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Practical
Electronics
Volume 49. No. 11
November 2020
ISSN 2632 573X
Contents
Projects and Circuits
The Christmas Tree that grows! by Tim Blythman
Build our superb scalable LED Christmas tree – you can make it as modest or
impressive as you like. (See our PCB special offer on page 22!)
16
USB Digital and SPI Interface Board by Tim Blythman
A very handy general-purpose controller which can handle up to eight digital
lines from your PC, including an SPI serial interface.
24
High-Power 45V/8A Variable Linear Supply – Part 2 by Tim Blythman
This month, we start construction of our powerful PSU, based around a 500VA
toroidal transformer and four power transistors.
28
Five-way LCD Panel Meter / USB Display by Tim Blythman
A simple device to replace multiple panel meters. It can also be used as a small
additional text screen for a PC, Raspberry Pi or any other computer with USB.
36
Series, Features and Columns
The Fox Report by Barry Fox
hoosing your monitor curved or at
8
Techno Talk by Mark Nelson
Every little helps
10
Net Work by Alan Winstanley
In an extended issue of Net Work, we look at the vitally important issue of trust in
online purchases and reviews.
12
Pedal Power Station! – Part 2 by Julian Edgar
ast month, e developed the mechanical section no it s time to use
electronics to add instruments and condition the power output.
41
Make it with Micromite by Phil Boyce
Part 22: A modern-style analogue GPS clock
45
Circuit Surgery by Ian Bell
Analogue multipliers
50
Practically Speaking by Jake Rothman
Restoring old equipment – Part 1
54
a s ool eans by Max The Magnificent
Flashing LEDs and drooling engineers – Part 9
58
Audio Out by Jake Rothman
heremin udio mplifier
art
63
Regulars and Services
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 December 2020 issue of Practical Electronics will be
published on Thursday, 5 November 2020 – see page 72.
Practical Electronics | November | 2020
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