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Contents Vol.35, No.8 August 2022 14 IC Fabrication, Part 3 Due to the increasing transistor density of ICs, newer manufacturing technologies are required. FinFETs, GAAFETs and now “multi-chip modules” are some of the methods used to produce ever more packed silicon dies. By Dr David Maddison Semiconductors 34 History of Silicon Chip, Part 1 Leo Simpson, the founder of Silicon Chip magazine tells the story of how and why Silicon Chip formed. It all started in 1984, while he was the editor of the magazine Electronics Australia. By Leo Simpson 60 DH30 MAX Li-ion Spot Welder Many new welders that use Li-ion batteries have been popping up online, at prices that you would consider reasonable. While the DH30 MAX has the beginnings of a good design, it wasn’t without its stumbles. By Phil Prosser Review 26 Wide-Range Ohmmeter, Part 1 This auto-ranging Ohmmeter measures just about any resistance you could want, from 1mW all the way to 20MW. It’s accuracy is better than ±1%, and it’ll run for ~24 hours of active use with its six AA cells. By Phil Prosser Test equipment project 48 isoundBar with Built-in Woofer Why spend over $1000 on a good commercial soundbar when you can build your own for less than half that! Just make sure you have enough room for it, as our isoundBar measures 1.24m wide. By Allan Linton-Smith TV & Audio project 64 SPY-DER: a 3D-printed Robot SPY-DER is a speech and web-controllable surveillance robot. It walks like a spider, and can monitor locations using its onboard camera. You can build it yourself by using a 3D printer, some servomotors and a few low-cost electronic components. By Arijit Das Raspberry Pi & Arduino project 80 Secure Remote Mains Switch, Pt2 We finish off our Remote Mains Switch by showing how you assemble, test it, and then register the transmitter(s). We also have a separate panel on how the rolling code system works. By John Clarke Mains power project Wide-Range OhmMeter Page 26 isoundBar Page 48 Page 64 SPY-DER A 3D-PRINTED DIY ROBOT 2 Editorial Viewpoint 4 Mailbag 23 Subscriptions 47 Product Showcase 70 Online Shop 72 Serviceman’s Log 88 Vintage Equipment 96 Circuit Notebook 100 Ask Silicon Chip 103 Market Centre 104 Advertising Index 104 Notes & Errata AVO valve testers, part 1 by Ian Batty 1. Mains timer / LED lamp dimmer 2. Hearing loop (telecoil) phone headset 3. Smoke, alcohol or LPG alarm