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1. Model FO 30K e Menu Driven ing Triple Display course 1 95 RS 232 Interface j True RMS 9 Basic Functions including cap amp freq Auto Power Off e Easy to use Model AM FM 108K La sein T Kit M 1005K Compact Multimeter with training course Kit 4Q 95 i 529 95 19 125 E 6 Functions amp Transistor L Test WE WILL NOT BE UNDERSOLD C amp S SALES INC 15 DAY MONEY BACK 150 W CARPENTER AVENUE GUARANTEE UPS SHIPPING 48 STATES 5 WHEELING IL 60090 FULL FACTORY WARRANTY OTHERS CALL FOR DETAILS FAX 847 520 9904 847 541 0710 iL Residents add 8 Sales Tax http www elenco com cs_sales PRICES SUBJECT TO CHANGE WITHOUT NOTICE CIRCLE 32 ON FREE INFORMATION CARD FREE PROBES WITH ALL SCOPES B amp K Precision Scopes 60MHz ANALOG WITH DIGITAL STORAGE Model 2560 Rszaz pon onn lt 20MS s real lime samping I1GHz equivalent time sampling at 0 1pe div ee Printa via AS 232 port 3 to any 1 99 ieee 20MHz ANALOG WITH DIGITAL STORAGE Modei 2522A 20MHz analog bandwidth 20MS s sampling rate 2K memory pet channel izre 300MH2 equivalent time sampling Pre trigger capture 100MHz THREE TRACE Modei 2190 ImV division sensitivity Sweeps lo 5ns division base Signal delay tine Dual time ISKV accelerating voltage 1379 95 60MHz DUAL TRACE Model 2160A 1mVidivision
2. MX 9300 Four Functions in One One Instrument with four test and measuring systems 1 3GHz Frequency Counter 2MHz Sweep Function Generator GF 8026 w Frequency e Linear and Log Sweep Digital Multimeter Digital Triple Power Supply 4 DC volages 3 fixed 5V 3A I 1A 12V 1A 02Hz to 2MHz i i 0 30V 3A 15V 1A 5V 2A 1 Variable 2 5 20V 2A e Counter Range ea 1Hz to 10MHz ieee gg i 4 Digit Dispiay ree 479 9 225 Auto Ranging Hand Held Fluke Multimeters Digital Multimeter DMM w Bar Graph Model M 1700 70 Serles 80 Serles Model 70ll 69 95 Model 83 235 00 Model EDM 163 Model 73lI 97 50 Model 85 269 00 Model 75II 135 00 Model 87 289 00 Model 77Il 154 95 Model 79ll 175 00 B amp K Precision Multimeters 39 999 11 functions including freq to 20MHz Model 391 _ 159 00 Model 388A 99 00 ge Epes witii Gate told cap to 20uF Meets UL 1244 safety 4 Model 390 139 00 Model 2707 79 00 Compares to Fluke Model 771l specs Model 389 109 00 Model 28604 85 00 Kit Corner e Model M 6100 over 100 kits available Programmable DMM PT 223K 4 Fiber Optics a Includes FREE Computer Interface 4595 Technology and FREE Software Analog Bar Graph Phone kit with tralning course e Large 3 3 4 LCD Display
3. Expiration Date _ S Signature a Name Phone 104 Address City State Zip Earn up to 45 an hour or more as a skilled Computer Programmer Cash in on the explosion of opportunities Start your new career or even open a business of your own as a highly paid computer programmer A Get the free facts today own ticket to financial well being and job satisfaction Whether you want to change careers have a profitable Only Foley Belsaw s unique in home training programs can part time job or start your own business Foley Belsaw omputer programmers today can almost write their Institute s new computer programming course is the first step give you the skills you need at a price you can afford A profitable future in computer programming can be yours You ll learn the three hot computer languages QBasic Cand Visual Basic You ll even work with the hornen C Call or write today for a fact filled information kit including a With this easy to learn knowledge you ll write your first free copy of Computer Progr amming A P rofitable Career In QBasic program by the end of the first SkillPak of lessons Your Spare Time See how easy it is to begin a money making Soon you ll be programming sound and graphics and even career as a sought after computer programmer Our free full learning how to program for the Windows environment color information kit outlines the steps of th
4. SUPER SNOOPER BIG EAR Listen through walls hear conversations across the room Add a parabolic reflec This Manual contains schematics parts lists amp P C board layouts for many of the Rainbow Kits Use your own parts to construct our kits tor and hear blocks away The BIG EAR can be hidden about KIT BOOK 14 95 anywhere Makes an ultra sensitive intercom Can ing calls The MMPT2 is undetectable if properl ni installed Unit has surface mounted pare sel 9 95 with the purchase ee eg oe Suet a ee install the leaded parts Size 45 x 6 or amaki mike in the kit Power requirement 6 to12v DC ee 90995 ae SIZE 1 75 x 1 kit 29 95 a AA 1 BUILT 29 95 KIT 10 95 MICRO MINIATURE rr aT I a an a E WIRELESS MIKE INDUCTANCE METER RELAY POWER KIT This is the kit everyone has been asking for Turn your digital volt ohm meter into an inductance meter It will read inductors 3uH to 7MH Power requirement 9v DC SIZE 1 75 x 2 5 So small you could hide this one on some real bugs It s the small ast we ve aver seen With it s super Sensitive mike it transmits a whisper or a room of conversa kit from 100mA to 3 Amps If you need to switch more power up to 300 Watts tion to an FM radio tunable from 88 to 108MHz FM Te Kit 14 95 with the Light Genie With a proper antenna it transmits about 1 2 mile The estes 8 95 Temperature Genie Timer or Vox kits use kit i
5. I 2 wo wn Sax e Lots more High Standard Test Instruments available Goodbye tax forms Hello TeleFile This year millions will file their tax returns by phone using TeleFile a free service from the IRS The call is easy and refunds are fast Check your mail for a TeleFile book et u TeleFile It s free It s fast It works i Department of the Treasury Internal Revenue Service http www irs ustreas gov NEW PIC microcontroller amp Surveillance KITS Ultra small wireless FM mic Phone transmitter SLeach PIC kits include security contro and hobby applications Most kits use Surface Mount Technology SMT SMT kits include our exclusive surface mount soldering guide Kits are designed and manufactured by IEC Pager Decoder interface kit for PC Only 19 s amp H PD shareware software included Order 1 800 417 6689 Mon Fri 9AM 5PM ET Visa MC Money Orders For a catalog send SASE to March 1997 Popular Electronics mh RO All in One Instrument Oscilloscope Power Supply Function Generator Frequency Counter Multimeter Capacitance Engine Analyzer Clamp On Electrical Tester and More _ See your local distributors or Call for Catalog 1 800 532 3221 Bel MERIT 714 TORRA 4 586 3399 SOLUTIONS FOR THE TEST INSTRUMENT P O Box 744 Lake Forest CA 92630 IEC P O Box 52847 Knoxville TN 37950 2347 Sorry no refu
6. Popular Electronics Turn to this comprehensive circuit library for hundreds of project ideas and concise pinout diagrams and schematics In each volume you ll find more than 700 electronic and integrated circuits and 100 circuit categories right at your z i 4088 total pages 3 fingertips to give you ideas you can use on the job 4 490 total illustrations _ or at your workbench As a member ofthe Electronics Engineers Book Club yov il enjoy re ceiving Club bulletins every 3 4 weeks containing exciting offers on the latest books in the field at savings of up to 50 off the regular publishers prices if you want the Main selection do nothing and it will be shipped aute matically If you want another book or no book at all simply return the reply form to us by the date specified You ll have at least 10 days to decide If you ever receive a book you don t want due to late delivery of the bulletin you can return it at our expense And you ll be eligible for FREE BOOKS through the Bonus Book Plan Your only obligation is to purchase 3 more books during the next 2 years after which you may cancel your membership at any time Publishers price shown 1996 EEBC if coupon is missing write to Electronics Engineers Book Club A Division of The McGraw Hill Companies P O Box 549 Blacklick OH 43004 9918 om A D
7. ALL OR WRITE FOR A FREE 60 PAGE Lowest Prices of the Year s A Quality Scopes by Elenco ere seee t Taen e g je n n ae LITTIN T pensonnncrarconaell AOMHz 25 30MHz S 1345 569 DS 303 1095 e Analog with Delayed Sweep Analog Digital Storage 1340 475 S 1330 439 Analog 25MHz Analog e Delayed Sweep S 1325 325 e 25MHz Analog acme Sas eos z 60MHz 1350 749 2 Year Warranty SCILLOSCOPE SELECTION CHART ANALOG Component tester Model Sweep Rate Delayed Video Component Beam Time Max ns div Sweep Sync Tester Find Base 10ns div Yes Yes Yes Yes 2 10ns div Yes Yes Yes Yes 10ns div No Yes No No 10ns div Yes Yes Yes Yes 10ns div No Yes No No Sensitivity No of Channels Bandwidth MHz max ImV div ImV div 1mV div 1mV div ImVidiv Analog No of Sampling Memory _ Internall Channels Rate Channel Backed Up 20MS S 2k Yes 20MS S 2K Yes Bandwidth MHz Sen max imVidiv 2 imvidiv 2 Pretrigger Output 0 25 50 75 RS232 0 25 50 75 RS232 AT PRICES THIS LOW THEY LL BE GONE HITACHI SCOPES KON Inventory Reduction Sale Lowest Prices of the Decade V 209 20MHz Battery Operated V 695 60MHz w Cursors Was 31505 NOW 1095 Save 410 Was 1815 NOW 1395 Save 420 V 1065A 100MHz w Cursors Was 2139 NOW 1565 Save 574 V 42 4 OMHz Was 965 NOW 765 Save 200 V 525 10MHz w Cursors V 1560 100MHz Was 1790 Was 1355 NOW 955 Sav
8. ircuitMaker s schematic capabilities are unmatched and include many advanced diting features not found in similar programs These powerful features minimize he time and task associated with drawing a schematic and insure a professional ooking final product Printout and export options are numerous and results are of he highest quality But that s what people have come to expect from CircuitMaker Unlimited Indestructible Devices ircuitMaker ships with over 1500 devices That s more at no additional cost han any competing product If you need a device that is not included CircuitMaker wovides industry standard SPICE import and a powerful macro capability These ndestructible devices accurately emulate actual devices and enable the user to try ill those what if scenarios with no risk and at no additional cost Accurate Simulation amp Advanced Analysis ircuitMaker features analog digital and mixed mode simulation Obviously simu ation is of no value if the results are not accurate CircuitMaker s simulation en sine is based on Berkeley SPICE3 which is renowned for it s accuracy That s vhy we can factually state that CircuitMaker provides it s user with the most accu ate Simulation available Furthermore CircuitMaker provides a wealth of analysis capabilities not found in other products in it s class No other product offers this nuch simulation muscle at such a reasonable price Printed Circuit Board Outpu
9. 91U01 09 3 seiNdoY 7661 YQIeW j March 1997 Popular Electronics co New ProducrTs GRAPHICAL MULTIMETER The Model 867B Graphical MultiMeter GMM is Fluke s most accurate hand held multimeter to date The instrument provides engineering and industrial users with exceptional graphical and reporting capabilities presented on the largest and most technically advanced display screen available in today s mar ket allowing information to be viewed quickly as trends waveforms compo nent V curves or logic symbols Several innovative technologies were used in the Model 867B s display including blue LEDs from Nichia of Japan The color is a broadband sky blue that is converted to white backlight by means of an amber filter Coupled with Hitachi s transmissive LCDs the backlight technology provides higher contrast and a significantly brighter image than other display modes while using less than half the power of back lights of similar intensity The Model 876B offers 0 025 basic DC accuracy which allows the detection of very small DC signal vari ations especially in low level trans ducers and analog electronics And because the backlight runs off of 5 volts there is no AC DC converter in the multimeter which produces very quiet readings The graphical multimeter also can measure small currents with 10 nA res olution That is useful for finding signal variations in general electron
10. North American SW Association recently reviewed an interesting book about the inner workings of the Voice of America and its news operations The book A Basement Seat to History Tales of Covering Presidents Nixon Ford Carter and Reagan for the Voice of America was written by Philomena Jurey Linus Press P O Box 5446 Washington DC 20016 16 95 Ms Jurey was employed by the VOA for some 28 years half of that as its White House news correspondent During that period she was responsi ble for the presidential news coverage that was heard by listeners around the world Arey says that the stories Ms Jurey relays of those administrations are told in a personal and very anec dotal style Along the way the radio enthusiast gets a taste of how the VOA was run through this era including issues such as programming and budget problems Though the average American knows little about our overseas short wave broadcasting Jurey makes it clear that American presidents have seldom doubted the VOA s power as a diplomatic tool This is a well written memoir says Arey worth the time of any radio hob byist with an interest on how this busi ness of international shortwave is conducted DOWN THE DIAL Looking for some interesting SW signals Try these Remember that Universal Coordinated Time abbrevi ated as UTC is equivalent to EST 5 hours CST 6 hours MST 7 hours or PST 8 hours GERMANY 6
11. 5 95 If you are using or intend to use the UNIX multi user operating system and want to get the most out of your computer system in terms of efficiency and Productivity then you must learn its operating system The book explains how the UNIX operating system is structured So that you understand what happens when you first approach your computer BP396 Electronic Hobbyists Data Book 5 95 This book provides a wide range of data If for example you require details of a modern five band resistor code or an old color code for a ceramic Capacitor the formula for parallel resistance or basic data on an NES534AN operational amplifier it is con tained within these pages The subjects covered are numerous and widespread to cover all hobbyist interests BP343 A Concise Introduction to Microsoft Works for Windows 7 95 The book explains and details How the Works for Windows package fits into the general Microsoft Windows environment how to use the word processor to advantage how to use Microsoft Draw to create and edit graphics and place them in your documents how to build up simple Spreadsheet examples and how single and multiple charts or graphs of different types can be generated And there s much more SHIPPING CHARGES IN USA AND CANADA 0 01 to 5 00 2 00 SORRY No orders accepted outside of USA amp Canada BP282 Understanding PC Specifi
12. NE1 Neon lamp type NE 2 51 85 DPOT switch B1 B2 volt alkaline battery Wire solde elc R4 R5 222 222 R6 470K NE1 NE 2 rD Fig 3 With this circuit you can turn 18 volts into 90 volts which is enough to power neon lamp NE1 91u01 99 3 JeiNdoY 7661 Yoseyy March 1997 Popular Electronics 18 volt source Five 22 ohm 1 watt resistors R1 R5 limit the charging current and protect the switch con tacts When all five switches are switched to the opposite position the five capacitors are connected in series to produce the 90 volt output When the neon lamp begins to dim flip the switches over to charge and bring them back for a bright light Some of you might think these antique voltage multipliers are of little value in today s high tech arena In the majority of cases you d be correct too But if you had no other method avail able at the time you d be surprised how some of these simple circuits might become very useful indeed Fig 4 Add some gain to a project with the circuit shown in A The values of R3 and R4 determine the oi of IC1 use the table in B to select them Lee PROVIDER Fis a OA op amp integrated circuit AY A2 10 000 ohin 1a watt 5 resistor AS R i watt 5 resistor isea table in Fig 46 for value CIA 7 pF a5 WVDG electrolytic capac S GR 02 47 uF 35 WVDC slectrolytic capac Wie se solder ete GAIN PROVIDER Sometimes its easy to
13. Optional Text Book Timid about getting on the World Wide Web You ve heard about the Information Superhighway and all the hype that goes with it Sort of makes you feel timid about getting on the Web Put your fears aside A new book The Internet and World Wide Web Explained eliminates all the mystery and presents clear concise information to build your confidence The jargon used is explained in simple English Once the tech talk is understood and with an hour or two OVER 50 of Web time under your belt your friends ovintentcstaion rant fODELS will believe you are an Internet guru To order Book 403 send 6 95 plus 3 00 for shipping in the U S and Canada only to Electronics Technology Today Inc P O Box 240 Massapequa Park NY 11762 0240 Payment in U S funds by I S bank check or International Money Order Please allow 6 8 weeks for delivery WINDOWS 95 One Step at a Time Don t know what to do when confronted with Everything y you need From 279 Cali for Free Info Pack or see Money Back Guarantee WEB at http www aesmicro com 714 550 8094 FAX 714 550 994 Call 1 800 730 3232 AES 970 W 17TH STREET SANTA ANA CA 92706 USA ao The portable 5 programmer that uses the eid fw printer port of gan your PC Ti a i ctoad of a PROMAX EMP 20 MEGAMAX MEGAMAX4 SIMM SIP TESTER EMUPA CALL ADVANTECH LABTOOL 599 EETOOLS SI
14. TINY MACHINES THAT THINK FOR THEMSELVES Popular Ele ctr nics Pager Decoders Flectronic Parrot It repeats everything you say without training a Receive beeper messages and phone numbers with a scanner and read them on a PC to recover stolen cars Build an Ae AC Line Voltage 4 Monitor N d 3 99 U S 03 gt EE nT 4 50 CAN i ke C 0912 878 7 Check the safety of your FP EE expensive gadgets NEW VERSION FEATURES OF ELECTRONICS WORKBENCH VERSION 5 WHAT S NEW Electronics Workbench Version 5 with analog digital and Nos 10 nes mixed A D SPICE simulation a full suite of analyses and over 4 000 devices Still the standard for power and ease of use oe ee Now ten times faster Still the same low price egroied Tosi wes OC V Join over 75 000 customers and find out why more engineers and hobbyists buy Electronics Workbench than any other SPICE simulator You ll be working productively in 20 minutes and creating better designs faster We guarantee it Z q fe ariel ANALYSES aia I Ty iit led S cal ein High End Features TRUE MIXED ANALOG DIGITAL YES FULLY INTERACTIVE SIMULATION YES VIRTUAL Test PEIL ANALOG ENGINE SPICE 3F5 32 BIT Digi DIGITAL ENGINE NATIVE 32 BIT O Ew GMIN STEPPING YES p re TEMPERATURE CONTROL EACH DEVICE PRO SCHEMATIC EDITOR YES RSION HIERARCHICAL CIRCUITS YES VEI arges VIRTUAL IN
15. You get a customized Pentium 166 or better PC to train with and keep You learn how to troubleshoot and maintain today s sophisticated PCs You explore the features you ve chosen for your computer from the memory chips to the high speed CD ROM drive You learn how to aa P 1 2 take advantage of PC communications and the Be Ges Internet Aga 1 3 You use your s new computer s 28 800 baud or faster fax modem in conjunction with Netscape Navigator Web browser software Cc u O GII Aa G N mmh amh S N 1 You explore the applications and accessories of Windows 95 today s hottest graphical user interface O UE the self booting ForeFront Troubleshooter software and CD ee ROM comprehensive diagnostics you can trust 1 D With NRI s new PC y Options Plan you can purchase low cost computer upgrades and peripherials for your customized PC 1 You have access to NRI s brand new cyberschool to contact your instructor download supplemental materials partici pate in online seminars and more 1 You can call NRI s TeleService hotline for 24 hour answers to your questions 1 q You get immediate 7 feedback with NRI s TeleGrading service featuring 24 hour exam grading 2 Your company may pay for all or part of your tuition Hundreds of companies do iz WESIAUNI ow re 4 m b 4 I MFN crois _ MICROCOMPUTER SERVICING C
16. jA Charge Gun 1 Life is Precious PROTECT IT 2 Stuns amp Immobllizes attackers gt Si 15 feet away Check your state i 19 95 Nota a Uses electronic or pieze ignition CAUTION REQUIRED 1 Taoa FREE with Order or send 1 P amp H G i me Creditable to purch High Quality Laser Pointer f ECG1 LAPN64 15mw equy 2000 a 6 HS LAPN61_SOmw equy 4000 STUN200 200 000 Volts power than most handguns No cout das injury ID coded CGi Data zt 10 00 amp 0 Charge Gun Ready to Vee includes FREE Stun Gun 249 50 STUN GUNS sold nie o STUN100 100 000 Volts ssm 34 50 sever 49 50 aes Phone i 800 221 1705 Orders Only Pleasel EPROM PROGRAMMING SYSTEM USES PARALLEL PORT EPROMS 24 28 32 amp 40 PIN 27C AND 25XX 1702 2708 TMS2716 32 32A 64 64A 128 128A 256 5 12 513 0 1 010 101 1001 1000 1024 2 10 020 200 1 220 2048 400 1 2 040 080 240 4096 68 764 66 28F256 28F512 28F010 28F020 29C257 29C010 29C040 29F010 29F040 EEPROMS amp NVRAMS 18 24 amp 28 PIN CXX 2210 2212 2804 2816 2816A 2817 2864 2865 28256 28C010 DS1220 DS1225 DS 1230 8 amp 14 PIN PLUS CXX ER1400 M58657 2401 02 04 08 16 32 65 2444 aet 59C11 8001 1A 9306 46 56 66 8572 82 92 68 9XX SYSTEM INCLUDES Learn MICROCONTROLLERS 5 EMBEDDED SYSTEMS and PROGRAMMING with the AES learning system embedded control system Extensive man
17. s world is a beautifully rendered intricate land with exciting 3D elements For in stance when Mario climbs inside a can non the view switches to a first person perspective as Mario is blasted through the air to a safe landing if you ve aimed well The game s objective is to rescue the princess and defeat Bowser To do so you must explore 25 different areas including a desert an undersea landscape a haunted mansion and snow covered mountains As you travel through each of those en vironments it s easy to lose sight of the objective There s so much to see and do along the way the ultimate goal doesn t seem SO important Truly goal oriented individuals can as certain Mario s position at any given time and make strategic game playing deci sions by checking a map As the game goes on Mario can gain the strength of up to eight plumbers sO a at Dx a BO Mario swims with the fishes in one wa tery landscape a2 ee a he Ba eb a z ee CIRCLE 57 ON FREE INFORMATION CARD At each level of play Mario can lose power when he is attacked by various en emies His remaining strength is denoted by a circular power meter power can be replenished by finding power ups Mario runs jumps somersaults vaults Power Play PLAYSTATION GAME CONSOLE Man ufactured by Sony Computer Entertain ment America 919 East Hillside Bivd 2nd Floor Foster City CA 944
18. 2V 20V 200V 1000V DALCO Order N Brand Min Price BU 208 TESLA 10 1 49 grade cleaner for tuners BU 208 0 TOSHIBA 1 4 50 controls and PC boards Srm Ur 4 a TUN O WASH is excellent cleaner and 2SD 1398 SANYO 10 1 49 degreaser for tuners ane and PC boards 2SD 1650 SANYO 65 1 69 e Designed for cleaning and degreasing STRD 1005 SANKEN 1 4 15 consumer electronics Cleans in one step no STR 30130 SANKEN 1 2 66 rinsing required Contains no ozone depleting STRS 6301 SANKEN 1 8 50 TA 7777N TOSHIBA 1 6 96 compounds CFC and HCFC free TDA 2005 SGS 5 1 49 e Not for use on energized equipment 12 5 Oz aerosol 12 cans per case COLOR CODED 2 i VCR ALIGNMENTTOOL KIT LEADS HEAVY DUTY ORDER N2 56 500 e 11 Long Wire Lead e insulated 1 Alligator Clips e 20 Gauge Wire Size 10 Leads BLACK GREEN RED YELLOW WHITE SOLDER WICK i Tis Solder Remover _ 85 z i ig Sete r e Length 5 Feet ORDER N 51 1050 M2 Pes TEMPERATURE CONTROLLED SOLDERING STATION e Adjustable Temp 300 F 790 F 150 C 480 C Grounded Tip for Soldering Static Sensitive Devices Heater Aid Led Power Temperature Indicator Overheat Protection W Temperature Controi Auxiliary Grounded Terminal a Comes in digital LED display 48 Watts soldering iron ORDER N2 51 1035 64 0 aa ORDER 50 888 The mest popular VCR Head puller Retaining ring remover Spring hook e M
19. All too often how ever that camcorder spends most of its time gathering dust in a closet be cause its owner became frustrated try ing to create good videos This book tackles the closet camcorder head on It teaches beginners how to avoid some of the most common problems with home video footage including continued on page 75 TECHNOLOGY UPDATE The efficiency of ceramic warmth combines with oscillation to create the perfect heater This compact heater uses a genuine ceramic heating element and an oscillating fan to eliminate cold spots and provide intense warmth throughout an entire room by Irma Westburg features would it have A safe yet effec tive heating element A thermostat that would let you select a desired comfort level An effective way to disperse the heat through out an entire room Safety features like auto matic tip over and overheat protection EXTENSIVE F pop up door to control panel J f you could build the perfect heater what power indicator light safety indicator light power switch ceramic heating easy carry element handie solid state removable circuitry fitter cool touch high cabinet velocity fan The RST 1200 is the only heater that combines the intense warmth of a ceramic heating ese ment with a solid state thermostat and an oscillating fan The result An energy efficient space heater that will consistently heat an entire
20. Include 5 Shipping Visa MC Accepted NCD Box 384 Osceola bsd 64776 puts 2 Outputs infrared Controllable Routes Any In put to Any Output 12 18 volt DC operation For Line Level Signal Switching AVS8 Kit 129 Asm 179 High Powers DC Motor Con trollen 9 12 Volt Operation for Motors Up to 4 Amps Forward Reverse 64 Speeds With Infrared Receiver Hexfet H Bridge Driver stage NCD M1 Kit 129 2st CABLE TV Converters amp Descramblers Compatible with Jerrold Scientific Atlanta Pioneer Oak amp Hamlin Equipment BRAND NEW 6 MONTH GUARANTEE LOWEST PRICES Volume Control amp Parental Lockout Available Greenleaf Electronics 1 800 742 2567 NO ILLINOIS SALES it is not the intent of Greenleaf Electronics to defraud any pay television operator and we will not assist any company or individuat in doing the same 1 80 Motion Multi Power 8 16 Hobby Servo Controller Futaba J Compatible Infrared Receiver Included with SV16 upgrade Perfect for anima tronic applications SV8 Kit 79 Asm 99 SV16 Upgd Kit 39 Asm 59 For F Stepp r Motors One Step per Received Byte Four LED Coil Lights Included Hi Power Hexfet Driver Stage Optoisolated and Very Small 1200 9600 baud operation STP Kit 39 Asm 49 Se AL Networkable Devices Quad Relay Driver includes 4 LED Status Lights 12V Op eration With 5 or 10 Amp Relays Optoisolated RS 232 Input Call for inf
21. Os SIONAL LEVEL maven 953 eae EE cart Test Instruments Equipment Tools amp Supplies For Electronic Production Maintenance amp Service 8931 Brookville Road Silver Spring MD 20910 800 638 2020 Fax 800 545 0058 CIRCLE 144 ON FREE INFORMATION CARD Electronic Training Videos gy Learn electronics quickly and ee professionals will find the mae UCANDO videos to be a valuable Bee E Ee these videos aren t the best learning tools you ve ever seen return them within 30 days for a complete refund These videos are being used by Tech Schools CET s Military Branches Ham Operators Industries and more across the United States and around the world Order today and see how UCANDO is Changing The Way The World Learns Electronics ee ee O IM T fs TV Part 3 Audion Fi er Optics Laser w SAVE 6 videos for only 240 or 12 videos for oniy 450 m 1 800 678 6113 amp or mail check or money order to WIA UCANDO Videos 4 P O Box 928 ha Greenville OH 45331 Said FREE Shipping FREE Catalog CIRCLE 136 ON FREE INFORMATION CARD Sate CALL 1 888 561 4796 FOR ALL YOUR CABLE TV NEEDS GET THE COMPLETE PICTURE ORIGINAL EQUIPMENT TEST ACTIVATORS FILTERS 97 106 108 110 REPLACEMENTS FOR ALL SYSTEMS HAVE MAKE AND MODEL NUMBER READY GUARANTEED LOW PRICE SAME DAY SHIPPING CALL NOW 1 888 561 4796 I 1 YE
22. Serial amp parallel mode Relative mode for comparison and to remove parasitics Statistics tolerance C wal UPAY COR MEIER adanida Becas HE 20 MHz Oscilloscope with Delay Sweep PS 205 429 95 Dual Trace Component test 8 CRT X Y Operation TV Sync Z Modulation CH2 Output Graticule Ilium 2 probes each has x1 x10 switch Best price with delay sweep PS 200 20 MHz DUAL TRACE 339 95 PS 400 40 MHz DUAL TRACE 494 95 PS405 40 MHz DELAY SWEEP 569 95 PS 605 60 MHz DELAY SWEEP 769 95 PS 1000 100 MHz DUAL TRACE 999 95 Scope Probe 6OMHz x1 x10 15 100MHz x1 x10 22 250MHz x1 x10 29 250MHz x100 39 DC Power Supply PS 303 159 00 0 30 VDC 0 3A ut Constant votag amp constant correct mode MENIH lt a Full line of DMMs HIGH QUALITY TEST EQUIPMENT BEST PRICE Fluke Multimeter Fluke 12 84 95 Holster C 10 10 Fiuke 70 li 75 95 Fluke 73 il 97 50 Fiuke 75 il 129 Holster C70 16 Fluke 77 II 155 Fiuke 79 ll 175 Fluke 29 II 175 Fluke 76 175 Fluke 87 287 Fluke 867 1199 Scope Meter Fiuke 97 1785 Fluke 105 2799 DMM 20 74 95 Inductance 2mH 20H i 2nF 2000F Resistance 200 200MQ F 35 Digt i DC AC Current and Volts Transistor hFE diode est Continuity Duty Peak hold Max Ruggerdized case Rubber holster 8 00 economy compact ruggerdized solar oe motive industrial pent A starts from 10 95 Frequency Counter FC 1200 129 95 F
23. Suggested retail price 44 95 New Year s Day has come and gone how are your resolutions holding up Have you knocked off a few pounds yet Still walking a few miles each moming Put ting 10 of your take home pay into sav ings Called your parents at least once a week without asking for money Finished cleaning the basement or garage or attic And this one s a perennial favorite are you Organized yet Have you cleaned out your Rolodex Updated your address book using the return addresses on all the Christmas cards you received a couple of months ago Come up with a way to re member your appointments birthdays and your anniversary If you re anything like us your inten tions were good but somehow your busi ness card collection is still jumbled in a desk drawer and you never even got around to sending out Christmas cards let alone save all the envelopes from the ones you received There are three whole pages in our address book devoted to a family member who refuses to stay put in either a home or a job But we can chronicle his last dozen or so addresses jobs home business and fax numbers and even the names of some of his also usually tran sitory girl friends just by glancing at the entries crossed out in our book It s an interesting but highly inefficient system We ve sought out electronic help by purchasing pocket organizers In the spirt of keeping resolutions we began transfer ring th
24. countrios 29 45 Subscription orders payable iti US funds only Internatianal Pastel Maney Order or check drown ana LES bank U S single copy price 3 50 Copyright 196 by Gerback Publications ack Publications Inc Populer Electronics ine All rights resarved Hands on Electranie s and Gizmo trademorks are registered In Us and Canada by Ge trademark is registered in US on Corodo by Electronic ct Technology Tote Ine Gnd is fieensed to sen cota Publications Ine Preg KUFA Postmaster Please sand nikis changes Hx Papilar lectrenies Subscription aps FO Bon 338 Mount Moris 1 61054 9932 ARERR self addressed envelope nust accampany all rine manuscripts and or cod ar photographs if their return ie ee wheel they be rejected We diseloam any deb iia For the toss or damog al manuscripts andar artwark or photographs while in our possession or otherwise As otervice fa readers Peik PEER publishes available plane i ifaationcoloing to newsworthy product lahai ond scentific and techno Paica devolopments Because of possible varngrces in the quolity onid condition of materials and we p used by readers Popolar Electronics dla claimsany responsibility far Ie sofe and pr oper functioning at readerit projects bused opan or from plni or information published inthis magazine gla Hectrg CS SO U0I 09 3 Je NdOY 7661 Yaey March 1997 Popular Electronics N PRODUCT MARCH 1997 REVIEWS 24 Gizmo Ni
25. spy switch And insights into designing Fax interception devices and STO PPI ING modifying existing Faxes into Stealth Faxes POWER ox 29 Exposes ALL issues relating to PBX hack wi ETE RS 7 7 ing including countermeasures Can you AS reported on CBS 60 Minutes afford a 90 000 phone fraud loss avg loss How certain devices can slow down of hacked PBXs Featured in Forbes 29 even stop watthour meters while loads draw full power Device sim mA VOICE MA IL ply lugs into one outlet and normal A HACKING ads into other outlets Also describes meter creep Overload droop ete Pians S How VM Box systems are used LO psy Jung and ways they are hacked Ste j Includes ASPEN MESSAGE Sahi 4 CENTER BIX GENESIS EZ SYDNEY PHONE MAIL CENTA GRAM CINDY AUDIX SPERRY more A must for security types 29 y A CREDIT CARD SCAMS aes Prgoueral Wit Att New TOP SECRET Details every known means of credit card gt MIND MAIL 3 fraud and scams Protect yourself 29 OR 1 WITH ORDER Are you overpaying your cable company You are if AD you are leasing their equipment o Forest Electronics Inc offers a complete line of New Cable Decoders and Converters that are fully Compatible with your cable system o All systems come with Remote Control amp Parental Guidance Feature Volume Control is al
26. try sectors from airbag sensors tO gy roscopas to medicine The motors which develop 0 5 mi crawatts of power delivered through a gear thats 50 microns In diameter could be used medically where they are seen as serving as tiny drug deliv ery devices within the body Imagine cumps tnat are no larger than the perod ct the end of this sentence floating crourd the bloodstream CMOS Device Area amp m arse ric dopede pitaxial layer Mio omechanical Device Area iS Hind Mechanical Poly tata Poy j This Sandia National Laboratory diagram shows their micro innovation The trench at the far right which is only microns deep makes possible the fabrication of a wide variety of micromachines Microcircuitry on the left provides the brains of the machine searching for instance for HIV in fected cells The blades of mini gears could one day churn through arteries chopping up plaque This new micro technology process also allows for the development of small inexpensive and durable elec tronics such as gyroscopes The latter have military and civilian uses that could have a dramatic impact on the design of future automobiles and mili tary systems Eventually we may even employ armies of the tiny little things to clean up polluted rivers or toxic dumps This will be a big enabler for a vari ety of new products to be produced that are small smart and cheap said Paul McWhorter p
27. 085 kHz Bayerischer Rundfunk in Munich is one of the pri vate German shortwave outlets This has been reported around 0045 UTC with German language programming but American country and western music GUATEMALA 4 835 kHz Radio Tezulutlan has been logged both morning and evening on this frequen cy Try around 1125 UTC and 0145 UTC Programming is of course in Spanish and local marimba music is often heard IRAN 6 050 kHz Voice of the Islamic Republic of Iran VOIRI in Teheran can be heard on this frequency around 0030 UTC with English programming SWITZERLAND 6 135 kHz Swiss Radio International has an English newscast at 0400 UTC ZIMBABWE 3 396 kHz Zimbabwe Broadcasting Corp in southern Africa suffers from some interference from a radioteletype signal but still can be logged on occasion around 0350 UTC with African highlife music and English commentary IRCUIT CIRCUS Power Up elcome circuiteers Lets pop the lid off of the old circuit pot again stir it a little and select a few hopefully useful and interesting items to look over Our first three circuits are offered in response to a fellow experimenter who wanted a cheap and simple way to light a neon lamp using just two 9 voit batteries and without using a trans former or any solid state devices He also wanted to double the output volt age of a 9 volt battery and supply a negative low current bias voltage in a similar manner So witho
28. 1 800 327 2601 http www windjammer com a Windjammer Barefoot Cruises P O Box 190120 Dept 5568 Miami Beach FL 33139 0120 June mid Dec sailings only Restrictions apply E a ath A Rin GIR E E CIRCLE 172 ON FREE INFORMATION CARD with a standard slim line battery installed The battery provides 60 min utes of talk time and 10 hours of standby time The CT 500 offers several conve nience features including automatic re dial of any of the last ten numbers and nine programmable one touch memory storage locations for priority numbers The phone s flip cover remains closed to protect the keypad when not in use lts LCD can be read in almost any light ing condition In automatic answer mode calls are answered after two rings Dual number capability saves on roaming charges An electronic lock can be used to prevent outgoing calls except emergency 911 calls The CT 500 cellular phone sells for 69 99 with activation In California the price is 169 99 due to state legal requirements Prices require a new activation and minimum service re quirement with a RadioShack autho rized cellular service carrier For further information contact RadioShack 700 One Tandy Center Fort Worth TX 76102 Tel 800 THE SHACK Web http Avww tandy com rs CIRCLE 83 ON FREE INFORMATION CARD ANTIQUE RADIO eee Free Sample ae 2 Antique Radio s i ILA Largest Circulation Monthly ES Articles Ads amp
29. 2 2pF to 2 2uF Power requirement 9v Gain 1MHz 20dB to 2 5GHz 6dB Station Any stereo sig DC SIZE 1 80 x 2 e Power requirement 12v 6Ma nal you plug into the kit 12 95 wBA 6 KIT 19 95 FMST 100 will be trans Please add sufficient postage First ib 5 00 Canada 7 00 iasecaa U WIDE BAND PRE AMP mitted to any FM radio Additional LB Add 1 00 US FUNDS ONLY tuneable ss 76 to 108MHz FM Transmit a wire less link through an auditorium from your car to your camper listen to your CD s while mowing the We will accept telephone orders for Visa or Mastercard lawn Play music on one channel sing on the other Clarity is excellent aprox 40dB stereo separation Electronic Rainbow Ind Inc Length of antenna determines the distance of trans gt gt mission Complete with stereo input level controls amp 6227 Coffman Rd Indianapolis IN 46268 crystal for stereo separation 9v battery operation 7 S ZE 15 x25 x3 i ELECTRONIC CALL 317 291 7262 FAX 317 291 7269 FMST 100 Cabinet 8 95 r 29 95 RAINBOW INTERNET www rainbowkits com CIRCLE 148 ON FREE INFORMATION CARD Jii 6N S91u01 938 3 18jNdOdg 7661 yasey e e w March 1997 Popular Electronics i Each cassette has its own 4 plastic storage box Satisfaction Guaranteed CAT VCU 8 CAT SMS 140 250 for 50 00 CAT 4 00 35 45 volt sso er stavo ron 2 ooer 799 a
30. 4700 ohm R9 12 000 ohm R10 30 000 ohm R11 43 000 ohm R12 150 000 ohm CAPACITORS C1 470 pF ceramic disc C2 0 047 4F ceramic disc C3 C9 0 1 wF monolythic ClO 10 pF 16 WVDC electrolytic Cll 22 pF 16 WVDC electrolytic C12 C1S 100 wF 16 WVDC electrolytic ADDITIONAL PARTS AND MATERIALS MIC Electret microphone Digi Key P9949 ND or equivalent SPKR 8 ohm speaker Sl1 Pushbutton switch Digi Key SW403 ND or equivalent H1 H2 2 pin header with shorting block Bl 9 volt alkaline battery Printed circuit materials IC sockets battery connector 22 gauge twisted pair wire hook up wire solder hardware etc Note The following are available from LNS Technologies 20993 Foothill Blvd Suite 307R Hayward CA 94541 1511 Tel 800 886 7150 complete kit of parts for the Electronic Parrot PARROT KIT including etched and drilled printed circuit board speaker battery holder and all other components listed above 29 00 Parrot talking back IC ICHT8656A 10 00 PC board PARROT PCB 10 00 Please add 5 00 shipping and handling California residents please also add local sales tax MasterCard VISA orders are accepted No C O D orders pieces of solid wire to the board for the two jumpers Next install and sol der the two Zener diodes in place noting their polarity Then move on to the resistors and ceramic capacitors Be sure to observe proper polarities when inst
31. 5 characters per codeword in 4 bit format and two and six sevenths characters per codeword when using 7 bit format Characters are transmitted in the order that they are to be displayed but within each character the bits are transmitted in reverse order relative to the convention used in the address codeword The low order bit of each character is transmitted first The characters of the 4 bit format are shown in Table 1 The characters of the 7 bit format are standard ASCII When the last codeword of a mes sage is partially filled the unused portion is filled with space codes 1100b in the case of 4 bit data or zero bits in the case of 7 bit data The BCH 31 21 error correcting code allows up to 2 erroneous bits per codeword to be corrected by the receiv ing device Bits 22 through 31 of each POCSAG codeword contain 10 redun dancy bits based on this code Note that this applies to ALL codewords in cluding synchronization and idle co dewords A POCSAG decoder is expected to run an error correction al gorithm as the first step in processing received data even Cefore syn chronization codeword detection since synchronization words may themselves contain errors The BCH code used here is based on an 11 bit generator of binary Starling ond ti ns Data pattern Generator PE BOL Oreo d 11101101001 The 10 redundancy bits are created by performing a poly nomial division operation between the z
32. 67002 RPO Maples ELECTRONICS Winnipeg MB R2P 2T3 204 697 3488 se OSCILLOSCOPES from 169 ATC O Scope uses printer port to turn PC AT into SWITCH POSITIONS THERMOSTATS LIQUID LEVELS a Digital Storage Oscilloscape Spectrum Analyzer Freq Counter Logger DVM DC 500KHz RELAYS LIGHTS MOTORS TEMPERATURE PRESSURE LIGHT LEVELS HUMIDITY MODEL 30 79 MODEL 45 189 as ren mo peoos RS 232 INTERFACE fi Ti 8 anatia TER aae as i u monar y o Spectrum Print log to disk or export data Single channel units from 169 e Accepts standard scope probes Dual channel units from 349 Uses standard printer port Options are e Small and portable Bake acts en h SSRI o Works with laptops e Automotive probes Ead UP TO 60 BMP SEC B Same day shipping Battery packs Made in U S A Order yours today 800 980 9806 MC Visa Amex PRAIRIE DIG sa lilt Allison Technology Corporation PHONE 608 643 8599 F AX ret 8343 Carvel Houston TX 77036 USA 16 BEV PH 713 777 0401 FAX 713 777 4746 BBS 713 777 4746 i A alie a SPRAJNE raa eA ein http www atcweb com CIRCLE 47 ON FREE INFORMATION CARD Si CIRCLE 137 ON FREE INFORMATION CARD AMREL Offers Lowest Prices amp Best Warranties on DC Power Supplies ANYWHERE Renn RELIANCE ao AMREL Offers Superior Analog Power i AMRBL a SE j r mr E Supplies Starting as Low cs 1
33. 79 95 99 95 XTR300 TRACKING TRANSMITTER KIT Ja CRYSTAL TRANSMITTER KITS T XBD500 a wee Ultra miniature surface mount construction 149 95 E Z kit approach makes assembly a snap f Professional quality ch Miniature batt dipoli tad f Nota kit ready to use 7 iniature battery and holder mounte t Covers 1 to 2 000MHz om directly to the circult board XTL1 000EZ y i Uses new Microwave Tranamit to enys scanner typo receiver EE Integrated Circuit amplifier 69 95 gar oram a SSS ae Adjustable sensitivity XTL3000 XTL1000 Audio jack for privacy ear phone LONG RANGE TRANSMITTER KIT TRANSMITTER KIT A Any intercepted signal causes an audio Transmits continuous beep beep beep Sensitive built in microphone Sensitive built in microphone tone that increases from a low pitched Ideal for locating lost or stolen items dials a up to 1 2 mile XMR2000 29 95 Worlds smallest FM radio As small as a hearing aid Weighs less than 1 4 02 Digital touch tuning deai for use with our 88 108MHz FM transmitters XPC 400 400 LINES OF RES Includes power cube About haif the size ofa XPS 1000C 55 95 TELEPHONE SNOOP KIT Dial home from anywhere and hear in side your home TouchTone coded for secure operation Stop burglars and intruders Reliable 24 hour protection Serving the public since 1981 ELECTRONICS INC 1270 E Broadway Rd 11
34. Arnold Palmer s trophy room All of this adds up to incredible realism It s almost as realis tic as the actual game except that you ll never get rained out How many of you are familiar with DEVO They were one of the first new wave bands if you want to all them new wave actually used to like them although haven t listened to them in years But know there are still plenty of die hard DEVO fans out there who won t be able to resist playing Inscape s DEVO Presents Adventures of the Smart Patrol a multimedia game created by the founders of DEVO It s a battle between good and evil where you must help the Smart Patrol save Spudland from the dread ed disease with a bizarre name Osso Bucco Myelitis lm seeing more and more software intended for children and have a bunch of it this month figure it must be because our kids are now better at using the computer than we are so there s a high demand for suitable material Heck my son is under two and already knows how to put disks in my computer not that want him to just yet How many of you still remember Highlights for Children magazine still do sort of but it s been a long time for me Its a magazine devoted to teaching children in entertaining ways Anyway Creative Multimedia has a new CD ROM out called Highlights Interactive that coincides with the magazine s 50th anniversary It s intended for kids ages 5 and up The disc teaches words co
35. BBS 983 1234 Web www generaldevice com E Mail icdevice best com S91U04499 3 JBINdOY 7661 Yuey presentation of the fre quently used features that make Windows r ee ae es es ee ee a 95 so valuable to the PC user EXERCISE Be a PC repair expert To order Book BP399 send 6 95 plus 3 00 for l Approved home stucy Leam to troubleshoot P 4 A ile repair install upgrade and service Computers shipping in the U S and Canada only to C i Free literature 800 223 4542 Electronics Technology Today inc P O Box American Heart Name n i Address Phone 240 Massapequa Park NY 11762 0240 Payment AS sO Ci ati on sae T in U S funds by U S bank check or International School of PC Repair DEPT JJC341 PCDI 6065 Roswell Road Atlanta Georgia 30328 Money Order Please allow 6 8 weeks for delivery ee oe oe Our Complete E Catalog is aS now March 1997 Popular Electronics Ry online i ka E Si t digital multimeter designed for engineers Fantastic DMM Offer Don t let the price fool you This meter is a and hobbyists Equipped with 5 functions and 19ranges Each test position is quickly and easily selected with a simple turn of the FUNCTION RANGE selector rotary switch R r Boot Included General ubber Bo Our Display 3 1 2 Digit LCD 21mm Figure Height Best with Automatic Polarlty Overrange Indication 3 Least Significant Digits Bla
36. CET President ext 201 e mail advertising gernsback Christina Estrada Assistant to the President ext 209 For Advertising ONLY 1 516 293 3000 Fax 1 516 293 3115 Larry Steckler publisher Arline Fishman advertising director ext 206 Michele Torrillo advertising assistant ext 21 1 Adria Coren credit manager ext 208 Subscription Customer Service Order Entry 1 800 827 0383 7 30 AM 8 30 PM EST ADVERTISING SALES OFFICES EAST SOUTHEAST Stanley Levitan Eastern Sales 1 Overlook Ave Great Neck NY 11021 3750 1 516 487 9357 1 516 293 3000 Fax 1 516 487 8402 slevitan26 aol com MIDWEST Texas Arkansas Oklahoma Colorado Arizona Ralph Bergen Midwest Sales One Northfield Plaza Suite 300 Northfield IL 60093 1214 1 847 559 0555 Fax 1 847 559 0562 bergenrj aol com PACIFIC COAST Mountaln States Anita Bartman Hutch Looney amp Assoc Inc 6310 San Vicente Blvd Suite 360 Los Angeles CA 90048 5426 1 213 931 3444 ext 227 Fax 1 213 931 7309 Oo G prm E AT ME a ADe PUBI N Bar Ed Sap Hosa N hee k RG cD 159k Vecl f 12v ki ese Vain 9 UL R4 1 M 10k O2uF U2 I 2 UA74L 39 8k ati 10 kHz 100m 100 v be Bo L 525 401 9 h 4 ty Vael Veez Ei 12V _ a 12 00 V x Re t Ground Aer 250 0u Xb 150 0u a b 100 0u myc 110 4m Yd 10 4m c d 214 8m j Y 358mV Div Ref Sround X 83 3uS Div Professional Schematic Layout
37. Canada no foreign orders HEATH COMPANY is selling photocopies o most Heathkit manuals Only authorized source for pram manuals Phone 616 925 5899 8 4 HOME automation via phone No expensive com uters Furnace air conditioner on rer otely ians 10 95 AMR CTR PO Box 1176 Wal tham MA 02254 1176 HACKERS catalog Hard To Find kits and as sembled equipment Red box spy cable etc Low prices 1 00 SMITH 05 Box 371 Sedar Grove NJ 07009 ELECTRONIC Project Kits www qkits com 1 888 GO 4 KITS 292 Queen St Kingston ON K7K 1B8 QUALITY KITS Gre 1098 82 50 anpeing Orde toa NESS 22 W Henriette Ava PO Box 1801 TRANSFER paper for printed circuits witk laser or copier excellent quality 30 sheets 8 5 X10 with instructions 24 00 send check or money o der to G SANTA MARIA 1602 A Washington Ave Suite 915 Miami Beach FL 33139 WE design fabricate and assemble single cr dou ble layer PCB s Fast turnaround 30 years experi ence State of the art equipment Small runs O K Write or call for information SHORE PRINTED CIRCUITS 1658 Route 9 Toms River NJ 8755 908 505 6363 Fax 505 6266 ALL in one catalog 60 mouth watering pages CB HAM audio TV spy broadcast science proj ects micropower broadcasting broadcast transmitters amptifiers antennas secret books start ar own radio station and more Senc 1 00 to PAN COM INTERNATIONAL PO Box 130 P3 Paradise CA 95
38. Classifieds A Month Trial 18 95 1 Yr 36 95 53 95 1st a R C P O Box 802 L16 Carlisle MA 01741 Phone 508 371 0512 VISA MC Fax 508 371 7129 YOUR FREE CATALOG KNOCKED MY SOCKS OFF We get that sort of comment all the time People are impressed that our free Consumer Information Catalog lists so many free and low cost government booklets There are more than 200 in all containing a wealth of valuable information Our free Catalog will very likely impress you too But first you have to get it Just send your name and address to Consumer Information Center Department KO Pueblo Colorado 81009 25 Reasons Way NRI TRAINING in COMPUTER SERVICING Is Your Best Choice For Garcer Success 1 You train with and keep 2 You can prepare for ccording to the Department of Labor jobs for computer service technicians will be up by 38 in the next 10 years Isn t it about time that you looked into NRI training You don t need any experience to get started You can depend on NRI a division of The McGraw Hill Companies You study at home at your own pace You put theory into practice with hands on projects You work one on one with an experienced instructor You establish a solid foundation with a review of basic electronics You train with the NRI Discovery Lab to experience circuit design and modification You train with a digital multimeter for quick and easy testing
39. EE 5 01 to 10 00 3 00 ae _ 10 01 to 20 00 4 00 Shipping see chart 02 _ _ 20 01 to 30 00 ae 5 00 Subtotal Oem ere rata erent OE OE ratte er erate art PO EOE EEE DS tateenstnnstorie aiiis 30 01 to 40 00 6 00 SIE Ee eC o Amount Enclosed oo 40 01 to 50 00 7 00 50 01 and above 8 50 All payments must be in U S funds No of Books Ordered S21U01 98 3 NdOd 7661 yey MN ot March 1997 Popular Electronics GIZM Will You Still Love Me When I m 64 NINTENDO 64 64 BIT VIDEOGAME CONSOLE Manufactured by Nintendo of America Inc 4820 150th Avenue N E Redmond WA 98052 Tel 206 882 2040 Suggested retail price 199 95 The much hyped long anticipated mo ment has arrived Nintendo 64 the first 64 bit home video game console is finally being sold on our fair shores Was it worth the wait Was it ever Its introduction has been a long time coming Nintendo once the uncontested leader in the fickle field of video games intentionally sat on the back burner as its arch rival Sega and relative newcomer Sony battled it out in the 32 bit arena As the Sega Saturn and Sony PlayStation re viewed later in this issue of Gizmo stirred up the somewhat sluggish videogame mar ket Nintendo was busy cooking up its next generation 64 bit machine That s not to say that Nintendo has b
