Silicon ChipMarket Centre - June 1997 SILICON CHIP
  1. Outer Front Cover
  2. Contents
  3. Publisher's Letter: Cellular phones & Radio Australia
  4. Feature: Using Robots For Water-Jet Cutting by ABB
  5. Project: PC-Controlled Thermometer/Thermostat by Mark Roberts
  6. Project: Colour TV Pattern Generator; Pt.1 by John Clarke
  7. Project: High-Current Speed Controller For 12V/24V Motors by Rick Walters
  8. Order Form
  9. Back Issues
  10. Project: Build An Audio/RF Signal Tracer by Rick Walters
  11. Feature: Satellite Watch by Garry Cratt
  12. Feature: Turning Up Your Hard Disc Drive by Jason Cole
  13. Serviceman's Log: I don't like house calls by The TV Serviceman
  14. Project: Manual Control Circuit For A Stepper Motor by Rick Walters
  15. Feature: Cathode Ray Oscilloscopes; Pt.10 by Bryan Maher
  16. Feature: Radio Control by Bob Young
  17. Vintage Radio: A look at signal tracing; Pt.3 by John Hill
  18. Product Showcase
  19. Notes & Errata: Bridged Amplifier Loudspeaker Protector, Apr 1997; Extra Fast NiCad Charger, Oct 95
  20. Book Store
  21. Market Centre
  22. Advertising Index
  23. Outer Back Cover

This is only a preview of the June 1997 issue of Silicon Chip.

You can view 31 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 "Colour TV Pattern Generator; Pt.1":
  • Colour TV Pattern Generator DOS software (Free)
  • Colour TV Pattern Generator PCB patterns (PDF download) [02305971/2] (Free)
Articles in this series:
  • Colour TV Pattern Generator; Pt.1 (June 1997)
  • Colour TV Pattern Generator; Pt.1 (June 1997)
  • Colour TV Pattern Generator; Pt.2 (July 1997)
  • Colour TV Pattern Generator; Pt.2 (July 1997)
Items relevant to "High-Current Speed Controller For 12V/24V Motors":
  • High-Current Speed Controller PCB pattern (PDF download) [11106971] (Free)
Items relevant to "Build An Audio/RF Signal Tracer":
  • Audio/RF Signal Tracer PCB [04106971] (AUD $5.00)
  • Audio/RF Signal Tracer PCB pattern (PDF download) [04106971] (Free)
  • Audio/RF Signal Tracer panel artwork (PDF download) (Free)
Articles in this series:
  • Satellite Watch (January 1996)
  • Satellite Watch (January 1996)
  • Satellite Watch (February 1996)
  • Satellite Watch (February 1996)
  • Satellite Watch (March 1996)
  • Satellite Watch (March 1996)
  • Satellite Watch (June 1996)
  • Satellite Watch (June 1996)
  • Satellite Watch (August 1996)
  • Satellite Watch (August 1996)
  • Satellite Watch (October 1996)
  • Satellite Watch (October 1996)
  • Satellite Watch (December 1996)
  • Satellite Watch (December 1996)
  • Satellite Watch (February 1997)
  • Satellite Watch (February 1997)
  • Satellite Watch (April 1997)
  • Satellite Watch (April 1997)
  • Satellite Watch (May 1997)
  • Satellite Watch (May 1997)
  • Satellite Watch (June 1997)
  • Satellite Watch (June 1997)
  • Satellite Watch (December 1997)
  • Satellite Watch (December 1997)
  • Satellite Watch (April 1998)
  • Satellite Watch (April 1998)
  • Satellite Watch (January 1999)
  • Satellite Watch (January 1999)
  • Satellite Watch (June 1999)
  • Satellite Watch (June 1999)
Articles in this series:
  • Computer Bits (July 1989)
  • Computer Bits (July 1989)
  • Computer Bits (August 1989)
  • Computer Bits (August 1989)
  • Computer Bits (September 1989)
  • Computer Bits (September 1989)
  • Computer Bits (October 1989)
  • Computer Bits (October 1989)
  • Computer Bits (November 1989)
  • Computer Bits (November 1989)
  • Computer Bits (January 1990)
  • Computer Bits (January 1990)
  • Computer Bits (April 1990)
  • Computer Bits (April 1990)
  • Computer Bits (October 1990)
  • Computer Bits (October 1990)
  • Computer Bits (November 1990)
  • Computer Bits (November 1990)
  • Computer Bits (December 1990)
  • Computer Bits (December 1990)
  • Computer Bits (January 1991)
