00 ing pairs are for high 130mV @47K. Signal to Noise ratio: 80dB. Power Requirement: 22 to & low level input sources. Power Output: 36V AC, 3A. May use Mark V Model 002 Transformer. Suggested 60W per channel into 4 ohms RMS. 20Hz- Kit: S 29.50 Aanib.$38.50 Cabinet LG -1684. 20KHz THD: <0.1 %. Input Sensitivity :Mir /Guitar 10mV, Hi 380mV, Lo METAL CABINETS TRANSFORMERS ( 5 -12 lbs.) 640mV.Ready 4 "TOROIDAL TRANSFORMERS toplugin when assembled. Asmb.:S85.00 ALUMINIUM FRONT PANEL 9 # 001 28V/30V X2 6A S 28.00 31/2 MULTI -FUNCTION LED DPM LG -1273 3X12X7" (4 lbs.)S 23.85 # 002 36V X2 3A 23.00 SM-43 (1 lb.) LG -1684 4X16X8" (7 lbs.) 28.50 # 003 AC/DC Voltage range: 40V X2 6A 30.00 Imge LG-1924 4X19X11'/2' ( 10 lbs.)) 34.50 # 008 ** 28V/30V X2 6A 38.00 range DC currentloan LG -1925 5X19X11'/2 "(10lbs.) 38.00 # 012 * 6A 66.00 range:ren 1 miQO 2 amp. LG -1983 2'/,X19X8" ((7 lbs.)) 32.50 # 012** 33/40/42V X2 6A 45.00 Kit: S 34.50 Capacitance range: 1pf to 2 Minimum order S 2000 We accept Visa. MasterCard. Money Orders, and Checks(allov microfarads. Frequency Counter: 10HZ- 2 weeks for clearance) We ship by UPS ground inside US (min $400) and ship by US 20KHZ. Max indication ±1999. Power mail outside US Please call our operator for orders over 2 lbs or foreign orders Supply: 5-6V DC, 200ma. Asmb:S 43.00

116 CIRCLE 303 ON FREE INFORMATION CARD

www.americanradiohistory.com COMPUTER PARTS - SURPLUS ELECTRONICS - SERVICE PARTS - ACCESSORIES SCHOOL & UNIVERSITY P.O.s ACCEPTED! - SCHOOL QTY. DISCOUNTS AVAILABLE' CARRY CASES Printers & Accessories Bulk Disks CHIPS & ROMs A.3.5"x12S'x14 ". $14.95 Epson FX 100 565.00 525" DSDD Disks (100 pcs) _._$12.00 Processors Designed for small laptop or notebook Epson FX286 $75.00 3.5" DSDD Disks (50 pcs) ...... _.$14.50 80287-8 $19.00 computer. Side pockets far 12 35" Disks Citizen GSX 130, 140, 140+ & 3.5" DSHD Disk (10 pa).._._...... _.$3.90 V20-8 $2.00 V28-10 ...... $6.00 Shoulder Strap & Handle & Manual. 200GX Manual Sheet Feeder. 525 "Cleaning Disk...... $1.00 MC68030 -16 á39.00 MC68882 -16 $39.00 AH29804 -0 NEW $24.95 3.5" Cleaning Disk ...... $200 B. 3" x 16" x 13" 414.95 16550 (Enh.serial port chip) $13.00 Laptop Computer Case with shoulder Citizen GSX 130, 140, 140+ & Backup Tapes RAM strap Outside pocket is big enough to 200GX Printer Stand. 4116, 4164 or short lead 41256 -12 hold a notebook computer! AH29806-0. NEW $7.95 DC2000 Tape (Gigatek brand) $12.00 or -15 50t DC603 Tape (Gigatek brand)...... $9.00 41024 (1 Meg x 1) or 44256 33.00 $19.95 C13 "x16S'x16.5'. Power Supplies GC9100 (1 Gig. Gigatrend tape).$19.00 256x8 -15 SIMM...53.00 / -12 54.95 IBM PS/2 Transport Case 256x9 SIP -12. $5.95 Side keyboard pouch Wheels & leash Mini Tower Case Power Supply. Cables & Connectors 256x9 SIMM -80 58.00 Can hold Mac LC or Hsi & Monitor, Ogs 145 Watts. Refurbished...... $20.00 System. Has3 pockets inside. Rigid New $29.00 DB25 IDC (Flat ribbon) connector Batteries AA size, 3.6V lithium $4.95 Bottom Side handles. Well Constructed! XT Power Supply. 135W $25.00 1/2 M/F 49t 3.6V or 6V $6.95 XT S AT Type "plug in" IBM 65Watt P/ $5.00 DB37 ¡DC (Flat ribbon) connector D.16"x16 "x7 "_ $14.95 Tower or AT Type ...$49.00 300W. M 49t EPROMs Olivetti Carry case. Can be used to carry AT Power Supply. 200W many diEerent computer systems. Refurb $29.00 MFM /RLL, IDE or Floppy $1.00 2716 or 2732 75t Apple / /e, Mac H, Hx, Hfx. Mac Ha /d Serial Link Cable 2764 $1.00 & 7(70/800 series. Mini Tower $1.50 We can repair most types To link two computers for data 27128 size too! Sturdy construction heavy fab- 27256 $2.00 ric, shoulder strap & handle. of power supplies. transfer. Ends. Can be DB9 to DB9 27512 $2,50 Computers & More. or DB9 to DB25 $9.95 271000 (32 Pin) $4.00 E.155' x 125" x 2.75" ...... $19.95 27010 $6.00 E xt er i or pocket 13" x 9" x 1.5 ". Interior Microcontrollers has poi4tionable retainer and small Fujitsu Cash Drawer. 8748 54.00 8749 $6.00 "attache" panel for 3.5" disks, pens, Hooks up to any receipt printer papers. Padded case. Black with red 8751 $9.00 highlights, carry handle, shoulder strap. w /parallel I /O. RJ45 Has check Originally for Digital. "deposit" slot in front of drawer. FLOPPY DRIVES

F. 12" x 15" x 2.75" . -a $19.95 Used 360K 5.25" Drive .$14.95 Zippered Exterior et 12" x12" x 1 ". Used 1.2 Meg 5.25" HH 535.00 Carry handles & Shoulder Strap. for Greenish color. Originally for IBM, Mitsubishi Part 559.00 Mitsubishi. Ask for our Apple 11 Related items, specials & surplus electronics. 602 Garrison St. Oceanside, CA 92054 A I I t e c h E l e c t r o n i c s CO. 9-6 PM Mat.-fri.-9-5PM Sat [4 All other Inquiries: & Tech Support: 6191721 -7733 Orders O n l y : n : Fax (School PO sr Quotes, Info.): 6191721 -2823 8001995-7773 We Buy Excess Computer Related Equipment. S P E C I A L S Computer & Drive Cases Peripheral Cards & Dexxa Hand Scanner 300dpi $59.00 Desktop XT/AT Case & 150W P/S Accessories Keyboards XT System Refurbished Turbo Switch & LED, 2 Exposed HH Mono Monitor 360K Drive drive bays $29.00 AT Floppy Serial & Par Controller $9.95 $95.00 External Floppy Drive Case. Holds two Al IDE HD Controller $9.95 or one FH With Power Mono /Parallel Port $9.95 AT System Mono Monitor HH drives drive. Universal Video Card. 8 Bit 8 Mhz 1024K 1.2M Drive Supply $19.00 CGA /EGA/VGA $39.00 $159.00 External MFM/RLL HH HD Case Full Length CGA w /RCA out $14.95 Holds HH 5.25" Hard disk $19.95 EGA Card $29.00 Open face SCSI Case & P /S. For 101 Keyboard (NEW) $29.00 Monitors 5 Pin kybd to PS /2 adapter $2.95 SyQuest or CD ROM. Two 50 Pin 16 Bit Backplane board $10.00 9" Composite "Box" type cabinet. Centronics Connectors $45.00 Microsoft InPort Mouse Card (only) $19.00 Green screen. Good for security moni- External SCSI Case & P/S For 5.25" or Winning Wordperfect 5.1 in 5 hours! 59.95 tor. Input for 7512 (standard) or High 3.5" HH Drive. Two 50 Pin Connectors AT 2 Meg Mem. Exp Card w/2 Meg $39.00 101 XT /AT Keyboard 19.00 impedance $35.00 $45.00 Color Composite Monitor. Not suitable & ID Selector Keyboard Wrist Pad $1.95 SCSI Case & P /S. Holds 2 for 80 column text but can be used for com- Full height puter games, Nintendo, as a video HH Drives or 1 FH $65.00 KESTOR SOLDER $4.95 EA. External CD ROM Drive Case Alloy Ilia, Ma Core monitor. Some have sound input also. 66 $69.00 36 or 40 Pin CD ROM Drives. To install Sb5 .025 282 $45.00 Sn60 .001 282 66 sed Refurbished Mono. DB9 $35.00 a CD on your system externally Sn60 .020 282 66 CA Residents please add 7.7S% San tas. MiNmum gipping & handling charges 15.00. (This coven most orders) Warranty: Used/Refurbished products 60/40 .031 331 40 have .9U day warranty ALL Returns must have RMA I, call before shipping back tow. No Returns without r, invoice. Shipping & Handling charges are Sn63 .031 282 66 nonrefundable 70% Restocking charge, apples to products puchased in error 4 incomparability problems. &hoot k UniversityPurchase Orden accepted, m AOC only. Prices and ay.ilab,Sy subject b changer anytime without any notification whatsoever. Some Products are refurbished product. others 117 CIRCLE 282 ON FREE INFORMATION CARD

www.americanradiohistory.com Technicians' Turntable RS -232 A -B Switch Parts Fully shielded, steel enclosed data switch with gold Express plated female connectors. Inie rn a(onal Int. All 25 pins switched through. High reliability rotary type MI&Turntable to switch. Compact size. Anti - speed repair of VCRs, TVs and more. Allows technician 1" Titanium Dome Tweeter skid rubber feet. Boxed. to Can be used to switch mul- easily turn unit for convenient repair. Features a ferro tiple printers or computers. Dimensions: 20" W x 15" D x 1 -1/8" fluid cooled Kapton 1 year guarantee. Net H. Black pebbled surface. Includes voice coil and a weight: 1 -3/4 lbs. 4 anti -skid adhesive feet. Net rubber surround. weight: 9 lbs. #EN- 130-010 $1000(.2) Very natural sound- #EN-360 -427 fj ing high frequency $2850EAC0 reproduction with High Voltage Capacitor Kit Multi- Speaker Distribution Box extended response to 30KHz. Power handling: 50 watts RMS/75 watts max Voice coil diameter: 1" Impedance: 8 ohms Frequency response: 2500- 30,000 Hz Magnet weight: 5.3 oz. Fs: 1000 Hz SPL: 93 dB 1W/1m Net weight: 1 lb. This multi- speaker distribution box features metal construction, inputs for 580,, #EN- 275 -050 .. $1700(.3)... $15eo left and right channels, and 8 set of speaker outputs. Color coded, This 85 piece kit contains a selection spring loaded pushbutton terminals accept 12 to 22 gauge wire. in of 250, 350, and 450 volt Built electrolytic impedance protection can be switched in or out. Power handling capacitors. 5 1, 10" Treated Paper Cone pieces each of 2.2, capacity: 300 watts (impedance protection switched off), 150 watts 3.3, 4.7, 6.8, 10, 22uf and 2 pieces Woofer (impedance protection switched on). Black color. Made in the U.S.A. each of 33, and 47uf, 250V radial Dimensions: 19 "W x 3 -1/2 "H x 2- 1/4 "D. Net weight: 2 lbs. This 10' caps. 5 pieces each of 1, 2.2, 3.3, woofer fea- 4.7, 10uí and 2 pieces each of 22, #EN- 300 -600 $14980EAC0 tures a non - 33uf, 350V radial caps. 5 pieces Deluxe TV Wall pressed, poly each of 1, 2.2, 4.7uf and 2 pieces of Center Off Toggle mer laminate 10uf, 450V radial caps. Over $62.00 Mounting System cone and a rub - wholesale cost if purchased individu- DPDT center off Deluxe wall toggle switch. 6A, ber surround. ally. Net weight: 1 lb. bracket fea- Well suited for applications 125VAC. (1/2" tures heavy #EN- 020 -950 $49 95EACH where a high level of perfor- mount.) duty, all steel mance is desired, but at a rea- construction sonable price. Aluminum voice 22 Amp Power #EN- 060 -087 .$1750.9). 50 Supply $ (10-UP) and the plat- coil and vented pole piece. The perfect form is adjust- Power handling: 70 watts RMS/ test bench F -59 Deluxe Connector able from 12 -1/4" 105 watts max Voice coil diam- power to 16 -3/4 ". Has 4 pivoting points 1 Popular eter: -1/2' Impedance: 8 ohms supply. connector for and swivels 180 degrees for a vari- Frequency response: 30 -2,800 cable TV systems. ety of viewing angles. 60 lb. capac- You can Full Hz Magnet weight: 20 oz. Fs: run just attached ferrule ity. White enamel finish. Must be for hex crimp. Securely 31 SPL: 91 dB 1W /1m VAS: any mounted directly to studs. Net about holds RG -59 cable. 4.1 cu. ft. QTs:.35 QES:.39 12 VDC powered product with- weight: 9 lbs. QMs: 3.69 XMAx:.27 in. Net out worrying about overloading #EN- 090 -355..296( -49) $3280 weight: 4 lbs. 22C(s0.UP) #EN-240 -772 the supply. Highly regulated IC #EN- 295 -260 $2900(_3) $2690(4-UP) and transistor circuitry with built Mag-Lite Focusable Flashlight in crowbar protection alarm. (1111 MAGLITE Dual metering for voltage and These high tech flashlight from Mag -Lite are constructed rug- 12" Musical Instrument Speaker current. Output adjustable be- of i4 Ribbed tween 10 -14 VDC. Adjustable ged aircraft aluminum for shock paper cone output current for testing ampli- resistance and are anodized in- with treated fiers. 2 year warranty. side and out to guard against corrosion. High intensity light beam can cloth accor- Specifications: be easily focused from a flood to a spot. Rubber "O" rings provide ex- dion sur- Output voltage 10 -14 VDC cellent moisture resistance. The sealed switch is self cleaning to elimi- round. Output current (cont) 22 amps nate oxidation and to ensure high reliability. Don't settle for imitations. Vented pole Output current (surge) 25 amps See why most police and fire departments across the country use Mag- piece for heat Dimensions 9 "x5 "x11" Lite! Includes spare krypton lamp. Lifetime manufacturer warranty. dissipation and Net weight 19 lbs Designed and manufactured in the U.S.A. N2 PIONEER Price Price Price reduced distor- #EN -120 -504 $13903(.3) $12990 4uP tion. Perfect replacement for many Part # Description (1 -3) (4 -9) (10-UP) P.A. and musical type speakers. EN-361-510 2 D-cel black $22.90 $20.50 $19.50 Power handling: 150 watts RMS/ Strobe Flasher EN-361-515 2 D-cel red 22.90 20.50 19.50 200 watts max. Voice coil diameter: Weatherproof red EN-361-520 3 D-cel black 23.90 21.45 19.95 2 inches Impedance: 8 ohms strobe flasher. EN-361-525 3 D-cel red 23.90 21.45 19.95 ' Frequency response: 50-5000 Includes 9/16" EN-361-530 5 D-cel black 25.95 23.50 21.90 Magnet weight: 50 ozs. Fs: 50 Hz mounting stud and EN-361-535 5 D-cel red 25.95 23.50 21.90 SPL: 96 dB 1W/1m VAS: 3.56 foam gasket. Op- EN-361-540 Mini AAA cell black 11.50 9.95 9.25 QTs:.43 QES:.49 QMS: 3.62 erating range 6 -12 EN-361-545 Mini AAA cell red 11.50 9.95 9.25 XMAx:.129 Net weight: 10 lbs. VDC. 2 -3/4" (W) x EN-361-550 Mini AAA cell blue 11.50 9.95 9.25 EN-361-555 D -cell wall mount Manufacturer model number: 1 -5/8" (dia). Net brackets 5.20 4.70 3.95 A30GC50 -52FQ. weight: 1/4 lb. Cabinet Carpet #EN- 290 -142 .. $49'01 $4550(4.uP) #EN- 335-123 .. $1200.3)...$1 125(cup This high quality carpet conforms easily to sharp corners because it has no stiff backing. You can also stretch it 3M Super 77 Spray Adhesive to cover irregular shapes. This is the covering of A high tack, fast drying transparent choice for car, stage, and amplifier cabinets. adhesive to permanently attach Carpet is strong, yet easy to cut with knife carpeting, cloth, foils, foams, etc. to or scissors. Adhere with spray adhe- wood, metal, painted or unpainted sive or latex contact cements. Pro- surfaces. High initial "grab" with vides protection and good looks. Sold sufficient time to position materials. by the linear yard. 54" wide. 24 oz. can with two spray head #EN -260 -765 Dark Charcoal actuators (wide and round). #EN- 260 -767 Medium Grey #EN- 340 #EN- 260 -768 Jet Black -255 $913(,,1) $716(2.35) $7S0(36-UP) Per Linear Yard, 36" x 54" $325 $450(1-49 VOS) (50 VUS -UP) Parts Express 340 East First St. 30 day money back guarantee 420.00 minimum order We accept Mastercard, Visa, Discover, and company Dayton, Ohio 45402 C.O.D. orders 24 hour shipping *Shipping charge = UPS chart rate + $1.50 ($4.00 minimum charge Hours 8:30 Local: 513- 222 -0173 am - 7:00 pm ET, Monday - Friday 9:00 am - 5:00 pm Saturday. Mail order customers, please call for shipping estimate on orders FAX: 513- 222 -4644 exceeding 5 lbs. Foreign destination customers please send $6.00 U.S. funds for catalog.

CIRCLE 262 ON FREE INFORMATION CARD

www.americanradiohistory.com 3 In 1 Universal Remote 6 -1/2" Two -Way System Parts This remote will operate any remote con- The basis of all architectural audio systems. 1 This is our most popular in -wall. The perfect trolled cable box, TV speakers. ExpressInternational Inc. system for main and/or surround or VCR at just a frac- Easily installed in any 2 x 4 or larger wall. tion of the cost of a Retrofit design allows installation in new or factory replacement! existing walls in minutes. Features high Drives This unit is already quality crossovers and premium drivers that Teac Floppy Disk preprogrammed to incan outperform the name brands. High quality disk Specifications: 6 -1/2' poly woofer with a 10 clude the most common dome made by oz. magnet, 1" field replaceable soh drives codes. It is attractively tweeter. Integral 2 -way crossover with Teac. Standard styled, durable, and easy pushbutton wire terminal. 8 ohm impedance. putty color. High to set up and operate. The Frequency response: 40-20,000 Hz. 40 watts RMS/80 watts max power handling density 3 -1/2 ", manufacturer even offers a capability. Sensitivity: 90 dB 1W/1m. Dimensions: 8 -1/2" (W) x 12" (L) x 3.1/2' 1.44 MB and toll free consumer help line to an- (D). Net weight: 9 lbs. per pair. 5 -1/4 ", 1.2 MB. 2s5Á swer questions and provide cus- #EN- 300-036 524999)suo. LIST) $12490)í.a Pns) "" $1 cns tomer assistance. Requires 2 AAA -1/2" drive) included). (3 batteries (not Kester "44" Solder 130 -530 .. #EN- $5990EAcN $55"(2 -UP) $9951) #EN- 180 -565 .. $12500-9). UP Kester "44" rosin core solder is designed (5 -1/4" drive) for electronic and electrical work. It uses a #EN- 130 -532 .. $6990EAcM . S649S)aUPl Designing, Building, fast acting, instant wetting, non -corrosive, And Testing Your and non -conductive flux for faster The Ultimate Test CD soldering and a strong, long lasting bond. The Ultimate Own Speaker System Test CD was Completely revised Alloy Price Price designed for use and updated to reflect Part # Lead/Tin Spool Dia. (1 -3) (4 -UP) both the audio the latest trends in by EN- 370 -080 60/40 1 lb. .031' $10.95 $9.95 and the audio technology, this amateur EN- 370 -090 60/40 1 lb. .050" 10.95 9.95 of B. professional edition David `4":1:=4.:" EN- 370 -098 60/40 4 lb. .031" 43.80 39.50 engineer. Weems' best -seller sound EN- 370 -072 63/37 1 Ib. .020" 13.60 12.25 This CD can be will guide do -it- EN- 370 -074 63/37 1 lb. .031' 11.50 10.50 used to test CD players, speakers, yourselfers through the building and for tuning instru- and testing of low -cost speaker Magnetizer/Demagnetizer amplifiers, 36 Piece Precision Driver Set ments. The manual is written in systems that rival the most ex- Handy device to the market. 224 Contains 6 indi- easy to understand English and pensive units on magnetize (or demag- takes you step -by -step through each pages. Copyright: 1990. Third vidual kits. Eac track of the CD and explains its edition. Net weight: 1 lb. netize) screwdrivers, Moody kit con- purpose. The Ultimate Test CD is a #EN -500 -021 $1 695. tweezers,and various tains locking, necessary tool for anyone who is other tools. chuck type, audio sound. knurled steel serious about quality #EN- 360 -700.. $990),-9) $$90,0-uP) #EN- 510 -100 $795EAc. Speaker Surround Repair Kits handles and 5 inter- The set in- throw away expensive changeable ends. Don't Kit loudspeakers just because the foam cludes: Slotted Screwdriver Ungar UTC SS ", and has dry rotted, or has been (.040', .055 ", .070 .080', surround .100' Cross The punctured. With these new repair kits slotted blades), ( 1 awl plus, Ungar from Parts Express, you can save Driver & Awl Kit .055 " /1.4mm/#000, .080' /2.0mm/ UTC BIG bucks by repairing the foam SS is an #00, .100'/2.5mm/ #0, and .125 " / surround and avoid costly blades), eco- loudspeaker replacements. The kit 3.2mm/#1 cross recess Hex Driver Kit (.035', .050', nomical includes 2 pair foam surrounds .078', .093" hex dual (except for the 15' kit which 062', and blades), Torx Driver Kit (T -6, T- wattage sol- includes one pair), a plastic syringe dering station (specially 7, T -8, T -9, and T -10 Torx filled with 25cc of adhesive /Nut for use in the formulated for various speaker cone materials), 5 foam swabs for blades), Socket Wrench Kit (5/64 ", 7/64 ", home, shop or unGan. application of glue, and complete repair instructions. Driver 3/32', at work. Dual temperature capa- 1/8 ", and 5/32" socket wrenches), bility makes it ideal for surface Price Price and Open End Wrench Kit (7/64', 1/8 ", 1/4" open mount components. Station in- Part # Size (1 -3) (4 -UP) ", 5/32 3/16 ", and tip end wrenches). Includes black cludes an iron holder, and $19.95 $17.95 electronic components EN- 260 -920 8" kit leatherette case. protects EN- 260 -925 10" kit 20.50 18.50 from static discharge. UL listed. $5990(,.uP, E N-260-930 12" kit 21.90 19.90 #EN- 361 -215 $6590),-3) Net weight: 2 lbs. EN- 260 -935 15" kit 22.90 20.90 #EN- 372 -060 $59B0E.c, 12V, 15 Ah Battery Head/Disc Cleaner Save big on this rechargeable lead acid and Disc Cleaner is a CFC free cleaner which Head Has many uses: computer back -up remove carbon deposits, metallic oxides, dirt, battery. will -up battery, tractor dust and other contaminants from magnetic heads. upgrade, alarm back garden more. Sealed in a high -flammable Head and Disc Cleaner has superior starter battery, and Non impact Bolt and nut type properties to freon blends and is polystyrene case. cleaning compared terminals. Dark blue color. Dimensions: 7'W safe on most plastics. HCFC blend. 6 oz. liquid. x 6 -1/2 "H x 2- 15 /16 "D. Net weight: 14 lbs. Limited availability. Compare to $2495Is.uP) #EN- 149 -100 $6000 S2999) #EN -341 -075 $390), -,,, Chamois Swabs Drive Belt Kit Genuine We've selected 18 of our most popu- sheepskin lar VCR, cassette and turntable belts swabs to include in this kit. 87 belts total, for five each of 17 square belts from cleaning 2.3" to 13.2" for VCRs and cassettes, delicate and 2 each of the 23.6" turntable video and belt. Have the belt you need in stock audio heads. when you need it. A $50.00 value. Chamois leaves no residue. 10 Net weight: 1/4 Ib. pieces per package. Reusable.

