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Contents Vol.38, No.10 October 2025 12 Autonomous Vehicles Part 1: Page 29 Fully autonomous vehicles and advanced driver assistance systems make a driver’s job easier (or redundant!). We explain how they work, what different systems have been developed and the different levels of autonomy. By Dr David Maddison, VK3DSM Automotive technology 46 HomeAssistant, Part 2 Here’s how to set up your own fully featured home automation system using a Raspberry Pi. In this final part of the series, we cover the advanced features like cameras, dashboards, remote access and more. By Richard Palmer Home automation Digital Preamplifier and Crossover 68 Finding Bargain Speakers This article will help you know what to look for when searching for goodquality second-hand speakers on a budget. By Julian Edgar Audio & hifi 94 Vintage Reinartz 2 TRF Receiver John Reinartz was a skilled radio designer, and in the 1920s he published a circuit for a two-valve tuned radio frequency (TRF) receiver. A redesign was later published by David Whitby in Electronics Australia, with a kit manufactured by Technicraft in Katoomba, NSW. By Philip Fitzherbert & Ian Batty Vintage Radio 29 Digital Preamp & Crossover This advanced preamplifier uses digital processing and can also act as a crossover. It has three digital inputs, two digital outputs, four analog stereo inputs, four stereo outputs, high-fidelity USB & a stereo monitoring channel. By Phil Prosser Audio/hifi project 54 Vacuum Controller Automatically switch on a vacuum when a tool like a circular saw is started. It has an adjustable run time after the appliance is turned off, optional blast gate control and is rated for up to 10A <at> 230V AC for each appliance. By John Clarke Workshop project 72 Dual Train Controller Wirelessly control two different model locomotives from a single box (and possibly up to 10 trains and onboard sounds!). This is an add-on to the Battery-Powered Model Train project from January 2025. By Les Kerr Model railway project 80 Pendant Speaker, Part 2 We show you how to build, test and tune your new Pendant Speaker. It’s easy to assemble using a pre-made enclosure and can be configured differently depending on how you will be mounting and using it. By Julian Edgar Audio/hifi project Vacuum Controller For workshops, starting on p54 2 Editorial Viewpoint 4 Mailbag 24 Circuit Notebook 52 Subscriptions 86 Serviceman’s Log 92 98 Online Shop – Parts Online Shop – Kits 99 Ask Silicon Chip 103 Market Centre 104 Advertising Index 104 Notes & Errata 1. Driving a numerical VFD with a PIC