  • Computer Bits (January 1991)
  • Computer Bits (February 1991)
  • Computer Bits (February 1991)
  • Computer Bits (March 1991)
  • Computer Bits (March 1991)
  • Computer Bits (April 1991)
  • Computer Bits (April 1991)
  • Computer Bits (May 1991)
  • Computer Bits (May 1991)
  • Computer Bits (June 1991)
  • Computer Bits (June 1991)
  • Computer Bits (July 1991)
  • Computer Bits (July 1991)
  • Computer Bits (August 1991)
  • Computer Bits (August 1991)
  • Computer Bits (September 1991)
  • Computer Bits (September 1991)
  • Computer Bits (October 1991)
  • Computer Bits (October 1991)
  • Computer Bits (November 1991)
  • Computer Bits (November 1991)
  • Computer Bits (December 1991)
  • Computer Bits (December 1991)
  • Computer Bits (January 1992)
  • Computer Bits (January 1992)
  • Computer Bits (February 1992)
  • Computer Bits (February 1992)
  • Computer Bits (March 1992)
  • Computer Bits (March 1992)
  • Computer Bits (May 1992)
  • Computer Bits (May 1992)
  • Computer Bits (June 1992)
  • Computer Bits (June 1992)
  • Computer Bits (July 1992)
  • Computer Bits (July 1992)
  • Computer Bits (September 1992)
  • Computer Bits (September 1992)
  • Computer Bits (October 1992)
  • Computer Bits (October 1992)
  • Computer Bits (November 1992)
  • Computer Bits (November 1992)
  • Computer Bits (December 1992)
  • Computer Bits (December 1992)
  • Computer Bits (February 1993)
  • Computer Bits (February 1993)
  • Computer Bits (April 1993)
  • Computer Bits (April 1993)
  • Computer Bits (May 1993)
  • Computer Bits (May 1993)
  • Computer Bits (June 1993)
  • Computer Bits (June 1993)
  • Computer Bits (October 1993)
  • Computer Bits (October 1993)
  • Computer Bits (March 1994)
  • Computer Bits (March 1994)
  • Computer Bits (May 1994)
  • Computer Bits (May 1994)
  • Computer Bits (June 1994)
  • Computer Bits (June 1994)
  • Computer Bits (July 1994)
  • Computer Bits (July 1994)
  • Computer Bits (October 1994)
  • Computer Bits (October 1994)
  • Computer Bits (November 1994)
  • Computer Bits (November 1994)
  • Computer Bits (December 1994)
  • Computer Bits (December 1994)
  • Computer Bits (January 1995)
  • Computer Bits (January 1995)
  • Computer Bits (February 1995)
  • Computer Bits (February 1995)
  • Computer Bits (March 1995)
  • Computer Bits (March 1995)
  • Computer Bits (April 1995)
  • Computer Bits (April 1995)
  • CMOS Memory Settings - What To Do When The Battery Goes Flat (May 1995)
  • CMOS Memory Settings - What To Do When The Battery Goes Flat (May 1995)
  • Computer Bits (July 1995)
  • Computer Bits (July 1995)
  • Computer Bits (September 1995)
  • Computer Bits (September 1995)
  • Computer Bits: Connecting To The Internet With WIndows 95 (October 1995)
  • Computer Bits: Connecting To The Internet With WIndows 95 (October 1995)
  • Computer Bits (December 1995)
  • Computer Bits (December 1995)
  • Computer Bits (January 1996)
  • Computer Bits (January 1996)
  • Computer Bits (February 1996)
  • Computer Bits (February 1996)
  • Computer Bits (March 1996)
  • Computer Bits (March 1996)
  • Computer Bits (May 1996)
  • Computer Bits (May 1996)
  • Computer Bits (June 1996)
  • Computer Bits (June 1996)
  • Computer Bits (July 1996)
  • Computer Bits (July 1996)
  • Computer Bits (August 1996)
  • Computer Bits (August 1996)
  • Computer Bits (January 1997)
  • Computer Bits (January 1997)
  • Computer Bits (April 1997)
  • Computer Bits (April 1997)
  • Windows 95: The Hardware That's Required (May 1997)
  • Windows 95: The Hardware That's Required (May 1997)
  • Turning Up Your Hard Disc Drive (June 1997)
  • Turning Up Your Hard Disc Drive (June 1997)
  • Computer Bits (July 1997)
  • Computer Bits (July 1997)
  • Computer Bits: The Ins & Outs Of Sound Cards (August 1997)
