Silicon ChipMarket Centre - August 1990 SILICON CHIP
  1. Outer Front Cover
  2. Contents
  3. Publisher's Letter: On mechanical & acoustic filters
  4. Vintage Radio: Tuned radio frequency receivers by John Hill
  5. Project: High-Stability UHF Remote Transmitter by Greg Swain
  6. Project: Universal Safety Timer For Appliances by John Clarke
  7. Feature: The Story Of Electrical Energy; Pt.2 by Bryan Maher
  8. Serviceman's Log: It was the last thing I tried by The TV Serviceman
  9. Project: Digital Sine/Square Wave Generator; Pt.2 by John Clarke
  10. Project: Horace The Electronic Cricket by John Clarke
  11. Feature: Computer Bits by Jennifer Bonnithca
  12. Feature: Laservision: High Power Communication by Leo Simpson
  13. Feature: The "Tube" vs. The Microchip by Garry Cratt, VK2YBX
  14. Feature: Remote Control by Bob Young
  15. Back Issues
  16. Subscriptions
  17. Market Centre
  18. Advertising Index
  19. Outer Back Cover

This is only a preview of the August 1990 issue of Silicon Chip.

You can view 57 of the 112 pages in the full issue, including the advertisments.

For full access, purchase the issue for $10.00 or subscribe for access to the latest issues.

Articles in this series:
  • The Technology Letters, Pt.2 (January 1989)
  • The Story Of Electrical Energy (July 1990)
  • The Story Of Electrical Energy; Pt.2 (August 1990)
  • The Story Of Electrical Energy; Pt.3 (September 1990)
  • The Story Of Electrical Energy; Pt.4 (October 1990)
  • The Story Of Electrical Energy; Pt.5 (November 1990)
  • The Story Of Electrical Energy; Pt.6 (December 1990)
  • The Story Of Electrical Energy; Pt.7 (January 1991)
  • The Story Of Electrical Energy; Pt.8 (February 1991)
  • The Story Of Electrical Energy; Pt.9 (March 1991)
  • The Story Of Electrical Energy; Pt.10 (May 1991)
  • The Story Of Electrical Energy; Pt.11 (July 1991)
  • The Story Of Electrical Energy; Pt.12 (August 1991)
  • The Story Of Electrical Energy; Pt.13 (September 1991)
  • The Story Of Electrical Energy; Pt.14 (October 1991)
  • The Story Of Electrical Energy; Pt.15 (November 1991)
  • The Story Of Electrical Energy; Pt.16 (December 1991)
  • The Story Of Electrical Energy; Pt.17 (January 1992)
  • The Story Of Electrical Energy; Pt.18 (March 1992)
  • The Story Of Electrical Energy; Pt.19 (August 1992)
  • The Story of Electrical Energy; Pt.20 (September 1992)
  • The Story Of Electrical Energy; Pt.21 (November 1992)
  • The Story Of Electrical Energy; Pt.22 (January 1993)
  • The Story of Electrical Energy (April 1993)
  • The Story Of Electrical Energy; Pt.24 (May 1993)
  • The Story Of Electrical Energy; Pt.24 (June 1993)
Items relevant to "Digital Sine/Square Wave Generator; Pt.2":
  • Digital Sine/Square Wave Generator PCB patterns [04108901/2] (Free)
  • Silicon Chip article scan, August 1990 - Digital Sine/Square Wave Generator; Pt.2 (AUD $10.00)
Articles in this series:
  • Digital Sine/Square Wave Generator; Pt.1 (July 1990)
  • Digital Sine/Square Wave Generator; Pt.2 (August 1990)
Articles in this series:
