Silicon ChipMarket Centre - February 1992 SILICON CHIP
  1. Outer Front Cover
  2. Contents
  3. Publisher's Letter: Service with a smile is truly a pleasure
  4. Feature: The Mobile Telephone Revolution by Garry Cratt & Greg Swain
  5. Vintage Radio: Console receivers from the 1930s by John Hill
  6. Project: Compact Digital Voice Recorder by Leo Simpson
  7. Project: Build A Stereo Power Amplifier by Leo Simpson & Bob Flynn
  8. Project: 12VDC/240VAC 40-Watt Inverter by John Clarke
  9. Feature: Computer Bits by Jennifer Bonnitcha
  10. Serviceman's Log: Some sets go on forever by The TV Serviceman
  11. Feature: Designing A Speed Controller For Electric Models by Bob Young
  12. Feature: Amateur Radio by Garry Cratt, VK2YBX
  13. Project: Adjustable 0-45V 8A Power Supply, Pt.2 by John Clarke
  14. Back Issues
  15. Order Form
  16. Market Centre
  17. Advertising Index
  18. Outer Back Cover

This is only a preview of the February 1992 issue of Silicon Chip.

You can view 45 of the 96 pages in the full issue, including the advertisments.

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Items relevant to "Build A Stereo Power Amplifier":
  • Silicon Chip article scan, February 1992 - Plastic Power Twin 50W Amplifier (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:
  • Remote Control (December 1991)
  • Remote Control (January 1992)
  • Designing A Speed Controller For Electric Models (February 1992)
  • Remote Control (March 1992)
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:
  • Adjustable 0-45V 8A Power Supply, Pt.1 (January 1992)
  • Adjustable 0-45V 8A Power Supply, Pt.2 (February 1992)
MARKET CENTRE Cash in your surplus gear. Advertise it here in Silicon Chip. r------------- ------------, CLASSIFIED ADVERTISING RATES 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. To run your classified ad, print it clearly on the lines below or on a separate sheet of paper & send it 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. 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. 10am-5pm; Sun. 12.30-5pm. 109 Cann St, Bass Hill, NSW 2197. Phone (02) 645 3173 BH or (02) 726 1613 AH. FOR SALE Enclosed is my cheque/money order for $._ _ __ O Bankcard O Visa Card or please debit my O Master Card I I I I I I i I I I Signature_ _ _ _ _ _ _ _ _ _ _ _ Card expiry date.___ /_ __ I I Name _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __ I I Street _ _ _ _ _ _ _ __ _ _ _ _ _ _ _ _ _ _ _ _ _ __ I I Suburb/town _ _ _ _ _ _ _ _ _ _ _ _ Postcode._ _ _ __ _ L _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ JI Card No. 94 L______L__~I .___I~~I L_Ij_______J____L__JI .___I~~ SILICON CHIP WEATHER FAX programs for IBM XT/ ATs *** "RADFAX2" $35 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" $45 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 5.25inch 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. KIT REPAIRS Kits repaired from all magazines. Switchmode power supplies repaired, design work from start to finish computer software consultancy. Ring anytime 9am-9pm Mon-Sun. EEM Electronics, 10 Bouverie Place, Epping, Vic. 3076 Phone (03) 401 1393 Direct CAD PCB design From your schematic, rough PCB,to ink plot negat i ve for prototype or one-off in s i ng I e or daub I e s i ded w i th s ii k screens & so I der resist. NC and photoplot options avai I able on Floppies. r Prices at December 1, 1991 SIMM 1MB x 9 1MBx8 4MB x 9 256 X 9 (For SIP Phone (02)807 6916 O or wr I te 0 ( ~ .C ~ G. F . & M. Hughes ~ PO Box 37, Ryde PCB ART NSW, 2112 1 J~ SATELLITE DISH ANTENNA: Videosat 2.1-metre, AZ/EL, Gold Band LNC, 60metre cable. 1.8-metre free-standing mount. Complete unit ready to go. Used once. Under cost $1500. Lawson Radio, 298 Great Western Highway, Lawson , NSW. Phone (047) 59 1254. COMPONENTS SPECIALS available until end April 1992. MC14433 digital panel meter chip $15.00 (new stock). MC45512 memorytelephonediallerchip $10.00. 