Samsung VC-9840 Manuel d'utilisateur

YOUR ONE -STOP SOURCE OF ELECTRONICS INFORMATION ICD 08559 FEBRUARY 1987 $1.95 CANADA $2.50 THE MAGAZINE FOR ELECTRONICS & COMPUTER ENTHUSIASTS au

Train for the Fastest Growing Job Skill in America Only NRI teaches you to service all computers as you build your own fully IBM compatible microcompu

Your NRI total systems training includes all of this: NF;I Discovery Lab to design and modify circuits Four-function digital multimeter with walk -you

1111111/NEW PRODUCTS 11111111 For more information on products described, please circle the appropri- ate number on the Free Information Card bound

LOWEST PRICES ANYWHERE S C E N T F CABLE -TV A T L A N T A BONANZA! ITEM SINGLE PRICE DEALE 110- -UNIT PRICE RCA 36 CHANNEL CONVERTER (CH. 3 OUTPUT

CIE MAKES THE WORLD OF ELECTRONICS YOURS. oday's world is the world of electronics. To be part of it, you need the right kind of training, the ki

Design Technology The Versatile LM723 This may well be the world's greatest power- supply IC if you can understand what it can do By J. Daniel Gi

hllllI#is STRER l February 1987 ages and correcting the latter as the load and supply voltage fluctuate. The three -terminal fixed -voltage reg- ul

V+ (9.5 to 40V) r VREF V+ Vo VOUT L- FC CL CS RS0 Vour 0.001µF Vout = [(RA + RB)/RB1Vref RA+RB=_10k VoutRange a 2 to 7 V Rc(optional) = RARB/(RA +

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At last! Here is your opportunity to take your pick from a new test equipment line that has all the features you need and more and at a price tha

V+ (9.5 to 40V) VREF VC VOUt CL CS FC VOUT 0.001µF Vout = VreflRBtIRA + RB))I(RC + RD)tRD1 RA + RB=_RC + RDa10k Vout.min. = VreflRBt(RA + RB))12V

r V+ Vc VREF VOUT V- FC CL Cs Rsc R2 VOUT 2 To 7V VREF V. VO VOUT V- FC CL CS Rsc VOUT 2 To 37V or 7 To 37V Rac Reo VOUT R1/R2 = Voutlsc40.65(Ik

V+ (9.5 to 40V) Vc your CL VC (< VCE 01, 02) RSC Rsc = 0.65/10ut 1002 = 1001 To Pin 5 or divider lout.max. 1o02max = 1.5A VouT Fig. 9. Dual

combination of ratings are relatively cheap, and smaller resistors can be paralleled to obtain the required re- sistance and power ratings. Wattage

ó co co3 Z O 0 N + c7) a o J F Y z W G G N D N U N Y O N N S Z N ÑÑ N Y O W' J O N ¢(7 ¢ ta. ó > ó Ñ Li) co - 14 14 ro g- > < o V o°

Here's your chance to win a ccmplete monitoring package from Regency Electronics and Lunar Antennas. 18 scanners in all will be awarded, in

Computer Project A $30 6 -MHz PC Speed -Up Board Gives 30% more typical operating speed to 4.77- MHz IBM PCs and compatibles without changing any pa

c Routine: IBM 8088 FC V-20 IBM 6 Mhz FC A1 8 Mhz Yours Yours Yours Yours Integer Count 24 (1.0) 23 (1.0) 9 (2.7) 6 (4.0) 24 (1.0) 26 (0.9)

EXISTING SOCKET 12 SIA AA/> R6 510 RES OSC PCLK U211 8284A RDV1 AEN1 READY VCC CLK G ND RESET 2 S201 RESET 4 0-"<-0 4 0 2 wt ái LEDI O S18

crease the performance of some types of programs. The best way to evaluate a cache program is to try it in your computer. The last problem area is

Which Way To YOUR Future? Are you at a crossroads in your career? Have you really thought about it? Are you planning for your future, or perhaps re

Fig. 3. Actual -size etching -and -drilling guide for the PCA board. handled by the RDY1 and AEN1 sig- nals. Momentary pushbutton switch SW/ wired be

the fourth law of robotics A robot shall make learning fun for man and thereby improve the quality of life for mankind. A robot is a robot is a robot.

