Silicon ChipMarket Centre - October 1992 SILICON CHIP
  1. Outer Front Cover
  2. Contents
  3. Publisher's Letter: Solar power will come into its own
  4. Feature: Manned Electric Flight Across The USA by Leo Simpson
  5. Project: A 2kW 24VDC To 240VAC Sinewave Inverter; Pt.1 by John Clarke
  6. Project: A Multi-Sector Home Burglar Alarm; Pt.2 by Mike Zenere
  7. Order Form
  8. Vintage Radio: Vintage radio repairs made easy by John Hill
  9. Serviceman's Log: Confession is good for the soul by The TV Serviceman
  10. Project: Build A Mini Amplifier For Personal Stereos by Darren Yates
  11. Project: The Thunderbird Battery Charger by Herman Nacinovich
  12. Review: The Philips PM3394 Digital/Analog Scope by Leo Simpson
  13. Feature: Amateur Radio by Garry Cratt, VK2YBX
  14. Feature: Remote Control by Bob Young
  15. Feature: Computer Bits by Bryon Miller
  16. Back Issues
  17. Market Centre
  18. Advertising Index
  19. Outer Back Cover

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

You can view 51 of the 104 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.

Items relevant to "A 2kW 24VDC To 240VAC Sinewave Inverter; Pt.1":
  • Silicon Chip article scan, February 1993 - 2kW 24V/240VAC Sinewave Inverter Pt 5 (AUD $10.00)
  • Silicon Chip article scan, January 1993 - 2kW 24V/240VAC Sinewave Inverter Pt 4 (AUD $10.00)
  • Silicon Chip article scan, December 1992 - 2kW 24V/240VAC Sinewave Inverter Pt 3 (AUD $10.00)
  • Silicon Chip article scan, November 1992 - 2kW 24V/240VAC Sinewave Inverter Pt 2 (AUD $10.00)
  • Silicon Chip article scan, October 1992 - 2kW 24V/240VAC Sinewave Inverter Pt 1 (AUD $10.00)
  • EEPROM table for the 2kW 24V DC to 240VAC Sinewave Inverter (Software, Free)
  • Transformer winding diagrams for the 2kW 24VDC to 240VAC Sinewave Inverter (Software, Free)
  • 2kW 24V DC to 240VAC Sinewave Inverter PCB patterns (PDF download) [11309921-4] (Free)
  • Silicon Chip article scan, October 1992 - 2kW 24V/240VAC Sinewave Inverter Pt 1 (AUD $10.00)
Articles in this series:
  • A 2kW 24VDC To 240VAC Sinewave Inverter; Pt.1 (October 1992)
  • A 2kW 24VDC To 240VAC Sinewave Inverter; Pt.2 (November 1992)
  • A 2kW 24VDC To 240VAC Sinewave Inverter; Pt.3 (December 1992)
  • A 2kW 24VDC To 240VAC Sinewave Inverter; Pt.4 (January 1993)
  • A 2kW 24VDC To 240VAC Sinewave Inverter; Pt.5 (February 1993)
Articles in this series:
  • A Multi-Sector Home Burglar Alarm; Pt.1 (September 1992)
  • A Multi-Sector Home Burglar Alarm; Pt.2 (October 1992)
Items relevant to "Build A Mini Amplifier For Personal Stereos":
  • Silicon Chip article scan, October 1992 - Mini Amplifier For Personal Stereos (AUD $10.00)
Items relevant to "The Thunderbird Battery Charger":
  • Silicon Chip article scan, October 1992 - The Thunderbird Battery Charger (AUD $10.00)
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 (August 1992)
  • Remote Control (September 1992)
  • Remote Control (October 1992)
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)
.......TCENTRE Cash in your surplus·gear. Advertise it here in Silicon Chip. sal. Please ring Mogens Hansen (03) 386 8357. 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 w ireless 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. Open Sat. 10am-5pm; Sun. 12.30-5pm. 109 Cann St, Bass Hill, NSW 2197. Phone (02) 645 3173 BH or (02) 726 1613AH. FOR SALE WEATHER FAX programs for IBM XT/ ATs *** "RADFAX2" $35 is a high resolution, shortwave fax, Morse & RTTY receiving program. Suitable for CGA, EGA, VGA and Hercules cards (state which). Needs SSB HF radio & Radfax decoder. *** "SATFAX" $45 is a NOAA, Meteor & GMS weather satellite picture receiving program. Needs EGA or VGA plus "WEATHER FAX" PC card. *** "MAXISAT" $75 is similar to SATFAX but