Silicon ChipMarket Centre - November 1992 SILICON CHIP
  1. Outer Front Cover
  2. Contents
  3. Publisher's Letter: Light pollution wastes energy
  4. Project: Build An FM Radio Receiver by Darren Yates
  5. Project: A 2kW 24VDC To 240VAC Sinewave Inverter; Pt.2 by John Clarke
  6. Project: The M.A.L. 4.03 Microcontroller Board; Pt.1 by Barry Rozema
  7. Project: An Automatic Nicad Battery Discharger by Bernie Gilchrist
  8. Serviceman's Log: I did it; but it wasn't my fault by The TV Serviceman
  9. Subscriptions
  10. Vintage Radio: Coverting a battery set to mains operation by John Hill
  11. Project: An Infrared Night Viewer by Branko Justic
  12. Feature: Amateur Radio by Garry Cratt, VK2YBX
  13. Project: Simplifying The Interphone Telephone Exchange by Leo Simpson
  14. Feature: The Story Of Electrical Energy; Pt.21 by Bryan Maher
  15. Feature: Computer Bits by Darren Yates
  16. Back Issues
  17. Order Form
  18. Market Centre
  19. Advertising Index
  20. Outer Back Cover

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

You can view 52 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.2":
  • 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, November 1992 - 2kW 24V/240VAC Sinewave Inverter Pt 2 (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:
  • The M.A.L. 4.03 Microcontroller Board; Pt.1 (November 1992)
  • The M.A.L. 4.03 Microcontroller Board; Pt.2 (December 1992)
  • The M.A.L. 4.03 Microcontroller Board; Pt.3 (February 1993)
Items relevant to "An Automatic Nicad Battery Discharger":
  • Silicon Chip article scan, November 1992 - Nicad Battery Discharger (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:
  • 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)
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. 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. 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 WEATHER FAX programs for IBM XT/ ATs *** "RADFAX2" $35 is a high reso- lution, 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. SPRINKLER CONTROLLER KIT: get ready for summer with this very popular kit. Very reliable and versatile design can control eight stations and has 32 programmable START and RUN times (refer SILICON CHIP, July 1992). All settings stored in EEPROM. Can be expanded to 64 with the addition of extra memory chip and switch. Requires 24V AC to run. Complete kit including 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 D Bankcard D Visa Card D Master Card I I I I I I I I I 102 SILICON CHIP NEW 280 SINGLE BOARD COMPUTER: designed for the 1990s.Also modern kits. Local SAE for details. DIY Electronics, GPO Box 904, Hong Kong. THE HOMEBUILT DYNAMO: (plans) brush less, 1000 watt at 740 revs. $A85 postpaid airmail from Al Forbes, PO Box 3919 - SC, Auckland, New Zealand. Phone Auckland (09) 818 8967 anytime. VALVE RADIO RESTORATION BUSINESS: established 7 years. Specialising in vintage & classic car radios; sole agents in Australia for FM conversion units and solid state vibrators. Ideal opportunity for technician (ex-Telecom?) to purchase a well-established business situated in a popular, progressive Melbourne shopping centre. Long lease available. For further information contact: Nostalgic Wireless, PO Box 144, Surrey Hills, Vic 3127. x I I I I Signature_ _ _ __ _ _ _ _ _ _ Card expiry date_ __c/_ __ I I I Name _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __ I I I I Street - - - - - - - - - - ~ - - - - - - - - - - - - I I Suburb/town _ _ _ _ _ _ _ _ _ _ _ Postcode_ _ _ _ __ I IL _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ JI Card No. LCD & case $135 (inc. p&p). Relays extra at $3.75 each (controller requires 9 for full kit). FROST SWITCH KIT also available. Remote temperature probe starts the above controller in a fully programmable sequence, when temperature falls to a user selectable value (controller requires modified S/W). $60 incl. reprogramming and p&p.Available from Graham Blowes, 38 Garnet St, Niddrie, 3042. Phone (03) 337 1917 AH or (03) 575 3349 BH. Fax (03) 575 3369. 