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Contents Vol.35, No.6 June 2022 12 IC Fabrication, Part 1 0,', 63(&75$/6281' We take an in-depth look at how silicon chips, also known as integrated circuits, are made. ICs form the lifeblood of most modern technology, from computers to medical devices. By Dr David Maddison Semiconductors 6<17+(6,6(5 SDJH 38 Radar Coach Speed Detector The Radar Coach is ideal for measuring the speed of cricket, baseball and footballs. It can also be used to measure your own sprint, or even a car! By Allan Linton-Smith Speed detector review page 40 72 MOS Air Quality Sensors MOS (metal oxide semiconductor) modules are air quality sensors that rely on the behaviour of metal oxide in the presence of air to measure gas levels. By Jim Rowe Low-cost electronic modules 84 Altium Designer 22 We use Altium Designer for all our project PCBs and so with the release of AD22, we wanted to see what new features are available. By Tim Blythman Software review 24 Spectral Sound MIDI Synthesiser The Spectral Sound MIDI Synth is easy to build and can be connected to any MIDI compatible device. It can play up to 18 different notes simultaneously, providing you with a device that can create rich and detailed sounds. By Jeremy Leach Musical instrument project 40 Buck-Boost LED Driver This high-power project drives ridiculously bright 12V LED panels. It delivers up to 8A with adjustable current and voltage. You can even use it to charge batteries from a DC source, or as a 12 ↔ 24V DC converter. By Tim Blythman LED/regulator project 48 Arduino Programmable Load A variable load is indispensible when testing power supplies, driver circuits and the like. Our Arduino shield can handle up to 70W continuous at 15V and 4.7A, with a load resistance between 3.1W and 47W in 15 steps. By Tim Blythman Arduino project 61 500W Power Amplifier, Part 3 Follow these assembly, testing and calibration instructions to finish building the 500W Power Amplifier. By John Clarke Audio project 81 Revised Battery Charge Controller Due to the unavailability of the Si8751 Mosfet driver, we have redesigned our 2019 Universal Battery Charge Controller to use alternative parts. By John Clarke Project update Buck-Boost LED Driver Altium Designer 22 review on page 84 2 Editorial Viewpoint 4 Mailbag 88 Circuit Notebook 92 Serviceman’s Log 98 Vintage Television 1. RF burst power meter 2. Artificial candle using a “real” flame 3. Digital volume control with discrete logic 4. An easy way to measure SMDs Admiral 19A11S TV by Dr Hugo Holden 106 Online Shop 108 Ask Silicon Chip 111 Market Centre 112 Advertising Index