CrimeStopper HP-8850PR User Manual

I. 48784 _OVEMBER 1988 THE MAGAZINE FOR THE ELECTRONICS ACTIVIST! Build Your Own Printer Spooler/Buffer Make your computer available for more impor

8 ELECTRONICS LIBRARY BASIC ELECTRICITY by Gene McWhorter Written for budding scientists and curious hobbyists, from junior -high age up, this book

106 CAPACITANCE ADAPTER (Continued from page 46) between the board and the front panel of the enclosure (see photo). A strip of electrical tape ca

r Electronics Paperback Books *``, GREAT PAPERBACKS AT SPECIAL PRICES BPI 73-COMPUTER MUSIC PROJECTS ._.. 56.95. Shows Clow to use your tone compu

The Electronic Industries Association /Consumer Electronics Group has recently completed the first in a series of videocassette training tapes. EIA

EXPAND YOUR CAREER HORIZONS... w1 YiZ 1111111 =b. illik11116.'14 START WITH CIE. Microprocessor Technology. Satellite Communications. Robotics.

12 ELECTRONICS LIBRARY (Continued from page 8) How to Design Solid -State Circuits presents the DC -bias and stabilization conditions for bipolar a

options, graphics, macros, and file merges, are then covered. Virtually every important discipline in elec- tronics is covered. Some of the topics

New Products To obtain additional inlorrnation on new prod- ucts covered in this section from the manufac- turer, please circle the item's

Logic Surround active -decoding system to steer the audio signal to the left, center, right, and surround channels. That technique cre- ates a mor

z -80 2.5 MHz 280 CPU 1 25 4.0 MHz 280A CPU 1 19 280A CTC 1 69 Z80A DART 595 180A DMA 5 95 180A PIO 1 89 Z80A 510 0 5 95 Z80A S10 1 5 95 28

r SOLDER STATION ADJUSTABLE HEAT SETTING WITH TIP TEMPERATURE READOUT REPLACEMENT TIPS AVAILABLE 92.95 49.95 J 69.95 49.95 15.95 39.95 34.95 12.95 27.

á IF YOU HAVEN'T SEEN THE FREE MARK V ELECTRONICS CATALOG, HURRY UPI YOU'LL FIND EVERYTHING SUITABLE AND ESSENTIAL FOR FACTORIES,

Train with NRI for a high paying career servicing computers. DIGITAL MULTIMETER- Professional test instrument for quick and easy measurements. LESSONS

/AK. Porno Arco 211 681 6674 Tlor 62127914 FAX 211 681 3380 TVS X 9103506962 COO! KEY CORP 2 1-800-344-4539 / - - ,- 4- .- ~ ~ No ~ ~

22 State of the Art Kits by Hal -Tronix, Inc. VARIOUS CLOCK KITS HAL -5314 (Most Famous Clock Kit) $12 95 6 DIGIT ELECTRONIC CLOCK Kil OR 24 HOII{

vided to recharge the NiCd batteries while they remain in the player. To conserve bat- teries, power is shut off automatically after five minutes

24 BROWN'S PC- PEDAL If ten fingers are not enough for speedy keyboarding, try putting 'our big toe to work! The faster you type, the mor

1. Attach the through- connector to a parallel printer port and plug your printer back through the same con- nector. Do this with the power off.

26 JETSET AIRDAPTOR SYSTEM Go jirst class all the 'ar when you fly 'itll this electronic audio system that connects to the plane's ar

look and feel of an expensive high tech instrument. The Airdaptor module is powered by two inexpensive "AAA" batteries For convenience

C\Vhere can I turn for help ?// There is a way to get help when you need it. The American Home Satellite Association. An organization created exclusiv

BUILD YOUR OWN Popular Electronics° NOVEMBER 1988 Volume 5, No. 11 PRINTER SPOOLER/BUFFER Free up your computer and avoid switching cables between m

¡P1-1 \LPf-3 <P1-5 <P1-7 <P1-9 ¡P1-11 ¡\P1-13 <P1-15 <P1-17 Ep1-19 <P1-25 <P1-21 <P1-23 <P1-2B <P1-2 ' <P1-4 <

31 19 18 it 1 1 U5 E-A-/VP X1 X2 RESET INTO INT1 TO TS P1.0 P1.1 P1.2 P1.3 P1.4 P1.5 P1.8 P1.7 PO.O PO.1 P0.2 P0.3 PO.4 P0.5 PO.8 P0.7 39 ADQ_/ 38 AD;

