Elenco Electronics MO-1251 Manual do Utilizador

X989 ELECTRONICS EXPERIMENTERS handbook.. JANUARY TELEVISION Stereo Sound Decoder Commercial Zapper High Definition YOUR HOME Acid Rain Monitor E

8 NEW B DIRECTORY OF AMERICAN RE- SEARCH AND TECHNOLOGY 1988; R.R. Bowker Company, Cus- tomer Service, P. O. Box 766, New York, NY 10011; 763 p

RADIO WAVE PROPAGATION, by Lucien Boithias; McGraw -Hill, 11 West 19th St., New York, NY 10011; 330 pages, including appendixes, in- dex, and

35mm Jl r.. Prints and Slides from the same roll Seattle FilmWorks has adapted Kodak's professional Motion Picture film for use in your 35mm came

ELI L Z SFJ TOD T. TEMPLIN STEREO TV DECODER Build your own high- fidelity MTS decoder for the finest in TV enjoyment. A RECENT SURVEY OF TELEVIS

12 NOISE REDUCTION THE STEREO DECODER DESCRIBED IN THIS article doesn't use a true dbx decoder. When we first decided to build an

JUMPER ,.¡ 1 T1 SEE TEXT 10.7 MHz IF Cl .01 J1 RF INPUT J2 MPX AUDIO INPUT _ 0 -L C4 C2 470pF - .01 C3 .05 R1 120i2 IC1 MC1358 C7 1µF 50V RF S1 AF e

The NE570 is a versatile compander. We'll use it as a simple 2:1 expander. The 75 -Hz highpass filter at the rectifier input helps to pre

117 VAC Fi 1/4A 250V D1 IN4002 LE 02 POWER, R63 1K 04 2N2222 +15V S2 25VAC 02 POWER CT IN4002 C50 2.2 NF 50V C52 2.2 NF 50V C48 2200 p F 25V C49 470µ

TOD. T. TEMPLIN STEREO TV DECODER Now that we know the theory behind MTS transmission and decoding, let's build a decoder! Part 2 IN THE FIRS

Train for Fastest Growing Job Skill in America Only NRI teaches you to service all com as you build your own fully IBM- compatible micro computer With

HITACHI SCOPES AT DISCOUNT PRICES! $100 Price Reduction V -212 NOW $379 was $475 List $560 Pius `Free' 9600 Function Generator All Hitachi

-CII- -C14- c/G C15 \ I -C19- R19 -052- C28 R25 826 R27 C36 -C29- R18 -C13- R8 -R13 814 C25 -89 1C3 /-1 -R17- -R16- i C24 R21 IC2 r-, -C12- -C18- R20

AF RF S1 SOURCE J J2 MPX - AUDIO INPUT J1 RF INPUT J3 LED2 J4 el I POWER LEFT RIGHT T CHANNEL CHANNEL CC LINE LINE W ( OUTPUT OUTPUT HEADPHONE VOLUME

22 trimmer capacitor for maximum signal strength. In practice we have found that many sets, particularly older models and tube types, radiate

- D) J SAP ADAPTER TOD T. TEMPLIN Add a second -audio -program adapter to your MTS stereo decoder! IN THE PREVIOUS ARTICLE WE SHOWED YOU how to

24 INPUT (FROM S1) R6 4.7K 11h Cl 390pF L1 á 1mH R1 47K -"NM C7 12-100pF C5 120pF 8 C2 .: 1. 3 C6 .11C. 270pF 960`- L2 1OmH 1 IC1 CA3089 C4 C3 -

FIG. 3 -THE COMPLETED SAP BOARD. Notice that only two wires have to be connected to the stereo decoder. J2 MULTIPLEX AUDIO INPUT Sl 1 HEADPHONE` VOLUM

26 3 J L PHONY BURGLAR ALARM v = Scare off burglars without emptying your wallet with this simple, inexpensive electronic "scarecrow" IT&ap

L JJ THOMAS L. JOZWIAK V 0 This pocket -size electronic Christmas tree will give your holiday lighting a new and festive look. FOR ABOUT $R) '

28 LED1 3912 LED15 LE'1MV- 3912 / LED17 N 1M lED5á R9 3912 tED12 < R10 03912 8 :/ 7 6 IC1 3909 R4 3K 5 11 2 tr+ 314 LED2 R11 3912 LED4 R12

