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Contents Vol.35, No.11 November 2022 14 The Technology of Torches Page 41 Illumination has always been an important technology for humans, especially in a portable form for nighttime use. Once a stick with a fire on the end, modern torches are increasingly smaller and more powerful. By Dr David Maddison Handheld lighting feature 56 Raspberry Pi Pico W The Pico W is the newest Raspberry Pi module which now incorporates WiFi functionality, all for only a few dollars more! By Tim Blythman Microcontroller module review LC Meter Mk3 Raspberry Pi 76 WiFi-Synchronised Analog Clock Pico W If you can’t get reliable GPS signals, you can adapt the GPS-Synchronised Analog Clock (Sept 2022) to use a D1 Mini module to track time via WiFi. By Geoff Graham Timekeeping feature 78 Particulate Matter (PM) Sensors In the last article of this series on air quality sensors, we take a closer look at PM2.5 sensors, also called “dust” or “smoke” sensors. By Jim Rowe Using electronic modules Page 56 Page 62 28 Christmas LED Icicle Decoration This Tiny LED Icicle is simple to build with just a few components. It’s easy to join multiple together, making for a great holiday decoration. By Tim Blythman Christmas decoration project 41 LC Meter Mk3 This modernised LC Meter measures a wide range of capacitances from 1pF to more than 1200pF with 0.1pF resolution, and inductances from 100nH to 2.5mH. It uses three AA cells and has a battery life of ~72 hours. By Charles Kosina Test & measurement project 49 Transient DC Supply Filter This 12V DC Supply Filter helps prevent voltage spikes ruining your devices or supply noise messing with their performance. It can handle up to 5A (or 10A with different inductors), and fits in a compact UB5 Jiffy box. By John Clarke Power conditioning project 62 Active Monitor Speakers, Part 1 These high-quality Active Monitor Speakers create a superlative sound system to complement your living room. High-end Satori drivers are used throughout the project and can be combined with an optional subwoofer. By Phil Prosser Audio project 90 30V 2A Bench Supply, Part 2 To finish our new Bench Supply, we cover the construction details with extra attention to the mains wiring, testing and calibration procedures. By John Clarke Bench supply project Active Monitor Speakers with optional subwoofer 2 Editorial Viewpoint 4 Mailbag 30 Circuit Notebook 84 Vintage Radio 88 Online Shop 1. Digital preamp with tone controls 2. ESP32-Camera sentry with object detection Philips Minstrel radios by Assoc. Prof. Graham Parslow 100 Serviceman’s Log 108 Ask Silicon Chip 111 Market Centre 112 Advertising Index 112 Notes & Errata