  • Computer Bits: The Ins & Outs Of Sound Cards (August 1997)
  • Computer Bits (September 1997)
  • Computer Bits (September 1997)
  • Computer Bits (October 1997)
  • Computer Bits (October 1997)
  • Computer Bits (November 1997)
  • Computer Bits (November 1997)
  • Computer Bits (April 1998)
  • Computer Bits (April 1998)
  • Computer Bits (June 1998)
  • Computer Bits (June 1998)
  • Computer Bits (July 1998)
  • Computer Bits (July 1998)
  • Computer Bits (November 1998)
  • Computer Bits (November 1998)
  • Computer Bits (December 1998)
  • Computer Bits (December 1998)
  • Control Your World Using Linux (July 2011)
  • Control Your World Using Linux (July 2011)
Items relevant to "Manual Control Circuit For A Stepper Motor":
  • PC Stepper Motor Drivers DOS software (Free)
  • Stepper Motor Manual Control PCB pattern (PDF download) [09106971] (Free)
Articles in this series:
  • Cathode Ray Oscilloscopes; Pt.1 (March 1996)
  • Cathode Ray Oscilloscopes; Pt.1 (March 1996)
  • Cathode Ray Oscilloscopes; Pt.2 (April 1996)
  • Cathode Ray Oscilloscopes; Pt.2 (April 1996)
  • Cathode Ray Oscilloscopes; Pt.3 (May 1996)
  • Cathode Ray Oscilloscopes; Pt.3 (May 1996)
  • Cathode Ray Oscilloscopes; Pt.4 (August 1996)
  • Cathode Ray Oscilloscopes; Pt.4 (August 1996)
  • Cathode Ray Oscilloscopes; Pt.5 (September 1996)
  • Cathode Ray Oscilloscopes; Pt.5 (September 1996)
  • Cathode Ray Oscilloscopes; Pt.6 (February 1997)
  • Cathode Ray Oscilloscopes; Pt.6 (February 1997)
  • Cathode Ray Oscilloscopes; Pt.7 (March 1997)
  • Cathode Ray Oscilloscopes; Pt.7 (March 1997)
  • Cathode Ray Oscilloscopes; Pt.8 (April 1997)
  • Cathode Ray Oscilloscopes; Pt.8 (April 1997)
  • Cathode Ray Oscilloscopes; Pt.9 (May 1997)
  • Cathode Ray Oscilloscopes; Pt.9 (May 1997)
  • Cathode Ray Oscilloscopes; Pt.10 (June 1997)
  • Cathode Ray Oscilloscopes; Pt.10 (June 1997)
Articles in this series:
  • Radio Control (November 1996)
  • Radio Control (November 1996)
  • Radio Control (February 1997)
  • Radio Control (February 1997)
  • Radio Control (March 1997)
  • Radio Control (March 1997)
  • Radio Control (May 1997)
  • Radio Control (May 1997)
  • Radio Control (June 1997)
  • Radio Control (June 1997)
  • Radio Control (July 1997)
  • Radio Control (July 1997)
  • Radio Control (November 1997)
  • Radio Control (November 1997)
  • Radio Control (December 1997)
  • Radio Control (December 1997)
  • Autopilots For Radio-Controlled Model Aircraft (April 1999)
  • Autopilots For Radio-Controlled Model Aircraft (April 1999)
  • Model Plane Flies The Atlantic (May 1999)
  • Model Plane Flies The Atlantic (May 1999)
  • Tiny, Tiny Spy Planes (July 1999)
  • Tiny, Tiny Spy Planes (July 1999)
  • 2.4GHz DSS Radio Control Systems (February 2009)
  • 2.4GHz DSS Radio Control Systems (February 2009)
  • Unmanned Aerial Vehicles: An Australian Perspective (June 2010)
  • Unmanned Aerial Vehicles: An Australian Perspective (June 2010)
  • RPAs: Designing, Building & Using Them For Business (August 2012)
  • Flying The Parrot AR Drone 2 Quadcopter (August 2012)
  • Multi-Rotor Helicopters (August 2012)
  • Multi-Rotor Helicopters (August 2012)
  • Flying The Parrot AR Drone 2 Quadcopter (August 2012)
  • RPAs: Designing, Building & Using Them For Business (August 2012)
  • Electric Remotely Piloted Aircraft . . . With Wings (October 2012)
  • Electric Remotely Piloted Aircraft . . . With Wings (October 2012)
Articles in this series:
  • Amateur Radio (January 1988)
  • Amateur Radio (January 1988)
  • Amateur Radio (January 1990)
  • Amateur Radio (January 1990)
  • A look at signal tracing; Pt.2 (May 1997)
  • A look at signal tracing; Pt.2 (May 1997)
  • A look at signal tracing; Pt.3 (June 1997)
  • A look at signal tracing; Pt.3 (June 1997)

Purchase a printed copy of this issue for $10.00.