40. Feeling and FM Hori zonte in Buenos Aires Satellite signals also are received from Argentine TV Stations Barrera says that as of this writing Radio Nacional Arcangel San Gabriel is best heard after 1900 UTC when inter ference ends from shortwave neighbor Africa No 1 in Gabon West Africa on 15 475 kHz The sign off at 2000 UTC he notes is nominal and can vary from as early as about 1945 UTC The SW outlet leaves the air with an instrumental anthem Aurora LRA36 Radio Nacional Arcangel San Gabriel will usually verify any cor rect reception reports with a QSL card its mailing address is in care of Base de Ejercito Esperanza 9411 Antartida Argentina S 31u01 99 3 eINdoY 7661 YEW March 1997 Popular Electronics rs You can Build Gadgets Here are 3 reasons why E BP345 GETTING STARTED IN PRACTICAL ELECTRONICS 5 95 if you are looking into launching an exciting hobby activity this text provides minimum es sentials for the buiider and 30 easy to build fun projects every experi l menter should toy with Printed circuit board designs are included to give your project a pro fessional appearance g BP349 PRACTICAL OPTO ELECTRONIC PROJECTS 5 95 If you shun opto elec tronic projects for lack of knowledge this is the book for you A bit of in troductory theory comes first and then a number of practical projects which utilize a range of opto devices from a f
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42. Programmer s Handbook Programmer s Examples on two 3 5 Q Gunsmithing Dept 92410 inch disks Programmer s Flowchart Template and a booklet QO Woodworking Dept 43663 Selecting the Right Computer Q Upholstery Dept 81332 AM Other schools force you to buy a complete computer Q Vinyl Repair Dept 71225 BELSAW package as part of their training program At Foley Belsaw we Q Electrician 95177 Since 1926 ai Q Computer Specialist 38170 understand that your needs as a programmer may not fit into a one size fits all approach Why should you pay hundreds of dollars for a computer system that you may not need Mail this coupon or call today J Networking Specialist 39157 understand that there is ABSOLUTELY NO OBLIGATION and NO SALESMAN WILL CALL We ll tell you what you need to know so that when Nate you re ready to buy your own computer you can get the Address machine that fits your needs at the lowest possible price That s the Foley Belsaw way ON a Z Zip 105 sojuoljoa 3 1ENdOd 7664 yore March 1997 Popular Electronics o Q LEADER For Professionals Who Know The Difference Oscilloscopes Video Sync Test Generators Waveform Monitors Vectorscopes EFP ENG Instruments RF Signal Level Meters Audio Generators amp Meters Frequency Counters Meters amp Bridges Power Supplies Function Generators e RF Generators PRINT Products International
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44. Sparks Worldwide Plunge of Markets im CYS ERTIMES Futurist Predicts The Fall of the 1 eae se all rf cf a es ae ee Be sh i pick a password enter the verification code they ll e mail to you and access the Times When you first log on you see a computerized version of the cover of the New York Times To the left of the headlines there are several selectable categories that you can click on Front Page like the name implies has headlines from the front page of that day s edition News by Category gives you a simulated ability to turn to a particular news section Job Market and Classifieds are par ticularly powerful sections to enter For get about scanning pages looking for a particular item In true advanced web site fashion you can simply enter a few keywords and look for a particular career or item for sale for example Those particularly interested in the BY DAN KARAGIANNIS Internet should check out CyberTimes and Web Specials Politics Business Editorials Letters Op Ed are pretty self explanatory sections as are Arts amp Leisure Travel and Real Estate Again clicking on any of these sec tions gives you the information from the current edition What if you want to find old stories That s possible too sense the demise of library microfilm coming You can search the Times site by filling out an online form For starters enter up to three search terms and decide whether to
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46. YOU LL BE AMAZED both at how rapidly you learn with these cards and how easy it is to understand These new cards are available right now Don t miss out Send your check or money order today SS Se ee es Ss ee ee se ee es ee ee FACTCARDS Facts at your fingertips for Experimenters and Project Builders Please send one copy of FACTCARDS at 3 50 Shipping 1 00 U S and Canada only Please send Please print Name copies of FACTCARDS Total cost is sum of copy price and First Class postage and handling cost multiplied by number of card sets ordered New York residents add sales tax to total cost of each order Allow 6 8 weeks for the material to arrive Street Address City State Zip Funds Detach and mail today CLAGGK Inc P O Box 4099 Farmingdale NY 11735 All Payment must be in U S 85168 Supplement to Popular Electronics March 1997 UT YOUR PC TO WORK is gt a3 si MACHINE YOU i BEEN WAITING FOR AUTOMATICALLY PROTOTYPE PC BOARDS MACHINE 30 PI PARTS F ROM CAD CARVE ROUTE MILL amp DRILL WOOD 2 PLASTICS amp LIGHT METALS Home Automation to receive and transmit all X 10 commands Create your own automation system tuming on off any device plugged into an electrical outlet with responce to time date other X 10 transmissions or an computer Input stimull 38 50 Telephone Scrambler Scrambles your voice before f sending it
47. a ness It comes with six IR LED s on poara t connects to any standard monitor AUX or video input on a VCR or through a AS LOW AS 5 25 ea blade nib vp dea PRICE EACH video modulator to a TV Works with a REGULATED 12V power CATNO DESCRIPTION l 10 25 supply 1 1V 13V Hooks up by connectiong three wires redto RH60 1 1 ib Spool 031 60 40 6 90 5 96 5 30 12V black to ground power amp video and brown to video RH63 1 1 ib Spool 031 63 37 695 610 5 4 signal output RH60 4 4 4 Ib Spool 031 60 40 24 00 21 90 17 92 Power Supply Regulating Kit for CA H34 This simple RH60 TUBE_6 0z Tube 031 60 40 99 89 79 kit is designed to fit onto the back of the CA H34 CCD PRICE EACH camera it resolves the problem of hooking up the camera to CAT NO DESCRIPTION 5 an UNREGULATED supply which damages the camera by me H34A PCB Mounted IRCCD Camera 00 00 85 00 providingsaferegulated power from any 12V 14V DC supply Power Supply Regulating Kit 6 95 CIRCUIT SPECIALISTS INC SINCE 1971 800 811 5203 602 464 2485 602 464 5834 0AX WE ACCEPT SEE OUR ON LINE CATALOG AT http www cir com It also provides regulated 12V DC from a 12V AC source RECEIVE OUR LATEST 132 PAGE CATALOG It s chock full of all types of electronic equipment jag and supplies We ve got 1 C s capacitors resistors pots inductors test equipment breadboard ing supplies PC supplies industrial computers data a
48. a free functional Trax Maker demo are available on the Internet at http www microcode com on CompuServe GO MICROCODE and on America Online by doing a file search for Trax Maker am EA MicroCode Engineering inc 573 West 1830 North Suite 4 Orem UT 84057 2030 USA Phone 801 226 4470 Fax 801 226 6532 Internet http www microcode com CIRCLE 171 ON FREE INFORMATION CARD a s o SO At _ e EARN YOUR COMPUTERS a Sea A By Studying at Home Grantham College of Engineering now in our 46th year is highly experi enced in distance education teaching by correspondence through printed materials computer materials fax modem and phone No commuting to class Study at your own pace while continuing on your present job Learn from easy to understand but complete and thorough lesson materials with additional help from our instructors Grantham offers three separate distance education programs leading to the follow ing accredited degrees 1 The B S E T with Major Emphasis in Electronics 2 The B S E T with Major Emphasis in Computers 3 The B S C S the Bachelor of Sci ence in Computer Science An important part of being pre pared to move up is holding the right college degree and the absolutely neces sary part is knowing your field Grantham can help you both ways to v learn more and to earn your degree in the process Write or phone for our free ca
49. a possible fire hazard And because m Genuine ceramic they don t have a thermostat you heating element must constantly turn them on and 70 oscillation off to stay comfortable Designed to fit in any en vironment The RST 1i200 is very cOmpact measuring a WE Solid state electronic mere 13 tall and weighing just The RST 1200 on the other hand thermostat ons under two and a half pounds utilizes a genuine ceramic heating Automatic tip over With a diameter of 8 3 you can element Ceramic elements are and overheat protect on put the RST 1200 virtually any known to be a very efficient and ef High velocity fan fective heating method Ceramic heaters do not burn air therefore they do not cause any odors or pro Even more important is the fact that ihe RST 1200 does not get hot to the touch that means it is not a fire hazard Control your climate The RST 1200 has an electronic thermostat that lets you choose your own comfort level Simply set the dial to the appropriate temperature and the RST 1200 will automatically maintain that comfort level It provides even uniform heat without irritat ing hot cold cycles Spread warmth throughout a room One of the best features about this amazing new heater is its oscillatton the RST 1200 oscillates over a range of 70 A high velocity fan disperses the intense warmth produced by the ceramic heat ing element resulting in even distrib
50. aie iy i LU iy ae Speakers in the World roan had the pleasure of test ing or listening to what I think are the best PC speakers in the world Of course they re magnetically shielded but they re also small and sound great But just saying that alone does not do this speaker system any justice at all because you really have to see the system and then hear it to under stand what I m saying I m talking about the Bose Acoustimass Multimedia Speaker System no power adapter it s built into the bass module Each platinum colored driver con tains a specially designed 2 1 5 inch wide range transducer The little cube drivers measure only 3 x 3 x 5 inches and weigh 1 1 pounds each They re so small that they can actually get lost in desktop paperwork as opposed to other speakers I ve tested that can dwarf a 20 inch monitor The bass module measures 7 1 X 18 15 X 8 1 5 The Bose Acoustimass Multimedia Speaker System is the best sounding multimedia speaker system lve ever heard When unpacked the system from its carton thought the left and right drivers were missing Filling the major ity of the box was the bass module Then pulled out a small cardboard box that thought contained a power adapter But then found another iden tical small cardboard box and won dered why there would be two power adapters Upon opening one of the boxes found one driver and then another in the other They wer
51. can find it when we re packing we now have a single highly portable place to keep our travel itinerary appointment schedule and important phone numbers when we go to conferences or trade shows POWER PLAY Continued from page 28 graphics are excellent the controls are easy to handle movements are quick and accurate The PlayStation s three dimension ality was not quite up to Nintendo 64 standards however While a marked im provement over fiat 16 bit games you didn t get the same sense of falling into another world that was afforded by Super Mario 64 On the plus side however with at least 150 titles to be available for the 1996 holiday season you won t get bored anywhere in the near future Read on for an in depth look at the game we spent much more time playing than we should have Crash Bandicoot and some capsule reviews of several more new titles for the Sony PlayStation All of the games reviewed are available from Sony Computer Entertainment America at sug gested retail prices ranging from about 50 60 So1u0sj9a 9 UeiNdoY Z664 Yasew Go we March 1997 Popular Electronics 34 VCR Cross Reference NOW Find the right Part for your VCR pith Editio ISCET VCR CROSS REFERENCE This 119 page reference contains both model and part number cross references updated to include 1994 units With the VCR s are made in a few factories from which hundreds
52. can get large amounts of reverse current to flow but you have to apply a very large poten tial to break the diode s spirit The volt age at which this breakdown occurs is called the reverse breakdown or peak inverse voltage of the diode iC3 a V R1 IC1 a C1 1 a BY JOHN J YACONO TECHNICAL EDITOR WINDOWS MAGAZINE and varies from design to design But that s enough theory let s check out what s ringing THE COMPLETE SMART BUTTON CIRCUIT wanted a circuit could add to my doorbell system to unlock the door after the right number of button press es occurred in a specific amount of time My first concept is shown as a block diagram in Fig 2 The doorbell pushbutton S1 is debounced by R1 C1 and C1 a Integrated circuit 1C4 counts the closures of S1 until a pause causes C4 to reset at the trailing edge of the IC3 a pulse Integrated circuit IC5 a triggers on the trailing edge of the C3 a pulse and IC5 b triggers on the trailing edge of the pre selected count output of IC4 which coincides with reset The outputs of IC5 a and IC5 b are then gated by an AND anda xOR gate If both IC5 a and IC5 b out put pulses are present at IC6 a then an accuracy pulse will appear but there will be no error pulse from 1C7 a If only one pulse is present at the inputs of IC6 a and IC7 a then there will be no accuracy pulse output from IC6 a but there will be an err
53. controlled by plug in crystals That was before programmables came into existence Apparently there are still loads of ancient crystal con trolled scanners floating around out there at least that s what my mail lets me know several times per month The problem seems to be that nobody knows where to obtain the crystals that those scanners require in order to install new frequencies We have looked around for crystal sources but couldn t find any If there are any places that can supply crystals for RadioShack Realistic Regency Sonar and similar vintage scanners please let us know about them We will run that information here and make many people very happy We are always interested in hearing from you with information questions new frequencies suggestions and whatever If it relates to VHF UHF mon itoring or scanning then our readers want to know Feel free to write to Scanner Scene Popular Electronics 500 Bi County Blvd Farmingdale NY 11735 ey Bands You ve Never Used am radio operators use the medium wave MW shortwave HF very high frequency VHF and ultra high frequency UHF bands for communication Most of us think that the lowest band for ham communica tions is 160 meters 1 8 MHz band In the USA that s true for the official ham bands But there are other transmitting opportunities available in the low fre quency LF and very low frequency VLF bands below the AM broadcast b
54. counts from one to six and then repeats over and over as long as puls es are received from IC1 A 4511B BCD to seven segment latch and driver IC3 supplies drive ig th PARTS LIST FOR THE STEPPER AND D DRIVER Fig 6 SEMICONDUCTORS _ 3 C1401 1 quad two input NANO gate inte arated ero IC2 4017 decade counteridivider inte grated circuit oo Ie a5t 1B 7 segment faich and driver Integrated circuit DISP1 7 segment display common g cathode 3 D1 Do IN914 silicon diode ADDITIONAL PARTS AND MATERIALS sera RAT A6 100 000 ohm ywan 5 resistor _ R7 R13 680 0hm Va watt 5 resistor GLC t u ceramic dise naa S1 SPDT switch Wire solder ete eS R1 14 i 100K 3 A in ai 1 4 4011 R2 100K 1 p ol oA IC1 b 1 4 4011 7 gt 12V DISP1 RESULTING ISPLAY R13 6800 RESULTING SISPLAY Fig 6 This sequential stepper and driver A uses a seven segment LED display DISP1 to show the step position Follow the truth table B for input data current for DISP1 The 4017 s 1 to 6 decimal output count is converted through a diode matrix to a BCD for mat to input the 4511B Resistors R7 R13 limit current for the display The 4511B s truth table is shown in Fig 6B For example to produce a 0 reading all four of the 4511B s BCD inputs must be low To find out what all of the other display readings are you just have to follow the
55. databases to pro vide the information Of the several that we have seen the one we liked best was Spectrum which covers more than three million FCC listings in the United States You can run the mouse operated program through Windows 3 1 or higher Win dows 95 or NT DOS and Mac Sys tem 7 or higher What type of hardware is required A PC with at least a 386 microprocessor with a VGA monitor for Windows CGA for DOS is suggested You ll need at least 4 megabytes MB of space on the hard disk and another 4 MB of RAM Mac owners should have color monitors with 16 color capabili ties and will also need 4 MB free on the hard disk plus 4 MB of RAM You re going to find pretty much everything licensed by the FCC on the Spectrum CD ROM It includes listings for public safety agencies business radio broadcasters coastal stations experimentals microwave and more There aren t any hams or listings for specific maritime mobile or aircraft sta tions And of course no federal sta tions because the FCC doesn t license federal stations The CD ROM offers FCC data searches by licensee name call letters county operating frequency frequency range FCC Radio Service Code or class type of station Each listing pro vides call letters frequency licensee name class and type of station city and county of the transmitter and lati tude and longitude as well as the num ber of land air marine portable and pagers au
56. discounts 30 day free trial Competitive prices Cali now 1 800 322 0921 REGAL SALE INC CABLE TV descrambiers Ofe piece unis Fr ee tae tag teed guaran tee Houston TX 713 651 4610 v CABLE test chips Jerrold Pioneer Tocom Sci entific Atianta Zenith Jerrold cubes Pioneer pro grammable cubes HUDSON 1 800 863 3237 CABLE TV notch filters Request our free bro chure by calling our voicemail at 1 800 433 6319 or write to STAR CIRCUITS PO Box 94917 Las Vegas NV 89193 Visit our web site at nttp our world compuserve com homepages starcircuits Brusly LA 70719 START saving your money Buy your own cable box All makes and models available F TG RFI Dealers welcome Call 619 633 8205 Your call will be returned within five minutes ZENITH compatible test chips activates full test mode All except PZ1 24 95 REALVIEW 888 732 5843 Visa MC Cod FREE cable descrambler plans For details write SIERRA PUBLISHING 909 E Yorba Lin ga Pra Suite H 181 Dept PEC Placentia CA 70 COMPONENTS RESISTORS 20 for 1 00 LEDS 4 for 1 00 Cata i L Posen ae Box 12238 Lexington KY 1 AUDIO VIDEO LASERS LASER projectors complete professional sys tems starting at 695 00 BeamScan by R LINE LASER PRODUCTS 314 831 3014 o s SATELLITE EQUIPMENT VIDEOCYPHER II descrambling manual Sche matics video and audio ExplainsDES EPROM CloneMaste
57. elt S86 e 8 fe oy t fares Those pp fore news a om across Ren nation awi i e he USA Today s site Noi he ihe running sports Scores at the top of the page might not want to deal with local cov erage that s not from your locality If that s the case you should point your browser to the online version of another well known newspaper USA Today The free site is instantly accessible there s no registration of any kind required Once you load up the site you re met by a full color attractive page Actually attractive is a key word when describing the online version of this paper USA Today is famous for its good looking graphics and online lo Netscape USA TODAY Weather ntp www usatodey com weether wtront htm a The basics Hurricanes Temadpsa bi pa 5 iC na TEN 120696 Updated 05 34 AM ET Ww vesther sale safety 22 A good example of l USA Today S HET can a aii in Pohe Weather section te the paper s Site Front page News Sports binney Life Y cather Tere S ALEL they re all present Those who appreci ate charts graphs and illustrations will love navigating through this very col orful site Using colored buttons to the right of the paper s logo the page lets you choose from News Sports Money Life or Weather None of which need any explanation You can also pick from specific sections of each such as Top News Scores Stocks Travel and Lot
58. 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 Polymer resin treated paper cone with poly foam surround Long throw voice coil design helps to deliver powerful bass output Per fect for bookshelf type speakers Mf C16L020 51F Power handling 6 watts RMS 120 watts max Voice coil diameter 1 1 4 inches Impedance 8 ohms Frequency re sponse 57 7000 Hz PO 290 023 ccccccsesccccccsssccosoorseseerooees m PO 275 050 me O N WP 30 day money back guarantee 20 00 minimum order We accept Mastercard Visa Discover and company C O D orders 24 hour shipping Shipping charge UPS chart rate 1 90 5 00 minimum charge Hours 8 00 am 8 00 pm ET Monday Friday 9 00 am 5 00 pm Saturday Mail order customers please call for shipping estimate on orders exceeding 5 lbs Foreign destination customers please send 5 00 U S funds for catalog Quantity pricing available CIRCLE 146 ON FREE INFORMATION CARD S91U01 28 3 1ENdOd Z664 YEW G March 1997 Popular Electronics wo T LCD Display Baien for Dis plays up to 40x2 not inc Two AUX outputs for Relay amp Light Combine 16 per RS 232 line or w other devices NCD LCD Kit 34 Asm 44 Includes Driver Software in QBasic for PC users National Control Devices Contact Ryan Sheldon Phone 404 244 2432 FAX 417 646 8302
59. forget that not everyone has been there and done that and that s one reason for pre senting the next circuit The LM741 op amp is probably older than many of our readers but for those who have not played around with this versatile semiconductor yet here s a very sim ple and useful circuit application to start with A single supply LM741 inverting AC amplifier circuit is shown in Fig 4A This circuit may be added to just about any existing project for additional gain where needed The circuit s input impedance is equal to the value of input resistor R3 and the output impedance is somewhere around 100 ohms The amplifier s gain is equal to R4 divided by R3 A table in Fig 4B shows several resistor values for R3 and R4 that you ll need to obtain for gain fig ures of 1 to 500 V SEE TEXT Fig 5 This latching circuit can be used as an a switch with a K aA pants ST Fon THe MEMORY POWER o SCR 1 s0 volt t ampere silicon con j Solod rectinor or select tgs for denied oo ted es Ri 1000 chm tg watt 554 resistor RS 10 000 ohm ewa 5 resistor 3 2 Pushbution switch normaly i LASERS MEMORY POWER SWITCH Our next entry see Fig 5 uses an SCR in a latching circuit This can be added to a DC operated circuit as a type of on off switch that actually has a memory Pressing S1 momentarily supplies current to the SCR s gate thereby turning it on and supplying p
60. in our home of fice which sad to say resembles a teen ager s room It s filled with books and boxes tapes and CDs Joysticks computer gear magazines everything but empty pizza boxes and soda cans we had to draw the line somewhere With not a single empty desktop we ended up placing the GXTV on top of a computer monitor box on the floor Then we sat ourselves down cross legged in front of it if you have teenagers in the family you know the posi tion and proceeded to play Super Mario 64 for a few hours We were glad to learn that the GXTV features a low emissions CRT its X radia tion of 0 01 mR H is significantly lower than most 13 inch TVs making close up viewing safer We were also happy to hear that the CRT resists image burn in which can be caused by leaving a game in the pause mode for an extended period of time The tilt stand allowed us to slant the TV down for a comfortable angle of view It was easy to swing the speakers to the prop er angle for our listening position We could easily picture our teenaged selves parked on the floor talking on the phone thumbing through magazines watching music videos And we could easily have stayed there making Mario run jump cli mb and swim for the whole night if only our not quite middle aged selves didn t get so stiff after a couple of hours on the floor LISTENING TO THE WORLD Continued from page 32 speaker is surprisingly adequate for much
61. is a CMOS de vice if can be easily damaged by static electricity Take proper anti stat ic precautions when handling the Chip Refer again to Fig 3 before in stalling IC1 to make sure of the proper orientation of Pin 1 then press the IC firmly into the 28 pin socket Repeat the procedure with IC2 and C3 Operation If you are using the 81256 memory IC 256K for IC2 install a shorting jumper block on header H1 Otherwise if you used a 4164 memory IC 64k for IC2 then leave H1 open Continued on page 51 So1UOIIOa WeINdOY 7661 yoseyy J J March 1997 Popular Electronics amp a ee eliular phones are no longer g just for the rich and famous They can provide motorists peace of mind with instantaneous communications in case of an acci dent breakdown or medical emer gency Most cellular phone compa nies have special for emergency only services typically costing 15 to 25 monthly Today approximately 10 of the estimated 260 000 daily calls to 911 in the U S originate from cellular phones The number is ex pected to grow dramatically as tens of thousands of new cellular phones are installed in the U S daily Car phones and radio frequency communications are the starting point for systems that can not only send out an SOS but which can also pinpoint the vehicles precise location so help can be dispatched rapidly Stolen cars can now be tracked so they can be recovered sometimes in
62. it will stop for about three seconds Scanning will continue un less one of the tuning buttons is pressed When the top of a band is reached the scanning will resume at the bottom of the band One of the high tech features that makes the ICF SW1000T special is a syn chronous detector Signal fading is a big problem in shortwave reception Syn chronous detection reduces the problem by replacing the carrier of the received signal with a perfectly synchronized sta ble carrier generated by the receiver itself Another problem that plagues short wave reception is interference from adja cent stations However the synchronous detector circuit locks onto only the upper or lower sideband USB or LSB of the station So if the frequency of an interfer ing adjacent station is higher in frequency you would want to lock on to the lower sideband Conversely if the interfering station was lower in frequency you would want to lock on to the higher sideband The receiver s USB and LSB CW modes allow single sideband and continu ous wave Morse code signals to be re ceived Single sideband and CW transmissions are commonly used by ama teur radio operators hams The ICF SWIOOOT s tiny front panel Continued on page 34 Organizer Fit for a King ROYAL FLASHLINK 95 FL95 PC OR GANIZER Manufactured by Olivetti Of fice USA Royal Consumer Business Products 765 U S Highway 202N Bridgewater NJ 08807 0945 Tel 908 526 8200
63. joints and adjust the position of the con nector Then solder the remaining pins of the DB 25 Using the plastic shell half con taining the LED hole as a guide install the LED on the solder side of the board Be sure to get the polarity cor rect We stress this because the in stallation of C2 later will make desoldering of the LED difficult Install C1 C2 C3 X1 RO R13 R14 and R16 on the solder side of the board as well Leave about 1 mm of extra lead length on C1 C3 and bend these parts down flat against the board in the direction away from the crystal Install all remaining parts on the component side of the board Be sure that all parts especially Q1 Q3 and IC3 are flush against the board Test the circuit before installing the plastic shell the shell is difficult to take apart Checkout and Adjustment To power up and test the circuit it is nec essary to have either the AccuPage Radio Monitor program for the PC mentioned earlier or a test program that sets the COM port as follows RTS 0 DTR 0 for at least 0 1 sec fol lowed by RTS 1 DTR 0 indefinitely This resets IC1 then configures the lines to provide power Start with the device connected to the COM port but nothing connected to J4 or J2 Measure the voltage relative to cir cuit ground at IC1 pin 14 and IC2 pin 11 these should be 5 volts and 6 to 11 volts respectively The LED should not be lit Next tune your scanner to an active pagi
64. listed Large quantity available BILATERAL TRIGGER DIAC cassettes Used for a short 4 FOR 00 CAT DB 3 28 36 volt vy Contains a5 Vde adjusted or removed 0 1 thick clear plexi amp 12 vdc switching glass case Maximum case size behind 4 cable with miniature 4 pin mini fo A DIN plugs on both ends ey CAT CB 363 time then bulk erased Pe each orver tou rree 1 800 826 5432 MAIL ORDERS TO FAX 818 781 2653 INFO 818 904 0524 pve ALL a Ech tacer CORR INTERNET http www allcorp com VAN NUYS CA 91408 0567 E MAIL allcorp allcorp com ea Delivered in the State of California must include California State Sales Tax NO C O D Shipping and Handling 5 00 for the 48 Continental United States ALL OTHERS Including Alaska Hawaii P R and Canada Must Pay Full Shipping Quantities Limited Prices Subject to change without notice NO MINIMUM ORDER All Orders Can Be Charged to Visa Mastercard American Express or Discover Checks and Money Orders Accepted by Mail Orders co MANUFAC We Purchase EXCESS INVENTORIES Call Write E MAIL or Fax YOUR LIST CIRCLE 28 ON FREE INFORMATION CARD ELECTRONIC KITS TOLL FREE ORDER LINE 1 800 336 7389 h 1 474 VOICE CHANGERS TEGH SUPPORT NUMBER 1 602 894 0992 AND MORE XANDI ELECTRONICS INC PRICES SUBJECT TO CHANGE WITHOUT NOTICE i MANUFACTURER OF HIGH QUALITY KITS li XTR300EZ XT
65. listening FM stereo broadcasts are re ceived in stereo through the headphone jack The audio quality is pleasant enough for casual listening It is however lacking in bass output No tone controls are avail able for FM broadcasts but a NEWS MUSIC tone control is provided for the radio s AM reception The built in telescopic whip antenna performs well for casual listening as does the built in loopstick antenna for AM band and long wave reception For better results on the shortwave bands a clip on antenna is provided with the receiver so you can string it across the room and great ly increase the power of the receiver When you re finished listening the antenna winds up into a compact case An external antenna jack is also provided However the jack is primarily intended to be used with a compatible active antenna 3 volts for powering the active antenna is always present on the jack Power for the receiver portion is pro vided by two AA batteries A separate AA battery provides power for the cassette deck An optional wall mount adapter is available as well The ICF SW 1000T is a very good shortwave receiver and a very good cas sette recorder crammed into a rather small package Its main problem is that it s somewhat expensive Otherwise it has sornething for everyone and a lot for any one who really loves radio a eS idust Training Independent study from CIE will give education at CIE matches or you
66. lot of fun but teach ing one to talk can also take a lot of time With this easy to build circuit you can have all the fun of an accurate mimic in about an evening Best of all there s no cage to clean David Williams aa Cas rE an LF i A N oe 7 52 Build an AC Line Voltage Monitor ar gree eel oa ieee TA Just how safe are your expensive electronic devices Find out if the E e oe ree AC outlets in your home or workshop are producing clean elec al ell 7 a Tyni nm tricity with this inexpensive circuit Marc Spiwak FEATURES 48 Cars That Can Call for Help Learn how electronics can help roadside assistance get to you even if you re lost Also find out what new technology makes it easy for police to get your stolen vehicle back Bill Siuru 58 Intelligent Micromachines Microscopic motors and machines have been around for a few years however now they can think for themselves Join us for a look at the marriage of microminiature processors and motors that could result in some amazing applications Douglas Page Page 58 POPULAR ELECTROMICS ISSN 42 17 G x Piibstished monthly by Gernsback Publications fg S00 Bi County Beulaverd Farmingdale NY 1735 3 Periodicals postage paid at Formingdala HY and at additional mailing offices One year twelve imes subscription rote US asd possessions 2195 Tanada 76 84 inckides Cat i Comedian Goods and Servicos Tak Registration No RI2Z5146280 oll other lt
67. microcode com on CompuServe GO MICROCODE and on America Online by doing a file search for CircuitMaker Call now to order or request additional information 800 419 4242 amp VISA MicroCode Engineering Inc 573 W 1830 N Suite 4 Orem UT 84057 2030 USA Phone 801 226 4470 Fax 801 226 6532 e Internet CIRCLE 157 ON FREE INFORMATION CARD en ps e Reaction Tune with your AOR AR2700 The Scout with its revolutionary Reaction Tune feature can tune the AOR Model AR2700 to the frequency it captures in less than one second No more scanning through an entire band of frequencies hoping to find that one elusive unknown signal The Scout will lock onto and capture into memory all nearfield frequencies up to 400 while simultaneously tuning the AR2700 to the recorded frequency Take it along to a Sporting event amusement park shopping mall or downtown and start building your own frequency database See below for list of other compatible Scout Reaction Tune receivers Automatically tunes the AR2700 to the frequency captured kel Takes guess work out of scanning for active frequencies kl Records and saves up to 400 frequencies in memory kal Records up to 255 hits on each frequency in memory a Interface to a PC for frequency download using the optional Optolinx PC Interface head Distinctive beeps indicate frequency hits pager style vibrator for discreet recording he Automatic EL backlight for nigh
68. of different brand names and model numbers identify cosmetically changed iden tical and near identical manufactured units Interchangeable parts are very common An exact replacement part may be available only a few minutes away from you even though the manufacturer Supplier is out of stock You may be able to cannibalize scrap units at no cost The ISCET VCR Cross Reference iS pre punched for standard loose leaf binding 38 00 plus 3 00 for shipping for each Reference Claggk Inc VCR CROSS REFERENCE OFFER P O Box 4099 Farmingdale New York 11735 0793 i Name i Business i Address Ciy i Phone l Enclose 38 00 tor the Fifth Edition ot the ISCE VCR Cross Reference and 3 00 for shipping tor each Reference The total amount of my order is l Check enclosed do not send cash or please charge my credit card O MasterCard L Visa Exp Date _ Card No Signature New York State residents must add applicable local sales tax to total US funds only Use US bank check CB02 or International Money Order ADVENTURE DOWN UNDER Continued from page 28 The PlayStation s standard controller however doesn t provide the same range of movement as Nintendo 64 s with its analog joystick The only way to regulate Crash s speed is to tap the forward button as opposed to holding it down The op tional PlayStation joystick which does provide 360 movement will
69. output of IC6 c with a pulse derived from the charging of C6 TO UPSTAIRS DOORBELL eee a C R2 4 7 8 2K R3 R1 py 50K 12 Di SENSITIVITY 2 WATT 1N5817 D2 Q 1N914 2N3904 R10 390K OFF S1 D3 1N4001 BASEMENT gt BELL C8 330 TO TRANSFORMER 16 VAC Q1 a 2N3904 C3 4 o 10K R12 2 MEG R13 560K C 1 TANTALUM R3 Re 10K R5 10K R7 220K 340K Fig 5 Hear your doorbell in the basement with this circuit To achieve an accuracy pulse you must push S1 at least 3 times per sec ond for the pre selected number of times If you push too many times or if you push too few times or if you push too slowly then an error pulse will trig ger IC3 b and you must wait about 4 seconds before trying again Light emitting diodes LED1 LED3 could be mounted either on the circuit board or on a panel and in either case used for practice Resistors R9 R11 and R12 should be about 220 ohms for 5VDC 390 ohms for T1 DOORBELL e pa HERE 117VAC 6 SCO BELL PUSHBUTTON 1 1 D1 AUDIO TRANSFORMER 1MN4003 a F T1 Fig 6 This circuit enables you to ring additional door bells in adjacent areas such as basements work shops or garages OUTPUT TERMINALS HOUSEHOLD BELL TRANSFORMER 10 16 VOLTS 117VAC 4 INACCESSIBLE PARTS OF WIRING FRONT BUTTON J i RADIOSHAC
70. over the telephone line Prevent eavesdropping from an extension or tap Connects between your telephone and wall jack No modifications are required to your telephone Full duplex operation 43 00 Technologies PO Box 421 Batavia OH 45103 Connects between a TW523 and an RS 232 serial port Use your PC Mac program to control your home ti Dsl string Create your own ut program to log the name number date and time of all incoming calls Bloc lt out unwanted callers to your BBS modem 34 50 other 8 Caller ID RS 232 Consects between a telephone wall ack and an RS 232 serial port des the caller iD data sent over a hone line and sends it to your ac in a pre formatted ASCII IR Remote Control Receiver 4 Learms and records the data patterns i emittad by standard infrared controls used by TVs VCRs Stereos etc Lets you control all your electronic projects with your TV remote Seven individual I O pins zan be assigned to any button on your remote and can be configured for either toggie or momentary action 32 00 remote weedtech iglou com Telephone Call Restrictor Connects to telephone wall jack Disables all phones on the line if attempting to either dial a number that has been stored in memory Block mode or dial a number that has not been stored in memory Allow mode Use touch tone phone to enter telephone numbers into memory and c
71. poets ae se se a TT Flasher Zapper Audio RF Radar Jammer Plant Stim Kirlian Ozone Gen much more i MANUAL advantages over and uses with cellphones Forwarding Conferencing Phreak Hista Net fraud rakes in 2 Billion p Described in detail includes countermeasures 6 Of On u A WN i The Net is infected with spammers stalkers Fax Orders 505 434 0234 3 them down in this comprehensive manual Postal M O is best VISA MCOK CODadd se WYPWea T1743 3 Sold for educational purposes only PAT HARDWARE Physical Reg E cipher PEN compromise ing inside job super cool Much more uWave Radar Ultrasonic IR Light INEL labeled internal photos figures tat Radionics EM eden E OUNT Detector Blaster Phone Color Boxes wee Describes in detail how T y en TENS Subliminal Mixer Amp Ultra mented Dozens of computer crime and tex Generator 6th Sense Communica and utilities and the legendary FLUSHOT PRREAKING CALLER ID amp ANI S249 Call Blocking amp 67 Describes Caller Diverters Extenders Centrex much more ow answering machines are hacked to lis HIGH VOLTAGE 29 Cellphone Mods customers we will per EVICES fax include a 10 SASE Fence Charger Plasma amp Van de Graaff Gens Describes in detail how Pagers BEYOND PHONE COLOR BOXES and p and tricks And how Pagers are Diveriers Extenders Loops REMOBI ON Wy annually Most are done anony P O Drawer 537 Alamogordo NM 88311 N T E
72. precisely contro Mario s mo tions and his speed As he moves his shadow follows him You can also see the shadows of such perils as bouncing balls and try to zet Mario out of their way before they strike him As he moves in 360 de gree turns his world changes to reflect the changing perspective Objects are hidden behind walls or revealed as he travels around The result is incredibly realistic and incredibly addictive game play Every one who saw Super Mario 64 was im mediately impressed by what a big step forward it was from the old two dimen sional version and quickly drawn into play There might not be many games yet available for Nintendo 64 but as far as we re concemed in Super Mario 64 Nintendo has found a killer app Judging by preliminary retailer reports holiday shoppers agree N64 and its three avail able games are the big sellers so far this season set top box At its heart is a 33 MHz 32 bit RISC CPU that offers a 4 KB instruc tion cache and a I KB data cache The CPU is backed up by a graphics processor GPU that provides a maximum of 16 770 000 colors and 640 x 480 dot resolution The CPU also handles the tex ture mapping used in creating 3D games In terms of audio the PlayStation delivers CD quality sound and can be used to play audio CDs as well as games The sound processor can also add built in dig ital effects such as reverb and envelop What that all com
73. reason are even used by law enforcement agencies With such high tech help the good guys in blue can keep tabs on the dealings of known nefarious charac ters How Pages are Transmitted Paging channels can be found scat tered around the VHF 152 MHz and UHF 454 MHz bands In most metro politan areas a large number of pag ing channels can be found within the dedicated paging banc from 929 to 932 MHz To discover the frequency used by a specific paging service just look at one of their pagers There will almost always be a sticker indicating on es eae the reception frequency Pager signals of the type we are interested in here are modulated by the direct FSK method This means that the RF carrier is switched be tween center frequency 4 5 kHz and center frequency 4 5 kHz to represent binary 1 and 0 respec tively Bit rates currently range from 300 to 2400 bits per second The most commonly used data for mat is POCSAG Post Office Code Standard Advisory Group This coding standard was devised in a series of meetings of industry representatives hosted by British Telecom in 1978 cnd 1980 POCSAG is a 32 bits per word synchronous error correcting code using a 17 word frame It is broadcast at 512 1200 and 2400 bits per sec ond On most paging channels you will hear the signal switching rapidly between different bit rates as various pagers are addressed To learn to rec cgnize POCSAG
74. selected English broad casts from some of these ex Soviet SWers This data has been collected by DXer Kevin Hecht who invites SWLs to submit additions and cor rections to his e mail address khecht 19 mail idt new Radio Ukraine International broad casts to eastern North America and Europe at 0000 UTC on 5 905 5 915 6 010 6 080 7 150 9 550 9 560 and 9 735 kHz and to the rest of North America at 0300 UTC on 7 150 and 9 550 kHz Radiostantsiya Belarus has English on Tuesdays from 1845 to 1900 UTC on 7 210 and 11 960 kHz and via Ukrain ian transmitters 7 180 and 9 875 kHz Radio Vilnius Lithuania has English at 0030 UTC relayed by a 100 kilowatt German transmitter on 9 560 KHz Radio Dniester International sup posedly transmitted from Pridnestrovye a separatist territory of Moldova has English programming on a sporadic basics from 2030 UTC on 11 750 kHz Uzbekistan s Radio Tashkent is reported from 0100 to 0130 UTC on 6 160 7 190 and 9 715 kHz and from 1200 to 1230 and 1330 to 1400 UTC on 7 190 9 715 and 15 295 kHz Voice of Armenia is on the air Monday through Friday at 1745 UTC on 4 810 4 990 7 480 and 9 965 kHz It also is scheduled daily at 2030 on 9 965 11 615 and 11 665 kHz Radio Almaty in Kazakhstan is on 6 230 kHz from 0030 to 0100 UTC and via a Ukranian transmitter 0530 to 0100 UTC on 11 705 kHz INSIDE THE VOA Skip Arey host of the Listener s Library column in The Journal of the
75. shadows and reflections are thrown in You can choose your on screen character from among six watch replays of your landings or even take aerial snapshots Fly your rocket pack to the top of Seattle s Space Needle and rest a bit if you like Interestingly the game was designed with the help of a team of programmers from Paradigm Simulation which has a reputation for producing some of the best military and commercial 3D flight sim ulators PilotWings 64 should earn them a similar reputation in the gaming world I Plumbing The Depths SUPER MARIO 64 Manufactured by Nintendo of America Inc 4820 150th Avenue N E Redmond WA 98052 Tel 206 882 2040 Suggested retail price 59 95 As the latest incarnation of Super Mario roams the castle in search of a princess who needs rescuing he encounters large paintings hanging in various rooms Nudge the 3D stick forward press the blue JUMP button and Mario vaults into the picture like Alice through the looking glass And that s a bit what you feel like too as you leave this world behind and fall into Super Mario 64 The one player game features elements familiar to fans of earlier versions of Super Mario coins stars power ups puzzles and mazes hidden treasures and his old nemesis Bowser But the new Mario is a fully three dimensional figure created from hundreds of texture mapped poly gons At the closest camera zoom Mario consists of 1500 polygons And Mario
76. stabi z i with a i Hi elimi 17 tall amplified FM abie E ee the antenna Improves TV S l reception with weak FM t y jA paat ng signals 18 dB of gain verter or ie r N includes AC adaptor 7 cabis UEU a agy omits guln control and 75 s ready VCR this a videotapes This ohm coaxial cable ee handy device allows you to unit is fully automatic terminated with an P feed the cable TV stereo signat into your and operates on one 9V connector home sound soem for superb audio reproduction of battery which is included your tavorite shows movies and sporting events PO 219 055 ennseesssse PO 189 110 PO 180 320 0 001 000 These 1 3 CCD cameras offer a clever means of disguise Both feature a 3 6mm wide angle iens built in electronic shutter and a 12 VDC power supply Minimum i llumination 0 3 lux 400 line resolution Smoke detector The Sound Bridge is a decoy camera includes an audio output mini FM wireless transmitter that can be used to broadcast stereo sound from any audio source like portabie CD piayers TVs electronic games CD ROM even computer soundcards to your home stereo receiver Adjustable from 89 to 95 5 MHz Microphone Camera Lens ay Part Description Price PO 335 535 Smoke detector decoy 249 50 PO 335 540 Decoy clock camera 299 95 Don t throw away m Deluxe probe kit i expensive CDs features a modutar y A S because of an design for longer ww noy
77. that In terms of wavelength 200 meters and down is the HF shortwaves which is really great for getting out of your backyard It seems that radio experts of the late teens and early twenties had not heard of ionospheric propagation S91U01 98 3 seindog Z664 yoley March 1997 Popular Electronics J2 Ji RF OUT VLF LF TO INPUT P RCVR T17 C3 47 C1 XTAL1 47pF q C2 3 5 MHz OR amp a 240pF 4 0 MHz y 9 12VDC i a C7 10 SEE TEXT Fig 2 Here s a simple VLF LF to HF converter circuit that you can build LF VLF TO HF CONVERTER PROJECT Many ham radio receivers today are also general coverage receivers even when part of a ham bands only trans ceiver It is not uncommon to find ama teur radio receivers that go down to 100 kHz or even 30 kHz But many receivers do not cover such low fre quencies And some of them that do cover LF VLF frequencies are not all that wonderful at those frequencies Sensitivity seems pukey at best for many models You can however build a converter that will translate the LF VLF frequencies to either 3 5 to 4 MHz or 4 to 4 5 MHz Figure 2 shows a sample LF VLF to HF converter circuit you can build This converter is based on the NE 602 chip IC1 It contains the circuitry necessary to make the front end of a superheterodyne receiver It contains an oscillator that can be operated from very low frequencies up to about 200 MHz It also contains a
78. that those old adages You can t please all of the people all of the time and You can t be all things to all people have been passed down through the generations Sony s ICF SWIOOOT however comes close It will surely please a lot of people most of the time And it has something for just about everyone Ham radio operators will like it though they probably won t use it when making contacts or QSOs Shortwave lis teners will love it even though they might have a dedicated desktop receiver that they prefer for catching the toughest DX stations Travelers will want to take it along even though they might have more miniaturized receivers available to them Rush Limbaugh listeners will love it as will listeners to NPR s All Things Con sidered Even casual listeners will come to appreciate the ICF SW1000T which can open up a whole new world of radio for them Why should the ICF SW1000T be a fa vorite of so many people It s not only a general coverage receiver although its coverage does start at 150 kHz below the AM broadcast band and extend up to 30 MHz It also covers the FM band in fact its FM coverage starts at 76 MHz the bottom of Japan s FM band It s portable measuring just 7 X 44 X 1 inches And it is also a Cassette recorder it just happens to be the smallest combination shortwave receiver and recorder on the market The recorder is a great feature for short wave l
79. the power source and is fully charged switching S1 to the other position takes the capacitor s positive lead to ground and its negative lead to the output terminal The negative supply may be used as a low current bias source Or if you 2a 1 WO lt SEE TEXT BY CHARLES D RAKES were to add a larger value capacitor the circuit could in a pinch operate as the negative supply for an op amp circuit if a larger capacitor is used though add a low value resistor in series with one input lead to protect the switch from arcing during the initial charging cycle A 10 to 100 ohm resistor with a wattage rating high enough not to go up in smoke during the charging cycle should be used A quick flip of the switch to first position and back renews the negative supply 5X VOLTAGE SOURCE Our last switching power supply is the 5x voltage source shown in Fig 3 Here we have five DPDT switches S1 S5 and five 100 uF 35 WVDC elec trolytic capacitors C1 C5 connected together to multiply the voltage of two 9 volt batteries in series by five The result will be a 90 volt output which can light neon lamp NE1 As shown in the schematic switch es 1 S5 are in the charge position with all five capacitors tied across the PARTS LIST FOR THE 5x VOLTAGE SOURCE Fig 3 Rl R5 22 ohm o walt 5 resistor R 470 000 ohm walt 5 resistor C1 C5 100 uF 35 WVDC electrolytic capacitor
80. the Decoder you have two options which we mentioned earlier filtered speaker and unfiltered out put The SC 150 presents filtered audio from a 3 5 mm monaural phono jack at the top of the unit next to the anten na connector 10 connect this to the Fig 6 This close up shot shows you where to make the ground connection for demodulator output on a Uniden SC 150 POCSAG MESSAGES POCSAG transmissions are always preceded by a preamble consisting of a series of alternating 1 and O bits at least 576 bits in length at the same baud rate as the upcoming data This is done to accommodate battery saving functions in pagers The remainder of a transmission con sists of one or more batches A batch consists of exactly 17 codewords of 32 bits each Each codeword is transmit ted in high order bit first sequence The first codeword in every batchisa synchronization word Although 8 sync codes have been defined the only one currently in use is in hex 7CD215D8 The other 16 codewords in a batch are defined as 8 consecutive frames of 2 codewords each The frames are numbered 0 through 7 in the order transmitted Each data codeword in a frame may be one of three types an address co deword a data codeword or an idle codeword An idle codeword is in hex 7A89C197 Address and data co dewords are distinguishable by their high order bit which is 0 for an address codeword and 1 for a data codeword Idle codewor
81. the skills you need to win your own exceeds those gained through independence ina traditional commuter successful career institutes while At CIE we pride providing an educa Ourselves in keeping tion schedule to pace with the latest match your commit developing technolo ments and lifestyle gies In turn this Our patented assures Our students learning program is that upon graduation specifically tailored they can mesh for independent seamlessly into a study and backed up variety of exciting and by a caring team of rewarding technology professional educa based Careers tors who are at your Back in the 1930 s Computer Programming call whenever you we specialized in need their help teaching radio and At CIE we ll television sciences Today it s computer technology program ming robotics broad cast engineering information systems management and the electronics behind it all But some things match our training with your background and Career goals and help you decide which of the many Career courses that we Offer suits you best We offer an Associate Degree have not changed like Program and through the desire of CIE s our affiliation with faculty and staff to see Electronics Technician World College a their graduates succeed Bachelor Degree That is why at CIE we teach not only Program the hands on practical aspects of If you have the sincerity the electronicstechnology but al
