Silicon ChipContents - February 1994 SILICON CHIP
  1. Outer Front Cover
  2. Contents
  3. Publisher's Letter: Energy consumption taking the long view
  4. Feature: Airbags: More Than Just Bags Of Wind by Julian Edgar
  5. Book Store
  6. Feature: Data On The ISD2590P Voice Recorder IC by Darren Yates
  7. Project: Build A 90-Second Message Recorder by Darren Yates
  8. Feature: Instrumentation Programming The Graphical Way by Jack Barber
  9. Project: Compact & Efficient 12-240VAC 200W Inverter by John Clarke
  10. Feature: Electronic Engine Management; Pt.5 by Julian Edgar
  11. Project: A Single Chip Audio Amplifier by Darren Yates
  12. Serviceman's Log: If only the fault would show by The TV Serviceman
  13. Feature: Amateur Radio by Garry Cratt, VK2YBX
  14. Project: Build A Novel LED Torch by John Clarke
  15. Order Form
  16. Project: 40V 3A Variable Power Supply; Pt.2 by John Clarke
  17. Feature: Computer Bits by Darren Yates
  18. Vintage Radio: Building a simple 1-valve receiver by John Hill
  19. Product Showcase
  20. Back Issues
  21. Market Centre
  22. Advertising Index
  23. Outer Back Cover

This is only a preview of the February 1994 issue of Silicon Chip.

You can view 30 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 "Build A 90-Second Message Recorder":
  • 90 Second Message Recorder PCB pattern (PDF download) [01202941] (Free)
Items relevant to "Compact & Efficient 12-240VAC 200W Inverter":
  • 200W 12V DC to 240VAC Inverter PCB pattern (PDF download) [11309931] (Free)
Articles in this series:
  • Electronic Engine Management; Pt.1 (October 1993)
  • Electronic Engine Management; Pt.2 (November 1993)
  • Electronic Engine Management; Pt.3 (December 1993)
  • Electronic Engine Management; Pt.4 (January 1994)
  • Electronic Engine Management; Pt.5 (February 1994)
  • Electronic Engine Management; Pt.6 (March 1994)
  • Electronic Engine Management; Pt.7 (April 1994)
  • Electronic Engine Management; Pt.8 (May 1994)
  • Electronic Engine Management; Pt.9 (June 1994)
  • Electronic Engine Management; Pt.10 (July 1994)
  • Electronic Engine Management; Pt.11 (August 1994)
  • Electronic Engine Management; Pt.12 (September 1994)
  • Electronic Engine Management; Pt.13 (October 1994)
Items relevant to "A Single Chip Audio Amplifier":
  • Champ: Single Chip Audio Amplifier PCB [01102941] (AUD $5.00)
  • The Champ PCB pattern (PDF download) [01102941] (Free)
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)
Items relevant to "Build A Novel LED Torch":
  • Simple LED Torch PCB pattern (PDF download) [08302941] (Free)
Items relevant to "40V 3A Variable Power Supply; Pt.2":
  • Silicon Chip article scan, February 1994 - 40V 3A Variable Power Supply, Pt.2 (AUD $10.00)
  • Silicon Chip article scan, January 1994 - 40V 3A Variable Power Supply, Pt.1 (AUD $10.00)
  • 40V 3A Variable Power Supply PCB pattern (PDF download) [04202941] (Free)
  • Silicon Chip article scan, February 1994 - 40V 3A Variable Power Supply, Pt.2 (AUD $10.00)
Articles in this series:
  • 40V 3A Variable Power Supply; Pt.1 (January 1994)
  • 40V 3A Variable Power Supply; Pt.2 (February 1994)
Items relevant to "Computer Bits":
  • Games Card Breakout PCB [07103941] (PCB Pattern, Free)
  • DOS software for Computer Bits, November 1993 & January/February 1994 (Free)
Articles in this series:
  • Experiments For Your Games Card (January 1992)
  • Computer Bits (November 1993)
  • Computer Bits (January 1994)
  • Computer Bits (February 1994)
  • Computer Bits (April 1994)
Vol.7, No.2; February 1994 FEATURES FEATURES   4 Airbags: More Than Just Bags Of Wind by Julian Edgar AIRBAGS ARE MORE than just bags of wind that operate on a hit or miss basis. Our article on page 4 explains how they work. Find out how they work 10 Data On The ISD2590P Voice Recorder IC by Darren Yates New chip has up to 90 seconds playback time 22 Instrumentation Programming The Graphical Way by Jack Barber Graphical programming using LabVIEW 42 Electronic Engine Management, Pt.5 by Julian Edgar The oxygen sensor – how it works PROJECTS PROJECTS TO TO BUILD BUILD 16 Build A 90-Second Message Recorder by Darren Yates THIS 90-SECOND MESSAGE recorder is based on a special IC & features a pause button, zero-power memory retention & battery operation. Construction starts on page 16. Features a pause button & zero-power memory storage 26 Compact & Efficient 12-240VAC 200W Inverter by John Clarke New switching design has low stand-by current 46 A Single Chip Audio Amplifier by Darren Yates Compact design delivers 0.5W into eight ohms 58 Build A Novel LED Torch by John Clarke Uses a high-brightness amber LED for low battery drain 66 40V 3A Variable Power Supply, Pt.2 by John Clarke Construction, test & adjustment SPECIAL SPECIAL COLUMNS COLUMNS FEATURING A HIGHLY efficient switching circuit, this compact 12-240VAC inverter can drive most mains appliances, including TVs, computers, power tools & fluorescent lights. See page 26. 50 Serviceman’s Log by the TV Serviceman If only the fault would show 56 Amateur Radio by Garry Cratt, VK2YBX Convert an inexpensive walkie-talkie to the 6-metre band 79 Computer Bits by Darren Yates Experiments for your games card, Pt.4 82 Vintage Radio by John Hill Building a simple 1-valve receiver DEPARTMENTS DEPARTMENTS   2 20 65 87 Publisher’s Letter Circuit Notebook Order Form Product Showcase 90 92 95 96 Back Issues Ask Silicon Chip Market Centre Advertising Index THE OXYGEN SENSOR is a vital component in your car’s engine management system. Find out what it does & how it works by turning to page 42. Cover design: Marque Crozman February 1994  1