Practical
Electronics
Volume 51. No. 3
March 2022
ISSN 2632 573X
Contents
Projects and Circuits
Mini Isolated Serial Link by Tim Blythman
14
This tiny module provides bidirectional, isolated, full-duplex serial communication.
Ideal when two (or more) boards on separate supplies need to talk to each other.
Busy Loo Warning! by John Chappell
O i
i o
ei
eek
i o ld
Loo W r i
e
ri
LE li
w e
18
e o er more erio
e
eB
o do w
omeo e r i i
Battery Monitor Logger – Part 2 by Tim Blythman
I P r 1 we de ri ed o r ew B er Lo er Now we ll o o er
e i
e p d li r io pro ed re o o
ild d e i
e o
r
io
Electronic Wind Chimes – Part 2 by John Clarke
L
mo
we de ri ed ow o r ew Ele ro i Wi d ime worked Now we
modify the wind chime itself so it can be driven by a series of solenoids.
30
Geekcreit LCR-T4 Mini Digital Multi-Tester by Jim Rowe
i omp di i l e er will ide i
e k d
l eB
FE MO FE
diode LE
ri or re i or
p i or
d i d or – ll or der e er
36
Techno Talk by Mark Nelson
How resilient is your lifeline?
8
Series, Features and Columns
Net Work by Alan Winstanley
A ro d p o re d emer i i
world o e
olo
Fl
a s Cool
i LE
e I er e
d
r er field i
e
i
eans y ax The agnificent
d drooli e i eer – P r 25
Audio Out by Jake Rothman
A lo e o oder – P r 5 B ildi
46
e fil er
Make it with Micromite y hil oyce
P r 3
i
e Mi romi e wi
EEPROM iB
54
o
Electronic Building Blocks by Julian Edgar
Your new laptop speakers
Regulars and Services
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 April 2022 issue of Practical Electronics will be
published on Thursday, 3 March 2022 – see page 72.
Practical Electronics | March | 2022
10
40
Circuit Surgery by Ian Bell
Op mp o e – P r 2
Made in the UK.
22
Wireless for the Warrior
Subscribe to Practical Electronics and save money
NEW! Practical Electronics back issues DOWNLOADS – 2021 now available!
Reader services – Editorial and Advertising Departments
Editorial
ome i
or e er o e
Exclusive Microchip reader offer
Wi
Mi ro ip RN2 03 LoR e
olo Mo e
PE Teach-In 8
PE Teach-In 9
Practical Electronics PCB Service
P B or Pr i l Ele ro i pro e
Classified ads and Advertiser inde
Next month! – highlights of our next issue of Practical Electronics
58
63
2
4
6
7
7
9
21
45
68
72
1
| 