needs 2Mb expanded memory (EMS 3.6 or 4.0) and 1024 x 768 SVGA card. All programs are on 5.25-inch or 3.5-inch disks (state which) & include documentation. Add $3 postage. Only from M. Delahunty, 42 Villiers St, New Farm, Old 4005. Phone (07) 358 2785. WANTED WANTED: Manual and disc for EPROM prog rammer - JMC Promac2 Univer- MS-DOS PC PRINTER port driven Z80 development system. Includes Fast Z80 Cross Assembler, Z8TBasic and lots of r-- -----------------------, CLASSIFIED ADVERTISING RATES Advertising rates for this page: Classified ads: $10.00 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 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. Enclosed is my cheque/money order for $_ _ _ _ or please debit my O Bankcard O Visa Card 0 Master Card I I I 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_ _ _ _ __ I L _____ ____________________ J Card No. 102 SILICON CHIP source code. Once only initial outlay for the short form kit $76. Additional CPU blank boards $35. For more information, send a 45c stamp to Don McKenzie, 29 Ellesmere Crescent, Tullamarine 3043. Phone (03) 338 6286. KIT REPAIRS: fixed price servicing for all kits, no job too small, only quality components used. Ph (02) 649 2134 after 5pm. SIMPLE IBM PC DATA ACQUISITION & control: C001 - plans & software for a 1-chip a-channel analog to digital converter that plugs into the printer port. Suitable for laptops or desktops, $25. • C002 - a small 15° per step, unipolar stepper motor plus plans for a 1-chip printer port interface & software source code showing how to drive the motor in wave, full-step & half-step modes, $25. • C003 - plans & software for a remote 4-button keypad . Uses the serial port, no external power required , $25. All prices include post & packing within Australia. To order, send cheque or money order to Lambda Systems, PO Box 259, Unanderra, NSW 2526, or send SSAE for more info. SECURITY ALARM COMPONENTS: commercial quality alarm panels, detectors, cable, everything for complete alarm system. DIY kits. Discounted prices. 4-core alarm cable $35 per 100m. 2-core alarm cable (figu re-8) $15 per 100m. PIA detectors pulse count $59 ea. Horn speakers $12.50 ea. Mail order service send SAE for free price list to Security Distributors, 141 Todds Rd, Lawnton, Old 4501 . Phone (07) 882,0002. SURPLUS COMPONENTS: 747CJ OIL ceramic $1 ea or 25 for $20; 150Q 1OW resistors $1 ea or 1o for $8; Bourns 3386 trim pots 5kQ or 10kQ, 50c ea or 10.for $4; Eska 3AG 10A ceramic fuse, packet of 10 $1.50; ex-computer EPROMs, erased and blank tested, 2732, 2764, 27128, $2 ea or 10 for $15; Valves, ex-government, new 12AT7 $8 ea, 5Y3GT $6 ea, KT66 $25 ea, 6AN8A $9 ea, 6BL8 $8 ea. Many other valves MEMORY EXPANSION PRICES AT SEPT 9TH, 1992 I SIMM 1Mb x 5 ?Ons 1Mb x 3 ?Ons 1Mbx8 100ns 4Mb x 9 sons 4Mb x 8 80ns (For SIP add $1.00) LOOKING FOR SEMI'S? We stock both Japanese & European types for TV , VCR and Audio applications. Translstors2SA 2SB 2SC 2SD 2SK BC BD MJ 2N etc. t:::; AN ~~~:1~f E:~~ ~M M 1 11 <~ MB STK TA TDA UPC UPD etc. ' i-d Phone or fax for a price list . Wagner Electronlc ServlcH Ply Ltd. 305 Liverpool Road Ashfield, NSW 2131 Ph: (02) 7118 9233 Fax: (02) 7118 001? DRAM DIP 1 x 1Mb ?Ons 256 x 4 ?Ons 41256 sons 1Mb x 4 (stat) $46 $42 $37 $164 $152 $5 $5 $2 $23 DRIVES SEAG 130Mb 19M SEAG 44Mb 28M C'NER 200/12 C'NER 80/19 $438 $260 $750 $335 IBM PS.2 50/55/70 2Mb 70/35 4Mb $115 $1130 TOSHIBA T3200SX 2Mb T44/6400 4Mb T5200 2Mb $135 $350 $135 MAC 16MbQUADRA 2MbSI & LC 4Mb P'Book $780 $83 $260 BOARDS $232 8Mb AT W2MB 8Mb PS2W2MB $234 4Mb HP Laser W2MB $155 8Mb PANAS W2MB $1 70 1Mb TIW1MB $80 Sales tax 20%. Overnight delivery. Credit cards welcome. Ring for Latest Prices Plans Kits and PCBs 1OOW Valve Amp PCB ........ $30 Valve Amp PSU PCB ..................... ........ .................. $25 Universal PSU (±5/±12V) Dual Supply .. ...... ............ $1 0 Digi 125 1OOW amp/pair ............... ........ .................. $1O ETI 1623 PIA for PCs .... .................... $40 Max 1/0 Board .. .. .. ... ................. .... .......... $40 Max Kit ............................................ ..................... $169 LM380 3.5 amp PCB ........... ................... $7 AEM 35W amp kit ...................................... ............. .. $20 ETI Audio Toolkit PCB .. ............ ..................... $10 AGC Amp PCB ............... ... ........ ......... $7 Z-80 Miniprocessor PCB ............................. $50 6502 Miniprocessor PCB ................. ......................... $50 6809 Miniprocessor PCB ...... ....... $50 8048/8049 Developers board complete B&T ......... $1 99 IBM PC Prototype PCB ······························· ............ $50 EPROM Programmer .............................................. $299 ESL-1 Electrostatic speaker kiVpair inc manual ...... $899 ESL-1 Assembly Manual ............................... $50 P.C. Computers (08) 332 6513 36 Regent St, Kensington SA. PELHAM Tel: (D2) 9BD 6988 Fax: (02) 980 6991 1st Floor, 100 Yarrara Rd, PO Box 382, Pennant Hills, NSW 2120. FIX-A-KIT KIT REPAIR & CONSTRUCTION and components available. Send SAE for list. Open Thursday, Friday 4pm8pm, Sat 9am-4pm. 143 Grays Rd, Enoggera Old . Ph (07) 355 1314 or (07) 855 1880 AH, Fax (07) 855 1014. Visa, Bankcard , Mastercard available for fax or phone orders over $20. Secontronics, PO Box 2215, Brookside Old 4053. HARD DRIVE: Maxtor voice coil IDEAT. Factory warranty. Great bargain. New 120Mb $560, 200Mb $860. Mail order welcome. Altec Pacific. BH (03) 800 2007. Fax (03) 800 3363. AH (03) 801 4391 Wantirna. FOR SALE: Oscilloscope, Thandar, low TRANSFORMER REWINDS 3 MONTHS WARRANTY ON REPAIRS 12 MONTHS WARRANTY ON CONSTRUCTION TECHNICAL ASSISTANCE ALL TYPES OF TRANSFORMER REWINDS HVCAL ELECTRONICS TRANSFORMER REWINDS Design. Manufacture & Repair of Electronic Equipment Reply Paid No.2, PO Box 438, Singleton, NSW 2330. Ph: (065) 76 1291 . Fax: (065) 76 1003. power lightweight portable, operates from disposable or rechargeable cells. Includes AC adaptor/cell charger, carry case and probe. 10MHz bandwidth, 10mV sensitivity per/div. As new $550. Tom (02) 630 1434AH. VISIBLE LASER DIODE BARGAIN: brand new 5mW 670nm laser diode, plus a collimating lens, plus a driver kit, (02) 633 5477 plus instructions. Special introductory price $85. * CRYSTAL OSCILLATOR MODULES: small 4-terminal metal encased crystal controlled oscillator modules similar to the ones used on computer cards, four frequencies: 1, 20, 10 & 50MHz, $7 ea or 5 for $25. * GAS LASER: a brand new 1mW visible red Helium-Neon laser tube (632.8nm) plus a 12V kit supply to power it. $11 0 for the LOCAL TRADES & SERVICES Transfonner Rewinds T.A. Mowles .- \II types or transformer rewinds. Printed circuit boards for the hobbyist. For senice & enquiries contact: (02) 4011393 Fax (02) 7741154 (065) 761291 Fax (065) 761003 (08) 3265590 Ian .J Truscott 's Electronic World EEM Electronics Silicon Chip To ad\'crtise your 1>roducts or scniccs, please call Sharon on Mail or credit card facilities Printed circuit hoard assemhl). switchmode power supplies repaired. Design work from start to finish. Ring an)timc 9am-9pm \lon-Sun. (03) 7233344 Fax (03) 4192808 (03) 401 1393 (02)9795644(018)285532 JV Tuners - Repairs • • • • Shorted Turns Tester High Voltage Probe Degaussing Wand Remote Control Tester For senice & repair work OCT0BER 1992 103 r-------------------------, SILICON CHIP BINDERS l These beautifully-made binders will protect your copies of SILICON CHIP. They feature heavy-board covers and are made from a distinctive 2tone green vinyl that will look great on your bookshelf. * High quality. * Hold up to 14 issues * 80mm internal width. * SILICON CHIP logo printed in goldcoloured lettering on spine & cover. 