#EN -400 -910 $299Sxir #EN- 200 -028 S299I,.9Pxos)$26ol,omxos.up)

Parts Express 340 East First St. CALL TOLL FREE Dayton, Ohio 45402 Local: 513-222-0173 FAX: 513- 222 -4644 1 -800- 338 -0531 119 CIRCLE 262 ON FREE INFORMATION CARD

www.americanradiohistory.com 13406 Saticoy Street North Hollywood, CA 91605 -3475 CORP. ..,.....<

TEKTRONIX 528 SOLID STATE N.T.S.C. WAVEFORM MONITOR

NEW AN /URM -120 50 OHM HEWLETT PACKARD 8640B-OPT 323 AN -117 THRU -LINE RF WATTMETER SOLID STATE SIGNAL GENERATOR /USM TRANSISTORIZED (w /o synchronizer) Frequency range: 450 KHz to 512 MHz, to DC-6, MHz OSCILLOSCOPE Frequency range: 2MHZ to 1100 Mhz with external frequency doubler option supplied. 1000MHZ. Power range: 10 Specifications: CRT Size: 21/2" x 2" Vertical Bandwidth, Watts Ten Frequency bands in octave increments from 500 KHz; to 1000 Watts. DC-6 MHc Sweep Ranges: .1 microsecond div. to 1 sec. - USWRs band 11 for doubler use. Accuracy: 6 digit LED read out 1.08 to 1. Uses Horizontal Bandwidth: DC -5W Hz - Power Input: 115Ví50 - Stability: < 1000 ppm. Output power: -145 dBm to +10 dOm three plug -in coupler ele- 1000 Hz/1 Ph - Dimensions: 8" x 9V4"W x 181/2"D )including ( 0. 013Vto2V) into 50 fl. Impedance is50fl,VSWR<2.0on2 ments, (included). CU -753 front cover) - 23 lbs. complete. Price: V and V range < 1.3 on other ranges >. Modulation: Internal Weight: $135.00 2 to 30 MHZ 50 to 100 Watts AM, FM and PM, external AM, FM and PM. Pulse frequency. CU -754 25 to 250 MHZ 10 to 500 Watts 0.05 to 5 kHz. General: Power Requirements: 100, 120, 220, CU -755 200 to 1000 MHZ 10 to 500 Watts 240 V, 48 hz to 420 hz, 2 amps. Size: 6" (H) x 19" (W) x 131/4" Connector: Type N. Case included. Size: 7"W (Dl. Wt. 601ós. Includes ruggedized case and manual, 64"H x 71/5"D Weight: 6.5 lbs. Price: $285.00 Price: $795.00 Current Hewlett Packard Prices: S12,050.00

HP MODEL 606B Signal Generator: Later version of 60M. Frequency range of 50 KHz to 65 MHz in size bands; accuracy *1 %. Output level is continuously adjustable from 0.1uV to 3V into 50 resistive Toad. Modulation COLLINS HF8050 SOLID STATE level of 0 to 95% on 1V attenuator range and below, 0 to at least 20% on 3V range SYNTHESIZED RECEIVER Price: $375.00 Freq: 250KHZ to 29.99999MHZ;10HZ steps thumb wheel tuning. TEK MODEL 7603N Modes: SSB, USB, LSB, CW, AM. B -W.: 2,7KHZ,16KHZ. Sensitivity: 0.7MV 10dB S + NM. Computer controllable. Oscilloscope: Mil Spec AN/USM -281C, 8 Squelch. Power:103 to 127U, 47 to 63HZ207 to 253V, 80 watts. 10 CM display, 100 mHz response which ac- Size: 7"H x 19" x 20.9"D. Wt: 42 lbs. cepts standard 7000 series Plug -Ins. Vertical Price: $2500.00 Plug -In: 2 ea. 7A15 (AM- 6565), frequency BW 75 mHz, maximum sensitivity 5mV /DIV. Horizontal Plug -In: 1 ea. 7853 (TD- 1085), triggering to 100 mHz, minimum, sweep - time 50 NS /DIV, has delayed sweep capacity. Includes cover probes accessories. Price: 095.00

Collins 6516 -1 synthesized, solid state HF receiver, AM, CW, GENUINE U.S. NAVY SSO, FM, ISB. Freq: 250 KHZ to 29.9999 MHZ.1MHZ, 0.1 MHZ, - 30 vacuum to +300 PSI Bronze Encased Gauge. 5V4" diame 100 CPS steps. IF filters: 16MHZ, 6MHZ, 3MHZ, 2.7 MHZ, 0.5 ter V4" male NPT. MHZ, No0.2. Input power: 115/230v, 47 to63hz, 70 to 110 watts. New Price: Price: $1,895.00 $85.00

ITT UHF POWER AMPLIFIER AM6155, GRT 22 JONES INSTRUMENT TACHOMETER DAYTON CAPACITOR MOTOR Frequency range: 225 MHZ K 399.95MHZ, Power Output: 50 Centrifugal Mechanical tachometer. Measures RPM scale to 5K504 V HP capacitor start 1725 RPM 115V, 60HX,1PH. Sleeve watts. Impedance: 5000HMS. Modulation range: 90% 5W RPM. Coupling shaft lb". Accessories: various size rubber bearings rubber mounted open, driporoof thermal protec- 10 %. Power Req: 105/120V210240 at 47 to 420 HZ, 610 watts toped drive couplings. tion nema 56 frame áb" dia. shaft 31/2" shaft HT. r,ac. Size: 5V4"1-1, 17V4V,181/2"D at 70 lbs. New Price: $75.00 New Price: $75.00 Price: $300.00 (818) 787 -3334 (800) 235 -6222 FAX (818) 787 -4732 120

CIRCLE 236 ON FREE INFORMATION CARD www.americanradiohistory.com L;Q.Lig,\E[ikl ©L-,),11, li_Lb... C & L ELECTRONICS * 90 DAY GUARANTEE * BUY - SELL - TRADE 10 Day Inspection Period Assoc. Research 5040 AT Hy Pot Tester 500.00 8UPPLV Datapulse 101 Pulse Generator 75 00 Fluke 332B DC Voltage Calibrator 800.00 "DEAL OF THE YEAR!" Fluke 540B -110 Transfer Standard 2,000.00 Fluke 721A Lead Compensation 500.00 WARRANTIED & GUARANTEED IN STOCK ITEMS Fluke 845A Null Detector 300.00 Fluke 887AB Differential Voltmeter 400.00 1 5 10 20 100 Fluke 895A Differential Voltmeter 350.00 REMOTES - NEW BATTERIES INCLUDED Fluke 931PB True RMS Voltmeter 400.00 Fluke 1953A Frequency Counter 450.00 Jerrold 550: Scientific Atlanta (Bik) with and without volume, Zenith Fluke 6160A Frequency Synthesizer 660.00 type or refurbished Slimline with new battery. GR 1615A Capacitance Bridge 1,200.00 All of the above $11 $10 $9 Call Call GR 1620A Capacitance System 2,000.00 HP 203A Function Generator 400.00 CLEARANCE- CLOSE OUT-ITEMS HP 334A Distortion Analyzer 600.00 THERE MAY BE NO RESTOCKING ON THESE ITEMS. HP 853A Display 2,000.00 HP 1725A Scope, 276MHZ 700.00 ONCE THEY'RE GONE, THEY'RE GONE! HP 1740A 100MHZ Scope 500.00 CONVERTERS W/BUILT -IN DESCRAMBLER IN CONVERSION MODE HP 3551A Transmission Set 750.00 1 5 10 20 100 HP 3456A Digital Voltmeter 900.00 Scientific Atlanta 8500/321 900.00 HP 3575A/001 Phase Gain Meter w /Remote Jerrold and SA compatible $110. $105. $100. N/A N/A HP 3575A/002 Phase Gain Meter 1,000.00 Scientific Atlanta 8530/320 . 450.00 HP 4800A/4801A . . Vector Impedance Meter w /Remote Jerrold and SA & SA HP 4815A w/Probe . . Vector Impedance Meter . 800.00 dropfield compatible $125. $118. $114. N/A N/A HP 5340A ...... Frequency Counter, 10HZ to 18GHZ . 1,000.00 CONVERTERS /DESCRAMBLERS RAW DC 100MHZ, 9 digit . . . 450.00 HP 5328A w/OPT 011 Counter, to Jerrold jSX -3 -DIC 36 Ch. 350.00 HP 606B Signal Generator 80% plus test good $14. $12. $9. Call Call HP 3325A Synthesized Function Generator . . 2,000.00 STRAIGHT CONVERTERS ONLY Automatic Synthesizer 800.00 HP 3330B .CONVERTERS W /BUILT IN DESCRAMBLER IN CONVERSION MODE Digital Multimeter 900.00 HP 3467A Logging 'Scientific Atlanta 8530/330 Selective Voltmeter 995.00 HP 3581C Basic SA & SA dropfield (Advanced SA) HP Noise Generator 1,250.00 3722A 6 db tipe Jerrold & Hamlin type 1,000.00 HP 3776B PCM Terminal Test Set compatible $135. $125. Call N/A N/A HP Transmission Test Set 1,500.00 4935A Panasonic Ch 3 w /Volume & 600.00 HP 4940A Transmission Test Set new Remote, Feature packed $55. N/A N/A N/A N/A HP 5345A Frequency Counter, DC to 500MHZ . 1,000.00 DECODERS ONLY Supply, 0-20V, 0-1A 225.00 HP 6111A OPT 0.5 Power Jerrold SB3 -DIC General Instrument Supply, 0-40V, 0-5A 225.00 HP 6112A Power original equipment Ch 3 w/xfmr/. X -Y Recorder 400.00 HP 7004B Raw tested and guaranteed $19. $16. $14. $12. $9.50 X -Y Recorder 250.00 HP 70158 Positive Traps Ch 2,3,4,16,23 $10. $9. N/A N/A N/A X -Y Recorder 500.00 HP 7044B REMOTES ONLY - All remotes come with new batteries. Graphics 300.00 HP 7225B Plotter Panasonic original $9. $8. Call Call N/A HP 8405A Vector Voltmeter 600.00 & Hamlin $9. $7. $6. Call N/A 300.00 Oak HP 8443A Generator (less cable) Pioneer original type $12. $10. Call Call N/A O- 1500MHZ . . . 2,000.00 HP 8558B Spectrum Analyzer, with Universal Programmable TV function Sweep Oscillator Frame 500.00 HP 8620C (for 5_& 6_series) New Frame 400.00 HP 8620A Sweep Oscillator CONVERSION KITS & CHIPS Storage Normalizer (less cable) . . . . 275.00 HP 8650A 'Zenith ZLI, 8500 310,320, 410, 420 3500 . . . 350.00 Krohn -Hite Filter Starco n 6 (not BB) $12. $10. $9. $8. Call 700.00 Krohn -Hite 7600 . . . Widehand Amplifier Tocom 5503 VIP, 5507, 5507VIP 375.00 Keithley 226 Current Source (no 2F series) $10. $9. $8. $6. Call 500.00 Keithley 247 ...... P.S., 0-3KDVC, 6MA 'Scientific Atlanta 2MHZ 600.00 Rockland 5100 Synthesizer, 8570,6580, 8590 8, 8600 Rod-L M25 Ground Tester 700.00 (40 pin micro controller) $45. $39. Call Call N/A Shalltronic 817C . . . . Decade Box, .01 to 100 Ohms 125.00 MISCELLANEOUS 200.00 TEK C59 Camera Zenith LED displays $3. $2. $1. Call N/A TEK S-4 Sampling Head 600.00 Zenith Remote Sensor Module $5. $4. $3. $2. $1. 300.00 TEK 1L60 Spectrum Analyzer Zenith S imline Remote, Iront bezel inlay $1. Call Call Call Call . Scope, 100 MHZ 650.00 TEK 465 w/DM44 'Zenith CDsmetic Repair Parts Call Call Call Call Call Scope 100 MHZ 850.00 TEK 465B OPUS . with TV, Call to- specifics NTSC Vectroscope 1,000.00 TEK 520A Zenith decoder board 165 type 1,800.00 TEK 576 Curve Tracer 220W tested and guaranteed $19. $15. $12 Call Call Differential Comparator LED 400.00 TEK 7A13 Torq bts, T7 (Tocom), T10 (Hamlin), Differential Amplifier 500.00 TEK 7A22 T15 (Zsnith),T20 Scientific Atlanta & Amplifier 500.00 TEK 7A24 Pioneer and T25. -In, 750.00 TEK 7A29 Plug 1GHZ All above are security type $6. $4. N/A N/A N/A Time Base 500.00 TEK 7B15 ',CB Radios, broken linears, SSO, CBs, . . 300.00 TEK 7B53A OPT05 . Plug -In base mobile's, antennas, microphones, TEK 7CTIN Curve Tracer, 0.5W 400.00 Call TEK 7D20 Programmable Digitizer 1,500.00 TEK 7L5/L3 Spectrum Analyzer 2,200.00 Payment Methods: Credit Card, Pre- payment or COD Spectrum Analyzer, 1KHZ to 1.8 GHZ 2,850.00 TEK 7L13 Sales & Technical Assistance: TEK 1480R Waveform Monitor 1,000.00 TEK 2901 Time Mark Generator 350.00 PT (407) 788 -6277 TEK 7844 Dual Beam Scope, 400MHZ 750.00 12-5 P.M.. M -F EST No Holidays Velonex 510 Transient Generator 1,000.00 FAX: 24 HRS. (407) 788 -9087 Power Factor 600.00 Yokogawa 2524 Meter NO FLORIDA SALES OR ORDERS WANTED! Will Pay Within 24 Hours! Test Equipment If you plan to steal cable, do us both a favor, don't waste your dime and my time.. P.O. Box 52153 Fax (215) 215 426 -0177 Because Z -Mann Cable Supply does not assist any company or any individual in Philadelphia, PA 19115 464-5856 ülis jUggei áctivily; 121 - ..... -.

CIRCLE 173 ON FREE INFORMATION CARD CIRCLE 171 ON FREE INFORMATION CARD

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ADD ON DESCRAMBLERS ZENITH 1 -5 6 -10 Features FTB-3 49.00 39.00 Wireless Remote Control 550mHz (99 Channel) capacity TVT OR TBI 55.00 47.00 Volume Control SA-3 59.00 49.00 Parental Lock -Out KN12-3 59.00 49.00 Programmable Favorite MLD1200-3 49.00 39.00 Channel Memory CONVERTERS 1 -5 6 -10 PANASONIC 1453G 79.00 69.00 JERROLD DQN7 -3 75.00 65.00 STARGATE 2001 75.00 65.00 Call for other models

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MICRO -SCOPE Universal Computer Diagnostics was developed to satisfy the /l This is the only card that will function in every system on the market. The expanding need for accurate system diagnosis in the rapidly growing desktop 1 documentation is extensive, and not only covers the expected POST computer market. Codes for different BIOS versions, but also includes a detailed reference to the bus signals monitored by the card." -Scott Mueller from his globally recognized CACH MEMORY -"Micro Scope" Ver. 5.0 now fully tests cache book, 'Upgrading & Repairing PCs, Second Edition' memory and the cache controller subsystem. LOW LEVEL FORMAT Ability to do fac- Includes pads for voltmeter to attach for tory style initialization of all IDE drives, actual voltage testing under load. together with the ability to do factory 4 LEDs monitor +5vdc -Svdc style low level formatting on all drives, +12vdc -12vdc. including MFM, RLL, ESDI, SCSI and all Monitors Hi & Lo clock and OSC cycles IDE drives. to distinguish between dock chip or crystal 0/S INDEPENDENT -Does not rely on failure. OIS for diagnostics. Talks to PC on a hard- Monitors I/O Write and I/O Read to ware level regardless of the 0/S or CMOS distinguish between write and read errors. setting. Monitors memory write/read to TRUE HARDWARE DIAGNOSTICS - distinguish between address line failures Accurate testing of CPU, IRQs, DMA, and memory chip failures. video memory, hard drive, floppy drive, Monitors ALE for proper CPU/DMA cards, etc. operation. DISPLAY DRIVE TYPE-Reads and dis- Monitors Reset to determine if reset is plays the actual drive parameters for any occurring during POST, indicating short. drive type automatically. Monitors progress of POST without POST codes. CPU DETERMINATION-This capability is nec- Reads POST codes from any IBM or compatible essary for accurate system diagnosis on 386SX, that emits POST codes. ISA /EISA/MCA. 486DX and 387 and 487 chip implementations. Compatible with Micro Channel computen. Because each of these specific chips has its own Dip swixh allows easy selection of I/O ports to read. unique instruction set, and therefore cannot be accurately diagnosed with any Includes tri -state LOGIC PROBE to determine actual chip failures. program which cannot recognize these differences! Manual includes chip layouts and detailed POST procedures for all major MEMORY FIST-- "Micro- Scope" 5.0 has no limitations as to the size of memory BIOS's. it can accurately test. Micro-Scope now also tests VIDEO MEMORY (up to 2 MB)!! MEMORY EXAMINE- Displays any physical hit of memory. Very useful for This is the ect package determining memory conflicts. Very useful for determining available memory space. for all technicians BATCH CONTROL-All tests, even destructive, may be selected for testing. and self- maintainers. ERROR LOGGING-Automatically inputs errors during testing to an error log. AUTOMAPPING- Automatically bad sector maps errors found on hard disks. Call MICRO 2000, Inc. for volume IRQ DISPLAY- Shows bits enabled in IRQ chip for finding cards that are software driven. (Network, Tape Backup, etc.) discounts and after sales service! IRQ CHECK -Talks directly to hardware and shows I/O address and IRQ of *1-800-864-8008 devices that respond. SECTOR EDITOR-Allows the editing of any sector of floppy or hard disk 1100 E. Broadway, Suite 301 media (even track M. Glendale, California 91205 AND MUCH MORE...We don't have enough space here for everything this software can do! 818 -547 -0125 Fax 818 -547-0397 123 CIRCLE 304 ON FREE INFORMATION CARD

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ETCHING TANK ETCHING CHEMICALS This attractive injection moulded designed tank is FERRIC CHLORIDE ideal for etching your PCBs. It includes a A dry concentrate that mixes with water to thermostatically controlled glass heater, electric make 1 pint of etchant, enough to etch 400 agitator and PCB hanging accessories. Measuring sq. inches of loz board. graduations are included. Maximum PCB size is PRICE EACH 160mm x 250mm or 200mm x 250mm w/o heater. CAT NO DESCRIPTION I 5 Typical etching time is 4 minutes. ER -3EN Makes 1 pint $3.50 $2.75 CAT NO DESCRIPTION This l- ET1OEN Etch Tank System product DEVELOPER aced as the developer on our positive photo -resist printed circuit boards. Includes instructions. 50 gram package, mixes with ' water, makes 1 quart. PRICE EACH POSITIVE PHOTO RESIST CAT NO DESCRIPTION 1 10 25 POSDEVEN Positive Developer $ .95 $ .80 $ .50 PRE - SENSITIZED PRINTED CIRCUIT BOARDS 486 CPU COOLER These pre- sensitized printed circuit boards Increase are ideal for small production runs. They Performance! Prolong Life! provide high resolution and excellent line COOL IT! With our easy to install width control. High sensitive positive resist miniature CPU Cooler Fan. This kit includes an coated on loz. copper foil allows you to go omni -directional heat sink, long -life, low direct from your computer plot or art work noise, DC fan with ready to go power hook -up. The -cost, layout. No need to reverse art. best low high add- on value investment you can make! Single- Sided, los. Copper PERFORMANCE Typical 80486-33MHz CPU Foil on Paper Phenolic Substrate surface temperature reduces from approximately PRICE EACH 79 °C to approximately 48 °C. Typical 80486 -50MHz CAT NO DESCRIPTION 1 10 50 CPU surface temperature reduces from approximately PP101EN 100mm x 150mm/3.91" x 5.91" $2.55 $1.90 $1.70 95°C to approximately 54 °C. PRICE PP114EN 114mm x 185mm/4.49" x 7.28" 2.98 2.45 1.98 CSI PARTt 1 5 PP152EN 150mm x 250mm/5.91" x 9.84" 5.40 3.98 3.60 CC -M3EN $15.95 $14.95 PP153EN 150mm x 300mm/5.91" x 11.81" 6.15 4.48 4.10 Single- Sided, loz. Copper Foil on Fiberglass Substrate PRICE EACH CAT NO DESCRIPTION 1 10 50 GS101EN 100mm x 150mm/3.91" x 5.91" $ 3.90 $2.98 $2.60 WANT MORE INFO ON THE GS114EN 114mm x 185mm/4.49" a 7.28" 4.80 3.49 3.20 GS162EN 150mm a 250mm/5.91" x 9.84" 8.69 5.98 5.78 SOUTHERN CROSS? GS163EN 150mm x 300mm/5.91" x 11.81" 10.20 7.20 6.80 Double -Sided, loz. Copper Foil on Fiberglass Substrate Use our FaxBack Automated Document Retrieval System. Dial PRICE EACH 1 -800- 662 -5426 (602- 834 -1005 in AZ) and select document CAT NO DESCRIPTION 1 10 50 #5025 on your push -button phone. You'll receive an article GDIOIEN 100mm x 150mm/3.91" x 5.91" $ 5.07 $3.68 $3.38 reprint from Australia's 'Silicon Chip" magazine, reviewing the GD114EN 114mm x 185mm/4.49" x 7.28" 5.95 4.29 3.99 GD152EN Southern Cross SBC. This is a free service available 24 -hours a 150mm x 250mm/5.91" x 9.84" 10.47 7.39 6.98 Don't GD153EN 150mm x 300mm/5.91" a 11.81" 11.95 8.69 8.30 day. forget to have your FAX# handy.

