Silicon ChipMarket Centre - May 1993 SILICON CHIP
  1. Outer Front Cover
  2. Contents
  3. Publisher's Letter: Silicon Chip to be published in the USA
  4. Review: Dynaudio Image 4 Loudspeakers by Leo Simpson
  5. Feature: The Microsoft Windows Sound System by Darren Yates
  6. Project: A Nicad Cell Discharger by John Clarke
  7. Project: Build The Woofer Stopper by Darren Yates
  8. Project: Remote Volume Control For Hifi Systems; Pt.1 by John Clarke
  9. Serviceman's Log: From little acorns, giant oak trees grow by The TV Serviceman
  10. Feature: Remote Control by Bob Young
  11. Vintage Radio: A few old receivers from the 1920s by John Hill
  12. Project: Alphanumeric LCD Demonstration Board by Darren Yates
  13. Project: A Low-Cost Mini Gas Laser by Flavio Spadalieri
  14. Product Showcase
  15. Feature: Computer Bits by Joe Elkhorne
  16. Feature: Amateur Radio by Garry Cratt, VK2YBX3
  17. Back Issues
  18. Feature: The Story Of Electrical Energy; Pt.24 by Bryan Maher
  19. Order Form
  20. Market Centre
  21. Advertising Index
  22. Outer Back Cover

This is only a preview of the May 1993 issue of Silicon Chip.

You can view 51 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.

Items relevant to "A Nicad Cell Discharger":
  • Nicad Cell Discharger PCB pattern (PDF download) [14305931] (Free)
Items relevant to "Build The Woofer Stopper":
  • Silicon Chip article scan, May 1993 - Woofer Stopper (AUD $10.00)
  • Woofer Stopper PCB pattern (PDF download) [03105931] (Free)
Items relevant to "Remote Volume Control For Hifi Systems; Pt.1":
  • Remote Volume Control for Hifi Systems PCB patterns (PDF download) [01305931/2] (Free)
Articles in this series:
  • Remote Volume Control For Hifi Systems; Pt.1 (May 1993)
  • Remote Volume Control For Hifi Systems; Pt.2 (June 1993)
Articles in this series:
  • Remote Control (May 1993)
  • Remote Control (June 1993)
  • Remote Control (July 1993)
  • Remote Control (August 1993)
Items relevant to "Alphanumeric LCD Demonstration Board":
  • DOS software for the Alphanumeric LCD Demo Board (Free)
  • Alphanumeric Display Demo Board PCB pattern (PDF download) [07106931] (Free)
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)
. . . . .TCENTRE Cash in your surplus gear. Advertise it here in Silicon Chip. r-------------------------, ANTIQUE RADIO CLASSIFIED ADVERTISING RATES ANTIQUE RADIO RESTORATIONS : specialist restoration service provided for vintage radios, test equipment & sales. Service includes chassis rewiring, recondensering, valve testing and mechanical refurbishment. Rejuvenation of wooden, bakelite & metal cabinets. Plenty of parts - no catalog require details for mail order. About 1200 radios within 16,000 sq ft. 2-year warranty on full restoration. Open Sat 10am4.30pm; Sun 12.30-4.30pm. 109 Cann St, Bass Hill, NSW 2197 Phone (02) 645 3173 BH or (02) 7261613AH. Advertising rates for this page: Classified ads: $10.00 for up to 12 words plus 50 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 in the space 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. . WANTED WANTED!: Toshiba EHT transformer part no. TFB3003B to suit C-2020 colour TV. Phone (057) 83 2227 any time please. FOR SALE Enclosed is my cheque/money order for $_ _ _ _· or please debit my □ Bankcard □ Visa Card □ 0 Master Card J LL =u L__IL__L__c____JI I~~ ~ XI I I Signature _ _ __ _ _ _ _ _ _ _ Card expiry date_ __c/_ __ I I Name _ _ __ __ _ _ _ _ _ _ __ _ _ _ _ _ _ __ _ I I Street _ _ _ _ _ _ _ _ _ _ _ _ __ _ _ __ _ _ _ __ I Suburb/town _ _ _ _ _ _ _ _ _ _ _ Postcode _ _ _ _ __ I L _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ JI Card No. 94 SILICON CHIP 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 documenti:ltion. Add $3 postage. Only from M. Delahunty, 42 Villiers St, New Farm , Old 4005.'Phone (07) 358 2785. 