Silicon ChipRadio Girl - February 2022 SILICON CHIP
  1. Outer Front Cover
  2. Contents
  3. Publisher's Letter: Be wary of devices that require apps to work
  4. Subscriptions
  5. Review: Radio Girl by Nicholas Vinen
  6. Feature: All About Batteries – Part 2 by Dr David Maddison
  7. Project: Dual Hybrid Power Supply – Pt1 by Phil Prosser
  8. Feature: Low-noise HF-UHF Amplifiers by Jim Rowe
  9. Project: Fan Controller & Loudspeaker Protector by John Clarke
  10. Product Showcase
  11. Project: Solid-State Tesla Coil by Flavio Spedalieri
  12. Review: TL866II Universal Programmer by Tim Blythman
  13. Project: Remote Gate Controller by Dr Hugo Holden
  14. Serviceman's Log: The accordion job by Dave Thompson
  15. Vintage Radio: Tasma 305 'rat radio' by Fred Lever
  16. PartShop
  17. Market Centre
  18. Advertising Index
  19. Outer Back Cover

This is only a preview of the February 2022 issue of Silicon Chip.

You can view 35 of the 112 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.

Articles in this series:
  • All About Batteries - Part 1 (January 2022)
  • All About Batteries - Part 1 (January 2022)
  • All About Batteries – Part 2 (February 2022)
  • All About Batteries – Part 2 (February 2022)
  • All About Batteries, part three (March 2022)
  • All About Batteries, part three (March 2022)
Items relevant to "Dual Hybrid Power Supply – Pt1":
  • Intelligent Dual Hybrid Power Supply PCB set (AUD $25.00)
  • Intelligent Dual Hybrid Power Supply regulator PCB [18107211] (AUD $7.50)
  • Intelligent Dual Hybrid Power Supply front panel control PCB [18107212] (AUD $2.50)
  • DSP Crossover CPU PCB [01106193] (AUD $5.00)
  • DSP Crossover LCD Adaptor PCB [01106196] (AUD $2.50)
  • PIC32MZ2048EFH064-250I/PT programmed for the Intelligent Dual Hybrid Power Supply [0110619A.HEX] (Programmed Microcontroller, AUD $30.00)
  • 128x64 Blue LCD screen with KS0108-compatible controller (Component, AUD $30.00)
  • Hard-to-get parts for the Intelligent Dual Hybrid Power Supply regulator board (Component, AUD $100.00)
  • Hard-to-get parts for the Intelligent Dual Hybrid Power Supply CPU board (Component, AUD $60.00)
  • LCD panel bezel for the Dual Intelligent Hybrid Power Supply (PCB, AUD $5.00)
  • Intelligent Dual Hybrid Power Supply firmware [0110619A.HEX] (Software, Free)
  • Intelligent Dual Hybrid Power Supply PCB patterns [18107211/2] (Free)
  • DSP Active Crossover/DDS/Reflow Oven PCB patterns (PDF download) [01106191-6] (Free)
Articles in this series:
  • Dual Hybrid Power Supply – Pt1 (February 2022)
  • Dual Hybrid Power Supply – Pt1 (February 2022)
  • Dual Hybrid Power Supply, part two (March 2022)
  • Dual Hybrid Power Supply, part two (March 2022)
  • Intelligent Dual Hybrid Power Supply, part one (June 2025)
  • Intelligent Dual Hybrid Power Supply, part one (June 2025)
Articles in this series:
  • El Cheapo Modules From Asia - Part 1 (October 2016)
  • El Cheapo Modules From Asia - Part 1 (October 2016)
  • El Cheapo Modules From Asia - Part 2 (December 2016)
  • El Cheapo Modules From Asia - Part 2 (December 2016)
  • El Cheapo Modules From Asia - Part 3 (January 2017)
  • El Cheapo Modules From Asia - Part 3 (January 2017)
  • El Cheapo Modules from Asia - Part 4 (February 2017)
  • El Cheapo Modules from Asia - Part 4 (February 2017)
  • El Cheapo Modules, Part 5: LCD module with I²C (March 2017)
  • El Cheapo Modules, Part 5: LCD module with I²C (March 2017)
  • El Cheapo Modules, Part 6: Direct Digital Synthesiser (April 2017)
  • El Cheapo Modules, Part 6: Direct Digital Synthesiser (April 2017)
  • El Cheapo Modules, Part 7: LED Matrix displays (June 2017)
  • El Cheapo Modules, Part 7: LED Matrix displays (June 2017)
  • El Cheapo Modules: Li-ion & LiPo Chargers (August 2017)