21 hex digit keypad, then progress to using a PC SC1EN Southern Cross Kit $ 1 45.00 Iis Assembler provided with many program examples. La Serial download assembled program from SC2EN Assembled $ 1 85.00 PC to Southern Cross. Serial interface provided. SC4EN 8 x 8 Board Simple, but powerful monitor program fully $49.00 annotated. Learn to use of it in parts your own SC3EN Relay Board -1 relay $27.00 atose programs by 'system calls' & using a 'header file', SC13EN Kit to complete relay Learn how to single step through your program board -7 relays plus to components $19.95 3 t QIiIllO find errors. Both hardware & software single stepping provided & explained. D81213BEN SmartSocket $18.00 We do not fill the User Manual with pages of THE SOUTHERN CROSS theory. Go straight to program examples. Starts DS1216BEN SmartWatch $36.00 from a very basic level anyone can follow. Intelligent Eprom Emulator A Single Board Z -80 -Based Computer The Southern Cross system Includes: Full explanation of how to construct & use Here is a single board computer designed All CMOS IC's It. Uses 5IC's & 8748 uC. Emulates 8K, 16K & especiallyforthe 1990'sgenerationofstudents. Hardware speed control 32K EPROM. Recognizes binary & Intel hex With aseries of add-on boards, smartsockets, 8K EPROM files in software. Connects to printer port 1 fullycommented monitor &anintelligentEPROM 64K RAM or 2 on a PC. Reset sent in software before emulator, it can teach manyaspects of micro- 4.00MHz Z80 file transfer. /F switch fills unused emulated 10 year RAM with ROM with any hex byte. Powered from processor & micro-controller techniques of backup optional DS1213B Calendar /time access & RAM backup with target system. Cables Included. Small 4.5' programming. optional DS1216B x 2.3" double-sided, PCB with overlay. Many 9 -15V AC /DC Single -sided PCB 9.75' x 5.15" examples provided on floppy disk. The Southern Cross SBC is designed to teach beginners modern code development tech- Two add-on boards available. Relay Board to SCSEN Kit $ 79.00 niques as well as assembly language. Start connect to real world of lights & motors and 8 x with machine language using the on -board 8 LED module Board to write moving displays. SC6EN Assembled $94.00 124

CIRCLE 294 ON FREE INFORMATION CARD www.americanradiohistory.com Circuit Specialists, Inc. Always Neu! Neuer Surplus! Toll -Free 800-528 -1417 In Arizona 602 -464 -2485 FAX 602 -464 -5824 Our phone operators are on duty from 8:OOam- 6:OOpm MST EDUCATIONAL PROJECT KITS These kit designs are fully tested & guaranteed to work! They are designed to provide General Purpose 4 -1/2 Digit educational value as each kit includescomplete documentation, ()schematic diagram Frequency Counter with LCD and a short discussion on the theory. All of the circuit boards are made from 1.6mm General Purpose 4 -1/2 Digit Counter uses INCLUDING fiberglass. They have been silk-screened on the top to aid in component placement and Harris 7224 IC. Full Instructions are the 7224 data sheet is included. All pins the backs have been soldermasked to aid in soldering. The solder pads and traces from the 7224 are brought out for easy on the large side to help withstand rough access. Directly drives an LCD (provided). handling. Sound Activated Switch for This project is a building block that you can High Quality Educational Project Kits use as part of a larger project. The LCD Tape Recorder section can be cut away and connected Excellent Documentation Can be adjusted to turn on your tape by a flat ribbon cable. The Kit has its own 5V Each Kit Includes a Schematic Diagram recorder through its REMOTE plug. Has regulated supply on board for the 7224, A Circuit Description and Theory feedback and delay circuit for robust allowing a relatively wide range of voltage Discussion Included operation. Very sensitive. Proven circuit. Inputs from +6V to 10V. The Harris 7224 counts Needs 6V plug pack for most stable up to 15MHz, guaranteed, 25MHz typical. PCB's are Rugged 1.6mm Fiberglass operation. PCB's are Silk Screened on Top to Aid in CAT NO PRICE CAT NO PRICE Component Placement KIT 13EN $9.95 KIT 36EN $42.00 PCB Pads & Traces are Oversized to Protect Against Rough Treatment Faulty Components will be Replaced 6V Tape Switch for Telephone Intro to Microcontrollers FREE of Charge Record your phone conversations. Turns Learn to program microcontrollers without tape recorder on when the handset is lifted. going to technical college. This Kit Three Digit Panel Meter and Easy to connect to your phone line. Plugs introduces the Motorola 68HC705K1, an 8 into REMOTE & MIC jacks of your tape bit, 16 -pin microcontroller released in 1992. Counter Module recorder. Best for 6V tape recorders. The Kit is a down counter from 60 or 90 Basic low cost counter. Two or more counter Educational Kit, not for illegal use seconds with beeps every 10 seconds. All i modules may be plugged together with 6- CAT NO PRICE the software code is supplied and fully is to pin sockets & harness provided. Uses a KIT 15EN $9.95 explained. See how easy it change the single -unit 3 -digit LED display. Built around time and beep settings by simple changes the 14553 & 14551 chips. Box & battery In the software program. You can judge for provided. The separate COUNTER MODULE yourself how using micro-controllers is a shows how to use the Kit as a counter. Has FM Telephone Transmitter huge advance over using logic ICs. On /off COUNT & RESET switches with debounce Miniature transmitter which attaches in switch and pulldown resistors on input lines circuit built in to eliminate problems from series to one of the two lines to your are all built into the K 1 and are under noisy switches. 9V battery operation. telephone. Transmits over 200 meters to an software control. 9V battery powered. CAT NO PRICE ordinary FM receiver. Transmits further if the how to continue KIT lEN $19.95 FM receiver is near the phone line. Tune with All the information about ceramic trim cap. Uses the phone line as an learning to program these 'computers-on- aerial and power source. Not for illegal use. a-chlp' is supplied. The tools to program very low cost (under CAT NO PRICE the K1 are available at $200) from Motorola. The K1 is the simplest Introduction to a Power Supply KIT 16EN $8.95 Batteries soon become an expensive way 8 -bit microcontroller available. to power your electronic kit and electronic CAT NO PRICE games. This Is a basic power supply using KIT 38EN $38.95 two 7805 regulators. Input up to 20V AC Logic Probe from a transformer or power pack. Two This is the most important piece of regulated outputs -fixed 5V, the other equipment for testing and measuring digital variable. Box provided. Good introduction equipment. It is usually used in fault finding RECEIVE YouR to electronics. and testing, but can also assist in design FREE CAT NO PRICE work and to find out how digital equipment COPY OF OUR NEW KIT 4E N $12.77 works. Switch for either TTL or CMOS. Our own modern design using a PUT. Includes MM detection circuit for very fast pulses. Gives FALL/WINTER CATALOG visual (3 LED's) and audio (pieza buzzer) Our 100 -page catalog is loaded with electronic supplies and Introduction to LM3909. response. equipment! Semiconductors, Switches, Passive Devices, Continuity Tester & Long Life CAT NO PRICE Computer Systems, Test Equipment, Industrial PC KIT 24EN $10.88 Supplies, Printed Circuit Product, Heat Shrink, Wire... the Flasher list goes on and on! If you order from this ad, request that Most ICs operate in the 4V to 40V range. The a copy be included with your order. Or just fill out the LM3909 from National Semiconductor catalog request coupon below and mail it in. .S1oil Your changed this Two PCBs supplied. A 1.5V D Fiber Optic Audio Link Request to our Distribution Warehouse: cell will flash an LED for over two years. Use Allows you to send sound through plastic Circuit Specialists, Inc. as an imitation car alarm. A second PCB 1mm fiber optic cable. Matched 220 South Country Club Drive connects the chip as a 1.5V continuity tester. transmitter /receiver pair from Motorola. Two Mesa Arizona 85210 Seven pages of documentation provided circuit boards with a microphone at one from National Semiconductor. end and a speaker at the other. 14 feet fiber CAT NO PRICE optic cable supplied. Will work over 200 KIT 11EN $9.95 meters. I SAW YOUR AD IN ELECTRONICS NOW! CAT NO PRICE General Catalog. KIT 26EN $29.00 Please send me a FREE copy of your Send it to: m CT) Two Stage FM Transmitter Name o ATTN EDUCATORS: Our most powerful FM 'bug' to date. A two stage FM transmitter with an RF transistor Company Name its output stage. 9V Call for Special Kit (2N3563 or ZTx320) in Z operation. On /off switch mounted on the Address PCB. Prices on Quantities CAT NO PRICE City State Zip KIT 32EN $9.95 of 10 or More. IMP L mil 125 CIRCLE 294 ON FREE INFORMATION CARD

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TALKING VOICE CHIP $11.50 BASIC STAMP You loved the talking clock and talking motion PAn1LLAX This Hals -else computer detector, but you hod your own ideas for runs BASIC!!! A 1X2 Inch opplicottons...Weli, now Gateway's got a progrom- gate single-boer) computer that eon run BASIC programs written an par PC. It features d ll1it.i I/O linos, wok program- moble voice chip so you can Incarporote the ELECTRONICS, INC mable as an Input or output, can sink 25mA en1 source technology Into virtually ony application! The 16 8123 PAGE BLVD ST. LOUIS, MO 83130 SOMA. The BASIC proven, are Hared In EEPROM, se they second addressable IC (sampled at on 8kHz rote) (314)427 -6116 eon is cliental' is often as pou like, ad As slap!. BASIC o switch, requires only o speoker (12mUJ output), 9222 CHESAPEAKE DR. SAN DIEGO, CA 92123 IneluJu instructions for salol eonnunieations, voice messoge (up to language and o microphone to store your (619)279 -6802 PWM, potentiometer input, pulse neostrmalt, button 16 seconds.) The chip is reusable, chonge the 2525 FEDERAL BLVD. DENVER, CO 80211 Sebum, tow generation, ate. typical apptkatlo Imogene, o tolking pillow, messoge ogain and ogoini (303)458 -5444 Tiara is a snail prstotypia era a beer mug messoge minder, or even o talking T- shirts MAIL ORDERS CALL TOLL -FREE with spate for eonneeting signals and astre components, awl It runs on at INFRA -RED TRANSMITTER / RECEIVER KIT $5.50 1- 800 -669 -5810 S -I2 VDC or a 9 -volt battery) _ Originally a remote control alarm panic button this set FAX ORDERS (314)427 -3147 includes two hand -held IR units, modification Instructions to Maltipla stamps tin even Ito networkdIll - make either unit a receiver, an IR transistor a resistor, Ti. BASIC Hem is $39.00 and tie BASIC stamp Amigo, and two 9 volt batteries, (one of those great moments ELECTRONICALLY SPEAKING, kit (Aid includes I stamp plus all tie kerb /are, softwera, when you find out batteries are included, huh!) Just GATEWAY'S GOT IT ! end Menhirs necessary to program a stamp) Is $138.00. add a bell or buzzer, a relay, or whatever you want and 127 THERMOCOUPLES create your own remote control IR unit. You also get PELTIER JUNCTIONS 12.6 VCT 10 A TRANSFORMER' an added bonus, each unit includes stickers like the The pettier junction Is a solid - on the windows $14.50 ones alarm companies put of protected state thermwoltoic device. C t houses, (you know, this house is protected by...') applied to the device will produce heat This 3- 1/2"x3- 1/7'X4 -1/4" transformer is Makes a great single function remote control! on one side of the device and o cold great for power supplies and priced right! surface on the other side. Woter Stancor #P -8644. BLUE LEDs AM BACK! placed on the surface will freeze or maiiorder customers, please include $5.00 shipping/handling for For only $1.25 you can be the proud owner of a boil depending on polarity of this item. ' blue LEDI For $10.00, you can have 10 of theml applied voltage. Ideal for Teo- Talking Motion Detector H! grab Passive Infra -red $27.50 (That's a buck a plecel) No longer will you be forced terns from 3 -1 2 VDC - o Stay out of that refrigerator I', 'Watch your slap!' ... run to endure boring red, amber, or green Indicator and let your imagination wild! Tie possibilities ere mind- boggling wick tilo talking DOCUMENTATION INCLUDED!!! lightel The diffused LED is available in T -1 or notion ¿atarla,. You speak into it to record your blue Small Peltier Junction $20.00 message 12 seconds long), turn tie unit on, end T-13/4 sizes, and technical documentation Is (approximately 1.17' x 1.17' x .12') (apte soles your mother -in -lair) wolfish provided as well. That dream of a fourth color on Large Peltier Junction $29.50 Instantly you (or your Indicator panel Is now a reality. (approximately 1.56' x 1.56' x .15') anyone in tie vicinity that you ware expecting then. Message can be changed with the flip of a switch. Uses 4 AA batteries ULTRASONIC TRANSDUCERS 53.90 /PAIR (not include!), w en external power source (ballt -In jack). May Just what you've been looking for! Get both a transmitter and a receiver, as well as be used inbpadeatly (60 41 output) or wlti as amplifie) technical specs for both. Great for project builders! Used for range finding, remote speaker to blast year mass e tirougheat the hase. L. control, intruder alarms, and countless other applications. A rox 4's 3 -112"s S 131 THE FINE PRINT : PRICES SUEUECT TO CHANGE WITHOUT NOTICE GRTEU AY IS NOT RESPONSIBLE FOR PRINTING EMORS MRSFACARD, VISA AND DI ACCEPTED S 10 MERCHANDISE MINIMUM ON MRII ORDERS SUPPLY OF SO* ITEMS IS IMIED PRICES DO NOT INCLUDE SHIPPING UPS GAOLND SHIPPING/HANDLING tt.THII THE CONTINENTAL U.S. (ITEMS REQUIRING ADDITIONAL AMOUNTS AI* NOTED)...54.25 FOA THE FIRST ITEM, $0.50 FOR EACH ADDITIONAL ITEM RESTOCKING CHARGE MAY 8E I ASSESSED ON RETURNED ITEMS. A CLOSED MOUTH GATHERS NO FEET. l 127 CIRCLE 243 ON FREE INFORMATION CARD

www.americanradiohistory.com You are about to have the most 7 ascinating Software Experience of your ENTIRE LIFE! rsr EASY NEURAL NETWORKS Fastest way to quickly learn about this fascinating new technology - includes a working Neural Network CABLE TV you can train! $59 * * * * Converters & Descramblers EASY EXPERT SYSTEMS Build your own Expert System in about Compatible with one week! Includes 40 -Page Knowledge Engineering Manual, Quick Ref Card Jerrold, Scientific Atlanta, for quick start, and powerful Stock Market Expert System! $69 * * * * Pioneer, Oak, & Hamlin

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SUPER POWER MINIATURE IR TRANSMITTER UNIT RADIOSONDE Make all kinds of I R remote activated projects with this transmitter and an I R Very late model Radiosonde made for tracking all types of weather dala. These were to be sent aloft attached module. were originally designed to activate a burglar receiver These to a weather balloon (not included). Each is about 10' /2' long x 33 /x" thick x tt "wide. Inside of the removable system (which we don't have) by remote control. The alarm cardboard sleeve is e styrofoam chamber housing a sophisticated 8 IC circuit board which has sensors features a red activation button, a dip switch transmitter attached to measure atmospheric pressure, temperature and humidity. M it gathers the information, to change code, operation from inside output it transmits the data at about 1.677 gigahertz (GHZ). These are prime, brand new units that were battery (not included), red LED transmit 9V waiting shipment from the manufacturer (Space Data Corporation) to the governrrent when the indicator to stow when IR energy is being contract ended. These are complete except for the 24V battery (we connected two 9V batteries and a compact 41/4" x 13/16' transmitted x3/ in series and the unit worked perfectly from them). Sorry, no scherretic available. The 4" black stylish case. Brand newin blister pock G5535 main board contains the following ICs: 7555, CD4051, CD4520, LM324, 4151, with 2 peel and stick 'premise protected' $1.69 TLC27L (2 pa.) and a 76M15C voltage regulator. k also has the precision TO5 stickers. We also supply an into shoat that case pressure sensor, hygrislor sensorholder (with the hygristor(humidity) shows how to convert this transmitter unit into a programmable IR receiver so a pair of these sensor plats in a sealed container ready b insert into the holder), transmitter units could cover both transmit and receive functions. We have no knowledge of Cher mistor tor temperature measurements and now cone transmitter whether or not the into sheet is actuate, but we do know that this transmitter activates our antenna assembly. These cost the government a bundle to have G5076 IR receiver module (shown below) from over 50 it away. made but we are selling them at a giveaway price. Hurry, get your 2 for $3.00 12 for $15.00 120 tor $140.00 Radiosonde today! ))) SHARP GP1U5 INFRARED MODULE G5058 $8.95 Supersenstwinfaredmodrlebydmpisanly V('xV!"xr/a ".Tumsco ryLEDorlow voltage relayfrmomr50tt asrywtxn ycupessbWOroontheaboelrmniter. Has PERSONAL PERFORMANCE ony3hoekuppnawrdapereestron51o6VDC. Moduleardsknplehooby diaprant G5551 $3.95 MONITOR /HEART PULSE SENSOR G5076 $1.49 EA. 10/$14.00 We were told that these were the computers to be supplied on a skl type fhnessmachine (Nordic). We realty don't know for sure, but what we do know is a tour AA battergs (not included) and attach our IR LECVIR 10" THRUSTER WOOFER that you connect Sensor to the jack marked 'pulse- the unit win display your pulse in large hph 10 "wooferthe deeded brut:ending Vaned bonneted [the great sound of the grapy numerals on the large LCD display. Has all kinds of other data features such oB :Own or nee construction. We were told these were made by JBL (their model vour as age, sex, weight, resist, but we don't have the Info on how to use these or They Palm 6 ohm impedace, poly tom surround and a frecuexy response y210H). what other function the device can do. We do know that it has another Jade to from 25HZ 2KH1. MON: 2.5 bi Brand raw and w an incredible bbwal prim ! marked *speed. The LCD lights up whir MPH, calories, elapsed time, but who G3311 $15.95 EA. knows how to use these? We are selling these as an esglerimentor item only They lode very Interesting, but the only Info we have is how to construct the PAIR FOR $30.00 (INCLUDE $5.00 S &H) pulse sensor using our sensor and a stereo cable (these parts are not inducted) and Info on which button to push to cause the monitor to display your pulse. MAMMOTH LEDS Size of monitor: about 4- x 5 x 2 5/6'. Size of LCD display 1 3/4" if 2 a/6'

/These super large, ultra hph brightness leda are 10 mm in size and d:sigred for daylight viewing. Made by Toshiba with voter clear roes, long bads, ad high gialitybrilliet MIput. OPTIONAL IR LED /SENSOR (AS DESCRIBED ABOVE) G5668 690 These are sobride you car mete a miniature sold site eashlign. Hurry,the last time we hid I ...... :;;.:.:.;:.::..,:.:::.: .. . these theysoldadhd. IEE FLIP VACUUM :::::'...... , ...... :r' r ' l COLOR STOCK # TOSHIBA # PRICE FLUORESCENT MODULE intelligent display YELLOW G5560 TLYA190P This vacuuum fluorescent EleC7;f tit3.LLEMINPí r $2.00 module 16 large bright blue alpha- fatum 1 GREEN G5561 TLGC190P $1.80 numeric characters driven by a complete microprocessor controlled circuit . Dab input is e bit bidirectioral T1L -ASSCR dab bus or TR level G5633 $29.95 JUMBO TOSHIBA SCANNER ANTENNA serial input with one of 4 jumper selectable baud rates. Only a 5VDC supply is required for operation and display an be viewed in alrrost any lighting condition. Greatly sinpldies TLRC18OAP \ applications in alarm system, enemy management test equipment, point of sale termirwls, process control, remote data entry and ULTRABRIGHT RED LEtC hundreds of others. The display fatum seH -test mode, simple serial or parallel hookup and long life reliable operation. The EE part Jumbo! 13/4(5mm)clar case LEDprodtm number is 3700 -04 -016. We have the complete dala sheeUhcakup on these. Bard new and currently lits sell for about 6137.00 a brilliant red ouest In to 600 mcd). Them each from distributors. are top gallty, factory fresh, prime units with Standard 'sitter duck' style scanner wdeora wth long lads BHC camelor.Cown arigeof25Mte- 1,000Mh z. SUPER PC BOARD G5566 3/$1.00 Sin:4 ".Color:bled. ,\ /; BLUE T13/4 JUMBO LED Factory fresh Ti a/4 Blue LED features clear BLOWOUT +20W STEREO AMP KIT lens and long leads. We purchased these r 20W directly from the factory and are offering Two separate high power amps on ore PC bard. Each them to you at close to our cost to Ms dis own level wrerol are pus oil a incredible cap This is provide you with a new dimension for your chance to stock up on prime copper 20 watts RMS. Features red LEO 'on indicator aid lee G5067\ \ your projects. The blue LEO is made clad for making all types of custom PC boards. distortion circuitry. Grew stereo booster re for your car 790 from silicon carbide and can withstand Various sues: 2" a T' up to 6" a 6" or larger. This sound system Use wth wry speakers apdtle of handling up to 50mA current without damage. is high quality glass epoxy double sided copper I least 20 sobs. Operates on 12 VDC. Size of bard: 6" We have found that it looks best if operated close to a clad! x 2.22 ". Complete w1h all pads. PC board and 4VDC limit Very unique and colorful! G3500 50/$7.95 instddions $24.95 (Add an additiond 62.00 wire heavy shipping)

CIRCLE 241 ON FREE INFORMATION CARD 129

www.americanradiohistory.com CALL TOLL FREE 1- 800 -292 -7711 C & S SALES WRITE FOR 1- 800- 445 -3201 (Can) EXCELLENCE IN SERVICE FREE CATALOG Line Tracker Dual- Display Electronic Tool Kit Model TK -1000 '°. MV- 963n' LCR Meter A professional organizer tool kit at affordable prices. No is 4g9 $52.95 I w/ Stat Functions student should be without this unique tool kit that holds all the tools you need. ;, (Infra -red Sensor) B +K 878 -r Model Including: The robot follows .. - 9 $39.95 . ç -- M $239.95 Diagonal Cutter It a black line "' "'' "" .) Auto /manual range Long Nose Pliers -- on white paper . Many features 6" Wire Stripper ' Preassembled PCB with Q factor Solder 60/40 High Accuracy 6" Screwdriver i 6" Phillips Driver J " t j Robotic Arm Stereo Cassette Player Safety Goggles Qî Y -01 Kit IC Puller ' t 3pc Nut Drivers O $49.95 Model r - ' Iron 25W (Wired Control) TR -18K Iron Stand Movement grabs $16.95 Solder Wick ' & releases, cr Headphones Desoldering Pump lifts & lowers. Included 5 pc Solder Ease Kit pivots from side to side 6.c Precision Screwdrivers Digital Digital Digital Digital Function PdELB9 Multimeter Multimeter Capacitance LCR Meter Generator EDM -83B i. _- s. DVM -638 Meter ° LCR -680 ,. FG -801 $175.00 CM $39.95 -1555 $79.95 H hn $149.95 ( ' i T ' I Almost every .J' 1 11 Functions $49.95 3 -1/2 Digit Square, feature available _' with case _ :- - Measures capacitors a LCD Display Triangle9 y ó Bargain of Sine wave from 1 pf to 20,000µf Inductance the decade ® 1 uH to 20Mí2 Freq range 3 -3/4 Digit Multimeter Digital Frequency Counter Fluke Multimeters BK -390 Multimeter Kit F -1225 (All Models Available Call) _v4ó8.' $139.00 w/ Training Course Scopemeters 70 Series 0.1% DCV accy M -2665K 8 Digit LED display Model 97 $1,795 Model 7011 $69.95 Analog bar graph I Wide meas range 10 Series Model 7311 $97.50 Auto /manual ranging - Il $49.95 High sensitivity Model 10 $62.95 Model 7711 $149 Capacitance meas .±J' Full function 34 ranges Data hold function Model 12 $84.95 Model 7911 $175 Temperature probe Ideal school project Input impedance 1M52 or 50G 20 Series 80 Series M -2661 Assembled) $55.00 10:1 input attenuation function Model 2911 $175 Model 87 $289 Triple Power Quad Power High Current DC Wide Band Supply Supply Power Supply --- Signal ._ XP -620 .. ^ XP -581 mg BK -1686 $169.95 . Generators ByY Elenco t' a By Elenco 3 to 14 VDC Output - SG -9000 12A 13 BV /1--- $75.00 - .-_., $79.95 o - - For servicing high $124.95 3 fully regulated supplies, 1.5 -15V @ Four supplies in 2 -20V one unit; @ 2.5A, power car stereos, RF Frequency 100K-450MHz 1A, -1.5 to -15V @ 1A or 3 -30V @ 1A 5V © 3A, -5V @ .5A and 12V @ 1A. All camco ders, ham radios, etc. AM modulation of 1KHz Variable & 5V @ 3A Kit XP -620K $49.95 regulated and short protected Connect 2 or more in .arallel SG -9500 150MHz $239.00 Telephone Kit Function Generator Learn to Build & Program Digital /Analog Trainer PT -223K Blox Computers with this Kit Complete Mini -Lab For Building, $14.95 #9600 Testing, Prototyping Analog and Digital

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$15.95 Kit $26.95 rm.mlHR = -___ XK -525 Sine, Triangle, Square Wave Azixi " AM /FM Transistor Telephone Line . ®i r $159.95 ... Kit Radio Kit Analyzer I ;;;c MM -8000 _ XK with Training Course 000 ,- -525K By Elenco $129.95 Model AM /FM 108 ^^ $129.00 $27.95 I.S -- / From scratch you build a complete system. Designed for school projects, with 5 built -in 14 Transistor. 5 Diodes 1 supplies. Includes a function generator Easy to build because Our Micro- Master trainer teaches you to power schematic Is printed on the PCB t !- write into RAMs, ROMs and run a 8085 with continuously variable, sine, triangular, Makes a great school project Kit TT -400K $19.95 microprocessor, which uses similar square wave forms. All power supplies are Model AM -560 AM Only $17.95 Assembled TT -400 $26.95 machine language as IBM PC. regulated and protected against shorts. WE WILL NOT BE UNDERSOLD 15 DAY MONEY BACK UPS SHIPPING: 48 STATES 5% C & S SALES I N C . GUARANTEE IL RES 7.5% TAX ($3 min $10 mix) 1245 ROSEWOOD, DEERFIELD, IL 60015 rl FULL FACTORY WARRANTY OTHERS CALL FAX: 708 -520 541 -0085 (708) -0710 My"- - PRICES SUBJECT TO CHANGE WITHOUT NOTICE 130 CIRCLE 291 ON FREE INFORMATION CARD

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HITACHI POPULAR SERIES Elenco DS -203 20MHz, 10MS /s FLUKE SCOPEMETERS V-212 -20MHz, 2 Channel $425.00 Digital Storage Oscilloscope A handheld instrument that combines a V-222 - 20MHz, DC Offset $695.00 50MHz, 25MS /s dual channel digital storage V-422 - 40MHz, Dual Trace $849.00 oscilloscope with feature -packed 3000 count V -522 - 50MHz, Dual Trace $975.00 digital multimeter V -523 - 50MHz, Delayed Sweep $995.00 'Nadel 93- $1,225 $1 069.00 V -525 - 50MHz w/ Cursor 714a1 95 - $1,549 HITACHI COMPACT SERIES SCOPES 7/44eet 97- $1,795 V -660 - 60MHz, Dual Trace $1,375.00 Autoset, automatically - 60MHz, DT, w/cursor $1,449.00 V -665A sets voltage, time 8 trigger V -1060 - 100MHz, Dual Trace $1,549.00 Multimeter display, V -1065A - 100MHz, DT, w /cursor $1,695.00 2K Word Per Channel Plotter Output V -1085 - 100MHz, QT, w/cursor $2,125.00 3 -2/3 digits ( >3000 counts) 8 Bit Vert. Resolution 2048 Pts Hor. True RMS volts; AC or VC -6045A - 100MHz, Digital Stor CALL $749 Resolution Much More AC +DC up to 600V VC-6025A - 50MHz, Digital Stor CALL CALL TOLL FREE 15 DAY MONEY BACK GUARANTEE C &S SALES INC. FULL FACTORY WARRANTY 1245 ROSEWOOD DEERFIELD. IL 60015 1- 800 -292 -7711 ALL PRODUCTS ARE FACTORY NEW FAX 708 -520 -0085 (708) 541 -0710 1- 800 -445 -3201 (Can) PRICES SUBJECT TO CHANGE WITHOUT NOTICE 131