8051 MICROCOMPUTER PROTOTYPING PCB $30 - similar to my ROMLoader EA Jan 92. Provision for 8255 PPI, 9346 EEPROM, 2K-32K SRAM, 2K-32K EPROM, MAX232, DIP switches & expansion header. Send A4 SAE for article. Tantau, PO Box 206, Gordon 2072. 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 (figure-8) $15 per 100m. PIR 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. NICAD BATTERIES: D-size 4Ah. At less than half price it's the best deal in town. $4.90 each plus p&p. Phone (052) 78 8298. KIT REPAIRS: fixed price servicing for all kits, no job too small, only quality components used. Ph (02) 649 2134 after 5pm. SURPLUS COMPONENTS: 747CJ OIL ceramic $1 ea or 25 for $20; 150Q 1OW resistors $1 ea or 10 for $8; Bourns 3386 trimpots 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 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, POBox 2215, Brookside Old 4053. HARD DRIVE: Maxtor voice coil IDEAT. Factory warranty. Great bargain. New 120Mb $560, 200Mb $860. Mail MEMORY EXPANSION PRICES AT SEPT 9TH, 1992 SIMM 1Mb x 5 ?Ons 1Mb x 3 ?Ons 1Mb x 8100ns 4Mb x 9 80ns 4Mb x 8 8Qns (For SIP add $1.00) DRAM DIP 1 x1Mb70ns 256 x 4 ?Ons 41256 80ns 1Mb x 4 (slat) $46 $42 $37 $164 $152 $5 $5 $2 $23 DRIVES SEAG 130Mb 19M SEAG 44Mb 28M C'NER 200/12 C'NERS0/19 $438 $260 $750 $335 IBM PS.2 50/55/70 2Mb 70/35 4Mb $115 $180 TOSHIBA T3200SX 2Mb T44/6400 4Mb T5200 2Mb $135 $350 $135 MAC 16MbOUADRA 2MbSl&LC 4Mb P'Book $780 $83 $260 BOARDS 8MbATW2MB $232 8Mb PS2W2MB $234 4Mb HP LaserW2MB $155 8Mb PANAS W2MB $170 1Mb TI W1MB $80 Sales lax 20%. Overnight delivery. Credi! cards welcome. Ring for Latest Prices • Plans Kits and PCBs 1O0W Valve Amp PCB ......................... $30 Valve Amp PSU PCB ............... ............................ .. $25 Universal PSU (±5/±12V) Dual Supply .................... $10 Digi 125 100W amp/pair ....... $1 0 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 ................ $1 0 AGC Amp PCB .................... ......................... .. ......... $7 Z-80 Miniprocessor PCB .......................................... $50 6502 Miniprocessor PCB ......................................... $50 6809 Miniprocessor PCB .............. :..... $50 8048/8049 Developers board complete B& T ........... $199 IBM PC Prototype PCB .............................................. $50 EPROM Programmer .............................................. $299 . ESL-t Electrostatic speaker kit/pair inc manual ...... $899 ESL-t Assembly Manual ........ $50 P.C. Computers (08) 332 6513 36 Regent St, Kensington SA. PELHAM Tel: (D2) 980 6988 Fax: (02) 980 6991 1st Floor, 100 Yarrara Rd, PO Box 382, Pennant Hills, NSW 2120. FIX-A-KIT KIT REPAIR & CONSTRUCTION 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) 761291. Fax : (065) 76 1003. . order welcome. Altec Pacific. BH (03) 800 2007. Fax (03) 800 3363. AH (03) 801 4391 Wantirna. GAS LASER: a very small brand new 0.2-0.5mW visible red helium-neon laser tube, plus a kit of parts for a small inverter that will run from a 7.2V nicad battery pack. Suits laser pointers, etc. Incredible value at $50 for the tube and (02) 633 5477 supply.