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Contents Vol.38, No.03 March 2025 14 Prosthetic Limbs Page 28 Electronic replacement limbs can allow users to perform many of the same tasks as they could before, leading to a big increase in their quality of life. By Dr David Maddison, VK3DSM Medical technology 40 The Power Grid’s Future, Part 1 Australia generates the majority of its power from coal and gas but that could change. What is the future electricity grid likely to look like? By Brandon Speedie Electricity generation 48 Antenna Analysis, Part 2 Learn how antennas work and design matching circuits for them. We show you how to use Smith V4.1 software to tune antennas using Smith charts. By Roderick Wall, VK3YC Radio antennas POWER LCR METER Versatile Waveform Generator 76 Precision Electronics, Part 5 One major source of circuit errors to consider is from noise. So let’s look at what we can do to minimise the effects of noise on our circuits. By Andrew Levido Electronic design 88 Transitioning to the RPi Pico 2 We explain what you need to do to convert software for the Raspberry Pi Pico over to the Pico 2, and our progress on porting projects over. By Tim Blythman Microcontrollers 28 Power LCR Tester, Part 1 Our new and robust Tester can measure inductors from 50μH to over 1H, capacitors from 50nF to over 1F and resistors from 1mΩ to 300Ω. It can also measure inductance saturation from 10μH to 1H at up to 30A. By Phil Prosser Test equipment project 46 Audio Mixing & Shed Alarm your own audio mixing cables to add an extra input to an audio 72 Build amplifier, starting on page 46. And make your own workshop/shed alarm with a keyfob remote control; see page 72. By Julian Edgar Simple electronic projects 64 Versatile Waveform Generator This Waveform (function) Generator uses just three op amps to produce square, pulse, triangle, ramp and sine waves from 1Hz to 30kHz. By Randy Keenan Test equipment project 82 Pico 2 Audio Analyser Our Pico Audio Analyser from November 2023 has now been updated to use a Raspberry Pi Pico 2, improving its THD measurement floor to 0.2%. By Tim Blythman Audio project Page 64 transitioning to the page 88 Raspberry Pi Pico 2 2 Editorial Viewpoint 5 Mailbag 27 Subscriptions 59 Mini Projects 92 Circuit Notebook 94 Serviceman’s Log 100 Silicon Chip Kits 101 Vintage Radio 106 Online Shop 108 Ask Silicon Chip 111 Market Centre 112 Advertising Index 1. RF Remote Receiver 2. Continuity Tester 1. YouTube jukebox using a RPi Zero National R-70 Panapet by Ian Batty