  • Computer Bits (May 1990)
  • Computer Bits (June 1990)
  • Computer Bits (July 1990)
  • Computer Bits (August 1990)
  • Computer Bits (September 1990)
Articles in this series:
  • Amateur Radio (November 1987)
  • Amateur Radio (December 1987)
  • Amateur Radio (February 1988)
  • Amateur Radio (March 1988)
  • Amateur Radio (April 1988)
  • Amateur Radio (May 1988)
  • Amateur Radio (June 1988)
  • Amateur Radio (July 1988)
  • Amateur Radio (August 1988)
  • Amateur Radio (September 1988)
  • Amateur Radio (October 1988)
  • Amateur Radio (November 1988)
  • Amateur Radio (December 1988)
  • Amateur Radio (January 1989)
  • Amateur Radio (April 1989)
  • Amateur Radio (May 1989)
  • Amateur Radio (June 1989)
  • Amateur Radio (July 1989)
  • Amateur Radio (August 1989)
  • Amateur Radio (September 1989)
  • Amateur Radio (October 1989)
  • Amateur Radio (November 1989)
  • Amateur Radio (December 1989)
  • Amateur Radio (February 1990)
  • Amateur Radio (March 1990)
  • Amateur Radio (April 1990)
  • Amateur Radio (May 1990)
  • Amateur Radio (June 1990)
  • Amateur Radio (July 1990)
  • The "Tube" vs. The Microchip (August 1990)
  • Amateur Radio (September 1990)
  • Amateur Radio (October 1990)
  • Amateur Radio (November 1990)
  • Amateur Radio (December 1990)
  • Amateur Radio (January 1991)
  • Amateur Radio (February 1991)
  • Amateur Radio (March 1991)
  • Amateur Radio (April 1991)
  • Amateur Radio (May 1991)
  • Amateur Radio (June 1991)
  • Amateur Radio (July 1991)
  • Amateur Radio (August 1991)
  • Amateur Radio (September 1991)
  • Amateur Radio (October 1991)
  • Amateur Radio (November 1991)
  • Amateur Radio (January 1992)
  • Amateur Radio (February 1992)
  • Amateur Radio (March 1992)
  • Amateur Radio (July 1992)
  • Amateur Radio (August 1992)
  • Amateur Radio (September 1992)
  • Amateur Radio (October 1992)
  • Amateur Radio (November 1992)
  • Amateur Radio (January 1993)
  • Amateur Radio (March 1993)
  • Amateur Radio (May 1993)
  • Amateur Radio (June 1993)
  • Amateur Radio (July 1993)
  • Amateur Radio (August 1993)
  • Amateur Radio (September 1993)
  • Amateur Radio (October 1993)
  • Amateur Radio (December 1993)
  • Amateur Radio (February 1994)
  • Amateur Radio (March 1994)
  • Amateur Radio (May 1994)
  • Amateur Radio (June 1994)
  • Amateur Radio (September 1994)
  • Amateur Radio (December 1994)
  • Amateur Radio (January 1995)
  • CB Radio Can Now Transmit Data (March 2001)
  • What's On Offer In "Walkie Talkies" (March 2001)
  • Stressless Wireless (October 2004)
  • “Degen” Synthesised HF Communications Receiver (January 2007)
  • WiNRADiO: Marrying A Radio Receiver To A PC (January 2007)
  • PICAXE-08M 433MHz Data Transceiver (October 2008)
  • Half-Duplex With HopeRF’s HM-TR UHF Transceivers (April 2009)
  • Dorji 433MHz Wireless Data Modules (January 2012)
Articles in this series:
  • Remote Control (October 1989)
  • Remote Control (November 1989)
  • Remote Control (December 1989)
  • Remote Control (January 1990)
  • Remote Control (February 1990)
  • Remote Control (March 1990)