THE BLUE BOX AND MA BELL When blue and red meant the trashing of Ma Bell HERB FRIEDMAN, COMMUNICATIONS EDITOR I POKE rHe nRFAKUP OF AT &T, MA

1r9$9ELECTRONICS EXPERIMENTER'S handbook BUILD THIS page 27 clomet:er 11 STEREO TV DECODER 23 STEREO TV SAP ADAPTER 26 PHONY BURGLAR ALARM

30 As you might imagine, even with pho- tographs billing was cumbersome and did not reflect the latest technical develop- ments. A meter didn&ap

nect from the operator with a KP tone, and then dial anywhere that was on direct - dial service: Los Angeles, Dallas, or any- where in the world if

32 service. A few days after you use an un- authorized Tcrch -Tone service, the busi- ness office will call and inquire whether you'd

LJ Miniature Wideband Amplifier JOHN CLAWSON From DC to 450 MHz, 20 -dB gain in the palm of your hand. FROM DC THROUGH TO THE MOBILE RADIO and TV fr

34 FIG. 3 -SINCE THE NE5205 FUNCTIONS as a gain block, two or more can be easily cascaded to provide additional amplification. In this circuit

EXPAND YOUR CAREER HORIZONS... START Microprocessor Technology. Satellite Communications. Robotics. Wherever you want to go in electronics... start fi

38 ^J u, S'l COMMERCIAL ZAPPER FOR YOUR RADIO MARK RUMREICH Bothered by commercial interruptions on FM? Kill `em with this zapper. MANY SMALL O

J1 RIGHT INPUT J2 LEFT INPUT C1 WV R1 47K VREF [ 3 C3 R2 47K ICI -a 1 1/4 LM324 12 IC1-b / LM324 1 I( 96 R5 47K R7 100K NY* R6 47K 1(--104Ar- C4 1 C

40 FIG. 4 -THE SQUARE WAVEFORM represents the output of the comparator; the other wave- form is the output of the envelope detector. Wi..11.11

L Concerned about acid rain? This inexpensive monitor will keep you informed. WALTER D. SCOTT ACID RAIN MONITOR THE EFFECTS OF ACID RAIN HAVE BE

2 EDITORIAL Diversity's the word! Selecting the features that go into an annual like the 1989 Experimenter's Handbook is no easy task. Th

42 PERFORATED ALUMINUM 2- CONDUCTOR CONNECTING CABLE EPDXY LID -. OF FILM CANISTER PLASTIC FUNNEL MOUNTING BRACKET 1" WASHERS SOLENOID 35MM FIL

\ I 'It (^l:^-U"l'L', ifrt? h1(}ITai dashboard has ?Iccn seen Onty in mo\ IC' and c u cats. Antorüohile ma:n- ufact

FROM BREAKER POINTS +12V INPUT CONDITIONING 0 +12V CYLINDER SELECT SWITCH CRYSTAL - CONTROLLED TIME BASE FREQUENCY TO VOLTAGE CONVERTER MAIN BOARD

PARTS LIST All resistors are 1/4 -watt, 5% unless otherwise noted. R1 -4700 ohms R2, R3, R5, R12, R14, R15, R30, R33- 10,000 ohms R4, R7, R8, R

46 L 15 DISPLAY BOARD V DISP1 DISP2 DISP3 9 10 14 1 12 1 6 4 2 0 9 2205217) ú 111111111/ 16 Q 12 f 9 a b c d IC8 74C48 7 i 2 6 8 15 R26 47052 DIS

TO DISPLAY BOARD C10 1R 136 -R27- 13281 R34 1131- I R29 ,-R30- I * D3 C15 IC12 I 1C4 -C74- -R33- I -P32- 0P2 RIl RI4 I OP1D4 1 1RI2 C1_ _.D2_ 1C&apo

48 L L Zr Sil Digital Speedometer for your Car Dual display delivers both an accurate digital readout and a rapid -read analog display. YOU PROBABLY S

P1 13.8 VOLT INPUT VCC t8 ICI MM5369 R1 22MEG XTAL1 3.58M H z ---1 l C3 T 33pF VCC 5 C4 22pf 7 10 16 2 2 --F 02 1N4004 D1 _Cl 1N4004 ^.01 R37 C2 220S

