Silicon ChipMarket Centre - May 1991 SILICON CHIP
  1. Outer Front Cover
  2. Contents
  3. Publisher's Letter: The Electronic Service Industry Advisory Code of Practice
  4. Feature: How To Install Multiple TV Outlets by Jim Lawler
  5. Feature: Motors For Electric Vehicles by Gerry Nolan
  6. Order Form
  7. Vintage Radio: All about regenerative receivers by John Hill
  8. Project: Stereo Audio Expander by Darren Yates
  9. Project: Build A DTMF Decoder by Darren Yates & Greig Sheridan
  10. Project: Fluorescent Light Simulator For Model Railways by Darren Yates
  11. Project: 13.5V 25A Power Supply For Transceivers, Pt.1 by John Clarke & Leo Simpson
  12. Serviceman's Log: I was only a little bit careless by The TV Serviceman
  13. Feature: Computer Bits by Jennifer Bonnitcha
  14. Feature: Amateur Radio by Garry Cratt, VK2YBX
  15. Feature: The Story Of Electrical Energy; Pt.10 by Bryan Maher
  16. Back Issues
  17. Market Centre
  18. Advertising Index
  19. Outer Back Cover

This is only a preview of the May 1991 issue of Silicon Chip.

You can view 41 of the 96 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:
  • How To Install Multiple TV Outlets (May 1991)
  • How To Install Mutiple TV Outlets; Pt.2 (July 1991)
Articles in this series:
  • Electric Vehicles: The State Of The Art (January 1991)
  • Electric Vehicles; Pt.2 (February 1991)
  • Electric Vehicles; Pt.3 (March 1991)
  • The World Solar Challenge (April 1991)
  • Motors For Electric Vehicles (May 1991)
  • Electric Vehicle Transmission Options (June 1991)
Articles in this series:
  • All about regenerative receivers (May 1991)
  • Restoring a 4-valve Howard receiver (June 1991)
Items relevant to "13.5V 25A Power Supply For Transceivers, Pt.1":
  • Silicon Chip article scan, May 1991 - 13.5V 25A Power Supply For Amateur Transceivers Pt.1 (AUD $10.00)
Articles in this series:
  • Computer Bits (July 1989)
  • Computer Bits (August 1989)
  • Computer Bits (September 1989)
  • Computer Bits (October 1989)
  • Computer Bits (November 1989)
  • Computer Bits (January 1990)
  • Computer Bits (April 1990)
  • Computer Bits (October 1990)
  • Computer Bits (November 1990)
  • Computer Bits (December 1990)
  • Computer Bits (January 1991)
  • Computer Bits (February 1991)
  • Computer Bits (March 1991)
  • Computer Bits (April 1991)
  • Computer Bits (May 1991)
  • Computer Bits (June 1991)
  • Computer Bits (July 1991)
  • Computer Bits (August 1991)
  • Computer Bits (September 1991)
  • Computer Bits (October 1991)
  • Computer Bits (November 1991)
  • Computer Bits (December 1991)
  • Computer Bits (January 1992)
  • Computer Bits (February 1992)
  • Computer Bits (March 1992)
  • Computer Bits (May 1992)
  • Computer Bits (June 1992)
  • Computer Bits (July 1992)
  • Computer Bits (September 1992)
  • Computer Bits (October 1992)
  • Computer Bits (November 1992)
  • Computer Bits (December 1992)
  • Computer Bits (February 1993)
  • Computer Bits (April 1993)
  • Computer Bits (May 1993)
  • Computer Bits (June 1993)
  • Computer Bits (October 1993)
  • Computer Bits (March 1994)
  • Computer Bits (May 1994)
  • Computer Bits (June 1994)
  • Computer Bits (July 1994)
  • Computer Bits (October 1994)
  • Computer Bits (November 1994)
  • Computer Bits (December 1994)
  • Computer Bits (January 1995)
  • Computer Bits (February 1995)
  • Computer Bits (March 1995)
  • Computer Bits (April 1995)
  • CMOS Memory Settings - What To Do When The Battery Goes Flat (May 1995)
  • Computer Bits (July 1995)
  • Computer Bits (September 1995)
  • Computer Bits: Connecting To The Internet With WIndows 95 (October 1995)
  • Computer Bits (December 1995)
  • Computer Bits (January 1996)
  • Computer Bits (February 1996)
  • Computer Bits (March 1996)
  • Computer Bits (May 1996)
  • Computer Bits (June 1996)
  • Computer Bits (July 1996)
  • Computer Bits (August 1996)
  • Computer Bits (January 1997)