  • Remote Control (April 1990)
  • Remote Control (May 1990)
  • Remote Control (June 1990)
  • Remote Control (August 1990)
  • Remote Control (September 1990)
  • Remote Control (October 1990)
  • Remote Control (November 1990)
  • Remote Control (December 1990)
  • Remote Control (April 1991)
  • Remote Control (July 1991)
  • Remote Control (August 1991)
  • Remote Control (October 1991)
  • Remote Control (April 1992)
  • Remote Control (April 1993)
  • Remote Control (November 1993)
  • Remote Control (December 1993)
  • Remote Control (January 1994)
  • Remote Control (June 1994)
  • Remote Control (January 1995)
  • Remote Control (April 1995)
  • Remote Control (May 1995)
  • Remote Control (July 1995)
  • Remote Control (November 1995)
  • Remote Control (December 1995)
Cash in your surplus gear. Advertise it here in Silicon Chip. CLASSIFIED ADVERTISING COUPON ANTIQUE RADIO Advertising rates for this page: Classified ads - $7.00 for up to 15 words plus 40 cents for each additional word; Display ads (casual rate) - $20 per column centimetre (max. 10cm). Closing date: five weeks prior to month of sale. If you use a PO Box number, you must include your permanent address and phone number for our files. We cannot accept ads submitted without this information. To run your own classified ad, put or.e word on each of the lines below and send this form with your payment to: Silicon Chip Classifieds , PO Box 139 , Collaroy Beach, NSW 2097. ANTIQUE RADIO RESTORATIONS. Your one-stop electronic repair shop. Specialising in restoring vintage radios including chassis rewiring , quality new parts, valves , valve sockets, speakers, transformers , cabinet restoration . Quality secondhand radio dials & parts for most brands & models. About 400 radios in stock for restoration & parts. Every restored wireless is covered by a 2-year warranty on parts & service. French polishing of timber cabinets available. Vintage car radios in valve & transistor types available for restoration. Repairs done on tape decks , amplifiers, TVs & videos. Open Sat. 1Oam-5pm; Sun . 12 .30-5pm. 109 Cann St, Bass Hill, NSW 2197. Phone (02) 645 3173 BH or (02) 726 1613 AH. PLEASE PRINT EACH WORD SEPARATELY, IN BLOCK LETTERS 2 3 4 5 6 7 8 9 10 11 12 13 14 15 ($7.00) 16 ($7.40) 17 ($7 80) 18 ($8.20) 19 ($860) 20 ($900) 21 ($9.40) 22 ($9.80) 23 ($1020) 24 ($10 60) 25 ($11 00) 26 ($11.40) 27 ($11.80) 28 ($12 20) 29 ($12.60) 30 ($13.00) 31 ($13.40) 32 ($13.80) 33 (14.20) 34 ($14.60) 35 ($15.00) 36 ($15.40) 37 ($15 .80) 38 ($16.20) 39 ($16.60) 40 ($17.00) 41 ($17.40) 42 ($17.80) 43 ($18.20) 44 ($18.60) 45 ($19.00) 46 ($19.40) 47 ($19 80) 48 ($20.20) 49 ($20.60) 50 ($21 00) 51 ($21 .40) 52 ($21.80) 53 ($22.20) 54 ($22.60) 55 ($23.00) 56 ($23.40) 57 ($23 .80) 58 ($24.20) 59 ($24.60) 60 ($25.00) Name. Street Postcode Suburb/Town Enclosed is my cneque or money order for $ ........... .. ..... .. .. ..... .. ...... or please debit my D Bankcard Card No lL D Visa Card D _ _ _ L _ L _ __ L ___L__ _ l _ - - - '- Signature .. MasterCard j _ _ _ L __ L_ _ _ L _L _ _i ___L__ _ L _ - - - ' _ _ J SILICON CHIP DIGIT AL WAVEFORM GENERATION: as described in SILICON CHIP in March , May, June & July 1990. PC board and software to generate waveforms. Both for only $39.95 including p&p. Instructions included. PC Board $16.00, Software $32.50 including postage . Send cheque or money order to M. Radvanyi, PO Box 49 , Kingswood , NSW, 2750. BELT KITS FOR VCRs. Please supply brand & model number & $1 2. 