  • El Cheapo Modules: Li-ion & LiPo Chargers (August 2017)
  • El Cheapo modules Part 9: AD9850 DDS module (September 2017)
  • El Cheapo modules Part 9: AD9850 DDS module (September 2017)
  • El Cheapo Modules Part 10: GPS receivers (October 2017)
  • El Cheapo Modules Part 10: GPS receivers (October 2017)
  • El Cheapo Modules 11: Pressure/Temperature Sensors (December 2017)
  • El Cheapo Modules 11: Pressure/Temperature Sensors (December 2017)
  • El Cheapo Modules 12: 2.4GHz Wireless Data Modules (January 2018)
  • El Cheapo Modules 12: 2.4GHz Wireless Data Modules (January 2018)
  • El Cheapo Modules 13: sensing motion and moisture (February 2018)
  • El Cheapo Modules 13: sensing motion and moisture (February 2018)
  • El Cheapo Modules 14: Logarithmic RF Detector (March 2018)
  • El Cheapo Modules 14: Logarithmic RF Detector (March 2018)
  • El Cheapo Modules 16: 35-4400MHz frequency generator (May 2018)
  • El Cheapo Modules 16: 35-4400MHz frequency generator (May 2018)
  • El Cheapo Modules 17: 4GHz digital attenuator (June 2018)
  • El Cheapo Modules 17: 4GHz digital attenuator (June 2018)
  • El Cheapo: 500MHz frequency counter and preamp (July 2018)
  • El Cheapo: 500MHz frequency counter and preamp (July 2018)
  • El Cheapo modules Part 19 – Arduino NFC Shield (September 2018)
  • El Cheapo modules Part 19 – Arduino NFC Shield (September 2018)
  • El cheapo modules, part 20: two tiny compass modules (November 2018)
  • El cheapo modules, part 20: two tiny compass modules (November 2018)
  • El cheapo modules, part 21: stamp-sized audio player (December 2018)
  • El cheapo modules, part 21: stamp-sized audio player (December 2018)
  • El Cheapo Modules 22: Stepper Motor Drivers (February 2019)
  • El Cheapo Modules 22: Stepper Motor Drivers (February 2019)
  • El Cheapo Modules 23: Galvanic Skin Response (March 2019)
  • El Cheapo Modules 23: Galvanic Skin Response (March 2019)
  • El Cheapo Modules: Class D amplifier modules (May 2019)
  • El Cheapo Modules: Class D amplifier modules (May 2019)
  • El Cheapo Modules: Long Range (LoRa) Transceivers (June 2019)
  • El Cheapo Modules: Long Range (LoRa) Transceivers (June 2019)
  • El Cheapo Modules: AD584 Precision Voltage References (July 2019)
  • El Cheapo Modules: AD584 Precision Voltage References (July 2019)
  • Three I-O Expanders to give you more control! (November 2019)
  • Three I-O Expanders to give you more control! (November 2019)
  • El Cheapo modules: “Intelligent” 8x8 RGB LED Matrix (January 2020)
  • El Cheapo modules: “Intelligent” 8x8 RGB LED Matrix (January 2020)
  • El Cheapo modules: 8-channel USB Logic Analyser (February 2020)
  • El Cheapo modules: 8-channel USB Logic Analyser (February 2020)
  • New w-i-d-e-b-a-n-d RTL-SDR modules (May 2020)
  • New w-i-d-e-b-a-n-d RTL-SDR modules (May 2020)
  • New w-i-d-e-b-a-n-d RTL-SDR modules, Part 2 (June 2020)
  • New w-i-d-e-b-a-n-d RTL-SDR modules, Part 2 (June 2020)
  • El Cheapo Modules: Mini Digital Volt/Amp Panel Meters (December 2020)
  • El Cheapo Modules: Mini Digital Volt/Amp Panel Meters (December 2020)
  • El Cheapo Modules: Mini Digital AC Panel Meters (January 2021)
  • El Cheapo Modules: Mini Digital AC Panel Meters (January 2021)
  • El Cheapo Modules: LCR-T4 Digital Multi-Tester (February 2021)
  • El Cheapo Modules: LCR-T4 Digital Multi-Tester (February 2021)
  • El Cheapo Modules: USB-PD chargers (July 2021)
  • El Cheapo Modules: USB-PD chargers (July 2021)
  • El Cheapo Modules: USB-PD Triggers (August 2021)
  • El Cheapo Modules: USB-PD Triggers (August 2021)
  • El Cheapo Modules: 3.8GHz Digital Attenuator (October 2021)
  • El Cheapo Modules: 3.8GHz Digital Attenuator (October 2021)
  • El Cheapo Modules: 6GHz Digital Attenuator (November 2021)