  • Computer Bits (April 1997)
  • Windows 95: The Hardware That's Required (May 1997)
  • Turning Up Your Hard Disc Drive (June 1997)
  • Computer Bits (July 1997)
  • Computer Bits: The Ins & Outs Of Sound Cards (August 1997)
  • Computer Bits (September 1997)
  • Computer Bits (October 1997)
  • Computer Bits (November 1997)
  • Computer Bits (April 1998)
  • Computer Bits (June 1998)
  • Computer Bits (July 1998)
  • Computer Bits (November 1998)
  • Computer Bits (December 1998)
  • Control Your World Using Linux (July 2011)
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:
  • 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)
MARKET CENTRE Cash in your surplus gear. Advertise it here in Silicon Chip. FOR SALE 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 & r-------------------------, I I I I I I I I I I 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, 4004 Old. Phone (07) 358 2785. LAB LASERS. 0.5mW to 2mW HeNe lasers complete . Ideal for students or hobbyists. Australian made. $440- $640. Phone M.C.E. L:isers (03) 357 0055. CLASSIFIED ADVERTISING RATES 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 classified ad, print clearly on the lines below or on a separate sheet of paper & send the form together with your cheque or credit card details to : Silicon Chip Classifieds, PO Box 139, Collaroy Beach , NSW 2097. Or fax the details to (02) 979 6503. THE WORLD'S FIRST MS-DOS pocket PC at Australia's lowest price. Atari Portfolio $480 inc tax. Post & insurance free for mail orders. All accessories available at reduced prices. Uses an 80C88 CPU & is video cassette size. Data transfer to XT/AT via optional serial or parallel interface. For more information, send a 43c stamp to: Don McKenzie, 29 Ellesmere Crescent, Tullamarine 3043 . DIGITAL WAVEFORMS from a PC. As described in SILICON CHIP in March, May & June 1990. The software can also be used for the similar project (Simple PC Function Generator) described in Electronics Australia in January 1989. Software & PC Board: $39.95 incl. p&p. Software only: $32.50 incl. p&p. Money order or cheque. M. Radvanyi, PO Box 49, Kingswood, NSW 2749. Enclosed is my cheque/money order for $_ _ _ _ or please debit my O Bankcard o Visa Card 0 Master Card ? I I Signature_ _ __ _ _ _ _ _ _ _ Card expiry date___/_ __ I I Name _ _ _ _ __ _ _ _ _ _ __ _ __ _ _ _ _ _ _ __ I I Street _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __ I I Suburb/town _ _ _ _ _ _ _ _ ___,_ _ Postcode_ _ _ _ __ I L _________________________ J Card No. IBM SOFTWARE: "Morse Tutor" $9. 5.25-inch or 3.5-inch (please specify) or call for price list. Disk Emporium, PO Box 780, Baulkham Hills 2153. Phone (02) 639 0615. CIRCUIT DESIGN SOFTWARE. Design your own .008% THD Sinewave Generator from 90Hz-30kHz using the PCB in SILICON CHIP, February 1991 . $20 inc. p&p. Design & build you own Audio Power Amplifier up to 20W. On-screen circuit diagram and hardcopy facilities. Instructions included. $30 inc. p&p. Custom-make your own SLA Battery Charger using the UC3906 IC (4-30V). Designed by the author of the SILICON MAY1991 95 MEMORY EXPANSION Advertising Index Altronics .. ... .......... .......... .. ..... 68-69 IIT 4164 41256 41464 411000 2.20 2.10 2.35 2.20 2.50 7.00 1MB x 4 (Static 256K X 9 1MB x 9 4MB 20.50 65.00 x9 120.00 8087 175.00 8087-1 175.00 8087-2 2.30 2.40 272.00 80287-8 2.75 802-87-10 275.00 178.00 287XLT 285.00 7.60 7.90 285.00 287XL 46 .00 387DX20 550.00 510.00 480.00 21.00 22.50 387DX25 693.00 640.00 600.00 76.00 81 .00 848.00 780.00 670.00 387DX33 387SX16 432.00 406.00 395.00 46.00 387SX20 510.00 440.00 Sales Tax 20%. Overnight Delivery. Credit Cards Welcome 1st Floor, 100 Yarrara Road, Pennant Hills, N.S.W. 2120 PELHAM Tel(02)980-6988 Fax(02)980-6991 Antique Radio Restorations ...... . 96 Arista ...... ......... .. .............. 44,55,77 Av-Comm ....... .. ... .. .... ....... 