CIRCLE 291 ON FREE INFORMATION CARD

www.americanradiohistory.com Learn MICROCONTROLLERS and EMBEDDED SYSTEMS with the AES -10 Only offered in kit form. Some hardware assembly (wires, enclosure, etc.) is The AES -10... a complete learning 0 v a,N required. Kits are presoldered but a system, a complete embedded s/ ,' soldering gun is necessary. A PC is not control system.Extensive manuals s/ necessary. For back -up purposes only. guide you through your 8051 M ' ii Presoldered Kit $149. development project. Assembly, 41= ,t¢t,* t BASIC, and C programming. All hardware details, Blank Cartridges $14. complete schematics. Learn to program the LCD, keypad, digital and analog I /Os for your applications. 80C32 Computer/Microcontroller board with: Cellular/DDI Box Software

32K ROM , 32K RAM 5 MEGS zipped files including: 2 by 16 Liquid Crystal Display Complete book on disc 4 by 5 Keypad Plans for an ESN/NAM /"snatcher" for under $400 Digital, A/D , D /A, and PWM, I/O Motorola & Mitsubishi programming software Built in Logic Probe Specfic ESN info on various models Power supply, (can also be battery operated) Info on cellular "fingerprint" Extended AES BASIC and AES Monitor in ROM All peripheral topics Built -in routines for LCD, Keypad, Explanation of 9122 Motorola A/D, D/A and Digital I/O ports Revision and how to defeat it See 80C32 registers while you Step Wargames dialer and lots more! See all memory locations and data on LCD See memory contents in dec. hex. and binary FREE with Order! Access 200b Universal only $49. RS -232 cable to connect to PC for programming Garage Dour Remote. Opens up to 95% of 8051/52 DOS Cross Assembler garage doors and security gates. Uses 12v Program disks with well documented examples automotive power. For research purposes only. Access 2000.... $39 User's Manual, Language Manual, and Text Crystals $10 9 Contact Mark M -F -5pm S &H $5 $365 , Money Back Guarantee C.O.D. add $5 Free Brochure, M/C Visa (805) 486 -1940 800 - 730 -3232 INNOVATIVE ELECTRONICS Send S.A.S.E AES 714 - 744 -0981 for catalog 1407 North Batavia Street, Orange, California 92567. USA Fax 714 - 744 -2693 3410 Frankfort Ct., Oxnard, CA 93033

ATTENTION CABLE VIEWERS

CABLE VIEWERS.. .get back to your BASIC Cable Needs Call 800- 577 -8775 For information regarding all of your BASIC cable needs. 5 GOOD REASONS TO BUY OUR FAR SUPERIOR PRODUCT PRICE rjr EFFICIENT SALES AND SERVICE WE SPECIALIZE IN 5, 10 LOT PRICING ALL FUNCTIONS SSA, JERROLD, PIO, CONVERTERS, ETC.) ANY SIZE ORDER FILLED WITH SAME DAY SHIPPING

We handle NEW equipment ONLY - Don't trust last year's OBSOLETE and UNSOLD stock! BAS C COMPETITIVE PRICING- DEALERS WELCOME ELECTRICAL SUPPLY & HOURS: Monday -Saturday 9 -5 C.S.T. It is not the intent of B.E.S. W. to defraud any pay television operator an we will not assist any company or individual in during the same. WAREHOUSING 'Refer to sales personnel for specdicanons. CORPORATION P.O. Box 2165 Hanover Park, IL 60103 800 -577 -8775

132

CIRCLE 289 ON FREE INFORMATION CARD

www.americanradiohistory.com Electronic and AMAZING Scientific Products Mystery Levitating Device! Remember War of the World? Objects float in air and move to the TV & FM Joker / Jammer touch. Defies gravity, amazing gift, conversation piece, magic trick or Shirt pocket device allows you to totally control and remotely disrupt TV great science project. or radio reception. Great gag to play on family or friends. Discretion ANTI K Easy to Assemble Kit I Plans $19.50 required. EJK1KM Easy to Assemble Electronic Klt $24.50 Laser Ray Gun INFINITY TRANSMITTER ++ Visible Beam Laser Room Monitor I Phone Line Grabber High brightness red HeNe laser visible for miles. I ALL NEW! The Ultimate in Home or Office Security & Safety! Produce your own light show! Projects a visible beam of red lite clearly Simple to Use! Call your home or office phone, push a secret tone on visible in most circumstances. Can be used to intimidate by projection A. premises your telephone keypad to access either: On sounds and of a red dot on target subject. Also may be used to listen in using our in for voices; or B. Existing telephone conversation with break capability laser window bounce method h1LLIS1 below. Easy to build module emergency messages. CAUTION: Before assembly or use, check makes A working visible laser! may require legalities with your state Attorney Generals office as you LASIKM Kit w11mw Laser Tube, Class H. .$69.50 'beepers' or other 3rd party alerts. LAS3KM Kit w12.5mw Laser Tube, Class IllA $99.50 DANGER TELEGRABI Plans Only $10.00 'NVISIet1 LASER RADIATION Kit $99.50 AVOID EYE OR SKIN EXPOSURE TELEGRAB1K /Plans TO DIRECT OR SCATTER RADIATgI CUSS IV LASER PRIMA/CT Ultrasonic Blaster project produces a burst of light energy capable of burning Advanced Laboratory source of acoustical shock in most materials. Hand -held device uses rechargeable batteries. holes waves. Blow holes in metal, produce "Laser Bounce" Listener System either a neodynium glass, yag or other 500 joules of flash energy excite 'cold" steam, atomize liquids. Many ^'. Allows you to hear sounds from an area via a lite beam reflected from a laser rod. This is a dangerous CLASS IV project (individual suitable 3' cleaning uses for PC boards, jewelry, window or other similar objects. System uses our ready -to-use LATR1 available). parts/assemblies coins, small parts, etc Laser Terminator gun site as the transmitter. The receiver section is LAGUN1 Plans $20.00 ULB1 Plans $10.00 ULB1K Kit/Plans $69.50 supplied as an easy -to-build kit, including our cushioned HS10 LAGUN1K Kit/Plans Price on Request headsets. WST2 Plans $20.00 100,000V Intimidator / Transmitter Receiver $199.50 Extended Play WSTIK Kit of Both and Shock Wand Module LLIST20 Assemble with Laser Gun Site $299.50 Telephone Build an electrical device that is affective up to 20 feet. May be *3mw Visible Red Pocket Laser enclosed for handheld, portable field or laboratory applications. ®®0 Utilizes our touch power control! Recording System ITM2KM Easy -to-Assemble Electronics Kit $49.50 VRL3KM Kit I Plans $74.50 READY TO USE Automatic* controls and records on our X -4 TM2 Plans only, credit-able to kit $10.00 extended play recorder, taping both sides of a telephone conversation. Electronic Intended for order entry verification. Check your local laws as some ,\j % tl% Hypnotism states may require an alerting beeper. I_ - TAP2OX Ready to Use System $129.50 Puts subjects under control using hghly effective electronic stimuli. Intended for parties and entertainment but must be used with caution, Includes valuable text book reference and plans. EH2 Plans and Text Book $1950 Jon Ray Gun L Force Shocker Field/ Projects charged ions that induce shocks in people and objects without Pocket Sized Night Viewer any connection! Great science project as well as a high tech party Low Level Starlight A Vehicle Electrifier Uses prank. I0G3 Plans $8.00 to See in the Dark! Neat little device allows you to make hand and shad( bails, shock IOG3K KIVPIans $69.50 Low Cost wands and electrify objects, charge capacitors. Great payback for Ultra-Hi Lite Amplification! those wise guys who have wronged youl Invisible Pain Auto Brightness Control SHK1KM Easy to Assemble Electronic Kit $24.50 Limited Amount Available CA) Field Generator Made in USA light surveillance Animal studies, etc. Shirt pocket size electronic Can be used to fly an airplane or drive a car! device produces time variant PKV7 Plans $15.00 complex shock waves of intense directional acoustic energy, capable of PKV7K Easy to Assemble Kit Price on Request warding off aggressive animals, etc. PKV70 Ready to Use Price on Request IPG7 Plans $8.00 IPG7K KiVPlans ...$49.50 IPG70 Assembled $7450 ìá?_.' s 3 Mi FM 7.e. 1000 Ft ++ Wireless Microphone Pulser Subminiature! Crystal dear, ultra sensitive pickup transmits voces and Blaster Potato Cannon sounds to FM radio. Excellent for security, monitoring of children or Pocket -sized wand produces 100,000 watts of power for personal NOTA TOY. Uses electronic or piezo invalids. Become the neighborhood disk jockey, or go "under cover defense, field and lab use, etc. BLS3 Plans $10.00 igniton. CAUTION REQUIRED! using our sunglasses FM radio (see catalog). PMV1 Plans ... $7.00 BLS3K Kitt Plans $69.50 POT1 Plans FMVIK Kit and Plans $39.50 Product) (Dangerous $10.00 SUGL10 Sunglasses with built in FM Radio $29.50 Homing I Tracking Transmitter Beeper device, 3 mile range. Telephone Transmitter - 3 Mi

HOD1 Plans HOD1K Kit 1 Plans $49.50 FireBall Gun Automatically transmits both sides of a telephone conversation to an FM

Shoots flaming ball - two shot capacity radio. Tunable Frequency Undetectable on Phone Easy to Build Listen Through Walls, Floors Great for special effects and remote and Use Up to 3 Mile Range Only transmits during phone use. Highly sensitive stethoscope mike. fire starling CAUTION REQUIRED! VWPM7 Plans $7.00 STETH1 Plans...... $8.00 STETHIK KIVPIans $44.50 FIREBALL Plans (Dangerous Product) $10.00 VWPM7K KIVPIans $39.50

CATALOG Order by Mail Dept ENS16, Box 716, Amherst, NH 03031 With many or by 24 Hour I T14T1CV more items! Orders-Only Phone Phone: 603- 673 -4730 FAX 603- 672 -5406 Free with Order or send SI PAH Please $5.00 Shlppng S Handling 800 -221 -1705 -' "'UNLIMITEDirD MC, VISA, COD. Checks accepted add 133

www.americanradiohistory.com CELLULAR TELEPHONES

* CELLULAR HANDBOOK $ 59.95

* MOTOROLA CELLULAR SOFTWARE ;199.95

ISHI, PANASONIC, HITACHI, $299.95 NEC & NOKIA SOFTWARE

We also sell new reprogrammed celÌular phones (car mount, bag and handheld) or send us your second telephone and we will reprogram it to your current number. We also sell programming cables for all the above phones. Call us for pricing CELLULAR LINK 9859 II--1 -10W, SUITE 257 * SAN ANTONIO, TEXAS 78230 PHONE (210) 697-9544, FAX on demand (210)699 -9640 Unlimited Technical Support * Book and Software sold for Educational purposes only

CIRCLE 293 ON FREE INFORMATION CARD

NOW YOU CAN "SEE" INVISIBLE FIELDS 852 Foster Avenue AND A VOID THEM Bensenville, Illinois 60106 Most homes and offices Phone (708) 350 - 9510 Fax (708) 350 - 9760 have hot spots with strong artificial electromagnetic PRINTED CIRCUIT BOARDS fields, where chronic SINGLE -SIDED, DOUBLE -SIDED, exposure may cause mental or physical problems. Even the EPA names these MULTI- LAYER(4 -8 LAYERS) AND fields as suspected carcinogens. You can reduce your FLEXIBLE PCB PRODUCTION risk by avoiding these high -field areas. UNBEATABLE PROTOTYPES! The TriField m meter detects Jar more of these fields than any other electromagnetic pollution meter. It's the only one that independently. PREMIUM DELIVERY AVAILABLE reads AC electric fields, AC magnetic fields, andradio /microwaves. It also reads field strengths in all directions simultaneously. Every other meter 24 HR SERVICE ON SS & DS that sells for under $500 reads only magnetic and only in one direction - 72 HR SERVICE ON MULTI -LAYER they can entirely miss a magnetic field unless pointed correctly and are blind to radio /microwaves and electric fields, both of which cause biological ARTWORK GENERATION / EDITING effects. PHOTOPLOTTING SERVICES The TriFiokf meter reads all three types of fields numerically and with ASSEMBLY SERVICES a SAFE /BORDERLINE /HIGH SCALE, weighted proportional to effect on the body. Thresholds are based on epidemiological and laboratory 24 HR. ON -LINE MODEM studies. (While no absolute hazard thresholds have been established, 19,200 BAUDE, (708) 350 - 9761 reduction of relative exposure is prudent.) FOR QUICK & COMPETITIVE PRICING, The TriFieldr" meter comes ready -to -use with battery, instructions, and one -year limited warranty. The cost is $144.50 postpaid. ' OR MORE INFORMATION, PLEASE CALL US TODAY! Alphalab, Inc. 1280 South Third West / Salt Lake City, UT 84101 -3049 For literature and information, call (503) 543 -6545 QUAIL= 1IZ DIM c AUPII? 1K. CONCERN 134

www.americanradiohistory.com THIS MONTH AND HERBACH RADEVAN ORDERS ONLY 800 -848 -8001 COMPANY C /tOdUCts ¿on Seiellee and 9ildusttfy OFFICE AND TECH 215- 788 -5583 18 CANAL ST P.O. BOX 122 - BRISTOL, PA 19007 -0122 FAX 215- 788 -9577 PORTABLE COLOR TV CAMERA ECONOMY PRICED STEPPER MOTOR CONTROLLER KIT LASER POINTER For 6 thru 30 VDC OPERATION HITACHI MODEL GP -7 (NTSC) 3 mW OUTPUT POWER Kit contains all necessary components to construct this versatile device. Will High quality camera . .. ideal for studio, station,school, operate 4 phase motors with current computer use with color frame grabber. Compatible with ratings up to 1.25 AMPS per phase VCR's, color monitors, and with TV sets using an RF modulator. Pen sized class IIIA pointer. Features output continuous. Controls for direction, With color temperature adjustment, standard 1/4 -20 tripod power 3mw. Beam diameter at 20 Ft. 10mm. single step, hold, half -step, full -step thread and carrying handle. These cameras are removed Visible to 150 Ft. Operating time - up to 8 hours and wave drive step sequences. Speed from service, but fully checked before shipment. of continuous use. Convenient momentary pen control from 1 to 1500 PPS. LED's indicate phase sequence. from a battery or power supply. Includes a 12 7.5° REQUIRES A STANDARD 1" C -MOUNT LENS WITH clip switch for operation. Dim 1/2" dia x 5 -11/ Operate motor for demonstration purposes. ADJUSTABLE IRIS. 16" long. 90 day mfgrs limited warranty, Shpg Wt. 1 lb. Batteries included. RE93KIT2421 $24.50 KIT REQ6132 $49.95 Kits cannot be returned or exchanged once they have been soldered Diamond Tipped Scriber/ RE93KIT2421 /A -- Assembled - -- $39.50 Engraver Pen POWER REQUIRED: 12 VDC regulated. Total 8.6 Watts. STEPPER MOTORS Use a power supply or rechargeable battery. 1.8 DEG, 4 PHASE X PICKUP TUBES: 3 Electrodes Vidicon HS -251 or equal RE93TOL2490 $2.95 1/4 Dia 3/4 Long Shaft SCAN LINES: 525 Lines, 2:1 Interlace 6V, 1.2A/ phase, 80 Oz -In hold torque, 2 -1/4 Sq x 2 -3/16" SYNCH SYSTEM: Internal or External WRITE, CALL or FAX RE93MTR2500 USED ------$12.95 75 VIDEO OUTPUT: 1 V P -P into Ohms, BNC Connector for our FREE 'This Month' Catalog 12V, 0.6A/ phase, 83 Oz -In hold torque, 2 -1/4 Dia x 2 -1/8" RESOLUTION: More than 250 Lines at Center Over 100 pages - hundreds of products RE93MTR2336 - - -- NEW - - - -- $19.50 MIN SCENE ILLUM: 75 to 100 Lux with F1.4 to F2 lens Something for everyone - 'priced right' 12V, 0.68A/ phase, 125 Oz -In hold torque, 2 -1/4 Dia x 3" SIZE: 13.3" longx 5.6 wide x 5.75" high NEW ------$24.50 RE92CTV2208 --- $99.50 Electro- Mechanical Electronics Optics RE93MTR2337 ---- -. Yllla WOiYYa u.i;Ñ-,,,, 24V,0.2A/ phase, 50 Oz -In hold torque, 2 -1/4 Dia o 1 -5/8" CAMERA POWER SUPPLY - Hitachi Model Batteries Power Supplies RE92MTR1992 - - - -- NEW ------$24.50 Adapter, 115 VAC, 60 AP6OU (CEK) AC Power CCTV Hz input; 12 VDC, 2 A output. _s°- Pumps STEPPING MOTOR DRIVER CHIP - $29.50 Complete control and drive for a 4 phase unipolar stepping RE93CTV2209 Lasers Relays motor (6 or 8 lead motors). Can drive up to 35 V and 1.25 R"M _ _ 1" LENS - 25 mm f1.4 adjustable iris. Magnets Robotics Amps per phase, continuous. Provides 3 different step REG4 -024 ------$99.50 _ir sequences - wave drive, full step and half step. Built -in ------Motors di: Switches ñe=-°-___°_ =-- _- clamp diodes and thermal protection. Requires +5V Reg EXT POWER CONNECTOR - required when using Kits Tools for chip. 16 -pin in line DIP. New, supplied with data. your own power supply or battery R EQ5029 ------$12.95 RE93CTV2511 $11.95 many educational kits NOTE: Chips cannot be returned once used.

MOTORIZED WHEEL ASSEMBLY OWL II (T3C2)...This light weight economically Ideal for Carts, Wagons, and powered scope will work with moonlight or an ROBOTS. Will carry up to 100 lbs Night Vision IR light source operating in the 780 to 850 nm depending upon usage. A high applications involving quality reversible motor, driving a Scope range. Unit is ideal for heavy duty gearbox with low speed Lightweight IR lasers. Equipped with removable neutral den- and high torque. Wheel is 7" Diawith sity filter. Viewable distance depends on avail- wide grooved rubber tire on high Handheld able light- -this unit was tested at 200 yards on a impact plasticframe. Top steerable, Focal Range cloudy night with no moonlight or starlight. Will ball bearing mounting plate is 4" operate with 2 AA cells. Size: 10 long x 2.36 square with 4 mounting holes. 1.5 Meters to infinity diameter x 7.1" high. Actual Weight, 1.9 lbs Excel- Speed of unit, from 3VDC thru 12VDC, will run from 40 lent condition. Complete with storage /carrying thru 160 RPM. 5 to 7 Amps full load down to 1 Amp no bag and operating instructions. Shpg, 5 lbs. Made in Russia load. O/A size 9H x 7W x 6 -3/4" Dp. R E92O PT2261 - $395.00 RE92ROB2188 $34.50 SPECIAL PURCHASE! Miniature Folding Binoculars VHS FORMAT VIDEO TAPES 2.5 x 17.5 Power - Actual Weight 2.5 Ounces Russian Mfd....Precision ground and coated optics for excel- Brand New - Not Erased - Individually boxed lent low light clarity, adjustable eyepieces, folds to 1 -1/2" for and wrapped. storage in black plastic case with zipper and belt loop. New. T -90 $1.20 Ea. 5 For $5.00 Shpg. Wt. 8 oz. T -120 $1.75 Ea. 5 For $8.00 RE94OPT2613 $27.95

Serving Science and Industry for Over Fifty Years VISA MasterCard Discover Minimum Order $20.00 in Merchandise WE ACCEPT Add $5.00 for Shipping and Handling BUSINESS HOURS PA Residents Add 6% Sales Tax Sorry! - No COD's MONDAY to FRIDAY 8 AM to 5 PM EST CIRCLE 174 ON FREE INFORMATION CARD 135

www.americanradiohistory.com r GATEWAY PRODUCTS CORP. P. 0. Box: 63 -6397 Tel: (305) 974 -6864 Honey, j shrunk the Prices... Margate, FL 33063 Fax: (305) 974 -6818

TRANSISTORS VOLTAGE REGULATOR r 1 WATT ZENER DIODE 400V BRIDGES RADIAL 'LYTIC CAPS PN2222A 5¢ 7805 47¢ ill1N4728A 3.3V .... 6.5¢ DFO4M 35¢ 1uF /50V 5¢ PN2907A 5¢ 7812 47¢ 1N4733A 5.1V .... 6.5¢ 2.2uF /50V (1 Amp - DIP) 2N3904 5¢ 7815 47¢ 1N4739A 9.1V....6.5* 3.3uF /50V 2N3906 5¢ 7824 47¢ 1N4742A 12V 6.5¢ WO4M 34¢ 4.7uF /50V 5¢ 2N4401 5¢ 10uF/25V Deal 'M4': 12pcs (3 ea) $5 1N4744A 15V 6.5¢ (1 5 Amp - round) 5¢ 2N4403 5¢ 22uF/25V 5¢ 78L05 33¢ 1N4746A 18V 6.5¢ Deal 'N8': 60pcs (10 ea) ....$3 KBLO4 85¢ 33uF/25V 6¢ 78L12 33¢ (4 Amp - TL404) 47uF/25V 6¢ MORE TRANSISTORS Deal 'J1': 10pcs (5 ea) $3 100uF/25V 8¢ 1 /4W 5% RESISTORS 220uF/25V 8¢ 2N2222A 21¢ Deal 'X8': 6.cs 2 ea $3 DIODES 1K, 4.7K, 10K, 47K, 100K, 470K 330uF/25V 9¢ SOLDER ROLL 470uF/25V 9¢ 111 2N3055 62¢ 1N914A 2¢ Deal 'A9':60.cs 5ea 1N4148 2¢ 50 pcs of one value 75¢ SN63/37 - Multicore $4 TIP31C 40¢ 1N4001 .... (1A/50V) 2¢ 21 Gage (.032" dia) Deal 'W6':120.cs 20ea ..$2 TANTALUM CAPS 1N4004 ... 3¢ 1 Lb roll - Great buy 12¢ (1A/400V) MPSA13 A1uF /35V 16¢ 1N4007 (1A/1 kV) 4¢ T1 314 (5mm) $6.25 each 0 2.2uF/35V 19¢ POPULAR I.C.'s Diffused LEDs 10uF/35V 32¢ r MONO CAPACITORS LM324 45¢ MORE DIODES Red 6¢ Deal 76': 15.cs 5 ea $3 Green 7¢ 1N5401 ... (3Á/100V) ... 6¢ fi ' M358 45¢ Yellow 8¢ CERAMIC DISC CAPS 1 N5404 ... (3Á/400V) ... 7¢ .01uF/50VID 5¢ NE555 40¢ Deal 'LT: 30pcs (10 ea) $2 5 t each 1N5408 .... (3A/1 kV) .... 8¢ .1uF /50V 5¢ NE556 45¢ (Caps rated 50V) 6A10 (6A/100V).180 M741 35¢ I.C. SOCKETS TOGGLE 10pF 220pF 6A100 (6A/1kV)..210 SWITCHES Deal 'U3': 12pcs (2 ea) $5, 22pF 330pF Solder Wire Miniature size POPULAR CMOS nL rrrf Tail Wrap 1/4" Panel hole 27pF 470pF 33pF 1000pF GERMANIUM DIODES 8 pin 4¢ 30¢ on-on SPDT 60¢ CD4001B 25¢ 47pF .01uF ,1N34A 10¢ 14 pin 7¢ 54¢ on-on DPDT 68¢ CD4011B 25¢ on-off -on DPDT 86¢ 100pF .1uF 1 CD4013B 30¢ 1N270 16¢ 16 pin 9¢ 62¢ Deal 'ST: (2 Deal 'R2':60.cs 5ea $3 CD4017B 35¢ Deal 'G3':10.cs 5ea $1 20 pin 11¢ 78¢ 6pcs ea) $4 , CD4028B 35¢ 24 pin 14¢ 94¢ 306 Push -Button NOW AVAILABLE !!! CD4066B 30¢ r SCHOTTKY DIODE 28 pin 16¢ 1.10 Mini size Our 1994 catalog Is hot CD40698 30¢ 32 pin 19¢ 1.24 N.O. Momentary ....27¢ off the press. Mail your 1 N5821 .... (3A/30V) .. 42¢ 40 pin 23¢ 1.54, request today.