29 39 41 43 44 59 64 68 70 74 24 26 82 84 86 88 93 94 2 4 6 14 37 47 71 Volume 5, No. 11 INCLUDING ci 12 -PAGE i CONSTRUCTION Print Buffer Spooler -

ìn o z o Ir i- K o la 1 LLI w Z S4 O RESET ch ZShown here is a top-side view pl. the Print Bu% /er /Spooler's fully- populated printed- = c

a form -feed character into the buffer after the last character received from computer A. It then enables the inter- rupt signals from both comput

34 A B WO 1 ßl:1. ifTle ir JoIT 1 I ...:...1 ... . .. .0 ICI - t 00 000 r 0- S. 94100000,00 1tt Li ,? 1 ' 1 . i I . I L. 1 s - - ... .

PARTS SEMICONDUCTORS UI -7417 hex buffer/driver, integrated circuit U2, U4- 74LS374 octal 13-type flip - flop, integrated circuit U3- 74LS74 dual

36 (or etched your own from the foil pat- tern provided), install the components using Fig. 3 as a guide. Be careful of the orientation of all

Here are your ließ FactCards! Introducing Hands -On- Electronicsa FactCards. Each issue, Hands-On- Electronics'' will present 3 new Fact

88 Ere:Wi^ FactCard MM74C946:41/2 -Digit Counter /Decoder/ LCD Display Driver Tip Units CMOS TO CMOS VT. Positive Going Threshold Voltage V =5V, VIN

HANDS -OFF INTERCOM Here's an easy -to- build, easier -to -use switchless intercom that offers all the convenience of a face-to-face conversatio

NC 852 NC i + C7 1K 10 J1 R1 2.2K R2 2.2K R3 1K Cl 47 +K C2 4.7 1 C9 .22 00C8 t R7 K j1 R6 15K R4 10K 3 MIC 1 1j0K :R8 1K R11 25K R9 4.7K C3 x 10 Ui-A

THE TV AMP Tailor TV sound to the needs of the viewer with this Duple. easy -to- build, audio amplifier BY HOMER L. DAVIDSON lust about everyone

2 Nan Nl)VI MI II I7 1,1F3fi THE MAGAZINE FOR THE ELECTRONICS ACTIVIST' Popular Electronics comes home! In September, 1958 I had the good f

42 e author's prototype was built on perf- board using point -to -point wiring. Note that U/ and U2 are located at opposite ends of the boa

RGB BLUE BOX Build the RGB Blue Box and turn your black screens blue C:4os» it o.exe Volvo* u ¿?Ire C is IOA1V Directory of C:40í FAITOfDI l 3717 3

Here's a simple adapter circuit that lets your DMM measure capacitance up to 2.2 microfarads BY JOHN CLARKE AND GREG SWAIN About the Circuit Figu

When the capacitor in question (which we'll refer to as C.) is connected to the J1 /J2 input terminals, the circuit produces a voltage -one milli

46 On the HIGH range, stray capacitance is insignificant com- pared to the value of Cx, so the nulling circuit is disabled (via S2). Similarly, the o

NOVEMBER 1988 A CHRONICLE OF CONSUMER ELECTRONICS Canon Personal Copier pg. 1 Welbilt Microwave Oven pg. 2 Vistacom Videophone pg. 3 Bushnell St

Controls are simple in the extreme. A wheel mounted on the machine's left side controls contrast and copy darkness, indi- cated by a gra

lifetime of learning to cook; so much for the magic and ease of modern microwave living. Within a week, our household had nar- rowed down the m

Star Struck STAR MACHINE (18- 3330). Manufac- tured by: Bushnell Division, Bausch & Lomb, 300 N. Lone Hill Ave., San Dimas, CA 91773. Price: $

Snap Smart RICOH COMPACT AUTO -FOCUS 35- mm CAMERA (FF -7). Manufactured by: Ricoh Corp., 5 Dedrick Place, West Caldwell, NJ 07006. Price: $250.

