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  • BUILD $6 AUTO TACHOMETER

    POPULAR ELECTRONICS

    50 CENTS

    Experiments in Biological Radio - Now To Choose Your Color Bar Generator - Simplified Sound Sync-Build

    . Incredible VF- Electric Tic -Tac -Toe - CB Tuneups

    .

    TRAC

    AUDIO PI

    Build

    Signal Tracer tlsin

    FET Circuit (see page 43;

    5F

    t luimigiamia C < www.americanradiohistory.comAmericanRadioHistory.Com

    www.americanradiohistory.com

  • Learning electronics at home is faster, easier, more interesting with new achievement kit

    GET A FASTER START IN THE COURSE YOU CHOOSE WITH NRI'S REMARKABLE ACHIEVEMENT KIT When you enroll with NRI we deliver to your door everything you need to make a significant start in the Electronics field of your choice. This re- markable, new starter kit is worth many times the small down payment required to start your training. And it is only the start ... only the first example of NRI's unique ability to apply 50 years of home -study experience to the challenges of this Electronics Age. Start your training this exciting, rewarding way. No other school has any- thing like it. What do you get? The NRI Achieve- ment Kit includes: your first set of easy- to -un- derstand "bite- size" texts; a rich, vinyl desk folder to hold your training material in orderly fashion; the valuable NRI Radio -TV Electronics Dictionary; important reference texts; classroom tools like pencils, a ball -point pen, an engineer's ruler; special printed sheets for your lesson an- swers -even a supply of pre- addressed envelopes and your first postage stamp.

    Only NRI offers you this pioneering method of "3 Dimensional" home -study training in Elec- tronics, TV- Radio... a remarkable teaching idea unlike anything you have ever encountered. Founded more than half a century ago -in the days of wireless- NRI pioneered the "learn -by- doing" method of home -study. Today, NRI is the oldest, largest home -study Electronics school. The NRI staff of more than 150 dedicated people has made course material entertaining and easy to grasp. NRI has simplified, organized and dramatized subject matter so that any ambitious man - regardless of his education -can effec- tively learn the Electronics course of his choice.

    DISCOVER THE EXCITEMENT OF NRI TRAINING

    Whatever your reason for wanting knowledge of Electronics, you'll find the NRI "3 Dimensional" method makes learning exciting, fast. You build, test, experiment, explore. Investigate NRI train- ing plans, find out about the NRI Achievement Kit. Fill in and mail the postage -free card. No salesman will call. NATIONAL RADIO INSTITUTE, Electronics Division, Washington, D. C. 20016

    www.americanradiohistory.comAmericanRadioHistory.Com

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  • ELECTRONICS COMES ALIVE AS YOU LEARN BY DOING WITH CUSTOM TRAINING EQUIPMENT Nothing is as effective as learning by doing. That's why NRI puts so much emphasis on equipment, and why NRI invites comparison with equipment offered by any other school, at any price. NRI pioneered and perfected the use of special training kits to aid learning at home. You get your hands on actual parts like resistors, capacitors, tubes, condensers, wire, transistors and diodes. You build, experiment, explore, dis- cover. You start right out building your own pro- fessional vacuum tube voltmeter with which you learn to measure voltage and current. You learn how to mount and solder parts, how to read sche- matic diagrams. Then, you progress to other ex- perimental equipment until you ultimately build a TV set, an actual transmitter or a functioning computer unit (depending on the course you se- lect). It's the practical, easy way to learn at home -the priceless "third dimension" in NRI's exclusive Electronic TV -Radio training method.

    SIMPLIFIED, WELL -ILLUSTRATED "BITE -SIZE" LESSON TEXTS PROGRAM YOUR TRAINING

    Lesson texts are a necessary part of training, but only a part. NRI's "bite- size" texts are as simpli- fied, direct and well -illustrated as half a century of teaching experience can make them. The amount of material in each text, the length and design, is precisely right for home -study. NRI texts are programmed with NRI training kits to make things you read come alive. As you learn, you'll experience all the excitement of original) discovery. Texts and equipment vary wish the course. Choose from major training programs it TV -Radio Servicing, Industrial Electronics and Complete Communications. Or select one of seven spe- cial courses to meet spe- cific needs. Check the courses of most interest to you on the postage -free card and mail it today for your free catalog.

    Available Under

    NEW GI BILL

    If you served since January 31, 1955, or are in service, check GI line in postage -free card.

    custom training kits "bite - size "texts

    April, 1967 3

    www.americanradiohistory.comAmericanRadioHistory.Com

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  • POPULAR ELECTRONICS WORLD'S LARGEST -SELLING ELECTRONICS MAGAZINE

    VOLUME 26 APRIL, 1967

    SPECIAL CONSTRUCTION FEATURE JAMES RANDALL 43 MULTIPURPOSE FET SIGNAL TRACER

    Doubles as a millivoltmeter a winning combination

    NUMBER 4

    FEATURE ARTICLES HENRY R. ROSENBLATT 23 'CAPSNAPPER" ARRESTS SHOCK HAZARD

    ROBERT CORNELL 48 WHAT YOU SHOULD KNOW ABOUT TV COLOR BAR GENERATORS Guide to features, functions, and things

