SPRING].965ElECTRONIC EDITION $125 ciiiiiériics :EXPERIMENTER'S H A N DBOOK How TO BUILD VHF, SWL, & HAM BAND RECEIVERS HI-FI SPEAKER SYSTEMS SCIENCE FAIR PROJECTS PHOTOELECTRIC ALARM TEST EQUIPMENT C -R9 AUTOMOTIVE `Jx ELECTRONIC PROJECTS IMPROVING TV RECEPTION MAKE YOUR OWN 0-5000 RPM TACH FROM SIMPLIFIED PLANS (see page 11) LAFAYETTE RADIO ELECTRONICS 1965 CATALOG FREE No. 650 FAYETTE Now - Over 500 Pages! Featuring Everything G No.BSO in Electronics for Home Industry Laboratory from the tl,P.11Men!Kr .0« aamo, crat "World's Hi-Fi & Electronics Center" See the Largest Selection in Our 44 -Year History: hi-fi equipment STEREO HI-FI . .. there's a complete selection of stereo at Lafayette. All famous brands plus Lafayette's own top -rated compo- It's all in the new, nents. All at Lafayette's low, low prices too. 1965 Lafayette Catalog. CITIZENS BAND ... Lafayette still leads the field in transceivers, Walkie- Card Talkie and accessories. And the price is always right at Lafayette. I Detach and Mail the complete decks-you'll TAPE RECORDERS . .. from portable recorders to for Your FREE Copy! find the right recorder at the right price at Lafayette. well as the smallest HAM GEAR . for receivers, transmitters, as or write- accessory, amateurs everywhere make Lafayette their headquarters for all their gear. Dept. EH Lafayette Radio Electronics, -5 Want More? There's Test Equipment, Radios, Tools, Books, TV and Radio P.O. Box 10, Syosset, L. I., N. Y. 11791 Tubes and Parts, Auto Accessories, Cabinets, Drafting Supplies, Intercoms. AND Marine Equipment, Cameras, Optical Goods, Musical Instruments, P.A. Equipment, TV Sets, and Much More. BUY ON TIME ... Use Lafayette's famous Easy -Pay Credit Plan-up to 24 Months to Pay. CIRCLE NO. 22 ON READER SERVICE CARD AT SEA ON LAND In the Air! Job Opportunities continue to increase for the Electronics Technician Electronics is a multi -billion dollar industry, growing rapidly, calling for well -trained technicians, offering many good -paying opportunities. DeVry TRAINING prepares you at home - or in its well-equipped training centers - for FILM Radio, Television, Communications, Missiles, Computers, Radar, Control Systems, etc. You also get the loan DeVry sends the type of materials you need for learning electronics at of a motion picture home. You build and keep (1) a modern 5 -inch oscilloscope and (2) a projector and 16 reels portable transistorized meter. Use these on the job or to make money as of film to help you you learn. You work 300 construction and test procedures with our ex- learn quickly, remem- clusive "Electro -Lab". Modern lessons (No. 3 above) with their handy ber more. foldout diagrams help to speed your progress. Let us put our more than 30 years of "know-how" behind you today to help you prepare for a lot of brighter, more prosperous tomorrows. Send coupon for 2 FREE booklets today. Accredited Member of National Home Study Council FREE! DeVRY TECHNICAL INSTITUTE Send For 2 4141 Belmont Ave., Chicago, III. 60641 Dept. EE11-1-V Please give me your two free booklets. "Pocket Guide to Booklets Today ! Real Earnings." and "Electronics in Space Travel"; also include details on how to prepare for a career in Elec- tronics. I am interested in the following opportunity fields EMPLOYMENT ucvR (check one or more): SERVICE Naeal Space & Missile Electronics Communications Earnings Television and Radio D Computers All DeVry graduates can receive Microwaves Broadcasting Radar D Industrial Electronics the help of our highly effective Automation Electronics D Electronic Control employment service without ad- ditional cost. Name Age PLEASE PRINT Address Apt DeVry Technical Institute City Zone State Check here if you are under 16 years of age Chicago Toronto Canadian residents: Write DeVry Tech of Canada. Ltd. 970 Lawrence Avenue West, Toronto 19, Ontario 4141 BelmontTAvenueAvenue 2093 Chicago, Illinois 606416J601 CIRCLE NO. 11 ON READER SERVICE CARD 1965 Spring Edition 1 hal/i018t,'eis qua/its 3 `is the BIG NEWS in TEST INSTRUMENT KITS ... and hallicrafters engineered quality means outstanding specifications and performance . plus simplified construction! NEW "Fail -Proof" soldering NEW assembly ease. Mechan- terminal strips simplify mak- ical parts are riveted to the ing of positive connections. chassis at the factory. CAPACITANCE DECADE RESISTOR DECADE Kit HD -2 Kit HD -1 Use to substitute known -value Ideal for experimental and precision resistors in a cir- service work requiring pre- cuit. Resistors are one -watt, cision capacitors. Sixteen 10%. Twenty-eight commer- commercial slide switches give total variability in cial slide switches give total variability in 1 -ohm 100 pf steps. Uses silve. mica capacitors and long steps. Range: 1 ohm to 10 megohms in seven lasting stable defilm capacitors. Range .0001 to 1.0 decades. Price $14.95 mfd in four decades. Price $14.95 R.F. GENERATOR Kit HG -1 Generates frequencies from 50 kc. CONDENSER TESTER Kit HC -1 to 55 Mc. in six steps. Calibrated Handy service