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Practical Electronics olume . o. June 2021 I Contents Projects and Circuits Touchscreen Wide-range RCL Box – Part 1 by Tim Blythman Our new Touchscreen Wide-range RCL Box not only gives you a range of resistances and ca acitances ut also inductances all at your fingerti 16 oadies est ignal enerator by John Clarke This test oscillator is ideal for testing balanced and unbalanced inputs on ro essional sound e ui ent. t s s all rugged very orta le and easy to use. 24 Concreto ea er ystem by Allan Linton-Smith hese enclosures are stoc standard concrete uilding loc s find at very lo cost in ust a out every hard are store. ntrigued 30 eries the ty e you ll ead on eatures and Columns he o e ort by Barry Fox Online health – the good, the bad and the ugly te ie i .co ic o the onth lan lu lein 8 echno al by Mark Nelson Bad science and good 10 et or by Alan Winstanley his onth the longter e ect o loc do n and technology on here e or legacy e ory devices and a round u o the latest e citing s ace ne s. 12 ic art tart by Mike Tooley a ing sense o inductors 36 Io Cric et by Md. Khairul Alam art o ade easy or everyone Audio Out by Jake Rothman icro hone rea lifier or ocoder 42 48 art a e it with icromite by Phil Boyce art nternet connection ith an i i odule art Circuit urgery by Ian Bell Transformers and LTspice – Part 1 58 a s Cool eans y ax The agnificent lashing s and drooling engineers art 62 Wireless for the Warrior u scri e to Practical Electronics and save money NEW! Practical Electronics ac issues A – now availa le! eader services Editorial and Advertising e artments Editorial o ade easy very easy elco e to ric et E clusive icrochi reader offer in a icrochi ly ac tandalone valuation oard PE Teach-In 8 PE Teach-In 9 irect oo ervice uild your li rary o care ully chosen technical oo s Practical Electronics PC ervice s or ractical lectronics ro ects each In undle what a argain Classified ads and Advertiser inde e t month highlights of our ne t issue of Practical Electronics 2 4 6 7 7 egulars and ervices Made in the UK. Written in Britain, Australia, the US and Ireland. Read everywhere. © Electron Publishing Limited 2021 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 2021 issue of Practical Electronics will be published on Thursday, 3 June 2021 – see page 72. Practical Electronics | June | 2021 54 40 41 1