82. to 2000 UTC Mondays through Fridays The transmitter a vintage low pow ered 1 kilowatt Dutch made Phillips sender was already nearly two dec ades old when it was installed on the Antarctic peninsula in 1980 Since then Barrera reports the harsh ele ments of wind and snow have taken their toll making it somewhat difficult to transmit from this old unit The station s music library still relies mostly on old 33 3 RPM LP records some 1200 of them although in 1996 LRA36 received its first batch of 13 CDs of Argentine music As a part of Argentina s Servicio Oficial de Radiodifusion and its Radio Nacional the Antarctic outlet hopes that there will be funding made avail able for modernization of the aging facility says Barrera its programming is frankly curious One of its regular Spanish language programs Descubriendo la Argentina or Discovering Argentina focuses on tourist attractions of the home country One can only wonder who station offi cials hope to reach with this bizarre broadcast For SWLs if the signal is strong enough the musical programs are var ied and enjoyable although it is a bit Surprising to hear romantic Argentine tangos aired by a radio station in such a remote and frigid locale it is evident that the local military personnel and their families prefer the broadcasts of two 24 hour day short range FM relay operations that receive Argentine mainland programs via Sateilite from FM
83. x 6 6 4 80 349 3 20 GS152 150mm x 250mm 5 91 x 9 84 8 69 598 5 78 GS153 150mmx300mm 5 91 x11 81 10 20 7 20 6 80 GS1212 305mm x 305mm 12 x 12 NEW 18 88 15 73 12 59 Double Sided loz Copper Foil on Fiberglass Substrate PRICE EACH CAT NO DESCRIPTION l 10 50 GD10 1 100mm x 150mm 3 91 x5 91 5 07 3 68 3 38 GDIl4 114mm x 165mm 4 6 x 6 6 5 95 429 3 99 GD152 150mm x250mm 5 91 x9 84 1047 7 39 6 98 GD153 150mmx300mm 5 91 x11 81 11 95 8 69 8 30 18 35 14 68 D1212 305mm x 305mm 12 x 12 NEW 22 09 Developer This productis used as the de i veloper on our positive photo resist printed circuit boards Includes instructions 50 gram package mixes with water makes 1 quart ay A PRICE EACH CATNO DESCRIPTION 1 10 25 POSDEV Positive Developer 95 80 50 Etching Tank this handy etching sys tem willhandle PC boards up to 8 x9 two ata time Ideal for etching your PCB s systemincludes anair pump for etchant agitation a thermostatically controlled heater for keeping etchant at optimum temperature and a tank that holds 1 35 gallons of etchant A tight fitting lid is also supplied to prevent evaporation when system is not being used Typical etching time is reduced to 4 minutes on 10z copper board REDUCES ETCHING TIME CATNO DESCRIPTION PRICE 12 700 Etch Tank System 4837 95 AC Power Cords Our power supply cords are economi cal and practicat for OEM and re placement applications We stock 6
84. you are not convinced that you would like to master Speed Learning simply return the program for a prompt refund See the coupon for low price and convenient credit terms RISK FREE ORDER FORM L YES want to try Speed Leaming for 15 days without risk Enclosed is the first of 4 monthly payments of 32 25 if I m not completely Satisfied may return it for a prompt refund L SAVE 8 00 prefer to pay the 129 00 now and save the 8 00 shipping amp handling charge may still return the program for a full refund Method of payment Federal Tax Deductible Check or money order payable to Learn incorporated Charge to L Visa MC O AmEx O Discover Card Exp Signature Phone Name Address City State Zip Plus 8 00 shipping and handling U S funds only For New Jersey residents sales tax will be added learn Dept LPE 01 113 Gaither Drive INCORPORATED Mt Laurel NJ 08054 9987 SduU0IjDa g WeINdOY 7661 YEW March 1997 Popular Electronics Columbia mission becomes longest shuttle Hignt Baseball SSA 1206 96 Updated 10 37 AM ET i NCAA 9 3 A Dow tumbles on Web tech pole Greenspan words Opinion Federal Reserve charr s comments also force 4 Travel sell offs m Europe Japan a Lotteries GUSA TODAY i Sne pahot Families to testify in shopping Simpson civil case 2 index aa to bg as close da
85. 01A 12 10Hz 1MHz in 5 ranges Output 0 8Vrms_ sinewave frequency per Vrms Output distortion Output impedance 600 ohm RF Signal Generator Audio Counter SG 4162AD 229 95 Generates RF signal same as SG 41808 6 digit frequency counter 1Hz 150 MHz for intemal and extemal source Sensitivity lt SOmvV AG 2601A 150MHz for intemal and sources Sensitivity lt 50mV 800 526 2532 609 897 1135 FAX 609 897 0206 ALFA ELECTRONICS P O BOX 8089 Princeton NJ 08543 8089 CIRCLE 26 ON FREE INFORMATION CARD 0 10Vp p squarewave Synchronization 3 of oscillation 0 05 500Hz SOkHz 0 5 50Hz 500kHz Generator Counter AG 2603AD 229 95 Generates audio signal same as 6 digit frequency counter Four digital meters for vol and current display Excelent ton and low ripple Short circuit and overioad protected Also avaiable 30V 5A triple 549 95 Dual tracking 30V 3A 30V AA 60VGBA 6OV 5A unction Generator FG 2100A 169 95 0 2 Hz 2 MHz in 7 ranges Sine squarefriangle pulse ramp Output SmV 20Vp p 1 distortion DC offset 10V VCF 0 10V control freq to 1000 1 Function Gen Counter FG 2102AD 229 95 Generates signal same as FG 2100A Frequency counter 4 digits Feature TTL and CMOS output Sweep Function Gen Counter 329 95 0 5Hz to 5 MHz in 7 ranges Sweep Linear10 1 Log 10 1 20ms 2s AM Modulation Gated Burst Voltage Control Gener Generator Control Voltage amp 6 digit counter 1H
86. 04 Tel 415 655 8000 800 222 SONY Fax 415 655 8001 Web http www sony com Suggested retail price 199 When Sony decided to test the waters of the videogame market it didn t just stick its toes in It jumped right in with its 32 bit PlayStation and made quite a splash Within a year of its introduction Sony Computer Entertainment America SCEA shipped close to two million units and SCEA and its third party publishers shipped about 9 million game CDs According to Sigeo Maruyama SCEA chairman and CEO The PlayStation game console is one of the most successful new products that the Sony Corporation has introduced during the company s en tire 50 year history Maruyama attributes the platform s success to several factors including its technological superiority a diverse selection of software titles and the power of the Sony name We can t argue with the name recogni tion factor Let s take a look at the other two claims The PlayStation is a 32 bit CD ROM based system that packs the power of a computer workstation into a gray plastic climbs hills or even trees slides down slopes He swims in fountains pools or the ocean creeps crab like along walls hangs by his fingertips over ledges and then pulls himself up In one snow covered landscape he slips and slides down icy slopes bringing the player closer to the sensation of skiing than any ski simula tion games we ve tried You can
87. 11 is also a good place to get a signal Use an oscilloscope if possible to select the squarest looking signal in addition to the signal take off point you must of course also bring out the scanner s circuit ground Warning In some handheld scanners we have examined the case side of the externa speaker jack is not grounded Look on the circuit boards Continued on page 60 E US amp aka p Tf z f s N ae ee Am a J lia a a eit eh a oe Pas hens as a guide to locating the signal cannection point for demodulator output Build an Electronic Parrot Enjoy hours of entertainment with this digital little friend that realistically repeats whatever you say to It D 1 Ji a een A ESS ee ar ae a r i ing on the open seas a couple hundred years ago For this rea son perhaps you ll find that stereo typed pirates often had parrots on their shoulders The idea is that they d pass some time trying to get their birds to say things Anyone who s done the same with a parrot or parakeet knows it could be quite funny when they fi nally speak Well thanks to electronics you can have a talking pet that a ways repeats what you say The Electronic Parrotde scribed in this article is a digital voice recorder with automatic playback When the Electronic Parrot is powered up it will listen for speech record it then automatically play it back T
88. 19345 JISIMYSHIO SS2INN SOVYVsJONSIA NI O31VOIGNI SUOLIOvd D SAHO 000 6001 D3 SAHO OOO i X SWHO NI OFiLVDIONI SXOl1SI6 34 310ON SSMS WILYJH T any di Sule 2 A U m e ew d JO y WO l W2LBIANOD 9399 I A March 1997 Popular Electronics VMN DINY ST C O Fig 2 This pictorial diagram for an early stage of construction shows most of the controls Along 65 the top left to right Antenna Tuning Bandspread Bandswitch Volume and Sensitivity Along the bottom S Meter Adjust at left and Code Normal Switch next to fuse holder March 1997 Popular Electronics nally sold as kits It seemed silly to have to buy all those extra pages of kit build ing instructions for a radio that had already been assembled Well was wrong started to check the Star Roamer by comparing its wiring against the schematic Starting at the front end antenna end of the radio quickly got tangled up in the hard to follow connec tions associated with the bandswitch thought maybe should resort to a pic torial diagram from the kit instructions That way could see if the switch con nections are right without actually trac ing them electrically That worked out so well that con tinued using the pictorials as checked the remainder of the wiring The orga nization of the Knight manual really made it easy The parts are wired in layers with a separate pictorial dia gram provided fo
89. 240 P O Box 2824 San Francisco CA 94126 Please rush FREE details immediately NAME ADDRESS iama _ CITY ig we a STATE Wo AIP pannen meme ONE gt oe SMALLEST Wireless Video Transmitters Used by hundreds of hobbyists and professionals alike in R C models Robots Surveillance Video movie Special Effects and Law Enforcement previously used expensive wireless units trom Pelee MVP and Supercircuits Nothing approaches the VidLinks in power picture quality size and vaiue Thank you A Leslie CCTV Installer NY The best Incredible color resolution very easy E to use cool P Davis Movie Props CA Actual Size AEGIS CAP TR OF ETD aa 9 Voit Battery Live Remote Video From 99 00 e Full 100 mW RF Power Range 500ft to 1 2mile e e Crystal Controlled e e High Resolution Full Color B amp W video e Fully epoxy encased no exposed components Fully assembled only two wires to attach e MONEY BACK GUARANTEE VidLink 100 100mW Power upto 1 4 Mile 199 00 New High Power VidLink 15 15mW Power upto 150 Feet 99 00 New Low Price Same Size Covert Camera 1 1 4 sq Pinhole Lens 169 00 Pro Grade Japanese Quality Audio Module Now Available Call Check MO COD 5 00 S amp H 5 50 AEGIS 671 1225 E Sunset Dr RESEARCH Bellingham WA v 98226 3529 USA 1 604 224 0416 Visit our virtua
90. 3 Tempe AZ 85282 XVS100 TV CAMERA TV TRANSMITTER Use any TV or VCR with lili lain VERI a video input connector Power cube included Uses the UHF TV band pack of cigarettes Transmits videoand f grow to a high pitched squeal as the sig f Range up to 1 mile Range up to 1 2 mile nal strength increases Custom frequencies available Custom asi ayallabie r XST 500 Voice transmitter Range up sto 1 mile Supersensitive mic Uses 9 volt battery Uses surface mount components XWB 1000 Voice transmitter Range up to 1 2 mile Includes mic and battery on circuit board Uses surface mount components XST 500EZ XWB 1000EZ XFM 100C XFM 100 Voice transmitter Range up to 1 49 95 46 95 21 95 mile 9 v battery and leaded components XSP 250 Super miniature telephone GPP transmitter Range 1 4 mile Powered by Py j hr W s phone line Uses surface mount component a XTR 100 Tracking transmitter Range upto f 1 mile Uses 9 volt battery Transmits a BEEP os XSP250EZ XTR100C TT 100C BEEP BEEP tone 34 95 29 95 19 95 to 1 mie Uses 9 voit batey o o T XLB 3 3 95 E E 3V CAMERA i BATTERY XLB 9 8 95 9V LITHIUM Small 3V Lithium BATTERY battery For use Worids most powerful with XTL3000 9V battery Twice the life XTL1000 XTR300 of a kaline batteies and XWB1000 PROJECT BOX z Ideal project box to give your 16 levels of digital voice changing Sound
91. 4 Pg Book 29 95 I 34 95 MOON WALKER OWI 989K Solar Sensor 10 Pg Book THE GREATEST SPY BOOK EVER The Whole Catalog If you are not getting il AR inal riour fary 9 for Rersaminss Mi this catalog you are wear spres dnd Gerwrnfiy missing out on some pe Nosy Meophe of the best deals in gt electronics Sig We have thousands of items ranging from unique hard to find parts to standard production components Call write or fax today to start your free subscription to the most unique catalog in the industry tilled with super values on surplus electronic and hobbyist type items If you have a friend who would like to receive our catalog send us their Jadi a or II oladi How to Locate and Bug Ans Any Phone Dei adie ACPISIS AMG UE WR BRE Conduct Video Surveillance install Latest forward them a complementary 100 page Counter Measures Research Anyone Track catalog Anyone s Assets Hire Ex CiA KGB Agents Real Inside Secrets Pius latest in night vision order satellite photographs of anywhere on earth best book sources for CIA publications ID changing private detective schools newsletters courses and associations latest B amp E tricks Recom mended or hated by CIA directors the world s most fa mous private detective KGB officers Lee Lapin does it again THE WHOLE SPY CATALOG 440 pages 49 95 540 East First Street Fax Order Line PP orders 1 4115 513
92. 49 00 med oe m Low Output noise rating less than 0 3mV Line load regulation rated at low 0 01 ImV Transient response time of 50u Sec Overload protection and Output enable disable gt Coarse and fine voltage current adjustment 3 Auto series parallel operations for triple output supplies i AMREL Offers Features And Prices on Digital Power Supplies That The Competition Can t Beat Microprocessor controlled User friendly keypad data entry e Low output noise rating less than ImvV Line Load regulation rated less than 2mV Output enable disable and Power off memory Optional RS 232 interface capability wilt ead _LPS 103 LPS 104 LPS 105 LPS i06 1 1 V 2ACH 15V 4ACH 30V IA 30V 2 5A 30V IACL 30V 2ACL AOV IA 30V 2 5A 5V 2A 3 3 5V 3A_ TF S999 e 1 599 S0V 1A A102 30V 3A 30V 1A A0V 1A oe Als ale 225 KMAL Oe fae Pace s s sige tall I 600 638 2020 gt 8931 Broci yi e Road BEST pling Ma lang 20910 Fax 300 di 00 Re n n e i Eae anera as eh CIRCLE 46 ON FREE INFORMATION CARD S31U04 4938 3 seINdOY 7664 YoseEy on March 1997 Popular Electronics amp Ne vv Pre Owned Test Equipment Goldstar Pre Owned Oscilloscope Specials B K Precision 1476 10 MHz 229 00 Great Starter Scope Tektronix 465 100 MHz 599 00
93. 5549 or Intelligence Inc Dept K Dayton Ohio 45402 1 800 344 6324 2228 S El Camino Real San Mateo CA 94403 Top 50 surveillance product catalog FREE w order Order Toll Free TiTa TTT 1 800 344 4465 CIRCLE 147 ON FREE INFORMATION CARD 7 lt 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 Why pay more Call today Debco is a Kit Builders Paradise Bectrenic Mtr Mant Parts Computers Ausateer Radia RY Call Debco today for your FREE copy of The Electronic Experimenter s Journal 1800 423 4499 Deboo Electrenies 4025 Edwards Rd Cincinnati OH 45209 5 GOOD REASONS TO BUY OUR FAR SUPERIOR PRODUCT PRICE EFFICIENT SALES AND SERVICE WE SPECIALIZE IN 5 10 LOT PRICING ALL FUNCTIONS COMPATIBLE WITH ALL MAJOR BRANDS gt ANY SIZE orben FILLED WITH SAME DAY SHIPPING RBR AA S g rT We handle NEW equipment ONLY Dont trust last years OBSOLETE and UNSOLD stock COMPETITIVE PRICING DEALERS WELCOME ELECTRICAL HOURS Monday Saturday 9 5 C S T SUPPLY amp WARE HOUSING Reter to sales personnet for specabeatans CORPORATION P O Box 8180 u Bartiett IL 60103 a 800 577 8775 n amp not the intent of B E W to dctraud any pay television operator an wE wil Not Assist any t omaany oF INdividuatl in doring the same So1u0N9949 JeiINdoY 7661 yasey 111 CABLE
94. 967 COMPUTER SOFTWARE ZSORT Sort nuga files fast Disk 5 00 Manual 10 00 Box 12238 Lexington KY 40581 2238 JNC 1 800 815 1512 E CABLE descrambier Anyone can build in Hustratons parts CABLE TV ATTN CABLE box owners Order you ID signal stopper now Send 23 00 to R R ENTERPRISE Box 3532 Easton PA 18043 CABLE descrambling new secret manual Build your own descramblers for cable and subscrip tion TV instructions schematics for SSAVI gated sync sinewave some free methods HBO Cin emax Showtime UHF Adult 12 95 2 00 posage CABLETRONICS Box 30502PE Beth esda MD 20824 seven steps with Radio Shack parts Plans kit from 5 00 plus free bonus 1 800 818 9103 DESCRAMBLE cable using simple circuit E Z to follow instructions and Complete universal kit with free Bullet Stopper 20 00 1 800 CABLE Bullet Terminator and 1 D Blocker Electronically shields yourself and your box Also new Super Bullet ID Eliminator Lifetime guar antee 1 800 820 9024 GIANT Sale Positive notch filter 18 00 E Z install cable test activaton chips boards from 5 00 Original equipment descramblers from xternal activators 125 00 Much CABLE box discount original equipment de scrambliers converters Super Q quantity dis count call now We ll meet or beat the competition TC TRONICS 1 718 349 6506 CABLE TV descramblers converters Quantity
95. AK6 or a 6AR6 which are interchangeable in this circuit The power supply is transformer operated and uses diode CR 3 as a half wave rectifier The set has a front panel mounted antenna trimmer C 3 and bandspread BY MARC ELLIS FUREHOLDER al Wal Fig 1 Here s the Star Roamer schematic as printed in the original Knight Kit manual C 4 capacitors Another control R 4 with the deceptive label sensitivity actually introduces a controlled amount of oscillation into the IF stage to make it serve as a beat frequency oscillator into the IF stage for CW code reception Switch S 2 is the AVC on off control and S 3 switches diode CR 2 into the circuit when necessary to act as a noise limiter Potentiometer R 11 is the volume control Phone jack J 1 automatically discon nects the speaker when headphones are plugged in S meter M 1 is connect ed across the AVC line and can be cal ibrated by the rear apron mounted S Meter Adjust control R 8 Also on the rear apron is key jack J 2 paral leled by S 4 which is labeled Code Normal When open S 4 places a key plugged into J 2 in series with one of the speaker leads which with the IF stage set to oscillate makes it possible to use the receiver for code practice WHAT S BEEN DONE ALREADY In the September and November issues we gave the Star Roamer a careful inspection noting that the origi nal owner had done a very competent j
96. AR WARRANTY ON ALL PRODUCTS VOID WHERE PROHIBITED Anyone implying theft will be denied assistance Don t rent own Cable TV Descramblers We ll beat Any Price eSame Day Shipping e30 Day Money Back Guarantee eCredit Cards C O D Have make and model number of equipment REPLACEMENTS FOR MOST SYSTEMS CALL TOLL FREE CABLE DISCOUNT 1 800 684 9135 NO NEW JERSEY SALES Anyone implying theft of service will be denied assistance BROADCAST TRANSMITTE FMS2 ter r Unit features ALC 2re empt 75 MHZ o 0 e CataloG 800 504 1178 TEK Line 416 243 2260 SCHEMATICS FOR UNIT 27 FAX POLL INFO 416 243 1067 SAITISH DESIGN AWARD ONLY GED Includes MGA CGA EGA amp VGA compatible Design large multi layer boards One level pull down menu and quick keys for fast layout T A e 6 Month Free npin 7840 ANGEL RIDGE ROAD Pree Demo ATHENS OHIO 45701 614 592 1810 Visa amp MasterCard Accepted New Surveillance Devices Smoke Alarm eo alarm or alarm clock your choice Wide field of view as SE resolution for ultra sharp images and super 1 lux low light sensitivity Undetectabe ey m 189 95 Ukra miniature video cameras hidden in smoke and Table Clock Video Carner TC 70 High quality B W with 420 lines cf a i Direct output of e mr video and audio Best price on surveillance cameras anywherel Telephone Tronsmitte K hidden in
97. Center when the car is purchased With the password the center can identify whether the call is made in error by the owner or the caller is a potential carjacker indicated by an incorrect password In the latter case police are sent to the car s location Mobile Security Network ADT Se curity Systems and Rockwell Auto motive Electronics are developing a competitive system to RESCU This emergency response system does not require buying a new Lincoln Conti nental or even signing up for cellular phone service Instead the system will be sold as an aftermarket item like a premium stereo system for installation in virtually any vehicle Rather than relying on cellular phone communications the ADT Rockwell system uses packet data communications technology When any one of the three buttons on the device which for example is mounted on the sun visor are pressed a distress signal is sent at the speed of light to an ADT Customer Monitoring Center CMC The data packet includes the vehicle s GPS co ordinates the nature of the emergen cy and a description of the vehicle There are three icons on the buttons to denote the type of assistance re quested a police badge a white cross and a tow truck There is also an optiona pocket sized key ring activator to activate the system up to 100 feet away from their vehicle Since a moving vehicles lo cation is transmitted every 20 sec onds police can use the syst
98. Computer Programming _ TV Video Audio Servicing _ Desktop Publishing in CD ROM A 22 7t 26 LT okt Wa oe eee T CALL 1 800 321 4634 FOR FREE CATALOG 4401 Connecticut Avenue NW Washington DC 20008 v Check one FREE catalog only High school diploma or GED recommended for all courses required for degree programs _ Networking with Windows NT C Bookkeeping and Accounting _ Visual Programming in C Mastering Microsoft Office the A Certification exam with NRI s exclusive You can continue receiving advice and feedback from your instructor after you graduate 2 You can turn to NRI for letters of recommendation transcripts tips On resume writing and more 2 You get the skills and confidence to move up on the job start a new career or open your own business 25 You can call our toll free number for a free catalog Or visit us at http Avww mhcec com on the Web Ask for Ext 2236 OR GET YOUR DEGREE _ AAS Degree in Accounting _ AAS Degree in Business Management Name please print Age Address l City of State Zip 3 Accredited Member Distance Education and Training Council 0018 0397 pi Division of The McGraw Hill Companies T March 1997 Popular Electronics Ner Watch EXTRA EXTRA nless you re really young and haven t seen any old movies the title of this month s column should evoke an image Mos
99. D March 1997 Popular Electronics CALL TOLL FREE CALL OR WAITE FOR 800 292 7711 orders only C amp S SALES A CATALOG Se Habla Espa ol EXCELLENCE IN SERVICE XK 550 Digital Analog Trainer TK 3000 Elenco s advanced designed Digital Analog Trainer is specially 95 89 designed for school projects It is built on a single PC board for maxi mum reliability It includes 5 built in power supplies a function gener ator with continuously sine triangular and square wave forms 1560 tle point breadboard area Tools Included SR 2 Deluxe Soldering Iron SH 1 Soldering Iron Stand ST 1 Diagonal Pliers e ST 2 Long Nose Pliers ST 30 Deluxe Wire Stripper SE 1 Solder Ease Kit ND 3 3 pc Nut Driver Set TL 8 Precision Screw Drivers e ST 5 Screw Driver Slotted 3 16 e ST 6 Screw Driver 1 Phillips ET 10 IC Puller o _ SP 2 Soider Pump A professional technician service tool kit in a ST 20 Safety Goggles metal reinforced tool case with heavy duty ST 9 Pocket Screw Driver handie and locks A removable pallet han ST 4 Soider Tube di t of the tools listed with e a A es most of the tools listed with more room for tools and parts in the lower half Model XP 581 4 Fully Regulated DC Power Supplies in One Unit XK 550 Assembled and Tested 169 XK 550K Kit 139 Tools and meter shown optional
100. G INFO 602 947 7700 Five Year Warranty FAX LINE 602 947 7799 FREE SHIPPING Visa M C Amx Disc COD s Q BU EAVESDROPPING is Unbelievably widespread Electronic f Devices with emezing capabilities can be monitoring your telephone and room conversations RIGHT NOWI Are you sure you re safe FREE CATALOG tells you fest Includes Free Bonus detaile on fantastic opportunities now open in Counter Surveillance field Exciting immensely interesting and EXTREMELY profitable up to 250 hr full part time income Call Now _ COS BE A LOCKSMITH Home study Learn locksmithing for a great career or to start your own at home business i FREE LITERATURE 800 223 4542 Name _ d A Ane City _ State Zip The School of Locksmithing Dept LKC341 PCDI 6065 Roswell Ad Atlanta 30328 x ED oe ee ee ee eee oe g A F A LOWER YOUR CABLE l gon ELECTRICIAN systems wiring utilities phones and more BILL NOWI i FREE LITERATURE 800 223 4542 CHANNEL SURFERS Mane eat i City State Eaa gee Zip a The Electrician School PCDI DEPT TEC341 6065 Roswell Road Atlanta Georgia 30328 a eee ee ee STOP MISSING YOUR FAVORITE RADIO PROGRAMS Use RIESI tak Radio Timer Recorders Like a VCR For Radio Includes AM FM radio Digital clock Digital tuner 4 hour timer recorder RT 101 or 1 hour timer recorder RT 201 Auto stop cassette tape deck Micro phone input jack LCD display head p
101. IC5 b are gated by IC6 a and IC7 a A pulse from IC5 a results from S1 subsiding while pulse from IC5 b results from 1 closing the correct number of times When both pulses are present at the input of IC6 a an output occurs The IC6 a output is then gated with the pulse from C3 b in IC6 b in order to blank out any over counts such as 15 18 or 25 28 pushes of 1 Integrated circuit IC3 b triggers on the error pulse caused in part by exceeding the cor rect number of S1 closures and multi ples thereof The IC3 b output pulse is approximately 3 5 seconds By the way the RC values used for the one shots in this circuit may not prove out mathematically but the pulses are sta ble enough for this application The error pulse is derived from gat ing the outputs of IC5 a and IC5 b in IC7 a If the output pulse of either IC5 a or IC5 b is present when the other is absent then there will be an output pulse from C7 a If however the puls es from C5 a and C5 b are either both present or both absent then no pulse will appear at the output of IC7 a unless those present pulses don t completely overlap each other So to prevent false error pulses from this source the output of IC7 a is gated with the output of IC8 a a D flip flop which goes low when IC5 b is trig gered IC5 a is delayed if S1 has stopped being pushed Charging C1 at power on causes a false error pulse which is suppressed by gating the
102. IST FOR THE ALPHANUMERIC PAGER DECODER SEMICONDUCTORS ICI PICI6C54 preprogrammed microcontroller integrated circuit IC2 LF444CN quad low power op amp integrated circuit IC3 LP2950CZ low drop out 5 volt regulator integrated circuit QI 2N3906 general purpose PNP silicon transistor Q2 Q3 2N3904 general purpose NPN silicon transistor D1I D6 1N4148 general purpose silicon diode LEDiI Light emitting diode 3 mm diameter red RESISTORS All resistors are s watt 5 units R1 R2 R5 R7 R8 47 000 ohm R3 R11 R12 RI8 10 000 ohm R4 R1I5 200 000 ohm R6 R17 2200 ohm R9 R13 470 000 ohm R10 4700 ohm R14 68 000 ohm R16 R20 100 000 ohm R19 100 ohm CAPACITORS Cl C2 15 pF ceramic disc C3 0 022 yF Mylar C4 C6 C8 I1 pF 16 WVDC tantalum C5 ClO 0 001 wE ceramic disc C7 47 pF ceramic disc C9 l uF nonpolarized Mylar see text ADDITIONAL PARTS AND MATERIALS XTALI 4 MHz crystal in HC 49 US package J1 J2 3 5 mm mono phono jack SOI DB 25 female connector with solder cup terminals H1 H2 Two pin header right angle break off pin strip 0 1 inch spacing Printed circuit materials DB 25 connector hood designed to accommodate a DB 25 at both ends jumper shunts 0 1 inch spacing to fit H1 and H2 cable with a 3 5 mm plug on each end wire solder hardware etc Note The following items are available from Cylex Inc 2501 Afton Court Le
103. IT INCLUDES BASE AND SOLDERING amp COMPLETE INSTRUCTIONS TO ORDER OR MORE INFORMATION MAIL TO 68 75 OE e a aX ee a R amp S JA 2788 C R 135 C DOLA OHIO 45835 TEL 419 759 2558 FAX 419 365 5112 The Original HE Ae PUTA E A patented adjustable positioner for the repair of electronic apparatus including audio amp antique radio and ham equip Maneuverable on casters it features ad justable work height 449 00 chassis width to 28 plus UPS and chassis inversion Large enough to handle Scott radio and Fender IRON SUGGESTED RESALE MASTERCARD VISA Fo 26 ASY WAYS to NeLp save THE eAetH CALL Z00 498 0837 Mini Mods Miniature Engineering Modules Pocket Watch 19 Real time clock w alarm amp leap year compensatlon RamPack 19 8ix8 serially addressable SRAM Motor Mind 24 5 Serially controlled H Bridge driver Mini Watt 24 SV 200mA battery power supply wicharger Add 10 for power cube and NiCad First three products use serial communication S amp H extra All products designed for use with micro controllers and micro processors SOLUTIONS CUBED 3029 F Esplanade Chico CA 95973 916 891 8045 www solutions cubed com amp chassis 35 Ib sh 1645 W 5th Street Washington NC 27889 Mastercard Visa COD Check COUNTERSURVEILLANCE VIANUFACTURER Al 2100 r VIBRATI
104. Indication e dB Meter e LCR Meter PM 129 LED Display Indication Method LCD Display e Watt Meter e Other Industrial Measuring Method eT eet Overrange Indication 1 Shown in the Display A D Converter System Input Impedance gt 100 Mohm e Current Meter amp Domestic Uses ovenan ge Indication 1 Shown In the Display vegas 5 0 08 234 5 C lt 80 RH PM 128 3 1 2D LCD Digital Pane Meter Reading Rate Time 2 3 Readings per sec Power Dissipation ImADC 129 3 Input Impedance gt 100 Mohm Decimal Point Selectable w Wire Jumper PM 129 3 1 2D LED Digital Panel Meter accuracy su Gir EE ATRD conchae EV DC Features Power Dissipation PM 128 ImA DC Size 67mm x 44mm PM 129 60mA DC 200mvV Full Scale input Sensitivity Seiachable WINKO J Selec w Wire Jumper Decimal Point PM 128 Single 9VDC Operation PM 129 Single 9VDC Operation ai ee ae Decimal Point Selectable Size 67mm x 44mm PRICE EACH PM 128 13mm Figure Height CATNO DESCRIPTION 10 25 1 250 Automatic Polarity Indication PM 128 3 1 2 Digit LCD Panel Meter gt 90 7 09 640 586 5 25 Guaranteed Zero Reading for0 Volt Input PM 129 3 1 2 Digit LED Panel Meter 11 49 9 54 8 67 7 95 6 95 High pest Impedance gt 100Mohm PM 328 4 1 2 Digit LCD Panel Meter 19 88 16 40 14 90 13 66 11 93 Ball Bearing 12V DC Fans These High Quality Fans feature Ball Bearings and Brushless DC Motors All of them are designed to meet UL CSA amp VDE Stand
105. K PART J NUMBERS Fig 7 With this circuit you can add a remote bell to an existing doorbell circuit without tearing out walls to access the wiring between the door button and chime 9VDC or 560 ohms for 12VDC Therefore V could be either 5 9 or 12 volts DC George T Kysor San Jose Costa Rica Wow Great design work recom mend an optical coupling to the sole noid circuit Using a relay or a plain solid state switching device common to the solenoid could be compromised by ripping out the switch and flooding the circuit input with high voltage BELL ANSWERING MACHINE Want to know for sure if a friend or maybe the cable guy has stopped by your house Build the circuit shown in Fig 4 It is similar to a phone answer ing machine but it is for your doorbell The circuit is simple When some one depresses S1 which replaces your doorbell pushbutton the doorbell rings and Q1 switches on The tran sistor in turn triggers both monosta bles The first one will energize relay RY1 for approximately 13 seconds which will cause a tape deck to play a message from a looped cassette a cassette that repeats without rewind ing The second monostable will ener gize relay RY2 for approximately 23 seconds via Q2 starting a deck set to record your playing message as a separator between messages plus a message from your visitor for the remaining 10 seconds The two variable resistors allow you to adjust the outgoin
106. LEDs Mark the right edge of AC LINE VOLTAGE MONITOR ple so point to point wiring can be those two mounting holes on the i i used if you like However the use of a cardboard with the awl SEMICONDUCTORS l PC board makes construction easier Now or later you can tape this IER 1C2 LM324 quad op amp and makes mounting the finished cir cardboard to the cover of the mount integrated circuit cuit in a case easier as well You can make your own PC board using the foil pattern in Fig 2 if you like or you can simply buy the kit and use the board that comes with it ing case and drill the holes in the marked locations Select drill bits based on the size of the LEDs and mounting hardware you use If you are using the drill guide in Fig 3 or if you DI D2 1N4148 silicon diode D3 IN4733 3 1 volt Zener diode or equivalent LEDI LED7 Light emitting diode any color see text You re probably going to want to are done with the above procedure RESISTORS yaa 3 mount the PC board in a small case then you can proceed with assem E TESIEN ADE PAN A a i few i a on hird ao R1 700 ohm ore you start working on the R2 R4 R RS RIO R12 R1S board can save hours of work mea 000 ohm suring things later on Any small case will do as the PC board is very small Ri RS R7 R9 Ril RIS RI4 330 ohm You don t have to do this if you use the R15 630 ohm drill guide in Fig 3 or a copy of it but R16 HKW ohm tri
107. MMAX 629 ICE TECH MICROLV 795 CHROMA SIMM SIP 650 EETOOLS ALLMAX 359 MOD MCT EMUPAVR 409 EETOOLS MEGAMAX 279 MOD MCT EMUP R 509 EETOOLS MEGAMAX4 49 EPROM 1G TO 512K 369 XELTEK SUPERPRO I 69 EPROM 1G TO IMEG 409 XELTEK SUPERPRO TP 99 EPROM 4G TO IMEG 249 XELTEX SUPERPRO L 199 EPROM 16G TO I MEG 165 XELTEK ROMMASTER It 89 EPROM 1G TO 8MEG 479 MOD MCT EMUPA 129 EPROM 4G TO 8MEG 739 STAG ORBIT 32 250 EPROM 8G TO 8MEG ADVANTECH EETOOLS NEEDHAMS DATA I O ICE TECHNOLOGY HILO ae GENERAL CHROMA MODULAR CIRCUIT TECHNOLOGY XELTEK internal card Easy to use software that programs E E prom Flash amp Dalias Ram 27 C 28 C F 29 C F 25 series from 16K to 8 Megabit with a 32 pin socket Adapters availabie for MCU s 874X 875X Pic 40 Pin X 16 amp Serial Eprom s PLCC 5 Gang and Eprom Emulator to 32K X 8 P C P L A E amwe Windows 95 Same Name Address amp Phone for 13 Years isn t it Amazing Intronics Inc Box 13723 612 Newton St Edwardsvilia KS 66113 Add 4 75 COD Tel 913 422 2094 Add 4 00 Shipping Fax 913 441 1623 Visa Master Charge Microsoft s Windows 95 one step at a time screen Then you need a copy of Windows 95 One Step at a Time Develop your expertise with the straight forward LABTOOLA8 MICROMASIER SUPERPRO ALLMAX PLUS ROMMASTER General Device instruments Sales 408 241 7376 Fax 241 6375
108. Maker is a truly cost effective package which is sure to handle your most demanding PCB design tasks TraxMaker can be used as a standalone product or with compatible schematic capture products When used in conjunction with CircuitMaker TraxMaker completes a powerful beginning to end circuit design system TraxMaker Features Exceptionally easy to learn and operate e 6 signal layers plus power and ground planes top and bottom overlays and i solder and paste masks gt m m ir Built in autorouter which provides routing of a a i entire board individual nets pad to pad i J a ae t without net or interactive using ratsnest ried ji tute TUNEN e Automatic component placement with user wt definable placement grid and keep out areas Full support for both through hole and Surface mount components e Output to any Windows compatible printing device Gerber files and Excellon N C drill file e Import CircuitMaker Protel and Tango netlists e Orthogonal curved and any angle tracks e Design objects include tracks pads vias arcs free text rectangular and polygon fills Includes a wide selection of component sti ae patterns and new patterns can be quickly Boho Ove i ArT See and easily created e Choose either Metric or English units e Maximum resolution of 001 inches 1 mil e Maximum board size of 32 x 32 inches Call Now to Order or FREE Functional Demo Request Additional Information Product literature and
109. Meter 92B 2ch 60 MHz 1 800 92 FLUKE The ScopeMeter 90 Series test tools with a 10X brighter screen Daylight or darkness Indoors or out No matter where you re troubleshoot ing it s easier with our ScopeMeter 9OB Series They re the same rugged dependable hand held scopes you knew only much easier to read thanks to a cold cathode fluorescent screen that s literally 10 times brighter They re also much more accurate with a choice of 190 MHz or 60 MHz bandwidth and up to 5 Gigasamples second repetitive sampling rate There s even video triggering four hours of battery life and a new time and date clock feature And for a limited time Fluke is offering its 92B 60 MHz unit for only 945 That s a savings of 550 off the regular price of 1 495 It s time you saw the light yourself To get your hands on a powerful ScopeMeter test tool call Fluke today at 1 800 92 FLUKE 1996 Fluke Corporation P O Box 9090 M S 250E Everett WA USA 98206 9190 U S 800 44 PLUKE or 206 356 5400 Canada 905 890 7600 Europe 31 40 2 678 200 Other Countries 206 355 5500 All rights reserved PLU 281 104 CIRCLE 158 ON FREE INFORMATION CAR March 1997 Popular Electronics Electronics Libr PATENT IT YOURSELF 5th Edition by David Pressman The newly revised fifth edition of this guidebook for inventors has been up dated with new information about soft ware and other computer related inv
110. Minnesota Acme Electronics 224 Washington Avenue N Minneapolis MN 55401 Missouri Gateway Electronics Of MO 8123 25 Page Blvd St Louis MO 63130 William Elec amp Ind Supply 803 Davis Blvd Sikeston MO 63801 New Jersey Lashen Electronics Inc 21 Broadway Denville NJ 07834 New York Sylvan Wellington Co 269 Canal Street New York NY 10013 R amp E Electronics 4991 Rt 209 Accord NY 12404 Unicorn Electronics Valley Plaza Johnson City NY 13790 Ohio Philcap Electronic Suppliers 275 E Market Street Akron OH 44308 Oregon Norvac Electronics 7940 SW Nimbus Avenue Beaverton OR 97005 Pennsylvania Business amp Computer Bookstore 213 N Easton Road Willow Grove PA 19090 Texas Mouser Electronics 2401 Hwy 287 N Mansfield TX 76063 Tanner Electronics 1301 W Beltine Carrollton TX 75006 Electronic Parts Outlet 3753 B Fondren Houston TX 77063 Electronic Parts Outlet 17318 Highway 3 Webster TX 77598 Washington Amateur Radio Supply Co 5963 Corson Ave Ste 140 Seattle WA 98108 If you d like to sell our magazine in your store please circle 180 on Free Information Card airwaves with this device and view them on your computer screen BY ALAN D JONES igital pagers or beepers as Diez commonly called have become exceedingly popular in the past decade Pagers of all kinds are clipped to the belts of millions of people today and it s quite like
111. NG TRANSMITTER DETECTOR DE Bo ires o gt FM Wireless Mics outtctan AM Transmitters UHF Transmitters Al 6600 PHONE TAP DETECTOR DETECTS e Radio Frequency 7 Taps e Series and Parallel Taps e Line Impedance Taps e Extension Phone Listeners Al 5500 Comp ete SAFETY SYSTEM DETECTS All Phone Taps and Extension Phone Listeners All Body Wires Wireless Mics AM FM and UHF Transmitters DEFEATS All Body Wires Transmitters and Distance Microphones with its built in white noise generator TFRVD 900 Tpaneter Ta TAPE RECORDER DETECTS Body Wires ViDEO DETECTION SYSTEM FM Wireless Mics AM Transmitters UHF Transmitters Tape Recorders Video Equipment Alerts User By Vibrating and or Illummated LEDs FEATURES 2 4 GHz Video Audio Transmitter 4 Channel Receiver 300 Transmission Range Black amp White CCD w Auto Iris Lens 410 H TV Line Resolution FCC Approved Frequency Send 6 00 Items May Be Purchased by Certified Check Money Orde or C 0 D Quantity for 32 P cataog AMERICAN INNOVATIONS ING sccur s FREE w Purchase 119 ROCKLAND CENTER SUITE 315 NANUET NY 10954 at ack WSS 100 WIRELESS SURVEILLANCE SYSTEM Sees amp Hears EVERYTHING Voice 914 735 6127 gt Fax 914 735 3560 Eem HTTP WWW SPYSITE COM E Man AMERICAN SPYSITE COM CA CHASSIS HANDLER The Tech Shack 919 975 2677
112. Powerful Data Anatyzer Oscilloscope plots output In Real re Logic probes voit current meters LEDs Seven Segment Time during the simulation Including complex math expressions Displays Hex keypads Clock sources Voltage Current sources Sin Cos Tan Log and other trig functions plots real part includes PULSE SIN EXPONENTIAL FM Arbitrary source imaginart part Magnitude phase decibles absolute value generates voltage or current based on Supplied Equation Calculates Derivatives almost anything you want Current Voitage controled sources re interactive digital simulation with giitch setup and hold violation detection single step mode variable speed simulation printable timing diagram output truth table generation binary to seven segment displays hex keypads digital clock sources bulit In logic analyzer can be set up to generate breakpoints during simulation from user defined AND OR combinations signals and sequential events to help debug circuit timing logic race problems Simulates tri state open collector amp don t care logic RAM ROM one shot carry look ahead shift reg pull up down resistors more me offer 00 PO Box 157 Renularts 149 E D island J Logix Be Waukegan Hlinois 60085 Poh enna only 69 Toll Free Order Line 1 888 847 0080 PEERY pea eae D nttp www islandiogh com amp Phone 847 360 0458 ats 30DAYMONEY 2 BACK GUARANTEE When used in conjunction The digital video
113. R A T scammers infectors and other wrongdoers who users aol com wizguru hi tech htm Since 1971 crimes abuses and 8 Pere TT card counterfeiting magnetic stripe false an Eck Systems ata Car eader Case histories law counter Sound Detectors Receivers Xmitters Jam measures ESS Infinit evices Voice Ce y COMPYUTER 539 DTMF Decoders Carjack Foiler Child etrate each other and how VIRUSES TRO sound amp Infrasound Electronic Dowsers abuse methods and countermeasures In Buy Catalog Today protection system BBS advice password Details on how they work and dozens of ID Orange Beige Cheese and CF Boxes ten to even erase messages and to convert j form one FREE search of our massive cell Stun Cur Taser Prod Cane Blaster PAGER z b s Ladder Geiger Counter Fish Stunner BEEPER 39 yee WO aor ny re ana Gsm E nci Dozens described many circuits Plus Call hacked and countermeasures Includes the Bridging Heads amp Cans ptocom 3rd lans for your own Persona Pocket Paging Taree transmitter and receiver Party and other methods more 29 HACKING FAX MACHINES Eavesdropping on TV and computer video Describes in detail how Faxes are signals using an ordinary TV described in de hacked and countermeasures Includes Fax tail Range up to 1 KM Plans include our and protocols commo parameters compression Original Top Secret Van Eck designs _ 29 commands
114. STRUMENTS WES ON SCREEN GRAPHS YES ANALOG COMPONENTS COVER 100 DIGITAL COMPONENTS OVER 200 DEVICE MODELS OVER 4 000 MONEY BACK GUARANTEE 30 DAY TECHNICAL SUPPORT FREE Powerful Analyses DC OPERATING POINT YES AC FREQUENCY _ YES TRANSIENT YES FOURIER YES so ns Electronics DISTORTION YES 30 DAY MONEY BACK GUARANTEE Or b cenen ch VERSION 5 0 FOR WINDOWS 95 NT 3 1 k Upgrades from previous versions 79 INTERACTIVE IMAGE TECHNOLOGIES LTD 908 Niagara Falls E N 068 A L L 800 2 63 5 5 59 Ve North Tonawanda New York 14120 2060 Telephone 416 977 5550 l TRADEMARKS ARE PROPERTY OF THEIR RESPECTIVE HOLDERS OFFER IS tN U S DOLLARS AND VALID ONLY IN THE INTE IVE UNITED STATES AND CANADA ALL ORDERS SUBJECT TO 15 SHIPPING AND HANDLING CHARGE Fax 416 977 1818 Internet http www interactiv com CompuServe 71333 3435 BBS 416 977 3540 E mail ewb interactiv com CIRCLE 13 ON FREE INFORMATION CARD MARCH 1997 COVER STORY A GERNSBACK PUBLICATION WU HEME LW a 39 Build an Alphanumeric Pager Decoder This innovative device lets you view digital pager messages right off the airwaves Just connect the circuit to a scanner radio and your computer load up some special software and you can be cer tain your beeper is grabbing all the messages that it should Alan Secure berpa Pog eed poe D Jones ree web erT eed mid he oe PD CONSTRUCTION 45 Build an Electronic Parrot Having a parrot repeat what you say can be a
115. Sd1UdIOa y JeiNdog 7661 yasey WO 07 i Sal CONVERTERS AND DESCRAMBLERS WE CARRY A FULL LINE OF i CONVERTERS AND DESCRAMBLERS COMPATIBLE WITH MOST MAJOR BRANDS INCLUDING e Scientific Atlanta e Jerrold Tw e Tocom e Zenith e Pioneer 30 DAY MONEY BACK GUARANTEE BEST PRICES FREE CATALOG ALLSTAR ELECTRONICS 800 782 7214 HOURS 9 6 M F 10 3 Sat EST It le not the intent of Allstar Emonice to So co cn ratio operator Anyone implying theft of assistance AH brand names are registered oe i aie of their respective owners amp are used for refere ag SR i 3 Queens Bivd 465 Forest Hilis NY 114375 NO INSIDE CRYSTAL SETS An easy to read book on crystal set theory Riian and construction opens vistas for novices and pros alike Build radios like Grandpa did do it better and know what you are doing The Crystal Set Handbook published by The Crystal Set Society is an authentic guide on the topic To order The Crystal Set Handbook send 10 95 plus 4 00 for shipping in the U S and Canada only to Electronics Technoiogy Today Inc P O Box 240 Massapequa Park NY 11762 0240 Payment in U S funds by U S bank check or International Money Order Please allow 6 8 weeks for delivery PHILIP N ANDERSON EXCITING March 1997 Popular Electronics ALL RIGHT ALREADY so U S Savings Bond isn t the most exciting thing in the world
116. TR gt 42 lt TABLE gt 43 lt A HREF TOP gt Back lt A gt 44 45 46 lt H3 gt lt A Name ShareWare Sites gt ShareWare Sites lt A gt lt H3 gt 47 lt A HREF TOP gt Back lt A gt 48 49 lt H3 gt lt A Name Other Sites 1 gt Other Sites 1 lt A gt lt H3 gt 50 lt A HREF TOP gt Back lt A gt 51 52 lt H3 gt lt A Name Other Sites 2 gt Other Sites 2 lt A gt lt H3 gt 53 lt A HREF TOP gt Back lt A gt 54 55 lt H3 gt lt A Name Other Sites 3 gt Other Sites 3 lt A gt lt H3 gt 56 lt A HREF TOP gt Back lt A gt Dit 58 lt H3 gt lt A Name Other Sites 4 gt Other Sites 4 lt A gt lt H3 gt 59 lt A HREF TOP gt Back lt A gt 60 61 lt H3 gt lt A Name Other Sites 5 gt Other Sites 5 lt A gt lt H3 gt 62 lt A HREF TOP gt Back lt A gt 63 64 lt H3 gt lt A Name Other Sites 6 gt Other Sites 6 lt A gt lt H3 gt 65 lt A HREF TOP gt Back lt A gt 635 67 lt BODY gt 68 lt HTML gt played depending of course on the type of tag I ll provide more HTML details next time but by studying the listing you can probably figure out how to cus tomize the page yourself In the mean time here are a few hints to help you get started with HTML 1 Tags usually come in pairs e g lt HTML gt and lt HTML gt 2 Tags containing A HREF are reference tags which speci
117. Tektronix 465B 100 MHz 699 00 Tektronix 475 200 MHz 799 00 Tektronix 475A 250 MHz 899 00 e The Industry Standard of Oscilloscopes e Dual Channel Calibrated Delayed Sweep e Professionally Refurbished e Aligned amp Calibrated to Original Specifications 6 Month Warranty The Longest Available Model OS 9100P 899 00 Full 100 MHz Bandwidth e Dual Channel High Sensitivity e TV Synchronization Trigger FREE SHIPPING Calibrated Delayed Sweep ANYWHERE IN THE U S o Includes Two Probes 2 Year Warranty a LOWEST PRICES EVER gt BK PRECISION New Fluke Muttimeters amp TEKTRONIX OSCILLOSCOPES He maxtec INTERNaTiOnM cone Model 4040 499 00 The Yy in Multim Texrronx TES Senies 20 MHz Sweep Function Generator Fluke Model 87 285 00 0 2 Hz to 20 MHz 5 digit LED Display i e AM amp FM Internal or External Modulati Wi T E D e Sine Square Triangle TTL CMOS meaa t See us on the Web est quipment epot Burst Operation www fotronic com A FOTRONIC CORPORATION COMPANY e External 30 MHz Frequency Counter 1 800 996 3837 P O BOX 708 Medford MA 02155 SS ov 0 0 D TOLL FREE 1 800 99 METER urai afoti rotroniccom Low Cost CAD Software for the IBM PC and Compatibles Now In Windows iLSVI LV w Design amp Simulation OUT XIM JIL daas Bomwu e wean S6L 1 Amend WSdd Puarrgyeuayy e JSS PUNE Wd euarrgyeuoiny e Wa
118. The light emitting diode LED1 is on Q3 to save power whenever the chip is in listening recording or power e 4 INCHES nooman Fig 2 If you d like to build the Parrot on a PC board use this foil pattern as a guide SPKR1 Fig 3 This parts placement guide shouid make assembly on a PC board easier whenever IC1 is in the listening mode This LED will turn off during the record playback cycle or upon power down Construction The easiest way to build the Electronic Parrot is to use a printed circuit board as was done in the author s prototype If you d like to etch your own board use the foil pat tern shown in Fig 2 Or you can buy a pre etched and drilled board from the source mentioned in the Parts List Locate all the components shown in the Parts List If you re using a PC board refer to the parts placement diagram shown in Fig 3 to make as sembly easier Begin by soldering two PARTS LIST FOR THE ELECTRONIC PARROT SEMICONDUCTORS ICI HT8656A voice recording playback controller integrated circuit IC2 81256 256K x 1 dynamic RAM integrated circuit IC3 LM386N audio amplifier integrated circuit QI 2N4403 PNP transistor Q2 Q3 2N4401 NPN transistor Di 3 6 volt Zener diode D2 5 6 volt Zener diode LEDi Light emitting diode any color RESISTORS All resistors are Y watt 5 units Ri 10 ohm R2 R3 100 ohm R4 470 ohm R5 R6 1000 ohm R7 1500 ohm R8
119. This 3D flight simulation game features 360 degree movement tight controls grueling combat action and terrific special effects There is also a plot An international crime organization with the aid of several countries has built a powerful military force You assume the role of a Naval fighter pilot a team member of an elite air squadron who is assigned to respond to classified international missions You can select from various types of fighter planes as you go off to save the world from destruction There s no need to fly off unprepared however A training mode allows you to build the skills needed to tackle the scenario mode where you ll find air to air air to sea and air to ground assaults Epidemic And you thought your real life was bad In Epidemic the sequel to Kileak The DNA Imperative a deadly virus has forced what s left of the human race to live underground A life support system controlled by a computer keeps living conditions comfortable But the population is tyrannized by a dictator who uses the guise of population control measures to obtain superior DNA samples with which to create a master race As a member of the only group to stand up to the tyrant you must save your captured leader find a cure for the virus which has infected your girlfriend and destroy the dictator s regime Along the way you encounter a variety of enemies each equipped with an arsenal of weapons movement pat
120. a matter of minutes Besides reaching the car before it becomes a victim of a chop shop police can often catch the car thief in possession of the vehi cle Chop shops are common threats because most professionally stolen vehicles are taken for parts individual parts are worth about three times a car s value if it is sold intact RESCU Most 911 dispatchers agree that many times drivers reporting emergencies via cellular phones cannot provide their location This is not surprising since calls are often made under the stress of an accident breakdown or other emergency in deed the Federai Communications Commission FCC notes that the abil ity of emergency service personnel fo respond is seriously hindered be cause ceilular phone callers to 911 do not always know their location Fords Remote Emergency Satellite Cellular Unit RESCU offered on the 1996 Lincoln Continentals solves this probiem by tracking vehicle location and putting a driver a mere touch ofa button away from roadside medical police or fire emergency assistance RESCU is part of the optional Personal security Package that also includes a voice activated cellular telephone and Ford s JBL audio system RESCU uses a pair of buttons mounted in the Continentals over head console a Global Positioning System GPS receiver in the trunk and a celiular telephone One button is marked by a tow truck symbol and the other has an ambulance icon In either ca