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 o Bankcard Card No. O Visa Card O Master Card ~~II~~~I I'--'--'--~I I'--'--'--~ Signature_ _ _ _ _ _ _ _ _ _ _ Card expiry date_ _~/_ __ Name _ _ _ _ _ _ _ _ _ __ _ _ _ _ _ _ _ __ _ __ Street _ _ _ _ _ _ _ _ _ _ __ __ _ _ _ _ _ _ _ __ Suburb/town _ __ _ __ _ __ _ _ Postcode._ _ __ __ SILICON CHIP PUBLICATIONS PO Box 139, Collaroy Beach, NSW 2097, Australia. Phone (02) 979 5644 Fax: (02) 979 6503. L _________________________ J pair. * SWITCHED MODE POWER SUPPLIES: compact enclosed exTelecom supplies. Dimensions 300 x 90 x 180mm. Unregulated input 3050V, regulated output of 12V <at> 6A or 12V<at> 8A or 5V<at> 40A. Three different units. Limited stocks<at> $28 ea. P+P $7 (heavy!). Specify type when ordering (item No. 0145) . * STEREO HEADPHONES: similar to ones used for stereo "Walkmans". Clearance<at> $2 a pair. * TV ANTENNA: dual telescopic TV antenna similar to ones used on many portable TVs. Clearance <at> $3 ea. * KIT SPECIAL - ELECTRONIC -KEY: use it to activate door strikers for entering buildings, car alarms, central locking - the most secure key ever (see EA July 92). Two keys and one decoder kit for a total of $49.90. Major cards accepted with phone and fax orders. 104 SILICON CHIP Certified p&p Australia $5, NZ (airmail) $10. Oatley Electronics, PO Box 89, Oatley, NSW 2223. Phone (02) 579 4985. Fax: (02) 570 7910. Advertising Index Active Media Images ............... 101 Altronics ............. .... ............... 80-82 Antique Radio Restorations ..... 102 A-One Electronics ................ 62-63 Breakthrough Computers ....... ... 67 David Reid Electronics .. .. .... ...... .. 3 Dick Smith Electronics .......... 52-55 Economic Electronics ................ 76 EEM Electronics .... .......... .. .... .. 103 Electronic Toy services ..... ... .. .. 103 Electronic World ................. 45,103 Emona Instruments ...... ... .. ........ 51 Geoff Wood Electronics ....... .. .. .. .. 7 Hewlett Packard .... .. ...... ... ....... IFC Hycal Instruments ............... 77,103 Jayear Electronics .. ... 33-36,69-72 JV Tuners ......... .... ......... ... ....... 103 KT Technology ......................... IBC Macservice .......... ... ................... 40 M.E. Technologies .. ................... 95 Oatley Electronics ..... ... ...... 47,103 PC Computers ... ...................... 103 Pelham .................................... 103 Peter C. Lacey Services ... ..... .... 42 Philips Test & Measurement ...... 21 Old Exhibition Services ........... 101 RCS Radio .. ... ... .... .................. 104 Reserve Electronics .... ... ... ...... 101 Resurrection Radio ............... ..... 41 Rod Irving Electronics .......... 10-15 Sanyo Australia .................... 28-29 Scan Audio ......... .... ...... ............. 91 Silicon Chip Binders .... .. ..... 89,104 St Lucia Electronics ............. .. .... 85 Tecnico Electronics ................ OBC Tencom 92 .... ............................. 86 Tees Electronics & Computers .... 5 Tektronix ... ................................. 27 Transformer Rewinds ...... .... .... 103 Wagner Electronic Services .... 103 RC§ RADilO PTY LTD ~i~1,~ :::=i ' °ifl!....o I Ill [!OI RCS Radio Pty Ltd is the only company that manufactures and sells every PC board and front panel published in SILICON CHIP, ETI and EA. RCS Radio Pty Ltd, 651 Forest Rd, Bexley 2207. Phone (02) 587 3491 PC Boards Printed circuit boards for SILICON CHI_P projects are made by: • 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 .