$10.00 minimum order. We accept VISA, MC, MO, Check, C.O.D. Cash. Please add $4.00 for shipping & handling. C.O.D. charge is $5. L Foreign orders: $9.00 freight charges. Florida addresses add 6% sales tax. Hours: 9AM to 6PM - Mon -Sat. All premium, high -quality parts.

CIRCLE 298 ON FREE INFORMATION CARD

7a r:l:r:f:: f f r r:r:r:r:l:r:r:l . Professional Electronic :f. Press 1 for Engineering Software ; rj1 'r: sales, 2 for :1Z; "Best bargain in the country" Mail service, 3 for :f Linear AC DC Circuit Anal sis Control S stems anal sis =f =. live iff. operator Adive & Passive ckts. 50 nodes, 225 Cale and Plot Root Locus, Nyquist, elements max. Models for acalvo devices. Bode of any H(s). Determine gain t r -rtr: rtr: r: r: r: r: rtrtr. Cale, Plot & Print AC vohages & currents. and Phase Margins /stabllty. More +thr:r: Cato DC current, voltage & power. More Cash 'i!i!~ltilir Linear Transient Circuit Anal sis Calc, plot mag/ phase of H(s). more 10 Input Transients. Active, passive ckts. 50 nodes, 225 elements max. Models for active Function Gra hies Mac ine devices. Cale, plot and print output Transient Calc, plot, edit any of 87 common voltages. Cale dc current, voltage, pwr. more. math functions as desired. More. Active Filters Desk n & Anal sis Data Graphics Make thousands of dollars effortlessly by installing a BigmOuth voice Design & Analyze active LPF, BPF, HPF & Plot up to 400 data points In 9 package in your 286/386. Use it to answer your home -office phone, rent All ass fibers. Calo, lot Ma / Phase. More. formats. Linear, log, semi, eto.more pocket- pagers, advertise products or operate a pay -per -call service using Pol nomial Ocrations major credit cards, passwords or a nationwide 900 #. Cato, plot transient response of system H(s). Calo Roots, Product & Coefficients. 14 Input Transients. Inverse La. lace. Mom To get started, order our $25 PC Opportunity Toolkit. It contains all New ! Circuit Schematic Draw: Both Stand -alone & Inte rated the information you need & its cost is applied to all future purchases. Cut,Copy,Move, Merge,Chock.Grld,Label,Llst,128 symbols,300 elements,more ... :-'ß1-flt_rh`Mtw.pt I rtll-m A Few Home -Based Ventures Featured In Our 525 Toolkit! i- i, .1r ,k-J,E,.,71i- l i I 1 I I ltI ï i 1 BigmOuth Quickline ClientCaller II 1h l; . / 'I t voice mailbox/ write programs outbound !ái'"1s" li pager rentals in QBasic prospector : I{' I II -iT: , - . x295. (Demo '1745. ;i.l., _r .14'=41-, '25) (Demo '1450. I I i i '25) (Demo '25) ilü u ini ; I , KinderChek Rise'n'Shine TollBridge Easy to T, Dos, EG,t/VGA; / Extremely use latchkey child wake -up & sell long 100% monitor reminder service distance Irme Dot Matrix/Laser/Mouse Support Satisfaction '2000. (Demo '25) '1995. (Demo '25) '1995. (Demo '25) Outstanding Graphics & Menus Guaranteed 200 page User's Manual Included Introductory Offer: 9-program package (without Schematic Draw) leDemoSourceam TRY our demolinel 818 718 -9560 $79.99 The Voice Application Superstore Complete 10- program package (with Schematic Draw) $129.99 Visa/MC accepted. Add $5.95 for shipping. CA add 7.25% Tax 6345 Reseda 91, Ste 202 136 Northndge, CA 91324 USA To order or info call 1(800)645 -6806 or send check or money order to: n.ee.s.rks belang to their peam,e.. To order, call 24 hours: Prices do not Include ehl in A lax 800.283.4759 ® Geoban Engineering,PO Box 658,Ridgecrest,CA 93556 www.americanradiohistory.com BBS On -Line Store Inventory (310) 217 -1922 computer and What is a BBS On-Line Store? On a daily basis we add inventroy to our computer system which is hooked up to a telephone line. Using your 1 There modem, you can access our computer by calling (310) 217 -1922. Your communication software should be set to 8 data bits, no parity, and stop bit. are 2 files: INVENTORY which is components such as connectors, capacitors, switches, IC's, etc.; and SPECIALS which include motherboards, controllers, line. All items in drives, etc. By the time you read this, our automated ordering system should be in place. You will be able to upload your order via an 800 this ad will be listed on the BBS at a discount (cheaper than advertised here) when you order directly through the BBS. Call for additional bargains. 125 MB HARD DRIVE ESDI AST FOUR- PORT /XN 16 mil sec acc, w/Everex ESDI controller EV -358 HD/FD $135.00 UARTS socketed (16450's) DOS & Xenix drivers $29.95 3-MEG AT Class/386/16-Bit Memory Board New Everex Model EV159, supports extended & expanded memory LIM 4.0 with documentation & software, Uses 256K RAM. Will populate for $23.40 per meg. 511.95

FLOPPY DRIVE New, 360K DSDD $9.95 IC MEMORY CARD $99.00 PC 2.0 JEIDA SCRAM Memory Specify black or beige bezel Buffalo RJB -1000, SCRAM card -1 Meg -MCIA Card by Melco Inc. Type 1 card, thinnest to fit type 2 or 3 slots. Will fit device 8 Blots, 8 MHz, $16.95 XT Motherboard meeting standard: HP95LX, Sharp, NCR, etc. Elsewhere for $150. XT MOTHERBOARD $26.95 Our price is BELOW WHOLESALE! 10 Mz, includes CPU, BIOS, serial, parallel, game, clock, light pen interface, CGA, ARCNET CARD By PB -LINK $25.00 Mono, NTS, & floppy controller, 360, 720, 1.2, & 1.44, fits low- profile desktop w/ 8 -bit. supports 50, 75, & 93 type cable, Packard Bell horizontal slots. FANTASTIC BOARD! Quantity limited ELECTRONIC THERMOMETER $29.00 PC MOTHER BOARD BY HYUNDAI $13.95 Model 1003, Range -75 to +1999° F, also measures Centigrade, uses NiCr/NiAL (not incl.) by Ricoh With serial, parallel, floppy controller. Space for 512K memory on board. sensor Paradise $19.95 MICROCONTROLLERS EPROMS CGA VIDEO CARD By 8741H $5.00 2764 .99 ADAPTOR KIT For Hard or Floppy Drive $3.00 8751H $8.00 27C128 $2.50 (3.1/2' drive in 5 -1/4' slot) with hardware & cable $3.00 8749 $4.00 27256 RLL Controller Data Tech. $35.00 8031 $2.00 27C100 $4.00 Floppy Disk Controller Board $9.95 Dual, 360K or 720K switch selectable LASERS SCSI kit CONTROLLER by FUTURE DOMAIN TMC 830 .... $35.00 Lasers 3-4 Mw HeNe $24.95 SCSI Cable (male DB25 to male Centronics 37) $7.00 Lasers 4 -5 Mw HeNe $35.95 CCD SCANNER BOARD $24.95 Laser Assemly $59.00 Uses a 4096 -element line imaging chip. Can use for robotics, astronomy, machine Model 750F, includes laser, power supply, polygon scanner, mirrors, vision, high resolution slow scan TV, etc. Supplied with documentation. detectors, & optics, runs on 115 VAC 50 -Watt Switching Power Supply $14.95 Visible Laser Diodes (visible red light) Astec Model #AC9232 -01 for microprocessor-based systems, disk drive systems, 1Mw $15.00 2Mw $23.95 terminals & mixed logic. 5 VDC /6A, +12 VDC/2.5A, -12 VDC /0.5A, -5VDC /05A Laser Diode $15.00 STEPPER MOTOR $19.95 lense 5mW, by Toshiba, brand new, TOLD9200, without focusing by Oriental Motor, Model #PH566-A-Q5, high precision, 500 steps per rev., Laser Diode Kit $49.00 0.72° per step To power TOLD9200, includes laser diode, board, parts, instructions Monitor Board with Power Supply $7.95 Laser Tubes $39.95 High voltage, video, brightness, focus, vertical and horizontal From SIEMENS, brand new, 5mW HeNe with flyback transformer. Model 99- 0493 -001 rev D. SOLID STATE RELAY $8.95 Cryon D1240, input 3 -32 VDC, output 120 VAC 40A CICOD or send Cashier's Check or Money Order to ECSC MOS Fet N-Channel Part #SGSP222 50V 10A ... 4/$1.00 1490 W. Artesia Blvd. Gardena, CA 90248 Controllers Orders only (800) 543-0540 FAX (310) 217-0950 Token Ring Board $99.00 Tech Support & Info (310) 217 -8021 Proteon Pro-NET -4 Model OP1347, 4 M/bits $20 minimum order, CA residents add 8.25% sales tax. $19.95 Prepaid: We pay shipping M Continental US. on orders up to S100. MFM, WD1002 -WA2 Over $100 add 810 shipping and handling. Laser deck. MFM for XT WDXT -GEN $35.00 ...... , $20 shipping and handling. COO: You pay shipping $4.50 UPS COD charge. Come into Our Hu e L.A. Store 137 CIRCLE 297 ON FREE INFORMATION CARD www.americanradiohistory.com QUALITY PARTS DISCOUNT PRICES FAST SHIPPING

Futaba M M202SDO8GL Prototypers, Make PC Boards Two rows of 20 characters displayed in a 5 X 7 developers VACUUM FLUORESCENT DISPLAY dot matrix. Bright green 5 mm X 3.5mm charac- in Minutes... and hobbyists ters. On board CPU, driver and DC -DC convert- can now make er simplifies hook-up and interfacing. Operates PC boards direct on 5 Vdc. Displays 215 different characters in- from CAD, PCB layout cluding alphanumeric and other symbols. ASCII systems or magazines configuration. Module overall dimensions: 6.1' X using a photocopier, or 1.7' X 0.7" thick. laser printer. Techniks Inc's new "Press -n- These displays were modified somewhat from Peer copy paper al- original specifications and we do not know the lows you to photocopy exact nature of the modifications. They work fine PC artwork and iron it in the test mode, but we don't know if the original on to copper -clad interface is the same. We supply a data/ hook- Five board. It then can be up sheet for the pre -modified device which, 8 1 /2" X 1 1 "sheets chemically etched in hopefully, provides most of the information and instructions. the usual fashion. The necessary to use the display. process is so easy and fast you won't believe it. per pack CATS* TEK -5 3 1/2 DIGIT LCD 5 Volts, 20 Amps DIGITAL PANEL METER POWER SUPPLY ELECTRET MIKE WITH VISOR CLIP FEATURES: RTE Power /Mate# EVS -5F 200 MV full scale Input: 115 /230 Vac. sensitivity Output: 5 Vdc, 20 amps. Miniature electret condenser Single 9 -12 Vdc microphone designed tor use operation with cellular phones but could Decimal point be used in other audio appli- selectable cations. Black 0.3' diameter f J 13 mm figure ht. X 0.43' mike and 12 foot flex- Automatic ible cord with 3.5 mm mini - polarity indication plug. Includes chrome -plated alligator clip which can be Guaranteed zero reading for 0 volt input high input impedance (>100 M used for attachment ohm) 1 mA DC to auto visor power dissipation. LCD size: 1.83' X 0.8'. Overall size: X - or clothing. 2.67' 1.73' 0.28' above panel thick ness.0.57' overall thickness. Add resistors and Brand new switching power supply enclosed in disconnect jumpers for voltage ranges to 500 Vdc. vented aluminum cabinet. Over -voltage, over -load. Instructions included. short-circuit protection. Fuse protected. Adjustable $4eß output voltage and CATS MIKE -14 current limiting. Inrush current CATS PM -128 limiting. Screw terminals for input and output. UL and CSA listed. 8.5' X 4.9' X 2.45.' 36 PIN SNAPPABLE HEADER $15P CATS PS -520 SPECIAL! SPECIAL! AA NICKEL CADMIUM BATTERY CHARGER 1 3/4" SANYO# NC-452 SPEAKER Arkles Corp. # 25MSS2A36GG030 Battery charger for 2 or 4 AA nickel Special purchase of 36 pin, single row 0.1' spacing cadmium rechargeable batteries. 8 ohm, 1 watt speaker. Plugs headers. Snappable to smaller lengths. Sold only in into wall outlet and charges Very heavy magnet in bags of 100 pieces. Our regular price on a 40 pin batteries 8 to 10 hours. Can be for its size. is folded for easy header $120.00 per 100 pieces. carrying and stor- Speaker o.d. 1.8' CAT# SHS -36 age. 3.25' X 1.6' X 1.81' when Magnet o.d. 1.35' folded. UL listed. $350.00 $4000 for CATS SK -175 CAT# AAC -1 for 100 piece bag 1000 pieces $125 100 for $100.00

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ORDER TOLL FREE 1 -800 -826 -5432

Minimum Order $10.00 All Orders Can Be Charged To Visa, Mastercard Or Discovercard Quantities Limited California, Add Sales Tax Shipping.And Handling $4.00 For the 48 Continental United States - All Others Including Alaska, Hawaii, P.R. And Canada Must Pay Full Shipping No C.O.D. Prices Subject to change without notice.

CIRCLE 214 ON FREE INFORMATION CARD

www.americanradiohistory.com SELLING ELECTRONIC PARTS AND SUPPLIES SINCE 1967

12 Vdc MOTOR VIDEO /RF MODULATOR ULTRASONIC PROXIMITY DETECTOR Mabuchi # RS- 380P11 Originally Operates smoothly on 6 to 20 Vdc. made for 3,200 RPM ® 12 Vdc (no load). use with the 1.15' diameter X 1.7' long. Commodore 0.1' diameter shaft. computer, these good $ quality video 2 were each modulators CAT I DCM-47 probably originally designed for 9 Vdc use, but they operate well on 6 -12 Vdc. They accept color video and audio, and a selector switch is provided for out- The ED -100 was designed for use as an auto/RV/ put to channel 3 or 4. Easy to hook -up. Requires truck back-up alarm. Two 40 khz ultrasonic emitter/ a 6-12 Vdc power supply or wall transformer and a GELL CELL BATTERY detector modules attach to the back of the vehicle connector to interface with your audio/video and warn the driver when the rear of the vehicle is CHARGER Output is an RCA jack. Hook -up instruc- source. within 24 feet of another object. A digital display and tions included. 3' X 1.47' X 0.75 ". audible beeper inside the car continually monitor the CATI AVMOD-3 $5 distance to impact. The ultrasonic modules measure 5.81' long X 1.9' wide X 2.05'. Operates on 12 or 24 Vdc Includes instructions for installation. The units are new, in original cartons and, as far as we know, in working condition. The company that 10 AMP SOLID STATE RELAY marketed this device is no longer in business, and no manufacturer's guarantee is in effect. We offer Teledyne Relays # 6t5 -8500 these ultrasonic detectors for experimentation Kintek "IntellichargerT"'" Control Voltage: 3 -32 Vdc only, and In no way wish to promote their useful- 10 ness as a driving aid. Charges 12 volt gel cell Load: amp, Vac 50/60 hz. lead -acid batteries of 1.6 amp/hours or greater. 250 "hockey puck" Original Sold For OVER $100.00. Charger circuit regulates current, providing more cur- Standard 2.27" X 1.72' X (195 ". rent to low cells and gradually ramping down current size: and qc terminals. as battery approaches full capacity. Bi polar LED Screw CAT # ED -100 UL and CSA listed. glows red when battery is taking a fast charge and green when is ready for use. Batteries can be $24n battery CATI SSRLY -14 left on charger indefinitely. Originally designed to charge a particular phone battery, the output cord on this devices terminates with a 5 pin DIN plug which $' 10 for $95.00 EXPERIMENTER'S DELIGHT can easily be replaced with connectors more suitable 050each VHF TO UHF to your particular application. You will need to open the case, clip -off the DIN cord and reconnect desired BLOCK CONVERTER output cord. 240 X 128 DOT LCD CAT# CK -128 $ls I

8 mm Video Camcorder (USED) "HI -8" Users! VIDEO CASSETTE Channel Master# 0746

-S. This is one of those deals that's too good to be true. We have a new supply of eeeeeeeeeeee s Brand new, in the box, Channel Master block converters. these popular T -120 They used to be popular a few years ago before there (120 minute) Hi -8 video Optrex# DMF660N -S 240 X 128 dot LCD module with on- were a lot of cable -ready Ns. Somewhere in the world cassettes. These are board drivers. Will display graphics, figures and characters. we know there is still a demand for them- especially at top quality, metal oxide Module size: 5.68' X 4.1" X 0.5" thick. Viewing area: 4.1' X this price. Designed to convert television VHF channels (particle) cassettes that 2.52'. Dot size: 0.4mm X 0.4mm. High contrast, wide view- 2 through 13 and A through W to UHF channels 36 were used for a short time, ing angle. Low voltage drive and low power consumption. through 76. The box alone, is a great project box. The then bulk -erased. Each cassette has its own plastic Uses fitting controllers LSIMSM6255, HD64646, SED1330, 10 ft. AC power cord, the interior components, F connec- storage box. New, they would sell for considerably SED1351. Includes hook -up instructions and specs. tors and AC receptacles are well worth the price. more than we're asking. We've sold thousands. CAT# VCU-8 CATI LCD -15 CATI CM -0748 $244 $3 each 10 for $28.00 $2994,

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FAX (818) 781 -2653 INFORMATION (818) 904 -0524

Mall Orders To: =NM RETAIL STORES VISA IN CORP. LOCATED ALL ELECTRONICS Los Angeles P.O. Box 567 Visa, Mastercard, Discover, and Van Nuys Van Nuys, CA 91408 Checks, Money Orders CALIFORNIA Accepted On All Orders 139 CIRCLE 214 ON FREE INFORMATION CARD

www.americanradiohistory.com $44995 Device Programmers '139" Connects to standard PB -10 Internal Card for PC 48 PIN Easy to use software, ; parallel printer port L ZIF PC on -line help, full sceen editor Fast Programming (EMP -20) 27C010A, 23 seconds 28CO20, 34 seconds 27C040, 95 seconds Made in USA 40 PIN 1 Year Warranty 2 ft. Cable ZIF Technical Support by phone \ 30 day Money Back Guarantee FREE software upgrades available via BBS Demo SW via BBS (EM20DEMO.EXE) (PB1ODEMO.EXE) E(e)proms 2716 - 8 megabit, 16 bit 27210 -27240, 27C400 & 27C800, Flash 28F256- 28F020, (29C256- 29C010 (EMP -20 only)) Micros 8741A, 42A, 42AH, 48, 49, 48H, 49H, 55, 87C51, 87C51FX, 87C751,752 GAL, PLD from NS, Lattice, AMD -16V8, 20V8, 22V10 (EMP -20 only) FOR MORE INFORMATION CALL 4630 Beloit Drive, Suite 20 NEEDHAM'S ELECTRONICS, INC. (916) 924 -8037 Sacramento, CA 95838 BBS (916) 972 -8042 (Monday- Friday, 8 am -5 pm PST) C O.D. FAX (916) 972 -9960

CIRCLE 257 ON FREE INFORMATION CARD DC/CAD introducing... THE TERMINATOR Super High Density Router /4'OTRONIC (Complete with Schematic & PCB EDITOR) QUALITY ELECTRONIC Features the following powerful algorithm & capability: TEST EQUIPMENT Rip - up and Retry foi Pre- routing of SMT components Call $95 Sales Service Real-Time via minimisation only) EleoñV DC!CADtudents Specialists in - Fluke, ¡TWOS Real-Time clean up passes (avatlnorma\ FAxYouEsuoisfill7en/ pt;$25oo Hewlett Packard, Tektronix User defined strategies $295 Window 3.0 capability as DOS Task NIST Traceable /Mil Spec 45662A

1 -mil Autoplacer and Autopanning Calibration Available Two-way Gerber and DXF Automatic Ground Plane w/ Cross -Hatching TECHNICAL SUPPORT Complete w/ Schematic & Dolly Libraries Oscilloscope Specials Optional simulation capability & protected mode for 386 users Tek 465 100 MHZ $489,00 * PCB LAYOUT SERVICE AT LOW COST * Tek 465B 100 MHZ $589.00 Tek 475 200 MHZ $649.00 LEASE PROGRAM & SITE LICENSE AVAILABLE Tek 475A 250 MHZ $749.00

. ALL EQUIPMENT SOLD WITH WARRANTY

r áIM7 For more GREAT VALUES Call, Write, or FAX Design Computation P.O. Box 708, Medford, MA 02155 F71 State High 34 (617) 391 -6858 FAX (617) 391 -6903 rmin e N J 0way7727 (9081 681 - 77J (9Ò81 681 - 8733 (FAXI 140 " DC/CAD ... The focal Point offuture CAD =ricer "

www.americanradiohistory.com OCEAN STATE ELECTRONICS HOBBYIST, AMATEUR, OR COMMERCIAL -WERE YOUR ONE STOP ELECTRONIC SOURCE CALL OR WRITE FOR OUR FREE 112 PAGE CATALOG 1- 401 -596 -3080