121. a problem with the detector that was not mentioned in Gizmo The unit s display cannot take heat This is an automotive gadget that says in its instructions not to allow it to remain in a closed car On a typical day last summer with the unit concealed between the seats the display over heated and now have no display at all Of course the display can be replaced but for nearly the price of a brand new detector still find it surprising that an auto motive unit would require the user to take it out of the car every time you park H P S Hackensack NJ AN INTERNAUT SPEAKS Thanks for bringing monthly Internet coverage to Popular Electronics in Net Watch and for continuing to pub lish articles that deal with its resources I m new to the Net and appreciate hav ing information on it within the pages of my favorite magazine was surprised to learn at first just how much was available online of interest to electronics hobbyists and indeed of interest to just about every one It s great that the magazine that brought us the first computer informa tion in the 70s is keeping up with the times with the Internet Keep up the good work and thanks for a great magazine M B New Orleans LA THANK YOU Popular Electronics readers are the greatest Your response to my plea for a 185 chip has been heart warming You have boosted me from the depths of apprehension to a restored peace of mind Many thanks for yo
122. ached shop the same length used a chime for each setting them at different tones hope this circuit is of some value as it needs no current or voltage source other than its own Edward B Worman Roscommon MI l m definitely going to add the audio transformer relay circuit to my secret recipe book never thought to power a small circuit from an audio trans former before EXTRA BELL The enclosed circuit see Fig 7 is offered as a possible contribution to your Think Tank section Initially thought of it as a construction project but realized it may not appeal to a broad readership Basically it allows a remote bell to be powered from an existing doorbell circuit without tearing out walls to access the wiring between the door button and chime Only the doorbell transformer must be accessi ble and they usually are When the front or rear bell is activat ed return current flowing through the common circuit creates a voltage drop across the two resistors Depending on its direction it activates either Q1 or Q2 after a brief delay caused by the charg ing of C1 That diverts current briefly to the new chime which sounds off The device can be housed in a small metal box such as a 4 inch junc tion box that s what the dashed box in the diagram represents Variations on the circuit will allow the use of a piezo electric alarm or Special purposes can be accommodated since the circuit essent
123. age to be displayed on the pager All the data codewords for a message are transmit ted immediately after the address co deword without regard for frame number The message ends when an other address codeword or idie co deword is transmitted Bits 2 through 21 of a data codeword contain the actual message data Bits 22 through 31 con tain the error correcting redundancy bits corresponding to a BCH 31 21 code Bit 32 contains a simple parity bit that causes the entire codeword to have even parity Table 1 Code Character o000 0 0001 my ae 00 1 0 ee 0011 po 0100 4 0101 T g 0110 a E OITU e l M 1000 8 1001 o g 1010 space 1011 CEs 1100 space Message data may be defined as ei ther 4 bits per character or 7 bits per character Originally the function bits in the address codeword were to be used to distinguish these message formats but there is now no universal standard Usually the pager itself receives only one of these formats and the paging terminal must be configured appropri ately Reliably selecting the correct for mat for decoding requires prior knowledge of the pager type Generally numeric only pagers use the 4 bits per character format while alphanumeric pagers use 7 bits per character even for numeric messages Message characters are packed into the 20 bits available in each codeword with the result that there are
124. ague City TX 77573 3438 Tel 800 356 7047 Fax 713 332 4730 double sided etched and drilled PC board with matching plastic case 25 00 kit of parts including pre programmed PIC16C54 no board or case 35 00 pre programmed PIC16C54 only 11 00 When ordering by mail add 5 00 shipping and handling to all orders Texas residents please add an additional 7 25 sales tax Visa MasterCard American Express and Discover cards will be accepted A floppy disk containing the AccuPage Radio Monitor program will be included free of charge with all orders e S91u01 98 3 JeiNdog Z664 Yosey amp i March 1997 Popular Electronics Ja NO gram we recommend a 33 MHz 486 as a minimum Circuit Description The schematic for the Decoder is shown in Fig 1 Basically the circuit consists of four blocks the power supply input signal processing Schmitt trigger and dig ital sampler UART All necessary power is drawn from the handshake lines of the serial port itself The request to send line pin 4 of 01 provides negative voltage and the data termi nal ready line pin 20 of S01 provides positive voltage software must set these outputs appropriately Reg ulator C3 creates a 5 volt logic supply for microcontroller IC1 The RTS line negative supply doubles as a reset control for IC1 when it is set momen tarily positive while the data output line from the PC serves as a separate negative supply to produc
125. ail at peeditor gerns back com or by sending snail mail to Net Watch Popular Electronics 500 Bi County Blvd Farmingdale NY 11735 E lOltolo 10001 10i oo ioio loniojo You must have skipped a step Buyers Budget Books Better Buys word fortune Name City NW1 BP294 A cise to Microsoft 6 95 In the shortest and most way you can use the processor to advantage edit print and save documents It goes on to explain how Works can be used to build up simple Spreadsheet examples edit them save them print them and retrieve them It informs you how to Create simple macros and enables you to simplify long repetitive tasks and to customize the program to your own needs BP349 Practical 5 95 If you shun opto electronic projects for lack of knowledge this is the book for you A bit of introductory theory comes first and then a number of practical projects which utilize a range of opto devices from a filament bulb to modern infrared sensors and emitters BP350 Electronic Twenty novel electronic board games that you can build from the plans in this book Whether you are interested in motor racing searching for buried treasure on a barren island or for gold in Fort Knox spinning the wheel of something for you to build and enjoy BP351 WordPerfect BP388 Why Not 6 95 Find out how to Set up and organize groups of progr
126. alling the electrolytic ca pacitors and transistors It may be necessary to bend the leads of the transistors to fit the PC board A special note on transistor Q3 The 2N4401 specified in the Parts List can switch up to 600 mA of current for powering the LM386 amplifier Other common NPN transistors such as the 2N3904 are rated at 200 mA and can not be used in this circuit or IC3 will oscillate and give a distorted output Now solder sockets for IC1 IC3 to the board If you use the switch spec ified in the parts list for 1 it can be soldered directly on the printed cir cuit board as shown in Fig 3 The elec trect microphone is polarized and will not work if installed backwards Use very short wires to attach it as close to the PC board as possible Before continuing clean the foil side of the PC board with alcoho or flux remover Then wire the speaker and battery connector to the board as follows Cut 2 pieces of 26 gauge wire about 4 inches long and strip 4 inch from each end Solder a wire to each terminal of the speaker and then to the printed circuit board Next attach the red and black wires from the battery connector to the PC board observing the polarity shown in Fig 3 Now locate the HT8656A inte grated circuit 1C1 In addition to the source mentioned in the Parts list the HT8656A IC is also available from All tronics 2300 Zanker Rd San Jose CA 95131 please contact them for more information Since IC1
127. alls longwinded kids e Control up to 8 appliances in your home 4 Re direct costly toll calls from em 10 00 1 Shoots flaming ball two sho TELCONS Plans credit to pe 3 Mi Voice Transmitter Ultra Sensitive Mike y nia 4 Crystal Clear Tunes 80 130 MHz Tape X4 Check Local Laws before nis l Pame ee o Us TAP30X Ready Drop in Imi Telephone Transmitter Easily tunable over FM radio Never ir 5 battery DROPIN Kit Plans IMIND CONTROL Places subjects under your i control Programmable audib amp visual stimuli with biofeedback Induces Strange amp bizarre halucinations without drugs Caution not FDA aiii MIND2 Plans te es MIND2K Kit and Plans MIND20 Assembled Unit Sad Ultra Ear 4 20 dish uses satellite 4 3 technology to capture 15 00 1 8 50 al f og gt AL LA g Lasers Tesla Ions Anti Gravity Magnetics amp More i 4 Anti Gravity Rail amp Coil Guns Mass Warping Levitation Research Exploding Water Propulsion Drivers Lattice Snapping EMP etc Loss less Energy Charger HEP10 Lab Assembled to your spec s i ave call or fax for jin San Solid S Siak Tesla Coil Generate fiery electrical Se gt plasma discharge z objects without contact ll f Experiment with electrical and mechanical 3 Powers light and fields TCL5 Plans 4 Electronic Hynotizer 4 Con
128. ams and data files and change the opening logo use the Control Panet to personalize your screen savers and wallpaper files manage the DOS prompt and transfer your customization files to a new Windows installation In DOS you discover how to Write batch files and create specialist programs using the debug program design professional looking menus and more Con Introduction Works A Concise Introduction to Microsoft Works effective M TARAS P A COE to type Opto Electronic Board Games or doing a musical quiz there Personalize Your working environment Address __ Projects 6 00 iS 6 Explained 6 95 This is a practical hands on book and the routines described will help you get the most out of WordPerfect 6 The book explains the hard ware requirements for the package and steps you through a standard installation It guides you through the WordPerfect program environment to enter edit and enhance text and shows how to get the best trom the three different operating modes depending on the type of PC you are using The formatting codes button bars ribbon tabs graphic manipulation and styles will no longer be a mystery PC use ELECTRONIC TECHNOLOGY TODAY INC P O BOX 240 Massapequa NY 11762 0240 State Zip Allow 6 8 weeks for delivery BP367 Electronic Projects for the Garden 6 95 Electronic
129. and One is an unlicensed service under Part 15 of the FCC Rules and Regulations while another is a small ham band recently allowed by the British for their hams VLF AND LF At one time the VLF and LF bands were all that were available for any kind of reasonable communications These bands are those frequencies below the 540 kHz lower end of the AM broadcast band The LF bands are roughly 100 to 540 kHz while the VLF bands are from about 5 to 100 kHz Below 5 kHz are the ELF extremely low frequency and what call ULF unbelievably low fre quency bands 1 750 METERS Part 15 of the FCC Rules and Regulations allows operation on many bands on a non interference basis of transmitters not exceeding one hun dred milliwatts 100 mW into an antenna not longer than 10 feet long that 10 feet by the way includes the wire in any loading coils The 160 to 190 kHz 1 750 meter LF band is used for communication using these low power levels There are no call signs assigned by the FCC so users of 1 750 meters tend to make up their own usually their initials Many users of 1 750 meters oper ate beacons that can be detected with skill and difficulty at times Users report on hearing the various beacons and specialty or club publi cations will publish lists of those heard and when OMEGA LORAN C Ham Radio BY JOSEPH J CARR 10 14 60 100 145 WWVB 280 500 540 FREQUENCY kHz Fig 1 T
130. ards Design these fans into power supplies computers or other equipment requiring i ite EACH additional air flows for heat removal CATNO 100 These fans are regular Circuit Specialists CSD 4010 12 9 88 6 38 a we stock items they are not surplus CSD 6025 12 9 38 5 91 i J CSD 8025 12 8 88 rer ape pee f CSD 9225 12 8 95 6 14 NDUSTRY BEST PRICING CSD 1225 12 11 45 8 96 7 82 6 85 Specifications RATED START INPUT STATIC DIMENSIONS VOLTAGE VOLTAGE CURRENT AIRFLOW PRESSURE SPEED NOISE LEVEL CAT NO MM V V A CFM INCH H O RPM dB WEIGHT 9 CSD 4010 12 40x40x 10MM 12 7 0 06 5 1 0 19 5 500 26 20 CSD 6025 12 60x60x25mm 12 5 0 13 13 7 0 165 4 500 28 65 CSD 8025 12 80x80x25MM 12 5 0 16 37 8 0 177 3 000 31 80 CSD 9225 12 92x92x25mm 12 5 0 32 42 0 18 2 800 37 95 CSD 1225 12 120x120x25mm 12 5 0 35 62 0 180 2 500 42 135 e SOLDER SOLDER e CCD Camera IR Responsive As Low As Beti e SOLDER SOLDER e This black and white monochrome CCD Cam ae Westockhigh quality 60 40 Sn Pb 03 1 ai and 63 37 031 diameter Thisis prime JIS regular stock item it is not Left overs Rejects or Surplus and you can buy it from us at a fraction of the price that i you are used to era is totally contained on a PCB 70mm 7 x 46mm The lens is the tallest compo TES nent on the board 27mm high from the back of the PCB and it works with light as low as 0 1 lux If is IR 4 Responsive for use in total dark
131. arge edgeview meter move OSS of tg BSN noe DRIVE CABINET W SUPPLY ment 2 75 X 0 8 tace amp purchase of this twist on co ax Qp connector for RG 6 cable PP Scale is labeled Attractive heavy gauge gray BEATS MINUTE and is cali plastic cabinet designed brated from 50 150 It can be easily removed Special pricing while 100 for 15 00 e za Ken An to hold a 1 2 height or reversed to create a blank scale The s fs SSSsa_ gt q CD ROM drive black bezel is 3 53 X 1 33 and can be the supply lasts CAT FTO 56R power supply IEC power mounting plane 2 75 X 1 18 X 2 18 SPECIAL PRICE p r BI COLOR LED A niet jack on off switch cooling Solder lug terminals 50 5 each RED GREEN diffused fan LED indicator DB 15 connector and two RCA x T 1 3 4 5mm Three Legs 35 jacks 10 43 X 9 75 X 2 2 overall size Drive CAT MET 47 Goito cathode opening in front of case is 5 87 X 1 68 IEC r S VHS VIDEO CORD P each power cord not included CAT LED 63 4 500 each 100 for 29 00 1000 for 250 00 CAT MB 53 Marquardt 1050 0141A USED 66 s HI 8 VI DEO CA SSETTE Small normally closed switch rated 2 amps 00 10 for 25 00 125 250 Vac Prepped with 5 long wire leads 300 100 for 150 00 M T and 2 contact socket connector Body Op quality meta IIZ Tar size 0 78 X 0 4 X 0 25 UL and particle 120 minute video SA CSA
132. by its distinctive sound just use the search mode on your scanner in the 929 to 932 MHz range About 90 percent of the signals you hear will be POCSAG at one of the three standard bit rates see the POCSAG Messages box for more in formation SU0IOa Q JEINdOY 7661 YQeW 39 H2 J2 AUXILIARY R17 SPEAKER 4 22K OUTPUT IC3 J1 R18 LP2960CZ 10K o pe O IC2 a IC2 c 1 4 LF444CN 1 4 LF444CN March 1997 Popular Electronics amp Fig 1 Here is the schematic for the Alphanumeric Pager Decoder Many sections of the circuit take their power from two pins of a PC serial port through DB 25 connector SO Regulator IC3 also converts that power to a 5 volt source for use by other parts of the circuit Using Your Scanner A perfectly de modulated paging signal should ap pear on an oscilloscope as a series of rectangular pulses of varying width squarewaves This signal exists at some point within the circuitry of any radio receiver Unfortunately most low to moderate cost scanners were designed specifically to listen to voice transmissions As a result that nice clean squarewave passes through several stages of lowpass and high pass audio filtering to optimize the sound quality from the speaker The result is that the signal available at the external speaker or earphone jack bears little resemblance to the origi nal source One of the functions of the De coder is that of reconstructi
133. can Gamage or cut the wires If you are willing to do so it is best to use a small file or Dremel tool to cut a small notch in the edge of the case to allow room for the wires Re connect the battery pack insert it into its compartment and replace the battery cover Use the 3 5 mm two plug cable described earlier to connect the new in line jack to J1 of the Decoder Be sure that the pins on headers H1 and H2 are not installed Follow the setup procedure de scribed earlier in this article for de modulator discriminator outputs Note that the volume and squelch controls of the SC 150 have no effect on the demodulator output signal An auxiliary speaker will not be needed in this case since the unit s internal speaker will still work S INTELLIGENT MICROMACHINES Continued from page 59 process forms vertical axles for gears and elastic supports for the engine Additional layerings and removals of the oxide free the gears and linkages During these steps researchers add a hard smooth substance silicon nitri de which functions as a kind of grease to permit the gears to rotate more freely in the final step hydro fluoric acid is added to remove all the temporary supporting layers of silicon dioxide Gear Systems Micro motors consist of two tiny silicon combs separated by a shuttle The edges of the shuttle form combs with teeth that interdigi tate with those of the stationary combs These stationary combs ener gize
134. cations 7 25 This book explains PC specifications in detail and the subjects covered include the following Differences between types of PC XT AT 80386 80486 Pentium etc math co processors input devices keyboards mice and digitizers memory including both expand ed EMS and extended RAM RAM disks and disk caches floppy disk drive formats and compatibility hard disk drives and display adapters CGA Hercules super VGA etc BP298 Concise Intro to the Macintosh System and Finder 6 25 Although the Mac s WIMP user interface is designed to be easy to use much of it only becomes clear when it is explained in simple terms The book explains The System and Finder what they are and what they do how to use the System and Finder to manipulate disks files and folders configur ing and printing files from the Finder getting the most from the system utility programs and running MultiFinder BP301 ANTENNAS FOR VHF AND UHF 6 00 From installing a TV or FM antenna to setting up a multi antenna array for shortwave listening or ama teur radio this book explains the essential basics of VHF and VHF antenna operation and installation In easy to understand terms it helps you und rstand how antennas work the advantages of different anten na types and how to get the best performance out of an antenna BP316 Practical Electric Design Data 7 95 A builder s bargain book a comprehensive ready reference manual for
135. cquisition products personal comput ers and computer parts plus much much more FAX us your name and address or call 800 811 5203 ext 5 to leave a message on our Catalog request line S91U01 99 3 JBINdOY Z664 YOJEW wt March 1997 Popular Electronics Kaen y Digital And Analog Circuit Simulation Software Finally an easy to use simulator great for Students Engineers Technicians Hobbiests LogicDesigner CALDWDIG_AD CXT c Em FA os Simulation Qptions mon 5 prany Hg a 1 d ni d l D FA sa vase g LQG Lhe E B y a a i a or lt p eke vibo Van L 1 rhe verze Loge beara ig CALDIDIG_AD CKT t 1070 1080 ire a i g Automatic Glitch detection warns of potential circuit problems r Symbol Editor to design your own devices and sub circults Bs Analog Digital Libraries hundreds of devices 74XX 74XXX r Advanced Schematic Capture Zoom in out cut copy paste CMOS MUX FFs one shot tri state RAM ROM Voltage and drag drop Multiple Fonts Connectors BUSSES rotate flip Current controlled switches BJT GaAs MOS DIODE etc devices rules check Powerfull Berkeley Spice Analysis Capability AC DC r interactive simulation with multiple output windows and timing TRANSIENT POLE ZERO NOISE TRANSFER FUNCTION diagram allows you to see any signal by simply clicking on the wire OPERATING POINT and more even during simutation ra
136. d below the tip of Scuth America At that extreme latitude it is without a doubt the most southerly SW Station on the air today The polar station is sometimes heard as far away as the United States and Canada on its frequency of 15 476 kHz That s an impressive signal A longtime DXing friend Gabriel lvan Barrera writing from Argentina provides some interesting background about this very fascinating SW radio operation Radio Nacional Arcange San Gabriel he says is operated by Argen tine army personnel headed by Lt Col Luis Alberto Dupuy who also is the commander of the Esperanza military base a remote outpost of just 14 build CREDITS Bill Bergadano NJ William McGuire MD Ed Newbury NE Dan Ziolkowski NY North American SW Association 45 Wildflower Road Levittown PA 19057 aes Bruckner is LRA 36 RADGO NACIONAL ARCANGEL SAN GABRIEL UBICACION GEOGRAFICA Lat 569 24 Sur Long 53 59 Oeste FRECUENCIA 6030 KHz Apartado Postal 9411 Buenos Alres CONFIRMO SUS DATOS DE FECHA 03 Nov 79 MUCHAS GRACIAS BY DON JENSEN Dna i zj gun F Here s a verification card from Radio Nacional Arcangel San Gabriel operated from Antarctica by the Argentine military ings The staff is headed by two sergeants Jose Luis Amat and Luis Ramirez along with Vivana Lopez Adriana Arias and Mari Dupuy The station broadcasts Spanish tan guage programs just two hours a day 1800
137. d by on off electric pulses alter nate pulling the shuttle by an electrostatic attraction similar to that which causes a balloon to adhere to a shirt or dust to stick to a television screen An attached shaft turns a drive gear in a quarter of a circle during the shafts power stroke Another comb drive engine at right angles to the first is timed to turn the gear on the sec ond quarter of its rotation The two drives alternating their force turn re ciprocating motion into rotary motion to drive the gear completely around Efforts are underway to transfer the technology to industrial partners for large scale production That in effect makes the machines plug compati ble so other integrated circuits can be added to achieve novel uses The inexpensive manufacturing process can be used either fo pro duce thousands of units a day signifi cantly reducing costs for government and industrial manufacturers or to produce unique motors and circuits for specialized medical and research work E Arua Volunteers Welcome Entering the Information Age or those monitors who want to have virtually the entire FCC licensee database at hand there s good news Several CD ROM data bases now available allow the average hobbyist to have instant and convenient access to that mountain of valuable information All you need is a personal computer with a CD ROM drive And naturally you ll need one of the proper CD ROMs with FCC
138. d is published by Desktop Video Systems Box 668 Peck Slip Station NY 10272 Tel 800 247 6553 It can be purchased directly from the publisher with a credit card add 3 shipping NY residents must also add 2 31 sales tax CIRCLE 92 ON FREE INFORMATION CARD J I think you ll be surprised at how far m we ve come with our automation program soiuosoa 3 seindog 7661 Yosey March 1997 Popular Electronics Think Tank Doorbell Circuits his month s contributors have all provided circuits to enhance doorbells We ll get to their circuits after we continue our discussion of semiconductors We were up to PN junctions last time and posed the question What simple component is made of just a single junction Well a diode consists of one junction Its structure is shown in Fig 1A and its schematic symbol is shown in Fig 1B P MATERIAL LEADS N MATERIAL P SIDE N SIDE Fig 1 A diode consists of one junction its structure is shown in A and its schematic sym bol is shown in B The most typical use for a diode is to make sure current flows in only one direction For conventional current where we envision the flow of positive charges current flows across the junc tion from the P material to the N mate rial For the electron current view the flow of actual electrons current flows from the N material to the P material However for obvious reasons you can t easily force electro
139. d look like a store bought product Labeling a case can be a pain in the neck But found the easiest way in the world to make the labels for this project Because of how the LEDs are arranged was simply able to print a column of double spaced 11 point bold Arial text from a word processor With a piece of double sided tape that instant label went on the case like a charm You can do the same or experiment with your own label ideas Calibration ts easy to calibrate the line voltage monitor All you have to do is set potentiometer R16 so that the center LED LED4 turns on with an AC supply of 118 volts However if you dont have a varia ble AC source most people including myself don t then simply and care fully measure the voltage at the out let that your Monitor is plugged Into with an AC voltmeter Then adjust R16 so that the LED closest to that voltage turns on The brightness of each LED indicates the relative voltage within each step You now have a simple way of knowing what the AC voltage at any outlet in your home is E S31U01 98 3 weindog 7661 Y2JJEW an d March 1997 Popular Electronics 58 Learn how artificial intelligence is being brought to microscopic motors T makers of micromachines are not on mass producing their tiny creations naw they le making them srrart The inteligence added to the micsomachines ir tre form of integrated circuits will allow the machines to signal for
140. day it s hard enough for mem bers of the same generation or gender to reach a viewing consensus forget about finding one show to suit the disparate tastes of four or five people who just hap pen to be related by blood or marriage Before someone ends up in the ER or you re driven to Homicide why not con sider buying the kids their own TY so that they can play their videogames and enjoy their music videos without disturbing your peace And so they won t feel bad about surrendering the big screen set in the fam ily room to their folks why not buy them a TV that s specifically designed for video game playing According to Samsung its GXTV Model GXE1395 is the world s first per sonal game monitor designed to completely immerse the player in today s hottest video games To that end the 13 inch set features two wing like speakers that open out for game play and close up when not in use protecting the screen from the fallout of a teenager s room we suppose and a built in 15 watt subwoofer to boost the bass Preset audio modes such as warzone and roadrace are intend ed specifically to optimize the sound of games that fall into those popular catego ries There are also preset video modes for game playing and watching TV The GXTV more closely resembles a computer monitor than a traditional TV Like a PC monitor it sits upon a swivel base The tilt swivel stand can be moved 45 to t
141. dge Adventure Inc 1311 Grand Central Ave Glendale CA 91201 CIRCLE 66 ON FREE INFORMATION CARD multimedia But that doesn t mean it s outdated because Broderbund has recently released the latest generation of the software intended for ages 9 and up The traveling detective game now features 360 degree views from 50 countries and an extensive database of world information that helps kids with the game Newly available is Where in the USA is Carmen Sandiego which keeps the traveling within our own country s borders Both titles will sell for around 40 For children a bit younger ages 3 to 12 Broderbund has an ImagiMaker series of creativity software titles Kid Pix lets kids paint and draw and work on all sorts of art projects even add sound effects Kid Pix Studio goes a few steps further and also lets kids ani mate their creations The Amazing Writing Machine quite effectively lures kids ages from 6 to 12 into the world of creative writing illustrating and story planning a Parallel 75 ohm resistance For minimum loss of signal Fifteen years of micro electronic research makes conventional antennas a thing of the past This little box uses your hoine s electrical wiring to give non subscribers cable subscribers and satellite users better TV reception on local broadcast networks Technology corner Why don tconventional antennas work as well as the Spectrum Bandwidth of TV Signal 5 6 if Me
142. directly under ICs Solder those parts in place and clip their leads be fore you install ICs Do not use sockets under the ICs if you plan to enclose the circuit in the plastic shell there is simply not enough room It is also important to solder all TO 92 parts Q14 Q2 Q3 and IC3 with their plastic cases all the way down to the board again because of the shortage of room Jacks J1 and J2 and O1 go against the edge of the board and some of their pins solder to each side Be sure that SO1 is perfectly straight against the board edge or the connector shell will not fit The LED should protrude through a hole in the connector shell drilled or punched to accommodate it Also make sure that C9 is small enough to fit in the space allowed on the board Fig 4 Use this parts placement diagram as a guide when assembling the Decoder on a PC board Note that the parts drawn with dashed lines are mounted on the component side of the board Keeping all those assembly tips in mind this is the recommended se quence to optimize putting together the circuit board Solder the two 3 5 mm phono jacks to the board center ing them against the edge The ground lug on each will need to be bent about 45 degrees in order to touch the pads on the board Next mount the DB 25 connector to the board using only pins 1 and 13 Tem porarily place the board into one side of the plastic shell if things do not line up properly reheat the solder
143. ds are used as space fill ers in frames Corresponding to pager address groups in which there are no messages to be sent For the remainder of this discussion we will number the bits in a codeword from 1 to 32 where bit 1 is the high order bit and bit 32 is the low order bit This is non standard to most software pro grammers but it is the convention used in the official POCSAG document from British Telecom Bits 2 through 19 of an address co deword contain the high order 18 bits of the 21 bit address of a pager that is to be triggered The low order 3 bits of the pager s 21 bit address are implicitly de fined by the frame number from 0 to 7 in which the address codeword ap pears Bits 20 and 21 of an address codeword are defined as the function code The pager may ignore these bits or it may use them to determine whether to decode the message that follows as 4 bit or 7 bit data and or it may use them to select one of several different alert sounds Bits 22 through 31 contain the error correcting redun dancy bits corresponding to a BCH 31 21 code more on that later Bit 32 contains a simple parity bit that causes the entire codeword to have even parity The address of a pager also known as its Capcode is usually specified as a 7 digit decimal number ranging from 0000000 to 2097151 Each time an ad dress codeword is transmitted it is op tionally followed by one or more data codewords containing the mess
144. duol modular adaptor Transmits both sides of conversation to any FM radio up to 1 4 ile Snapkit t Uses phone line f and ierngueveocorvetey a CSN directly into telephone jack Records up to 12 hours of conversations on a single cassette phone is used Visa MC 800 594 1047 sansir 5 Free shipping Check MO Question line 972 258 7420 Seymor Radix inc Box 166055 E Irving TX 75016 _ Now you can visit us On the intemet at http Avwww why net nome si meee ee HOME AUTOMATION World s Largest Selection _ Hundreds of hard to find automation 10 and wireless control products Computer interfaces software development taols light ing control telephone systems security systems surveillance cameras infra red audio video control HVAC pet care automa tion wiring supplies books and videos and much mare used in your area i A Home Automation Systems Inc Questions 714 708 0610 Fax 714 708 0614 e mail catalog smarthome com http Awww smarthome com smarthome 24 Hours 800 762 7846 oo AL Quality Microwave TV 5 AIRE ABLE Ss a To ATV INTERNATIONAL BAND ifiers Antennas Books Components Filters Systems Video Products RF Frequency 1990 2700 MHz Cable Ready VHF UHF Outputs SASE For FREE Catalog or Send 1 fay 1 PHILLIPS TECH ELECTRONICS PO Box 8533 Scottsdale AZ 85252 2a a ang ar ORDER LINE 800 880 MMDS Complete Grid s s CATALO
145. e 400 NOW 1490 Save 300 Call or write for complete specs V 1565 100MHz w Cursors Was 1960 NOW 1595 Save 365 V 552 50MHz Was 1195 NOW 850 Save 345 V 555 50MHz w Cursors a oo eee cin Was 1375 NOW 975 Save 400 V 252 20MHz 4 194 oa 15 DAY MONEY BACK ry 150 W CARPENTER AVENUE GUARANTEE WHEELING IL 60090 FAX 847 520 9904 847 541 0710 http www elenco com cs_sales CIRCLE 32 ON FREE INFORMATION CARD FULL FACTORY WARRANTY PRICES SUBJECT TO CHANGE WITHOUT NOTICE SD1U0I 99j3 JEINdOY 76614 YosEy Fe wo March 1997 Popular Electronics h BeanFCC E ELECTRONIC TECHNICIAN sesesianras F t a Learn at home in spare time aa H No previous experience needed No costly school No commuting to class The Original Home Study course prepares you for the FCC Commercial Radio telephone License This valuable license is your professional ticket to thousands of exciting jobs in Communications Radio TV Microwave Maritime Radar Avionics and more even start your own business You don t need a college degree to qualify but you do need an FCC License No Need to Quit Your Job or Go To School This proven course is easy fast and low cost GUARANTEED PASS You get your FCC License or money refunded Send for FREE facts now MAIL COUPON TODAY Or Call 1 800 932 4268 Ext 240 COMMAND PRODUCTIONS FCC LICENSE TRAINING Dept
146. e These speak ers have the option of either stereo or hi fi sound Two speakers one Set on right channel and the other on left will give full stereo separation Or if you just want to add an extra speaker to a room set it On mono and listen to both channels on one speaker for hi fidelity sound Save 30 on additional speakers Our factory direct pricing allows us to sell more wireless speakers than anyone For this rea son if you purchase two or more Recoton speakers they ll cost just 99 each Add headphones save 100 For a limited time when you order two speakers and a trans mitter you can add wireless headphones for only 49 That s a savings of 100 off the system Enjoy your music anywhere risk free Experience for yourself the true freedom of these speakers They come with Comtrad s risk free home trial If you don t love both their sound quality and portability return them within 90 days for a full refund No Questions Asked All Recoton products are backed by a 90 day manufacturer s warranty Recoton transmitter 69 8 S amp H Recoton wireless speaker 429 9 S amp H Buy two or more speakers for just 99 each Wireless headphone system 449 9 S amp H Save 100 with special offer only 49 Please mention promotional code 2131 PL 10174 For fastest service call toll free 24 hours a day 800 992 2966 an z comtrad 2820 Waterford Lake Drive Suite 162 Midlothian VA 23113
147. e so we couldn t read the instruction manual or the on screen displays Nevertheless we were able to figure out most of the game play and even get respectable scores Like PilotWings for the Super NES the game requires players to progress through a variety of assignments and stunts to earn points for their pilot license certification There are three basic games The first requires you to pilot a hang glider the second a gyrocopter and the third is a rocket pack After you complete all three at one level you can proceed on to the next Each one gets progressively more difficult or even impossible for some people as the controls get touchier and the fuel supply runs down with great speed When in the hang glider the game starts CIRCLE 56 ON FREE INFORMATION CARD SPEEDO Fuki SEA LEVEL aso km h ase a Meters and gauges don t get in the way of the flying fun in this game out with you in the air The object is to land safely at the target Along the way how ever you try to fly through aerial targets collecting points If you need a little extra height you can fly through some of the updrafts produced by factory chimneys or through thermals over open fields With both the gyrocopter and rocket pack you start out on the ground You must suc cessfully take off hit the targets and land again safely The three dimensional worlds are ren dered quite nicely and fun effects such as
148. e computer the most popular application program today programming course and shows you everything you will receive as part of your training It s easy to cash in Look at some of the things professional f computer programmers do Wrote a C program Toll Free I 800 487 2100 to clean up a WordPerfect file edited the resulting Your free opportunity kit will be rushed to you file as data errors were found This work would take a If coupon is missing write to Foley Belsaw Company 6301 Equitable Road Kansas City MO 64120 trained programmer less than five hours to complete and Call or complete amp return this coupon to Foley Belsaw they could make over 200 for the work That s money you Institute 6301 Equitable Road Kansas City MO 64120 could be making and soon with training from the Q YES Rush me a free information kit on Computer Foley Belsaw Institute of Computer Frogramming Programming right away Dept 35327 Everything is included Othe carer courses A Locksmithing Dept 12916 We provide you with all the materials you ll need to Q Small Engine Repair Dept 52792 become a professional computer programmer You ll receive Q Saw amp Tool Sharpening Dept 21731 Q VCR Repair Dept 62607 37 lessons designed for you by the Foley Belsaw Professional gc Repair Debt 64504 P Staff Other valuable materials include a err eae in sear tart er OEO Q TV Satellite Dish Repair Dept 31379
149. e much smaller than expected And there is inches and weighs 19 pounds It con tains a single 5 1 inch woofer It looks great with its black matte finish and bass ports on the left corner Volume bass and treble controls are located on the front right Normally you would tuck a subwoofer out of the way some where like below your desk but the Bose bass module looks so good you ll want to display it right on top of your desk proudly set up the system in my office and first tested it with Led Zeppelin s Whole ao wea i Le F r _ L j a i r i F i i d fa i j d r i fa as i i al a a BY MARC SPIWAK TECHNICAL EDITOR WINDOWS MAGAZINE Lotta Love This speaker system can really crank and with no noticeable dis tortion at very high volumes A crowd quickly formed outside my office to see what was going on The next day test ed it with a digitally mastered classical CD Mozart s Eine Kleine Nachtmusik performed by The Academy of Ancient Music with Christopher Hogwood and was equally impressed by the sound Awesome And nobody believes how small yet powerful the drivers are even while they listen to them The system boasts a total power output of 90 watts That s 50 watts for the bass module and 20 watts for each driver The Acoustimass features active equalization a separately amplified bass channel automatic protection cir cuitry and automatic turn on shut off Dual
150. e names and addresses and phone numbers from our business card collec tions and address books into the organizer typing on a tiny cramped keypad We vz never made it past C This time however we have high hopes We a so have the Royal FL95 PC Orga nizer The pocket sized device has one of those midget keypads but we don t have to use it That s because the FL95 also has the Timex Data Link which lets us enter data on our standard PC keyboard and then download it to the organizer The Timex Data Link system was de veloped for the Timex Data Link Watch a wrist watch that doubles as a persona in formation manager PIM The technology transmits data from a computer to another device by flashing lines on the monitor 59 ON EREE INFORMATION Timex Data Link software is included with the organizer It works with Windows 3 1 or Windows 95 and provides basic functions for keeping track of names ad dresses phone numbers appointments anniversaries and miscellaneous lists When you are ready to send the data to the FL95 you simply click on the on screen Send to Device button and point the organizer at the screen The Data Link software is adequate for getting the information into the organizer but the last thing we would want to do is give up using our current PIM For tunately we don t have to because our current PIM of choice is Microsoft s Schedule Schedule supports the Timex Da
151. e spec would appear like this file C mydir mypage html That is the naming convention accept ed by Netscape Note that there are three forward slashes following file and there is a vertical bar after the let ter C The v bar stands for a colon Internet Explorer accepts the Netscape convention as well as a more natural looking file C mydir mypage html Most browsers provide a drop down box in which you can manually enter a URL or select a previously used one from a list Most browsers also have menu commands like File Open Location that accomplish the same thing HTML BASICS HTML stands for Hypertext Markup Language it s really just a way of SOIUOIOS Q Se NdoY 7661 YEW 69 March 1997 Popular Electronics LISTING 1 BASIC HTML FILE lt HTML gt lt HEAD gt lt TITLE gt My Favorite Sites lt TITLE gt lt HEAD gt lt BODY gt lt H1 gt lt A Name TOP gt My Favorite Sites lt H1 gt 10 lt H2 gt My TOC lt H2 gt 11 lt UL gt 12 lt LI gt lt A HREF Delphi Sites gt Delphi Site lt A gt 13 lt Ll gt lt A HREF ShareWare Sites gt Shareware Site lt A gt 14 lt LI gt lt A HREF Other Sites 1 gt Other Sites 1 lt A gt 15 lt Ll gt lt A HREF Other Sites 2 gt Other Sites 2 lt A gt 16 lt LI gt lt A HREF Other Sites 3 gt Other Sites 3 lt A gt 17 lt LI gt lt A HREF Other Sites 4 gt Other Sites 4 lt A gt 18 lt LI gt lt A HREF Other Si
152. e the nec essary voltage swing to drive the PC s data input at RS 232 levels Resistor R19 is a simulated speaker load for the scanner if needed Com ponents R18 and C10 form a lowpass filter to remove the 455 kHz IF compo nents and harmonics that are often present at discriminator Outputs Both y Pa e a INCHES Fig 2 This is the solder side of the Decoder circuit board e 3 8 INCHES Fig 3 Here s the component side of the board A properly assembled Decoder PC board will fit inside a DB 25 connector hood C9 and R20 eliminate any undesired DC components that may exist in the scanner signal One section of an LFAA44CN IC2 a is simply a buffer and gain block with two jumper selecta ble gain settings C2 c buffers the sig nal to the auxiliary speaker output Section IC2 d and its associated feedback Components form a Schmitt trigger with thresholds of ap proximately 0 1 and 0 1 volts Ca pacitor C5 section IC2 b and their associated resistors are set up to cause LED1 to flash on each negative transition of the Schmitt trigger output as an aid in setting the scanner out put level control Transistor Q2 con verts the rail to rail swing from C2 d to logic levels for input to micro controller IC1 a PIC16C54 The PIC contains on chip PROM that must be programmed with the small program whose source code and compiled hex file can be down loaded from the Cylex Internet site ment
153. easons these past three months For those of you who didn t happen to see the earlier issues the Star Roamer was a Knight Kit Allied Radio s house brand low end communications receiver that was a popular starter set for SWLs and would be hams in the mid 1960s My Star Roamer came to me along with the Heat Q Fiver and Holstrom Associates preselector that apparently had been used with it cour tesy of a sharp eyed friend who had spotted the unit in someone s trash During the time that the project was on the back burner at least man aged to order a copy of the original Star Roamer construction manual It includ ed a pictorial diagram Fig 1 and large schematic Fig 2 that will share with you this month The art will take up a lot of space so I ll have to keep my text quite short THE CIRCUIT As long as we now have the Star Roamer s schematic it s probably appropriate to review a few details of the circuit The set is essentially a con ventional broadcast superheterodyne receiver enhanced with shortwave and long wave bands and a few additional niceties of importance to the serious shortwave listener in Fig 2 V 1 6BE6 is the oscilla tor mixer otherwise known as the converter and V 2 6HR6 serves as the single IF stage Diode CR 1 is the detector and is followed by V 3 a 12AX7 dual triode which is connect ed as two stages of audio amplifica tion The audio output stage V 4 is either a 6
154. easy fast and rewarding to repair it yourself with the Electronics Repair Manual J Dozens of Fix It Yourself Projects for LJ CD Players O Amplifiers LJ VCRs L Car Radios LJ Televisions LI Home Appliances LJ Camcorders LJ AM FM Tuners C Computer Equipment L Thermostats LJ Fax Machines and more C Telephones Keep Your Skills Up to Date The Electronics Repair Manual and the Modern Manual Electronics Manual will be a valuable reference for years to come Supplements each containing over 125 pages add new repair projects valuable insights into new technologies diagnostic and repair techniques electronics projects and more schematic diagrams into your manual Just 35 each for Electronics Repair and 49 50 each for Modern Electronics plus shipping and handling Supplements are sent 4 5 times a year and are fully guaranteed Return any supplements you don t want within 30 days and owe nothing Cancel anytime Build lit Yourself as A A A Expand your knowledge while Sharpening your Skills F T Sut _ 7 a oe FE pma a E L ed 5 E i Gr a Egr ear j f pE i nS Ca F ina E A a oe a a Te F a my such as 0 C Simple Logic Probe L Multi Purpose Gas Detector C Digital Combination Lock C Radiation Detector C Portable Frequency Counter and many other projects A lifetime of exciting electronics projects e Complete project plans e Step by
155. ecise location or identity the appropriate address emergency service provider and the CMC notifies madicat police or roadside Source ADT Security Sysiems Rockwell Automotive Unlike RESC U the ADT Security Systems Rockwell Automotive Mobile Security Network can be added to any car This iilustration shows how it works point the location of the stolen vehi cle and call up all pertinent information year make Model color etc This information is then transmit ted to a local police department The computer can also fax a copy of a street map showing exactly where the vehicle is located If the car is Moving the monitoring station will keep police advised of location changes direc FOR MORE INFORMATION ADT Security Systems 300 Interpace Parkway Parsippany NJ 07054 1177 Audiovox Corporation 150 Marcus Blvd Hauppauge NY 11788 Lincoin Mercury Division Communications 301 Renaissance Center Room 2730 Box 43342 Detroit MI 48243 LoJack Corporation 9911 West Pico Blvd Suite 1000 Los Angeles CA 90035 S2RK Advanced Technologies 1 Holiday Drive Suite 530 Pointe Claire Quebec CANADA H9R 5N3 Rockwell Automotive 2135 W Maple Road Troy MI 48084 7186 tions and even ground speed of the vehicle Positional data accurate to 10 to 20 meters 33 to 66 feet is trans mitted every 10 seconds A con cealed panic button can be trig gered in the case of a carjacking or after an accident In Ca
156. ed data words In fact there exist products on the mar ket that do exactly this and the inge nuity that must have been required to write such software is something to be admired The disadvantage of this approach is that the software running on the PC must perform timing tasks at the sub millisecond level in a way that essentially prohibits operation under muititasking operating systems such as Microsoft Windows Such programs tend to run under MS DOS only and must own all the CPU time in order to function correctly The Decoder overcomes this disaa vantage by adding one more pro cessing step between the recon structed data stream and the PC serial port A Microchip PIC16C54 mi croprocessor is used to reformat the data into a form that is acceptable to a standard PC UART In order to retain the versatility and general ap plicability of this device for future ap plications in decoding other digttal data stream formats the embedded software for the PIC CPU operates sim ply as a constant rate sampler con tinuously taking samples of the state of the data stream at approximately 9600 samples per second Each time a group of eight samples has been accumulated the group is transmit ted to the PC serial port as a conven tional asynchronous byte including start and stop bits at 19 200 bps This amounts to four samples per bit at a 2400 bps incoming data rate more for lower rates which is adequate for purposes of so
157. ed fish as you explore a marine Canyon and invent your own language to communicate with the denizens of the deep You ll meet more than 120 varieties of sea creatures as you walk along the ocean floor build coral reefs and explore the sunken ships and other ancient ruins hidden throughout the exotic watery landscape You can play for hours without retracing your steps This is a pressure free gaming experience with no deadline or clear objectives past the joy of discovery The New Age soundtrack enhances the relaxed mood Beyond the Beyond Sony Computer Entertainment America s SCEA first role playing game for the PlayStation is Beyond the Beyond an adventure saga that leads players through a labyrinth of a storyline full of cunning knights dragons evil monsters fierce battles and magic spells In the Land of Quamdar an age old truce between good and evil ends and dark forces begin to rise from the depths of the planet A knight in training named Finn gets on the job experience as he and his trusty dragon Steiner lead a band of assorted good guys in the fight to banish evil from Quamdar It s up to you to develop their powers as you unravel the nonlinear storyline The 3D strategy adventure is intensified by the use of two rich perspectives a continuously evolving top down isometric view and a revolving 360 degree three dimensional view Bogey Dead 6 If you liked watching Top Gun you ll love playing Bogey Dead 6
158. edure described earlier in this article Note that plug ging in the cable will disable the SC 150 s internal speaker This config uration will allow you to decode 512 and 1200 baud POCSAG but not 2400 baud f you want to be able to decode 2400 baud POCSAG and decrease the number of errors at lower baud rates you will need to tap the scan ners unfiltered audio To do that you will need the 3 5 mm cable just de scribed a 3 5mm in line phono jack and a small amount of 26 gauge or smaller insulated wire Slide the battery cover downward and remove it Lift out the NiCd bat tery pack and unplug its connector from the unit Using a smail Philips screwdriver remove the four screws holding the back half of the case lift away that half Lay the unit face down on the table Using your fingers gently pry upward on the uppermost circuit board at the end nearest the battery compart ment This will disengage the dual in line 22 pin connector between the two circuit boards The upper board together with the plastic case top control knobs and antenna con nector can then be lifted away from the unit Flip over the board you just re moved Its bottom side will match the photograph shown in Fig 5 Cut a 6 inch length of 26 gauge or smaller insulated wire and strip approximately 32 inch of insulation from one end Carefully solder the wire fo the loca tion shown in the photograph Orient the wire so that it leads dia
