Practical
Electronics
Volume 52. No. 1
January 2023
ISSN 2632 573X
Contents
Projects and Circuits
Classic LED Metronomes by Randy Keenan
14
These two Metronomes use only discrete components and simple logic chips, making
them easy to understand and build. They are both great projects for a beginner.
Geekcreit’s 35MHz-4.4GHz Signal Generator by Jim Rowe
This self-contained module uses a wideband digital synthesiser chip, onboard
microcontroller, OLED display and pushbuttons to set the desired frequency.
27
Remote Control Range Extender by John Clarke
32
Convert an IR remote to use UHF and it will work at much longer ranges – even
when something is between the remote and the device.
Multi-Channel Speaker Protector by Phil Prosser
If you’re driving a lot of speakers you need a matching compact speaker
protector to prevent driver destruction should something go wrong.
41
Techno Talk by Mark Nelson
Raudive Voices Revisited
8
Net Work by Alan Winstanley
This month’s Net Work looks at smart light bulbs, tests Alexa’s ‘skill’ in controlling
them and offers an overview of the latest energy labelling bands for LED bulbs.
10
Audio Out by Jake Rothman
Universal single op amp board (optimised for audio electronics) – Part 2
46
Make it with Micromite by Phil Boyce
Part 43: Connecting more than one display to a PicoMite
52
Circuit Surgery by Ian Bell
Electronically controlled resistance – Part 5
56
Max’s Cool Beans by Max The Magnificent
Arduino Bootcamp – Part 1
62
Wireless for the Warrior
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Next month! – highlights of our next issue of Practical Electronics
2
4
6
7
7
Series, Features and Columns
Regulars and Services
9
51
68
70
71
72
Made in the UK.
Written in Britain, Australia,
the US and Ireland.
Read everywhere.
© Electron Publishing Limited 2022
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 February 2023 issue of Practical Electronics will be
published on Thursday, 5 January 2023 – see page 72.
Practical Electronics | January | 2023
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