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Contents Vol.35, No.2 February 2022 11 Book Review: Radio Girl 24 David Dufty’s book is a biography of Violet McKenzie, Australia’s first female engineer and one of the founders of Wireless Weekly magazine. That magazine was eventually renamed to “Electronics Australia”. By Nicholas Vinen Review 12 All About Batteries – Part 2 The second article in our series on batteries covers upcoming technologies being researched, as well as detailing the ‘tried and true’ lead-acid battery and some other unusual battery types. By Dr David Maddison Science 44 41 Low-noise HF-UHF Amplifiers These three wideband HF-UHF amplifier modules are said to provide 20dB of gain with frequency ranges of 1MHz-3GHz, 5MHz-6GHz and 50MHz4GHz respectively. By Jim Rowe Low-cost electronic modules 70 70 TL866II Universal Programmer The TL866II can program over 16,000 parts, including many of the popular Atmel and Microchip microcontrollers. It is relatively inexpensive and will even program PLDs (programmable logic devices). By Tim Blythman Review 24 Dual Hybrid Power Supply – Pt1 This Supply has two separate outputs, which can deliver up to 25V DC at 5A. They can be connected in series and ganged up to form a dual-tracking supply. It uses an LCD screen, and rotary encoders/pushbuttons for control. By Phil Prosser Power supply project 44 Fan Controller & Loudspeaker Protector Controlling up to three fans, switching them on at preset temperatures and adjusting their speed via PWM is only part of what this project does. It also functions as a loudspeaker protector for mono or stereo amplifiers. By John Clarke Audio project 62 Solid-State Tesla Coil By generating extremely high voltages, this Tesla Coil will form a ‘flame’ discharge using only discrete components, making it easy to assemble and perfect to show off to your friends. By Flavio Spedalieri Home science project 76 Remote Gate Controller If the controller for your sliding or swinging electric gate fails, replace it with this very reliable Gate Controller. It can be triggered remotely or via a local button, and it even stops the gate if it encounters an obstacle. By Dr Hugo Holden Remote control project 2 Editorial Viewpoint 4 Mailbag 6 Subscriptions 61 Product Showcase 85 Serviceman’s Log 92 Vintage Radio 101 Tasma 305 ‘rat radio’ by Fred Lever Online Shop 102 Circuit Notebook 108 Ask Silicon Chip 1. Resistor-Mite auto-ranging ohmmeter 2. A capacitive soil moisture meter 3. Musical bicycle horn 111 Market Centre 112 Advertising Index