Practical
Electronics
olume . o.
cto er
ISSN 2632 573X
Contents
Pro ects and Circuits
High-Power 45V/8A Variable Linear Supply – Part 1 by Tim Blythman
This adjustable bench supply can deliver heaps of power, up to 360W in total,
making it ideal for the test bench or just general-purpose use.
16
Precision Audio ignal Am lifier by Jim Rowe
This impressive amp delivers 30V peak-to-peak up to around 230kHz and boasts
two switched gain settings of either 1.00 times (0dB) or 10.000 times (+20dB).
27
Arduino ased igital Audio illivoltmeter by Jim Rowe
32
Set up and calibrate audio systems with this low-cost, easy-to-build, highly accurate
design. ased on the o ular rduino it s an essential iece o test e ui ent
eries
eatures and Columns
The Fox Report by Barry Fox
More lessons from lockdown
8
Techno Talk by Mark Nelson
Now is the autumn of our discontent…
10
Net Work by Alan Winstanley
This month, a spookily accurate prediction of tech use from the 1940s, updates on
ransomware, plans for visiting the Red Planet and the launch of microsatellites.
12
Circuit Surgery by Ian Bell
Rail-to-rail and single-supply op amps
42
Practically Speaking by Mike Hibbett
Introducing the K40 laser cutter and engraver
46
a s Cool eans y ax The agnificent
Flashing LEDs and drooling engineers – Part 8
50
a e it with icromite y hil oyce
Part 21: Exploring a GPS module with UART communication
54
Pedal Power tation Part by Julian Edgar
his ro ect generates real o er ee s you fit and est o all you can have un
uilding it ro scra and salvaged arts at lo cost
59
Audio ut by Jake Rothman
Low-noise germanium transistor power supply
68
egulars and ervices
Made in the UK.
Written in Britain, Australia,
the US and Ireland.
Read everywhere.
© Electron Publishing Limited 2020
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 2020 issue of Practical Electronics will be
published on Thursday, 1 October 2020 – see page 72.
Practical Electronics | October | 2020
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