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Practical Electronics Volume 54. No. 10 October 2025 ISSN 2632 573X Contents Projects and Circuits Seaside Sound Simulator by John Clarke 6 Relax and enjoy the sound of the seaside from the comfort of your home. Forget the scorching heat in summer, the cold winds of winter or your swimsuit being full of sand! It’s a fun-filled project, ideal for beginners and experienced constructors alike. Compact HiFi Headphone Amplifier, part two by Nicholas Vinen 27 Our new Stereo Headphone Amplifier fits in a neat package and has two sets of inputs with individual volume controls. Having described its performance and how it works, we’ll look at the circuit board design before getting into construction and testing. Upgraded Electric & Bass Guitar Pickguards by Brandon Speedie 42 The control circuitry on electric basses has remained remarkably simple for over 70 years. These PCBs offer more advanced features and a cool aesthetic. They suit many popular models of electric bass, as well as the Fender Telecaster electric guitar. 3D Printer Filament Drying Chamber, part one by Phil Prosser 60 This enclosure can store up to four 1kg reels of 3D printer filament, keeping them dry and ready for use at any time. You don’t even need to remove them – the filament can simply be fed to the printer through a small hole in its lid. Series, Features and Columns Techno Talk by Max The Magnificent Banshees & Bananarama; join me on a journey through music technology history. 4 Audio Out by Jake Rothman Three discrete class-A buffer module PCB designs. 14 Precision Electronics, part nine by Andrew Levido 20 This final instalment in the series brings together everything covered in the first eight parts with its discussion of overall System Design. We take what we have learned so far and see how to approach the design of a precision electronic system. Max’s Cool Beans by Max The Magnificent Weird & Wonderful Arduino Projects, part 10: How good are your reactions? 34 The Fox Report by Barry Fox 41 Electronics retailers stand to benefit from the end of Windows 10 support in October. Circuit Surgery by Ian Bell Measuring the frequency response of a circuit using a PC sound card, part 1. 52 The Life of Nikola Tesla, part one by Dr. David Maddison 68 Nikola Tesla was a prolific inventor, engineer, futurist and essayist. He spoke eight languages and had a wide range of interests. Despite his ‘mad scientist’ vibe, his contributions to our modern industrial civilisation are significant. Regulars and Services Made in Australia & the UK. Written in Britain, Australia, the USA and Ireland. Read everywhere. © Silicon Chip Publications Pty Ltd 2025 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 November 2025 issue of Practical Electronics will be published on Thursday, 2nd of October, 2025 (see p80). Practical Electronics | October | 2025 Editorial Are surface-mount devices less reliable than through-hole parts? Reader services – Editorial and Advertising Departments Subscribe to Practical Electronics and save money Practical Electronics Back Issue DOWNLOADS – 2024 now available! Electronics Teach-In Bundles 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 2 3 33 59 76 79 80 Renewals paid by PayPal, Visa and Mastercard are now handled via our website: www.electronpublishing.com 1