00 for each kit required. Prompt dispatch assured. James Cotterill, PO Box 44, Farrer, ACT 2607 . EPSON PB0 PORTABLE battery rechargeable 80-column printer. Serial interface. Very compact & light. 1 .1 kg. Uses normal or thermal paper. $1 7 5 . Import Technologies (07) 372 5138. TOSHIBA LCD SCREEN. Originally to suit T1500 desktop. 240 x 180mm, 640 x 200 pixels. Uses 5V supply & TTL drive signals. Suit experimenter. $150. Import Technologies (07) 372 5138. . Card expiry date ...... ./ .. .... . . FAX THIS COUPON WITH YOUR CREDIT CARD DETAILS TO (02) 969 6503 110 FOR SALE KITS AVAILABLE FOR the ETI Digi125 $17.95 plus $2 .50 p&p. Heatsink not supplied. Kits built and repaired. u, a., -~ ...0 ·01 0 C u ..c (.) (I) a., 00 ·s Cl) W IC of ._ :E w "5 oo :C IC o. -:C () (.) t- ~ a: a., (.) -~ a., Cl) SIMM MODULES 1 Mb X 9 0 ... ~ ·;: ..c '- 0 ~ 0 ~ >-0 ~ ..c ro SMARTWORK POST-PROCESSOR: if you own a HP? 4 75 or compatible flat bed plotter you can plot your own PCBs direct on blank board ready to etch. PP plots 1: 1 and mirror image. Only $99. PC Computers (08) 332 6513. GENERATOR, Model and square wave out1 MHz. Atennuator steps. As new. $260 969 2160 . WEATHER FAX programs for IBM XT/ATs * * * "RADFAX2" is a high resolution, shortwave weather fax, Morse & RTTY receiving program . Needs CGA, SSB HF radio & Radfax decoder . Also "RF2HERC", " RF2EGA" & " RF2VGA", same as RADFAX2 but suitable for Hercules, EGA & VGA cards respectively. $35. * * * "SATFAX" is a NOAA, Meteor & GMS weather satellite picture receiving program . Uses EGA & VGA modes, needs EGA or VGA colour monitor & card, plus "WEATHER FAX" PC card. $45. * * * All programs are on 5.25-inch or 3 .5-inch discs (state which) & include documentation . Add $3 postage . ONLY from M. Delahunty, 42 Villiers St, New Farm , Qld 4005. Phone (07) 358 2785 . UC3906 IC SOFTWARE: from the author of the SLA Battery Charger in SILICON CHIP , March 1990. Allows you to quickly design a charger for any SLA battery between 4V & 30V. Available on 5.25-inch 360K disc for IBM XT/AT (GWBASIC required), C64/C16, Apple II (FPBASIC required) with instructions. $19.95 each (please specify computer) . Only from D. Yates, PO Box 134, French's Forest, NSW 2086 . See SILICON CHIP, Jan. 1990 COMPLETE KIT ........... $59.00 BUILT & TESTED ..... .. $119 .00 CASE .. .... ........... .... .... $10.00 sons $10.50 DRAM 256K X 4 80ns $1 0.50 cO FUJITSU MEMORY CHIPS Prices at July 8th Speed CHIP TYPE 100ns sons ?Ons PRICE EX TAX SIMMS 9x256 9x1mb (MACS) 8x1 mb (IBM) 9x1 mb PS2 9x4mb" SIPPS 9x256 9x1mb DIP 411000 414256 41256 41464 (256) 4164 ZIP 414256 (1mb) 41256 411000 (1 mb) 440 0 (4mb/ 29.50 97. 