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Practical Electronics Volume 54. No. 6 June 2025 ISSN 2632 573X Contents Projects and Circuits The Styloclone musical instrument by Phil Prosser 3 This homage to a musical classic is an excellent project for beginners. It’s also fun for the musically inclined. The whole project fits on one easy-to-build circuit board that can be mounted in a case or built as a free-standing project. Intelligent Dual Hybrid Power Supply, part one by Phil Prosser 20 This power supply has two outputs, each capable of up to 25V DC at 5A. They can be connected in series and ganged up to form a dual tracking supply, and both outputs are controlled using a graphical LCD screen, two rotary encoders and two buttons. Dual Mini LED Dice by Nicholas Vinen 42 This article is a blend of the old and the new. It was inspired by a design from 1994 but has been updated to use more modern parts (still with discrete logic) and runs from a 3V coin cell. As we have used mostly SMDs, it will easily fit in your pocket. The Skill Tester 9000, part two by Phil Prosser 64 This retro game is a fun and educational project to create a dexterity-based game with nine difficulty levels, a health bar graph, a timer and four different sound effects. It is based mainly on 4000-series logic and all through-hole parts on a single circuit board. Series, Features and Columns The History of Electronics, part six by Dr David Maddison 13 Over the last five issues, we have described many individuals and organisations that made vital contributions to electronics. This sixth and final part in the series covers innovations from universities, companies and other organisations since 1962. Circuit Surgery by Ian Bell 34 Topics in digital signal processing – Implementing DSP on a microcontroller, part one. Audio Out by Jake Rothman A phantom-powered direct injection (DI) box using a cascoded JFET/BJT pair. 50 Techno Talk by Max The Magnificent Humanoid robots may not be the stuff of science fiction much longer. 54 Max’s Cool Beans by Max The Magnificent 56 Weird & Wonderful Arduino Projects, part 6: shift registers and 8-segment displays. Precision Electronics, part six by Andrew Levido 70 These days, most analog circuitry eventually interfaces with the digital realm, such as with a microcontroller, so we also need to understand the precision approach to analog-to-digital and digital-to-analog converters (ADCs & DACs). Regulars and Services Editorial Don’t tin wires going into terminal blocks Reader services – Editorial and Advertising Departments Subscribe to Practical Electronics and save money 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 33 77 79 80 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 July 2025 issue of Practical Electronics will be published on Thursday, 5th of June 2025 (see p80). Practical Electronics | June | 2025 Renewals paid by PayPal, Visa and Mastercard are now handled via our website: www.electronpublishing.com 1