159. een completely out of the public eye For the past few years the company has continued to sell its 16 bit games for the SNES con sole including a vastly improved Donkey Kong Country and has introduced some new portable games Nintendo has also been manipulating the 32 bit wars from _ the sidelines with strategically timed prod uct announcements Last winter promises of an early springtime release of Nintendo 64 at a lower suggested retail price than either Sega or PlayStation slowed critical Christmas sales of both 32 bit systems Despite the introduction of the two 32 bit systems video game system sales rose only slightly last year from 10 5 million units in 1994 to 14 3 million in 1995 sorry figures indeed when compared to the 27 million machines sold in 1992 All those potential buyers who decided to wait for the more powerful system had their patience sorely tested Nintendo 64 s CIRCLE 55 ON FREE INFORMATION CARD U S debut date was pushed back until autumn surprise just in time for the 1996 holiday season It remains to be seen if sales figures rise dramatically in re sponse That will be determined in part by the amount of available software After all it s always been the quality of the games that sell any given platform As we go to press a mere 35 shopping days until Christmas only three N64 games are available What good is a 64 bit machine if you don t have much to play on i
160. eers amp more 30 AY Et a AL SS es Now you can tune in your favorite cable TV programming and SAVE 100 S EVEN 1000 S i on premium CABLE TV EQUIPMENT All converters unmodified 800 899 5000 2125 S 156TH CIRCLE OMAHA NE 68130 Remote Automotive Engine Starters E PROTOTYPES Or large runs PCBs wave soldering cabinets and other metal parts silk screen printing plastic i injection xformer coil winding etc Assembly Start and stop the engine and honk the De f 3 i License Tou taan horn with a 2 channel key chain transmitter Wiring Very low prices Twin plant in Mexico We Warm up your car In the winter Cool it off in the Summer SmartStart R22 Time clock based Programe like a mcs 100 VCR The engine starts at the times you F Commerce ial set up to 4 start times per day Also set Radiotelephone Radiotelegraph 1 800 906 6664 the run time day and time E Ss eee EETA EE Ship to your door V amp V PH 713 537 7518 Fax Why Take Chances ESEE A aA ea E a a 011 525 361 5996 Discover how easy it is to Ji J pass the exams Study with the l most current materials available Our CONTROL YOUR WORLD l Homestudy Guides Audio Video l 1 S2Kg om HCN J or PC Q amp A pools make it so fast J WHOLESALE PRICES ba i O Or O a i i EWER E Sal o FE a e A a STARTING AS LOW AS 99 00 ry en Pies A
161. egular frequencies so he was thrown into a tailspin when confronted with this mobile tower that wasn t using any of the field s usual communications channels Manny asks if anyone has knowledge of this type of arrangement and the frequencies that might be used with it According to the Radio Monitors Newsletter of Maryland P O Box 94 Hampstead MD 21074 what Manny encountered is something known as Alr Boss It s a 26 foot portable air craft tower adapted for use with a trail er The Air Boss is towed around the country to air shows to serve as a temporary control tower and public announcement system It contains one UHF and three VHF aeronautic radios and a cell phone as well as other com munications a signal light gun and wind data instrumentation The Air Boss is privately owned and not operated by the FAA although cer tainly it is used with FAA permission Its frequencies will be different from show to show but the primary air operations are said to be on 123 975 MHz with a secondary frequency of 126 0 MHz Military aircraft communicate on 388 0 MHz Monitors have also reported it on 122 925 MHz the 121 MHz ground control frequencies and even 122 92 MHz 5 kHz off the authorized 122 925 MHz channel My personal guess is that it also operates on 123 1 MHz as that s a big air show channel BETWEEN A ROCK AND A HARD PLACE How many of you remember the olden days when scanners were fre quency
162. electronic enthusiasts with over 150 practical circuits It covers the main kinds of com ponents from pig tail leads to surface mount pin outs specs and type selection Basic units are defined and most used formulae explained Five additional sec tions are devoted to circuit design Covering analog digital display radio and power supply circuits BP319 Making MS DOS Work For You 6 50 This book could help you improve your system set up and provide you with a simple to use but pro fessional looking menu system The routines described will help you understand more of the work ings of MS DOS and help you get the most out of your computer in terms of efficiency productivity and enjoyment BP341 MS DOS 6 Explained 7 95 The book covers How the DOS operating system of your computer is structured so that you can understand what happens when you first switch on your comput er How directories and subdirectories can be employed to structure your hard disk for maximum efficiency how to use the DOS Shell program and much much more BP345 Getting Started In Practical Electronics 5 95 If you are looking into launching an excit ing hobby activity this text provides basic essentials for the builder and 30 easy to build fun projects with which every experimenter should toy Printed circuit designs are included to give your project the profes sional touch Total price of DOGKS wecesnl Av eoncsccnnwad ccshacceeee
163. em to track and recover a stolen vehicle Flashing lights on the display and an automated voice indicate that the message has been dispatched and helo is on the way If a tow truck is requested the panel displays the esti mated time to its arrival A cancel but ton will reduce false alarms According to ADT Security Systems their system can provide more relia ble service compared to a cellular phone based system Besides instant communications it is not prone to sig nal dropoff interference lack of coverage or busy signals the last thing you naed during an emergency ADT Security Systems is the largest provider of security services in the U S Offering continuous Monitoring of se curity systems to over 1 million cus tomers in North America and Europe including 700 000 homeowners As of August 1995 ADT coverage exists for more than 7000 cities and towns in the US and more are scheduled to come online over the next 18 months Initially the Mobile Security Network will be marketed to ADTs commercial customers and then will appear on the consumer electronics after market S9lU01 29 3 ueindog 7661 yosey Ja March 1997 Popular Electronics LoJack While there are several stolen vehicle tracking systems avail able in many metropolitan areas where car thievery is most prevalent the most popular by far is LoJack How LoJack works is demonstrated by the system in operation in Southern California In Los A
164. en the Spectrum Antenna interfaces with the AC line the signal is sent to its signal processing circuit It then processes and separates the signal into 12 of the best antenna configurations These specially processed signals route themselves into 12 sepa rate circuits The Spectrum Antenna includes a 12 position rotary tapping switch the Signal Switch control which gathers 12 of the best antenna configurations Signal search control For selecting multiple antenna configurations Y Resonant fine tuner control For dialing in crisp clear TV stereo reception elimi nates ghosting Dual outlets with surge protection For plugging in additional TV stere o equidment guarding against damage and surges The Signal Search offers varying antenna con figurations for the user to select from the best sig nals of all those being sent The signal then passes through the Spectrum Antenna s special Fine Tuner circuit for producing crisp clear reception Rural areas If you live ina rural area you may need to enhance the incoming signal most rural areas signals are weak making them harder to fine tune The Gain Booster is a high frequency signal booster designed to increase the output lev el of the signal entering your television It deliv ers a 10 fold greater signal which will bring richer color and a noise free picture By using the Gain Booster ail of the Spectrum s fine tuni
165. entions software claims design patents for computer icons and more The book discusses the changes in patent law brought about by the GATT trade agreement such as the Pro visiona Patent Application a new program that provides preliminary pro tection for an invention and gives the inventor a year to refine his or her ideas before filing a regular patent application The author a patent attorney and former patent examiner takes you step by step through the entire patent process He explains how to evaluate whether your idea will be a commercial success and how to document the invention process including the date of conception as well as building and test ing activities The book shows you how to prepare and process a full patent application and contains all the forms and instruc tions necessary to file for a patent in the United States Filled with clear exam ples explanations and illustrations the book also covers international patent protection opportunities marketing your invention and enforcing and maintain 10 ing your patent Patent It Yourself 5th Edition costs 49 95 and is published by Nolo Press 950 Parker Street Berkeley CA 94710 Tel 800 992 6656 Fax 510 548 5902 CIRCLE 90 ON FREE INFORMATION CARD THE INTERNET TELEPHONE TOOLKIT by Jeff Pulver Save a fortune on your phone bills every month by turning your PC into a phone and making your calls via the Internet All it takes to g
166. er and 4 woofer Plus auto matic digital lock in tuning guarantees opti mum reception and eliminates drift The new technology provides static free sound in vir tually any environment The speakers are al so self amplified they can t be blown out no matter what your stereo s wattage Plus the speakers will mute when the music stops playing so no noisy hiss is heard TECHNICAL SPECS Powered by batteries Improved audio circuitry Mutes when mustc stops to eliminate hissing All controls found on back Built in carry ing handle Turns itself off after 20 30 min utes of inactivity One transmitter any number of receivers The powerful transmit ter plugs into an audio out tape out or headphone jack on your stereo or TV component transmitting wire lessly to speakers or headphones The transmitter plugs into a standard outlet One transmitter will broadcast to any num ber of stereo speakers and headphones Since each speaker contains its own built in receiv er amplifier there are no wires running from the stereo 150 foot range Just imagine listening to your stereo TV VCR or CD player in any room of your home without running speaker wire Plus you ll never have to worry about range because the new 900 MHz technology allows stereo signals to travel distances of up to 150 feet through walls ceil ings and floors without losing sound quality Stereo or hi fi you decid
167. erimentation will determine the best location for the trigger points If your scanner has a discriminator or raw data output then you should by all means use it with the Decoder Most do not however So as we ll see later you will probably have to locate this unadulterated signal within the in ternal circuitry of the scanner A little work with a soldering iron can bring out an extra pair of wires or a jack r eg rrem providing the desired output Be cause of the audio filtering you can normally decode 1200 bps and lower transmissions but its pretty hopeless to extract useful data at 2400 bps without a direct discriminator output Just because you have an accu rately reconstructed binary data stream doesn t mean that the prob lem of interpreting pager signals is solved We could try level translating the signal to RS 232 voltages and feeding it into a serial port but the following must be considered 1 bit rates may change unexpectedly cind 2 POCSAG is a 32 bit synchronous format that is incompatible with the data input mechanism of the type of UART that is normally used in PCs There is some temptation to solve both of these difficulties by feeding the signal fo a handshake line of the serial port instead of the normal data line and using highly timing intensive software fo measure individual bit transitions in order to determine the current bit rate and extract the cor rectly synchroniz
168. ero padded original data and the gen erator The example of redundancy bit cal culation shown in Listing 1 is extracted from the British Telecom document It is set up to resemble the paper and pen cil long division procedure Note that all column operations are not subtrac tion but are instead exclusive or opera tions No carry bits propagate in either direction The full POGSAG codeword would consist of the 21 bits of data followed by the 10 redundancy bits followed by a parity bit Codeword 11010001011000100100011000110110 A receiving device of course must run the complementary procedure using the redundant information to cor LISTING 1 TrOLOOOTOILOOOTOO L000 TsO MLOTOOL 1101000101100010010000000000000 Ti 10d rOTOOL m ee RELIQCOTOOO TI LOT TOTOQI 11100001010 PT kOe TOOT 11000110100 11101101001 10101110100 11101101001 10000111010 11101101001 11010100110 11101101001 11100111100 11101101001 10101010009 11101101001 10001110010 11101101001 1100011011 rect erroneous bits Several different methods can be used to do this all are too involved to explain here A good reference work is the book amp rror Cor recting Codes Second Edition by W Wesley Peterson and E J Weldon Jr published by the Massachusetts In stitute of Technology Press Cambridge Massachusetts ISBN 0 262 16 039 0 Library of Congress 76 122262 It is possible to receive and decode POCSAG by
169. es pinhole camera w audio 199 hidden video electronic kits telephone recording systems 7 Hour 125 16 Hour 199 touch tone decoders scanners bug phone tap detectors voice disguisers telephone scramblers locksmithing tools and more Catalog 5 00 SPY OUTLET PO Box 337 Buffalo NY 14226 716 691 3476 7 16 695 8660 STARTA CAREER IN ELECTRONICS Accredited home study Re y pair install and service au dio equipment microwave ovens alarm systems small appliances and more For free career literature send or call CALL 800 223 4542 il 5 Name i Address i City State Zip Age Phone The School of Electronics Dept ELC341 S91U01 9943 seindog 7661 yosey Gases 6065 Reswell Road Atlanta GA eee al 101 March 1997 Popular Electronics B N Fixit Yourself e Hands on detailed troubleshooting instructions a Electronics Repair e How to primer for test equipment oscilloscopes Mong Manual frequency counters video analyzers etc se en mar e Schematic diagrams e Trouble analysis flowcharts e Preventive maintenance techniques e Safety precaution checklists e Comprehensive replacement parts list e Directory of manufacturers Leading Manufacturers Represented e Emerson Nintendo RCA Technics e Hitachi Panasonic Sanyo Toshiba IBM e Pioneer Sharp Zenith NEC e Quasar Sony and others It s
170. es down to in real life is that the PlayStation provides developers with enough power to create exciting three dimensional worlds and to populate them with characters that do more than move up and down and right and left Like the Nintendo 64 the graphics for PlaySta tion games are created from geometric shapes or polygons The PlayStation s d1U0I 99 Q UeINdOY 661 YOsEW N March 1997 Popular Electronics N g graphics processor can handle 360 000 flat shaded polygons per second or 180 000 texture mapped polygons per sec ond From those polygons developers are able to produce 3D settings and objects Texture mapping further enhances the re alism As a CD based system PlayStation has a huge storage capacity Each CD has 600 megabytes of space available of which game action rarely takes more than 5 Developers can use the remaining space as they see fit giving them much more free dom than when designing cartridge based games They can even add bits of memory intensive full motion video and CD quali ty digital sound to their games The main drawback to CD based games is that they don t provide instant access There s always that lag in play as you reach a new level and wait for it to be loaded When you re caught up in the game action even a few second s delay can be annoying The PlayStation console features a top loading disc holder at its center with the large round Power button to its left a
171. esearch 89 Basic Electrical Supply 111 Bell Merit e 112 32 C amp S Sales Inc c5 c6ccccschansccessosneee 98 Cable Discount 107 Circuit Specialists ccc0000 90 Cleveland Institute of Electronics 37 Command Productions 100 Comtrad Industries 7 15 15 Consumer tronics ccccccceeeecees 82 WSO Dalam eae aaan 97 173 Digi Key Corp ccccccsseeseeeees 5 EDE Spy Outlet eae ne 101 148 Electronic Rainbow 83 Electronic Technology Today 23 158 T Fluke oa tcaeeseeeont 9 Foley Belsaw ccsccssescenees 105 Forest Electronics 0 00000 82 Fotronic Corporation 96 General Device Instruments 89 Grantham College of Engineering 4 Greenleaf Electronics Inc 94 Home Automation Systeme 107 LEL eer eee erer arene re eres 112 Information Unlimited 88 Intelligence IN scseccesecens 111 13 Interactive Image Technologies CV2 Intronics Inc 88 Island LogiX Inc 92 Kableworks ccccsssssessossees 108 Free Information Number Page KDE Electronics 0 c008 101 Learn Ineens 21 Mana o eea A 94 142 MCM Electronics 0000 87 Mega Electronics 000000 101 147 _ Meende
172. esults mini mum req If you are getting readings but are unable to reduce the baa red percentage to a small value then approach from the other direc tion Set the Inverted Data checkbox to its opposite setting to trigger onthe overshoot as described earlier and increase the volume to a much higher setting Then decrease the volume in cremenftally searching for an op timum setting based on the Signal indicators The AccuPage Radio Monitor pro gram by default logs and displays all messages that it decodes If you would like to see only text messages or to filter the messages so that only those for particular pagers are log ged select File Search List from the menu bar A typical paging service might easily transmit 100 000 pages per day and the message log file generated by logging all of them will rapidly grow to a size of many mega bytes Troubleshooting The following are some of the most likely reasons why the device might not work properly 1 Connector problems at the scan ner output 2 Wrong COM port set up in soft ware 3 Inverted Data setting is incorrect 4 Computer is too slow use a 486 33 or faster 5 Weak or noisy radio reception 6 Wrong settings for pins in H1 and H2 7 The received signal is not direct FSK 8 Wrong scanner demodulation mode should be narrow FM 9 The received signal is not POCSAG there are other paging formats 10 Soldering problems
173. et started in Internet telephony is the information contained in this book and software like that which is presented on the included CD ROM The book reveals things that the phone companies would prefer to keep under wraps It explains just what you can do with Internet telephony and how to avoid some of the trouble spots of current Internet telephones t predicts what the future holds for this fast grow ing industry and discusses how other emerging technologies like video on the World Wide Web will fit in with Internet telephony The CD ROM lets you test drive all of the leading Internet telephone and broadcasting software It presents demo software including VocalTel s Internet Phone 3 2 and 4 0 Demo Ver sions and Internet Wave Voxware s TeleVox ToolVox NetSpeak s Web Phone FreeTel Communications Free Tel White Pine Software s Enhanced CU SeeMe for Windows and Macin tosh VDONet s VCOLive Video Player Telescape s TS Intercom IDT s Net2 Phone IRIS Systems IRIS Phone the beta version of IBM Internet Connection Phone and more The Internet Telephone Toolkit costs 29 95 and is published by John Wiley amp Sons Inc 605 Third Avenue New York NY 10158 0012 Tel 800 225 5945 Web site http www wileycom compbooks CIRCLE 91 ON FREE INFORMATION CARD THE LOW BUDGET VIDEO BIBLE Revised Second Edition by Cliff Roth Close to a third of American families own a camcorder
174. etscape and Explorer specifically tested it with Microsoft Internet Explorer 3 0 and Netscape Navigator 2 0 by the way version 3 0 is now available INSTALLING AND CUSTOMIZING Using any text editor e g DOS Edit or Windows Notepad enter the file shown in Listing 1 or obtain it from the Gernsback FTP site ftp gerns back com If you type it in yourself be very careful to enter all the special characters correctly or your page may display incorrectly or not at all Save the file in any convenient directory BY JEFF HOLTZMAN Open the file in your browser If all has gone well you should see some thing that looks like Fig 1 If not you should check your typing against the printed listing To use the page just click on a link Note that it has both internal and exter nal links External links take you to other Web sites Internal links allow you to jump around different portions of the page For example all those back links redisplay the TOC at the top of the page URL BASICS URL stands for Uniform Resource Locater it s the official name for an Internet address A URL typically con sists of an address preceded by a pro tocol spec usually http or file but possibly ftp or other designations A URL like the following loads a page called mypage html across the Internet from a site called mysite http www mysite com mypage html lf mypage htm were located on a local drive th
175. eu xg euisiny o WY eulerxgfeursrg o eso DC voNNoses ZH T ZHN 07 0 3s mng o WSJ Pusxgeussya o e Easy to use schematic entry program SuperCAD for circuit diagrams only 149 Includes netlisting bill of materials extensive parts libraries More parts and automatic wiring available in enhanced CAD package SuperCAD for only 249 e Powerful event driven digital simulator SuperSIM allows you to check logic aeu ey before actually wiring it up Works directly within the SuperCAD editor from a pulldown menu and displays results in logic analyzer display window Starting at 149 this is the lowest cost simulator on the market Support for PALs a larger library and a separate interactive logic viewer are available in full featured SuperS M for only 399 Library parts include TTL CMOS and ECL devices e Circuit board artwork editor and autorouter programs SuperPCB starting at 149 Produce high quality artwork directly on dot matrix or laser printers You can do boards up to 16 layers including surface mount Includes Gerber and Excellon file output Autorouter accepts netlists and placement data directly from the SuperCAD schematic editor e Low cost combination packages with schematics and PCB design 2 layer for 399 16 layer for 649 DOS version available Write or call for free demo disks WW M TALA 5415 136th Place S E BBellevue WA 98006 206 641 2141 BBS 206 641 2846 http www
176. fit Call STAR VISION DIRECT 800 899 9707 8am 10pm Pacific ELECTRONICS enterprises Home based Part Fuil time Comprehensive Guidebook 250 pages 19 95 24hr recording Faxback 800 326 4560 x145 EDUCATION LEARN IBM PC Assembiy Language Disk 5 00 Book 18 00 ZIPFAST Box 12238 Lex ington KY 40581 2238 FCC CET software General Radiotetephone CET preparation Five 3 5 inch diskettes Q A for mat interactive comprehensive EGA VGA Complete program 35 00 TUTOR TECH 170 roger Way 2 Sunnyvale CA 94087 408 1 EDUCATIONAL and how to videos Huge sele tion for children and adults Call now for free cata og TOTAL MARKETING SERVICES 1 800 9 7977 EXT 85688 REDUCE lightning damage to electronics Hurry before lightning season Send 5 00 to Li waa Crofton Ave Kannapolis NC so1u0sjoa 3 JENdod 661 YEW oh qw Popular Electronics March 1997 fa ADVERTISING INDEX Popular Electronics does not assume any responsibility for errors that may appear in the index below Free Information Number Page 25 Ace Communications 82 Aegis Research Canada 100 AES o a E A 89 26 Alfa Electronics 86 28 All Electronics cccccccssceseees 93 137 Allison Technology 95 Allstar Electronics 000 110 AMCE Sales seserian 108 American Innovation 109 Andromeda R
177. ftware based bit syn chronization The work of determining the data rate and subsequently converting the data to a usable one bit per data bit stored format is still handled by the PC itself The advantage of this method is that since data is received by the PC serial port in the standard way the usual operating system supplied se rial port device drivers can be used to receive and initially buffer the data This buffer can be occasionally read and analyzed by an application pro gram that because of the buffering in the device driver can easily run in a multitasking environment The writing of PC software to bit sync wora sync error correct de code and display the data stream from this device would be a project of greater magnitude than the physical construction itself However a pro gram that performs these functions under either Microsoft Windows 3 1 or Microsoft Windows 95 is available at no charge via the Internet at http www cylexinc com download htm or from ftp gernsback com This pro gram decodes POCSAG at all three standard rates if you need to decode another coding format you will need to write your own software for now Note that any program accepting data from this device must be capa ble of accommodating a never end ing stream of 19200 baud data and performing a fair amount of com putation on that data at real time speeds It is necessary to use a rea sonably fast PC to run such a pro PARTS L
178. fy go to URLs 3 Tags containing A NAME are anchor tags which specify a place in a document and a name by which that place is known Anchors provide the capability of jumping to a specific point on a page via either an internal or an external jump 4 For specifics on HTML tags and standards browse through http www w3 org the official standards body for Web related activities Next time we ll provide a detailed discussion of how the page works how to customize it and how to make it the home base for all your browsing sessions See you then HAM RADIO continued from page 68 receivers use no RF amplifier ahead of the mixer at LF VLF The solution for you might be the preamplifier circuit shown in Fig 3 This preamplifier will provide around 15 to 18 dB of gain at LF VLF frequen cies It is based on the Mini Circuits MAR 6 device Ocean State Electron ics P O Box 1458 Westerly RI 02891 Tel 401 596 3080 They also stock the toroid cores Although nor mally thought of as a VHF to microwave amplifier the low noise MAR 6 actually works to near DC fre quencies with the low end being set by the value of capacitors C1 and C2 for all practical purposes The frequency response in the cir cuit in Fig 3 is limited to lower than 500 kHz by the use of a low pass filter with a 3 dB cut off at 500 kHz One purpose of the LPF is to eliminate interference from AM BCB stations that could ove
179. g crying birds gun shots tire squeals phone ringing and hoof beats There are also 18 built in electronic tunes and arcade sounds The device Offers a built in audio mixer that lets you combine sound and music from different sources such as a VCR CD player cas sette deck and microphone The includ ed speakers let you listen as you go The Home Video Producer kit has a suggested list price of 329 For more information contact Videonics 1370 Dell Avenue Campbell CA 95008 6604 Tel 408 866 8300 Fax 408 866 4859 e mail info videonics com Web http www videonics com CIRCLE 82 ON FREE INFORMATION CARD CELL PHONE WITH VIBRATION ALERT ELECTRONIC COMPON ENTS ror MOUSER Ronie Shs Call for your FREE 332 page catalog TODAY E 68 138 Products 128 Manufacturers E All Orders Ship Same Day No Minimum Order 800 992 9943 FAX 817 483 0931 http www mouser com sales mouser com 958 North Main St Mansfield TX 76063 CIRCLE 164 ON FREE INFORMATION CARD RadioShack s CT 500 is a handheld flip style cellular phone that can be set to vibrate instead of ring when a call is received It can also be placed in silent mode where a message on the LCD will signal an incoming call The compact phone measures 5 6x2 4x1 1 inches and weighs only 8 6 ounces Buy One Get One Nl Explore Yy arib on a 6 or 13 Ne sailing adventure Call your travel agent or
180. g and incoming message length Note that the values of the resistors are not critical Sohail A Bahzad Doha Qatar This is easily one of the most inter esting ideas lve seen a doorbell that takes a message This sort of thing should be available retail but haven t seen anything like it wonder if RY1 and RY2 could be wired to the memo and OGM Out Going Message switches on a regular answering machine to replace the two decks It d be neat if you could use one device to get both phone and door messages BASEMENT BELL On my street there is a retired per son who works in his basement and cannot always hear the doorbell Since the doorbell transformer is in the base ment and the rest of the wiring is upstairs built the following circuit shown in Fig 5 that senses the cur rent flow through the transformer and rings a bell in the basement The 1 ohm resistor R1 serves as a current shunt to sense the one to two amperes of current The wave shape is clamped to ground to increase its pos itive amplitude And then low pass fil tering is used so that line noise will not trigger the one shot multivibrator The Sensitivity control is part of the low pass filter increasing the resistance improves the filtering but decreases sensitivity Set the control low enough to ensure triggering The trailing edge of the multivibrator wave shape is used to start the timer That provides a delay for the basement bell thu
181. g the circuit on a PC board Some of the resistors have to be mounted vertically depending on space provided solder one leg of each LED then re heat each one individually for any necessary repositioning Finally solder the second leg of each LED and then go back and firm up the first ones after the second ones cool Check the finished board for proper solder ing and component orientation After you drill the holes in the case cover as described before drill a hole in the side of the case for the power cord from the AC to DC wall adapter Drilling the hole in the side of the case allows the finished unit to stand on end or flat depending on the setting Pull the end of the cord through the hole to the inside of the case and tie a knot in it about four inches away from the end Now solder the wires to the PC board paying careful attention to The finished PC board makes a very compact assembly the polarity indicated in Fig 4 re member that this isa DC input not AC At this point you can plug the thing in and see if it lights up at all most likely it will Check your soldering and parts placement if it doesn t because that s usually the culprit The holes you drilled in the case cover should match the positions of the LEDs and mount ing holes on the PC board With half inch spacers and appropriate screws holding the board against the case cover the LEDs should fit like a glove Close up the case and it shoul
182. gahertz When TV sign ls are tuned at the TV channel s cener frequency optimi m tuning has been achieved Other antennat can t offer center fre quency tuning like he Spectrum Antenne can They only ofe such tuning up to he edge of the center re quency As a result your TV picture re mains snowy TA ATS snowy Spectrum system Precision tuning ea MAIER Other systems Non precision tuning How does Spectrum use a home s electrical wiring as an antenna elieve it or not the Spectrum Antenna simply T ERON the giant antenna that alread exists in your home Essentially it uses all of the wiring throughout your home s walls and ceilings tc make an antenna as large as your house for unbe lievably cle ar reception of local broadcasting Acting Antena Befcre ntil recently the only convenient way to U guarantee great TV reception was to have cable installed or place an antenna on top of your TV But who wants to pay a monthly cable fee just to get clear reception or have rab bit ear antennas that just don t work on all sta tions Some people just aren t interested in subscribing to cable Or they may live in an area where they can t get cable and TV top antennas aren t powerful enough And what about those people who have cable or satellite systems but still can t get certain local stations in clearly Now thanks to fifteen years of microelectron ics research a new device has been de
183. gonally toward and past the bottom end of the 22 pin connector Flip the board back over to its origi nal position Just beyond the bottom end of the 22 pin connector there is a large square area of bare metal cen tered around a hole through which one of the case screws passes This is a ground point see Fig 6 Cut a 4 inch length of wire and strip approximately 4s inch of insulation from one end Orient the board so that the antenna connector is up and solder the wire to the upper right corner of this pad Avoid creating a mound of solder as this will prevent the case from closing properly Even up the other ends of the two wires strip a small amount of insula tion from each and solder them to the terminals of the in line 3 5 mm jack The ground wire from the SC 150 board goes to the outer or case connection on the jack The other wire connects to the tip terminal be careful not to erroneously select the middie band terminal if you are using a stereo jack Re install the circuit board back into its proper location within the SC 150 making sure to avoid trapping the sig nal wire between the pins of the 22 pin connector as it mates together Bend the two new wires over the near est edge of the front half of the plastic case avoiding the small case align ment tooth Re install the back half of the case Do not excessively tighten the screw nearest where the new wires exit as this
184. h experience needed The new Low Cost Microcontroller boards amp kits Applications commercial FCC exams have been CABLE TV Sear o Citi 206 282 6061 revised covering updated Aviation DESCR AMBLERS Marine Radar Microwave New l CONVERTERS irene VIDEO STABILIZERS 22 2ROADGAST FARTHER 222 8 I Complete Electronic Career Guide 1 Year Warranty on ll Products sects m produce ov el niit 5 1000 s of S tisfi ed customers Affordable Extended Warranty Step by step plans e ik with part sure x PLUS 2 S amp H 5 I agen l FREE CATALOG information and antenna designs ONLY 1 NO C 0 0 5 Guarantee to pass or money back WAR Sige Progressive Concepts Li l RAR AXIRA i Basca box 586 STAEAMWOOD IL 60107 5 Send for FREE DETAILS or call 630 736 9822_FAX 630 736 0353 s WPT Publications if am 4701 NE 47th Street CABLE TV CONVERTERS 2i Vancouver WA 98661 o Equipment amp Accessories s l Name l gt an Wholesalers Welcome G Electi i 3 girs api Call C amp D ELECTRONICS l city st Zip ii 1 800 379 3976 1 800 310 1153 M F 10a 6p a t a 1 E 80 0 8 0 0 j 5 g 8 J HTTP WWW ORION ELECTRONICS COM EVER NEEDA 3rd HAND WHILE TRYING TO SOLDER SOLDERING IRON ON THE TABLE AND WEIGHT ON TT NOT ONLY DOESNT TWORK 4 BUT ITS DANGEROUS TRY OUR SOLUTION 4 A WELL BUILT BASE THAT HOLDS THE IRON IN PLACE TO FREE YOUR HANDS 2 PIECES TOGETHER SO YOU LAY T FULLY ADJUSTABLE WILL FIT MOST IRONS K
185. han speed reading Speed Learning Speed Learning has replaced speed reading It s a whole new way to read and learn It s easy to learn lasts a lifetime applies to everything you read It may be the most productive course you ve ever taken Do you have too much to read and too little time to read it Do you mentally pro nounce each word as you read Do you fre quently have to go back and reread words or whole paragraphs you just finished reading Do you have trouble concentrating Do you quickly forget most of what you read If you answer Yes to any of these questions then here at last is the practical help you ve been waiting for Whether you read for business or pleasure school or col lege you will build exceptional skills from this major breakthrough in effective reading cre ated by Dr Russell Stauffer at the University of Delaware Not just speed reading but speed reading thinking understanding remembering and learning Thenew Speed Learning Program shows you step by proven step how to increase your reading skill and speed so you understand more remember more and use more of every thing you read The typical remark from over one million people taking the Speed Learning program is Why didn t someone teach me this a long time ago They were no longer held back by their lack of skills and poor read ing habits They could read almost as fast as they could thin
186. he entire circuit runs on a 9 volt battery and it automatically shuts power off after two minutes of inac tivity It makes a great learning project for kids of all ages and will provide hours of fun and entertainment i t must have been somewhat bor Circuit Description Refer to the schematic of the electronic parrot as shown in Fig 1 The circuit is based on a CMOS Large Scale Integration LSI chip from Holtek Microelecronics linc The HT8656A IC1 is a single chip voice recording playback controller that uses an Adaptive Delta Modula tion ADM algorithm to digitize sounds and store them in external DRAM The chip internally generates the refresh signals required by the DRAM and can adaress either 64K or 256K of memory The ADM algorithm works by sam pling the input signal and comparing the current audio level to the pre viously sampled level A digital 1 or 0 is generated to represent a positive or negative signal change The result is an encoded bit stream that repre sents how the audio signal is chang ing from instant to instant On the HT8656A the sampling rate is deter mined by an internal oscillator and can be set to either 16K or 32K bits per second The 32K bit rate allows 2 sec onds of good quality recording ca pacity for the 64K DRAM and 8 seconds for the 256K DRAM The 16K bit rate doubles the recording times but sound quality is sacrificed When the recorded signal is played back it is clocked ou
187. he left or right of center and up 10 or down 5 from level As we ve become accustomed to in the age of multimedia PCs there are speakers mounted to either side of the screen Those speakers however are much big ger than those that come standard with today s PCs Set into hinged doors the bass reflex speakers can be positioned anywhere within a 175 range allowing the user to pinpoint the sweet spot ac cording to the number of players and their positions relative to the TV The built in set top subwoofer enhances the bass sounds of games and music videos alike The GXTV is compatible with all vid eo game systems In fact if you have more than one system you can keep two of them hooked up at all times thanks to the two audio video inputs found on the rear When you re not playing games the GXTV won t sit around gathering dust The second A V input could also be used to connect a portable CD or cassette player to take advantage of the set s speakers or perhaps a VCR instead Of course if your game console is CD based like the Sega Saturn or Sony PlayStation you won t need a separate CD player both games machines also play audio CDs Two RF inputs allow dual connection of the TV antenna cable no separate switcher box is needed to select sources A headphone jack is found on the front panel The set s swinging door speaker design precludes front panel A V inputs the doors couldn t close wi
188. he picture and sound respectively by selecting one of the factory preset modes or your own custom settings And the SKIP TIMER button a k a Remote Surf lets you flip through other channels during a com mercial break and return to the original channel just in time to see your show re turn thanks to an on screen Countdown timer that you can set in 30 second inter vals up to 5 minutes At the end of the specified time the TV automatically re turns to the show you were watching Once you ve got your game console plugged in and the speakers and screen angle positioned properly using the GXTV is a piece of cake The GX MODE button found on both the front panel and the remote Control automatically powers up the set and switches its input to Video 1 Turn on your game and you re ready to play In game playing mode the GXTV of fers you a choice of three different video settings game custom and standard Continued on page 34 S9iU01 98 3 ueindoy 7664 yorey io March 1997 Popular Electronics N Listening to the World ICF SW1000T SHORTWAVE RECEIVER Manufactured by Sony Corporation of America One Sony Drive Park Ridge NJ 07656 Tel 800 222 SONY Web http www sony com Price 699 We doubt that anyone will ever make a perfect radio receiver We doubt in fact whether such a thing actually exists a perfect radio receiver or anything else that s truly perfect There s a reason
189. hes of S1 count 5represents 6 pushes and so on The output of IC4 will be a pulse even if S1 is stopped after the correct number of pushes because the pulse 47 T 17K IC6 a 1 4 4081 11 4 12 IC6 b 1C2 0 7 1 44081 1 6 4050 V R8 IC7 a IC6 1 4 4070 pe 1 4 4081 V 11 IC1 c IC1 d IC6 d 1 6 40106 1 6 40106 1 4 4081 15 114 IC2 f 1 6 4050 SEE TEXT from C3 a will time out resetting 104 The output of IC3 a is delayed by R4 and C3 so that IC5 a is not trig gered before IC5 b The delay is nec essary to ensure that false error pulses that accompany the accuracy pulse are blanked out by IC8 a Integrated circuit IC5 a is then triggered after a slight delay at the trailing edge of the pulse from IC3 a Integrated circuit IC5 b will always trigger a little before IC5 a which is delayed because IC5 SOIUOIOA 3 seINdoY 7664 YEW March 1997 Popular Electronics TO REST OF HOUSE R3 DOORBELL 10K CIRCUIT a R1 1K 1 b TaSi S1 a Pa DOORBELL PUSHBUTTON REPLACEMENT Pt RY2 9V D2 1N914 1 RY D OV Q3 2N2222 he Fig 4 Here s a circuit that is similar to a telephone answering machine however it takes messages from those who ring your doorbell b is triggered by the trailing edge of the IC4 output which coincides with the trailing edge of the pulse from IC3 a The pulses from C5 a and
190. his diagram illustrates the VLF LF frequency spectrum Other users of the same portion of the spectrum are European broadcast ers In Europe the 145 to 280 kHz band is the LF AM broadcasting band they also use the 540 to 1 700 kHz MW AM BCB as well Some of those stations are megawatt blowtorches such as Radio 252 from Ireland which runs megawatt level power It is interesting to see if these stations can be picked up in North America lve had some success using both loop and long wire antennas but so far it has been sketchy as to results Figure 1 shows some of the activity to expect in the LF VLF region Between about 10 and 14 kHz are the Omega navigation stations Up around 100 kHz are other navigation stations of the LORAN C category At 60 kHz you will find the National Institutes of Standards and Technology NIST time and frequency station WWVB This station is more accurate espe cially at a distance for frequency mea surements than the HF stations WWV and WWVH You can spot the WWVB signal because it uses a binary coding scheme that depends on a 10 dB amplitude shift for O and 1 binary lev els WWVB can be received all over the lower 48 states plus a consider able distance into Mexico and Canada some even tell me it s hearable in Alaska but don t know about Hawaii In the region between Omega and WWVB are a number of communica tion stations used by various nations to communicate with submarines at
191. hone jack 20 station presets about 6 by 6 by 13 tall and more Only 129 95 plus S H California residents add sales tax VISA MC accepted No COD s Order now CALL 1 800 723 4631 30 day money back guarantee Reel Talk inc 105 Rocket Avenue Suite 101 Opelika AL 36804 Phone 334 704 0751 Fax 334 704 0455 Visit our website at http www reeltalk com ga es pia KJ m DOC kd pag paa paas DEALERS WELCOME S91U01 9343 1ENdod 7661 YIIEW J CABLE DIRECT CONVERTERS DESCRAMBLERS WE HAVE IT ALL Zenith ST 1000 s 25 00 Screened amp Cleaned Surveillance Infinity Transmitters FM Wireless Transmitter Kits Vehicle Tracking Systems Bug Detectors Caller D Wired Mikes Telephone Register with Printer Long play Recorders Shotgun Mikes Telephone Recording Adapters Alcohol Testers Telephone Scramblers Hidden Video Cameras Telephone Tap Detectors Drug Testers MUCH MUCH MUCH MORE Our 27th Year Small catalog FREE Larger catalog send 5 Mail Order only Visa MasterCard and C O D accepted for equipment only Inquire for dealers prices A M C SALES INC 193 Vaquero Dr Boulder CO 80303 Mon Fri 8 a m 5 p m Mtn Time 800 926 2488 303 499 5405 Fax 303 494 4924 Internet http www siteleader com catalogdepot AMCSC home html E mail amc sales siteleader com Also SA 8580 SA 8550 SA 8590 DPBB 7 DPV 5 DPV 7 Basics Pion
192. hoose mode Program from any phone on the line using your password 35 00 RS 232 Digital I O Give your i O pins can be confi for input or output of 1921 0 points 32 00 home brewed PC Mac programs a link to the outside world 12 figured Individually um on off relays triacs etc Respond to button presses switch changes 4x4 matrix decoding a with auto debounce Stack up to 16 units on the same serial port for a total Aaa FREE W eeder ens CATALOG h K it 513 752 0279 50 MHz Frequency Counter Reads frequency from 1Hz to SOMHz and displays up to 7 digits on a 16x1 character LCD display Auto range feature provides floating decimal point and automatic placement of suffix Hz KHz or MHz Micracontroller based provides for very small parts count only 2 x 3 big 48 50 DTMF Decoder Logger Keep track of all numbers dialed or entered from any phone on your line Connects to your telephone wall jack Decodes all 16 touch tones and displays them on an LCD display Holds the last 240 digits in non volatile memory roil through and view all telephone numbers dialed credit card numbers entered etc 54 50 S91U01 98 3 JeINdOY 7661 Y2IEW March 1997 Popular Electronics N We design build repair modify c
193. ially routes power upon sensing current flow Russ Head Marshalltown IA Very interesting I ll bet know what everyone s thinking Replace R1 and R2 with a single 5 ohm resistor Right The Tank is empty for now So until next time if you ve got some cool cir cuits please send a schematic and a complete description of how it works to Think Tank Popular Electronics 500 Bi County Blvd Farmingdale NY 11735 If it appears in the column you ll receive a book from our library Send enough for a whole column and you ll also get a special chip and a kit E ALL YOU NEED to know about electronics from transistor packaging to substitution and replacement guides FACTCARDS numbers 34 through 66 are now available These beautifully printed cards measure a full three by five inches and are printed in two colors They cover a wide range of subjects from Triac cir cuit replacement guides to flip flops Schmitt triggers Thyristor circuits Opto Isolator Coupler selection and replacement All are clearly explained with typical circuit applications E WANT TO EXPAND your knowl edge of electronics Do it the easy way by studying the Electronics Fact Cards Do you travel to and from your job each day Drop a handful of cards in your pocket before you leave and the bus becomes a schoolroom At home you can build some of the proj ects and not only have fun building and using them but learn how they work at the same time E
194. icro screwdriver Hex key set Fitted vinyl e Soft zippered case e Dimensions 91 2 W X 121 4 L e 7 Assorted head amp guide aligners 3 Reverseable screwdrivers Small Flat Philips Le E _ 24 8 2 ae ORDER Ne 82 1055 Batteries not included Universal Audio video Remote e Controls basic functions of TV VCR cable box and CD or laser player Ergonomic design Main amp buttons are in line with natural thumb motion Two minute memory al lows time to replasce batteries without re programming Programming reminder sticker inside battery Compartment Sleep time for 60 30 or 15 minutes according to your TV Set key recessed to prevent accidental deprogramming Spanish instruction included Requires four AAA AC Voltage 200mV 2V 20V 200V 700V ORDER N 50 815 LOGIC Probe ORDER N2 51 1015 e Length 8 irithes 38 Range 4 5 To 15 VDC ee e Includes Test Leads e Compatible With TTL DTL RTL HTL CMOS NMOS Logic SOLDER ROLL 1 LB Spool 370 deg F melting point e Fastest solder Alloy 60 40 tin lead non corrosive flux Diam 1 2mm 3 95 ORDER N 51 1005 PS MAGNAVOX Smart Very smart 9 98 Cable 11 brands VCR 68 brands TV 77 brands Compact disc and Laser Disc 94 brands 4225 N W 72nd AVE MIAMI FLORIDA 33166 TEL 305 716 1016 FAX 305 594 6588 CIRCLE 150 ON FREE INFORMATION CAR
195. ics and in dustrial transducers The Model 876B s computer inter face can be used with an optional soft ware kit to log readings to a PC for later review In addition continuous monitor ing is possible through a Trend Graph feature that graphically represents a signals performance over time The 867B Graphical MultiMeter costs 695 For more information contact Fluke Corporation P O Box 9090 Everett WA 98206 Tel 800 44 FLUKE Fax 800 FLUKE FAX e mail fluke info tcfluke com Web http www fluke com CIRCLE 80 ON FREE INFORMATION CARD PORTABLE POWER SUPPLY Cutting Edge Enterprises Powerport 149 portable power supply provides 12 volts DC and 140 watts AC power with 9 amp hours of storage capacity The compact unit measures 44 56 inch es and weighs just nine pounds The rechargeable power supply is built around a sturdy 12 volt 9 amp hour gel cell battery A fully automatic wall charger is included The charger allows you to leave your battery plugged in year round keeping it in prime condition and ready to go ata moment s notice The Powerport 149 can also be charged in your car through the cigarette lighter plug The Powerport which is also avail able in a 50 watt model is particularly useful in the field where conventional power sources are limited or not avail able Powerport can be used to run and charge handheld radios cell phones laptop computers fax machines test equipment solder
196. ignal the cars horn and head lights began to sound and flash Once the thief has stopped the car and turned off the engine the car cannot be started again The POSSE system offers more than just theft protection If the driver locks the car with the keys inside a call to the POSSE Communications Center will remotely unlock the car provided the car is equipped with power door locks Or when you return from a long flight on a cold winter night you can call to have the engine turned on The car will be toasty warm by the time you reach it in the parking lot In the summer you can have a cool car pro vided you remembered to leave the air conditioning controls on ELECTRONIC PARROT Continued from page 47 Install a 9 volt battery and press S1 to start the Electronic Parrot The LED should come on indicating that the HT8656A is in the listening mode Now speak a short phrase into the micro phone The LED will turn off as the Par rot records your voice and LED will remain off as the circuit automatically repeats back what you just said After a brief pause LED1 will come back on showing that your Parrot is ready to perform again lf no sound is detected after 2 min utes or when the play record cycle has occurred 64 times the HT8656A automatically powers off to preserve the battery Another press of 1 restarts the circuit The microphone gain is sensitive enough to pick up voices from several feet away while still ig
197. il ament bulb to modern infrared sensors and emit ters all are easy to build Practical Electronic f i j BP363 PRACTICAL ELECTRONIC MUSIC ene The text contains a good i ly number of practical music projects most often requested by musicians All the projects are rela tively low in cost to build and all use standard readily available compo nents that you can buy The project categories are guitar general music and MIDI m i Mail to Electronic Technology Today Inc I P O Box 240 I Massapequa Park NY 11762 0240 Shipping Charges in USA amp Canada 0 01 to 5 00 2 00 30 01 to 40 00 6 00 5 01 to 10 00 3 00 40 01 to 50 00 7 00 10 01 to 20 00 4 00 50 01 and above 8 50 20 01 to 30 00 5 00 j Sorry no orders accepted outside of USA and Canada All payments must be in U S funds only __ Number of books ordered Total price Of BOOKS l Shipping see chart 0 l SUBTOtal a a Sales Tax NYS Only l Total Enclosed lt l Name Address l City State __ ZIP l Please allow 6 8 weeks for delivery Ce a lO eC eT L THEN AND NOW What happened to all those trans mitters once operated by the vast Soviet shortwave broadcasting appa ratus within the former USSR A lot of these stations under new management are still broadcasting Here are some