4001, 4011 , 4071 , 4081 $0.40 ea for 1O up. 4013, 4017, 4024, 4040 $0.80 ea in lots of 10 up. 7805, 7808, 78L05, 78L08 $0.40 ea. 1N914 $0.05 ea, 1N4004 $0.07 ea. 2114 static RAM chips $1.50 ea, data available. P&P on components $4.00 up to order value of $200.00. Ring for postage rates on higher order values. CTOAN Electronics, PO Box 33, Condell Park, NSW 2200. Phone (02) 708 3763. DIGITAL SPEEDO kit $50.00. Digital tacho with 10RPM resolution $49.00. Memory telephone dialler with single button dialling $30.00. 40kHz crystals $12.00. Hall effect sensors $4.00. Certified P&P $5.00. CTOAN Electronics, PO Box 33, Condell Park, NSW 2200. Phone (02) 708 3763. $115 OFF THE WOR LD'S FIRST MSDOS Pocket PC. Australia's best price on Atari Portfolio $380 incl. tax, postage and insurance. 80C88 CPU, video cassette size. Lowest prices on accessories. For more info, send a 43c stamp to: Don McKenzie, 29 Ellesmere Crescent, Tullamarine 3043 CHEAPEST LASER EVER? We have a good supply of some new & near new laser heads with minor beam geometry problems. They produce outputs from 1-2mW. We can provide our universal 12V laser power supply kit & one of "' MEMORY EXPANSION 100ns 80ns 100ns 80ns sons sons add $1) DRAM-DIP 1MB x 1 sons 256 X 4 100ns sons 41256 120ns 100ns sons 55.00 57.00 48.00 53.00 225.00 16.00 6.40 6.30 6.50 1.80 2.00 2.20 COPROCESSORS 80387-DX 25 80387-SX 16 80287 10MHz 80287 To 20 173.00 142.00 95.00 156.00 FLOPPY DRIVES 3.5 Panasonic 1.44 3.5 Teac 1.44 5.25 Panasonic 1.2 80.00 86.00 92.00 EXPANSION CARDS LS 866N 32Mb OK 240.00 AST RAM plus 8Mb 350.00 BOCA AT plus 8Mb 250.00 PELHAM Tel (02) 980 6988 SPECIALS Sun SLC Sharp 6220 Sharp 8081 PS/2(ALL) PS/2(ALL) Mac FX/NIX Laser Printers 4Mb 1Mb 1Mb 2Mb 4Mb 4Mb 2Mb 250.00 160.00 100.00 150.00 295.00 230.00 206.00 SOCKETS Simm Sockets 30 x 1 Vert Simm Sockets 30 x 2 Ang Simm Sockets 30 x 2 Vert 1.70 3.50 3.20 Sales Tax 20%. Overnight Delivery. Credit Cards Welcome 1 st Floor, 100 Yarrara Road, Pennant Hills, NSW 2120. \.. DIGI-CART DSP BOARD For 16-bit IBM compatibles. Broadcast quality 44.1 kHz/16-bit stereo audio with audio recorder software. $1 599 + tax Custom software service for applications available. PC Computers (08) 332 6513 36 Regent St, Kensington SA. these heads for only $89. Oatley Electronics, PO Box 89, Oatley, .NSW 2223. Phone (02) 579 4985. Fax (02) 570 7910 BARGAIN PRICED LASER! A bigger laser! This SPECIALLY priced LASER KIT includes a brand new LARGE 3-5mW HE-NE LASER tube and a high quality potted 12V laser power supply to suit. Use them for effects, surveying, holography, healing, etc. Definitely not for kids! - laser light and high voltage dangers. The price is an incredible $199 for the tube and a power supply. Certified p&pAustralia $6; NZ (airmail) $10. Major credit cards accepted with phone & Fax (02) 980 6991 ~ FIX-A-KIT KIT REPAIR & CONSTRUCTION 3 MONTHS WARRANTY ON REPAIRS 12 MONTHS WARRANTY ON CONSTRUCTION TECHNICAL ASSISTANCE HYCAL ELECTRONICS Design, Manufacture & Repair of Electronic Equipment · (02) 633 5477 TRANSFORMER REWI NDS ALL TYPES OF TRANSFORMER REWINDS TRANSFORMER REWINDS Reply Paid No.2, PO Box 438, Singleton, NSW 2330. Ph: (065) 76 1291. Fax: (065) 76 1003. fax orders. Oatley Electronics, PO Box 89, Oatley, NSW 2223. Phone (02) 579 4985. Fax (02) 570 7910 LCD DISPLAY MODULES: high quality LCD display modules with LSI driver circuitry included , at a small fraction of their real prices: 24-character x 2-line display (24 x 2) - $24; 16 x 2 display - WANTED: YOUR CIRCUIT & DESIGN IDEAS Do you have a good circuit idea languishing in the ol' brain cells? If so, why not sketch it out, write a brief description & send it to us Provided your idea is workable & original, we'll publish it in Circuit Notebook & you'll make some money. You'll also help save us from the dreadful "circuit burnout" syndrome which afflicts anyone who has to generate too many circuit ideas in too short a time. We'll pay up to $60 for a really good circuit (not too big please). So transfer your circuit to paper & send it to Silicon Chip Publications, PO Box 139, Collaroy Beach, NSW 2097. FEB RUARY 1992 95 r----- -- -----------------, X SILICON CHIP BINDERS Protect