Silicon ChipContents - July 2011 SILICON CHIP
  1. Outer Front Cover
  2. Contents
  3. Publisher's Letter: The quest for ultra-low distortion
  4. Feature: Australia Hears . . . And So Do I by Ross Tester
  5. Feature: Control Your World Using Linux by Nenad Stojadinovic
  6. Book Store
  7. Project: Ultra-LD Mk.3 200W Amplifier Module by Nicholas Vinen
  8. Project: A Portable Lightning Detector by John Clarke
  9. Project: Rudder Position Indicator For Power Boats by Nicholas Vinen
  10. Feature: A Look At Amplifier Stability & Compensation by Nicholas Vinen
  11. Project: Build A Voice-Activated Relay (VOX) by John Clarke
  12. Vintage Radio: Hotpoint Bandmaster J35DE console radio, Pt.1 by Maurie Findlay
  13. Advertising Index
  14. Outer Back Cover

This is only a preview of the July 2011 issue of Silicon Chip.

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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)
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  • 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)
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  • 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)
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  • Computer Bits (October 1993)
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  • Computer Bits (March 1994)
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  • Computer Bits (January 1995)
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  • Computer Bits (March 1995)
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  • 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)
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  • 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)
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  • 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 "Ultra-LD Mk.3 200W Amplifier Module":
  • Ultra-LD Mk3 200W Amplifier Module PCB [01107111] (AUD $15.00)
  • Ultra-LD Mk3/Mk4 Amplifier Power Supply PCB [01109111] (AUD $15.00)
  • Ultra-LD Mk.3 Power Supply PCB pattern (PDF download) [01109111] (Free)
Articles in this series:
  • Ultra-LD Mk.3 200W Amplifier Module (July 2011)
  • Ultra-LD Mk.3 200W Amplifier Module (July 2011)
  • Ultra-LD Mk.3 200W Amplifier Module, Pt.2 (August 2011)
  • Ultra-LD Mk.3 200W Amplifier Module, Pt.2 (August 2011)
  • Ultra-LD Mk.3 200W Amplifier Module, Pt.3 (September 2011)
  • Ultra-LD Mk.3 200W Amplifier Module, Pt.3 (September 2011)
Items relevant to "A Portable Lightning Detector":
  • Portable Lightning Detector PCB [04107111] (AUD $15.00)
  • Portable Lightning Detector PCB pattern (PDF download) [04107111] (Free)
  • Portable Lightning Detector front and top panel artwork (PDF download) (Free)
Items relevant to "Rudder Position Indicator For Power Boats":
  • Rudder Position Indicator PCB Set [20107111/2/3/4] (AUD $80.00)
  • ATtiny861 programmed for the Rudder Position Indicator Sensor/Transmitter [2010711A.HEX] (Programmed Microcontroller, AUD $15.00)
  • ATtiny861 programmed for the Rudder Position Indicator Receiver/Display [2010711B.HEX] (Programmed Microcontroller, AUD $15.00)
  • Firmware (HEX) files and C source code for the Rudder Position Indicator [2010711A/B] (Software, Free)
  • Rudder Position Indictor PCB patterns (PDF download) [20107111/2/3/4] (Free)
Articles in this series:
  • Rudder Position Indicator For Power Boats (July 2011)
  • Rudder Position Indicator For Power Boats (July 2011)
  • Rudder Position Indicator For Power Boats, Pt.2 (August 2011)
  • Rudder Position Indicator For Power Boats, Pt.2 (August 2011)
Items relevant to "A Look At Amplifier Stability & Compensation":
  • SPICE simulation data for Amplifier Stability & Compensation article (Software, Free)
Items relevant to "Build A Voice-Activated Relay (VOX)":
  • VOX PCB [01207111] (AUD $15.00)
  • VOX (Voice Activated Relay) PCB pattern (PDF download) [01207111] (Free)

Purchase a printed copy of this issue for $10.00.
Contents SILICON CHIP www.siliconchip.com.au Vol.24, No.7; July 2011 Features 14 Australia Hears . . . And So Do I New digital hearing aids developed in Australia are now available for a fraction of the cost of other aids. You can even program them yourself – by Ross Tester 21 Could There Be A SIM-LEI Electric Car In Your Future? The evolution of electric cars continues. This one has in-wheel motors, does 0-100km/h in just 4.8s and has a range of 300km plus – by Ross Tester 22 Control Your World Using Linux PCs running Linux are quite open to the experimenter. Here’s how to use your computer to control external equipment – by Nenad Stojadinovic 72 A Look At Amplifier Stability & Compensation Ultra-LD Mk.3 200W Amplifier Module – Page 30. Portable Lightning Detector – Page 42. The Ultra-LD Mk3 amplifier described in this issue has a new frequency compensation arrangement to lower distortion. We explain why amplifier frequency compensation is necessary and how it works – by Nicholas Vinen Pro jects To Build 30 Ultra-LD Mk.3 200W Amplifier Module Upgraded design has even lower distortion than before. It also boasts much improved thermal stability, has a flatter frequency response and can deliver 135W RMS into 8Ω or 200W RMS into 4Ω – by Nicholas Vinen 42 A Portable Lightning Detector This device could literally save your life. It gives advance warning of approaching thunderstorms, giving you time to take shelter if out in the open or to disconnect valuable gear from the mains if at home – by John Clarke 62 Rudder Position Indicator For Power Boats Easy-to-build unit senses the rudder position and sends the information to a companion receiver unit via a 433MHz RF link – by Nicholas Vinen 82 Build A Voice-Activated Relay (VOX) Turn devices on or off by speaking (or by using some other sound) with this simple VOX circuit. It features adjustable sensitivity and delay– by John Clarke Special Columns 57 Serviceman’s Log Restarting after the Christchurch earthquake – by the Serviceman 87 Circuit Notebook (1) Surf Sound Synthesiser; (2) Geiger Counter Uses Cockroft-Walton Multiplier; (3) PICAXEL The Electronic Cricket; (4) Wein Bridge Oscillator Uses An LM386 Power Amplifier; (5) Synthetic 5-Segment Potentiometer Rudder Position Indicator For Power Boats – Page 62. 62. 92 Vintage Radio Hotpoint Bandmaster J35DE console radio, Pt.1 – by Maurie Findlay Departments   2   4 40 98 Publisher’s Letter Mailbag Product Showcase Ask Silicon Chip siliconchip.com.au 101 Notes & Errata 102 Order Form 103 Market Centre Build A Voice-Activated Relay – Page 82. July 2011  1