MARKET CENTRE Cash in your surplus gear. Advertise it here in Silicon Chip. CLASSIFIED ADVERTISING RATES FOR SALE 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): $25 per column centimetre (Max. 10cm). Closing date: five weeks prior to month of sale. C COMPILERS: Ever ything you need to develop C and ASM software for 68HC08, 6809, 68HC11, 68HC12, 68HC16, 8051/52, 8080/85, 8086 or 8096: $140.00 each. Macro Cross Assemblers for these CPUs + 6800/01/03/05 and 6502: $140.00 for the set. Debug monitors: $70 for 6 CPUs. All compilers inc ‘HC12, XASMs and monitors: $480. 8051/52 or 80C320 Simulator (fast): $70. Disassemblers for 12 CPUs only $75. Try the new C-FLEA Virtual Machine for small CPUs, build a “C-Stamp”. Demo disk: FREE. All prices + $5 p&p. GRAN­ T RONICS PTY LTD, PO Box 275, Wentworthville 2145. Ph/Fax (02) 9631 1236 or Internet: http://www.mpx.com.au/~lgrant. To run your classified ad, print it clearly on a separate sheet of paper, fill out the form below & send it with your cheque or credit card details to: Silicon Chip Classifieds, PO Box 139, Collaroy, NSW 2097. Or fax the details to (02) 9979 6503. _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________  Bankcard    Visa Card    Master Card Card No. ✂ Enclosed is my cheque/money order for $­__________ or please debit my Signature­­­­­­­­­­­­__________________________  Card expiry date______/______ Name ______________________________________________________ Street ______________________________________________________ Suburb/town ___________________________ Postcode______________ 94  Silicon Chip HOMEMADE GENERATORS: how to instructions. Eight pages free text and colour photos on the Internet at: http://www.onekw.co.nz/ !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! WARNING ! WARNING ! WARNING ! WARNING ! VIDEO CAMERA MODULES Beware of HIGHER prices for a similar Camera! BUY A BETTER CAMERA AT A LOWER PRICE! CHOOSE from..... 380, 420 & 460 TVL Resolution. Low Light & IR Sensitive 0.05 lux. TEENY WEENY 28 mm x 28 mm PCBs. ELEVEN Board Lenses. FOUR Pinhole Lenses. IR Cut/Pass & Polarising Filters. 845+ nm 74 mW IR LEDs. Ancillary Equipment. BEFORE & AFTER-SALES SERVICE, HELP & ADVICE! Before you Buy! Ask for our Detailed, Illustrated Price List with Application Notes. Also available CCTV Technical, Design & Reference Manuals & Inter-Active CD ROM. Allthings Sales & Services 08 9349 9413, fax 08 9344 5905. PCBs MADE, ONE OR MANY. Low prices, hobbyists welcome. Sesame Electronics (02) 9554 9760. Fax: 9718 4762. Email: skybus<at>zip.com.au MICROCRAFT IS NOW ON THE WEB: Dunfield (DDS) products are now available ex-stock at a new low price; please ask for our catalogue. Micro C, the affordable “C” compiler for embedded applications. Versions for 8051/52, 8086, 8096, 68HC08, 6809, 68HC11 or 68HC16 $139.95 each + $3 p&h • EMILY52 is a PC based 8051/52 high speed simulator $69.95 + $3 p&h • DDS demo disks $7 + $3 p&h • VHS VIDEO from the USA (PAL) “CNC X-Y-Z using car alter­nators” (uses car alternators as cheap power stepper motors!) $49.95 + $6 p&h (includes diagrams) • Fixed price electronic design and PCB layout • Credit cards accepted • All goods sent registered mail • Call Bob for more de­ t ails. MICRO­CRAFT, PO Box 514, Concord NSW 2137. Phone (02) 9744 5440 or fax (02) 9744 9280. http://www.micro.com.au email sales<at>micro.com.au $79 ! VIDEO CAMERA MODULES ! $79 ONLY! $79 !!!!! ONLY! $79 !!!!! Complete with 3.6 mm Board or 5 mm Pinhole Lens, Low Light & Infra Red Sensitive, Tiny 32 x 32 mm PCB. Cat No MOD-BW 506 ONLY! $79!!!!! Allthings Sales & Services 08 9349 9413, fax 08 9344 5905. CAR/RALLY COMPUTER KIT: including fuel sensor & speed sensor. 