your valuable issues with a special binder from SILICON CHIP. Our binders feature heavy board covers, are made from a distinctive two-tone green vinyl, and have the SILICON CHIP logo printed in gold-coloured lettering on the spine and front cover. They hold up to 14 issues and will look great on your bookshelf. Price: $A 11.95 + $A3 p&p or buy a subscription and get a discount on the first binder (see the subscription order form in this issue).To order, simply fill in & mail this coupon or phone orfaxyourorderto Silicon Chip Publications. Yes! Please send me _ _ _ SILICON CHIP binder(s) at $A11.95 plus $A3 p&p each (NZ $A6 p&p). Enclosed is my cheque/money order for $._ _ _ __ or please debit my D Bankcard Card No. O Visa Card O Master Card L_____L__~I '--1~____,I '--1~ ____,I ~I~____, Signature_ _ __ _ _ _ _ __ _ _ Card expiry date_ _~/_ __ Name _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __ Street _ _ __ _ _ _ __ _ _ _ _ _ _ _ _ _ _ __ _ __ SILICON CHIP PUBLICATIONS PO Box 139, Collaroy Beach, NSW 2097, Australia. Fax: (02) 979 6503. L _________________________ J $16; 16 x 2 display with backlighting $22.50. All modules are supplied with information and we have a backlighting inverter kit available: $9. Oatley Electronics, PO Box 89, Oatley, NSW 2223. Phone (02) 579 4985. Fax (02) 570 7910 PCVOICE RECORDER SOFTWARE: turn your computer into an audio recorder, $25 + $3pp {VGA/EGA/CGA/ MONO). MS-DOS required. Also available: PC TALKING VOLTMETER software. For project published in SILICON CHIP, Oct/Nov 1991. Plugs into the printer port of any IBM PC/XT/AT/386 or compatible. Displays voltages up to ±128V on screen, takes voltage samples over time, has 8-bit accuracy to within 1%. Combines with the PCVOICE RECORDER project to give a talking voltmeter. Available on 5¼-inch 360Kb disc plus documentation and instructions for $30 plus $3pp. Send your cheque or money order to Darren Yates, PO Box 134, French's Forest, NSW 2086. 96 SILICON CHIP Altronics .. ........ ..................... 48-49 Antique Radio Restorations .... .. 94 Av-Comm ...................... ..... ... .... 70 David Reid Electronics .. .............. 3 Dick Smith Electronics .... ..... 15-17 EEM Electronics .......... .. ........... 94 Electronic Components Shop ... 55 Electronic World .. .. .................... 53 Emona Instruments .. .. ... ............ 61 Geoff Wood Electronics ............ 83 G. F. & M. Hughes .... ..... .. .......... 95 Harbuch Electronics ... ... ............ 59 Hycal Instruments ..................... 95 Jaycar Electronics ...... 29-32,65-68 J.V. Tuners ............... ................. 59 Mark One Communications ... ..... 9 Oatley Electronics ................ 91,95 Patex Systems .......................... 63 PC Computers .......... .. ...... ...... .. 95 PC Marketplace ....... ............. 41,81 Pelham ............... ....... ... ... .. 95,0BC Peter C. Lacey Services .... .. .. ... 59 Philips .. .. ...... .. ... .... .. .... ............ IBC Preston Electronics ......... ....... ... 54 Protel Technology .. .... ..... .. ........ 60 RCS Radio .... ... ........... .. ........ .. .. 55 Suburb/town _ _ __ _ _ _ _ _ _ _ _ Postcode_ _ _ _ __ Phone (02) 979 5644 Advertising Index Resurrection Radio .... .. ..... ... ..... 21 Rod Irving Electronics .. .... .... 22,23 .................................. . 74,75,86,87 Forty pages of dreams! z CD ~ Scan Audio .. .... .... ... ......... .. ...... . IFC Stewart Electronics .. .... .... .. ....... 96 St Lucia .. ... .. .. .. .. ... .. .. .. .. .. .. .. .. 11 ,14 Transformer Rewinds ................ 95 Yokogawa ............... ........... ..... ... .. 5 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) 356 5555. • Marday Services, PO Box 19-189, Avondale , Auckland, NZ. Phone 88 5730. Name: Address: ......... .. ...... .. .. ................ ...... . Call sign: .. ......... Post Code: ... Stewart Electronic Components P.O. Box 281 Oakleigfi 3166 phone (03)543-3733 fax (03)543-7238 P/L • RCS Radio Pty Ltd, 651 Forest Rd, Bexley, NSW 2207. Phone (02) 587 3491 .