198. imum charge is 26 25 per ad per insertion 15 words Any words that you want set in bold are each 40 extra Indicate bold words by Seach Words normally written in all caps and accepted abbreviations are not charged anything additional State abbreviations must be post office 2 letter abbreviations A phone number is one word 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 For firms or individuals offering Commercial products or Services Minimum 15 Words 5 discount for same ad in 6 issues within one year 10 discount for same ad in 12 issues Sorry no dis counts on credit card orders Boldface not available as all caps add 40 per word additional Entire ad in boldface add 20 Tint screen behind entire ad add 25 Tint screen plus all boldface ad add 45 Expanded type ad add 2 25 per word General Information A copy of your ad must be in our hands by the 13th of the fourth month rea the date of issue i e Sept issue copy must be received by May 13th When normal closing date falls on Saturda ay sone or Holiday issue closes on preced ing work day Send for the classified brochure DEADLINES Ads not received by our closing date will run in the next issue For example ads received by November 13 will appear in the March issue that is on sale January 17 POPULAR ELECTRONICS is published monthly No cancellati
199. ing life switchable pb on mistracking and 10 1 probe with ad skipping errors 150 MHz band S The Memorex width 2 8 ns rise 4 CD Repair kit This cordless refillable butane powered soldering tool time and adjust a ed contains enough f is ideal for any on site soldering job Provides up to 35 able capacitance solution and ma watts with a temperature range up to 700 degrees F from 10 35 pF 60 teriais to clean Includes flint ignitor in plastic case safety cut off in length and repair 12 switch and C 2 chisel tip compact discs P0 390 100 PO 372 150 cccosscccccoonssercorosereescccosnoons PO 249 032 essssssensesernonoosonugosnnonnrreenee This sound to light unit features three separate outputs which can be controlled independently Each out put reacts to three different bands of the musical spectrum bass midrange and treble Has built in microphone so no connection is re quired to music source but a line in put is provided PO 320 210 cccccccereseee ET 5 heavy duty sealed back midrange with deluxe mesh grill 1 aluminum voice coil Popular midrange for auto sound installations Power handling 35 watts RMS 50 watts max Voice coll diameter 1 inch Impedance 8 ohms Frequency response 800 10 000 Hz PO 280 030 csccsrrerereesersreee Features a ferro fluid cooled Kapton voice coil and a rubber surround Very natural sounding high fre quency reproduction with
200. ing irons electric hand tools video cameras and emer gency lighting It can even be used for boosting low car batteries through the lighter plug The Powerport 149 costs 159 95 plus shipping the 50 watt Powerport 50 costs 114 95 plus shipping For fur ther information contact Cutting Edge Enterprises 1803 Mission Street Suite 546 Santa Cruz CA 95060 Tel 800 206 0115 CIRCLE 81 ON FREE INFORMATION CARD VIDEO EDITING START UP KIT The Home Video Producer from Vide onics is an easy to follow video editing start up kit for camcorder enthusiasts of all skill levels The kit provides all the basic tools needed to create exciting professional style videos at home it includes the Thumbs Up 2000 video editor the Sound Effects Mixer 2000 an instructional videotape a handbook of tips and tricks a microphone and a set of all purpose speakers S TE Sa The Thumbs Up 2000 video editor allows you to instantly cut or move scenes anywhere you want in your video production using just two main controls The large button marked with a thumbs up symbol is used to mark the scenes you want to keep the thumbs down button marks those you want to delete The video editor then assembles all the scenes you want to keep and records them on a blank continued on page 16 Rugged Reliable High performance scope But one feature really stands out Here s a hint Special Offer Only 945 Scope
201. ing team combina tions Each combatant is armed with at least five special moves plus an extra last resort move that radically alters the game odds in the last seconds of play Game play is two dimensional arcade style fighting for one or two players Parents worried about the senseless violence can try to soothe their consciences with the knowledge that their sons fighters are trying to save the world from the sinister Omega Rugal MLB Pennant Race With licenses from Major League Baseball MLB and the Major League Baseball Players Association MLBPA MLB Pennant Race features the more than 700 players that make up all 28 real life teams in both leagues Each team s home stadium is fully texture mapped in three dimensional detail The players dressed in home or away uniforms are animated using motion capture tech nology for head first slides diving jumping and spectacular catches In depth Statistics include tracking full season stats for each player and team and ranking league leaders in more than a dozen different categories You can put yourself in the game by creating a player with your personal attributes or create an all star team using the trade player feature The game offers three levels of difficulty in either simulation or arcade style and allows you to play Home Run Derby Exhibition Season Playoffs or World Series games NHL Face Off 97 NHL Face Off 97 features
202. inputs let you connect both your PC and another source As said before this is the best mul timedia speaker system I ve ever heard But what haven t mentioned is that it costs 699 to have one of your own Oh well the very best always costs a premium You can look at it as an investment in the future though While today s hot PC becomes run of the mill in a matter of months the Bose Acoustimass Multimedia Speaker System will be considered state of the art for a long long time NEW STUFF Steven Spielberg s Director s Chair from Knowledge Adventure puts you in Steven s seat and shows you how hard it can be making millions of dol lars Seriously though this unique game requires that you make the right deci sions so that you end up on Hollywood s A List Different modes take you deeper and deeper into the world of movie making You re chal lenged with creating multiple story lines coordinating stunts special effects and lots more The main goal of course is to not Take this GIANT CIRCUIT EESSIOREDIA O Volumes 1 4 LIBRARY FOR ONLY 1422 essere ce when you join the EAREN Electronics Engineers Book Club Hundreds of circuit ideas pI E i Encyclopedia o ea Circuits Kokat Peel 455 eho amp alphabetically arranged from f NG Alarm circuits to Zero crossing detector circuits tncludes schematics for the latest electronics circuits from industry leaders
203. ioned earlier or the Gernsback FIP Pre programmed chips are also available from a source mentioned in the Parts List This program is clock rate sensitive and will not work unless a 4 MHz crystal is used Construction Layout of the circuit is non critical For that reason any rea sonable breadboard assembly tech nique can be used to build the Decoder The only precautions you d have to follow are 1 Be sure that crystal XTAL1 and its shunt capacitors C1 and C2 are close to micro controller IC1 with short lead lengths and 2 Keep C8 close to IC3 and C3 close to C1 However when it comes to size building the circuit on a bread board is not desirable For the most compact assembly you might want to build the circuit in the fashion the prototype was as sembled on a double sided printed circuit board That way the entire circuit will fit inside a plastic DB 25 connector shell If you d like to etch your own double sided PC board you can use the solder and component side foil patterns shown in Figs 2 and 3 respectively Or you can order a drilled and etched board from the source mentioned in the Parts List If you build the Decoder on the cir cuit board use the parts placement diagram shown in Fig 4 as a guide Be careful about the sequence in which you install the parts Note that some of the discrete components in Fig 4 are shown made up of dashed lines Those mount on the solder side of the board
204. isteners who can use it to verify reception or to study recordings to try to pick up things they missed the first time around But it s an even better feature for any average everyday radio lover Not only does the ICF SWIOOOT let you record ra dio reception in real time but it can also time shift programs So for example if you can t stay up late enough to catch a favorite late night radio show just tell the ICF SW1000T to record it TV watchers have become accustomed to such con venience but radio listeners have had to forego it as consumer electronics man ufacturers took clocks out of receivers and timer settings out of cassette decks The ICF SW1000T has two timer set tings so that you can record two different shows The tape deck is auto reversing so you should be able to record up to 90 minutes of programming unattended As you d expect on a receiver with such wide coverage there are several ways to tune the ICF SWIOOOT One way is to en ter the desired frequency directly on the keyboard For example to tune to 9 630 kHz you could press DIRECT 9 6 3 0 EXE Alternatively you could use the tuning buttons The receiver has a diagonal row of four tuning buttons on the right side of the keyboard They work differently in each of the receiver s several operating modes In shortwave mode the outer two buttons al low the frequency to be increased or de creased in relatively coarse 5 kHz increments while the inne
205. istinguish be tween their own customized controllers We found the controller comfortable to hold and the controls to be accurate and responsive as we moved about the three dimensional worlds of Super Mario 64 and PilotWings 64 A third N64 game Mortal Kombat Trilogy went on sale as we were finishing up this article If you re concerned about the paucity of software keep in mind that more than 50 games currently are being created by Nin tendo and third party developers By the end of 1996 Nintendo itself expects to release at least a dozen 3D games includ ing WaveRace 64 futuristic boat rac ing TetrisPhear puzzle and Super Mario Kart R go cart racing E SO UOIID8 Q 4 NdOod Z664 Y2eW S gi March 1997 Popular Electronics N ei SPEED 42u kmh Flight Simulator Revisited PILOTWINGS 64 From Nintendo of America Inc 4820 150th Ave N E Red mond WA 98052 Tel 206 882 2040 Price 59 99 If flying through a three dimensional world is your idea of fun then you l have a ball with PilotWings 64 the first flight simulator for the Nintendo 64 Don t even try to compare it to those rather boring simulation games where your main wor ries revolve around the mechanical aspects of flying This flight simulator is built for fun We were at a slight disadvantage with this game our pre release copy of the game was entirely in Japanes
206. iving frequencies below 10 kHz Most cases however will permit oper ation down to about 10 kHz unless really sloppy layout and shielding prac tices are used in which case the builder will definitely get what he or she deserves The input circuit consists of a single broadband RF transformer T1 If you want to restrict operation to below 100 kHz then T1 can be an audio inter stage or output transformer The out put style works well Select a unit with 600 or 1000 ohms on one side and 4 or 8 ohms on the other Use the low impedance winding for the primary connected to the antenna and the high impedance winding to connect to the NE 602 input pins pins 1 and 2 I ve tested garden variety cheap trans formers from a number of mailorder sources as well as both types avail able from Radio Shack and found them usable to about 120 kHz though they work well up to only 100 kHz Some higher priced professional grade microphone transformers usually with 50 to 600 ohm ratios work well to around 250 kHz but cost in the 15 to 30 range as opposed to 1 98 for the cheapies The output transformer is made from a toroid core Either a T 50 2 or T 50 6 core can be used Wind 25 turns of wire for the primary winding and 3 turns for the secondary winding of the transformer SOUPING UP YOUR RECEIVER Suppose you have a LF VLF band on your station receiver but the best you can say about it would not be printable in a famil
207. ivision of The McGraw Hill Companies ELECTRONICS ENGINEERS P O Box 549 Black ick OH 43004 9918 YES Please send me The Encyclopedia of Electronic Circuits Vols 1 4 5861488 billing me just 14 95 plus shipping hand ing amp sales tax Enroll me as a member of the Electronics Engineers Boek Club according to the terms outlined in this ad If not satisfied may return the bcoks within 10 days for a full refund and have my membership cancelled Name Address Apt City State J a E Phone Valid for new members only subject to acceptance by EEBC Canada must remit in U S funds drawn on U S banks Applicants outside the U S and Canada will receive special ordering instructions A shipping handling charge amp sales tax will be added to all orders PPIF397 S91U01 93 3 UBINGOY 7661 YaueEW Lo March 1997 Popular Electronics One of the many projects in Broderbund s Kid Pix software series go over budget That can quite quickly ruin your budding career as a director in Hollywood recently received the latest golfing software from Access Software Links LS This update to the well known series of golf games and add on courses now has unlimited screen res olutions and you can run in true color if you like too There s a new terrain rendering engine and a ball flight mode as well Plus new game modes modem and network play stereo sound 54 championship holes and even a virtual tour of
208. k What makes Speed Learning so successful The new Speed Learning Program does not offer you a rehash of the usual eye exer cises timing devices and costly gadgetsyou ve probably heard about in connection with speed reading courses or even tried and found inef fective In just a few spare minutes a day of easy reading and exciting listening you discover an entirely new way to read and think aradical departure from anything you have ever seen or heard about Speed Learning is the largest selling self study reading program inthe world Successful with Fortune 500 corporations colleges government agencies and accred ited by 18 professional societies Research shows that reading is 95 thinking and only 5 eye movement Yet most of today s speed reading programs spend their time teaching you rapid eye movement 5 of the problem and ignore the most important part 95 thinking In brief Speed Learning gives you what speed reading can t Imagine the new freedom you ll have when you learn how to dash through all types of reading material at least twice as fast as you do now and with greater comprehension Think of being able to get on top of the ava lanche of newspapers magazines and corre spondence you have to read finishing a stimu lating book and retaining facts and details FOR FASTER SHIPMENT CALL 1 800 729 7323 OR FAX 1 609 273 7766 more clearly and with greater accuracy than ever before Lis
209. l catalog on the INTERNET at http www lynx bc ca virtualspy CABLE CONVERTER DIAGNOSTIC TEST CHIP we STOCK A COMPLETE LINE or CHIPS TOOLS WIRELESS QUICK INSTALL TEST BOARDS alg wht ANYONE IMPLYING ILLEGAL USE WILL BE tele SALE wE SELL PRODUCTS ONLY TO R CAE AIR FACILITIES ry IN CUSTOMER SERVICE amp TECH SUPPORT ALL ORDERS SHIP WITHIN 24HRS UPS FED X PRIORITY NEXT DAY SHIPPING AVAILABLE SALE BUY 5S TEST BOARDS AND GET I FREE MON FRI SAM 7PM SAT 10AM 2PM EST WEB PAGE HTTP WWW 800 GOCABLE COM Ses viua Mian OMMUNICATIONS FOR PORDERS j S00 CO CABLE CATALOG amp TECH SUPPORT 717 620 4363 EST 1976 1 800 USA NAVY World Wide Web http www navyjobs com RUNNING STRONGII MOST COMPLETE SELECTION OF d Syttem Upgredee d Parts amp Accessories d Tuneup Tools amp Kits d Complete Systems d Discount SKYPAC Programming Technical Suppor Hotline E Skyvision Inc www skyvision com 1848 N Freetion Dr Fergus Palis MN 56537 800 334 6455_ Int l 218 739 5231 A S SS F LightShow Draw with a laser beam Animation text lt gt music amp more Includes galvos minors servo amp demo software disk analog and digital computer interface Use an inexpen sive pen pointer or high power gas laser Fh ai Po S E st Includes 2 Stepper motors 2 DC motors computer interface traning manual amp demo soRware disk Expandable Up to 12
210. le Ready to use for many projects sa Taping stem A A m 4 4 b mts A py Ra ar battery operated F E f p i sA Ji 250KV Tesla Coil 10 14 of Explosive 7 Bolts of Lightning e Transmit Wireless Energy e lon Motors A e Anti Gravity Visible Beam Gas Lasers Millions degree teal ms illuminates low meeer level clouds f Light Shows e Window Listener Hoe Optical Projects e 12 115V Science Project 69 50 pear asd hess monstra as from hoverboards to pyrotechnics Cybernetic Ear Enhances normal t jLine ione 1 infinity Transmi fits easily into either ear Many many uses to Usel eady to CYBEREAR 19 95 Tapes Phone Conversation e Extends Excellent Signal Beacon LHODIK KitPlans A Great science fair project TELCON3K Plans Kit TELCONSO Read to Use Ae e Strange and bizarre pyrotechnical effects gt Many other experiments shown i in detai Award winning science seed BTC3 Plans ae BTC3K Kit Plans with coil i Levitate an object GRAT Plans 15 00 sn Fecawbeatoa I GRAIK Power Supply KivPlans 99 50 FT GRA10 Assbld Kit Pians Includes text book on Anti Gravity theory Spectacular color Pulsates to mic sounds 8 9 with intensity and sodnd Use tone phone anywhere in the world to e Monitor your premises avoid break ins Access ongoing c
211. lectronics gt fey C12 M Mla on i lo h peN gt R2 1002 ah Q Q Ke Nh aa ah Nh gt to on Q i ad N pare C1 470pF R12 150K ki R3 C3 _ l 1009 1 B1 i 9V i E I 16 Hi D2 28 5 6V e H2 27 p D1 3 6V 17 C8 R9 1 C15 24 12K T 18 2 IC3 20 A LM386N SPKR1 8Q Ciais 100 c9 2N4401 Fig 1 Here s the schematic for the Electronic Parrot The circuit is based around the HT8656A IC1 which is a single chip voice recording playback controller for the electret microphone MIC1 The microphone output signal is DC coupled to the preamplifier input by C8 and resistors R7 and R8 set the preamp gain at 5 Resistor R8 sets the internal oscillator frequency of IC1 to 450 kHz and header H2 selects the sampling frequency as either 16KB sec or 32KB sec Chip IC2 is either a 64K x 1 bit or 256K x 41 bit dynamic RAM chip The appropriate address refresh and read write signals for the DRAM are provided by IC1 Header H1 selects either the 64K or 256K memory size When IC1 is in playback mode the audio signal appears at the Vou PIN 24 and is DC coupled by C5 and fitered by R4 and C7 The audio is amplified by IC3 an LM386 amplifier which then drives the 8 ohm speaker SPKR1 Since IC3 is connected directly to the B1 IC1 shuts IC3 off via R10 and down mode
212. lengths with the open end conve niently stripped and tinned 5mm RATING CAT NO SIZE TYPE 125V A LENGTH ff COLOR TEMP SPT IBLACK 18 2 SPT 10 6 Biack 60 SPT IGRAY 18 2 SPT 1 10 6 Gray 60 SPT 2BLACK 18 3 SPT 2 10 6 Black 60 SPT 1 PRICEEACH ea CATNO 1 10 100 500 SPT I1BLACK 88 57 51 46 m SPT IGRAY 92 6 55 AD a a SPT 2BLACK 1 97 1 21 107 97 WWW CiI com Digital Panel Meters LCD amp LED Don t let the prices fool you These digital panel meters are not surplus so even if you 3 1 2 Digit LCD 3 1 2 Digit LED 4 1 2 Digit LCD PM 328 4 1 2D LCD Digital Panel Meter Features 200 00mvV Full Scale pet Sensitivity 3 5 d led digital panel meter design them into an ongoing manufactured e Single 9V DC Operation product you can be assured of continued e Decimal Point Selectable availability These high quality digital panel a AA N o meters are decimal point selectable with e Low Battery Detection and Indication guaranteed zeroreading at zero volts input High input impedance gt 100 Mohm Applications include Specifications PM 128 PM 129 199 9mV DC Specifications PM 328 199 99mV DC e Voltmete e Capacitanc Maximum Input Maximum Input A ae a er M ae Maximum Display 1999 counts 3 1 2 Digits Maximum Display 19999 counts 4 1 2 Digits w Automatic Polarity Indication w Automatic Polarity e pH Meter e LUX Meter indication Method PM 128 LCD Display
213. lsom s sssssssersereeees Hi Mental Automation 4 96 157 MicroCode Engineering CV3 171 MicroCode Engineering 3 Millennium Enterprises 111 Modern Electronics 108 164 Mouser Electronics clo National Control Devices 94 NRI School c0sssessesones ol Ohio Automation 0 107 Oldaker Mfg Corp 00 109 43 Optoelectronics cecee CV4 OTOR cea ett 108 MY a E E 110 146 Parts Express sssr 93 47 Prairie Digital Inc 0500 95 46 Prini o e a a 95 E c o o E oes nees 106 Silicon Valley Surplus 10 Smithy Company 0000008 101 Solutions Cubed sssssee0 109 Tab Books 3 cccescccdanns 13 55 TU Tronis 106 The Tech Shack 109 H3 TelWIOK soe eres 96 136 UCANDO Videos 0008 106 US C yberlab oona 8 Visual Communications 101 Weeder Technologies 8 Weka Publishing 06 102 172 Windjammer Barefoot Cruises 16 WPT Publications 108 134 Xandi Electronics daa E T 85 ADVERTISING SALES OFFICES Gernsback Publications Inc 500 Bi County Bivd Farmingdale NY 11735 3931 1 516 293 3000 Fax 1 516 293 3115 Larry Steckler EHF
214. ltage changes in the AC line cause smaller but propor tional changes to the DC output of the transformer the Monitor can de tect these smaller changes Circuit Description Figure 1 shows the schematic of the AC Line Voltage Monitor circuit As mentioned before the Circuit receives 12 volf DC power from a wall transformer The circuit is centered around two quad LM324 op amp ICs IC1 and IC2 that receive reguiated operating power from a clamped portion of the DC supply pro vided by a 5 1 volt Zener diode D3 The op amps drive an LED bargraph con sisting of LED1 through LED7 The op amps receive an adjustable reference voltage from the center contact of potentiometer R16 and an input voltage from the voltage divider consisting of resistors R4 R2 R4 R6 R8 R10 R12 and R18 Those resistor values were chosen so that the op amp out puts sequentially turn on and light the LEDs as the AC line voltage or one tenth of it varies from 100 to 132 volts Potentiometer R16 sets the midpoint of the LED bargraph usually 118 volts which can be shifted if you like emory Systems 0487375 24 95 he TAR Elocrar acs Gude Understanding Electricity and Electronics ff f P G Ranty Sane 0582157 26 95 USING THE f OSCILLOSCOPE 5 BOOKS WHEN YOU JOIN THE 0112738 XX 45 00 Hardcover Counts as 2 TY REPAIR BEGINNERS DE 073092x 19 95 a COMPUTER ECHNICIAN S HANDBOOK 3rd Edi
215. ly that one of those people is you A signal intended for a digital pag er consists among other things of an individual pager address followed by the message to be displayed on the pager Note that the word digital here refers to any pager that receives binary data including both numeric digits only and alphanumeric full text pagers The majority of messages in a broadcast will be simple tele phone numbers or digit codes but people with alphanumeric pagers are increasingly making use of de tailed text messages often of consid erable length But how do you know if the mes sages being transmitted are being re ceived correctly There s no backup message generated by paging ser vices and you therefore have no way of determining if you re getting the whole message Whats needed is a way of getting a second look at a message The Alphanumeric Pager Decoder Catch beeper messages from the described in this article together witn a scanner radio and a PC will permit you to decode the messages that are transmitted to about 80 or 90 percent of beepers that are commercially available and view them on your computer screen You could for ex ample keep a log on disk of all mes sages transmitted to your own pager and verify that all were received by the beeper Also corporations could keep time stamped logs of all mes sages sent to their in house pagers Units like the Decoder are quite effective and for this
216. m It is worth pausing here for a mo ment fo emphasize the importance of clean reception on the scanner Move or re orientthe antenna as nec essary The sound you hear should be as free as possible from hiss or crack ling noises The sensitivity and selec tivity of a wideband receiver is often not as good as that of a single fre quency pager receiver and getting good reception is subsequently more difficult Watch the Signal indicators near the top of the AccuPage Radio Monitor screen The green fo red ratio corresponds to the correct to errors ratio The left indicator is the one to watch initially the right indicator al ways starts at 400 bad and repre sents a cumulative weighted average over the last several seconds of valid data We are looking for the left in dicator to show mostly green White indicates no valid data at all If the indicator remains white and the LED glows as described try toggling the Inverted Data checkbox Every scanner is different and the output polarity of yours may be backwards from the programs convention If you just cant seem to get any indication on the signal indicator try increasing the volume setting by tiny 9ju01 98 4 JeINdOY 7661 Yyaey Ta Qa March 1997 Popular Electronics incremental amounts being sure to try both settings of Inverted Data at each position Once the indicator shows some green then keep adjust Ing the volume for best r
217. mentala com woman TALL Toe JALA e TONLIIUIN JUONEN Woo xma mmm dnq THZO 8E6 SI XUA JUSTIN PAD JOMOd CrOrG BD MOLA UWMIMOWN S ALLEM PISHSIPPNA PIO SSHZ QIJOSQO BUIOIE q IIA TL NOL DS MOA yew amstu ued noA Arow ysej 0 ee SUOHOUNY JUSUIN SU MIU pEOTUMOP wed NOA osnesaq PUY JWouloINsvayy Ad JOMOY PUL TOMMA ani enie TOD ALLA S Gons somos euis IMO Aue uo pelsjjo jou snf ore yey suonounyg stsA eue ugis 303 esti osje nog geulis pordde Apena Jo papina Apewa ue Zuisn pourojiod oq ued yg Jo jz WON X9 N 9 A Soyes Tere OvZ0 8 6 STP O d JosnoyIoMod eo e OF Yous Zuu Bu MOA umy 0 Apra st pue MON 2QBITEAE ST OOL OS L nn a aar a an a a RAN SuOTOUNY VONeNpout Jo PSIJAIP pPI amp pue norstoaId pozisomuAs ZH NOA SOAIZ OOL DNS L iS6L ATINO YOU GONVAUOMad CAZISAH LNAS ZHW 07 90 CIRCLE 143 ON FREE INFORMATION CARD Prices are subject to change w any prior notice FLYBACK gt CALL TOLL FREE 1 800 325 2264 GOLDSTAR 154 074R 20 MINIMUM ORDER ORDER N 63 0189 CALL NOW FOR YOUR 232 PAGE FREE CATALOG 1 800 325 2264 HOT PRICES ON POPULAR SEMIS TUN O WASH ORDER N2 30 0100 z5 1 ai lt 7 50 PENN Fast drying electronics CODE PE96 PLEASE MENTION WHEN ORDERING items are subject to avallabiiity TRANSFORMERS gt 50 gt Replaces 31 2 CFC Free e s a s ie UNIQUE REALTIME Manu
218. mmer if you dont want to ruin your maga potentiometer zine and don t have a photocopy R17 4300 ohm i machine then you should do the fol ADDITIONAL PARTS AND lowing MATERIALS First place the PC board copper side down on a piece of thin card board used the blank side of a business card Align the LED side of the PC board and one end of it to edges of the business card to make position ing easier later on Transfer the cath ode mounting holes of the LEDs on the PC board onto the cardboard with a pin or awl There are four mounting holes for screws on the PC board in cluded with the kit We ll use only the two holes that are farthest from the 1 1 4 INCHES Fig 2 This full size foil pattern can be used to make your own PC board Ponted circuit materials enclosure 120 volt AC to 12 yolt DC plug in voltage adapter half inch spacers 2 wine solder mounting hardware see text ete Note The following is available from Marlin F Jones amp Associates Inc P O Box 12685 Lake Park FL 33403 0655 Tel 800 652 6733 AC Line Voltage Monitor Kit 6797 RB including everything except a case 10 95 plus 4 50 shipping and handling MOUNTING HOLES e 132 e128 123 LEDs lt e118 e 111 e105 100 Fig 3 This drill guide matches the positions of the LEDs and the hardware mounting holes on the PC board Preparing the cover for the Monitor s enclosure should now be si
219. motors up to 3 amps per phase Now with 4 Axis Linear Interpolation A Add 4 for shipping Computer with paralic printer por amp cable assembly power supply amp laser ar required FREE FLYER Vaa 510 582 6602 ra 510 582 6603 S VS 1273 Industrial Pky West Bidg 460 PO Box 55125 Hayward CA 94545 0128 Computerized Motors 39 OWN A MACHINE SHOP The Smithy 3 in 1 machine tools in one easy to use benchtop machine Save time amp money For home or business Call for your FREE Info Pak amp instructional video 1 800 345 6342 Ask for 3 FREE Operator PE3 s Machining Basics video i Dept PE3 PO Box 1517 Smithy or write Ann Arbor MI 48106 1517 BUY WHERE THE DEALERS Descrambiers 154 verterters an ests Box aay sath Every Da 2 Year Warranty P CALL NOW ember Better Business Buresu e Convertors amp Descramblers e 30 Day Money Back Guarentee e Visa MC C O D Welcome Info 630 889 0281 nae 630 889 atid ig Sottware S AAA wae MARA Cincinnati Ohio 45244 1888 561 2060 ote ae A A Hill RR e All Equipment New e 6 Month Warranty P O Box 1494 Addison IL 60101 HRS Mon Fri 9 6 CST Sat 9 3 CST The Latest High Tech ag sotessional Electronic Devices Our latest catalog offers a HUGE selection of surveillance counter surveillance privacy devic
220. mple bling the PC board Figure 4 is a parts placement di agram for the circuit Some of the re sistors have to be mounted vertically depending on space provided Mount the parts basically in size order starting with the resistors Don t forget to install a jumper in the location marked J The kit includes IC sockets which are always a good idea to use but aren t necessary if you don t have them The kit includes two red LEDs two orange and three green The red LEDs are intended for the high and low ends the green for the three mid range and the orange for in between each You can of course use any color scheme you like The LEDs have to be mounted evenly and at a certain height off the board depending on the length of the spacers you use to mount the board to the case cover later on With half inch spacers the base of the LEDs has to be about inch above the board used a inch wide strip of cardboard folded over and taped to the board to maintain the height of the LEDs Alternatively you can cut inch spacers for the LEDs from plastic tubing coffee stirrers or whatever It s a good idea to lightly a ee KEN T Hs SEE TEXT a il al 4 i a d T PE pi T E Le n JEN ie n E aat e mer ee i ek oe j am a a a a E PLS E i s b J n a iE i i 5 bh i J B T E TO 12VDC WALL TRANSFORMER Fig 4 Use this parts placement diagram when assemblin
221. n 5 pa ete desktp production direan x Lisa Boynon desktop roduc Kathy Campbell ecient assistant CART DEPAR TMENT Andre Durant ortdirector Russell E Truslson illustrator CIRCULATION DEPARTMENT Jacqueline P Cheesebers VCircimakion Girectar o s Theresa Lombards ze circulation assistant archer Michele Torrile POPULAR RECTRONICS bookilors BUSINESS AND EDITORIAL OFFICE Gemsback Pubhcotions i PEPEE 516 293 m5 W EW sback com President art rh Steckler 1 600 827 D383 TADAM SSO PM EST Advertioing Sales Offices listed on page Compostion by Maes rope Cover illustration by Mihom Sales ABC 2 AUDITED Since some of the equipment aa cieni ry described in POPULAR RECTRONICS may roicte to or be covered by US patents POPULAR ELECTRONICS dis cloims any liability for the infringement 5 by of such the making ting r selling af pe equipment or circuitry ond sta that anyone interested in such projects consuli a potent attorney A Virtual Er vironment For Growing Printed Circuit Boards Finally a low cost easy to use professional quality PCB design tool TraxMaker is a Printed Circuit Board PCB layout program that supports multiple layers along with full auto placement of components and autorouting of tracks TraxMaker makes good design practice easy according to user definable Design Rules It has a familiar easy to learn Windows interface Trax
222. nada the system is monitored by Chubb Security Systems the coun trys largest network of Central Station alarm monitoring centers Combining the capabilities of Chubb Security Sys tems S2RK s Base Station and proprie tary software and the MAPINFO database the system provides a graphical display of all Canadian and major U S cities down fo street level detail Vehicles are tracked on digitized street maps that are auto matically selected while simulta neously tracking multiple vehicles across diverse geographic regions S2RK is Currently negotiating with Tommy Lasorda s MetroCell Security to offer a similar capability in the US Besides recovering stolen vehicles S2RK is also offering SatSting for securi ty for truck fleets especially those car rying very valuable or hazardous materials heavy equipment rental fleets taxi companies military arms shipments and so forth Audiovox POSSE The Audiovox Corporation s POSSE is another ap proach to keep stolen cars from be coming victims of chop shops or just joy riders For example in a car jack ing situation the driver simply leaves the POSSE equipped car without any resistance Using the nearest touch tone phone including coin operated and cellular ones the motorist places a toll free 800 call to the POSSE Com munications Center to report the theft In seconds the Communica tions Center sends out a signal to acti vate the POSSE Once POSSE receives the s
223. nd an identical OPEN button to its right Just be hind the POWER is found the RESET button On the front of the unit are two ports for plugging in the game controller that comes with the game and an additional one you can buy for about 30 The controller offers two separate sets of buttons On the right side are four indi vidual buttons marked with an X a circle a triangle and a square Each is used for specific moves in various games On the left side of the controller is a set of four directional buttons that allow you to move on screen characters up down right left and diagonally Between the two groupings are the SELECT and START buttons At the back of the controller are four action buttons arranged two be hind each grip for easy access by the index finger of each hand Just above each of the controller plug in ports is a slot fora memory card Available optionally the memory cards let a player save his or her place in a game store a high score Or save character or team attributes You can bring your memory card to a friend s house plug it into his or her Play Station and prove that you weren t exag gerating your scores The PlayStation doubles as a CD player which ts especially nice if you have it con nected to a home theater setup with a good audio system or the GXTV described later in this issue CD operations are con trolled on screen using the game control ler to select specific t
224. nd for used kits Prices subject to change without nolice Returns are subject to a restocking fee Shipping and Handiing is non refundable 1997 IEC CLASSIFIED MISCELLANEOUS ELECTRONICS FOR SALE THE Case Against Patents Thoroughly tested and proven alternatives that work in the real world 28 50 SYNERGETICS PRESS Box 8 9 C Thatcher AZ 85552 520 428 4073 Visa MC POOR reception on your A M radio Our signal booster will help Guaranteed Send 2 00 for de tails eee with order FALA ELEC Ui CS PO Box 1376 Dept 4 Milwaukee WI 1 FM Micro Broadcasting 88 108MHz As sembied PLL transmitters and rf amps mono ster eo 1 2 100 watts Photo catalog info call 250 642 2859 R SCOTT COMMUNICATIONS LTD We ship world wide from Canada PLANS KITS SCHEMATICS TRANSISTOR Data Tables Given are the basic electronic parameters for the worlds popula tran sistors in one volume A must for servicemen hobbyists and engineers Order Transistor Data Tables BP401 for only 9 95 price includes shipping from ELECTRONIC TECHNOLOGY TODAY INC PO Box 240 Massapequa Park NY 11762 0240 USA and Canda only US funcs CRYSTAL Set Handbook Visit antiquity by ungane radios your grandfather built Assem bie a Quaker Oats rig wind coils that wosk and make it look like the 1920 s Sel pg lus 4 00 for ahipeng and handing CLAGGK INC PO Box 4099 Farmingdale NY 11735 US funds only USA and
225. ndling to Canada 10 U S Currency Overseas 15 foreign orders must be prepaid CT residents add 6 sales tax Supplements will be sent 4 5 times a year on a fuily guaranteed 30 day trial basis They may be cancelled at any time MAIL TO WEKA Publishing Inc 1077 Bridgeport Avenue PO Box 886 Shelton CT 06484 Call 1 800 222 WEFA or fax to 1 800 256 5975 for fast service S91U01499 3 JeiNdog 7661 YEW 2 ee Use POPULAR ELECTRONICS READ BY BUYERS OF ELECTRONIC EQUIPMENT ACCESSORIES AND PARTS INSTRUCTIONS FOR PLACING YOUR AD HOW TO WRITE YOUR AD TYPE or PRINT your classified ad copy CLEARLY not in all capitals using the form below If you A to place more than one ad use a separate sheet for each additional one a photo copy of this form will work as well Place a category number in the space at the top of the order form special categories are available If jau do not specify a category we will place your ad under miscel aneous or whatever section we deem most appropriate We cannot bill for classified ads PAYMENT IN FULL MUST ACCOMPANY YOUR ORDER We do permit repeat ads or multiple ads in the same issue but in all cases full payment must accompany your order WHAT WE DO The first word and company name of each ad are set in bold caps at no extra charge No special positioning centering dots extra space etc can be accommodated RATES Our classified ad rate is 1 75 per word Min
226. ne additional numbers to punch in PINs to remember and best of all no waiting PhonePrint was put into operation with AirTouch Communications Inc for their huge cellular market in Los An geles in early 1995 and is now being field tested by NYNEX Mobile Commu nications and AT amp T in New York City These two cities are considered by the industry to have the most pervasive cel lular fraud problem So far 15 million il legal cellular calls were termininated in the Los Angeles area alone PhonePrint can save the cellular phone industry millions annually by re ducing the labor intensive task of inves tigating fraud and reconciling custom er s bills Customers will be happier because they won t be billed for fraudient calls and don t have to go through the often frustrating hassle of getting them resolved By eliminating illegal calls cellular phone Companies will gain more Capacity for legitimate traffic Finally PhonePrint will make it more difficult for criminals to conduct a variety of businesses using cloned cellular phones including credit card fraud stolen or counterfeit money or ders and airline tickets and drug and weapons trafficking a GOETEC FINGERPRINT COMPARE CECIDE i LEGITIMATE CUSTOMER KaRa fna E ih Prom ea ie CLONE j 4 Pe A w A A A p fe ics fl a pete j g kee i j PhonePrint compares the radio frequency signal of each cellular call to discriminate between legitimate ph
227. ng controls will function better giving the Spectrum Antenna a stronger signal to fine tune It also works in con junction with your outdoor antenna Risk free offer The Spectrum Universal Antenna Tuner comes with our exclusive 90 day risk free home trial and a 90 day manufacturer s warranty Try it and if you re not satisfied return it for a full No Questions Asked refund We realize that most people have more than one TV in their home We are offering a special discount on addi tional Spectrum Antennas so you can get great reception on all your TVs Spectrum Antenna 39 4 S amp H Additional antennas just 34 S amp H free Gain Booster 19 2 S amp H Please mention promotional code 1495 PL 10173 For fastest service call toll free 24 hours day 800 230 5023 To order by mail send check or money order for the total amount including S amp H To charge it enclose your account number and expiration date Virginia residents only please add 4 5 sales tax a comtrad 2920 Waterford Lake Dr Suite 102 Midiothian Virginia 23113 March 1997 Popular Electronics k o NEW PRODUCTS continued from page 8 tape It can remember the location of more than 200 scenes and can fade to black between scenes The Sound Effects Mixer 2000 is a push button device that offers a collec tion of 59 sampled audio effects includ ing footsteps door slams rim shots laughin
228. ng frequency Use an appropri ate cable to connect the output of the scanner to J1 If you are using the speaker earphone output of the scanner install a connecting pin to header H1 remove it if you are using a discriminator output more on that later Leave the pin on header H2 off it is needed only in a small percent age of cases with discriminator out puts and almost never with speaker outputs If you are using a discrimi nator output then the following para graph referencing volume control settings does not apply you should be able to just plug and go If the LED does not come on during transmis sions then install the pin on H2 Set the volume control to its mini mum position Connect a small speaker or earphone to J2 Be sure that the COM port is set correctly and that you check the Enable check box near the top of the AccuPage Ra dio Monitor screen Gradually in crease the volume setting until the LED begins to glow continuously dur ing transmissions stop at this point Do not change the volume between transmissions you will just be turning the control with no reference During a paging transmission the apparent intensity of the LED should appear to waver in sync with the sound you hear but if should not go out except be tween transmissions If you have an oscilloscope connect one channel to pin 1 of IC2 and the other to pin 9 of IC1 to see how the circuit is interpret ing the analog wavefor
229. ng the original data waveform from the high ly distorted waveform available at the audio output of a typical scanner Ex amination of the outputs of several popular scanners reveals certain common characteristics One of these is that all DC information is lost if along string of 1 s or 0 s is encountered no bit transitions the output quickly settles to a center zero point re gardless of the polarity of the binary data Another is that any bit transition causes an initial spike of the proper polarity followed by a moderate to severe overshoot of the opposite po larity The second overshoot back in the original direction is usually well damped and of much lower ampli tude To make matters worse the ringing frequency is often roughly equal to half the bit rate of a 1200 bps data stream causing transition in duced spikes to sometimes super pose themselves on the first overshoot from a previous transition The Decoder attempts to recon struct the Original data by the use of a schmitt trigger There are two oppor tunities for trigger points on the audio waveform the initial spike and the first overshoot Which one is best depends on whether or not the amplitude of the initial spike is significantly higher than the first overshoot The general lack of a major second overshoot is the detail that allows us to get away with using the first overshoot instead of the spike For any particular scanner direct exp
230. ngeles County a vehicle is stolen every 3 8 minutes When a LoJack equipped car is PHONEPRINT THWARTING CELLULAR PHONE FRAUD The widespread use of cellular phones has resulted in a new crime wave cellular phone fraud According to the Cellular Telecommunications In dustry Association CTIA well over a thousand illegal cellular phone num bers are activated daily One of the most prevalent forms of cellular phone fraud involves cloning Here the thief illegally duplicates tne Electronic Serial Number ESN and Mobile Identification Number MIN be longing to a legitimate owner and uses it on one or more other phones which are often also stolen At the end of the bill ing period the legitimate owner gets the bill usually a huge one Cellular phones have a subtle but unique radio frequency signature or fingerprint that can be used to dis criminate between legitimate and il legal phones PhonePrint now being marketed by Corsair Communications measures the unique physical charac teristics of each phone s radio signal as it enters the cellular system Each call is compared against the RF signature of the legitimate user s phone stored in the system s data library Fraudulent cel lular calls are detected instanteously and immediately terminated This nor maily all happens in the time it takes to process the call setup The check is completely transparent to the cellular phone user no modifications to the pho
231. nk Temperature for Guaranteed Accuracy 23 C 5 C RH lt 75 Temperature Ranges Operating 0 C to 40 C 32 F to 104 F Storage 10 C to 50 C 14 F to 122 F Power 9V Alkaline of Carbon Zinc Battery NEDA180 Low Battery Indication BAT on Left of LCD Display Dimensions 188mm long x 87mm wide x 33mm thick Net Weight 400g R 1 999 any qty DC Voltage DCV Range Resolution Accuracy 200mV 100V 2000mV ImY 20V 1OmvV ecladsecocis Resistance Q 200V 1OOmV Range Resolution Accuracy 1000V IV 2002 100ma2 Maximum Allowabie input 1O0OOV DC 20000 12 or Peak AC 20K22 10Q 1 2 1dg 2dgts DC Current DCA 200K2 10002 Range Resolution Accuracy 2000K2 1KQ 200UA 100nA 20M2 s 10KQ2 2 1dg lOdgts 2000UA ILA Maximum Open Circuit Voltage 2 8V 20mA 10pA 2 2erdg 2dgts 200mMA 100A Diode Test 10A 10mA 1 2 1dg 2dgts Measures forward voltage drop of a Overload Protection mA Input 2A 250V fuse AC Voltage ACV Range Resolution Accuracy 200V 100m V Derdg lOdgts 750V 1V Frequency Range 45Hz 450Hz Maximum Allowable input 750V fms semiconductor junction In mY test cur rent of 1 5mA Max ohFE Test Measures transistor hFE Response Average Responding Call brated in rms of a Sine Wave CAT NO DESCRIPTION PRICE 9300G weed High Quality DMM with Rubber Boot 19 00 Switchable Scope Probe Sets Selectable X1 Ref X10 These high A quality scope probe sets are for oscillo scope
232. no ring most background noises Experi ment with the best location for your new electronic pet Your friends will probably be amazed and delighted by your Parrot But the best part is that you won t have to feed it or clean out the cage Ml 91U01499 3 IeINdOY Z661 YEW a March 1997 Popular Electronics on RO ine voltage is serious business E it should always be han died with respect There s enor mous potential energy lurking at each and every AC outlet in your home ready to power an appliance or possibly cause a lethal shock But lifeforms are not alone when it comes to possible AC dangers If the voltage coming out of an outlet is not of the proper level possible hazards exist to equipment At the very least im proper AC line voltages can damage one of your precious appliances Because the AC voltage level in your home is so important it s good to know what that level is Especially if you have computer equipment plugged in or have been encounter ing strange problems with certain ap pliances And because leaving a voltmeter plugged into an outlet is hazardous wastes batteries and ties up your voltmeter its good to have some kind of inexpensive line powered device dedicated to monitoring line voltage In about an hour or so you can build the AC Line Voltage Monitor de scribed in this article Best of all the low time investment involved in the project Is matched by an equally low economic in
233. nore power commu cate operating Con ditions and perarr automates az tivities conticuing the microworid revolution thas has Deen callec the greatest scien ific frontier of this cen tury Using methids similar to those of the integrated circuit fabrication in dustry researcher at Sandia Natoral Laboratory Iz Albuquerque New Mexico have suzceeded In mass producing micronachines that can perform work and think abou what they re doing al on one chip BY DOUGLAS PAGE The Micro Motors What kind of machines cre w2 ciscussing here They we microscopic motors fab ricated by beira sunk in etched tenches c corig with integrated Circuit erains on individual silicor chips more on how they e made later The machines tum wo similarly sized gecrs each one nundredth the weight of a dust mite at the rate of 200 099 evolutions per minute Each geo s appraximoatsty one hur dredth the hickness of the paper this page is pritted on mtucn thinner than a humar hcir Ths is devinitely a substantial ad vance theyre cone up with said Roger Howe cirector of the University of Calfornisc Berkeley s Sensor and Acuatcr Center A lot af people are champnyg at the bit ta access this tecnarogy Applications The techncicgy was first developed to enhance the safety and security of nuclear weapons by making heir locking mechanisms smarter cnd more reliable Now if has possible applicctions In several indus
234. ns to flow from the electron poor P region into the electron rich N region while pulling holes from the electron rich N region into the hole glutted P region In simpler terms Conventional cur rent will not flow from the N to the P region and electron current will not flow from the P to the N region So the diode only allows current flow of either type in one direction The action of applying voltage in the correct direc tion is called forward biasing while applying voltage in the other direction is called reverse biasing Now we know enough about diodes to mention a little more nomenclature The P region and its wire form the anode of the diode The N region and wire are the cathode The barrier potential mentioned last month produces a voltage drop across any diode even when its forward biased That is called the forward volt age drop and it depends on the sub Strate the diode s made from The two most common materials are silicon and germanium with forward drops of around 0 7 and 0 3 volts respectively The forward current a diode can han dle is not limitless The actual amount for a given unit depends on the area of its junction the heat dissipation of its case etc This characteristic is called the maximum forward current When there is a gentle reverse bias a tiny amount of current does actually flow through an electron It s called the leakage current You
235. nster CA 92683 Marvac Dow Electronics 980 S A Street Oxnard CA 93030 Kandarian Electronics 1101 19th Street Bakersfield CA 93301 Whitcomm Electronics 105 W Dakota 106 Clovia CA 93612 Marvac Dow Electronics 265 B Reservation Road Marina CA 93933 Minuteman Electronics 37111 Post St Suite l Fremont CA 94536 HCS Electronics 6819 S Redwood Drive Cotati CA 94931 Halted Specialties Co 3500 Ryder Street Santa Clara CA 95051 Metro Electronics 1831 J Street Sacramento CA 95814 The Radio Place Inc 5675 A Power Inn Road Sacramento CA 95824 HSC Electronics 4837 Amber Lane Sacramento CA 95841 Colorado Gateway Electronics of CO 2525 Federal Blvd Denver CO 80211 Connecticut Signal Electronics Supply 589 New Park Avenue W Hartford CT 06110 Cables amp Connectors 2198 Berlin Turnpike Newington CT 06111 Electronic Service Prod 437 Washington Avenue North Haven CT 06473 Georgia Norman s Electronics Inc 3653 Clairmont Road Chamblee GA 30341 Illinois Tri State Elex 200 W Northwest Hwy Mt Prospect IL 60056 Maryland Mark Elec Supply Inc 5015 Herzel Place Beltsville MD 20705 Amateur Radio Center 1117 West 36th Street Baltimore MD 21211 Massachusetts U Do It Electronics 40 Franklin Street Needham MA 02194 Michigan Purchase Radio Supply 327 East Hoover Avenue Ann Arbor MI 48104 The Elec Connection 37387 Ford Road Westland M1 48185
236. ntaining exciting offers on the latest books in the field at savings of up to 50 off the regular publishers prices If you want the Main selection do nothing and it will be shipped automatically If you want another book or no books at all simply return the reply form to us by the date specified You l have at least 10 days to decide If you ever receive a book you don t want due to late delivery of the bulletin you can return it at our expense Your only obligation is to purchase 3 more books during the next 12 months after which you may cancel your membership at any time And you ll be eligible for FREE BOOKS through our Bonus Book Program A shipping handling charge and sales tax will be added to all orders All books are softcover unless otherwise noted Publishers Prices Shown PE397 If coupon is missing write to Electronics Book Club A Division of The McGraw Hill Companies P O Box 549 Blacklick OH 43004 9918 s31U04 98 3 seiNdoY Z664 Yep wn wn 5 pm l 4 LM324 i 7 IC2 a 1 4 LM324 1K D2 D1 1N4148 1N4148 March 1997 Popular Electronics On e2 TO 12VDC WALL TRANSFORMER Fig 1 Here is the schematic for the AC Line Voltage Monitor circuit A wall transformer steps down the line voltage and converts it to 12 volts DC to supply the circuit with both power and a small scale indicator of how the voltage fluctuates PARTS LIST FOR THE Construction The circuit is very sim row of