68HC05 & HC11 DEVELOPMENT SYSTEMS: Oztechnics, PO Box 38, Illawong NSW 2234. Phone (02) 9541 0310. Fax (02) 9541 0734. http://www.oz­technics.com.au/ Video Audio TX/RX Modules UP TO 100 M RANGE, 915-928 MHz band, $80 pair, with Interface PCBs $99. Allthings Sales & Services 08 9349 9413, fax 08 9344 5905. Microprocessor For Digital Effects Unit This is the 68HC705-C8P pro­ gramm­ed micro­pro­cessor IC for the Digital Effects Unit (see Feb­. 1995). Price: $45 + $6 p+p Payment by cheque, money order or credit card to: Silicon Chip Pub­ lica­ tions, PO Box 139 Collaroy 2097. Phone (02) 9979 5644; Fax (02) 9979 6503. MicroZed Computers PO Box 634, ARMIDALE 2350 (296 Cook’s Rd) Ph (067) 722777 – may time out to Mobile 014 036775 Fax (067) 728987    (Credit Cards OK) http://www.microzed.com.au/~microzed BASIC STAMPS & PIC Tools With third party supporting products, all in stock Easy to learn, easy to use sophisticated CPU based controllers Credit cards OK   Send two 45c stamps for info MEMORY * MEMORY * MEMORY LIFETIME WARRANTY!! 651 Forest Rd, Bexley 2207 makes all the project PCBs published in SILICON CHIP and other Australian magazines Tel +61 2 9587 3491 Fax 9587 5385 E-mail rcsradio<at>cia.com.au RAIN BRAIN AND DIGI-TEMP KITS: 8-station controller and 8-chan­ n el, RS232 digital thermometer uses the incredible DS1820 sensor. Call Mantis Micro Products, 38 Garnet St, Niddrie, 3042. P/F/A (03) 9337 1917. http://www.home.aone.net.au/mantismp SIMMS (Parity/No Parity) 4Mb 30 PIN-70 $50 $38 4Mb 72 PIN-70 $53 $36 8Mb 72 PIN-70 $94 $70 16Mb 72 PIN-70 $160 $125 32Mb 72 PIN-70 $298 $285 EDO SIMMS (60ns) 4Mb/8Mb $36/70 16Mb/32Mb $128/252 64Mb/128Mb $1066/2112 DIMMS 8Mb/16Mb - 168 PIN $70/144 32Mb/64Mb - 168 PIN $306/570 SYNCHRONOUS (SDRAM) 168 PIN - 16Mb $144 168 PIN - 32Mb $281 168 PIN - 64Mb $676 LASER PRINTER MEMORY 4Mb HP 4&5 8Mb HP 4 & 5 All other models available COMPAQ 16Mb ARMADA 1100 All other models available TOSHIBA 16Mb Tecra 500/610 Sat All other models available IBM 16Mb T.Pad 755, 360 EDO All other models available $42 $83 $Call $215 $Call $218 $Call $244 $Call ALSO AVAILABLE: ACER, DELL, GATEWAY 2000, AST, CANON, NEC, ZENITH & MANY MORE Ex Tax Pricing – Delivery $8. Pricing as at 05/05/97. Phone for latest. Sales Tax 22%. Credit Cards Welcome. We Also Buy And Trade-In Memory. PELHAM PTY LTD Suite 6, 2 Hillcrest Rd, Ph: (02) 9980 6988 Pennant Hills, 2120. Fax: (02) 9980 6991 Email: pelham1<at>ozemail.com.au TV SATELLITE DISHES: international reception of Intelsat, Panamsat, Gori­ zont,Rimsat. Warehouse Sale – 4.6m dish & pole $1499; LNB $50; Feed $75. All accessories available. Videosat, 2/28 Salisbury Rd, Hornsby. Phone (02) 9482 3100 8.30-5.00 M-F SILICON CHIP FLOPPY INDEX WITH FILE VIEWER Now available: the complete index to all SILICON CHIP articles since the first issue in November 1987. The Floppy Index comes with a handy file viewer that lets you look at the index line by line or page by page for quick browsing, or you can use the search function. All commands are listed on the screen, so you’ll always know what to do next. Notes & Errata also now available: this file lets you quickly check out the Notes & Errata (if any) for all articles published in SILICON CHIP. Not an index but a complete copy of all Notes & Errata text (diagrams not included). The file viewer is included in the price, so that you can quickly locate the item of interest. The Floppy Index and Notes & Errata files are supplied in ASCII format on a 3.5-inch or 5.25-inch floppy disc to suit PC-compatible computers. Note: the File Viewer requires MSDOS 3.3 or above. Price $7.00 each + $3 p&p. Send your order to: Silicon Chip Publications, PO Box 139, Collaroy 2097; or phone (02) 979 5644 & quote your credit card number; or fax the details to (02) 979 6503. Please specify 3.5-inch or 5.25-inch disc. June 1997  95 * THE TINIEST * VIDEO CAMERA MODULE PCB 28 x 28 mm, IR & Low light sensitive, with Pinhole Lens. 08 9349 9413. SILICON CHIP FOR SALE. First 110 from Vol 1 No 1. $220 job lot. Roberts, 116 Lamonerie Street, Toongabbie NSW 2146. Phone (02) 9631 5584. INFRA RED ILLUMINATORS 240 vac Auto on/off in Aluminium Housing with Adj Bracket $149. PCB with LEDs $79. PCB with LEDs AND Auto Control PCB $99. DIY LED & PCB Kits: 50 LED 52mm Round Lamp $50. 