50 All resistors are Vs-watt, 5% unless otherwise noted. R1 -22 megohms R2- R5,R7,R11- R14,R25,R26,R30, R32- 10,000 ohms R6,R33 -470 ohms R8,R10,R22-

V 1129 5052 5W LEDI tED20 A . . . f O f7(: 1OOO/*/OiO4OiO 1 18 17 16 15 14 13 12 R28 22K 11 10 DISPLAY BOARD IC8 LM3914 if 4 5 R27 1K . 03 1N4001

1 built the TV myself from a kit. It started as a TV, then a computer. 1 thought, like wow, why not a stereo- satellite system too! 01586 J

lC8 I IC2, 52 } IR36 } 1C9 -R27- R28 1 R34 -R33_.. I R29 -R30- LJ DI C1t1+ IC10 I f1:13 C12 -R35- -CB- -R25- 1C3 I +1C2 -R32--- -R10- a C[0 -R31- -RS

There is a way to make sure your voice is heard -by manufacturers, programmers, and influential members of Congress. The American Home Satellite Assoc

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

U,©\\/7 OO ' LJ ó lJ L.J g OLD TECHNIQUES & NEW TECHNOLOGY It takes a more than just solder to make reliable connections. SOME CLAIM IT W

56 FIG. 1- ADJUSTABLE -HEAT soldering irons al- low you to adjust the tip- temperature adjust- ment. Other soldering irons have a single con

FIG. 4-A PROPERLY -SOLDERED terminal con- nection looks like this. FIG. 5 -A COLD SOLDER JOINT may resemble a or b. One is as bad as the other. F

58 Indium is often combined with other metals to produce a "specialty solder" for joining and sealing applications where conventional

_I PHONLINK INTERACTIVE REMOTE CONTROL Rule the world by telephone! GENE ROSETH IF YOU'VE EVER WANTED TO CONTROL AN electronic device, or m

60 SAY "ENTER FUNCTION NUMBER" I i GET FUNCTION NUMBER YES SAY "ACTIVATE (2) DEACTIVATE (3), OR CANCEL (91" SAY "MICROPHONE

All resistors are 1/4-watt, 5% unless oth- erwise noted. R1- 100,000 ohms R2 -250 ohms, 1% R3- 10,000 ohms, 1% R4, R17, R24, R27, R32, R34, R35

4 NEW PRODUCTS CIRCLE 10 ON FREE INFORMATION CARD PERSONAL SCANNING RECEIVER. AOR, Ltd's model AR900100 -chan- nel hand -held receiver offers

62 3) L J PHONLINK INTER- ACTIVE REMOTE CONTROL Rule the world by telephone! GENE ROSETH Part2 NOW 'THAT WF. KNOW A A little hit about how

%4 74CO2 RD + VD PERIPHERAL CIRCUITS Y4 74CO2 10 C21 -VD 8 20 24 2 25 IC3 SP0256-M2 23 TO DATA +VO BUS 0 D1 D2 D3 D4 D5 18 17 2-7-II-28 Ilflmm22 C24

64 TO PHONE LINE (GREEN) TIP $Ri ; - 50V 1 1/2 A' RING Q(RED) FROM IC2 PBO PIN18 R32 10K 121 2N2222 ti C12 1 200V TELEPHONE -LINE INTERFACE D7 15

YELLOW TO GREEN TELEPHONE RED LINE BLACK SOI , ^ . 117 VAC F1 -C23- + D7 R36 35 + 04 R3a) /-R32 - 03 E - -R4- -C2- 018 C11 R -R31- 5 R29' IC14

66 All resistors are 1/4-watt, 5% unless oth- erwise noted. R1- 100,000 ohms R2 -250 ohms, 1% R3- 10,000 ohms, 1% R4, R17, R24, R27, R32, R34, 83

L. J HIGH DEFINITION TV The most important change in TV technology since it was invented is just over the horizon. CREATED I3Y NEON LAMPS AND VIEWE