00 31. 00 99.00 94. 00 36.00 115.00 99.00 650.oo· 31. 00 99.00 9.85 9.85 2.80 2.9 0 36.00 115.00 10.60 10.60 3.20 9.85 10.60 150.00 29.50 9.40 9.40 2.65 2.75 2.50 9.40 2.70 9.40 9.85 65.00 Sales Tax 20 1/,. Overnight delivery. Credit cards welcome Phone for pricing on 60ns, Toshiba , Compaq & Laser Printer PELHAM Tel (02) 427 0011 Fax (02) 418 6831 FIX-A-KIT $20 PER HOUR LABOUR NO CHARGE FOR KITS THAT CAN'T BE REPAIRED 3 MONTHS WARRANTY ON REPAIRS CONSTRUCTION AVAILABLE HYCAL INSTRUMENTS DESIGN, MANUFACTURE, REPAIR OF ELECTRONIC EQUIPMENT (02) 633 5897 JILOA (TECHNIKIT DIV.) ACTIVE SHORTWAVE ANTENNA DRAM 1 Mb X 1 PHONE : 02 481 0065 : 02 484 4460 FA X 3:. 6i. Repairs to radio control toys. Model railway projects designed and built. Prototype and production board supplier to the hobbyist. Supplier of PCBs for projects in SILICON CHIP. Electronic Toy Services (08) 382 8919. · $115.00 PACIFIC MICROELECTRONICS PTY. LTD. ' CENTRAL PARK" UNIT A20, 4 CENTRAL AVENUE, THORNLEIGH N.S.W. 2120 0 _g c son s • Add 20,c: Sales Tax / SS. 00 P & P .:,::_ (I) u, (.) ~::, 2C E en LEADER AUDIO LAG-120A. Sine put. 1 0Hz to -50dB in 1 0dB ono. Phone (02) of Computers the Quality you expect .. -t jjj ~ -a3 f- C - From Japans Largest Manufacturer C: 0 Ol C MEMORY IC' s & SIMM"s C'• Cl) LOOP ANTENNA KIT .. ... ..... ........ ... .. .. $44.00 FULLY BUILT ........ .. $69 .00 Improve signal strength & signal quality in a portable tunable antenna. BOX 73, GLENHUNTLY, VIC. 3163 (03) 571 6303 MY AUSTRALIAN DESIGNED low cost super fast Z80 micro-controller development system has gained acceptance already with educational institutions . Pop it on the end of any PC MSDOS or Z80 machine and away you go. Boards, EPROM and 360K disk $76 including postage for a short form kit. Gee , I wish I had this when I was a kid. For more info. send a 41 c stamp to: Don McKenzie, 29 Ellesmere Crescent, Tullamarine 3043. LOGIC ANALYSER. Gould Instruments K40 stand alone analyser. Eight nonvolatile memories, ?-inch CRT, 4 x 2K sample memories, 2 x 16-channel, probes up to 100MHz, asynchronous capture. Weighs 7.7kg . $975.00. Import Technologies (07) 372 5 138 . PROJECT PCBs: ETI-DIGI 1 25 audio amp $9/pair, ETl-1623 IBM PIA card AUGUST 1990 111 -~---------------------, FREEPOST SUBSCRIPTION COUPON To: Freepost 25, Silicon Chip Publications, PO Box 139 Collaroy Beach, NSW 2097, Australia. NO POST AGE ST AMP REQUIRED IN AUSTRALIA. □ Start in _ _ _ _ _ _ __ 0 Renewal New subscription Name _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __ (PLEASE PRINT) Street _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __ __ Suburb/town _ _ _ _ _ _ _ _ _ _ _ _ _ Postcode_ _ __ 1 year ( 1 2 issues) D $A42 Australia NZ & PNG (airmail) 0 Overseas surface mail D $A62 D $A 1 20 Overseas airmail 2 years (24 issues) D $A84 D $A130 D $A130 D $A240 $A65 Enclosed is my cheque/money order for $ _ _ _ _ or please debit my ~ Bankcard Card No. U Visa Card L_I-'--'------'-I__,I I D MasterCard I ]I I I~~~~ Signature _ _ _ _ _ _ _ _ _ _ _ Card