bench instrument for harmonics in two steps from 55 unknown condenser and re- checking Mc. to 220 Mc. Low frequency sistor values under operating condi- range exceptionally stable. Accu- tions. Has precision tuning eye for racy 11/2% of the reading. R.F. easy operation. Four capacitance output .1 -volt. Bandswitch as- ranges: 10 mmf to 2,000 mfd. sembly pre -wired and calibrated. Three resistance ranges: 0.5 ohm Price $29.95 to 5 megohms. Price $29.95 VACUUM TUBE VOLT MILLIAMETER 5-INCH OSCILLOSCOPE Kit HO -1 Kit HM -1 A perfect scope for servicing color Has an exclusive built-in milli- TV sets. Has full 5 Mc. bandwidth. ameter circuit, available at the Tube is 5 UPI. One -volt peak-to -peak turn of a switch. Illuminated meter source attenuator permits voltage and separate front panel On -Off measurements over range of 10,000 switch. Has seven AC, DC voltage to 1. Retrace blanking amplifier pro- ranges, from 1.5 to 1500; seven vided. Phasing is continuously vari- ohmeter ranges, 0 to 1,000 meg- able from 0 to 140°. Has two axis ohms; and six milliameter ranges, (beam) modulation. Price $84.95 1.5 to 500. Price $29.95 BATTERY ELIMINATOR Kit HP -1 Reliable source of 6- or 12 -volt DC power for servic- ing car radios, including transistor and "hybrid." AC ripple less than .25%; exceptionally low. Voltage ranges 0-8 volts and 0-16 volts. Also use as battery charger. Has voltage and current panel meters. Price $49.95 at your Authorized Lovk d s a Kt P y 11 iiicrafte ji ths Headquarters! ha//icrafiers AilcurtezKito for FREE Catalog, write Dept. 5-A, 5th & Kostner Aves., Chicago 24, III. Export: International Div., Hallicrafters. Canada: Gould Sales Company, Montreal, P. Q. CIRCLE NO. 17 ON READER SERVICE CARD 2 ELECTRONIC EXPERIMENTER'S HANDBOOK 1965 ELECTRONIC EXPERIMENTER'S HANDBOOK SPRING EDITION PHILLIP T. HEFFFERNAN Publisher OLIVER P. FERRELL Editor JAMES A. ROTH Art Editor MARGARET MAGNA Associate Editor ANDRE DUZANT Technical Illustrator NINA CHIRKO Editorial Assistant 19ôá PATTI MORGAN Editorial Assistant ELECTRONIC LAWRENCE SPORN Advertising Sales Manager ARDYS C. MORAN Advertising Service Manager EXPERIMENTER'S ZIFF-DAVIS PUBLISHING COMPANY HANDBOOK Editorial and Executive Offices (212 ORegon 9-72001 One Pork Avenue, New York, New York 10016 William B. Ziff, Chairman of the Board (1946-19531 William Ziff, President W. Bradford Briggs. Executive Vice President Hershel B. Sarbin, Vice President and General Manager Philip Sine, Treasurer Walter S. Mills, Jr., Circulation Director Stanley R. Greenfield, Vice President Phillip T. Heffernan, Vice President New York Office (212 ORegon 9-7200) One Park Avenue, New York, New York 10016 Eastern Advertising Manager, RICHARD J. HALPERN Midwestern Office (312 WAbash 2-4911) 434 South Wabash Avenue, Chicago, Illinois 60605 Midwestern Advertising Manager, JAMES WEAKLEY Western Office (213 CRestview 4-0265) 9025 Wilshire Boulevard, Beverly Hills, California 90211 Western Advertising Manager, BUD DEAN MPA THIS is the Ninth Annual Edition of the ELECTRONIC EXPERIMENTER'S HANDBOOK. If you looked closely at the cover, you will have noted that we said "Spring Edition." Yes, in response to hundreds of requests, the EXPERIMENTER'S HAND- BOOK will be issued twice in 1965-the usual Spring Edition, and a brand-new "Fall Edition." We are also pleased to announce that projects will appear in both editions that are new and not reprints from POPULAR ELECTRONICS. As in the past, your Editors have taken great pains to double-check all circuit dia- grams and parts listings. We believe them to be as correct as possible at time of printing. We hope you enjoy the projects described herein and that you will look forward to the Fall Edition. THE EDITORS 1965 ELECTRONIC EXPERIMENTER'S HANDBOOK, Spring Edition, published by the Ziff -Davis Publishing Company, One Park Avenue, New York, New York 10016. Also publishers of Popular Electronics, Electronics World, HiFi/Stereo Review, Communications Handbook, Tape Recorder Annual, Stereo/Hi-Fi Directory. Copyright © 1965 by Ziff -Davis Publishing Compony. All rights reserved. 1965 Spring Edition 3 Nation's most popular, most Viking Amateur Equipment opens "Messenger" Industrial Radio complete Citizens Band line! the door to world-wide adventure! for a fully integrated system! Everything you ever wanted for Excellent value, solid performance, Priced within easy reach of any CB - from compact, hand-held and an unmatched reputation for business, here's the line that "Personal Messengers" to the reliability-that's why novice and offers everything from hand-held tiny, new all transistor "Messenger experienced amateurs check units and portable field pack to a Ill"! Information -packed, full - Johnson first! Complete, 20 -page choice of base station and mobile color 8 -page brochure gives you amateur catalog gives you all the equipment for use in 25 to 50 all the details-see your distribu- dope on these world famous trans- megacycle range! Complete de- tor or use the coupon below.