* VISIBLE LASER DIODE BARGAIN: brand new 5mW 670nm laser diode, plus a collimating lens, plus a driver kit plus a housing and instruc- · tions. Introductory price $85. * ELECTRONIC KEY: use it to activate door strikers for entering buildings, car alarms, central locking. The most secure key ever (see EA, July 1992). On special<at> $49.90 for two keys and one LOCAL TRADES & SERVICES JV Tuners - Repairs Transformer Rewinds 'I: A. Mowles For all types of transformer rewinds. Printed circuit boards for the hobbyist. For ser\'ice & enquiries contact: (02) 7741154 Fax (02) 7741154 (065) 761291 Fax (065) 761003 (08)3265590 Ian J Truscott 's Electronic World EEM Electronics Silicon Chip * Tuner • • • • repairs for TVs & VCRs Shorted Turns Tester lligh Voltage Probe Degaussing Wand Remote Control Tester * For sen ire~~ repair ,rnrk \Jail or credit card facilities (03) 7233344 Fax (03) 4192808 Printed cirrnit hoard assemhl~. itch mode 1>ower supplies repaired. Design ,1ork from start to finish. Ring anytime 9am-9pm Mo.n-Sun. S\\ (03) 4011393 To achertise your products or st·n ices. please call Sharon on (02)9795644(018)285532 N OVE MBER 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. Advertising Index All Electronic Components .. ... ... 45 Altronics .... ... ...... .... ............... 76-78 Antique Radio Restorations ..... 102 A-One Electronics ................ 38-39 Av-Comm ................................... 75 * High quality. * Hold up to 14 issues Breakthrough Computers .......... 71 David Reid Electronics .. ....... ..... .. 3 * 80mm internal width. Dick Smith Electronics .......... 10-15 EEM Electronics ........ .............. 103 * SILICON CHIP logo printed in goldcoloured lettering on spine & cover. Electronic World ..... .. .......... 67,103 Emona Instruments ................... 47 Yes! Please send me _ _ _ SILICON CHIP binder(s) at $A11.95 plus $A3 p&p each (NZ $A6 p&p). Geoff Wood Electronics ............ ... 5 Enclosed is my cheque/money order for $_ _ _ _ or please debit my Hycal Instruments .................... 103 D Bankcard O Visa Card O Master Card Harbuch Electronics .................. 21 lcom Australia .................. ........ IBC Jaycar Electronics ................ 49-56 Card No. JV Tuners ............... .. ............... 103 Oatley Electronics .. .... .... .... 73, 103 Signature_ _ _ __ _ _ _ _ __ Card expiry date_ _ _/_ __ PC Computers .. ....... ,............... 103 Name _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __ Pelham .... .. ... ........................... 103 Peter C. Lacey Services ............ 44 Street _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __ Suburb/town _ _ _ __ _ _ _ _ _ _ Postcode_ _ _ _ __ Philips Test & Measurement .. OBC RCS Radio ... ................ ........... 104 Resurrection Radio .................... 61 SILICON CHIP PUBLICATIONS PO Box 139, Collaroy Beach, NSW 2097, Australia. Phone (02) 979 5644 Fax: (02) 979 6503. L-------------------------J Rod Irving Electronics .......... 90-95 Scan Audio .. ........ ...................... 87 Silicon Chip Back Issues ..:... 96,97 Silicon Chip Binders ... ........ 21,104 decoder kit.* ULTRASONIC CAR BURGLAR ALARM BARGAIN: PCB and on-board components kit for the project featured in SILICON CHIP May 1988 edition. No screw terminals but we supply a pair of 40kHz transducers: $24.90. * LIGHT MOTION DETECTOR: small PCB assembly based on a ULN2232 IC. This device has a built-in light detector, filters, timer, narrow angle lens, and even a siren driver circuit that can drive an external speaker. Will detect human beings at distances up to 3 metres. Can be used at very low light levels and even in total darkness. With IR LED. Full information provided. The IC only is worth $16! Our price for the assembly is $6 ea. or 5 for $25. *STEPPER MOTORS: 5V, 7.5-deg., 6.6-ohm, 2-phase. Brand new $12. 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. St Lucia .. .... ..... .......................... 23 T. A. Mowles ............................ 103 Tektronix ...... ........ .......... ..... ..... IFC Transformer Rewinds .............. 103 RC§ RADIO PTY LTD ~;i~1,~ ::=J ~I Ill I [lo16Jf 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 CHIP 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.