16,54,80 Back Issues .. .... ....... , ............ 90,91 David Reid Electronics ...... .. . 34,35 Electronic Solutions .... .. .... .... 22,23 Electronic Toy Services ............. 96 Elmeasco ............................. .... IFC Geoff Wood Electronics ............... 3 Harbuch Electronics .... .... ..... 54,80 Hycal Instruments ........ .. ......... .. . 96 MODEL TRAIN CONTROLLER project, SILICON CHIP, November 1990, $19.95 plus $2.50 p&p. Plugpack, 12VAC, 1. 7A, suitable for the above (use rectifier), $29.95 plus $4.00 p&p. Kits built & repaired. Prototype production board supplier to the hobbyist & supplier of SILICON CHIP project PCBs. ETS, PO BOX 491, NOARLUNGA CENTRE, SA 5168. Phone: (08) 382 8919 FIX-A-KIT Jaycar Electronics ... .. ........... 45-52 $20.00 PER HOUR LABOUR J.V. Tuners ................................. 73 3 MONTHS WARRANTY ON REPAIRS 12 MONTHS WARRANTY ON CONSTRUCTION Service to most types of electronic equipment M. Radvanyi .... .......... .. .. ..... .. ..... 95 TECHNICAL ASSISTANCE HVCAL ELECTRONICS Design, Manufacture & Repair of Electronic Equipment Oatley Electronics .................... . 29 PC Computers .. .... .. .... ...... ......... 96 Trading Hours 8am to 3pm, Monday to Friday PC Marketplace .. .:... .... .............. 41 (02) 633 5897 Pelham .. .... .. ...... .. .. .................... 96 Philips Test & Measurement .. OBC TRANSFORMER REWINDS Raytec Data Systems ................ 16 MAX 1/0 Board Kit $149.00 Built & Tested $269.00 ALL TYPES OF TRANSFORMER REWINDS RCS Radio ....... .. .. ..... ......... .. ..... 81 • 7 x Relays SPST 2 amps each • 8 x Switch inputs (TTL) • 1 x DAG (Digital to Analog converter) • 1 x ADC ( Analog to Digital converter) • 4 x Motor Drive outputs (40mA ea.) • 1 x Programmable timer output. MAX includes a 20-page manual with all schematics, parts layout etc., a 360K PC-compatible floppy with diagnostic and sample software in GW-Basic. MAX runs from a PC compatible printe r port for full compatibility with a large range of computers. Same day dispatch of orders. Credit cards or personal cheques we lcome. Reply Paid No. 2 PO Box 438, Singleton, NSW 2330. Ph:(065) 761291 Fax: (065) 761003 Phone (08) 332 6513 or Fax (08) 364 0902 (24 hours) PC Computers, 36 Regent St, Kensington, SA CHIP March 1990 project. $20 inc. p&p. Buy all three for $50 and save $20! IBM/XT/AT compatible, 5.25-inch 360K disc only, CGNEGNVGA, MS-DOS 3.2 or later. Send cheque/money order to: D. Yates, PO Box 134, French's Forest, NSW 2086 . SIGNAL GENERATOR, HP-606, 50kHz-65MHz, $320. Signal generator, HP-608D, 10-420MHz, $320. Sweep generator, Jerrold 900C, 500kHz-1200MHz, $380. SSS adapter, RA 121, $75. Cable fault locator, Bicco Test T215 (Cossor), $240. Logic analyser, HP1610, $860. D. Dauner Elec- 96 5ILICON CHIP TRANSFORMER REWINDS tronics, 51 Georges Crescent, Georges Hall, NSW 2198. Phone (02) 724 6982. Fax (02) 725 7850. Resurrection Radio .................... 21 Rod Irving Electronics ........ ...... 8,9 56,57,88,89 Sheridan Electronics .. ........ ... .... 78 Silicon Chip Binders ........... ..... IBC Subscriptions .. ........ .. .. .......... .. ... 17 ANTIQUE RADIO ANTIQUE RADIO restorations. Your one-stop radio repair shop. Specialising in restoring vintage radios including chassis rewiring, re-condensing, quality new parts, valves, valve sockets, speakers, power & audio transformers. Secondhand radio dials & parts for most brands & models. About 400 radios in stock for sale, restoration & parts. Every restored wireless is covered by a 2year warranty on parts & labour. We restore damaged woodwork & cabinets & French polish (approx. 40 coats) . Vintage car radios available for sale or restoration. Repairs done on tape decks & amplifiers. 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. SC Transformer Rewinds ................ 96 PC Boards 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.