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Contents Vol.39, No.01 January 2026 12 Acoustic Imaging Acoustic imaging is a technology that can be used to determine the source of sounds and provide visual feedback. This can be useful in applications like trying to find a gas leak or the testing the acoustics of a concert hall. By Dr David Maddison, VK3DSM Scientific feature PAGE 12 10 26 Power Electronics, Part 3 In this series of articles, we explore the principles of power electronics. In this part, we cover the fundamentals of transformers & inductors, followed by how to use them, within the context of isolated DC-DC converters. By Andrew Levido Electronic design 49 How to use DCC ACOUSTIC IMAGING This in-depth guide to using our DCC Decoder and Base Station covers the trackwork, using and programming configuration variables (CVs) and more. It also serves as a helpful introduction to DCC. Part 3 by Tim Blythman Model train feature 66 How to Design PCBs, Part 2 Setting up PCB design rules to suit fabricators is important. We also provide some tips and tricks to help you during schematic capture and PCB layout. After that, we describe how to get your PCB design made into reality. By Tim Blythman Making your own PCBs 35 DCC Base Station The next main component needed for a complete DCC system is a base station, to provide power and data to the tracks. Our Base Station uses a Pico 2 microcontroller module and suits HO/OO and N-scale operations. Part 2 by Tim Blythman Model train project 56 Remote Speaker Switch Remotely switch up to six pairs of speakers connected to a single amplifier. Or combine many Remote Speaker Switches to switch up to 18 pairs of speakers. Suitable for amplifiers up to 400W or 800W per channel. By Julian Edgar & John Clarke Audio project 78 Weatherproof Touch Switch This sealed touch switch has no moving parts and can be operated even if you’re wearing gloves. All you need is a piezo touch switch, a flip-flop module and a 6V DC coil relay. By Julian Edgar Simple electronic project 80 Earth Radio, Part 2 Solar and atmospheric disturbances, like storms or auroras, can be heard using this ‘natural’ radio receiver. It is battery-powered and utilises a portable loop antenna, so you can use it nearly anywhere. By John Clarke Scientific / radio receiver project Page 35 DCC Base Station 2 Editorial Viewpoint 4 Mailbag 61 Subscriptions 75 Silicon Chip Kits 76 Circuit Notebook 86 Online Shop 88 Serviceman’s Log 94 Vintage Radio 101 Ask Silicon Chip 103 Market Centre 104 Advertising Index 104 Notes & Errata 1. Scale speed checker for model railway 2. HTTP to HTTPS bridge Rebuilding the Kriesler 11-99 by Fred Lever