88 LED $72. 180 LED $113. Variations include up to 210 LED 34 watt. Allthings Sales & Services 08 9349 9413, fax 08 9344 5905. MicroZed have STAMP VER 1.8 handbook $30 + $p&p. Has 80 pages. BS1 -> BS2 conversion data. Circuit Ideas Wanted Do you have a good circuit idea. If so, why not sketch it out, write a brief description of its operation & send it to us. Provided your idea is workable & original, we’ll publish it in Circuit Notebook & you’ll make some money. We’ll pay up to $60 for a really good circuit but don’t make them too big please. Send your idea to: Silicon Chip Publications, PO Box 139, Collaroy, NSW 2097. Advertising Index Altronics................................. 34-36 Av-Comm.....................................21 Dick Smith Electronics..... 8-9,24-25 Earthquake Audio........................89 Emona.........................................73 Freedman Electronics..................89 Harbuch Electronics....................89 Instant PCBs................................95 Jaycar ............................IFC, 45-52 Kalex............................................59 Kits-R-US.....................................88 14 Model Railway Projects Shop soiled but HALF PRICE! Our stocks of this book are now limited. All we have left are newsagents’ returns which means that they may be slightly shop soiled or have minor cover blemishes. Otherwise, they're undamaged and in good condition. SPECIAL CLEARANCE PRICE: $3.95 + $3 P&P (Aust. & NZ) Macservice....................................3 MicroZed Computers...................95 Model Railways Book..................96 Oatley Electronics........................31 Pelham.........................................95 RCS Radio...................................95 Rod Irving Electronics .......... 81-85 Silicon Chip Back Issues....... 38-39 Silicon Chip Bookshop.................93 Silicon Chip Binders................OBC Silicon Chip Software....................7 This book will not be reprinted Silicon Chip Wallchart..............OBC Yes! Please send me _____ copies of 14 Model Railway Projects at the special price of $A3.95 + $A3 p&p (p&p outside Aust. & NZ $A6). Enclosed is my cheque/money order for $­A__________ or please debit my Telstra..........................................87 ❏ Bankcard   ❏  Visa Card   ❏ MasterCard Zoom Magazine.........................IBC _____________________________ Card No. Signature­­­­­­­­­­­­___________________________  Card expiry date______/______ Name Street Tortech.........................................59 ______________________________________________________ PLEASE PRINT ______________________________________________________ Suburb/town_________________________________ Postcode_________ Send your order to: SILICON CHIP, PO Box 139, Collaroy, NSW 2097; or fax your order to (02) 9979 6503; or ring (02) 9979 5644 and quote your credit card number (Bankcard, Visa Card or MasterCard). 96  Silicon Chip PC Boards Printed circuit boards for SILICON CHIP projects are made by: •  RCS Radio Pty Ltd, 651 Forest Rd, Bexley, NSW 2207. Phone (02) 9587 3491. •  Marday Services, PO Box 19-189, Avondale, Auckland, NZ. Phone (09) 828 5730.