DELUX CODE KEY MAKE CIRCUIT BOARDS -a .a- AIRCRAFT RECEIVER KIT Adjustable, heavy duty brass base THE NEW, EASY WAY WITH ...puts you in the pilots seat!! ball bearing oriels *It TEC -200 FILM Tune into the exciting world of airaron. Listen to airlines, big Designed for hard usage local private JUST 3 EASY STEPS. business corporate jets, hot -shot military pilas, 3116 plated contacts. and departure radar control and Copy circuit pattern pilots, control towers, approach air -band communications. You'll $11.75 on TEC200 him 081a/interesting and fascinating miles away as well as all local traffic using arty plain hew planes up to a hundred from 118 to 136 MHz, effective paper copier The AR -1 features smooth varactor tuning of the entire air band speaker Iron film on to AGC, slpertatrodyne circuitry, squelch, convenient 9 vos operation and plenty of for project you'll love CODE PRACTICE copper clad board volume. Dont forget to add our matching case and knob set a fine bokng instruction manual makes the AR-1 an deal introduction to two fie -long OSCILLATOR & MONITOR IN KIT Peel off film and etch - - to show. Our detailed Convenient it 1/2 x 11 sae fascinating hobbies at once - electronics and awatonl FORM OR WIRED With Complete Instructions KIT $29.95 A sold-state code practice oscillator and monitor that AR -1 AIRCRAFT RADIO 5 SHEETS $8.25 uses the latest IC circuitry h conta re a 3 built-in C-AR CASE SET FOR AR -1 $14.95 speaker, headphone terminals, a volume control and a 10 SHEETS $10.75 tone control h is a attractively 20 SHEETS $18.25 with color panel With 50 SHEETS $33.50 packaged a two BY BUILDING THIS KIT the adddon of a few pans, the ont can LEARN COMPUTER THEORY easily be converted into CW mentor h DIGITAL TRAINER MODEL MM -8000 can there lore be used as an operating DIGITAL CAPACITANCE/ Staring from scratch you build a compete computer system. Our Muro-Master trainer teaches aid after the code has been learned vital INDUCTANCE METER you to write into RAMS, ROMs and run a 8085 rrticroprooessor. You will write the instructions to tel the 8085 processor to get staled and store these instruction in permanent Kit $19.95 METER measures DIGITAL LCR memory ina 2816E'PROM Teaches you all about input and output pons. corrpuler timers Build inductance, capactance and resistance Wired $24.95 your own keyboard and learn how to scan keyboard and display No previous computer meter that everyone can At Last! M LCR knowledge required. Simple easy to understand instruction teaches you to write or machine measure coils, afford. Now you can language Upon completion of the course you wntl be protean! in computer technology. transformers, chokes front 1yH to 200H the 8085 Microprocessor TOROIDS Capacitors from.1 pfd to 200 coed and Uses resistors from 1 ohms to 20 meg ohms Uses the 2816 Et PROM, electrically eras- IRON FERRITE Al in one handheld instrument. able programmable ROM T -25 -2 40 FT37.43 ...... 60 MODEL LCR -1801 $119.95 Uses the 81560, 2018 Bit static MOS RAM T -254 40 FT37.61 60 with VO pons and timer Memory expandable option T-37-8 45 FT37.77 6o CLAD COPPER Built in 5v power supply T -37 -12 ...... FT50-43 ...... _.- 75 PC BOARDS keyboard T-50-2 55 FT50- 61 ...... _.-.76 28 key One oz. copper, phenolic base instructions T-50 -3 55 F750 -77 ...... 75 Complete with lesson manual, and apartments T504 fió F762.43 1.00 7' x 5' SINGLE SIDED $1.50 T68-0 715 F782-67 1.00 31/4* x 6112* DOUBLE SIDED $1.25 $119.95 T68 -2 75 FT8246 1.00 T68-6 76 FT11441 2.15 200 WATT INVERTER LEARN RADIO THEORY BY BUILDING T80 -2 U F714043 4.10 Plugs into your lighter and runs. THESE UNIQUE KITS! T200-2 4.00 F124041 5.00 Ham Equipment Both kits include an assembly, lesson and theory of Lights operation manual The actual assembly is broken WE STOCK A COMPLETE UNE OF Soldering Iron into simple sections Each sedan should be com- Computer TOROIDS AND BEADS. pletely tested before moving on The reduces diffi- Power Took cult troubleshooting associated with many similar Shaver kits Both include practical hi-tech PC board, with 13' TV with VCR Q-DOPE schematic on the salaam, banary, all com- Pp 200'x 579.95 MUCH MORE printed Solution of purs polystyrene in solvents. Dnes ponents and solder. The 10 to 15 volts DC last and leaves a dear, protective coating on manual is easy to under- 115 vole AC atue RMS Weight: 15 ounces AM/FIA-108 $29.95 10 toriods, coils and transformers, with no or stand, no previous 400 Watts peak Warranty: 3 year LIminimal effect on inductive values May also be AM/FM Superhet RADIO KITAND TRAINING knowledge of electron- 200 Watts for 2 minutes 5 x 2.6- x 1.T used as a cement for molded or fabricated ics necessary Each ra- 140 Watts continously COURSE 14 Transistors and 5 Diodes items made of polystyrene de luo PC board has been sodesgned that no cabi- s 150W. with Brush 2 fl oz. 59 rr4 $3.75 net is nsoassary A spe- TO ORDER cal bracket provxles the necessary suppon to use VERNIER DIALS the rade in any location, Call 1- 800 -866 -6626 ORDERS ONLY the work 1 -1/7 Damner 0.10 Marking $8.25 displaying achievement 1- 1/7 Dameter0- 100Markng $9.25 (Catalog requests can not be taken on toll 2 Diameter 0-100 Marking $10.25 free number.) AM -550 Transistor Superhet AM Radio Kit .$19.95 8:30 a.m. - 5 p.m. EST MERE Monday through Friday 1"--1MasterCad FIBER OPTICS KIT WITH TRAINING COURSE SIGNETICS NE602AN Balanced Mixer/OSC. Popular IC among OR WRITE TO: experimenters for building DC and super -het 1 receivers Ocean State Electronics, $2.49 P.O. Box 1458, Westerly, R.I. 02891 FO-30 OR FAX TO: CATALOG /ORDERS Loam thebasia of fiber optics data communications while you build the exciting kit. Comes correlate with all the necessary conponente. MINI- CIRCUITS SBL -1 (401) 596 -3590 (401) 596 -3080 including PC board and fiber opts cable, also separate transmitter and DIODE RING MIXER receNef. Double balance Muter If paying by CREDIT CARD include Card No. LO/RF t -SWMHz and Expiration Date RF DC - 500 MHz SIGNAL INJECTOR/TRACER KIT in include $4.50 shipping $6.75 Mail orders This handy tester s both a signal generator and re- ALASKA & HAWAII $11.00 ceiver As a generator use it to check out an amplifier, CANADA $8.50 OVERSEAS $14.00 stage by stage Also tests AM radio IF and RF stages - As a receiver you can pin point where a detective pan LINEAR IC'S TRANSISTORS Minimum order $10.00 (before shipping) exists Will transmit and receive simultaneously NE555 .45 PN2222A .10 R. I. Residents add 7% Sales Tax $18.95' -_- 2N2222A .32 NE564 1.75 ORDERS RECEIVED BY 1:00 PM EST- SHIP LM733N .65 2N3055 .69 SAME DAY! FREE SHIPPING ON ALL MAIL IN 'Sa MAGNET WIRE LM741 .40 2N3553 2.75 ORDERS OVER $50.00. Enamel coated solid capper. For tending UA7805 .49 2N3563 .40 coils, transformers and tomes. Prices for UA7812 .49 2N3866 1.05 NOT VAUD WHEN COMBINED W/CAT. ORDERS. 1/4 b. spools U.S. UA7912 .75 2N3904 .10 Applies to UPS Ground in Continental Only. s14....4.00 #20 ....4.00 #28 .... 4.85 #36 .... 6.85 Catalog FREE to US Customers. LM317T .79 2N3906 .10 616 ....4.00 #22 ....4.25 #30 .... 4.85 638 .... 6.95 Canada, Please send $2.00 (American funds or US stamps). 618 ....4.00 #24 ....4.25 632 .... 4.85 440 .... 7.85 CA3126E 1.60 2N4401 .15 Overseas, Please send $3.00 (American funds or US stamps). #26 ....4.85 434 .... 8.25 CD22402E 9.95 MPF102 .49 141 CIRCLE 260 ON FREE INFORMATION CARD

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WOMAN Inductance. 0.1 pH -200H Period O 1µs -01s Records Max/Min /Average Capacitance:0. 1 pF- 10,000µF teS Capacitance. 0.1 pF- 20,000pF Data hold, Impedance:1 m0 -10M0 Resistance: 1m0-20M0 relative mode 1% Telescoping antenna $8.00 0.7% basic accuracy basic accuracy Deluxe case $5.00 Dissipation factor 8 0 factor Dissipation factor indicates leakage Also Available: Serial 8 parallel mode in capacitor and 0 factor in inductor AC /DC clamp meter,Light meter, Relative mode for comparison Zero adjustment to reduce parasi- Thermometer, pH meter High and to remove parasitics .. tics from test fixture voltage probe, Digital caliper, Statistics, tolerance, .... 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Linear 10'.1 /Log 10.1 SG -4160B AG -2601A 20ms to 2s AM Modulation Frequency counter 1Hz - 150 MHz Frequency counter 1Hz- 150MHz ri- Gated Burst, Voltage Control Generator ,. for internal and external source for internal and external sources Generator Control Voltage 8 6 digit Sensitivity <50mV Sensitivity <50mV counter 1Hz-10MHz for internal 8 external sources 526 ALFA ELECTRONICS (800) -2532/(609) 520 -2002 15 DAY MONEY BACK GUARANTEE t YEAR WARRANTY FAX:(609) 520 -2007 CALL OR WRITE FOR FREE 741 Alexander Rd., Princeton, NJ 08540 CATALOG AND BEST OFFER Visa, Master Card, American Express, COD, Purchase Order Welcome 148 CIRCLE 213 ON FREE INFORMATION CARD

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CIRCLE 213 ON FREE INFORMATION CARD 149

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CIRCLE 311 ON FREE INFORMATION CARD

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Couper. 940-1900 MHz 51,600.00 TEK DA40134 Distortion Analyzer. 0 0025% TOD HP B082Á 250 MHz Pulse Generator HP 778D-op 011 DWI Do. Cailler. 5400.00 $700.00 HP3400A RIMS Vollmeer. 10 Hz -10 MHz $250.00 TEK PG502 250 MHz Pulse Generator, Trc1nS 20 48.01 -2GH0 02,600.00 HP204D Audio Oscillator w/80 dB alten $200.00 HP 81651 Prop. Signal Source,1 mHz -50 MHz HP 7790 Dr. Couper,20 dB. 1.7.12 4 GHz 5375.00 HP3335A Synth /Level Gen . 200 hz-60 MHz $3,250.00 TEK PFG5505 Pro9. 12 MHz Pulse/Function Gen $1576.00 HP 6084 Coaxal Termination, DC-4 GHz $50.00 HP33368 Synthesizer/Level Gen., 75 ahme $650.00 WAVETEK 178 50 MHz 01,600.00 HP R532Á Frequency Meter. 26 5 -40.0 GHz 5500.00 HP3336C Synth /Level Gal .10 kHz-21 MHz $1,250.00 Programmabe Waveform Gen M /A-COM M677006 -0104 Crystal Detector. 635 00 KROHN -HITE 3202R Dual HP /LP/BP/BR $500.00 9-11 GHz, SMA Fi6er,to 2 MHz VOLTAGE & CURRENT MILITARY AS -13488 Double $75.00 PA R. 189 Fiber /A npfier, 0.1 48-110 kHz 5350.00 $1,100.00 Ridge Horn. 3-8 GHz, N(0 FLUKE 5-10 Voltmeter $400.00 ROCKLAND 752A-opt 02 Dual Low 85036 Digit NARRA 28102 Dr Coupler. 30 dB, 2 -18 GHz 5150 00 Set $5,250.00 Pass Filter, 115 dB/oct HOLT 11 AC Thermal Converter HARDA 3000-SERIES Daecoonal Couplers 5150.00 $360.00 TEK ÁM502 Drfemrbal AmpkAer 5575.00 HP3437A System VWtrneer NARM 3090 -SERIES Precaon Hi $225 00 $396.00 TEK DM511op.02 4 -1/2 d9it Dueutoty Coupler DMM BTemp Robe. NEW RF & MICROWAVE PARDA 372NM Sliding Termination. $90.00 HP6115A Precision DC Supply. to 99.99V $600.00 HP5371A Modulation Domain Analyzer $5,900.00 2 -12 4 GHz KEITHLEY 228 Prog. Voltage/Current Souris $2,260.00 NARRA 4006SERIES 575.00 HP8443A Tracking Generator, 01.110 MHz $700.00 SIM. KEITHLEY 230 Programmable Voltage Source $1575.00 HP8444A- 0pí059 Tracking 51,500.00 Directional Couplers KEITHLEY 414 PKOemmeter. 01 M-10 roil $375.00 Precla,on 5300.00 0.5 -1503 MHz HARDA 5070-SERIES KEITHLEY 614 4-12 digit Electrometer $1,000.00 Generator, 00 Refbclometer Couper Probe..... $1,000.00 HP8562B IF Section $750 TEK MA503/P6302 Current NARRA 78620 20 dB Attenuator. 5250.00 HP85638 RF Section. 1 1440 -110 MHz $500.00 DC -50 MHz.w/TM501 HP8554B RF Section, 0.1.1250 MHz $800.00 150 W OC-8 GHz TEK CT -S H,g0 Curran Transformer $660.00 $950.00 WEINSCHEL 1515 Power Dmder. 512500 to 517i/.500mA $600.00 HP8555A RF Seceon, 001 -18 GHz HP 6177C DC Curren Source. DC -18 GHz. SMA $750.00 TEK TR503 Tracking Generator, 0.1.1800 MHz $1750.00 HP6186C DC Curren Source, to 306/,100eA WEINSCHEL DS109 Double Stub Tuner $100.00 HP8405A Vector Voltmeter, 1 -1000 MHz $70000 KEITHLEY 220 Programmable Current Source $2,000.00 1 0-13 0 GHz HP850204 Directional Bridge, 0 01 -4 3 GHz $750.00 KEITHLEY 225 Curren Source, 1 499 9 ,M $460.00 Double Stub Tuner, $100.00 HP85021A Directional Bridge, 0.01 -18 GHz 51.200.00 WEINSCHEL 0X109 -L 1 W41 A $760.00 KEITHLEY 227 Current Source, o 4 -4 0 GHz $320.00 HARM 70014 Microwave Mu6mieter. 51.950.00 KEITHLEY 261 Pcoempere Source 05109-LL Double Stub Tuner, $150 00 01 -18 GHz WEINSCHEL 1038810/D14A Scalar Network M. $1,250.00 0 2 -2 0 GH_ I IMPEDANCE & COMPONENT TEST 1/114VETEK 1 MHz- 2650Hz 1020 51.850 00 HP 4800A Vector Impedance Meter 5550 00 BOONTON Synth Sig Gen.. MHz 1 -3000 $500.00 O.15á40 BOONTON 72B t MHz Cap Meter. pF HP 28687A LAN Wre Test Instrument $750.00 MHz. 52.250 00 BOONTON 102C Signal Generator. $860.00 HP 4342A 0-Mater, 70 kHz -22 Q=5.1000 HP 59401A HRB Bus Analyzer $700.00 Meter, 20 -230 MHz $1,100.00 0.45 -520 MHz MEGURO MO-171 VHF 0 HP 653A Test Osc. ,10 Hz-10 MHZ,Video Mod $160.00 5850.00 HP 11720A Pulse Modulator. 2 -18 014z $1,200.00 ES .I SR1010 Resistance Transfer Standards TEK 1411R-0pt 04 RAL Test Signal Generator 52.750 00 $2,750.00 HP 86401 Signal Generator. 0 5-512 MHz $060.00 FLUKE 54504 Programmable TEK 144 MSC Teat Signal Generator $700.00 HP 8640&opt2.3 Signal Generator .... $2,600.00 Resistance Standard TEK 147A NTSC Test Signal Gamma*, $960.00 005% $160.00 05-1024 MHz GR 1409 Standard Mica CaPacran. TEK 521A 608, Vec01,006e $1,600.00 10-520 MHz $760.00 1 $276.00 HP 86548 Signal Generator, GR 1432 -N 5- Ostade Resistor. 0 OHM -11K TEK J16/J0523 Spot Luminance Photometer $000 00 $550.00 MARCONI 2019A Synth Signal Gen . $3.600.00 GR 1433-X 6- Decade Resistor. 01 OHM -111K WOG RM-40 70 MHz Radflink Measuring Set 51,75000 Inductor Sat (4) $500.00 1.51040 MHz HP 164708 Stade HP37204AOp62 2 pal ...... $600 00 5700.00 WILTRON 6742Ao01.01 Synth 99,000.00 ROD-L M500$/ 5000 Volt AC HIPOT Tester Fiber.Opbc HRB Extender 51,950.00 Sig /Sop Gen . 18-40 GHz TEK 578 Curve Tracer, to 2204 $4.000.00 HP 5006A Signature Mulrmaer. HPIB ... $675.00 Tracer 02,250 00 EIP 928op.9201 Programmable TEK 57701/177 Storage Curve HP 59307A HP18 VHF Salton ...... $200.00 to 10044 51,750 00 Sweep Gen.,1 -18 GHz TEK 577D2/177 Curve Tracer, PA R 5206 Lock -In Amplifier. 2 142-200 6112 53,000 00 Frame $550.00 TEK 7CTIN Curve Tracer, to 0 5W $500.00 HP 86200 Sweep Oscillator MICROTEL 4530 Wavepuide TDR. 2.4,6,11 GHz 64,000.00 VISA MASTERCARD OPEN ACCOUNT 90 DAY WARRANTY 10 DAY INSPECTION 151 CIRCLE 313 ON FREE INFORMATION CARD

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www.americanradiohistory.com ALES C_..O1V Unit C, 4) ..4$34403 Tektronix 475A Marconi 2091B & 2092B Tektronix 7104 Scope Package Portable Oscilloscope, 250 MHz BW, White Noise Test Set, measures noise and 1 GHz at 10 mV/ div, 350 pS rise time, dual channel, 5mV/ div sensitivity, 1 intermodulation on wide -band multichan- 200 pS max sweep rate. Includes (2) nS/ div sweep rate. Includes 2 new nel telephony systems, suitable for 12 7A29 amplifier, (1) 7B 10 delayed time Probe Master Probes, operator and channel to 2700 channel systems. base, (1) 7B15 delaying time base service manuals. $ 9000.00 Special $ 1000.00 Per Set Tektronix 7D01/ DF2 Tektronix 7704A Logic Analyzer plug -in, stores up to Tektronix 1720 Vectorscope DC to 200 MHz, CRT readout. Comes 1024 channels, state or timing, up to Simultaneous Channel A and B display, with the following plug -ins; (2) 7A26 100 MHz sample rate, includes (2) dual -filter display, one -button front -panel dual trace amplifier, (1) 7B80 delayed P6451 probes. recall, differential phase and gain time base, & (1) 7B85 delaying time base $ 500.00 measurement. NTSC . $ 1300.00 .e.tron,x i 71.1,1 acope i ac..age $ 1650.00 Tektronix 466 500 MHz Oscilloscope mainframe with Tektronix 1721 Vectorscope Portable Storage Oscilloscope, 100 MHz the following plug -ins; (1) 7A24 dual PAL system applications. BW, variable persistence, 3000 div/ uS trace amplifier, (1) 7A26 dual trace $ 1650.00 stored writing speed. Special includes 2 amplifier, (1) 7B85 delaying time base, probes and the operation manual. (1) 7B80 delaying time base. Tektronix 1470 $ 2000.00 Sync and Test Signal Generator, full color sync generator with genlock, composit Tektronix SPG -170A video output, 9 test signals. NTSC Sync Generator, digitally $ 1200.00 generated RS -170A black burst, digital genlock, high stability subcarrier, Tektronix 1735 Waveform Monitor flexible pulse outputs. PAL/ NTSC dual standard applications. $ 995.00 $ 1750.00 $ 1850.00 DM 5010 Tektronix SPG -271 Tektronix Programmable Digital Multimeter plug -in PAL Sync Generator. Tektronix PG 2012 4.5 digit, .015% accuracy, autoranging, $ 1750.00 Programmable Pulse Generator, dual math functions (dB, average, offset, scale,. channel, selectable 250 ps, 800 ps or 1.8 hi/low /pass test, true RMS, diode test. Tektronix 2213A ns, variable 5.5 ns to 10 ms transition $ 60 MHz Oscilloscope, 2 mV sensitivity, time. 875.00 5 nS /div sweep rate, advanced trigger $ 2500.00 system, lightweight large, bright CRT. Tektronix 7854 Scope Package $ 675.00 Wandel & Goltermann TSA -1 Waveform processing oscilloscope, stores Transmission System Analyzer, 100 Hz up to 400 MHz BW, IEEE -488 interface, to 180 MHz, spectrum analysis, selective Wandel & Goltermann SPM -16 comes with (1) 7A26, (1) 7A22, & (1) level, demodulation, phase jitter. Selective Level Meter, 10 Hz to 7B85. 160MHz, high frequency accuracy, $ 3000.00 uncertainty less than 1 x 10.7, digital Above with (1) 7D15 universal counter/ and analog display. timer. $ 3500.00

Tektronix 7834 Storage Oscilloscope 2500 cm/uS stored writing speed, stores single shot rise time as fast as 1.4 nS, DC to 400 MHz. Multimode storage. Comes with (1) 7A19, (1) 7A26, (1) 7B85, & (1) 7B80. $ 2550.00 $ 2250.00 Special same as above but includes netwodc analyzer OUR NEW CATALOG IS HERE. $ 2750.00 Special PLEASE CALL OR WRITE FOR WANTED TEST EQUIPMENT $ 975.00 special A FREE COPY. Call or fax us your list! 153

CIRCLE 235 ON FREE INFORMATION CARD www.americanradiohistory.com STOPPING POWER METERS Tor` repode. P 0 'I -: c ie- .- vices can slow down - even slop - watthour meters - EPROM+ \ whlle loads draw lull Vowed Device simply plugs Into -l one outlet and normal loads Into other outlets. Also de- PROGRAMMING SYSTEM scribes meter creep, ovedoad droop, etc. Plans 529- :,HILAI )S11 1.0. MANUAL: Exlemal magnetic ways (applied to the meter Itself) to slow down and stop watthour meters NEEDS NO C O N S U M E R T R O N I C INTERNAL CARD 8 while lull loads. Plans. 2011 Cr..c.nt Dr., P.O. Drawer 637 drawing $19. K1NB (PROMS (24, 21 and 32 pins) EFPROMS & NVRAMS E modes How meters work, callbratbn, _ Alamogordo, NM 1702 *, 2708, 2758, TMS2716* 2804/16A/C 16/17A, 2864/C64' a 88310 error modes (many), ANSI Standards, etc. Demand and 2716/C16,2516/32 164 *,68764* 28256/C256, 28C010,X2210/12 Voice: (505) 434 -0234 434.1778 Polyphase Meters. Expedmental results to slow and RAM - meters 2732 /32A/C32,2764/64Á/C64 s,RIAI EEPROMS "(8 PIN) 8PM MST, Mon -Sal 5to. b others. 19. An 2 $38. All 3 $59. FAA: ( get 27128 /128A/C128,27256/C256 '`:. 2401/02/04/16,2444,8572 /82/92 AUTOMATIC TELLER voice, en(e505) 3 -0224-h(or ere ÿiffly u MACHINES 27512/C512,27513 */C011* 9306/46/56/66,ER1400,M58657 TM crimes, abuses, vulnerabilities and defeats ex. Em (relates directly to your 27C010, 27C 1001, 27CO20 CONTROL! ERS Seah_$upp nrs Vosedl 100+ methods detailed, Include: Physical, Reg. MICRO orderf or prospective order): Tues. and Thurs. only. - E, 27C2001,27C040,27C4001 8741/42/48/49,8751/C51/C52 cipher, PIN compromise, card counterfeiting, mag- . _, Add total 541 (US. Canada). 40 PIN F.PROMS "1.2 &4 MEG 87C5XX, 87C6XX, 87C751ß $5 AA Items N stock. VISA, node stripe, false front, TEMPEST, Van Eck. taPPNIT. MCard OK ($29 min.. No COOS or VD me's. New 27C1024,27C2048,27C4096 21.1 68705, 68HC705, P1C16C5X log (150+ otters) Is $2 vorder. $4 vat (Oil-Oee_Catalgg). 27C210, 27C220, 27C240 we BIADLIR PROMS Cata-voltage - others. Case histories, law, countermeasures, Since 1971. As seen on N. etc. Joan Wltllame - former - Lock detailed security checklist labeled Internal photos, fig - FLASHEPROMS 82SXXX, 74SXXX (16-24 PIN) heed Senior Engineer, NMSU Professes, Computer Science urns. ATMs contain up to $250,000 In cash) Recent 28F256/512/010/020 ADAPTER REQUIRED NM Heats Physicist. MAC lid. portable or Seller. WARM $350 000 ATM crime s. still unsolved) $39. 29CXXX, 29FXXX Diagrams with manual AII software supports all IBM -PC corn. allbie 588 stems 8088 Pentium CREDIT CARD SCAMS CONNECTS 70 YOUR IBM OR COMPATIBLE DESKTOP, LAPTOP OR NOTEBOOK VIA THE Off-The-Shelf HARDWARE Cardholders, merchants, banks sutler Billions In losses annually because of credit card fraud. Describes PARALLEL Van Eck ystems, Automated Tempest Module, KX Ra- PRINTER PORT every known means of credit card fraud and scams. dar Emitter, Carlacking Foller, Personal Body Alarm, SMALL, RUGGED PROGRAMMING UNIT (8'X7'X3 WITH COVER AND CARRY HANDLE Protect yourself! $29. EXPANDABLE DESIGN SUPPORTS OVER 500 CHIPS PLUS ADAPTS TO NEW DEVICES Voles Disguiser, Hearing Asslslor, Shriek Module, EM .AUTOMATICALLY SETS PROGRAMMING VOLTAGE - NO PERSONALITY MODULES Countermeasure, °mnimes TENS, 6th Sense Communl. CONS & SCAMS 4R1: AI)S AND CONVERTS INTEL HEX, MOTOROLA S- RECORD AND BINARY FILES calor, many nifty Phone Boxes, Bumper Beeper, Sub- ons scams eece encans o II+ SI on per .11 RDWARE PROTECTED AGAINST DEFECTIVE AND INCORRECTLY INSERTED DEVICES tlminal Mixes/Amp, Rile :NPPROVED Device, Neurophone, Hlerony. yearl The most comprehensive survival manual on cons PROGRAMMING ALGORITHMS - MOST DEVICES PROGRAM IN UNDER 60 SEC. mus Machine, Magnetometer, Data Cord Reader/Writ- 6 scams of all kinds - from the classic to hi-tech. De- ers, Dwelling Security System, Imitator, Vortex Gen - tolls on 1005 and their many variations. Protect your - EASY -TO -USE SYSTEM SOFTWARE orator, Ultrasonic Jammer 6 Receiver, Long -Range sell $29. READ PROGRAM DEVICE FROM DISK COMPARE DEVICE Eavesdropper, Noise Cancellation System, Unknown Presence Detector, Electronic Pal HIGH VOLTAGE DEVICES PROGRAM SAVE BUFFER TO DISK DEVICE CHECKSUM Dowser, Automatic Feeder Stealth Paint - man morel See our Calais.. IN devices plans: Stun un, Toser, Prod, one, COPY LOAD BUFFER FROM DISK INSPECT DEVICE CELLPHONE MODIFICATIONS Flasher, Blaster, Zapper, AudiolSFRadar Jammer, BLANK CHECK BYTE SPLIT/SHUFFLE SELECT DEVICE TYPE Jacob's Ladder, Plasma 6 Van de Graall Reno., Fence Dui olalog or OUT famous cellpnone modification Charger, Geiger Counter, Ozone CI 12 Fish Stunner, PLUS AN INTEGRATED FULL SCREEN BUFFER EDITOR WITH 20 COMMANDS guide ($69) - detailed, comprehensive, covers al makes - Plant Stint., Klrllan, morel Shockin 1 529. 10 limes more Info than competitor's guldes- . (Do S' a-ti- SYSTEM INCLUDES: PROGRAMMING UNIT, POWER PACK CONNECTING CABLE, OPERATION MANUAL & SOFTWARE dal Pro eels below for u. -to -date hardwaretottware . UNDER ATTACK! v7 ediamagnetic nier erence a . eclron c "eapon SOFTWARE SUPPLIED ON BOTH 3 IR AND 51W DISK $289$ SPECIAL PROJECTS MINIATURE. 4 CHIP EPROM ERASER WITH TIMER - S49.OB OTIONAI. SOFT TRAVEI. CASE - 519.011 Attacks cause: Cancer, birth defects, and profound psy- e .es pit, .ul ., repair, mo.I y, maintain an. -or consult stemcal, orders) Des cardiovascular e TO ORDER SEND CHECK, MONEY ORDER, WRITE OR CALL: any device, system, process or project - electrical, s stem disorders) Destructive to people, aImals,animals, electronic, computer, phone, mechanical, optical, auto- ants, equ)pmenll Includes OF EM ANDROME RESEARCH motive. invention prototyp)ng. Confidentiality guaranteed. GAS r!AI we investigated)!Indeeiecboni includes how ILL P.O. BOX 222 Describe and Include $25 pre -engineering lee (does not ifyHPPLE verity and pinpoint EMI and s. $_29. aback sources, MILFORD OHIO 45150 obli.ate ou . Time and cost esfimates In 7-10 da s. (513) 831- 9708 -- -- ADD 55.00 FOR SHIPPING: VOICE MAIL HACKING Tutorial and pans for FAX ( 513) 831 -7562 ADD 53.00 FOR C.O.D. sumpssLAB Vo co Mail Box (VMB) systems are used and the ELECTROMAGNETIC WEAPONS and LAB DEVICES. MADE IN THE USA. - WRITE OR CALL FOR MORE INFORMATION OR A DATA SHEET i specMc ways they are hacked. Includes ASPEN, MES- Optimum circuits, !reps, waveforms, duty cycles, Aten- SAGE CENTER, BIX, GENESIS, E2, SYDNEY, PHONE sities. Thomu.h. $29. Both $49. MAIL, AUDIO, CINDY, CENTIGRAM, SPERRY LINK, RADIONICS MANUAL RSVP, etc. Absolutely required for all users, sysops and citing e ecloca , e an. e ectromagne era - secud ersonnell 529. eon* peudc, diagnostic and preventive devices (mostly ex- ' ' perimental). History, descriptions, plans (dozens), avail-