237. ntendo 64 and Sony PlayStation videogame systems Samsung GXTV Model GXE1395 videogame TV Sony ICF SW1000T Shortwave Receiver Royal FL95 PC Organizer and much more COLUMNS DEPA 12 Multimedia Watch The Best PC Speakers in the World Marc Spiwak 20 Net Watch Extra Extral Dan Karagiannis 63 Scanner Scene Entering the Information Age Marc Saxon 64 Antique Radio Back to the Star Roamer Marc Ellis 67 Ham Radio Bands You ve Never Used Joseph J Carr 69 Computer Bits Your Own Greatest Hits Web Style Jeff Holtzman 71 DX Listening Antarctica s Broadcaster Don Jensen 73 Circuit Circus Power Up Charles D Rakes 76 Think Tank Doorbell Circuits John Yacono RTMENTS 4 Editorial 6 Letters 8 New Products 10 Electronics Library 81 Popular Electronics Market Center 114 Advertiser s Index 114A Free Information Card Popular Hectron onics Larry Steckler EHF cer editor in chiel and publisher EDITORIAL DEPARTMENT Dan Karaglannis editor feos Teri Scaduto assistont editor Evelyn Rose editorial asistani i Joseph J Carr KAPY aY contributing editor Marc Ellis serial othe Jeffrey K Holtman zoni pating editor 1 Fe Don Jensen contributing e adiar Charles D Rakes contributing editor Mare Saxon ee Mare Spiwak contributing editor late Yacono cantelbutinng editor Scat PRODUCTION DEPARTMENT Ruby M Yee production director ji Ken Core
238. ny messages But no matter what your concern is we re sure the Decoder will have you pulling pager messages off the airwaves in no time The story begins on page 39 This month s cover story is just another example of the latest in technological coverage that Popular Electronics has to offer And as always we take pride in providing you with that infor mation in a form you can actually use With a constantly evolving field like electronics things are always changing So feel free to peruse our pages often Because with technology the best is always yet to come Dan Karagiannis Editor Your Ultimate Source For Electronic Components Internet Access 24 hours a day seven days a week Online ordering amp stock status e Fast efficient parts search No minimum order gt P f 2 i a a s Pa o ama ad ait ma SF 4 By r x A l a ah h a 4B i NG gt i Bs y J at e 2 Fe Cy eB Po a a a 1 for Availability of Product 1 for On Time Delivery 1 for Overall Performance Same Day Shipment on orders entered by 5 00 p m central time March 1997 Popular Electronics Radar Detector Problems THE COBRA STRIKES read the review of the Cobra RDL 712SW radar detector in the January 1997 Gizmo The features sound great and for that reason had bought one a few months before it appeared in your magazine found
239. o the code practice key The wiring check having revealed no problems next took care of a few last minute details in preparation for the realignment to be attempted next The composition board rear panel which had snapped horizontally along a row of ventilation holes was neatly repaired with a pair of small mending plates fas tened thorough conveniently located holes The plates were installed out of sight on the inner side of the panel their mounting screws dressed up with deco rative washers The loopstick antenna was then securely fastened to the panel and wired in as shown in the manual Finally was ready to try a realign ment but here was frustrated Turn ing on the receiver found that a really annoying intermittent connection had developed in the dense tangle of wiring associated with V 3 the 12AX7 dual tri ode So far no amount of prodding and probing has identified the culpable con nection which makes the audio cut in and out at irregular and unpredictable intervals We should hopefully have that problem solved by next month See you then E SCANNER SCENE continued from page 63 Gettysburg Pennsylvania The phone number is 800 322 1117 ROLLING TOWER Manny W of Chevy Chase Mary land writes that when he went to an air show at an area airport the air show activities were being run from a mobile control tower parked next to the runway His scanner was programmed with the airports r
240. o on our infrared 8 Relay version R45 SA Kit 69 Asm 99 mel OA Kit 79 Asm 109 8 input Scanner Send a single ASCII character to ask for logic status of the 8 in puts board responds with numbers O to 255 Use to control other devices based on input detected Perfect for detecting sensor status 8SC Kit Ee Asm 49 ARE YOU LOOKING FOR hw NEW AND MOST INNOVATIVE ee world wide products hard to find unique amp IF SO WE HAVE JUST THE RIGHT PRODUCTS FOR YOU PRODUCTS FOR ALL AGES CAN BE FOUND IN OUR CATALOGS THE BEST KNOWN BRANDS SUCH AS IBM ACER ARMNOTE TOSHIBA NUREALITY QUORUM FUJI PANASONIC AND SO MUCH MORE WE ALSOCARRY A WIDE RANGE OF PRODUCTS LIKE COMPUTERS MOTHERBOARDS KEYBOARDS MODEMS MONITORS CHIPS ELECTRONIC COMPONENTS CABLES ADAPTERS HARD DRIVES LAPTOPS BUSINESS OPPORTUNITIES SECURITY ALARM SYSTEMS ALL YOU HAVE TO DO IS SEND 9 00 U S 15 00 CND TO BECOME A LIFETIME MEMBER OF THE GREAT SELECTION OF PRODUCTS THAT MANA ELECTRONICS H4S TO OFFER INSTEAD OF SEARCHING WE SEND IT RIGHT TO YOUR HOME PRODUCTS ARE FACTORY FRESH WARRANTIED AND REFUNDABLE WE OFFER DEALS DISCOUNTS PROMOTIONAL GIFT ITEMS TO OUR MEMBERS WHILE YOU ARE CURRENTLY UPDATED WITH CATALOGS OF THE NEWEST AND MOST INNOVATIVE ELECTRONIC PRODUCTS AVAILA BLE TODAY only 9 00u s 15 00CND 30 DAY REFUND order now AND GET A FREE PEN MANA ELEC TROIMCS CARTWRIGHT RD SEND CHEQUE OR MONEY ORDER TO P O Box
241. ob of wiring this kit We also cleaned off the grime and checked the tubes After replacing the electrolytic capacitors a standard procedure prior to recommis sioning any antique set and installing a modern silicon diode rectifier in place of the old selenium job we powered up the radio and tried it out The results were disappointing A few weak sta tions were heard on the broadcast band nothing on the shortwave bands At the close of the November col umn we announced the strategy for future work sessions Once the manual was obtained we would make a detailed check of the set s construction to be sure that the wiring was done cor rectly If the Star Roamer could be brought back to life through finding a mistake fine Otherwise we would pro ceed with a realignment of the radio CONTINUING THE TROUBLESHOOTING The comprehensive Knight Kit man ual supplied as an excellent quality re production by Hi Manuals P O Box 802 Council Bluffs IA 51502 made it really easy to do the wiring check In the past I ve been annoyed at the relative ly high prices of manuals for units origi ANO v 3249 O6 BAWA ti BINVIVE I 2 8 Laino o1ony Guvs 99W99 va LAeNt VWNOIS ON NOILISOd 1 ONVO MII WANIXYN Nt MMOHS 1 6 WAIN LIOA JU OOO OZ Hila EIGGYHO OL DILVSION SLNIO WOWs OIBNSVENW S3H VLIOA AOZT NMOHE SIOVWLIOA NIY CANZAZUNGWIN 3OVLIOA uae tw Ow ONNOYS SISSYHI if 0314
242. og 661 Yale an March 1997 Popular Electronics oo Q ALFA ELECTRONICS DMM 89 179 00 DMM A91 Most Advanced DMM 49 95 80 7 to 81 4 dBm with 40 12000 NOW 39 00 20 reference impedances Hyn RMS ma requency counter 100 Hz 10MHz Solar Cell Powered Large Display Capacitance 5nF 50mF Measure AC volt to 20kHz 5000 counts 0 1 basic accuracy aah Auto manual range fast bar graph Diode Continuity Min Max Ave DH Relative Zoom Volt Amp Ohm Data Hold Auto power off 7 functions 19 ranges Auto power off 3 5 Digit 0 6 accuracy Input waming Splash proof Auto Manua ranging Energy saver Volt amp ohm logic diode continuity Student amp hobbyists favor Ruggerdized case Rubber holster included LCR Meter 814 189 95 Best Resolution LCR inductance 200uH 200H Capacitance 200pF 20 000uF Resistance 20 20MQO Resolution of 0 1u0F 0 1pF and 1mQ are useful for high frequency and SMD Dissipation factor indicates leakage in capacitor and Q factor in inductor horar Zero adjustment to reduce parasitics Best for design incoming Best for high frequency RF testing amp production SMD and chip component test probe SMD and chip component 25 00 E test probe 25 00 Padded deluxe case 8 00 LCR Meter 131D 229 95 E Most Advanced LCR 7i Dual display L Q or C D T inductance 10mH 10 000H Capacitance 10nF 10mF Resistance 100 10MQ i Auto manual range Dissipation factor amp Q factor
243. ones and clones see top This sample Collect Analysis Display see bottom shows legitimate calls granted and calls on clones that were terminated stolen the owner reports the theft to any law enforcement agency in Los Angeles Orange or San Diego coun ties Immediately a code and VIN is entered into the California Depart ment Of Justice Stolen Vehicle Recov ery Network computer In seconds the computer determines if the car is equipped with LoJack If the answer is yes ten high powered activation transmitters located throughout southern California broadcast a unique coded radio signal This signal automatically activates the LoJack transponder hidden in the vehicle so it starts transmitting a silent homing signal Police cars and helicopters equipped with LoJack tracking com puters this includes nearly 500 L A County squad cars receive the signal that is used to track the vehicle until it is located and recovered Since its introduction in the early 1990s LoJack has turned in an amaz ing 94 recovery rate in Southern California Most recoveries happen within two to three hours the record being a mere three minutes In addi tion the Southern California LoJack system has uncovered 45 auto theft rings and chop shops The Lojack system is installed in a vehicle for a one time cost of around 600 and there are no further monthly fees The LoJack transmitter is about the size of a chalkboard erase
244. ons permitted after the closin date No copy changes can be made after we have typeset your a NO REFUNDS eas credit only No phone orders CONTENT All classified advertising in POPULAR ELECTRONICS is limited to electronics items only All ads are subject to the publishers approval WE RESERVE THE RIGHT TO REJECT OR EDIT ALL ADS AD RATE a 517 Send you ad payments to td Mainemum 26 25 POPULAR ELECTRONICS 500 Bi County Blvd Farmingdale NY 11735 3931 CATEGORIES 270 Computer Equipment Wanted 300 Computer Hardware 330 Computer Software 360 Education 390 FAX 100 Antique Electronics 130 Audio Video Lasers 160 Business Opportunities 190 Cable TV 210 CB Scanners 450 Ham Gear Wanted 480 Miscellaneous Electronics For Sale 510 Miscellaneous Electronics Wanted 540 Music amp Accessories 570 Plans Kits Schematics 630 Repairs Services 660 Satellite Equipment 690 Security 710 Telephone 720 Test Equipment CLASSIFIED AD COPY ORDER FORM Place this ad in Category Special Category 20 00 Additional 70 gS 31 8 54 23 7 ho 38 56600 39 S0R 2 M F Total words 1 75 per word 8 Bold Face 0 40 per word __ i 5 Special Heading 20 00 T f TG 43 50 EDETEN Other A e 8 Total classified ad payment enclosed TOTAL COST OF AD A Check Mastercard Visa Discover Card _
245. onsult on any device system project electronic computer mechanical pua eg phone auto security radionic lab energy HV EM RF radar ultrasonic IR UV for business and personal invention needs Describe amp include nonrefundable 30 pre engineering fee Time amp cost estimates 7 10 days Confidentiality guaranteed CELLPRONE See our Catalog for our infamous cellphone modification guide 59 detailed com prehensive covers all makes 10 times more info than competitor s guide E vee CONS amp SCAMS 29 SECRE1 BS AX 4 mously and with little fear of prosecution Orders 505 439 1776 BLIET mr bie hide behind its aya Learn how to trace e Add 5 S H US Can 10 Off orders 100 WTI Re eel ame ga ae ulnerabiliti exposed OFF TH E SHELF 100 enoa detailed include i front TEMPEST Van Eck tapping spoof Writers Security Surveillance RF EM amp measures security checklist mers Neurophone Rife Resonant Crys Disguisers Lineman s Hand sets Bug W R FAKING Finder Panic Button Shriek Module JAN HORSES WORMS etc are imple Ghost Busters Hearing Assistor Vor isk filled with hacker text files defeats glossary much more Invaluable way of defeating Caller ID ANI 69 57 an ESS SS7 E 911 various CLASS services ANSWERING MACHINES 2O them into mini VMBs and countermeasures As a special service to our
246. operative learn ing writing creativity and a lot more all with the animated characters that lots of kids know and love Any kid that likes the magazine will enjoy this disc and you only have to pay 39 95 to bring it home New from Activision is Muppet Treasure island an interactive game based on the movie Children can join characters from the movie and many other popular Muppets in this swash buckling multimedia adventure There are plenty of places to visit many things to learn and plenty of laughs Puzzles activities and games round out the entertaining disc Muppet Treasure Island has a suggested retail price of around 49 Where in the World is Carmen Sandiego is one of the oldest multime dia titles for children that know of It s been around since the beginning of WHERE TO GET IT Access Software Inc 4750 Wiley Post Way Building 1 Suite 200 Salt Lake City UT 84116 CIRCLE 60 ON FREE INFORMATION CARD Activision 11601 Wilshire Blvd Suite 300 Los Angeles CA 90025 CIRCLE 61 ON FREE INFORMATION CARD Bose Corporation The Mountain Framingham MA 01701 9168 CIRCLE 62 ON FREE INFORMATION CARD Broderbund Software Inc 500 Redwood Bivd Novato CA 94948 CIRCLE 63 ON FREE INFORMATION CARD Creative Multimedia 225 SW Broadway Suite 600 Portland OR 97205 CIRCLE 64 ON FREE INFORMATION CARD Inscape 1933 Pontius Avenue Los Angeles CA 90025 CIRCLE 65 ON FREE INFORMATION CARD Knowle
247. oprocessor has 90 of the features of the original Reality Engine In fact it consists of two separate pro cessors A signal processor does the geo metric calculations N64 games are based on 3D polygons with characters and back grounds created out of geometric shapes A display processor which actually gener ates the screen images also takes care of such features as texture mapping and Z buffering Advanced texture mapping al lows developers to add reality enhancers such as shadows that follow a character and mood enhancers such as smoke and P i Additional Nintendo 64 game controllers are available in a variety of colors fog to obscure objects but not fully hide them Z buffering makes it possible for the system itself rather than the games to determine which parts of the image are hidden behind others in each 3D scene Together the two processors produce lifelike three dimensional images and 360 degree movements The Reality Coprocessor also handles anti aliasing which smoothes images by reducing the jagged edge effects often seen in bitmap images and MIP mapping which im proves the appearance of a textured surface by changing the image depending on the viewer s distance from it MIP mapping keeps an object clear when you zoom in on it or view it from afar Memory saving features like Z map ping are particularly important because Nintendo decided to forego the memory dense CD ROMs used in Sega Satu
248. or pulse output from C7 a Via some coupling circuit error pulses could be routed to a doorbell sounder while accuracy IC5 a IC6 a ACCURACY PULSE Fig 2 This block diagram is an early concept for a circuit that unlocks a door after the right num ber of button presses occur in a specific amount of time IC2 a 1 6 4050 Qi PN2222 1 6 40106 5 PUSHES 7 PUSHES 5 3 a LJ LED1 LED2 LEDS R7 J READY JL ACCURACY ERROR 27K y R9 wh R11 R12 Q2 Q3 Q4 7 PN2222 PN2222 PN2222 R10 R12 R14 2 2K 22K i 2 2K 5 4 6 9 10 IC2 b IC2 c IC2 d 1 6 4050 1 6 4050 1 6 4050 ERROR n ACCURACY _ PULSE PULSE Fig 3 This complete circuit makes the idea in Fig 2 workable pulses could be conditioned to disen gage a door lock solenoid However there are some bugs in this basic design solved by the more complex circuit in Fig 3 Pushbutton S1 is debounced by R1 C1 and IC1 a The first push of S1 removes the high on the reset line of counter IC4 by triggering one shot IC3 a The reset line is then held low by subsequent pushes of S1 thereby allowing IC4 to count the subsequent pushes of S1 as fong as S1 is pushed rapidly enough Too long an interval between the push es of S1 will cause C4 to reset by allowing the pulse from IC3 a to time out That interval is determined by R2 and C2 Four of the output lines of IC4 are selectable Counts 4 through 7 Count 4 output represents 5 pus
249. ower to the load As long as the load current is greater than the SCR s minimum hold ing current the power will remain on Closing S2 momentarily shunts the open Wire solder ete 4 Ege 2 tae load current around the SCR allowing it to turn off and opening the circuit to the load This occurs as soon as you release S2 The SCR type should be selected to meet the demands of the load circuit and power supply Always select a device with a higher current and volt age rating than the application calls for A little safety factor here is a cheap insurance policy and will save the trouble and cost of buying more thyristors STEPPER AND DRIVER Our last and slightly more involved entry see Fig 6A this time around is a sequential stepper and driver circuit This was originally designed as the sequential driver for a setup that per formed six different tests on an elec tronic component The circuit uses a seven segment LED display DISP1 to show the step position Two gates of a quad two input NAND gate IC 4011 1C1 a and IC1 b are connected in a bounceless switch set and reset latch circuit make sure to ground pins 8 9 12 and 13 of IC1 to ground Each time S1 is moved from the position shown to the other position and back the output at pin 3 of IC1 a toggles sending a clock pulse to the clock input of IC2 a 4017 CMOS decade counter divider That 4017 is connected in a counter circuit that
250. pera tional micromachines begins on a sil icon substrate Scientists deposit layer of electrically insulating materi al followed by a film of polycrystalline silicon for use as electrically con ducting lead ins On top of these a temporary veneer of silicon dioxide is put down so called because ifs pur pose is to serve merely as a support while the rest of the structure is bulh When the silicon dioxide is removed by several etching processes Open ings through the oxide allow the next layer of polysilicon to anchor to the insulating layer on the substrate The Continued on page 62 9iU01 09 9 JEINdOY Z664 Y21EW on March 1997 Popular Electronics oH PAGER DECODER Continued from page 44 for obvious ground planes If the de modulator is an MC3361 then pin 15 of that chip is ground Be careful when working on your scanner Its internal circuitry is proba bly densely packed surface mount components Use a small low power soldering iron a steady hand and a magnifier if necessary It is easy to really mess things up if you are not careful When closing up the case be sure not to crush any wires you added Using a Uniden SC 150 Scanner Although not the best choice for a high tech feature rich scanner the Uniden SC 150 is a good choice for dedicated pager data monitoring because of its price approximately 160 and its coverage of the 929 932 MHz paging bands To use this scan ner with
251. plications accepted for filing in a number of different two way com munications services are now com bined into a single weekly publication available free on the World Wide Web This publication also includes applica tions that were returned for correction amended substantially since prior ac ceptance for filing and resubmitted after being bounced The following FCC services are covered Broadcast Auxiliary Marine Public Coast Alaska Public Fixed Aviation Ground Advisory En Route Fixed and Contro Tower Commercial Mobile Radio Services and Fixed Microwave Services The weekly notice is updated to the Web at the URL http www fcc gov Bureau Wireless Public Notices index html That file name is based upon the week of publication and is displayed as WTB Applications Released XX Week of the Month These notices remain on the Web for one month and then they are overwritten with the following month s publication Questions about this service can be answered by the FCC s Wireless Tele communications Bureau Consumer Assistance Branch which is located in continued on page 66 SoUOI a JeindoYg Z664 Youeyy 63 March 1997 Popular Electronics ANTIQUE Radio Back to the Star Roamer ell at long last managed to break out the soldering iron dust off the workbench and get back to work on the Star Roamer project begun in the September and November 1996 issues and put aside for various r
252. problem The difficulty with joining a microcircuit to a micro machine has been that the aluminum circuit connectors if formed first melt when the micromachines are heat treated If the gears are not heat treated to approximately 900 Cen tigrade researchers say they curl like potato chips If the micromachines were fabricated first their elevation above the chip surface would create bumps that distort the delicate pro cess of etching accurate microcir cuits At this scale five microns is a mountain Sandia s micromachines are ap proximately one millimeter square The machines currently are embed ded In chip trenches six millimeters deep producing a single level struc ture suitable for accelerometers and other sensors Three level structures have been fabricated to a depth of 18 microns These are capable of turn ing external gearing and are com pletely compatible with the new integrated technique L The process can produce a wide range of micromachine systems be cause it allows independent op timization of micromachine and microcircuit performances said Mc Whorter thereby achieving the para doxical but desirable result of larger more powerful micromachines with smaller transistors The Sandia engine and gearing ex tend a micromotor construction tech nique first developed at UC Berkeley The basic batch process which wher perfected should allow production of thousands of fully assembled o
253. r Pay per view HBO Cinemax Showtime Adult etc 16 95 2 00 Pope Schematics for Videocypher Plus 20 00 Sene matics for Videocypher 032 15 00 Collection of Software to copy and alter EPROM codes 25 00 VCII Plus EPROM binary and source code 30 00 CABLETRONICS Box 30502PE Bethesda MD 20824 DSS Hacking How to construct and program smart cards w pici6C84 software Complete DSS system schematics 16 95 CABLE TRONICS Box 30502R Bethesda MD 20824 OBTAINING Sound for your VCII and VCH Plus is easy No codes needed Aiso DSS Test Card information Details 1 800 211 5635 pis aa fe ey i rapido S p WATER i il a ee 3 SOUND for Videocypher il and plus without codes Free details SASE NASSIRIAN Box 382 P Rio Linda CA 95673 MINIDISH satellite systems surround sound big TVs total home entertainment systems Dis count prices Free information STAR VISION DI RECT 800 899 9707 8am 10pm Pacific STAY informed on the satellite TV underground Subscribe tothe North Star Gazer Published SECURITY ELECTRONIC sales of security systems for home apartment or business will send informa tion call 812 295 4240 BUSINESS OPPORTUNITIES 18 50 SYNERGETICS PRESS Box 809 C Thatcher AZ 85552 520 428 4073 Visa MC SATELLITE television pays Market the fastest selling digital minidish satellite home entertaln ment system Discount prices You pro
254. r TV filters eliminate C ie MICROPHONE unwanted TV channels or SA Small but mighty this little F l LT ER S interference that alters both eae eae jewel will out perform sound and video with a beep 79 Pa Most units many times its FOR CHANNELS beep beep price It really stomps out a signal The WM 2 kit is 2 thru 22 Works on cable channels 2 thru 22 a buffered wireless mike that operates from 80MHz to 120MHz FM ONLY only the frequency of any broadcast FM radio Includes NOTE All TV Filter Kit a mini electret mike 6 to 12v DC SIZE 1 25 x 1 Sold for arte a ee only You must obtain permission WM2 KIT 14 95 from your local cable company before MICRO MINIATURE using these filters on your cable system PHONE W TRANSMITTER DF 222 kit 14 95 lt A We haven t seen a smaller i neee m phone transmitter than the fm MMPT2 kit Powered by the phone it requires no battery Transmits both sides of a phone conversation to an FM radio up to a 1 4 mile away Tunable from 88 to 108MHz FM Attach it to one phone or add it to the line to pick up all incom TRANSMITTER Small but mighty it fits anywhere Phone line powered never needs batteries Transmits both sides of a phone conversation loud and clear wireless to any FM radio at great distances Variable tunes from 70MHz to 130MHz FM You can also use it aS a speaker phone SIZE 1 25 x 6 TEL B1 KIT 12 95
255. r each group The pic torial for each successive layer includes all of the parts and connec tions for the previous one The previ ously installed parts and wires are grayed down the ones to be installed in the current layer are in white It s a system that works as well for methodi cal after the fact checking as it did for the original construction My thorough check of the wiring revealed no problems or mistakes but it did clarify some points that hadn t been sure of earlier a Was the antenna loopstick an original part of the receiver or had it been wired in tater to avoid the necessity of using an outside antenna for the broadcast band b Was the disconnected Code Normal switch on the rear chassis originally the BFO switch for code reception c What had been removed from the rec tangular opening labeled key now being used for a jerry rigged IF strip connection probably for the Heath Q Fiver Though the original loopstick looked like a casual later addition it was indeed original with the receiver and is in fact the only antenna for the broad cast band The receiver s antenna and ground terminals function only on the other bands The Code Normal switch S 4 on the schematic which has already been discussed in our cir cuit description enabled the receiver to be used for code practice The missing part was J 2 see circuit description a double tip jack used for connection t
256. r so it can be hidden in about 30 different places in the vehicle It has a backup battery so it works even if the main battery is disconnected Upgrades to the system include a starter disabler and a conventional alarm system Lo Jack is operating in over a half dozen other states SatSting S2RK Advanced Tech nologies in Canada is offering its Sat Sting Satellite Based Vehicle Tracking system Based on technology de veloped for police applications in Eu rope stolen vehicles are tracked via an integrated GPS module in the vehi cle The SatSting unit has a built in cel lular based communications module that calls and alerts monitoring sta tions if the car is stolen The system can also be adapted to communicate via VHF or UHF radio frequencies The unit is small enough so its installation can be completely concealed from a thief The satSting computer can pin Amccrst in distaess Po 1 2 a pushwy one of three originally a easy 10 wnderciand buttons develo The s tvork traramns GPS ped by Rockne for tho U S cooreinaies vehole aE ra tho Custamer Morttanng tocation Centar CMC Pee ctivatas the natvok Dy identiication arc nattre of continual the eresgency te an ADF ADT Security Systems Emergency service monitoting professionals Provigers are given instantly receive a tha nature of dispatchabie address and emergency and are vehicle descriptiorlicanse dispatched to a piate number ADT databases pr
257. r two buttons allow tuning in 1 kHz increments On the AM band the outer buttons provide 10 kHz tuning steps and the inner ones tune in 1 kHz increments Because the spacing of AM stations in much of the world is 9 kHz it is also possible to configure the ICF SW1000T in 9 kHz increments Fi nally in the SSB receiving mode the outer buttons are used to tune in 1 kHz and the inner buttons provide 0 1 kHz increments However the display cannot show the 0 1 kHz steps The tuning buttons can also be used to switch the ICF SW1000T between short wave bands When the AM BAND button is held down the outer tuning buttons be come band changing controls So to tune to the same 9 630 kHz frequency of our previous example you would first tune to the 3l meter band and then use the outer tuning buttons to reach the frequency Unfortunately when tuning from one band to another the display doesn t give any indication of what band you are tuned to So for example when you tune to the 31 meter band you see the frequency of the lower band edge but there s no indica tion on the display that you re in the 31 meter international broadcast band That shouldn t be a problem for experienced listeners but it might be frustrating for newcomers The receiver enters its scan mode when either of the outer tuning buttons is held down for about two seconds The receiver will scan in either direction until a station is detected Then
258. racks play mode shuffle program continuous or press play pause fast forward reverse or stop In its primary role as a game console the PlayStation is a joy to use Sound and Continued on page 33 ionik PlayStat Adventure Down Under CRASH BANDICOOT Manufactured by Sony Computer Entertainment America 919 East Hillside Blvd 2nd Floor Foster City CA 94404 Tel 415 655 8000 800 222 SONY Fax 415 655 8001 Web http www sony com Suggested retail price 59 95 Move over Mario and Sonic meet Crash Bandicoot A bandicoot by the way iS a marsupial native to Australia Sony is banking on Crash to weasel his way into game players hearts everywhere Remember The Island of Dr Moreau Well this game could have been called The Island of Dr Neo Cortex He s the arch villain who s trying to turn ordinary animals into armored beasts with which to Crash Bandicoot faces a series of Indi ana Jones style dilemmas such as being chased down a narrow lane by a huge boulder al a pe Si BANDICOOT conquer the world With the help of his assistant Dr N Brio he invents two ma chines one to give the animals superior brain power and the other to make them totally loyal to him Unfortunately they don t work as planned instead of devoted geniuses he keeps creating raving luna tics Crash Bandicoot was a reject from this diabolical program booted out for his o
259. realistic 3D hockey action with a twist a revolu tionary new passing system Icon Passing lets you bring up symbols which correspond to the geometric icons on the controller buttons under the hockey players Press one button to pass the puck to that player Use a combination of those buttons to pass it between players with lightning speed Press the SHOOT buttons immediately after passing the puck and the receiving player will shoot on goal The game also offers a host of team strategies that allow you to change your team s offensive and defensive style and even focus play around a specific hockey player Real statistics and player attributes are included for each of the 650 National Hockey League players on all 26 teams and you can invent a player to represent yourself in the game Get ready to practice your drop passes fake shots give and go s backward skating and flips try to avoid painful injuries and get ready for the winning teams exuberant celebrations Project Horned Owl Metallica a terrorist force of cyber mechs is attacking an urban city resembling Los Angeles in Project Horned Owl a futuristic action shooter game As the city is buckling street by street you become a member of an elite armed squad a k a Horned Owl whose goal is to seek out and destroy the Metallica force and its evil leader Armed with an arsenal of weapons including bombs missiles and automatic machine guns you progress thro
260. requency 10Hz 1 25GHz Display 8 digh ad Heroia MadMin Average Data hold relative mode Telescoping antenna 8 00 Deluxe case 5 00 Also Available AC DC clamp meter Light meter Thermometer meter High voltage Probe Digital oo Anemometer _ Electronic scale Force Gauge Tachometer Strobosco umidity amp EMF adapter Sound my Pl meter Frequency counter SWR field strength power meter Dip meter Digital Storage Scope DS 303 30MHZz 20M Sample sec 849 95 DS 303P w RS 232 interface 1 049 96 Switchable between digital and analog modes 2 K word per channel storage 8 bit vertical resolution 25 Lerei div Expanded Timebase 10ms div 0 5 s div Refresh Roll Save all Save CH2 Pre Trig Ptother control DC Power Supply Triple Output PS 8202 499 95 Ky Two 0 30 VDC 0 3A outputs thy One fixed 5VDC 3A output Capable of independent or racking operation 0 02 2mV ine regulaton Lay ai 2 Constant voltage and constant current mode 0 02 3mV load regulation s 1 mVims noise and ripple Ei Short circuit and overload protected oe ea PS 8200 with digital voltmeter 179 00 AA Also avaliable 30V A 60VRA 60VAA j 16V 10A 30V 10A RF Signal Generator SG 4160B 124 95 100 kHz 150MHz sinewave in 8 ranges RF Output 100mVrms to 35 MHz intemal 1kHz Extemal 50Hz 20kHZ AM modulation Audio output 1 kHz 1 Vrms Output Impedance 50 Ohm Size 5 9 H x 0 8 W x 8 1D Audio Generator AG 26
261. rload the MAR 6 device With the filter in place more of the device s dynamic range is available for amplifying LF VLF signals You can contact me at P O Box 1099 Falls Church VA 22041 via e mail at Carrjj aol com or through the magazine look forward to hearing from you B The villagers are coming up our drive way carrying torches DX LISTENING Antarctica S Broadcaster ntarctica is one of the more re mote spots on the globe And over the years only two shortwave broadcasting stations have operated from this most southern of all the continents Though the American Forces Antarctic Network s SW outlet at Mc Murdo Base has been silent for years the other Antarctic broadcaster Argen tina s LRA36 Radio Nacional Arcangel San Gabriel reportedly is alive and well after an impressive 17 years of opera tion though it has been transmitting sporadically While most nations have forsworn territorial claims to the frozen conti nent where the thermometer reads 30 degrees below zero on a typical mid winter day Argentina has claimed sov ereignty for decades It backs this contention with nearly 20 Antarctic out posts scientific bases military detach ments and since 1980 a shortwave station LRA36 is located at an Argentine Army installation known as Base Esperanza or Hope Base at latitude 63 24 south and longitude 56 59 west on the long Antarctic peninsula that juts northwar
262. rn and Sony s PlayStation in favor of silicon based ROM cartridges The decision was not made out of misplaced loyalty to an old fashioned format What cartridges lack in memory they more than make up for in speed access time is much faster than any CD based system There s vir tually no down time spent waiting for a new scene or character to appear which can take as much as half a minute with a CD ROM game That might not sound like much on paper but when you re sit Gizmo is published by Gernsback Publica tions Inc 500 Bi County Blvd Farm ingdale NY 11735 Senior Writers Christopher Scott and Teri Scaduto Copyright 1996 by Gernsback Publications Inc Gizmo is a registered trademark All rights reserved ting in front of the TV waiting and wait ing it can seem like forever You re much less likely to notice the cartridge s lack of available memory un less you re a game developer who has to be very frugal with it than the CD ROM s lack of instant access But game de velopers won t fee the memory pinch too severely According to Nintendo com pression technology allows the cartridges to store plenty of game data and the con sole s coprocessor takes over several of the memory intensive tasks that are done in the software on CD based systems For consumers looking for more memo ry an add on option called the 64DD is soon to become available The high speed mass volume disk drive attaches to
263. roject man ager in Sandia s Microelectronics De velopment Laboratory We ve cre ated a generic manufacturing pro cess Manufacturing Sandia manufac tures the machines using break through technology that etches minuscule trenches in silicon chips then fabricates the machines within these depressions like hot tubs sunk in backyard decking The heat treatec machines are then submerged anc preserved like insects in amber in c slight drop of hardening silicon diox ide If you first sink the machine in c trench and then fill in around it ir effect you ve created a pristine wafer for doing electronic processing saic Steve Montague inventor of the ap proach The hardened silicon dioxide recreates a level chip surface upon which circuitry is fabricated by the usual method of photolithography Removal of the silicon dioxide at the end of the process liberates the mi cromachines Circuits fabricated only microns from a machine eliminate ghost sig nals parasitic currents created by excess electrical capacitance in ion ger connecting wires Without this in terference by applying a mechan ical load you can measure the capacitance change in the drive gear teeth as they move in and out explains Sandia engineer Ernest Gar cia Then you know how fast the ma chine is moving Montague s method of assembling a machine and circuit on a single chip allowed the researchers to over come a basic
264. room to your desired temperature The RST 1200 oscil lates 70 distributing warmth throughout an entire room a The oscillating difference The RST 1200 is unlike ordinary space heaters Because it oscillates over a range of 70 the RST 1200 spreads the warmth created by its genuine ceramic heating element evenly throughout your room eliminating cold spots And with its solid state thermostat you can set a spe cific temperature and the RST 1200 will maintain it effectively and efficiently If youre like me you re thinking Sure that sounds like the per fect heater but there s nothing like that avail able Guess again Royal Sovereign recently un veiled a remarkable new heater that combines a ce ramic heating element with a solid state thermostat and an oscillating fan its called the RST 1200 Oscillating heater The ceramic advantage Many space heaters use a nickel coil which burns oxygen a process which can produce odors and even cause headaches Plus the heaters k t fe en Lo n npu apikan pirap ita has built in automatic overheat and tip over protection The unit will shut off if tipped over airflow is blocked or anything is spilled on it A red safety light indicates that the unit has shut itself off for some reason The RST 1200 is so safe you can let it run 24 often get hot to the touch creating RST 1200 FEATURES hours a day worry free
265. rt Orchard WA 98367 9017 need a schematic for a Sears dual cassette stereo model number 28171 chassis number 132 10102 especially need a diagram of the cas sette circuit showing the power source and a TD6301AP IC Any help is appreciated Feel free to call me at 815 589 3576 or to write ED TIESMAN 1231 12th Avenue Fulton 161252 Hello fellow readers am seeking a simple synch lock time base correc tion circuit to lock together two con sumer camcorders one VHS and the other Hi 8 The reason I m asking is because inherited a professional JVC KM 1200U video mixer and color special effects generator But it is built for cameras costing thousands of dollars that come with a synching system called Gen Lock realize I m asking for quite a diffi cult to find circuit but have used two camcorders with a Videonics MX 1 mixer and a Panasonic MX 12 mixer Because both worked beautifully believe such a circuit does exist for the JVC now have In summary can anyone help me use my cameras without the Gen Lock system can t find that gear anywhere d really appreciate any help or hints Thanks in advance for any assis tance you could provide BOB MEUSE 600 Rainbow Drive 107 Mountain View CA 94041 ia No speaker wires no power cords no kidding With variable bass response improved acoustics and technology designed to prolong battery life Recoton s newe
266. s both bells are not pulling a high current from the transformer at the same time The timer can be adjusted S91U01 99 J seindog 661 Yey 79 March 1997 Popular Electronics S to ring the bell from one to five seconds There is a Test button for ringing the bell to aid in set up The Off On switch allows the circuit to be disconnected so the basement bell will not ring Richard W Johnston Troy MI Nice work like how it doesn t need its own supply wonder how you d have to condition the signal to use a 555 as the one shot It might take a bit of thinking but then a 556 could be used for both the timer and one shot circuits SHOP BELL Enclosed is a circuit designed to enable you to ring additional door bells in adjacent areas such as basements work shops or garages see Fig 6 The circuit steals a little current from the main doorbell system via a center tapped audio transformer to drive relay RY1 RadioShack number 275 005 or 275 004 The relay closes the con tacts to a battery powered chime box making it sound out when the main doorbell is activated All the circuit does is operate the relay not the additional chimes so you can add as many battery powered FACTCARDS i e T Jampacked with information at your fingertips chimes as you d like without disturbing the operation of the existing doorbell Since have a garage that s 24 feet long and an att
267. s enters the Garden New excit ing book points out how gardeners can build simple gadgets to promote success where the elements work against you Some of the projects are over under tem perature monitoring dusk dawn switching automatic plant watering warming cables etc BP368 Practical Electronics Musical Effect Units 5 95 There is a constant hullabaloo for musical effects projects by the hobbyist community This book Provides practical circuits for several projects that range in complexity and are Sure to work All the circuits are easy to build and use readily available parts BP363 Practical Electronic Music Projects 5 95 The text contains a goodly number of prac tical music projects most often requested by musicians All the projects are relatively low in cost to build and all use standard readily available components Th project Categories are guitar general music and MIDI 100 NEW TITLES LISTED EACH MONTH CHECK US OUT BP385 Easy PC Interfacing 6 95 The built in ports in your PC provide an easy and hassle free way of interfacing your circuits This book provides useful PC add on circuits including the following Digital input output ports analog to digital and digital to analog converters voltage and current measure ment circuits resistance and capacitance meters tem perature measurement interface biofeedback monitor and many other useful interfaces BP393 Practical Concise Introduction to UNIX
268. s location This information is retained by the Lincoin RESCU system in the 1996 Continental amy The motorist pushes the Lincoln RESCU button inside the car to ia a Security Garer as part of the call i a Ao ni mee i e i gt a 5 s i iw Ea ia i D es cellular call Vehicie location and owner data are relayed to the Lincoin B i se eee Sy a ois Via cellular phone system Lincoln Security talks to the motorist confirming location and determining what assistance is needed The security agentthen brings the appropriate public emergency response agency or roadside dispatch service in on the call This drawing shows the three basic steps that Ford s RESCU system uses to get help to motorists The system can maintain voice contact with the motorist until emer gency help arrives If can notify pre designated family members or friends in case of an emergency Alter natively an estimated time of arrival of roadside assistance is provided anda callback later checks up fo find out if the problem has been resolved lf there is no response from the vehicle telephone just a press of the button the Westinghouse dispatcher will dial the 911 number in the locality nearest the vehicle location Local authorities knowing vehicle location and situa tion could then send help imme diately Lincoln Continental owners with RE SCU can register passwords with the Westinghouse Emergency Response
269. s made with surface mounted parts we have 1 CABINET the Relay Kit We supply a two pole relay 1 5 already mounted these parts You install the teaded parts Power requirement 6 to 12v DC Size 35 x 9 MMWM5 KIT 34 95 STROBE LIGHT Do you need an attention getter warning light or i flashing light for model air planes Then this kit is for you Use it as an emer Amps ea tie both poles together and get 3 DIGITAL THERMOMETER Amps Size 75 x 2 The DT 3 kit will turn your digital volt ohm RP 1 KIT 9 95 ea metet into an accurate digital thermome ter with 1 degree resolution Measure temperatures from 40 to 250F The remote sensor is 25 sq and can be mounted many feet from the meter Power 3 requirement 9V DC SIZE 2 x 1 35 oa ae ie i Uses PCB and surface i A IN O yra KIT 8 95 K A e hes veel fa better radio tower even use it on your bicycle Has a variable amon aa Palme nes Peo ea flash rate Power requirement 6 or 12v DC ners HTS Fagin counters Satellite Receivers It Size 3 5 x1 9 CAPACITANCE METER amplifies low level weak signals If the signal is ST 1 Kit 11 95 This kit will turn your digital volt meter into extremely low two amplifiers can be used in a seres o a capacitance meter Turn that junk box of 1MHz to 2 5 GHz 2 8dB NF RAN unmarked capacitors into a fortune of oe FM STEREO T SMITTER usable a leacure capacitors from 1dB compression OdBm Own your own FM radio lt
270. s up to 60MHz model HP 9060 or 50MHz model HP9 150 Both sets include a handy storage pouch and include an IC test hook adapter for the probe The BNC connector rotates to avoid cable tangle or kink Cable length is 1 4 meters PRICE EACH CATNO DESCRIPTION 1 100 HP 9060 Scope Probe Set DC 60MHz 16 49 14 49 11 58 HP 9150 Scope Probe SetDC 150MHz 24 95 21 95 18 62 Etching Chemicals Ferric Chloride Adry concentrate that mixes with water to make 1 pint of etchant enough to etch 400 sq inches of 10z board PRICE EACH CATNO DESCRIPTION 5 ER 3 Makes 1 pint 3 50 2 75 SEE OUR ON LINE CATALOG AT Thesepre sensitizedprintedcircuit boards are ideal for small produc tion runs They provide high resolu tion and excellent line width control High sensitive positive resist coated on oz copper foil allows youto go direct from your computer plot or art work layout No need to reverse art Single Sided loz Copper Foil on Paper Phenolic Substrate PRICE EACH l 10 50 CAT NO DESCRIPTION PPIO1 100mm x 150mm 3 91 x5 91 2 55 1 90 1 70 PPI14 11l4mmx l65mm 4 6 x 6 6 2 98 245 1 98 PP152 150mm x 250mm 5 91 x 9 84 540 3 98 3 60 PPI153 150mmx300mm 5 91 x 11 81 615 448 4 10 PP1212 305mm x 305mm 12 x 12 NEW 12 78 10 65 8 52 Single Sided loz Copper Foil on Fiberglass Substrate PRICE EACH CATNO DESCRIPTION l 10 50 GS101 100mm x 150mm 3 91 x5 91 3 90 2 98 2 60 GS114 1l4mmx l65mm 4 6
271. se pressing the button results in the cellular phone automatically Here s a look at how automotive electronics are helping save lives ae and thwart car theft dialing the Westinghouse Emergency Response Center in Irving Texas West inghouse Security Systems currently handles an average of 25 000 resi dential and business alarms daily with response verification within an aver age of 20 seconas When the tow truck button is acti vated the operator at the center ar ranges for appropriate roadside assistance If the ambulance button is pressed the operator wili contact the local 911 service to arrange police or medical assistance RESCU does a whole lot more than dialing the phone which is something you could probably do yourself This is the reason for the GPS receiver in the trunk Using GPS s 24 geosynchronous orbit satellites in space the vehicles location can be pinpointed to within about 100 feet Via the carbon fiber antenna on the trunk lid to avoid me tallic interference with the signal the system transmits data fo the message center This includes 1 type of alarm emergency or roadside assistance 2 vehicle identification number VIN 3 latitude and longitude from GPS 4 the last recorded speed and direction of the vehicle 5 a time tag identifying when the last position was taken and 6 a call back number The Global Positioning Satellite System continuously updates the vehicle
272. sea 73 KHZ 4 100 METERS In the United Kingdom amateurs may now use 73 kHz with very limited RF power levels The Radiocom munications Agency RA of Great Britain allows Class A licensed ama teur radio operators to use any mode of operation in a narrow band of 71 6 to 74 4 kHz or 73 1 4 kHz The total bandwidth is only 2 8 kHz which is about what a single sideband signal requires suspect CW will be quite popular on 73 kHz Hams are allowed to use power levels up to one watt effective radiated power 1 W ERP To use the band UK hams must give seven days written notice to their district Radio Investigation Service which take to be similar to our FCC Field Engineering Offices no mobile or mar itime operation is allowed Other VLF LF news from the European amateur radio front is an Internationai Amateur Radio Union IARU paper proposing an amateur allocation around 190 kHz on a shared basis with other services The French are suggesting a common European frequency near 143 to 144 kHz Other proposals from other semi official and Official groups include amateur opera tion in 132 to 140 kHz and 148 to 149 kHz What s really funny about these allo cation recommendations is that early hams operated on precisely those fre quencies After World War however when amateurs were allowed back on the air the comment was made put em on 200 meters and down they ll never get out of their backyards with
273. search for articles that contain all the terms you entered or at least one of them Next you can choose how many results come back to you Select from 4 50 returns or click on for the site to give you all the resulting articles It s also possible to sort them by most recent closest matched longest oldest or shortest first or just alphabetically You may also find articles you are looking for by browsing through the fol lowing indexes Quick Read of Today s Front Page CyberTimes Index Busi ness Digest Travel Index or Arts amp Leisure Index You might have noticed so far that didn t mention a weather section of the online paper That s because there isn t a static Times weather section Instead the site links to another site for weather This was a great idea because the link is very impressive and constantly updated There s a news ticker type banner that gives current conditions and warnings as well aS a color map Also you ll find graphical forecast boxes like you re used to seeing on the news you know the type mean a box with a name of a day and a picture of a cloud with rain or a sun etc USA TODAY While the New York Times has great national and international coverage has to devote some space to the first two words in its title New York Of course that s fine in my case consider ing that s where live However most of you reading this are not from here and What s better t
274. select items this offer you detain octal of this tremendous offer must supply S aS today time is limited lt a this special price code way This is a Complete set of security bits for all of those service applications made difficult because of tamper resistant screws Items such as Computer monitors telephone equipment cable equipment and many others Includes security tor bits security hex bits spanner bits tri wing bits and more 22 1475 Reg 3999 Sale SAVE ae A ideal for most solderirg applications Including static sensitive devices Closed loop control and digital reagout offer precise operation from 320 900 F A variety of replacement tips are available 21 1590 Reg 1190 Sale OY a T WAA sapina 34 4 T Heavy duty case is made of lightweight aluminum and designed to take rough field use Attractive black finish holds up after years of use Measures 19 x 14 x 6 21 3460 Reg 4995 Sale i fe SUl oe Authorized aii quasar Technics g casa rons vase J 54 D m pon iiuiis Original Parts nea Distributor Premier Distributor CODE POP38 CIRCLE 142 ON FREE INFORMATION CARD SOIUOIIOE W JeINdOY 7661 YaseW o N March 1997 Popular Electronics Qo co 3 MINMAX4 While they last on Gun 2 Project Energy Star Wars technol A weapons potential lOG7K KitPlans 99 50 4000 Volts 10ma High Voltage 4 Modu
