Silicon ChipContents - July 1992 SILICON CHIP
  1. Outer Front Cover
  2. Contents
  3. Publisher's Letter: When will domestic appliances be quiet?
  4. Vintage Radio: Unusual problems lead to interesting repairs by John Hill
  5. Feature: Understanding The World Of CB Radio by Herb Zallner
  6. Project: Build A Nicad Battery Discharger by Marque Crozman
  7. Project: 8-Station Automatic Sprinkler Timer by Graham Blowes
  8. Serviceman's Log: How do you get to blast a ghetto by The TV Serviceman
  9. Order Form
  10. Project: Portable 12V SLA Battery Charger by Darren Yates
  11. Project: An Off-Hook Timer For Telephones by Darren Yates
  12. Feature: Computer Bits by Paul Lynch
  13. Feature: Amateur Radio by Garry Cratt VK2YBX
  14. Project: Multi-Station Headset Intercom; Pt.2 by Marque Crozman
  15. Feature: Electronics Workbench For Home Or Lab by Leo Simpson
  16. Market Centre
  17. Advertising Index
  18. Outer Back Cover

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

You can view 48 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 Nicad Battery Discharger":
  • Silicon Chip article scan, July 1992 - Nicad Battery Discharger (AUD $10.00)
Items relevant to "Portable 12V SLA Battery Charger":
  • Silicon Chip article scan, July 1992 - Portable 12-Volt SLA Battery Charger (AUD $10.00)
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)
Items relevant to "Multi-Station Headset Intercom; Pt.2":
  • Multi-Station Headset Intercom PCB [01302921] (AUD $7.50)
  • Multi-station Headset Intercom PCB pattern (PDF download) [01302921] (Free)
  • Silicon Chip article scan, July 1992 - Multi-Station Headset Intercom Pt2 (AUD $10.00)
Articles in this series:
  • Multi-Station Headset Intercom; Pt.1 (June 1992)
  • Multi-Station Headset Intercom; Pt.2 (July 1992)
Vo/.5, No.7. July 1992 FEATURES 16 Understanding The World Of CB Radio by Herb Zallner The background, the frequencies & the gear 82 Electronics Workbench For Home Or Lab by Leo Simpson ARE YOU HAVING battery problems with your hand-held telephone? This simple device will correctly discharge a nicad battery pack so that it can then be recharged to full capacity. Details page 22 Build it & clean up your work practices 4!i PROJECTS TO BUILD Eight Stal.ion Sprinkler Controller ~JI :' 22 Build A Nicad Battery Discharger by Marque Crozman Rids your batteries of the dreaded memory effect 30 8-Station Automatic Sprinkler Timer by Graham Blowes It can also control lights & other appliances 54 Portable 12V SLA Battery Charger by Darren Yates Recharge 12V SLA batteries from your car's lighter socket 64 An Off-Hook Timer For Telephones by Darren Yates Takes the phone off-hook & then replaces it after a preset time 76 Multi-Station Headset Intercom, Pt.2 by Marque Crozman Second article completes the construction details SPECIAL COLUMNS 6 Vintage Radio by John Hill Unusual problems lead to interesting repairs TAKE THE DRUDGERY out of watering your garden with this automatic 8-station sprinkler timer. It can also be used to control lights or other appliances. See page 30 40 Serviceman's Log by the TV Serviceman How do you get to blast a ghetto? 70 Computer Bits by Paul Lynch Good books on the PC can be well worthwhile 72 Amateur Radio by Garry Crutt PORTA8l!;; 12V SI.A BATTERY CHARGER Radiation hazards - the precautions you should take DEPARTMENTS 2 Publisher's Letter 4 Mailbag 53 Order Form 58 Circuit Notebook 74 Back Issues 85 Product Showcase 92 Ask Silicon Chip 93 Notes & Errata 94 Market Centre 96 Advertising Index YOU CAN USE THIS simple project to recharge 12V sealed lead acid batteries via your car's cigarette lighter socket. We show you how to build it starting page 54. JULY 1992 1