1 un- and -I.t '. 11 et. end Fled runic. Project jcct aye 2861 $14.95 i pEADIN6 SCHEMATICS 1535P 58.95 ELECTRONICS R 1775P 518.95 RHIN ELECTRONI

CIRCLE 36 ON FREE INFORMATION CARD Hand Glider LEKTRO BLADE RAZOR (MVB -1, LVB -1). Manufactured by: Remi- ngton Products. Inc.. 60 Main St., B

of these hot new products in a future sec- tion. Other gadgets aimed at the up -to -date home -office include electronic spellers that functio

Gizmo /Bytes Portable Personal Word p.,, nr "Personal electronics" can encompass a variety of products, including a newly introduced Perso

Tetris Game Software Gizmo /Bytes We knew it had to happen, but we're a little surprised it happened so quickly. We're talking about wh

Gizmo /6 tes Tra..ZN,rtable VCR Portability seems to be increasingly an important part of home video, as illustrated by the new Transportab

"Digital Compatible" Stereo Headphone Some portable stereo equipment is high priced enough that consumers might hesitate to lug it ar

Gizmo /Bytes Video Game Organizer Intelligent A V Remote Control Three -Way Speaker System Hands -Free Personal Headlights Video Game Organizer 1

BEGINNERS GUIDE TO VINTAGE RADIO Is your latest find a gem from radio's "golden age," or just a flea- market special? Once you know w

60 However, watch out! Not every set hav- ing a crystal is a 1920's model. Crystal sets were made as toys, educational kits, and novelty items

"regen" sets were more difficult to tune and adjust. And the multiple tuned - circuits of the TRFs made them a little more selective (a

4 Letters AUTHOR! AUTHOR! I was glad to see my story, "Mini Marque" in the September issue. But I was understand- ably perturbed to s

62 The rear view of this depression -era AC -DC radio shows its tall glass tubes. This set uses a line -cord resistor. imum compactness and minimum

former could be operated from DC as well as AC current. During the 1930's, the downtown sections of many large cities were supplied only wi

THE DC NETWORK zLet your computer solve for DC- network node U voltages and avoid brain strain 1 64 By James E. Tarchinski IN THE OCTOBER 1987 ISSU

ANALYSIS PROGRAM TABLE 1 (continued) 2440 POS = "ICS" 2450 P1S = "INITIAL NODE (The tail): " 2460 P2S = "FINAL NODE

66 INITIALIZE 11000 -106111 INSTRUCTIONS 11070 -15901 ENTER NO. OF NODES 11600 -16501 ENTER FREQUENCY 11660 -17601 DOES CIRCUIT HAVE RESISTORS? 11770

TABLE 1 (continued) 3610 INS = INKEYS : IF INS , "" THEN GOTO 3610 3620 INS = INKEYS : IF INS = "" THEN GOTO 3620 3630 &ap

68 To begin your study of Ohm's Law you'll need to measure the voltage across a resistor. Using a high impedance digital meter will pre

Measuring current requires that you open the circuit and place the meter into it as a part of the circuit. If you dig down to the bottom of y

70 -...w"1Erameii-+2`1-12421t t-'"'t Ld'amtl--1.:'V"\ USING THERMOCOUPLES This simple device generates voltage that

HEAT SOURCE COOL CONNECTIONS Fig. 2 -Since connections between thermocouples are thermocouples of opposing polarity, to connect thermocouples in ser

PARTS SEARCH I've been unable to locate T1 -the 117 -volt primary, 15 -volt secondary stepdown trans- former -for the power supply that was

NETWORK ANALYSIS: SUPERPOSITION THEOREM By Louis E. Frenzel If you can understand addition, then understanding superposition will be a snap! 74 THIS

V1= 5V I R1 = 1K R2 = 3.3K V2= 12V I VI SHORTED RI 1K R2 = 3.3K A - 2.79V B OUTPUT VOLTAGE Fig. 1 -The analysis of a circuit with more than on

76 The total -circuit current can be found by using Ohm's law: IT = V 1 /RT =15/1700= .0088 ampere That current is flowing through R1, t

nais A and B. The remaining circuit shown in Fig. 5B is the one we will Theveninize. We begin by applying the super- position method of repl