s of s are ac tie lo 1 e lune of r ion r abilities of Radlonles Devices from early to modem. While 'VOICE MAIL HACKING' details haw VMSs are While drugs cost S Hundreds, electricity costs pennies! Radiotelephone - Radiotelegraph hacked for 'phun and profit - Including VMS methods 529. HEAL THYSELF: Plans for 3 major elec- tor hacking PBXs themselves - 'PBX HACKING' ad- Ironic therapeutic devices of types approved by FDA. dresses ALL Issues relating to PBX hacking, Including 519. Both 539. countermeasures! Can your business or agency aNOrd a HARD DRIVE MANUAL $90.000 phone fraud loss (the average loss due to Covers all hard drive and controller implementations hacked PBXs 7 As described in Forbes Magazine. $39. Commercial (emphasis on PCs). How to select Interface, Initialize, PHREAKING CALLER ID & ANI set up, use, maintain, troubleshoot and repair them. Fcc I ..1 s on ow 1 ey w. an.:ozens o e ' nine ways How to protect them from mistakes, sabotage, prying of defeating Caller ID, ANI, '69, '57, and Cal Blocking eyes and sticky fingers. How to recover damaged and License Also describes 10, lost files. How to prevent crashes. Includes software re- and '67. Caller Orange, Beige, Cheese and CF Boxes, ESS, SS?, E-911, various views. Loaded with information, advice, bps. $29. CLASS services, CNA, NON PUB DA, CAMA, DNR, DISK SERVICE MANUAL: Maintain, trouble- 80O -ECR Dlverters LD Extenders Centres - more. $29. shoot repair, adjust align floppies without special Why Take Chances? PHONE COLOR BOXES equipment or software. 3.5,5.25, PCXVA11I5' 486, Apple, Commodore, etc systems. AI floppies need I As designed by Phone Phreaksl 15 hone color boxes occasional pp tica. DISK DRIVE TUTOTUTU- described. Dozens of circuits, simulator programs. Plus Discover how easy it is to pass the exams. incALn Theory, practical floppy matti gSkN- call- forwarding, conferencing, phreak history, I 50 useful Including many tips, recommendations, S69.tlng, In- Study with the and ie.aI .hone circuit .cans - more. 529. most current materials available. Our I leriacln., FDC etc. $24. An 2, $49. M 3 569. Homestudy Guides, Audio, Video or PC "Q &A" disks I ROBOFONE AUTODIALER SOFTWARE PROTECTION SYSTEM 1 versali menu ewe u, e, -.rrven 'imams auto.:- nique system that high discourages costly software aler lets you dial any quantity to 10K) or mix of lo- make it so fast, easy and inexpensive. No college or (up Piracy while not Interfering with legit archival copies. No In length cailong distance numbers any order, over any knovm way to defeat. No special equipment required. 1 experience needed. The new 1 of time, whether busy or ((your and commercial FCC exams answered choice) Simple and automatic to Install on your distributed soft- log the times, commands and results to monitor, printer ware. Compatible with all copy -prevention systems. have been revised, covering updated Aviation, Marine, disk. numbers. and-or directory of up to 600 Manual + DIM' $59. Radar, Microwave, New BUSY redial options. Direct modem command and con- Rules & Regs, Digital I trol. All Result Codes, including VOICE and RINGING. STEALTH TECHNOLOGY Circuitry & more.We feature the Popular "Complete Optional shell to terminal pro ram upon CONNECT. Exit o ice ra.ar Is ascmating a so as error ra es o I- to menu or DOS for batchin. Manual + Disk* 529. 20 %1 Every known error mode - stealth method and ma- Electronic Career Guide ". 1000's of satisfied customers COMPUTER PHREAKING tech) used to minimize radar reflections - tactic and , I strategy to fight unjust radar tickets that cost you ' ' I " G ' etc. (wee to pass or money back. Newest Q &A pools. $togs kn Insurance and risk cancellation - methods to Includes countermeasures. disk with 360k of hacker detect and .m signals -lull described! 529. text files and utilities, and legendary FLUSHOT+ protec- Send for FREE 1 I DETAILS or call lion system (Editor Choice, PC Magazine). Dozens of SECRET & SURVIVAL RADIO computer crime and abuse methods and countermea- 'plrmum SLIMY. an. security ratio equipment me - 1- 800 -800 -7588 sures. How systems are penetrated. BIS advice, ass- ode, keg allocations and volcellata scrambBngtncod- word defeats, glossary - much morel Manuals + Ing. Includes small receiversdransmitters, telemetry, an- Disks $39. Senna optimizations, remote monitoring and control, se- WPT Publications surveillance, fiber-optic Infra- BEYOND VAN ECK PHREAKING red commix 70+ kc ft ans tables. 1 7015 N.E. 61st Ave Dept. 10 I av85.roppIng on T an. computer woo signa s using an ordinary N) Includes security industry reports. Range ' up to 1 KM. Plans Include both the Consumerironlcs and n erpal arasse or a use erupt, ale 1 Vancouver, WA 98661 I the ori.lnal To. Secret Van Eck desk no! 529. Taken for granted? Stuck In a dead -end job? Can't find a aid CRYPTANALYSIS TECHNIQUES good job? Expect to be off, fired or transferred soon? The ultimate no-holds-barred, looking- after -I1 Five powerful menu-driven cryplo programs (in . OM Name I lobs) obtain, optimize and and thek .BAS sources) to analyze, decrypt 'secure' cl- keecphtop pay landsbenefits. THE OFT E phedexts. Worked -out examples. Recommended in yes- GAME FOR A GAME WITHOUT RULES! From first re- u.lous'on - uteri 6 Securl . Manual +Disk' $29. sum, to CEO. $29. 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www.americanradiohistory.com USE ELECTRONIC SHOPPER CLASSIFIEDS READ BY MORE THAN 100,000 ELECTRONICS BUYERS AND SELLERS AND TRADERS INSTRUCTION FOR PLACING YOUR AD!

HOW TO WRITE YOUR AD $18.75 per ad per insertion (15 words). Any words that you want PRINT your classified ad copy CLEARLY (not in all TYPE or set in bold or caps are 200 each extra. Bold caps are 400 each If you to place more than one capitals) using the form below. wish extra. Indicate bold words by underlining. Words normally written ad, a for the additional ads (a photocopy of use separate sheet in all caps and accepted abbreviations are not charged as all -caps from the list below and this form works well). Choose a category words. State abbreviations must be Post Office 2- letter abbrevia- into the space at the top of the order write that category number tions. A phone number is one word. form. If you do not specify a category, we will place your ad under Miscellaneous or whatever section we deem most appropriate. CONTENT All classified advertising in the Electronic Shopper is limited to Payment in full must accompany We cannot bill for classified ads. electronics items only. All ads are subject to the publisher's ap- in the same your order. We do permit repeat ad or multiple ads proval. We reserve the right to reject or edit all ads. issue, but in all cases, full payment must accompany your order. DEADLINES WHAT WE DO Ads received by our closing date will run in the next issue. For The first two words of each ad are set in bold caps at no extra example, ads received by April 1 will appear in the July, 1993 issue positioning, centering, dots, extra space, etc. charge. No special that is on sale in June 3. Shopper ads will appear Jan., Mar., May can be accommodated. etc. No cancellations permitted after the closing date. No copy RATES changes can be made after we have typeset your ad. NO RE- Our classified ad rate is $1.25 per word. Minimum charge is FUNDS. advertising credit only. No phone orders.

AD RATES: $1.25 .er word, Minimum $18.75. Send your ads with payment to Electronic SHOPPER, 500 -B Bi- County Blvd. Farmingdale, NY 11735 CATEGORIES Repairs -Services 100 Antique Electronics 270 - Computer Equipment Wanted 450 - Ham Gear Wanted 630 - - Satellite Equipment 130 Audio -Video -Lasers 300 - Computer Hardware 480 - Miscellaneous Electronics For Sale 660 - - Security 160 Business Opportunities 330 - Computer Software 510 - Miscellaneous Electronics Wanted 690 - - Telephone 190 - Cable TV 360 - Education 540 - Music & Accessories 710 - Test Equipment 210 - CB- Scanners 390 - FAX 570 - Plans- Kits -Schematics 720 - 240 - Components 420 - Ham Gear For Sale 600 - Publications CLASSIFIED AD COPY ORDER FORM

Ad No. 1 -Place this ad in Category #

- 31 - $38.75 32 - $40.00 1 - $18.75 2 - $18.75 3 - $18.75 4 - $18.75 29 - $36.25 30 $37.50

- - $42.50 35 - $43.75 36 - $45.00 5 - $18.75 6 - $18.75 7 - $18.75 8 - $18.75 33 $41.25 34

- 39 - $48.75 40 - $50.00 9 - $18.75 10- $18.75 11 - $18.75 12 - $18.75 37 - $46.25 38 $47.50

x $1.25 per word = $ 13- $18.75 14- $18.75 15- $18.75 16 - $20.00 Ad No 1 -Total words

All Caps words x .20 per word = $

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101-Key Keyboard New. XT AT swltchable. (92C011) $24.85 4MB EPROMs SILVER SOLDER Used, blank (944002) Rosin core, 60% Tin, 36% Lead, 4% Silver, TOM INON 0.31' diameter, 1 lb. spool. (93Z027) RESISTOR RIOT $19.95 HI -POWER 1/8, 1/4,1/2, Watt., precision, fixed, adjustable, GLASS LENS etc Thousands of pieces. (92023) 5 LOS. 1:4.5, f =230mm (91, $4.95 weight, 4 lbs. Six for coated glass lenses, symmetric, in black aluminum case. All °0 ?'S' STEEL ENCLOSURES well for a 50° angle aberrations are corrected Features include ventilation holes, self -adhe- macro LIQUID CRYSTAL DISPLAY of view, and especially well for projec- sive rubber feet. Front and real panels are tion. Scale range is from 1:10 through 1:1 to 0.05' aluminum alodine painted white. Top LIQUID CRYSTAL 2 line by 40 characters Specs included 10:1. Make a telescope with our 'Precision and bottom covers are 0.04' phosphated steel SHUTTERNARIABLE (94L005) $14.95 each Objective Lens' (92L031) and instruction sheet. painted black. DENSITY FILTER Other applications include: high quality image E31194 (2.5'x8'x7') $12.95 projection at macro scales, or portrait photog- E3119B (2.5' x 12' x 7") 15.95 0.5' to 0 9- active area. 0% to 23% transmis- 738 330 Meg PRIAM MODEL raphy in formats up to 6' x 9'. Originally cost E3119F(2.5'x17 "x11) 19.95 sion. Switches at up to 250 nanoseconds. SCSI Drive, wrrh DTC55280 controller, over $350.00. UNUSED. (92L034) E3119G(3.5'x8'x7') 13.95 Specs included. (92L012) $9.95 24.95 Only cable,& software, formatted. $39.95 E3119K(3.5'x17'x111 E3119P (5.2' x 17* x 111 29.95 (94C017) $349.00 RAPIDSYN STEPPER MOUSE MOTOR 34D -9106A 2.9VDC, 3A, 1.8 Deg /step. 82 mm Microsoft and Mouse Fsl square 62mm deep, 10mm shah. Used Systems compatible , 7 for IBM/compatible (94M004) $24.95 systems. Works with -._. all major application software. Dynamic resolution and fast tracking speed. Opto-mechani- TREADMILL DISPLAY LATTICE- NET 10- Base -T cal encoder Model eG25200000 -C. (93C019) LCD display offers speed, time, distance and CONCENTRATOR SILICON VALLEY TRIBBLE scan modes as well as readout for Kcal./min. $9.95 MAY SPECIAL FREE SYNOPTICS mode12500 -01 or 2510 -OIE. New When tossed, these chirp like bats. Operates on 5VDC. Uses +5V pulses to oper- in box complete with power supply, documen- ated readout. Many applications. 1931/0131 MOUSEPAD, when you order the above taten (94C018( $79.00 (947001) $3.95 each $5.95 each mouse, get the mousepad free.(94C004) (reg. 996 each)

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CIRCLE 215 ON FREE INFORMATION CARD

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DISPLAY HOLDER 200.0 1741A, 100 MHz PORTABLE O'SCOPE 800.00 8443A, TRACKING GEN /COUNTER, LED DISPLAY 700.0 182T, DISPLAY SECTION 650.00 8444A, TRACKING GENERATOR, 0.5 -1300 MHz 800.0 204C, AUDIO OSCILLATOR, 4Hz -10MHz 250.00 8445B, AUTOMATIC PRESELECTOR 700.0 313A, TRACKING GENERATOR, 10 kHz -22 MHz 250.00 8447A, AMPLIFIER, 0.1=400 MHz 300.01 3300A, FUNCTION GENERATOR., .01Hz- 1000MHz 300.00 8552A, IF SECTION 500.0 3305, SWEEP PLUG -IN, .1Hz- 1000kHz 50.00 8552B, IF SECTION, SWITCH DISP. MODES 750.0 3312A, 13 MHz FUNCTION GENERATOR. 800.00 8553B, RF SECTION, 0-110 MHz 500.01 331A, DISTORTION ANALYZER 225.00 8553L, SPECTRUM ANALYZER -RF SECTION 350.01 3400, RMS VOLTMETER 300.00 8554B, RF SECTION, 0.1 -1250 MHz 800.01 3403C, TRMS DMM, 3.5 DIGIT, 1.6Hz-10kHz 450.00 8555A, RF SECTION, 10 MHz -18 GHz 800.01 3406A, BROADBAND SAMPLING VOLTMETER 800.00 8556A, LF SECTION, 20 Hz-300 kHz 500.01 3437A, HIGH SPEED SYSTEM DMM,1000 R/SEC HPIB 350.00 85B, COMPUTER 350.0 3440/3444A, DIGITAL MULTIMETER 75.00 8614A, SIGNAL GENERATOR, 0.8-2.4 GHz 375.01 3455A, 6-1/2 DIGITAL MULTIMETER 700.00 8620A/8621A, SWEEP OSC. SYSTEM 0.1-4.2 GHz 600.01 3467A, LOGGING MULTIMETER, 4.5 1000.00 8620C/011, SWEEP OSCILLATOR MAINFRAME, HPIB 550.0 3469B, MULTIMETER, DIGITAL /ANALOG READOUT 275.00 86222A, RF PLUG -IN, 0.1-2.4GHZ 400.01 3490A, DMM, 5 DIGIT 275.00 86222B, RF PLUG -IN, 0.1- 2.4GHZ 1700.01 3555B, TRANSMISSION & NOISE MEASUREMENT SET 200.00 86222B/002, RF PLUG -IN, 0.01 -2.4 GHz 1800.01 3581A, WAVE ANALYZER, 15 Hz -50 kHz 1200.00 86230B, RF PLUG IN, 1.8 -4.2 GHz 400.01 3581C, SELECTIVE VOLTMETER, 15HZ-50KHZ 1500.00 86240B, 2- 8.4GHz PLUG 200.01 3582A, SPECTRUM ANALYZER, .02Hz- 25.6Hz 5000.00 86241A/001, RF PLUG IN, 3.2-6.5 GHz 400.0 3586B, SELECTIVE LEVEL METER 1000.00 86245A, RF PLUG -IN, 5.9- 12.4GHZ 250.01 3702A, IF/BB RECEIVER 2000.00 86260A, RF PLUG -IN, 12.4 -18GHZ 800.01 400E, AC VOLTMETER 55.00 8640B, SIGNAL GENERATOR, 0.5 -512 MHz, AM /FM 1400.0 410C, VOLTMETER 150.00 8683B, SIGNAL GENERATOR, 2.3 -6.5 GHz 4000.0 415E, SWR METER 150.00 8740A/H18, TRANSMISSION TEST UNIT, DC -18 GHz 100.0 419, DC NULL METER 75.00 8742A, REFLECTION TEST SET 500.0 431, POWER METER 75.00 8745A, S- PARAMETER TEST SET, 0.1- 2.0GHZ 675.04 431B, POWER METER 100.00 9278A, PLOTTER 125.0 431C, POWER METER 150.00 432A/478A, PWR MTR, 0.01 -10 GHz, -20 dBm TO +10 dBm 300.00 435A, POWER METER 450.00 TEKTRONIX 435A/8481B, PWR MTR W /SENSOR, 1 mW -25 W, 0.01-18 GHz...1325.00 1240, LOGIC ANAL W/ 2 D2 CARDS, 36 CHANNEL 1000.0 436A/03./002 DIGITAL PM w/ HPIB $900.00 1241/D2 D2, LOGIC ANAL, 36 CHAN, 50 MHz, CLR DISP 2000.0 436/8484 DIGITAL PM /SENSOR $1500.00 144, NTSC TEST SIGNAL GENERATOR 700.0 461A, AMPLIFIER 200.00 147, NTSC TEST SIGNAL GENERATOR $600.0 4800A/4801A, VECTOR IMPEDANCE METER, 5 Hz -500 kHz .550.00 184, TIME MARK GENERATOR 50.0 491C, AMPLIFIER, TWT. 2-GHZ, 1W 30DB GAIN 2000.00 2213, 60MHz DUAL CHANNEL O'SCOPE $600.0 4935A/003, TRANS TEST SET, AC & BATT. PWR 1250.00 2215, 60MHz DUAL TRACE O'SCOPE $800.0 5004A, SIGNATURE ANALYZER w/ PROBES 250.00 2235, 100MHz DUAL CHANNEL O'SCOPE $1200.0 5245L, 50MHz FREQUENCY COUNTER 75.00 2245, 100MHz, CH 34 for DMM MEASURE $1700.0 5246L, FREQUENCY COUNTER 75.00 2246, 100MHz 100MHz ON SCREEN DMM $1900.0 5253B, FREQUENCY CONVERTER, 18GHz 350.00 2445,150MHZ CURSORS $2500.0 5300B/5305B, MEASURING SYSTEM 450.00 2465, 300MHz 4 CHANNEL O'SCOPE $3500.0 5302A, UNIVERSAL COUNTER, 50MHZ 150.00 434, STORAGE O'SCOPE, 25MHZ 500.0 5305B/5300B /001, 1.3 GHz COUNTER WITH TCXO REF 450.00 465B, 100MHz DUAL VERT. /TIME O'SCOPE 675.0 5312A, HP -1B INTERFACE 100.00 466, 100 MHz VERT./TIME STORAGE O'SCOPE 1100.0 5314A, 100 MHz /100 nS UNIVERSAL COUNTER, PORTABLI: 250.00 475, 200 MHz DUAL CHANNEL O'SCOPE 750.0 5315A, UNIVERSAL COUNTER 500.00 475A, 250MHz DUAL CHANNEL O'SCOPE 825.0 5326C, UNIVERSAL COUNTER, 50MHz 100.00 485, 350 MHz DUAL VERT./TIME O'SCOPE 900.0 5328A, TIMERCOUNTER, 500MHz, DUAL CHANNEL. 250.00 491, SPECTRUM ANALYZER 10 MHz-12.4 GHz 950.04 59500A, MULTIPROGRAMMER INTERFACE 500.00 492, SPECTRUM ANALYZER, 50 kHz -21 GHz 5950.04 6110A, 3000V AT 6mA DUAL POLARITY POWER SUPPLY 275.00 528, TELEVISION WAVEFORM MONITOR 500.0 6111A, PRECISION POWER SUPPLY, 0-20V, 0-1A. 275.00 5440/D40, 50 MHz THREE SLOT FRAME 225.0 6130B, BIPOLAR DIGITAL PROG. POWER SUPPLY, + /- 500A 600.00 577/D2, CURVE TRACER 1505.0 6131B, CVCC, PROG., +/- 100 @5A 1500.00 5A22N, DIFFERENTIAL AMPLIFIER 400.0 6186B, DC CURRENT SOURCE, TO 300V, 100mA 450.00 7623A, MULTIMODE STORAGE O'SCOPE, 100MHz 375.0 6200B, 40V/20V AT 0.3A/0.6A CVCC POWER SUPPLY 200.00 7633, 100 MHz STORAGE,1000cm /uS WRITING 600.0 6201, 0-20V, 0 -1.3A, THREE UNITS 175.00 7704, 150MHz, FOUR SLOT FRAME 250.0 6255A; DUAL DC POWER SUPPLY, 40V AT 1.5A 450.00 7704A, 250 MHz FOUR SLOT FRAME 325.0 6264B, 20V AT 20A CVCC POWER SUPPLY 500.00 7834, 400 MHz STORAGE, 2500 cm /uS WRITING 750.0 6267B, 0 -400 AT 10A CVCC POWER SUPPLY 700.00 7834, 400 MHz SYS, W/ (1)7A24,(1)7A26,(1)7B80,(1)7B85 1150.0 6282A, 10V AT 10A CVCC POWER SUPPLY 275.00 7844, 400 MHz DUAL BEAM FRAME 900.0 6284A, 0-20V DC AT 3A DC POWER SUPPLY 275.00 7904, 500 MHz FOUR SLOT FRAME 450.0` 6291A, 40V AT 5A CVCC POWER SUPPLY 375.00 7904, 500 MHz SYS, W/(1)7A19,(1)7A26.(1 )7B80,(1)7B85 1000.04 6299A, 100V AT 750mA CVCC POWER SUPPLY 275.00 7A13, DIFFERENTIAL COMPARATOR, LED DISPLAY 400.0. 6439B, 0-60V DC AT 15A DC 600.00 7A14, CURRENT PROBE AMPLIFIER, 120MHz 175.04 6448B, 600V AT 1.5A CVCC POWER SUPPLY 700.00 7A18, 75 MHz DUAL TRACE AMP 100.04 652A, AUDIO OSCILLATOR, 10Hz -10MHz 275.00 7A19, 600 MHz AMP 250.04 6824A, POWER SUPPLY /AMPLIFIER, 50V lA 300.00 7A24, 400 MHz DUAL TRACE AMP 450.01 6940B, MULTIPROGRAMMER 500.00 7A26, 200 MHz DUAL TRACE AMP 200.01 6942A, MULTIPROGRAMMER 1500.00 7A29, 16Hz VERT. PLUG 800.01 174 775D, DUAL DIRECTIONAL COUPLER, 450- 950MHZ 250.00 7A42, 4 CHANNEL LOGIC TRIG. VERT. AMP., 350MHz...1500.0