  • El Cheapo Modules: 6GHz Digital Attenuator (November 2021)
  • El Cheapo Modules: 35MHz-4.4GHz Signal Generator (December 2021)
  • El Cheapo Modules: 35MHz-4.4GHz Signal Generator (December 2021)
  • El Cheapo Modules: LTDZ Spectrum Analyser (January 2022)
  • El Cheapo Modules: LTDZ Spectrum Analyser (January 2022)
  • Low-noise HF-UHF Amplifiers (February 2022)
  • Low-noise HF-UHF Amplifiers (February 2022)
  • A Gesture Recognition Module (March 2022)
  • A Gesture Recognition Module (March 2022)
  • Air Quality Sensors (May 2022)
  • Air Quality Sensors (May 2022)
  • MOS Air Quality Sensors (June 2022)
  • MOS Air Quality Sensors (June 2022)
  • PAS CO2 Air Quality Sensor (July 2022)
  • PAS CO2 Air Quality Sensor (July 2022)
  • Particulate Matter (PM) Sensors (November 2022)
  • Particulate Matter (PM) Sensors (November 2022)
  • Heart Rate Sensor Module (February 2023)
  • Heart Rate Sensor Module (February 2023)
  • UVM-30A UV Light Sensor (May 2023)
  • UVM-30A UV Light Sensor (May 2023)
  • VL6180X Rangefinding Module (July 2023)
  • VL6180X Rangefinding Module (July 2023)
  • pH Meter Module (September 2023)
  • pH Meter Module (September 2023)
  • 1.3in Monochrome OLED Display (October 2023)
  • 1.3in Monochrome OLED Display (October 2023)
  • 16-bit precision 4-input ADC (November 2023)
  • 16-bit precision 4-input ADC (November 2023)
  • 1-24V USB Power Supply (October 2024)
  • 1-24V USB Power Supply (October 2024)
  • 14-segment, 4-digit LED Display Modules (November 2024)
  • 0.91-inch OLED Screen (November 2024)
  • 0.91-inch OLED Screen (November 2024)
  • 14-segment, 4-digit LED Display Modules (November 2024)
  • The Quason VL6180X laser rangefinder module (January 2025)
  • TCS230 Colour Sensor (January 2025)
  • The Quason VL6180X laser rangefinder module (January 2025)
  • TCS230 Colour Sensor (January 2025)
  • Using Electronic Modules: 1-24V Adjustable USB Power Supply (February 2025)
  • Using Electronic Modules: 1-24V Adjustable USB Power Supply (February 2025)
Items relevant to "Fan Controller & Loudspeaker Protector":
  • 500W Amplifier Module PCB [01107021 RevD] (AUD $25.00)
  • Hard-to-get parts for the 500W Amplifier (Component, AUD $180.00-200.00)
  • Parts collection for the 500W Amplifier (Component, AUD $235.00-250.00)
  • 500W Amplifier Module PCB pattern (PDF download) [01107021] (Free)
  • Cooling Fan Controller & Loudspeaker Protector PCB [01102221] (AUD $5.00)
  • PIC16F1459-I/P programmed for the Cooling Fan Controller & Loudspeaker Protector [0110222A.HEX] (Programmed Microcontroller, AUD $10.00-15.00)
  • 4-pin PWM fan header (Component, AUD $1.20)
  • Cooling Fan Controller & Loudspeaker Protector firmware [0110222A.HEX] (Software, Free)
  • Cooling Fan Controller & Loudspeaker Protector PCB pattern (PDF download) [01111211] (Free)
Articles in this series:
  • Fan Controller & Loudspeaker Protector (February 2022)
  • Fan Controller & Loudspeaker Protector (February 2022)
  • Amplifier Clipping Indicator (March 2022)
  • Amplifier Clipping Indicator (March 2022)
  • 500W Power Amplifier, Part 1 (April 2022)
  • 500W Power Amplifier, Part 1 (April 2022)
  • 500W Power Amplifier, Part 2 (May 2022)
  • 500W Power Amplifier, Part 2 (May 2022)
  • 500W Power Amplifier, Part 3 (June 2022)
  • 500W Power Amplifier, Part 3 (June 2022)
Items relevant to "Solid-State Tesla Coil":
  • Solid State Tesla Coil driver PCBs [26102221-2] (AUD $7.50)
  • Solid State Tesla Coil driver PCB patterns (PDF download) [26102221-2] (Free)
Items relevant to "Remote Gate Controller":
  • Driveway Gate Controller PCB [11009121] (AUD $20.00)
  • Remote Gate Controller PCB pattern (PDF download) [11009121] (Free)

Purchase a printed copy of this issue for $11.50.