    53 BIOLOGICAL RADIO -ESP New experiments may unravel mystery of ESP

    59 SOUND SYNC'ER Stops motion on film with a bang

    61 56 ELECTRONIC TACHOMETER Takes the guesswork out of gear shifts

    ROBERT P. BALIN 63 GRAPH INTERPRETATION QUIZ JOSEPH ZELLE 68 HEO6bI'IHAR TEJlEBN31,10HHAA AHTEHHA

    R. L. WINKLEPLECK, WA9IGU 69 THE INCREDIBLE VFO You won't believe it till you see itl

    DANIEL MEYER, KMT2967 72 GETTING THE MOST FROM YOUR CB RIG Tune -up for maximum modulation not r.t. output

    KEN GREENBERG 74 ELECTRIC TIC TAC TOE Colorful game makes good Science Fair project

    CHARLES J. SCHAUERS, W6QLV 76 INFORMATION CENTRAL More questions answered on everything and anything

    HERB S. BRIER, W9EGQ 79 AMATEUR RADIO World peace and amateur rodio

    MATT P. SPINELLO, KHC2060 81 ON THE CITIZENS BAND ALEX F. BURR, KKI1395 82 CB EN ROUTE -IS IT WORTHWHILE?

    LOU GARNER 83 SOLID STATE ROBERT LEGGE 86 ENGLISH- LANGUAGE BROADCASTS TO NORTH AMERICA

    HANK BENNETT, W2PNA 87 SHORT -WAVE LISTENING Spring catch North Sea hospital ship

    88 ANNOUNCING: UNUSUALLY ADAPTABLE COMPUTER WALT MILLER 94 THE HOBBYIST

    116 DX PROVINCES AWARDS PRESENTED

    DAN HALACY

    A. J. LOWE

    RICHARD E. STAERZL

    DEPARTMENTS

    How to take crash -action photos 59

    8 14 15 16 24 28 34 36

    LETTERS FROM OUR READERS OUT OF TUNE READER SERVICE PAGE TIPS & TECHNIQUES NEW PRODUCTS OPERATION ASSIST ELECTRONICS LIBRARY NEW LITERATURE

    U u U

    At what wavelength is ESP? 53

    POPULAR ELECTRONICS Is Indexed in the Readers' Guide to Periodical Literature

    Thls moConth's Cover photo by nrad Stadio,, Inc.

    Copyright 1967 by ZIFF.DAVIS PUBLISHING COMPANY. All rights reserved. POPULAR ELECTRONICS, April 1967, Volume 26, 3'umbr r 4. Puliahrrl aranthly at 307 North Michigan Avenue, Chicago, Illinois 60601. One year sub.rrr iption rate for U.S., U.S. Possessions and Canada, $5.00; all other countries, $6.00. Second class postage paid at Chicago, Illinois and at additional mailing offices. .authorized as second class mail by the l'est Office Department, Ottawa, Canada and for payment of postage to cosh. Subscription Service: Portland Place, Boulder, Colorado 80901.

    www.americanradiohistory.comAmericanRadioHistory.Com

    www.americanradiohistory.com

  • DEVRY TECH NOT ONLY

    TRAINS

    DEW ... BUT HELPS YOU

    GET

    STARTED AT NO EXTRA

    COST IN

    THE .d+ ,4ONEY FIELI OF

    HOME LABORATORY EaUIPMENT

    - YOURS TO KEEP!

    oAcirnomal VPREPARE AT HOME

    Whether you want to prepare for a good -paying new job or for advancement in Electronics with your present employer, DeVry Tech offers specialized educational programs designed to meet your needs. You set up your own HOME LABORATORY and work over 300 construction and test procedures to develop on- the -job type skills. You build a quality Transistorized Meter, a 5 -inch Oscilloscope and a special Design Console. DeVry also includes modern "programmed" texts, instructive motion pic- tures, Consultation Service. Effective? Yes!

    VRESIDENT SCHOOL If you prefer you may get all of your training in DeVry's

    U.S. or Canadian resident schools under the close guidance of friendly, experienced instructors. You work with a wide variety of commercial equipment similar to that actually used in in- dustry as you prepare in our laboratories for a technician's job in Communications, Microwaves, Radio -Television, Automation, Radar, Computers, or other branch of Electronics. DeVry even provides part-time job placement service to those who wish to earn extra money while attending day or evening classes.

    VPLACEMENT SERVICE Meet W. E. Bartz, who has helped thousands of DeVry

    men toward exciting, profitable careers in Electronics. When YOU complete your program, he will help you too. As Placement Manager iin touch with business and industry across the nation, Bartz knows the employer demand for DeVry- trained men. He has cooperated in placing our graduates with thousands of firms!

    Men 18 -45. start preparing NOW for this vast opportunity field. Soon you should be ready for DeVry's valuable employment help!

    .,

    o Advanced Education or Previous Technical

    . -Experience Needed to Get Started

    Your ambition and desire to suc- ceed are mcre important! DeVry guides ycu every step of

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