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Popular Electronics Build a Super -Simple Laser Power Supply 48784 Popular Electronics Make a Mac The Electronic Get a better, more expandable machine, Dragonfly and save some cash in the bargain, when Turn pieces of piezo- you build your own Macintosh computer electric film into a fun - to- build, fun -to -use conversation piece All About Receiver Sensitivity Find out what those receiver- sensitivity specs really mean GERNSBACK PUBLICATIC^. rocct Reviews Build the Socket Sentinel onyjo a e A surge -protected, "smart" power strip system, Pulsar that let's you use one device to control 72 -inch up to three others projection TV, and much more What Do Electrical Engineers Do? Is a career as an electrical engineer right for you? After you read this article, you may be better able to answer that question t -L=-s:: . v r-r r C-gn ^ri _i : .t :. .Ç é-~nifrti:i:1_ -n'z ___ `. _ . _''11_ . __ 09 ;.!_:.!'::.. :, ._ [ r, , }:a 3 NEW .__Pi t?+¡'i!i $2.95 U.S. FactCards Jf7 T.ift' i:..fi $3.75 CANADA IN THIS ISSUE IL i o 09128 4878 7 www.americanradiohistory.comAmericanRadioHistory.Com r 7 Electronics Paperback Books GREAT PAPERBACKS AT SPECIAL PRICES BP248 -TEST BP267 -HOW TO BP265 -MORE An Ie1rcAYeLCn to BP256 -INTRO TO EQUIPMENT CON- Test Equìn,ont USE OSCILLO- ADVANCED USES taue.n..o.r. and LOUDSPEAKERS Construction OWPr AND STRUCTION n°''"`°0"w om«i.0 SCOPES AND OF THE MULTI - ENCLOSURE $5.95. Details con- OTHER TEST EQUIP- METER $5.95. Use DESIGN $5.95. We struction of simple, in- MENT $6.95. Mas- these techniques to explore the variety of expensive, but ex- tering the oscilloscope test and analyze the enclosure and speaker tremely useful test is not really too difficult. performance of a vari- designs in use today so equipment. AF Gen. This book explains all ety of components. the reader can under- Test Bench Ampl, Au- the standard controls Also see how to build stand the principles in- dio Millivoltmeter, Tran- and functions. Other ad -ons to extend multi- volved. sistor Tester and six equipment is also de- meter capabilities. more. scribed. BP249 BP263 -A CON -'. BP260- CONCISE AConoW -MORE CISE INTRO TO INTRO TO OS /2 tnnoduceontoOS/2 ADVANCED TEST dBASE $6.95. The $5.95. If you are a mul- EQUIPMENT CON- dBASE series of pro- titasking PC user and STRUCTION grams are probably the want to get the most $6.95. Eleven more best known database out of your computer test equipment con- programs for micro- then you must learn its struction projects. OS./2 operating sys- They include a digital 0.)(±,} computers. This book ..6.. is designed to help you tem. This book shows 0512 voltmeter, capacitance get started working you just how to do that. meter, current tracer IIIMRMz.ll IIIY with them. quickly and easily and more. rl PCP102- INTRO- DIGITAL 'BP257-INTRO TO DUCING DIGITAL AU- oiaoeiAmro BP245- BP247 -MORE Protects AUDIO PROJECTS ADVANCED MIDI AMATEUR RADIO DIO $9.95. Covers $5.95. Practical cir- PROJECTS $5.95. $6.95. Amateur is a all kinds of digital re- cuits to build and ex- Circuits included are a nique and fascinating cording methods - periment with. In- MIDI indicator, THRU hobby. This book gives CD, DAT and Sam- cludes A/D converter, box, merge unit, code he newcomer a com- pling. Bridges the gap input amplifier, digital generator, pedal, pro- prehensive and easy to between the technician delay line, compander. grammer, channelizer, understand guide to and the enthusiast. echo effect and more. and analyzer. the subject. Principles and meth- ods are explained. I 1 PCP108 -COM- COMPUT- L 1 PCP107- DIGITAL BP251- PUTERS AND MUSIC LOGIC GATES AND ER HOBBYISTS $9.95. Explains the FLIP FLOPS HANDBOOK basics of computers $10.00. Thorough $8.95. A wrapup of ev- and music with no pre- treatment of gates and erything the computer vious knowledge of flip -flops for enthusi- hobbyist needs to computers needed. asts, student and tech- know in one easy to Covers types of music nicians. Only a basic use volume. Provides a software and explains knowledge of elec- range of useful refer- how to set up your own tronics is needed. ence material in a sin- computer music stu- gle source. dio. BP195-INTRODUCTION TO SATELLITE TV $9.95. A definitive introduction to BP239- GETTING THE MOST FROM YOUR MULTIMETER $5.95. Covers the subject written for the professional engineer, electronics enthusiast, Or others basics of analog and digital meters. Methods of component testing includes who want to know more before they buy. 8 x 10 in. transistors, thyristors, resistors, capacitors and other active and passive devices. FOR BEGINNERS $5.50. Power supplies, radio and BP190-ADVANCED ELECTRONIC SECURITY PROJECTS $5.95. Includes a BP97 -IC PROJECTS circuits, oscillators, timers, switches, and more. If you can use a soldering iron passive infra -red detector, a fiber -optic loop alarm, computer-based alarms and an audio you can build these devices. unusual form of ultrasonic intruder detector. BP37 -50 PROJECTS USING RELAYS, SCR'S a TRIACS $5.50. Build pri- BP235 -POWER SELECTOR GUIDE $10.00. Complete guide to semiconduc- ority indicators, light modulators, warning devices, light dimmers and more tor power devices. More than 1000 power handling devices are included. They are RADIO RADIO HOOKUPS Reprint of 1924 booklet presents radio tabulated in alpha-numeric sequency by technical specs. Includes power diodes, LI -100 $3.00. regenerative, neutrodyne, reflex & more. Thyristors, Triacs, Power Transistors and FET's. circuits of the era including BP234- TRANSISTOR SELECTOR GUIDE $10.00. Companion volume to BP42- SIMPLE LED CIRCUITS $5.50. A large selection of simple applications BP235. Book covers more than 1400 JEDEC. JIS, and brand -specific devices. Also for this simple electronic component. contains listing by case type, and electronic parameters. Includes Dadington Helps the reader transistors, high -voltage devices, high- current devices. high power devices. BP127-HOW TO DESIGN ELECTRONIC PROJECTS $5.75. to put projects together from standard circuit blocks with a minimum of trial and El BP99-MINI-MATRIX BOARD PROJECTS $5.50. Here are 20 useful circuits error. that can be built on a mini -matrix board that is just 24 holes by ten copper -foil strips. BP122 -AUDIO AMPLIFIER CONSTRUCTION $5.75. Construction details for preamps and power amplifiers up through a 100-watt DC- coupled FED amplifier. BP117- PRACTICAL ELECTRONIC BUILDING BLOCKS-Book 1 $5.75. Oscillators, Timers, Noise Generators, Rectifiers, Comparators, Triggers and more. I 1 BP92-CRYSTAL SET CONSTRUCTION $5.50. Everything you need to know about building crystal radio receivers. BP184 -INTRO TO 68000 ASSEMBLY LANGUAGE $6.95. The 68000 is a great new breed of microprocessor. Programming in assembly language increases BP45- PROJECTS IN OPTOELECTRONICS $5.50. Includes infra -red detec- the running speed of your programs. Here's what you need to know. tors, transmitters, modulated light transmission and photographic applications. BP185- ELECTRONIC SYN- BP179- ELECTRONIC CIRCUITS THESIZER CONSTRUCTION $5.95. FOR THE COMPUTER CONTROL OF CHECK OFF Use this book to learn how to build a ROBOTS $7.50. Data and circuits for reasonably low cost, yet worthwhile interfacing the computer to the robot's monophonic synthesizer and learn a lot motors and sensors. THE BOOKS YOU WANT about electronic music synthesis in the i process. SHIPPING CHARGES IN ELECTRONIC TECHNOLOGY TODAY INC. USA AND CANADA SORRY No orders accepted Number of books ordered I I P.O. Park, 11762 Box 240, Massapequa NY -0240 outside of USA & Canada $0.01 to $5.00 $1.50 $5.01 to $10.00 $2.50 Total price of merehandise $ Name $10.01 to 20.00 $3.50 Sales Tax (New York State Residents only) $ to 30.00 . $4.50 Address $20.01 Shipping (see chart) $ $30.01 to 40.00 $5.50 City State Zip All payments must $40.01 to 50.00 $6.50 Total Enclosed S be in U.S. funds P -991 $50.01 and above $8.00 J www.americanradiohistory.comAmericanRadioHistory.Com SEPTEMBER 1991, VOLUME 8, NO. 9 Popular ctroiiicS THE MAGAZINE FOR THE ELECTRONICS ACTIVIST! CONSTRUCTION ARTICLES BUILD A SIMPLE LASER POWER SUPPLY Gregory Gray 32 Learn about laser operation with this easy -to- build, low power, laser-tube power-supply circuit THE ELECTRONIC DRAGONFLY Marc Spiwak 55 Make your next project a most unusual one BUILD THE SOCKET SENTINEL Marc Spiwak and John Yacono 63 Control the power to all the components in your A/V or other system using one component's own on /off switch! FEATURE ARTICLES MAKE YOUR OWN MAC .. Elliot Kantor 26 You can build an easily expandable Macintosh with some built -in frills for less than what a new no- frills unit would cost WHAT DO ELECTRICAL ENGINEERS DO? Harry L. Trietley 35 Read this article and find out; maybe you'll also learn if an engineering career is for you INSIDE THE SONY MINI DISC Brian C. Fenton 39 Will Sony's new Mini Disc revolutionize the portable audio industry, or will it simply muddy the waters for years to come? ALL ABOUT RECEIVER SENSITIVITY Joseph J. Carr 61 Learn about the different ways that receiver sensitivity is measured and specified, and what each rating really means PRODUCT REVIEWS GIZMO 43 Including: Sony Portable Shortwave Receiving System, Design Acoustics Video Speakers, and much more HANDS -ON REPORT 66 OWI WAO ll Mobile Robot Kit PRODUCT TEST REPORT Len Feldman 68 Pulsar TVP 2000 "Prodigy" Projection TV Receiver COLUMNS THINK TANK John Yacono 18 Controlling power COMPUTER BITS Jeff Holtzman 70 The 386 revolution continues ANTIQUE RADIO Marc Ellis 72 The theremin: A first look inside CIRCUIT CIRCUS Charles D.
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