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COUNTER 1350.00 LEADER LDM 170, DISTORTION METER 400.00 DC503, DIGITAL COUNTER PLUG -IN, 100MHz 350.00 LEADER LMS-3100, TV SOUND METER 300.00 DC503A, 125 MHz UNIVERSAL COUNTER 500.00 LH RESEARCH 137A, PULSE GEN, 125MHz -10Hz 300.00 DC504, COUNTER /TIMER, .1Hz -80MHz 185.00 MAGNAVOX T- 23893, CHART PRINTER 200.00 DC505A, 225 MHz UNIVERSAL COUNTER 250.00 MARCONI 2304, MOD METER 400.00 DC509, 135 MHz UNIVERSAL COUNTER /TIMER 700.00 MARCONI 2337A, AUTOMATIC DISTORTION METER 400.00 DD501, DIGITAL DELAY 350.00 MARCONI TF2300B, AM /FM MOD METER 500.00 DM501, DMM MODULE, 4,5 DIGIT DISPLAY 275.00 MARCONI TF2370/TK, SPECTRUM ANAL., 0 -1250 MHz....3000.00 DM5010, PROGRAMMABLE 4-1/2 DIGIT DMM 350.00 MAYNARD MAINSTREAM 150, 150MB EXT. TAPE DRIVE FOR DM501A, MULTIMETER, 4.5 DIGIT 300.00 PS /2, UNUSED & COMPLETE 300.00 DM502, MULTIMETER, 3.5 DIGIT 175.00 MEASUREMENTS CORP 80 , SIGNAL GENERATOR 300.00 DM502A, MULTIMETER, 3.5 DIGIT 225.00 MICRO TECHNICAL INDU 358 THERMO PROBE 400.00 FG501, 1 MHz FUNCTION GENERATOR 250.00 MICROTEL SG800, SWEEP SIGNAL GEN .1GHz-18GHz....3000.00 FG502, 11 MHz FUNCTION GE RATOR 250.00 MILLIVAC 828A 300.00 FG503, 3 MHz FUNCTION GENERATOR 250.00 MILLIVAC MV-823B -S1, RF MILLIVOLTMETER, 10 kHz -1.2 GHz, FG504, 40 MHz FUNCTION GENERATOR 900.00 lmV -10V, W /ADAPTERS 375.00 P6015, 1000X 40kV PROBE, AC /DC 300.00 PHILLIPS 3226, O'SCOPE 300.00 PG501, 50 MHz PULSE GEN. 300.00 PHILLIPS 5512, NTSC TV PATTERN GENERATOR 250.00 PG508, 50 MHz PULSE GEN 500.00 PHILLIPS PM2454B, AC MILLIVOLTMETER 200.00 PS501, POWER SUPPLY 100.00 PHILLIPS PM3225, O'SCOPE 300.00 PS501 -1, 0 -20V PRECISION POWER SUPPLY 150.00 PHILLIPS PM6302, RCL BRIDGE 250.00 PS5010, PROGRAMMABLE TRIPLE POWER SUPPLY 750.00 PHILLIPS PM6611, UNIVERSAL COUNTER 250.00 PS503A, DUAL POWER SUPPLY 250.00 POWER DESIGN 2005A, PREC PWR SRCE, 20V, 500mA 200.00 R5103N, RACK MOUNT O'SCOPE 200.00 POWER DESIGN 2K -10, 0 -2000V 0-10mA CV PWR SUP 200.00 SC502, DUAL TRACE O'SCOPE PLUG, 15MHz 475.00 POWER DESIGN 6050A, UNIV DC SOURCE, TO 60V, 5A....200.00 SC504, 80 MHz O'SCOPE 475.00 RACAL -DANA 1250, UNIV SWITCH CONTROLLER 300.00 SG502, AUDIO OSCILLATOR 300.00 RACAL -DANA SERIES 6000, MICROPROCESSING DMM...350.00 RACAL-DANA SERIES 9000, TIMER COUNTER 9 DIGIT...250.00 RADIO RESEARCH 41, AM /FM SIGNAL GENERATOR 200.00 RADIOMETER COPENHAGE SMG1 STEREO GEN .500.00 MISCELLANEOUS RFL INDUSTRIES 829G, AC DC CAL STANDARD 1700.00 SHIBASOKU AS9538, MPX TV SOUND SIGNAL GEN 600.00 AMBITROL 4005, PWR SUP, 0.40VDC, 0 -500MA 175.00 SLAUGHTER 103 -2.5J, 2.5 KVAC HIPOT 300.00 ANRITSU ML422B/31, SELECTIVE LEVEL METER 1100.00 SLAUGHTER 205, MEGOHMETER 20,000 MEG ELEC. 200.00 B &K PRECISION 1850A, FREQ. COUNTER 512MHz 175.00 SYSTRON -DONN 6244A/011, 4.5 GHz PORT CNTER, W/30 BAFCO 920A, FREQUENCY RESPONSE ANALYZER. 750.00 PPB/MNTH OXCO 1500.00 BIOMATION KD101 -D, LOGIC ANALYZER 400.00 SYSTRON-DONNER 712 -2A /809 -A, SPELT ANAL 700.00 BLUE MPR-336E-MP1,ENV. CHAMB w/ CTR SRVOCORDR3000.00 SYSTRON- DONNER M107, PREC DCV SRCE, 0- 1kV /50mA 1500.00 BOONTON 92BD, DIG RF MV METER, 10KHz- 1.2GHz 700.00 TAUTRON MB-1A, PCM ERROR RATE MEAS RE 8 300.00 BOONTON 93A, TRMS VOLTMETER, 10 Hz -20 MHz 125.00 TAUTRON MB -302, BERT REC 300.00 CLIMET CI -3100, OPTICAL PART. TRANSDUCER 250.00 TAUTRON ME-1, PSEUDO RANDOM DATA RATE MOD 250.00 DANA 9000, MICROPROCESSING TIMER /COUNTER 300.00 TAUTRON ME -302, DATA RATE EXTENDER. 300.00 DELTRON SP, CVCC, 10V, 5A, METERED PWR SUP 75.00 TAUTRON ME -502, DATA GENERATOR 400.00 DELTRON SP, 40V, 5A, CVCC METERED PWR SUP 150.00 TAUTRON MN -302, BERT TRANSMITTER 500.00 E.S.I. SP- 2534, 4-1/2 DIGIT LCR METER, GPIB 1000.00 TAUTRON MS -2, UHF PULSE SOURCE 600.00 EIP 451, MICROWAVE PULSE COUNTER 2000.00 TAUTRON MX -302, CRYSTAL CLOCK SOURCE 700.00 FLUKE 1722, IEEE 488 CONTROLLER 750.00 TEXSCAN 7271 250.00 FLUKE 1910A, 125 MHz COUNTERfTIMER 175.00 TEXSCAN WB713, 0- 950MHz SWEEP GENERATOR. 500.00 FLUKE 1920A, FREQUENCY COUNTER, 520MHZ 250.00 THERMOTRON 012005, TEMP LIMIT CONTROL 150.00 FLUKE 1952B, COUNTER/TIMER,TCXO, 2 CHAN. 250.00 TI XDS 500.00 .FLUKE 1953A/02, UNIV TIMER/COUNTER 2 CHAN 350.00 VALHALLA 4440, DMM, AC /DC, V&C, 2K -20M OHMS 75.00 FLUKE 4265A, BIN PROG PRECISION PWR SUP 250.00 VALHALLA SCI 2000 -1, AUTORANG DIG WATT-AMM 750.00 FLUKE 6011A, FREQ. SYN. 10MHz- 11MHz, .1Hz RES 2000.00 VU -DATA PS933, w/975, MINI O'SCOPE w/ COUNTER 500.00 FLUKE 750A, REFERENCE DIVIDER 900.00 VU -DATA PS950, w/975, MINI O'SCOPE w/ COUNTER 700.00 FLUKE 8000A, DMM, 3.5 DIGITS, 5 FUNCTIONS 175.00 WANTABE SR6312, CHART RECORDER 500.00 FLUKE 8120A, DMM 200.00 WAVETEK 1002, SWEEP SIGNAL GENERATOR 500.00 FLUKE 845AR, HIGH IMPEDANCE VOLTMETER 300.00 WAVETEK 116, 1 MHz FUNCTION GENERATOR 225.00 FLUKE 8600A, DMM, 4.5 DIGIT,S FUNCTION 200.00 WAVETEK 134, SWEEP GENERATOR 300.00 GENERAL MICROWAVE 460B-10; 3 HEADS 350.00 WAVETEK 1402A, VHF SWEEP GENERATOR FOR USE w/1502, GENERAL MICROWAVE 476, POWER METER 150.00 1- 300MHz 700.00 GOULD 816, DUAL PIN PORT RECORDER 350.00 WAVETEK 1701, UHF/VHF SWEEP GENERATOR 1500.00 GUILDLINE 91540, TRANSVOLT 4890 STAND CELLS 750.00 WAVETEK 180 2 MHz SWEEP /FUNCTION GENERATOR 250.00 HARRISON LAB 6206A, POWER SUPPLY 40.00 WAVE I EK 1801A, SWEEP GEN, 1 -950 MHz, 75 OHMS 500.00 HITACHI V -151F, PORT. O'SCOPE 600.00 WAVETEK 182A, 4 MHz FUNCTION GENERATOR 275.00 HITACHI V-212F, PORT. O'SCOPE 700.00 WAVETEK 184, 5 MHz SWEEP /FUNCTION GENERATOR 325.00 HONEYWELL 1858/700, OSCILLOGRAPH 2000.00 WAVLiEK 185, 5 MHz LIN/LOG SWEEP/FUNCT GEN 375.00 IBM SYSTEM 9000, CONTROLLER. 3000.00 WAVh1EK 2001A, SWEEP/ SIGNAL GEN, 1 -1400 MHz 650.00 INTERSTATE F31, 3 MHz FUNCTION GENERATOR. 300.00 WAVETEK 3000, SIGNAL GENERATOR, 1- 500MHZ 200.00 INTERSTATE F72, 20 MHz PULSE FUNCTION GEN 450.00 WAVETEK 51, UHF PROGRAMMER FOR USE w/1502 250.00 INTERSTATE P23, PULSE GENERATOR 200.00 WESTON ELECTRICAL IN 759 FOOT -LAMB METER 150.00 175

www.americanradiohistory.com ACCORD ELECTRONIC SYSTEMS, INC.

RADIAL ELECTROLYT1C DIODES TRANSISTORS IC SOCKETS FLOPPY DRIVE CAPACITORS LOW MACHINE HARE 1.44M NS" PROFILE SCREW WRAP 1 AMP RECTIFIER 2N2222A .22 WHITE FACE 8 PIN 04 .16 .32 1N4001 50V .03 2N3055 .65 $34.00 each 2N3904 .05 14 PIN .08 .28 .56 luF 25V .04 1144004 400V .04 .05 16 PIN .10 .32 .64 2.2uF 25V 04 1144007 1KV .05 2N3906 SUPER IDE CARD 2N4125 .09 18 PIN .11 .36 .72 3.3uF 25V .04 INCLUDES 2N4126 .09 20 PIN 12 .40 .80 4.7uF 25V .04 3 AMP RECTIFER - 2 HARD D. CONTR. 2N4401 .05 24 PIN .15 .48 .96 6.8uF 25V .04 1N5401 100V .06 - 2 FLOPPY CONTR. 2N4403 .05 28 PIN 17 .56 1.12 10uF 25V .05 1N5404 400V .07 - 2 SERIAL PORTS 2N5086 .09 32 PIN 20 .64 1.28 22uF 25V .05 1N5408 1KV .08 - 1 PARALLH PORT 2N5087 .08 40 PIN 24 .80 1.60 33uF 25V .06 - 1 GAME PORT 2N5088 .08 47uF 25V .06 6 AMP RECTOR DP PARCHES LED's $21.00 each 2N5089 .09 100uF 25V .08 6A10 100V .19 2N5209 .09 101 KEY IQYBOARD 220uF 25V .08 6A100 1KV .22 RED 3mm .06 2N5210 .09 4 POS. .68 1 YEAR WARRANTY 330uF 25V .09 6 POS. .77 RED 5mm .06 2N5400 .12 470uF 25V .09 8 POS. .80 GREEN 3mm .07 519.00 each 1 AMP SCHHOTTKY 2N5550 .12 1000uF 25V .22 10 POS. 95 GREEN 5mm .07 1N5817 .20 2N5551 .09 FAX/MODEM BOARD 2200uF 25V .42 r Alb YELLOW 3mm .08 1N5818 .23 MiE3055T .65 3300uF 25V .53 TOGGLE SWITCHES YELLOW 5mm .08 1 YEAR WARRANTY 1N5819 .25 MPSA-05 .10 4700uF 25V .91 WINDOWS SOFTWARE MPSA-10 .12 SPDT .62 BUNKER LED INCLUDED RADIAL MONOLYT1C 3 AMP SO4OTTKY MPSA-13 .15 SPDT center off .73 RED 5mm .65 1N5820 .40 MPSA-14 .15 $69.00 each CAPACITORS DPDT .69 1N5821 .46 MPSA-42 .14 DPDT center off .86 3 BUTTON MOUSE 1N5822 .50 MPSA-04 .22 LED HOLDERS DRIVERS SOFTWARE MPSA-56 .10 PUSH BUTTON 3mm .08 .001uF 50V 05 INCWEE D GERNMNIUM MPSA-63 .45 SWITCHES 5mm .08 .0022uF 50V .05 $1030 each 1N34A .10 MPSA-92 .10 CABLE 0047uF 50V .05 4414 TIES 1N60 .10 MPSA-93 .15 fits In a 1/4' hole OluF 50V .05 NATURAL °COLOR MOTHER BOARDS 1N270 .17 MPSH-10 .10 Normally open .29 022uF 50V .05 386 CPU PN2222A .05 Normally closed .30 4" 100pcs 2.00 DX-40 OK 138.00 .047uF 50V .05 PN2907A .05 SWITCHING 8 100pcs 4.00 DX-40 128K 150.00 luF 50V .05 11P31 .42 BRIDGE RECTIFIER 1N914 .025 11' 100pcs 6.00 .22uF 50V .12 11P41 .48 1N4148 .025 14" 100pcs 8.00 47uF 50V .17 TIP122 .52 N UNE BODY 4116 CPU 1 W DIODE WI9R T1P125 .55 RS101 1A -50V .60 SX-25 OK 233.00 CERAMIC DISC 1N4728 3.3V .07 R5106 1A -800V .93 CABLE TE MOUNT DX-33 128K 487.00 CAPACITORS 1N4729 3.6V .07 VOLTAGE REGULATORS 3N256 2A-400V .95 self stick 100pcs 10.00 DX-00 256K 546.00 1F4730 3.9V .07 DX-50 728 00 11400 4A -50V .65 RESISTORS 1N4731 4.3V .07 7805 .48 1U600 6A -50V 1.02 1N4732 4.7V .07 1 /4W SIC 1Lb SOLDER ROLL 10pF 50V .05 7812 .48 TU800 8A -50V 1.33 1N4733 5.1V .07 ANY STANDARD VALUE .031' daneter 22pF 50V .05 7905 .48 1N4734 5.6V .07 SN60/40 27pF 50V .05 7912 .48 11 PIN DP BODY sold in increments of 1N4735 6.2V .07 each 33pF 50V .05 781.05 .35 DF005M 1A-50V .25 50pcs per value. $6.50 U. 1N4736 6.8V .07 78112 .35 47pF 50V .05 I)F10M 1A-1KV .52 50pcs bag 1N4737 7.5V .07 $0.80 7 SEGMENT DISPLAY 680 50V .05 79105 .35 1N4738 8.2V .07 82pF 50V .05 LM317T .68 ROUND BODY HEAT SNP 14mm RED 1144739 9.1V .07 100pF 50V .05 LM350T 2.05 WO4M 14 -400V .35 FOR 70 -220 COMMON ANODE 1N4740 10V .07 120pF 50V .05 2W1OM 2A -1KV .50 SIZE 50.49 each 1N4741 11V .07 INTEGRATED CIRCUITS 150pF 50V .05 1N4742 12V .07 6/8' x 6/8" x 3/8' 180pF 50V .05 SQUARE WRELEADS AXIAL ELECTROLYTIC 1N4743 13V .07 CD4001 .29 $0.25 oath 220pF 50V .05 TB305 3A -50V .53 CAPACITORS 1N4744 15V .07 CD4011 .29 270pF 50V .05 lß805 8A -50V .93 D-SUB CONNECTORS 1144745 16V .07 CD4013 .37 330pF 50V .05 1N4746 18V .07 CD4017 .37 SOLDER CUP 470pF 50V .05 SQUARE TAB LEADS 10uF 25V 10 1N4747 20V .07 CD4028 .37 DB9 male .29 1000pF 50V .05 TB151 15A -100V 2.30 1N4748 CD4049 .29 DB9 fern. 29 22uF 25V .14 22V .07 113352 2200pF 50V .05 35A -200V 2.68 47uF .16 1N4749 24V .07 CD4051 .63 DB25 male .53 25V 3300pF 50V .05 144750 27V .07 CD4066 .35 CRYSTALS £825 fern. .53 100uF 25V .19 4700pF 50V .05 1N4751 30V .07 CD4069 .29 I-1C18 case 220uF 25V .27 .01uF 50V .05 470uF 25V .35 1N4752 33V .07 LM311 .43 1.8432 MHZ .89 RIGHT ANGLE PC .022uF 50V .05 .45 1N4753 36V .07 LM324 .47 2.0000 MHZ .74 DB -9 male .39 1000uF 25V .047uF 50V .05 2200uF 25V 89 1N4754 39V .07 LM339 .47 3.5795 MHZ .74 DB -9 fern. .39 .luF 50V .05 1144755 43V .07 LM358 .47 3.6864 MHZ .74 DB -25 male .69 1N4756 47V .07 1M386 .67 4.0000 MHZ .74 DB -25 fem. .69 DIPPED TANTALUM 1N4757 51V .07 LM393 .37 4.9152 MHZ .74 CAPACITORS THERE ISN'T A 1144758 56V .07 LM555 .43 5.0688 MHZ .74 PLASTIC HOOD LM556 47 7.3728 MHZ .74 BETTER 1N4759 62V .07 FOR DB SOURCE .37 10.000 MHZ .74 1N4760 68V .07 LM741 DB-09 .26 FOR luF 25V .14 .43 11.000 MHZ .74 1N4761 75V .07 MC1458 D8-15 .27 2.2uF 25V .14 LM1488 .47 11.059 MHZ .74 BASIC 1N4762 82V .07 DB-25 .29 10uF 25V .25 .47 12.000 MI-1Z .74 1N4763 91V .07 LM1489 DB-37 .53 COMPONENTS. 22uF 25V .52 1N4764 100V .07 111111 .35 14.3181 MHZ .74

MAIL YOUR ORDERS TO TERMS AND CONDITIONS ORDER, Please odd $2.00 handing to orders 800 998 -2242 ACCORD ELECTRONIC SYSTEMS NO MINIMUM less than $10.00. We take VISA, Master Card, Checks, Money PH: (305) 968 -1026 2946 N.W. 60tú STREET Orders and COD Odd $4.50 to COD orders) - Shipping and handing is $4.00 on dl regular shipping. For next day or two FAX: (305) 968 -1027 FORT LAUDERDALE, FL 33309 days service and foreign orders, please call for shipping CALL TO GET FLYER. Attn.: ORDER DESK amount. Florida residents don't forget to add 6% sales tax. OUR MONTHLY 176 We can also open an account for your company. CIRCLE 211 ON FREE INFORMATION CARD

www.americanradiohistory.com 7HE BASIC STAMP'' 39 Stamp -Sized Computer Runs BASIC NO//IT/O The BASIC Stamp is a 1x2 -inch computer that runs BASIC programs written on your PC. It has 8 I/O lines, which can easily he programmed for serial communications, potentiometer input, pulse measurement, button dehounce, tone generation, PWM, etc. And all by just adding a resistor and /or capacitor, if anything. Single Stamps sell for $39, and quantity prices start at just four units.

232 OUT Writing programs for the Stamp is easy. A 3 -pin cable connects the Stamp to your PC's parallel port. And o THERMISTOR Z000000 one piece of software is used to enter,

6 00000 debug, and download your programs. 1 It's as simple as possible. emperature Sensor All that you need to program Stamps is in the Stamp Programming t this application, the Stamp included ses a capacitor and Radio Shack Package. The package contains the lermistor to take temperature cable and software mentioned above, !adings. 13 BASIC instructions e used to read and linearize the as well as a manual, application iput. The result is then sent out notes, and free technical support. 'rially. Please note: Stamps are not included. Stamp Programming Package $99

'IC®16Cxx MICROCONTROLLERS and TOOLS Inexpensive and available, PICs are building a following

'u may already know about the PIC16CxX series of 8 -bit microcontrollers from 4icrochip Technology. They're the answer to many small controller needs, specially if price if an issue. A typical PIC is the PIC16C54 -RC /P; it's an 18 -pin DIP lackage with 12 I/O lines, 512 words of PROM, and 32 bytes of RAM, all for round $4.00 in small quantities. And the series continues to grow: new PICs have lterrupts, A/D, and up to 33 I/O lines. or the past three years, we've been helping people get started with PICs. We offer 3w -cost development tools, documentation, application notes, and technical help, PIC Chips $4 - $27 s well as the PICs themselves. We offer PICs in the "RC" and EPROM versions.

'IC16Cxx Programmer $199 PIC16C5x Downloader $299 TrueFlight "' for '71/'84 $299 PIC Prototype Board $15 upports PIC16C5x, '71, & '84. Plugs in place of '5x PIC in- circuit. Programmer & flash I eraser form Provides an easy way to develop PICs. iso PIC16C64 with 40 -pin adapter. Runs code at 8 MHz. development system I 1 & '84. circuits with 18- and 28 -pin

USA 3805 Atherton Road, #102 Rocklin, CA 95765 VISA ñ (916) 624 -8333 Fax: 624 -8003 BBS: 624 -7101 iR tiTM i subject to change without notice. ASIC Stamp. TrueFlight, and the Parallax logo are trademarks of Parallax. ire.. PIC is a registered trademark of \licnxhip Technology, Ion ,..(lures and prices www.americanradiohistory.com GaAs SWITCHES DC 2GHz Immediate Deliver y from

Finally! A line of SPDT absorptive, reflective and transfer switches that appeals to your technical side, and business side as well! Its Mini -Circuits GaAs switches...providing outstanding performance features such as very high isolation (up to 60dB), superfast 3nsec switching speed and excellent compatibility with surface mount soldering techniques. Additionally, the entire series is built extremely tough and is immediately available from stock with a

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Insertion 1dB In -Out Price Sea. No. (G)Hz(gdm( dB max.) Byp) dB (typ.) (q0 ) MSW -2 -20 DC -2.0 1.0 +24 34 2.95 (Reflective) MSWA -2 -20 DC -2.0 1.3 +27 40 3.45 (Absorptive) MSWT -4 -20 DC -2.0 1.8 TX O +28 TX ® 30 3.95 (Transfer) 2.0 RX 2 +27 RX O Midband, 500- 1000MHz ® Transmit ® Receive At Units: SOIL 8pin Package _o Actual Size o- - L-o SPDT REFLECTIVE

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Mini- Circuits ® P.O Box 350166, Brooklyn, New York 11235 -0003 (718) 934 -4500 Fax (718)332 -4661 For detailed specs on all Mini -Circuits products refer to THOMAS REGISTER Vol. 23 MICROWAVES PRODUCTS DIRECTORY EEM MINI -CIRCUITS' 740 - pg. HANDBOOK. CUSTOM PRODUCT N EEDS ... Let Our Experience Work For You. F 174 Rev ON CIRCLE 179 ON FREE INFORMATION CARD www.americanradiohistory.com