expiry date _ __,___ L---------------------~-J ,k---------------------, SILICON CHIP BINDERS Yes 1 Please send me _ _ __ SILICON CHIP binder(s) at $A11.95 plus $ A3 p&p each (NZ p&p $A6) Name _ _ _ _ _ _ __ _ _ _ _ __ _ _ _ __ _ __ (P LE AS E PRI NT) Street _ ____ _ _ _ _ _ _ _ __ _ _ _ __ _ _ __ Suburb/town _ _ __ _ _ _ _ _ _ _ Postcode _ _ _ _ __ Enclosed is my cheque/money order for $ _ _ __ or please debit my Advertising Index Adroit Electronics .. .......... .. 111 Altronics ..... ..... ..... ... ...... 61-65 Arista .......... .... ... ...... ... ...... ... 5 Aust-Tek Electronics ........... . 8 1 Automatic Alarms ... ..... .... .... . 25 Back Issues .. ........ ..... 104 ,105 Board Solutions .... .. .... .... 7 3- 7 5 David Reid Electronics ...... IFC , 1 Dick Smith Electronics .... . 10-1 5 Electronic Solutions .... .. .. 86,87 Elmeasco .... .... ..... ......... 25 ,81 Force Electronics ...... .. .. ..... . 23 Geoff Wood Electronics ...... 1 03 Harbuch Electronics ... .......... 4 7 Hycal Instruments .. .... ..... ... 111 Jaycar Electronics ..... .... . 28-31 92 -95 Jiloa ... ... ... .. ......... ...... ... .... 111 J.V. Tuners ..... ..... ... ...... ... .. . 47 Oatley Electronics ... .. ..... ... .. 27 Pacific Microelectronics ...... 111 PC Marketplace .... .... ... .... .. . IBC Pelham ... ...... ...... .. ........... 111 Philips .. .... .... ... ... ... ... 35 ,37 ,39 Protel ... ...... ....... ... ..... ..... .... 79 RCS Radio . . . . . . . . . . . . . . . . . . . . . . . . . 91 Resurrection Radio ....... ...... ... 9 Rod Irving Electronics ..... 40, 4 1 44,45,98 ,99 Sheridan Electronics ...... ... ... 91 Silicon Chip Binders ..... 51,OBC Sound Australia ........ ............. 9 Subscriptions ......... ...... .... . 1 09 Tech-Fast .. ... ..... .... ....... ... ... 59 Westinghouse .. .. ....... ..... ..... 1 9 I I Bankcard I J Visa Card CJ MasterCard PC Boards Signature _ _ _ _ __ __ __ _ Card expiry date_~-- L _______________________ J $39 . 95 , 6502 / Z80 / 6809 miniprocessor $49 . PRE-BUil T AUDIO AMPS: 3 .5W LM380 $20, LM1875 $30, 150W IC-150 $99, 300W IC-300 $179, 60W Valve-1 $99, 200W Valve-2 $199, AudioToolkitTool-1 $69, FET-1 super quality stereo preamp $20, Bass & Treble $23. ROBOTICS: experimenter's kit. Includes IBM-PC controller, PSU, stepper motor, manual, software $99. 112 SILICON CHIP Digital voice recorder TMS-334 7 chips $25. PC Computers, 36 Regent St, Kensington, SA. Phone (08) 332 6513. TOSHIBA T3100 CO-PROCESSOR kit. This piggy-pack board enables the fitting of a 80287-8 to the early T3100 . Two types available, solder in & plug in. Solder version $190.00. Plug-in version $335.00. Import Technologies (07) 372 5138. Printed circuit boards for SILICON CHIP projects are made by: • Electronic Toy Services, 2/111 Glynville Drive, Hackham West, SA 5163. Phone (08) 382 8919 . • Jemal Products, 5 Forge St, Welshpool, WA 6106. Phone (09) 350 5555. • Marday Services, PO Box 19-189, Avondale, Auckland, NZ. Phone 88 5730. • RCS Radio Pty Ltd, 651 Forest Rd, Bexley, NSW 2207. Phone (02) 587 3491.