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 any time. BURGLAR ALARM KIT: Control panel (no case) $180.00; Remote Keypad SURPLUS COMPONENT SALE STOCK QTYS LIMITED, NO BACK ORDERS 2N3055 $1.20 RESISTORS TIP30C $0,50 MOST VALUES AVAIL TIP122 $1.20 1/4W M/FILM $3/100 2N7000 $1.50 1/3W CARBON $2/100 2SC2240 $0.60 1/2W CARBON $4/100 VN88 $2,00 1WCARBON $5/100 3N170 $1,50 2W CARBON $8/100 2N5954 $1 ,50 SW WIREWOUND $0.30 2N3440 $1.20 1OW RESISTORS $0,60 CONNER 120MB IDE HARD DISKS $525,00 KEYTRONICS KB 3270PC KEYBOARDS $220.00 HEWLETT PACKARD 545A LOGIC PROBE $55 HEWLETT PACKARD 546A LOGIC PULSER $75 ONE ONLY H.P, CURRENTTRACER 547A $75 ONE BWD 245A DUAL POWER SUPPLY $450 VALVES 1.44MB FDD $95.00 3A4 $8,00 1MB SVGA $125.00 417A $8.00 CHECKIT PRO $179.00 5651 $8,00 MOC3020 OPTO $2,00 5R4GY $8.00 MOC8050 OPTO $1.50 EL32 $8.00 74C161 $2.00 ONE ONLY TBL 12/30 TRANSMIT TUBE $2700,00 PHONE OR MAIL ORDERS, CREDIT CARDS ACCEPTED FOR ORDe'RS $20 & OVER, DISCOUNTS FOR QUANTITY ORDERS SECONTRONICS PO BOX 2215, BROOKSIDE, QL04053, PHONE (07) 3551314 143 GRAYS RD, ENOGGERA, QLD 4051, FAX (07) 8551014 SHOP OPEN SATURDAY 9AM • 4PM AH (07) 855 1880 $45.00; P&P $16.00. Michael Zenere, 7 Hayfield Rd, My Waverley, Vic 3144. Phone (03) 803 1831. SINGLE CHIP MICROCONTROLLER: 1.8K Eprom. 1-10 = $13.00 ea; 11-100 = $12.00 ea. P&P $2.00. Michael Zenere, 7 Hayfield Rd, My Waverley, Vic 3144. Phone (03) 803 1831. UNUSUAL BOOKS: electronic devices, fireworks, locksmithing, radar invisibility, surveillance, self-protection, unusual chemistry and more. For a complete catalog send 95c in stamps to: Vector Press, Dept S, PO Box 434, Brighton SA 5048. KIT REPAIRS & CONSTRUCTION service. Fixed price servicing for all kits. No job too small. Ph (02) 649 2134 after 5pm. VARIAC 0-280VAC: 8-amp Warburton Franki type W20. Hardly used. $200. Minto (02) 820 2244. ADD A CIRCLE PATTERN to SILICON CHIP's colour TV pattern generator. Fully assembled and tested PCB with mounting hardware and installation instructions. Easy to install. $45 includes postage. Placid Talia, 37 Kionga St, Clayton 3168. Phone (03) 720 7700, AH (03) 543 3561. DON'S PROMO DISK: $2 (720Kb 3.5inch IBM). Little kits & tiny computers: Printer Port Expansion kit, 4Mb Printer Buffer, Z80 Development Board, I MEMORY & DRIVES ICL 286 Board PRICES AT MARCH 23RD, 1993 All in one board with two serial, printer, IBM keyboard, highdensity lloppy & IDE mono video interface. Up to 4Mb RAM, 80286-16cpu, MS-DOS compatible, 130 page manual, small size 170mm x 255mm. Laptop power supply 240V 5V/ 3A 12Vr3A $89 $299 lnlrared sets, 1 each IR LED, diode & IDC header $1 Ampro little PC Audio IChybrids STK043-25 or STK058-40W $9,95 SIMM 1Mbx9 ?Ons 4Mb (72-pin) 4Mb x 9 ?Ons 4Mb x 8 80ns DRAM DIP 1 x 1Mb 256 X 4 41256 1Mbx4 $53 $210 $210 $195 ?Ons $6,00 $6,25 ?Ons $2,50 80ns ZorD $24.00 DRIVES SEAG 42Mb SEAG 89Mb SEAG 107Mb SEAG 130Mb SEAG 245Mb 28ms 14ms 15ms 16ms 12ms $240 $322 $350 $375 $635 IBM PS,2 50/55(70 70/35 90/95 2Mb 4Mb 4Mb $130 $220 $220 TOSHIBA T3200SX T44/6400 T5200 4Mb 4Mb 2Mb $270 $240 $150 MAC 2Mb s1 ·& LG 4Mb P'Book $108 $270 CO-PROCESSORS 387SX 20/25 IIT $130/5 387DX All Intel $140 EPROMS 27C 4Mb15 $16 Sales tax 20%. Overnight delivery. Credit cards welcome, All in one NEC V40 CPU board, MS-DOS compatible, highdensity floppy, SCSI hard disk, 2 serial, printer, solid state hard disk, IBM keyboard interface, (4W), CMOS single +SV rail, up to 768Kb RAM, 384Kb ROM, 145mm x 250mm, 98-page manual. $299 Ring for Latest Prices 1st Floor, 100 Yarrara Rd, PO Box 382, Pennant Hills, 2120. Tel:(02)9806988 Fax: (02) 980 6991 pivTHr A ""AH L'.JL rllt'.i TRANSFORMER REWINDS .,> Fujitsu 40Mb hard disks $269 Microbyte-PC230 v30 CPU board, t Mb RAM installed, 2 serial, printer, 720Kb floppy, SCS1 hard disk, EGA video, IBM kb interface, made in Australia, surplus $185 ea ALL TYPES OF TRANSFORMER REWINDS 720Kb Floppy Drives $55 TRANSFORMER REWINDS 1.44Mb Floppy Drives $89 Reply Paid No.2, PO Box 438, Singleton, NSW 2330. Ph: (065) 761291. Fax: (065) 761003. '/le buy surplus computer & electronic products, bankrupt stock and components. P. C Computers ACTIVE DISTRIBUTORS REQ'D AUSTRALIA & NEW ZEALAND UCANDO VCR EDUCATIONAL PRODUCTS COMPANY Unique copyrighted animated UCANDO videos for electronics & digital/computer training . USA sales US$6,000,000 year. Also sold in UK & Europe. PO Box 4603, Christchurch, New Zealand. Ph/Fax 3 379 5570. • • Bargains Taped components by the metre app 200pcs, tants, caps, zeners, diodes, resistors $5,95/metre 600-600 ohm audio output transformers PCB mount 18Hz38kHz. $9.95 Kits Max 1/0 kit for PCs, 7 relays, ADC, DAC, stepper driver, TTL inputs, with software $169 PC 1/0 card with 8255 chip 24 1/0 lines programmable as inputs or outputs $69 1.5 watt AM broadcast transmitter XTAL locked $49 2.5 watt FM broadcast transmitter 88-108MHz. $49 Digi-125 audio power amp(over 19 ,000 sold since 1987) 50 watV8 $14 125 watt/4 $19 New 200 watt/2 version $29 lnlrared relay kit $9 Remote control tester $4 36 Regent St, Kensington, SA. Phone (08) 332 6513, FIX-A-KIT KIT REPAIR & CONSTRUCTION 3 MONTHS WARRANTY ON REPAIRS 12 MONTHS WARRANTY ON CONSTRUCTION TECHNICAL ASSISTANCE HVCAL ELECTRONICS Design, Manufacture & Repair of Electronic Equipment (02) 633 5477 Amstrad Notepad, Atari Portfolio, and lots more. Don McKenzie, 29 Ellesmere Crescent, Tullamarine 3043. Phone (03) 338 6286. GATES BATTERIES: famous GATES batteries at a giveaway price. We have a limited quantity of BRAND NEW 4V dual cell 5Ah gel batteries at a giveaway price of $10 per pack: DON'T MISS OUT AND WHINGE AFTERWARDS! HIGH INTENSITY LEDs: high intensity narrow angle 5mm red LEDs in a clear housing, with a luminous power output of around 1000mCD <at> 20mA. That's more than 1000 times brighter than normal red LEDs. SPECIAL INTRODUCTORY PRICE of 50c ea. or 10 for $4, or 100 for $30. UNBELIEVABLE! GLASS PRISMS: a pair of very large precision glass prisms that were removed from tank night viewers. One surface of one of the prisms was exposed to the weather and is contained in an aluminium housing, whilst the other was sealed within the viewer. Very heavy! Limited stock at $26 per pair. IR PHOTOINTERRUPTER: an IR LED and an IR transistor in a slotted PCB moul)ting assembly. The discrete components are easy to separate, as the assembly clips together. Great for IR experiments, $2 ea. or 10 for $15. 1INCH CRO TUBE: new 1-inch CRO tube plus a connecting diagram, plus a simple experimental circuit. Very limited quantities. CLEARANCE <at> $20. SWITCHED MODE POWER SUPPLIES: brand new complete assem- MA Y 1993 95 LOCAL TRADES & SERVICES Advertising Index Altronics ... .... .. .. ...... .... .. . IFC,60-63 T. A. Mowles Transformer Rewinds Printed circuit boards for the hobbyist. For service & enquiries contact: For all types of transformer rewinds. (08) 3265590 (065} 761291 Fax (065) 761003 Antique Radio Restorations ...... 94 A-One Electronics ... ... .. .. ...... 76,77 Av-Comm ... ..... ... .... ..... .... .. ...... .. 54 Coman ... ... ... .... .. .. .. .... ... ........ .. .. 89 David Reid Electronics ....... ......... 3 Dick Smith Electronics .... ..... 24,25 Silicon Chip EEM Electronics · To advertise your products or services, please call Sharon on Printed circuit board assembly, switchmode power supplies repaired. Design work from start to finish. Ring anytime 9am-9pm Mon-Sun. (02) 9795644 (018) 285532 (03) 4011393 EEM Electronics .. ............. ..... .... 