Radio Girl I n 2020, the now late Gary Johnston, owner of Jaycar Electronics, sent me this book along with a letter that reads, in part: I really loved the book and read it in one sitting. It really touches the history of hobby electronics and Amateur Radio in Australia. Mrs Mac as she was known was not only a technical person, she was an entrepreneur. She opened a hobby electronics shop and started Wireless Weekly – the precursor of “Radio & Hobbies” and [its later manifestations]. That’s a pretty resounding endorsement from Mr Johnston. His ex-Boss, Dick Smith, also clearly enjoyed it very much, based on his published comments. I regret not having time to read the book until recently. It is essentially a biography of Violet McKenzie, née Wallace, pieced together from historical documentation and interviews with her friends. David Dufty has done a good job of that. One aspect of this book that surprised me is that I thought it would concentrate more on the story surrounding how Violet became Australia’s first female engineer. I also wanted to read about how she started Wireless Weekly (along with three others), ran probably the first ‘hobbyist’ electronics store in Sydney and so on. It does describe those events, but it concentrates more on her role in the formation of the WRENS, among the first women allowed to serve in Australia’s armed forces. That is certainly interesting in its own right. In retrospect, it makes sense that there would be far more information available on that aspect of her life than her earlier (and less ‘official’) activities. Besides telling the story of this remarkable woman’s life, the book also contains lots of fascinating history. I was amazed by the contortions that went on in the first half of last century trying to justify why women should not be engineers, serve in the armed forces or (one gets the impression) even leave the kitchen. That is all in the past now, especially given the drive to get more women to take up “STEM” subjects (science, technology, engineering & mathematics) – coincidentally, a movement that Gary Johnston was part of. In Australia, this can arguably all be traced back to Violet, and her fascination with radios and electricity in general. I was a little disappointed to reach the end of the main part of the book after about 250 pages. Still, that’s understandable given that a limited amount of information is available, especially regarding the early years of Violet’s life, up to the 1930s. Perhaps a technical person perusing some very early copies of Wireless Weekly could have dug up some technical facts that would have spiced up the book for the more switched-on (ahem) readers. But while that would be interesting to me, I suppose it might turn casual readers off. Of the 250 pages in the main part of the book, about 150 are dedicated to the wartime period of 1940-1945 or so. That isn’t surprising given the momentous events that occurred. Still, I wish enough information were available for Mr Dufty to have written a bit more about those fascinating early years. I also note that the book doesn’t really contain any criticisms of Mrs McKenzie. I suppose you would not expect to hear many negatives in interviewing her friends and family, and perhaps there was very little about her not to like. But it does seem a little one-sided as surely, nobody is perfect. Having said that, I don’t want to cast any aspersions on anyone as I prefer to look at things on the bright side myself. siliconchip.com.au Book Review by Nicholas Vinen “The story of the extraordinary Mrs Mac, pioneering engineer and wartime legend” written by David Dufty. The book has extensive information regarding the sources used to piece Mrs Mac’s life story together. That undoubtedly makes it an excellent resource for anyone who wants to investigate further. So the bottom line is: should you read this book? It is well-written and well-researched. If you are into Amateur Radio, Vintage Radio or are interested in the history of electronics, I would say yes. Or perhaps you want to read a story about how one very clever woman overcame much resistance to live a life that we would take for granted these days. In that case, you would also enjoy it. In fact, if all you are looking for is an interesting but true story about a unique individual who became a pioneer, you could do far worse than to read this book. Most readers, young and old, would get something out of it. Radio Girl is published by Allen & Unwin with an RRP of $29.99 (softcover/paperback). It is sold by most book retailers, in-store and online, and is also available as an eBook. SC Australia's electronics magazine February 2022  11