New Technology /Projects Surface-Mount-Device Circuits: A Design & Construction Guide The author describes how to work with surface- mount technol

can be used for SMCs, to preserve their very -small -size advantage, I prefer to use very thin (20 -mil or less) single- and double -sided boar

red LED at around 100 Hz. This cir- cuit can be used as an optical trans- mitter for miniature remote -control systems, intrusion alarms, and ob- jec

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REStSTOR copE: 330 SL = 331 1 K = 302. 100K = 10y Fig. 3. A simple four- element LED bargraph or "metering" circuit. ly 0.25 " x 0.7

Fig. 4. Assembly details for the four -element bargraph circuit (left) and the assembled circuit (right). drawing than to design and assemble the ent

Fig.6. Assembly details for the light -probe circuit (upper) and a switch board for the light probe circuit (lower). timer. In operation, light fall

EMODERN THE MAGAZINE FOR ELECTRONICS 8 COMPUTER ENTHUSIASTS FEBRUARY 1987 40 72 CW Commun inCider M Elm Stree Peterboro paper towels cote slaw corn

Fig. 7. The completed circuit boards for the light probe circuit (left) and the 0.1 " -thin "sandwich" the two make (right). drill &a

ALPHA OMEGA BUY YOUR VECTOR SMT TRAINING KIT DIRECT FROM THE DESIGNER/ MANUFACTURER Special Pricing for Schools, Institutions and O.E.M.s. Parts of

Project A Stand -Alone EPROM Programmer Part 1 Read a program or copy programs from one EPROM to another with this versatile Programmer that can be ea

CLOCK IN rLn 4 13 ms 13 IC4 21 31 7) 181 191 EN RST IC5 14 15 s G R 0 1 2 3 4 5 6 7 8 9 T 12 s 13 ms 9 1 13 ms 15 S O R _JiL PROGRAM INITIATE 21C

á á â CO 00 CO CO CO CO CO ^ A A A ^ AAA ^ A < I- W Y W < Ú O O ái W 2 N Q < á< .7 ó CL N N C .- U O - V T v ^ U O it S U cog CD

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supply by dropping 0.6 volt for each of the D2 through D7 diodes between pins 7 and 22 of S03. Future expan- sion connections are also brought to PER

D8> D 1> O 2> 03 > D 4> D5> O 6> C12) C12 C11 0.14F 0.1NF R12 150 7 8 I k* 2 5 6 3 Z 4 Ic1a t 2401 o ,12V I F- 1 15 16 8 7 5 3 1

C18 1000NF C20 1000 N F and S2 or selects 1C9 and the other half of 1C8 to accept program data from the EPROM plugged into MASTER socket SO1. Only

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ftadue Ihaek Parti PIaee" PARTS FOR PROJECTS - NEIGHBORHOOD CLOSE Top - Quality Capacitors Tantalums. IC pin spacing. 20% tolerance. pF VDC Ca

o Fig. S. Actual -size etching- and -drill- o m D ing guides for both sides of project's main printed- circuit board. o O O ó p A o D O D D

o o koo00o00-0 : .00 o what method you use to install the ICs, Wire Wrap zero -insertion -force (ZIF) sockets should be used for S01, SO2 and S03.

0 0 Ì:'0 O OJ 0 LGND ! P GN 24 °° o L. Fig. 6. Actual -size etching- and -drilling guides for power supply boards. where the conductor pattern

1C2 IC4 1 `E IC6 S3 64 56 -04- -C3- -R 14- S7 -C6-Yr! v I 103 -R7- -R9- -C2 -- Cl I - C1 -RB- -610- 105 1010 DIS1 -R11- IC11 IC12 DIS2 -R3- -R4- c

pin /pad connections on the top of the board. Use only enough solder to assure a good electrical joint on the component side of the board at each co

of the foil pattern. Do not install the displays and ICs in their sockets yet. Now wire the power -supply boards, referring to Fig. 8 for de- tail

The LED hex displays should read FF if there is no program data at that address. Push the PROGRAM button and, as you release it, notice that the prog

Project Inexpensive Wireless Headphones A simple induction system lets you listen to audio sound in privacy without disturbing others in the same ro

R1i 5K er. The "receiver" then amplifies the weak signal to a level sufficient to drive headphones. Though you can purchase a com- pact b

pacitors, properly orient the transis- tor and operational amplifier, and keep all lead lengths as short as possi- ble. It is just as important t

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Project A Radio -Controlled Doorbell This wireless system makes it easy to add remotely located doorbells so that you can hear someone ringing you at

Antenna C11 10pF +6.8V 0 L1 (see text) 7 tc1 5 -60pF C3 0.1µF -6.8VO C4 0.002 N F C5 0.002pF R1 1K D5 1N34A R2 1K R3 22K C7 1 0.01µF C6 0.1pF R4 15K