96 Harbuch Electronics ... ...... ... ...... 43 Hewlett Packard ... .. ..... ..... .... ... IBC Jaycar ... ... .... .......... ..... ......... 45-52 JV Tuners ..... ... .... .. ...... .... .......... 43 Kalex .... ............ .... ..................... 59 closed in a small black metal case. blies consisting of a large PCB on an Lshaped aluminium heatsink. Overall diContains a small battery (G13) and a mensions 260 x 230 x 70mm - large! microphone; 32 x 23 x 11mm! Bargain at $32. FM MICROPHONE: features a 110/240V input. Outputs +5V, -5V, + 12V, -12V. We have no further specs but unit stainless steel case and a unidirectional appears to be of a much higher power microphone insert, powered by two AA batteries. High quality at $32. DYNAMIC rating than a typical computer power MICROPHONE: stage quality 600-ohm supply. Circuit provided. LIMITED QUANTITY <at> $25 ea. FANS: brand · dynamic microphone in a black metal case $39. ELECTRONIC KEY: use it to new German-made PAP ST brand 115V activate door strikers for entering build12W fans with metal blades. Overall dimensions 80 x 80 x 38mm. Use two in ings, for switching car alarms, central locking, the most secure key ever (see series to run off mains? Only $14 ea. EA July 1992) . On special<at>$49.90 for UNUSUAL ITEMS & COMPONENTS: two keys & one decoder kit. Major cards 20kV PIV 5mA av/1 A pk fast diodes $1 .50ea; 3kV PIV 300mA/30A pk fast accepted with phone & fax orders. Total diodes 60c ea; 30V PIV 1A/23A pk cost of certified P&P in Australia $5; in NZ (airmail) $10. Oatley Electronics, Schottky Barrier diodes 45c ea. 680pF/ PO Box 89, Oatley, NSW, Australia 3kV disc ceramic capacitors 30c 2223. Phone (02) 579 4985. Fax (02) ea.1000pF/15kV disc ceramic capaci570 7910. tors $5 ea. 0.01 µF 5kV disc ceramic capacitors $1.80 ea. Flexible DECIMAL KEYPADS with PCB connectors to suit $1 .50 ea. High quality UNIDIRECRC§ RADITO PTY LTD TIONAL ELECTRET microphone inserts $8 .50. Stage quality UNIDIRECTIONAL DYNAMIC microphone inserts $9 .60. 100 LED BARGRAPH DISPLAY: yes 100 LEDs plus IC control 6 circuitry, all surface mounted on a long strip of PCB. A4-bit binary code selects RCS Radio Pty Ltd is the only company that manufactures and sells which one out of the 10 LED groups will every PC board and front panel be on, whilst another 4-bit binary code selects which one of each group of 10 published in SILICON CHiP, ETI and LEDs will be on. Latching inputs are EA. also provided. We include a circuit and RCS Radio Pty Ltd, a connecting diagram . VERY LIMITED 651 Forest Rd, Bexley 2207. QUANTITY <at> $7 ea. MINIATURE FM Phone (02) 587 3491 TRANSMITTER: ready made and en- ~i~1,~ 0°i Ui!-ol Ill ::;=J 96 S1ucoN CwP I Kenwood Australia ... .. ... ..... .... OBC Oatley Electronics ........... 31,69,95 PC Computers ... .. ....... ............. . 95 Pelham ..... .. .... .. .. .... .... ... .... .... .... 95 Peter C: Lacey Services ... .. .. .... 40 RCS Radio ........... ... .. .... ... ...... ... 96 Rod Irving Electronics .. ..... ... 10-15 Secontronics .. ..... ..... ... .... ...... .... 95 Silicon Chip Back Issues .. .. .. 84,85 Silicon Chip Binders ..... .... ......... 58 T. A. Mowles ... .... ..... ............ .. .... 96 Technical Applications .... ....... .... 41 Transformer Rewinds ............ .... 96 Ucando ... ......... .. ...... ... .... ....... .... 95 PC Boards Printed circuit boards for SILICON CHIP projects are made by: • ~emal Products, 5 Forge St, Welshpool, WA 6106. Ptione (09) 350 5555. • Marday Services, PO Box 19-189, Avondale, Auckland, NZ. Phone (09) 828 5730. • RCS Radio Pty Ltd, 651 Forest Rd , Bexley, NSW 2207. Phone (02) 587 3491.