68 1o° 3H CONVENTIONAL TV HDTV FIG.1 -THE GEOMETRY OF TV VIEWING. With an HDTV image, a viewer can sit closer to the screen to attain a greater

ing reconstruction using two or more fields will yield a picture with unaccepta- ble blurring. That's because the picture content will be

70 required to produce a wide aspect -ratio picture. The two signals would be com- bined in a frame store to produce an HDTV image. The

L J Lo 0 o 0 HDTV UPDATE BRIAN C. FENTON HDTV- sooner than you think You COULD BE WATCHING HIGH -DEE- inition television in your home in as lit

r Electronics Paperback Books GREAT PAPERBACKS AT SPECIAL PRICES RADIO'S FIRST rwo ur.cnnls BP173- COMPUTER MUSIC PROJECTS $6.95. Shows how to

72 component, but it is time -compressed and forms a narrow band on each side of the picture (which is hidden by the normal overscan in home receiv

"41 1n?ntntntntntntntntntnfntntntntntntntnfntntntntrínrntntntlTntntntntn4Crn>tnt. ANTIQUE RADiO CLUBS WIU'iviUitiviUiUiU AAA. iviUiUiUiUi

Support America's colleges. Because college is more than a place where young people are preparing for their future. It's where America is p

L_..I In- Circuit Digital IC Tester BILL GREEN SERVICING DIGITAL ELECTRONIC EQUIP - ment is seldom easy; difficulties arise from several sourc

76 External back -up batteries are un- necessary because data and programs are stored in a special non -volatile 32K -byte CMOS RAM IC.

Ln- p N Q1 CO LO M ou m cv Cc_ M O V) I-- O O 0_ C_ r- r- cc N CO V m 0 â I° Ln CO r CO rn L0,.,- oa m U ^ OD F- o V) CY) m U z C7 } O O w ? o

78 [ + N V (D Q co _z Q 2 eet d o O , U < 0 0 0 >> ó z z z ó ó ó 7 CD C7 GO CO <n d F- H (n CO o N CO d_ CL a. H H H 0 0

AC INPUT S2 I Cl E1 -C2-- C4 k --'J - -05-- RIG I ( R4 I S13 S12 S11 f-i S9 , S7 S6 S D ' DISP SEE TEXT IC6 IC2 ICS R3 !S8 S14 S4 S3

80 C15 C12,F icIo ëa 02 FIG. 4 -STUFF THE DRIVER BOARD as shown here. Mount all parts on the component side of the board. to prepare a fro

PartPart2 LAST MONTH WE BUILT ` the tester and dis- cussed basic test methodology. Now we'll go on and provide specific examples showing how

6 cros are 12 inches or less in their longest dimensions. Ultra Max and Max Airwaves are sold individually, for the sug- gested retail pric

TEST ROUTINE TEMPLATE PART NUMBER (8 Alphanumeric Digits Maximum: NUMBER OF PINS (2 Digits Maximum, Even Numbers 4 to 24) GROUP NUMBER (1 to

LISTING 1 000 'PROGRAM (RECVTEST.BAS) 001 'TO RECEIVE TEST FILES FROM A COMPUTER 002 'ALPHA Electronics Corporation, 003 'PO

PART NUMBER (8 Alphanumeric Digits Maximum- 741,61 5 PART NUMBER (8 Alphanumeric Digits Maximum (1LS Vir NUMBER OF PINS (2 Digits Maximum, Even Num

PART NUMBLR NUMBER OF GROUP NUMBER REMARKS' Binary Data 1ui1 u11 (8 PINS Hex sP oP D(' -- 7p F F r'r F PF Alphanumeric (2 Digits (( t

L 86 J INSIDE CELLULAR TELEPHONE NOT SO LONG AGO, WHEN ONE THOUGHT of a telephone, the image conjured up would be of a jet- black, rotary-d

FIG. 2 -A CELLULAR SYSTEM DIVIDES its region of service into a number of small cells, each with its own cell site containing a low -power tran

MOBILE CELLULAR 825 835 845 851 FIXED CELLULAR (CELL SITES) / ^ \ 870 880 890 896 NONWIRELINE (A) SERVICE WIRELINE (B) SERVICE EJRESERVED FOR

printing function with the word processor, the manufacturer pro- vides options to ensure word -pro- cessor compatibility. EXACT 3.1 is also co