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Practical Electronics Volume 52. No. 11 November 2023 ISSN 2632 573X Contents Projects and Circuits LC Meter Mk3 by Charles Kosina 18 This LC meter measures a wide range of capacitances and inductances, from less than 1pF to more than 1.2nF, and from less than 100nH to more than 2.5mH. DC Supply Filter for vehicles by John Clarke This DC Supply Filter solves two big problems with 12V DC vehicle supplies: supply noise messing with a device’s performance and voltage spikes possibly frying it. 25 PM (particulate matter) ‘Dust’ Sensors by Jim Rowe 30 In this last article on low-cost air quality sensors, we look more closely at particulate matter (PM) sensors, also called ‘dust’ or ‘smoke’ sensors. Anodising Aluminium at Home by Phil Prosser 36 Fancy turning your hand to anodising aluminium? As it turns out, as long as you take due care (especially with the chemicals used), it isn’t that hard to do it yourself. Series, Features and Columns Techno Talk by Max The Magnificent Where’s my pneumatic car? 8 Net Work by Alan Winstanley 10 Reports on energy-saving incentives for smart meter users, the ORA Funky Cat BEV launches, some of Logitech’s mice are considered plus more space news. The Fox Report by Barry Fox Time is money 16 Max’s Cool Beans by Max The Magnificent Arduino Bootcamp – Part 11 44 Circuit Surgery by Ian Bell Gyrators Part 3 – Parametric Equaliser Circuits 50 Audio Out by Jake Rothman Discrete audio op amp – Part 3 56 Electronic Building Blocks by Julian Edgar Long-distance Remote Control 65 Regulars and Services Made in the UK. Written in Britain, Australia, the US and Ireland. Wireless for the Warrior Subscribe to Practical Electronics and save money NEW! Practical Electronics back issues DOWNLOADS – 2022 now available! Reader services – Editorial and Advertising Departments Editorial Upping your electronics housing game Exclusive Microchip reader offer Win a Microchip MPLAB PICkit 5 PE Teach-In 9 PE Teach-In 8 Teach-In bundle – what a bargain! Practical Electronics PCB Service PCBs for Practical Electronics projects Classified ads and Advertiser index Next month! – highlights of our next issue of Practical Electronics 2 4 6 7 7 9 35 49 55 68 71 72 Read everywhere. © Electron Publishing Limited 2023 Copyright in all drawings, photographs, articles, technical designs, software and intellectual property published in Practical Electronics is fully protected, and reproduction or imitation in whole or in part are expressly forbidden. The December 2023 issue of Practical Electronics will be published on Thursday, 2 November 2023 – see page 72. Practical Electronics | November | 2023 1