78 Not all voltage sources, of course, are batteries. Therefore, we must take a look at some practical electronic circuits and see how they are used a

Such electronic regulators work very rapidly and maintain a very constant output voltage. Such electronic regulators work very rapidly and maintain

80 *v cc B i Q1 +VCC Fig. 10 -Using an emitter -follower stage is an excellent way to lower the output impedance, and allow the amplifier to amplify

Z,/ZS = (N ,)2 /(Ns)2 Where Z, is the primary impedance, Zs is the secondary or load impedance, Np is the number of turns on the primary,

D By Joseph J. Carr, K4IPV -' ON HAM RADIO DXing the smart way SOME READERS OF THIS COLUMN complain that their amateur -radio hob- by has

tween midnight and sun -up, then you there is often a lot of DX to be heard on amateurs. But as the sun "walked" know that the wor

6 r NEW FROM ETT 1 I RATCHET - ELEVEN - PIECE RACHET TOOL KIT $10.00. Includes re- versible ratchet handle. ex- tension bar, six bits, two pr

84 Use your computer to research a car, By Herb Friedman ON COMPUTERS its options, and work out the financing MUCH AS THEY MIGHT BE DESPISED, ri

a list of individual options. Some of the items, such as the tilt wheel, are in the selected option package, so I ignore them and select only

86 DDU L By Charles D. Rakes Junkbox circuits that can make life a bit easier HOBBYISTS AND TECHNICIANS ALIKE. often find themselves in need of a

individually and respond only to their own pre-set frequency. Solid -State Night Light If you still have little tykes living at home that don&a

88 By Marc Ellis ON ANTIQUE RADIO Replacement drive belts made easy FOR THOSE OF YOU WHO MAY HAVE just joined us, we've devoted the last th

GoMASTER THE NEW ELECTRONICS WITH McGRAW- HILL'S n pony ectemnics Seines H The fast, easy and low cost way to meet the challenges of today'

92 ELLIS ON ANTIQUE RADIO consisting of tour turns of dial cord (ends tied, as before, with a square knot). The result was not only neat - l

irr By Don Jensen 7F-`[. ON DX'ING The mailbag is jammed to capacity LONE OF THE BEST PARIS Ot DOING this column is reading the mail f

94 By Marc Saxon. ON SCANNERS The sum is greater than its individual components EVERY NOW AND THEN SOMEONE comes up with the bright idea of merg- i

It's hard to believe that this year marks the twentieth birthday of the scanner. Yes, it was developed in 1968 by James A. Lovell when h

tory, and lists of toll -free numbers for air- lines, hotels, and rental cars. Published by Communications Publishing Service, 3790 El Camino, Sui

96 ELLIS ON ANTIQUE RADIO (Continued from page 92) nitely suggests some kind of a control function. The coil, with the trimmer capacitor that I

JENSEN ON DX'ING (Continued_ from page 93) lish information on shortwave radio clubs ?" Okay, Mike. There are a number of U.S. and Can

98 THERMOCOUPLES (Continued from page 73) voltage source and used for heating the junction, (see Fig. 6). The two circuits are completely in

VINTAGE RADIO (Continued from page 63) with its 4 -wire connection gave way to the 2 -wire permanent magnet speak- er. It's also important to no

THERMOCOUPLES (Continued from page 98) CONNECTIONS ON BOTTOM N. $ M. M. $ IMM111 IBM 1111111111111111 101 od-as-rl Fig. 9- Thermocouples can be joi

TV AUDIO AMPLIFIER (Continued from page 42) Shown here i.s the completed microphone assembly. The microphone is mounted to the plastic housing of

RGB BLUE BOX (Continued from page 43) the computer doesn't even know it's there. If you don't like what you see, you can return to

BROWN'S PC -PEDAL (Conrinued front page 25) before you load other programs. After becoming familiar with PC -Pedal and its various operations, y

HANDS -ON MARKETPLACE FOR SALE TRANSISTORS -tubes: MRF421 $24.00, MRF454 $14.50, MRF455- MRF477 $11.75, MRF492 $16.00, SRF2072 $12.75. SRF3800 $17

150W x 2 pre -main amplifier, kit or assembled, dyna- mite sound, 3 section tone control, class A -DC. $78. discount if wholesale, send check, M.O.