"Due to high r-f frequencies, printed- circuit wiring is mandatory" volts at output pin 6. Since this is greater than the bias level de

etching- and -drilling guides, you drill all lead and pin holes. Then refer to Fig. 5 and carefully mark on the cop- per cladding only those holes in

llhI/I/HA RD WARE HACKER Illld Thermoelectric modules, multiple video monitor setups, $5 toner cartridge refills for laser printers, unique hacker sou

20 - Heat Pumped in Watts 10 - 0 I I I I I 0 20 40 60 Temperature difference in degrees C. Fig.3. In thermoelectric modules, heat pumped depe

HARDWARE HACKER ... Fig. 4. Large black dot indicates where to add filling hole to top of fresh toner tank. you'll get dramatically lower toner

Where's my CATALOG? What? You haven't seen the FREE DICK SMITH ELECTRONICS catalog? Or did someone steal your copy again? After all

IIIiI'PC PAPERS ill/It Nice and Simple: Tornado Notes and JumpStart By Eric Grevstad Let me try a theory on you: If earlier days in personal com

JumpStart (tm) Copyright 1986 Ascent, Inc. Version 1.0 18:48 Name : Working breakfast with C. Date : 82/16/87 Time : 09:30 AM Duration:

IIIIII/LETTERS ¡llhII Updates In the "100- Watt /Channel, Distor- tionless Digital Audio Amplifier Boost- er" in the Dec. 1986 issue, th

iiiiii COMMUNICATIONS Ill/Il English- Language Broadcasts BY GERRY L. DEXTER Note: This list of English - language broadcasts was accurate at the time

Time Station /Country Kol Israel RBI, East Germany RHC, Cuba Radio Nigeria 0600 Radio Canada International HCJB, Ecuador GBC, Ghana CRFX, Canada BBC,

THE AMAZING VCICE MASTEU?® ENTER THE FINAL FRONTIER OF MAN -TO- MACHINE COMMUNICATIONS There is nothing else like it. Voice Master gives both speec

Time Station /Country Frequencies Voice of Turkey BBC, England Radio Moscow Kol Israel (30) CBCNQS, Canada Swiss Radio International (30) Radio Yugosl

LETTERS (from page 5 ) home computers designed to work with TV receivers. The switch's toggle is pushed to either the DIRECT position, which is

NEW PRODUCTS (from page 49) ... . .. -... ... ., nìïNlpÏpurrrrtnrsr ? configurable for most popular dot - matrix printers and interface cards. A

Advanced Surge Protector /Filter 1! SURGE PROTECTION !! Do you want the best protection available at the best price with a lifetime warranty? The U.

Make Any Computer Do Exactly What You Want With McGraw-Hill's Contemporary Programming & Software esgn feries From Writing Your Own Programs

A Radio Controlled Doorbell (from page 75) - ANTENNA -C2- 1 Cl E, 1 C9 r Dl D3 I 117 SECONDARY- 117 Vac ANTENNA 91- S1 ' C16 R10 Fig. 6. Wiring

scope. If possible, have someone op- erate the transmitter across the room from where you are working on the receiver. Connect the voltmeter or osci

n NEWS//Il/Ill GRAY -MARKET UPDATE. The gray market labeling bill that requires re- tailers to notify consumers that they may be buying a gray- m

ATTENTION! ELCTROÂ C Co-,3 1 EARN YOUR \ B.S.E.E. DEGREE THROUGH HOME STUDY Our New and Highly Effective Advanced- Place- ment Program for experience

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PAY TV and Satellite Descrambling. A 111 PICKS UP A WHISPER 50 FEET AWAY! The model WAT -50 miniature FM tranmitter uses a 4 -stage circuit NOT t

LINEAR PARTS -Transistors: MRF454 $15, MRF455 $12, MRF477 $11, MRF492 $16.75, MRF421 $22.50, SRF2072 $13, SRF3662 $25, 3800 $18.75, 2SC2290 $19.75,

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weird Music? Now you can listen to music that's coursing through the AC wiring system of your home. Its exciting. Its soothing. It's vi- bra

SCOPE 13112pigdal etets Multltn ® Od e1 DM g38 $ 19g6 e d Test leads inl 3d 11 tur oß le+>el ranges drble detector continuity d . CaPaditance an c

Not all RCA modules are recreated equal. Competitor's rebu It RCA module 13 ir'."1 M M ./ V y J RCA rebuilt RCA module Only modul