275. sensitivity Sweeps to 5ns diviston Dual time base Signal delay line Y modedisplays two signals unre lated In frequency Component tester 40MHz DUAL TRACE Model 1541C V mode displays two signals unre lated in frequency Component tester 60MHz CURSORS amp READOUTS DUAL TIME BASE Cursors and readouts Model 2260 ImV div sensitivity 23 calibrated ranges malin lime base 19 calibrated ranges delayed lime base O Signal delay time V mode displays 2 signals urme lated in trequency Z axis input Single sweep 1225 20MHz DUAL TRACE Model 2120 2 Year Warranty Special 389 95 Model 2125 with delayed sweep 539 95 i imV division sensitivity AUTO NOAM triggered sweep operation gt AC TVH TVV and line coupling E Calibrated 19 step time base with x10 magnifier Compact tow profile design Affordable Spectrum Analyzers by B amp K 1 05GHz Serles Model 2625 2395 Mode 2630 w tracking generator 2995 SOOMHz Serles Model 2615 1595 Model 2620 w tracking generator 1895 WE WILL NOT BE UNDERSOLD C amp S SALES INC UPS SHIPPING 48 STATES 5 OTHERS CALL FOR DETAILS iL Residents Add 8 Tax OSCILLOSCOPES DS 603 Analog Digital Storage e 20MS s Sampling Rate 49 95 S 1360 ivi e Analog with Delayed Sweep S 1360 60 1345 40 1340 40 1330 25 1325 25 DIGITAL STORAGE Model DS 303 30 DS 603 60
276. set you back about 60 While Crash can move to either side of the screen the primary action is straight down the middle The game play remains linear despite some 3D effects At times he can circle around objects or advers aries but Crash s perspective never changes And you don t get the 360 de gree views that make Super Mario 64 so super You do however get a challenging game requiring ever increasing levels of skill on your part We found ourselves playing for hours on end and didn t come near completing the more than 30 levels of game play on the disc And Tawna who by the way looks much more like a Barbie Dol than a bandicoot is still waiting for Crash to come save her Oh well maybe one of these days Has Sony found its Sonic It just might have GAME SET WATCH Continued from page 3 and two audio settings game and custom The video settings change the in tensity brightness and light levels of the image The audio settings change equal ization The on screen menu system can be used to create custom audio and video settings to suit your tastes In TV mode there are even more audio and video settings to choose from Preset audio modes include standard music movies speech and custom set your own bass treble and balance Preset video modes are standard sports movies mild and custom which lets you adjust con trast brightness sharpness color and tint We set the GXTV up
277. simply ignoring the error correction information and extracting the data portion of each codeword however in the real world reception quality is variable and errors will be fre quent In particular a single bit error in a synchronization or address co deword can cause the entire message to be lost The error correction al gorithm is a necessity in practical de coders a quotient is irrelevant pad data with 10 zeros XOR with generator XOR with generator XOR with generator XOR with generator XOR with generator XOR with generator XOR with generator XOR with generator XOR with generator XOR with generator this is the answer SO U0s 09 9 JeINdOY 7661 YEW Q March 1997 Popular Electronics page decoder you will need a 2 con ductor cable with a 3 5 mm phono plug on both ends twisted pair is fine coax is not necessary Is acceptable to use stereo 3 5 mm plugs the ring contact will simply remain unused in the mono jacks Beware of pre made cables sold for the purpose of connecting the earphone output of one cassette player to the microphone input of an other these cables contain at tenuator resistors and will not work if you buy a pre made cable rather than making your own use an ohm meter to verify that the ground to ground and tip to tip resistances are low they should be well under 10 ohms After connecting the cable to J1 of the decoder follow the volume con frol adjusting proc
278. so available All Equipment is fully guaranteed amp comes with a 30 day money back option For More Information Call Us 24 Hours a Day At 800 332 1996 FAX 813 376 7801 1000KHz to 1 00GHz Spectrum Analyzer System Up to 500MHz Span Two bands All the advantages of a Spectrum Analyzer at a very affordable price Great for interference and signal hunting RS232 connect for logging signals to disk Real time display sweep outputs on any X Y scope Variable span and sweep rate Marker function and selectable bandwidth Demods in AM NFM WFM plus BFO for CW SSB modes For instant information use our fax back service at 317 849 8683 405 Or email Scanns www ace coms com http www acecomms com Scanns Order Line 1 888 445 7717 10707 E 106th Fishers IN 46038 Intemational 317 842 7115 Fax 317 849 8794 Email Scanns www acecomms com CIRCLE 25 ON FREE INFORMATION CARD 1 TEMPERATURE GENIE aq Ever lost frozen food because your freezer stopped The TC 2 kit would have saved you money An alarm activates i the temperature reaches a critical point Turn ceiling fans on automatically when p Many of our kits are it gets too hot This kit ales you 100mA of MoA E EE W available completely built SIZE 2 x 1 4 Power requirement 6 to 15V DC if you want to switch more power see our Tnac TP 1 or aoe RP 1 Power kit KIT 7 95 naate WIRELESS FM TV N 0 T C H Ou
279. so delve smarts and the desire CIE can into the why behind today s technol make it happen CIE is already the ogy Why does it work the way it does institute of choice for many Fortune The insights to be gained from such 1000 companies Why shouldn t you a broad rich and comprehensive be next eels an Education YES Please send me more information on CIE s Associate Degree Program CIE s Career Courses World College s Bachelor Degree Program Name Address MEE 1776 East 17th Street Cleveland OH 44114 215 781 9400 1 800 243 6446 City Phone Check for G I Bill Active Duty Veteran AH88 S91U04493 3 UeiNdoY 7661 yoey w March 1997 Popular Electronics RETAILERS THAT SELL OUR MAGAZINE MONTHLY Alaska Frigid North Co 1207 W 36th Avenue Anchorage AK 99503 California California Electronics 221 N Johnson Ave El Cajon CA 90202 Ford Electronics 8431 Commonwealth Avenue Buena Park CA 90621 All Electronics 14928 Oxnard Street Van Nuys CA 91411 Gateway Electronics of CA 9222 Chesapeake Drive San Diego CA 92123 Mac s Electronics 191 South E Street San Bernardino CA 92401 Electronics Warehouse 2691 Main Street Riverside CA 92501 Orvac Electronics 1645 E Orangethorpe Ave Fullerton CA 92631 Sav On Electronics 13225 Harbor Blvd Garden Grove CA 92643 JK Electronics 6395 Westminster Blvd Westmi
280. st wireless speakers are the best yet and they re also cordless by James Wong a few years ago thrilled at the prospect of not being restricted by speaker wires While that was convenient I soon realized that I was still limited by where the existing outlets were in my home I could enjoy my music wirelessly within my home but as for outdoors was stuck with the same old problem bought wireless speakers Uitimate portability freedom to listen to music anywhere The W445s are the ultimate in wireless speakers because they are also cordless They are powered by eight D batteries an optional rechargeable lead acid battery or AC power Put these cordless speakers anywhere you want within the 150 foot range of the transmitter indoors or out A single SECOND FLOOR a 3 O ud by Wi es Ua Speakers pick up stereo A signals through walls ceilings aad floors broadcasts to any number of speakers up to 150 feet away indoors or out Ported design enhances bass response A timer automatically cuts the speaker off after 20 to 30 min utes after the music stops or if the battery voltage drops too low Plus these portable speakers have a built in handle Great sound quality The speaker mount ed in a bookshelf sized acoustically con structed cabinet provides a two way bass reflex design for individual bass boost con trol Full dynamic range is achieved by the use of a 2 tweet
281. step instructions flow charts schematics and photos e Troubleshoot and repair e Make your own printed circuit board acetate board layouts provided e Component suppliers addresses Handy 3 ring workbench binder Electronics Fundamentals Electronic Components and their Characteristics The Op Amp Expiained e Generali Diagnostic Techniques plus much more EE ES Day Free Trial Order Form _ Yes Please rush me my copy of i O Electronics Repair Manual for only 59 95 33140 O Modern Electronics Manual for only 59 95 33141 j C Both Manuals for just 99 95 33142 may take 10 off the total price when enclose my check or credit card authorization by 3 31 97 Plus get free shipping and handling i understand that if am not satisfied may return the book s within 30 days for a full 100 refund of the purchase price ndosed I ve deducted 10 if am ordering by 3 31 97 es C Optional express delivery available In U S only Endose an additional 10 and we ll guarantee delivery within 5 business days from receipt of your order prepaid orders only no PO Boxes J O Bill me tater Induding 6 50 shipping and handting per book subject to credit approval Signature and phone number required to process your order P O Box addresses must be prepald Signature required Daytime phone Mr Mrs Ms 4 Company Street Address City State Zip i Shipping and ha
282. t ircuitMaker s PCB output capability helps you complete your design cycle by senerating a netlist that can be imported into any compatible PCB program This is iot a costly add on module it comes standard with every copy of CircuitMaker vlicroCode Engineering also offers Trax Maker a professional level PCB layout ind autorouting program for just 299 Used in conjunction with CircuitMaker l rax Maker completes a powerful end to end circuit design system fel 700 0m Xb 1 480 a b 760 0nm c d 6 477 BYc 13 24 Yd 6 768 Y voltage V Ret Ground X voltage iV a b 100 00 c d 16 7 Xs 100 0k Xb 1 000 Ye 3 033 Yd 21 60 100 ik 10k RefeGround X frequency Hz 100k VES Sres 299 YES _ Pro 90 Tso ow epee YES NO YES NO YES YES 599 CircuitMaker Shocks The Competition With An Unbeatable Bottom line Total Customer Satisfaction At MicroCode Engineering we are committed to total customer satisfaction When you purchase CircuitMaker you have the confidence of knowing that a trained staff of professionals is available to serve you after the sale Our free unlimited customer service is second to none Whether you have general or technical questions they will be answered promptly by a knowledgeable representative FREE Functional Demo A free functional demo is available on the Internet at http www
283. t Actually in the case of Nintendo 64 the answer is quite good Our unit arrived with just two games Japanese versions at that Nintendo s own Super Mario 64 and PilotWings 64 developed in con junction with Paradigm Simulation Be tween the two we could have kept playing and playing if we didn t have to stop to eat sleep and write this More to the point the games showcase the new plat form s power and capabilities and leave users panting for more As for the hardware Nintendo 64 s specs are quite impressive A 64 bit RISC CPU with a clock speed of 93 75 MHz provides Pentium like power A separate 64 bit processor is included just to handle the graphics N64 s 36 megabits of DRAM with a maximum transmission speed of 4500 Mb per second can be up graded with the addition of a plug in 64 Megabyte 3 inch magnetic disk drive which will be sold separately Nintendo teamed up with Silicon Graphics Inc SGI to create a specialized coprocessor to handle the graphics SGI had already come up with a 100 000 de vice known as the Reality Engine that had proven itself fully capable of tackling any graphics job most notably it was used for some of the special effects that made the film Jurassic Park such a megahit The challenge facing Nintendo and SGI was to take that 100 000 device and somehow make it fit in a home vid eogame console with a 250 maximum price tag The resultant c
284. t OS 9020G OSCILLOSCOPE wy Abts 2 CH BUILT IN FUNCTION s 20MHZ puacreace peace GENERATOR Order N 50 820 GENERATOR Features Wider than specified frequency response High deflection fac tor of 1mV div Wide dynamic range up to 30MHz without wave form distortion Algebric sum cf CH1 and CH2 Low drift with com pensation circuit Superb trigger sensitivity Maximum sweep rate of video signals with internal TV sync separator Jittless trigger circuitry CH1 signal output terminal avzilable Variable trigger hold off e High precision X Y phase difference measurement up to 50kHz Built in function generator with BNC ovtput of 50Q and TTL Three kinds of waveform are available with 50Q output Flat output waveform fre quency up to 1MHz Specifications Vertical deflection Bandwidth DC coupled DC to 20MHz normal AC coupled 10Hz to 20MHz normal Deflection factor SmV div to 5V div in 10 calibrated steps of 1 2 5 sequence Rise time 17 5nS or less Horizantal defiection Time Base A 0 2 1s to 0 2S div In 19 calibrated steps 1 2 5 sequence Uncalibrated continuous Control between Steps of at least 1 2 5 ithout DIGITAL MULTIMETERS NEW Dipta Overload protect 1000VDC or peak AC on all other ranges Input Impedance 10M Ohm on allranges Base accuracy range 0 5 to 1 0 Resistance 200Q 2K 20K 200K 2M 20M Audible continuity response lower than 50Q DC Voltage 200mV
285. t likely that of a newspaper boy standing on the corner and waving the latest edition to come off the press Sor Pale sso pet FT her Pire FY urk F pert i ae sae Ad the enio S SECTIONS NEWS BY CATEGORY CLASSIFIEDS i FORUMS SERVICES l SEARCH TL OF Coane TS The New York Times k ET it easy to oud any piece T information in current as wella as many past editions of this famous paper Of course in recent years that hasn t been the method of choice for distributing written news Newsstands and home delivery pretty much did away with those young lads in caps And now it looks like they ve met their match too News off the Web is becom ing a hot trend and soon it might do away with not only those selling news papers but with the paper they re print ed on as well THE NY TIMES would feel almost guilty if didn t cover this newspaper s site first That s for two reasons First the New York Times is considered by many myself included to be one of the finest papers in the world Second they have one of the finest sites on the Web All the news that s fit to print has long been this famous paper s motto Apparently the pioneer publisher has decided that all that news is fit to put on a server as well Best of all it s all available for free for the near future The only catch is that you have to take a minute to register as a user You then LATE NEWS UPDATE Greenspan Speech
286. t of memory and through a 10 bit digital to analog converter DAC and then passes through a voltage follower The HT8656A has some unique con tro circuitry that makes it more than BY DAVID WILLIAMS just a digital voice recorder The chip normally functions in an active listen ing mode In this mode recording starts whenever a sound input is de tected Recording continues until there is a 2 second of silence de tected or the DRAM becomes full At this point the HT8656A automatically switches to playback mode and re peats back whatever if heard The entire circuit runs from a single 9 volt battery B1 Capacitors C1 C4 provide power filtering and bypass ing Components Q4 R1 and D2 form a voltage regulator that converts the 9 volt battery supply to a stable 5 volts for IC1 and IC2 Transistor Q2 is used to switch the 5 volf power on and off Initially Q2 is biased off by R2 but when 1 is pressed Q2 switches on and IC1 receives power The HT8656A then immediately pulls pin 17 to ground and keeps Q2 on via D1 and R3 after 1 has been released In order to save the battery C1 automatically powers off when no sound is de tected after 2 minutes or when the play record cycle has occurred 64 times It does this by taking pin 17 high and allowing Q2 to switch back off Components R5 R9 and C12 pro vide power filtering and bias voltage SHUOIDA Q UBINdOY Z664 yorey ta on March 1997 Popular E
287. t operation EA16 segment RF signal strength bargraph va requencies are automatically saved when unit is turned off 10M Hz I 4GHz Frequency Range lsd Iso Reaction Tunes AOR AR8000 ICOM R7000 R7100 and R9000 Radio Shack Pro 2005 2006 OS456 installed and Radio Shack Pro 2035 2042 OS535 installed Modification to AR2700 required for Reaction tune Instructions included in Scout reanual EEP PRUST Ss D gt oo eet aH 08 yysyg g trondeevabeaee CC30 Carry Case AOR AR2700 scanner not sold by Optoelectronics FA CTORY DIRECT ORDER LINE 800 327 5912 5821 NE 14th Avenue Ft Lauderdale FL 33334 Visa Mastercard C O D Prices and Specifications are subject to change without notice or obligation TEL 954 771 2050 FAX 954 771 2052 Email opto igc net Internet www optoelectronics com CIRCLE 43 ON FREE INFORMATION CARD
288. ta Link system In fact if you re a Sched ule user and you re curious to see what the flashing on screen bars look like when data is being transferred just click on the Data Link button on the Schedule tool bar The FL95 has an 8K memory which is enough to store over 400 entries The dis play is a two line by 12 character LCD which has a pleasant blue RoyalGlo backlight Its keyboard is small and not quite touch typeable but it is adequate for inputting occasional entries when you re away from your PC In addition to the organizer functions the FL95 acts as a 10 digit calculator and includes metric conversion functions Password protection is also provided to keep any confidential entries secure We have never been big fans of personal organizers they always proved to be too hard to keep up to date and transferring data from our PC always seemed to be a big headache Royal s FL95 however has proven its worth to us Thanks to the Timex Data Link system and its compatibility with Microsoft s Schedule we have been able to integrate the product into our routine without having to treat it like it s a chore Will the FL95 finally make us orga nized After losing the organizer under a pile of books and papers for a couple of days we found it only after an appoint ment alarm started beeping we ve sadly come to the conclusion that no amount of electronics can help with that But as suming that we
289. talog Toll free 1 800 955 2527 or see mailing address below e Accredited by the Accrediting Commission of the Distance Education and Training Council a GRANTHAM College of Engineering Grantham College Road Slidell LA 70460 March 1997 Popular Electr Editorial Getting Your Beeps Digital pagers it seems like everyone s using them But unlike telephones which can be easily interchanged if you suspect there s a problem beepers can t be easily tested If you don t get a message did it really ever get transmitted or did your beeper fail to receive it Do you need a new service or a new device A worse problem is possible if you use an alphanumeric pager one that lets you receive text messages With these devices you could receive part of a long transmission and not know that it s incomplete because of the bizarre wording and punctuation often used by those who want to fit a lot of infor mation into as few words as possible Because pagers can t be swapped without a lot of difficulty we decided to bring you a better alternative Called the Alphanumeric Pager Decoder it s a device that will let you receive beeper messages with your scanner radio and view them on your computer Also because of the seemingly endless data storage capabili ties of modern PCs the Decoder also makes it possible to keep a running log of all the text and phone numbers you receive After all pagers can only store so ma
290. ten and learn at your own pace This is a practical easy to learn pro gram that will work for you no matter how slow a reader you think you are now The Speed Learning Program is scientifically planned to get you started quickly to help you in Spare minutes a day It brings you a teacher on cassettes who guides you instructs and encourages explaining material as you read Interesting items taken from Time Magazine Bustness Week Wall Street Journal Money Reader s Digest N Y Times and many others make the program stimulating easy and fun and so much more effective Executives students professional people men and women inall walks of life from 15 to 70 have benefitted from this program Speed Learning is a fully accredited course costing only 1 4 the price of less ef fective speed reading classroom courses Now you can examine the same easy practical and proven methods at home in your spare time without risking a penny Examine Speed Learning RISK FREE for 15 days You will be thrilled at how quickly this program will begin to develop new thinking and reading skills After listening to just one cassette and reading the preface you will quickly see how you can achieve increases in both the speed at which you read and in the amount you understand and remember You must be delighted with what you see or you pay nothing Examine this remark able program for 15 days If at the end of that time
291. teries On the front page of the online ooa EGINEN PLE a HOT SITES The New York Times http www nytimes com USA Today http www usatoday com paper you will find headline stories along with headings that indicate which section the story is found in News Sports etc Just click on a title and you ll get a summary Then you can choose to read the whole article if you like Another way to find a story you like is to use this site s search engine It s quite different from that found in the Times site At USA Today you first choose from one or more databases News Reviews Hotsites Olympics Election and Sports Then you describe what you are looking for in a few words Sports fans will particularly like the front page of this paper At the top of the screen a ticker tape application runs off the latest sports scores Apparently these ticker apps are the latest craze in online news providing Finally because we touched on the Times outside weather sites it s impor tant to note that USA Today has sever al weather reporting options available First you can view the paper s national map indicating the forecast for the day Or you can click on one of the several outside weather sites that are linked in this section Well it s about that time again Until next month hope these sources save you some time and currently some money Feel free to get in touch with me by e m
292. terns and other combat characteristics Strategy and action are combined in a real time shooting game complete with new sound effects advanced 3 D rendered graphics and faster character movement Jumping Flash 2 SCEA s Jumping Flash 2 opens with Robbit the robotic jumping rabbit from the award winning original Jumping Flash trying to save the Muu Muus poor pathetic creatures from total destruction There are six different worlds each filled with traps hidden areas suspended platforms and underwater areas to explore You must collect four Muu Muus before advancing to the next level not an easy task with Robbit surrounded by a horde of enemies that he must squish or shoot They include cockroaches hermit crabs paragliding Kiwis jumbo frogs slime and origami cranes Robbit has unlimited shooting capability and new weapons For Robbit to succeed you must sharpen your jumping skills The game is enhanced with 3D environments movie segments and hidden bonus levels Jumping Flash 2 PLAYSTATION GAMES MLB Pennant Race 3 Right Wing NHL Face Off 97 Twisted Metal 2 King of Fighters 95 Developed by SNK and aimed at males in their teens and early 20s King of Fighters 95 is an adaptation of a popular arcade game With 24 top fighters including those from Fatal Fury and The Art of Fighting 2 available to form three player teams the game provides 2000 game play
293. tes 5 gt Other Sites 5 lt A gt 19 lt Ll gt lt A HREF Other Sites 6 gt Other Sites 6 lt A gt 20 lt UL gt 21 22 lt H3 gt lt A Name Delphi Sites gt Delphi Sites lt A gt lt H3 gt 23 24 lt TABLE BORDER WIDTH 50 gt 25 26 lt TR gt 27 lt TH gt Description lt TH gt 28 lt TH gt URL lt TH gt 29 lt TR gt 30 lt TR gt 31 lt TD gt Borland Developer s Conference lt TD gt 32 lt TD gt lt A HREF http www dbex com bdc96 htm gt Borland DevCon lt A gt lt TD gt Se Neus oy gt marking document structure and for matting using plain ASCII text files rather than the binary formats used by products like WordPerfect and Word The basic structure of an HTML file appears in Listing 1 Note that there are several strings of characters enclosed within angle brack ets lt like this gt Each of those things including the brackets is called a tag There are many tags in HTML our Greatest Hits page uses the most com mon as well as a few extra powerful ones By convention tags are capitalized Any text that appears outside of a tag will be displayed on the web page Some text within tags is also dis 33 lt TR gt 34 lt TR gt 35 lt TD gt Delphi 32 lt TD gt 36 lt TD gt lt A HREF http www del phi32 com gt Delphi 32 lt A gt lt TD gt 37 lt TR gt 38 lt TR gt 39 lt TD gt cell 1 lt TD gt 40 lt TD gt Cell 2 lt TD gt 41 lt
294. th anything plugged in Front panel placement of those inputs and perhaps a few more of them would facilitate switching input sources We imagine that with the GXTV at the heart of their room entertainment centers today s electronics laden kids would tend to be plugging and unplugging devices frequently as they switched from CD to radio to videogame to videotape The swivel base however makes it fairly easy to reach the rear panel The front panel indicators and controls are found below the screen They include LEDs that light when the subwoofer and surround preset functions are in use the remote control sensor and a sensibly thor ough assortment of controls Besides POWER VOLUME and CHANNEL buttons Samsung wisely included a MENU button It can be used to call up the set s on screen menus without resorting to the remote control When in menu mode the volume and channel controls are used to move through the menus and select features and functions Finally there s a button labeled GX MODE which when pushed automat ically turns the set on and puts it into videogame mode A second GX MODE button can be found on the remote control The backlighted remote offers the usual numeric keypad power volume up and down channel up and down mute input select menu channel scan and previous channel but tons as well as a couple of controls that aren t standard fare The p stp and S STD buttons are used to adjust t
295. the bottom of the console High density 3 inch magnetic disks which are front load ed into the unit each hold about 64 MB of data It will allow players to write data to game software to save characters and games for instance Still more add on memory is available for the Nintendo 64 controller A memory pack which plugs into the bottom of the controller can be used to save a player s individual game play and controller pref erences The memory pack can be re moved and interchanged with any other N64 controller providing portable customization The controller has been designed to take full advantage of three dimensional Nin tendo 64 games Its shape is evocative of some alien space ship with three wing like handles extending out from its front At the base of the center handle is an analog 3D control stick a thumb oper ated joystick that is used to manipulate characters in their full 360 degree range of motion Exerting different amounts of pressure subtly changes the character s gait a soft touch makes him creep slow ly full throttle has him running all out The 3D joystick also provides realistic acceler ation and turning in auto racing and flight simulation games A set of four yellow buttons located to the right of the joystick is used to switch the perspective revealing objects or characters who be come hidden behind other objects in the three dimensional game In sports games the perspective but
296. thorized The amount of data you ll retrieve on any particular station is up to you so you Can call up just the basics or the SPECTRUM m Frequency Database For DOS Windows MAC SPECTRUM Winter 96 is a frequency database with over 3 Million records Data is extracted from the FCC i Master Frequency Database BY MARC SAXON ee ate a J au _ i a _ J E eg ne eee ens ee me Oe S ce eye one ee ee a spate sae at ar aa E k The BEFA CD ROM contains more a ea million s7 5 Gai F CC gt listings oa See by instant database searches Get more information at the PerCon website whole enchilada Listings are viewed on your monitor and or run off on your printer No user s manual is included with this CD ROM You can select what you want by pressing various on screen buttons and then following easy on screen instructions found installation to be a tad finicky when following the information provided The CD ROM does not practically install itself as many others on the market seem to these days The Spectrum CD ROM costs 29 95 plus shipping and handling similar CD ROMs in the Spectrum series are available U S Amateurs costs 19 95 pius shipping and one for all Canadian services is 49 95 plus shipping For more information contact PerCon Corporation 4906 Maple Springs Ellery Road Bemus Point NY 14712 Tel 716 386 6015 Web http www perconcorp com MORE FCC DATA FCC ap
297. tion Security Systems Festina Matt thd Ririt is Shaky Mish iy Phastrcss Pe a E a ee T 0717753 19 95 BUILD YOUR OWN MULTIMEDIA PC FOR Electronics Book Club VALUES TO 198 80 The leading source of information for electronics hobbyists for over 30 years Troutieshostiag amp Reaating Solid State TVs AUTOMOTIVE A ELECTRONICS A HANDBOOK vadinti amp Aapairiag Audia Equigment Hemer k Davidson 0157537 XX 44 95 Hardcover Counts as 2 0331898 XX 89 50 Hardcover Counts as 2 0157553 XX 44 95 Hardcover Counts as 2 qubk shosting d amp Regnig How to test almost sk babe 1 1554637 16 95 How to Read Electronic Circuit e Diagrams Iran fame ee l en Fay Lp adi EA EEN LUSTA r aS MAINTENANCE AND REPAIR a 0650780 XX 24 95 Counts as 2 mMosbwteshoettag Repairing Cempact Disc Players ONLY 4 95 Ena 0350787 44 95 0376115 XX 36 95 Counts as 2 0535469 29 95 REFRIGERATOR REPAIR mai 4 5869179 12 95 roubteshoating amp fepsiring VERS Basic Electronics Eai das Eatin Bantr L is vizar i Rakari t Roeden 1574E75 19 95 0241996 44 95 Hardcover 9122264 XX 39 95 024247X 49 00 0157626 24 95 Counts as 2 5872625 XX 30 00 Counts as 2 As a member of the ELECTRONICS BOOK CLUB you ll enjoy receiving Club bulletins every 3 4 weeks co
298. tons are used to posi tion the players on the field Near the yellow buttons are two others one blue one green that are used to make the character jump spin throw punches and make other moves Behind the right handle at the back of the controller is a button whose purpose var ies with the game In PilotWings 64 for instance it is used for snapping pho tographs A trigger button found on the bottom of the center handle is most often used for firing weapons Above the left side handle is found a traditional cross shaped game controller Having three handles might seem like overkill considering that game players have only two hands But the separate grips allow different hand positions for various game types For 3D action racing and fighting games you would hold the center and right handles That position al lows you to get the most out of the 3D stick You d grasp the left and center grips to be able to control both the 3D stick and the Z Trigger button for explosive action games The Super NES position holding the two outside grips is used for playing side scrolling action games action puzzle games and role playing games The Nintendo 64 console offers four front mounted controller ports Additional controllers are available at a suggested retail price of 29 95 each in five dif ferent colors yellow green blue red gray and black That allows a family of game players to readily d
299. tougher older or younger female or male Powered by 4 AA batteries Batteries not included Works with regular or multi line phones Connects between handset and phone Note will not work with cordies or handset type See entire room through es telephones kits that OR look Available custom pin sized hol Up to 100 foot range drilled for the following kits XFS108 Assembled d 269 98 95 E Z Kit ae 95 XPS1000 XLC900 and XVA250 oft se ve X XLC 900C A gl meee he VA 250C 49 95 e 88 108 MHz FM STEREO SCANNER CONVERTER KIT 800 950MHz VOICE STRESS ANALYZER KIT TRANSMITTER KIT Uninterrupted coverage of the 800 to Subject need not be present Works and right channels 950 MHz band with voices from recordings TV or Output level circuit with test points for Works with any 400 550MHz scanner radio quick and easy tuning Gain 6 dB typical Has built in microphone Transmit from any stereo audio source i Noise figure 3 dB typical Easy to use LED display output te most any FM stereo receiver WE ACCEPT CHECK VISA MC MO COD SEND MAIL ORDERS TO SHIPPING amp HANDLING EXTRA XANDI ELECTRONICS REFUNDABLE ON son Mee page SEND 2 00 FOR COMPLETE CATALOG FIRST ORDER TEMPE AZ 85285 5647 CIRCLE 134 ON FREE INFORMATION CARD See at a glance if your being lied to Separate level contro for both left soiuo0sjoajq yeind
300. transconduc tance cell double balanced mixer DBM that works to 500 MHz or so The DBM is the preferred mixer because it passes only the mixer prod ucts RF LO to the output and sup presses the original products RF and LO Thus the output selector for IF need only concern itself with the sum and difference frequencies The LO circuit in Fig 2 consists of capacitors C1 C2 and crystal XTAL1 if XTAL1 is a 3 5 MHz crystal then the 10 to 500 kKHz band will be found between 3 510 and 4 0 MHz on your HF receiver Similarly if the 4 0 MHz frequency is selected for XTAL1 then the LF VLF frequencies are translated to between 4 01 and 4 5 MHz The lat ter is preferred because the readout makes more sense to the user howev er not all ham receivers actually cover 4 4 5 MHz In either case the lower end is specified as 10 kHz but the real lower end depends on how close you can get to the LO crystal frequency The LO is suppressed in the output of the NE 602 but that doesn t mean it is eliminated altogether Also if the converter is not well shielded internal ly LO energy from the oscillator will couple to the output circuits and get through to the receiver In that case the lowest frequency covered may well depend on how close your receiver can get to the LO without overloading or otherwise responding In many 9 12VDC cases judicious building and layout might produce a converter Capable of rece
301. trol their minds Programmabie 4 audible and visual stimuli induces hypnotic trances HYP2K Kit with Book EH2 H pnosis Book amp Plans 14 95 with triggered spark switch Adjustable 50C to 3KV out p Charges up to 25KJ Programmable Output er 4 HEP1 Plans E HEP1K Kit Plans with 500J Electric Gun prototype designed jin our lab Join the research f Ballistic Velocities TCLEK KivPlans 12vDC 4 Experiment now before it Is classified as a firearm EGUN1 Plans Must be 21 for p 20 00 rchase of hardware We can design and build high voltage systems fo your spec s Call or fax us with your requirements Parabolic T Sonic Blast Pistol i distant whisper BUG Nature i capacity Great for special effects and remote fire Starting CAUTION REQUIRED E High Quality IR Nigh Vision EA with IR iluminator can heara other 3 149 50 4 Optional Wireless Retrofit transmits f Shocker 4 captured sounds to an FM radio WSK I Kit tor Wireless Option 29 50 I Vehicle Electrifier 4 Make hand and shock balls shock wands J and electrify objects Great payback for those wiseguys FIREBALL Plans engon product 10 00 H SHKIK Easy to Assemble Kit Electric Rids areas of unwanted pests Trains and conditions wild and f domestic animals Great for bams attics cellars gardens PPPIK Kit Plans 39 50 Force Field
302. truth table for iC3 input data It s about closing time here at the circus so here s hoping that at least one of the above circuits will in some way be helpful to you in any case good circuitry until we meet here again next issue ELECTRONICS LIBRARY continued from page 10 excessive zooming shaky pictures poor focus and lack of editing and continuity This book helps camcorder enthu siasts of all levels to achieve profes sional results by using creativity instead of a lot of money It provides advanced camcorder users with plenty of advice unavailable anywhere else such as how to edit between different brands of equipment to get the best Quality at the lowest cost The book covers the advantages and disadvantages of all camcorder for mats VHS 8mm Hi8 VHS C Super VHS and the new digital MiniDV cassette It discusses the differences between various camcorders and be tween editing VCRs The book shows readers how to achieve professional quality in lighting sound editing and other areas without spending a bundle The book explains how RC SMPTE and VITC time codes are used how personal computers and personal video are merging how to maximize the use of audio tracks when non linear editing can help save money and how to record the best sound It also explains potentially con fusing video terminology and jargon in plain English The Low Budget Video Bible Second Edition costs 27 95 an
303. uals guide you through your development project All programming and hardware details explained BIPOLAR PROMS 16 THROUGH 24 PINS PROGRAMMING UNIT 74SXXX AND 82SXXX FAMILY PRINTER PORT CABLE Complete schematics Learn to ens arcane pel aes A paces POWER PACK MANUAL program the LCD keypad digital 68HC705 68HC711E9 PICI6CXX TMS7742 AND SOFTWARE analog and serial I O for your applications i ADAPTER REQUIRED DIAGRAMS INCLUDED SOFTWARE READ VERIFY PROGRAM COPY THREE MODELS AVAILABLE Choose from an DISK FILE LOADISAVE CHECKSUM FULL Inte 8051 Intel 8088 or Motorola 68HC11 READS HEX S RECORD AND BINARY FILES ADD 5 00 SHIPPING based system All models come with CeO RAN eRe semcon MADE IN USA 1 YEAR WARRANTY VISA MASTERCARD pet eae TN A E ee by OE Crystal R 4 nn a ree y eypad Digital Analog and Seria e Interrupts timers chip ANDROMEDA RESEARCH P O BOX 222 MILFORD OH 45150 selects 26 pin expansion connector Built in Logic Probe Power 513 831 9708 FAX 513 831 7562 Supply can also be battery operated Powerful ROM MONITOR to help you program Connects to your PC tor programming or data logging cable included Assembly BASIC and C programming varies with model Program disks with Cross Assembler and many well documented program examples User s Manuals cover all details over 500 pages Completely assembled and ready to use Source code for all drivers and MONITOR
304. ugh increasingly difficult and dangerous levels of non stop combat action Fully interactive back grounds allow you to shoot anything in your path from blasting out windows to blowing up cars The game offers one and two player modes and three levels of difficulty Twisted Metal 2 Co developed by Sony Interactive Studios America and SingleTrac Entertain ment Technologies Inc Twisted Metal 2 is a high action car to car combat game that puts you in control of heavily armed vehicles as you search out your opponents through live 3D environments There are no pre set paths you can cut through parks drive on the sidewalk and take any action needed to defeat the competition The game begins where its predecessor Twisted Metal left off in the wake of the destruction of Los Angeles Game Set Watch GXTV MODEL GXE1395 PERSONAL VIDEOGAME TV Manufactured by Samsung Electronics 105 Challenger Road Ridgefield Park NJ 07660 Tel 800 SAMSUNG Suggested retail price 349 The family dinner as always was a noisy affair Clean up a chaotic effort in volving parents and teens is done At last you can retire to the den settle in your recliner and relax in front of the TV watching Crash and Burn MTV Gone are the days when the whole fam ily would gather around the black and white console to watch Bonanza or The Ed Sullivan Show With the wealth of broad Cast programming and other video options available to
305. ur kind generosi ty really appreciate your help And thanks to Popular Electronics for mak ing it possible R J S Harper Woods MI HAVES amp NEEDS have been singularly unsuccessful in finding a manual for a Sweet P plot ter Model SP 100 that was manufac tured by Enter Computer inc circa 1982 If anyone could help me out with the manual or point me toward a source would really appreciate it NORMAN LEET 840 Hunter Road Apt L Enon OH 45323 1815 e mail ah255 dayton wright edu have an EMC Mode 208 tube tester manufactured by Electronic Measurements Corporation New York NY The unit is housed in a small black plastic case that measures about 7 X 5 1 X 2 inches It checks the following types of tubes 7 pin miniature 9 pin miniature octal and loktal No meter movement is pro vided instead a large neon lamp is used as the indicating device need the instruction manual tube setup chart for this tester a schematic diagram also would be helpful will be happy to reimburse copying and postage costs Thanks DOUGLAS D FOX 603 S 12th Avenue St Charles IL 60174 3238 Andd ddont oa io vet o o out Web she a ati LETTERS need the instructions and or pro gramming procedures for a Curtis Mathis H Q VHS VCR Model DV 725 S N V9100406936 as this model is too old for on screen instructions will be happy to pay for any costs Thanks A DRUMMOND 4471 SE Inwood Lane Po
306. ut further delay lets get right to those circuits as well as a few others INPUT SUPPLY DOUBLED VOLTAGE VOLTAGE OUTPUT Gi 100 Fig 1 Move switch S1 to its other position and the charged capacitor will double the voltage output of this circuit PARTS LIST FOR THE VOLTAGE DOUBLER Fig 1 Ci 100 yF 35 WVDC or other rating to handle input voltage electrolytic capac tow tf 51 DPDT toggle switch Wire solder etc VOLTAGE DOUBLER A simple voltage doubler circuit is shown in Fig 1 In the circuit a 100 F electroytic capacitor is connected to the wipers of a DPDT switch and as shown is charged to the input supply voltage Throwing the switch to its opposite position places the negative side of the capacitor to the positive side of the power source As a result the positive output voltage of the circuit will be tem porarily doubled INPUT SUPPLY VOLTAGE a ee gt NEGATIVE OUTPUT Fig 2 Move SI from the position shown here to the other one and you ll have a negative volt age supply PAATS LIST FOR THE NEGATIVE VOLTAGE SOURCE Fig 2 Ci 100 uF 35 WVDC for other rating to handle input voltage electrolytic capac itor 51 DPODT toggle switch Wire solder etc NEGATIVE VOLTAGE SOURCE The negative voltage circuit shown in Fig 2 is very similar to the previous circuit but has a different output switching arrangement As shown in the schematic C1 is tied across
307. ution of the heat The RST 1200 will eliminate cold spots even in those rooms with poor ventilation Safety features The RST 1200 may be the safest space heater you can buy Its cool touch cabinet prevents the RST 1200 from being a fire hazard even when in close proximity to drap ery quilts and paper tissue The RST 1200 also where in your home In addi E Cool touch cabine tion its sleek design makes it E Compact size L i 1 duce any unwanted side effects Se ea know it s a heater a welcome addition to any deccr most people won t even Try it risk free The RST 1200 Oscillating heater is backed by Comtrad s exclusive risk free home trial Try it and if you are not completely satisfied simply return tt within 90 days for a full No Questions Asked refund It also comes with a one year manufacturer s limited warranty RST 1200 oscillating heater 99 9 S amp H Please mention promotional code 1431 PL 10175 For fastest service call toll free 24 hours a day 800 992 2966 To order by mail send check or money order for the total amount including S amp H VA residents add 4 5 sales tax Or charge it to your credit card by enclos ing your account number and expiration date INDUSTRIES 2820 Waterford Lake Drive Suite 106 Midlothian Virginia 23113 March 1997 Popular Electronics Fi E E i j D m E l F a l j ri LJ a i The Best PC E L j_J L aa i i i 1 Yo oa
308. veloped that is so advanced it actually makes conventional antennas a thing of the past It s called the Spectrum Universal Antenna Tuner Advanced technology Just imagine watch ing TV and seeing a picture so clear that you d al most swear you were there live Just plug the Spectrum Antenna into a standard AC outlet and plug your TV into the Spectrum You can remove the unsightly clutter of traditional TV top devices gathering more dust than television signals Get ready for great reception Your TV will display a sharp focused picture thanks to Spectrum s ad vanced Signal Search and Fine Tuner controls Uses your home s electrical wiring The Spectrum Antenna is a highly sophisticated elec tronic device that connects into a standard wall outlet The outlet interfaces the Spectrum Antenna with the huge antenna that is your home wiring network It takes the electrical wiring in your house or apartment and turns it into a multi tun able giant TV reception station which will improve your TV s overall tuning capability The results are incredible Just think how much power runs through your home s AC wiring system all that power will be used to receive your local broadcasting signals How it works Broadcast TV signals are sent out from the local broadcast station ABC CBS NBC etc They interface with your home s AC power line system a huge aerial antenna network of wiring as large as your home itself Wh
309. verdeveloped conscience and cast adrift As game play begins Crash has washed up on the sandy shores of N Sanity Beach two islands away He s determined to find his way back to Dr Cortex s island where the love of his life Tawna is being held captive Along the way he faces deadly pitfalls collects valuable objects and en counters increasingly dangerous enemies and obstacles Okay we ve established the genre He s collecting tropical fruits and gems instead of coins or Stars rescuing a female mar supial instead of a princess navigating through island jungles instead of a cas tle but Crash Bandicoot is an awful lot like Super Mario They have two other things in common Both characters are en dearing and both games are addictive Crash Bandicoot is one of Sony s 3D games for the PlayStation Crash moves forward deeper into the picture and back toward the player as well as left and nght and up and down which gives you the sense of moving into the game And after Crash jumps over a wall you ll want to turn him facing you to see if there s any treasure hidden behind it Continued on page 34 PLAYSTATION GAMES Aquanaut s Holiday This is our kind of video game non violent educational and most impor tant fun Aquanaut s Holiday takes kids of all ages into a world few people have experienced in real life On your 3D undersea journey you can swim along a school of rainbow color
310. vestment You can buy the Monitor as a kit from the source mentioned in the Parts List for only 10 95 Of course you can also build the circuit from scratch Tne Monitor works with a makeshift bargraph composed of seven LEDs that displays the AC line voltage in seven steps from 100 to 132 volts in approximately 6 volt steps The AC voltage in your home or office should always be and usually is within those limits But should you see that none of the LEDs are lit or if all of them are brightly lit then you know theres a problem The circuit is also a good indicator of how stable the AC volt age in your home is By now the presence of the letters AC in this article might have startled a few cautious hobbyists Not to worry though its very safe to work on this circuit because there are no harmful voltages present on the board But how can you monitor AC voltage with out ever touching it Simple use a transformer The Monitor uses a 120 volt AC to 12 volt DC line volfage adapter to supply the voltage input That not only eliminates harmful volt Build an Line Voltage Monitor Keep tabs on the level of the AC line voltage in your home or office with this inexpensive circuit BY MARC SPIWAK ages from the circuit but it also pro vides a ready made DC operating voltage for the Monitor s circuitry The transformer simply supplies about one tenth of the line voltage rectified to the unit Larger vo
311. wiring errors damaged components etc Obtaining Unfiltered Scanner Audio Every scanner is different and it would be difficult to provide specific instructions for tapping into the un fitered demodulator output for every type of scanner on the market though we will give tips for one later on Here are some general sugges tions First of all get a schematic of the scanner Without this you still might have success but its gcing to take an oscilloscope and a lot of patience Look for the audio amplifier circuit This will usually consist of two or three stages of amplification probably with a second order lowpass filter and a second order highpass filler some where in the chain Try to obtain a take off point at the beginning of the amplifier chain The signal here will probably be only a few tenths of a volt should look like scuare waves and is likely to have a lot of 10 kHz superimposed on it twice the lowest IF As an alternative particularly if you i ta ia a i AALA F L Ld 4 ry _ gt p ur t i A Fig 5 Once the board from the Uniden SC 150 is removed see text use this photo don t have a schematic look for the FM demodulator In many scanners this is the popular Motorola MC3361 chip If you find one of these in your scanner then pin 9 is the unfiltered demodulator output Depending on the externa Circuitry it is possible that pin
312. y publication The usual problem is sensitivity and results from the fact that many of these continued on page 70 22 C2 RF OUT TO RCVR Fig 3 Soup up your receiver with this VLFILF preamplifier Your Own Greatest Hits Web Style M any people make their own greatest hits tapes by record ing songs from several CDs or LPs onto cassettes You can do the same thing with Web pages And here you won t run up against any artificial 45 minute per side limits Matsscane My Faverte Siten Next time we ll provide details on how to customize it to your liking Along the way you ll learn about several begin ning and intermediate aspects of using HTML As written the page should function correctly on any modern browser capable of handling tables N Fig 1 Creare your own Greatest Web Hits page All you need to do is create a sim ple text file containing about a dozen different kinds of HTML tags In so doing you ll end up with a highly func tional Web page complete with a table of contents which allows you to orga nize your favorites by topic After the TOC comes one section containing all the URLs for each topic type When you re done you ll end up with a page that you can load at any time to quick ly navigate to all of your favorite Net sites This month we ll talk about how to use the page and integrate it with your browser for maximum productivity ft runs under both N
313. z 10MHz for intemal amp external sources 4 95 10Hz extemal 1 YEAR PARTS AND LABOR WARRANTY CALL WRITE FAX FOR FREE CATALOG Visa Master Card American Express COD Purchase Order Welcome es E Test Equipment from Tenma Fluke Hitachi Leader B K E Name Brand and Low Cost Generic Technician s Tools E OEM and Generic TV VCR repair parts and over 10 000 Semiconductors E Gaming and Amusement Repair Parts and Accessories Computer Hardware Software LAN Products and Printer Repair Parts MCM offers a comprehensive line of tools and test equipment engineered for the repair of computers TVs VCRs and more in addition you will find a wide variety of OEM and low cost generic TV VCR parts passive components and semiconductors over 30 000 items in ail stocked and ready fo ship D E sian ae SAVE Logic Puncti a 3 digit LCD aire measures i resistance capacitance frequency and amperage Also tests transistors diodes and includes logic function Input impedance 1OMohm Requires 9V battery 72 4025 Reg 675 sale a 3 95 Prices Effective January 16 1997 mrouge March 30 1997 Hours TE 7 o m 9 p i Sat 9 a m 6 p m EST For complete information on the items listed 1 8 ee MCM ELECTRONICS 650 CONGRESS PARK DR CENTERVILLE OH 45459 A PREMIER FARNELL Company A Totake Esler ELECTRONICS READERS advantage of 4m 50 on

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