Practical
Electronics
olume . o.
August
I
Contents
Pro ects and Circuits
l imer II by Tim Blythman
Time on your mobile phone is probably accurate to a miniscule fraction of a second,
f yo re year
for a ore rela ed a de o e s ro e s for yo
ow cost ide and igital
Power eter by Jim Rowe
le o
ld a d lo
os
s D al F Po er e er
a yo e
o eeds o eas re rad o fre e y s als fro
ll e ery sef l for
o
witchmode e lacement for
regulators by Tim Blythman
e ery a dy
ree er
al re la ors a e ee aro d for o er
years
ey a e effi e
o
ere s a dro
effi e y al er a e
eries
eatures and Columns
he o
e ort by Barry Fox
Security issues
e e
of e o
e D
o
a
Ds a do
echno al by Mark Nelson
older
o
et or by Alan Winstanley
s o
e e er e d
ro le of o l e se r y Fro do es fr d es
o r al a o al fras r
re e ery
s o l e a d e are all l era le
ic
Par
tart by Mike Tooley
rod
e rd o Pro
Audio ut by Jake Rothman
ro o e Prea l fier for o oder
a e it with
Par
s
icromite by Phil Boyce
e r e o
od le
Par
a
ro
e
Circuit urgery by Ian Bell
ra sfor ers a d s e Par
a s Cool eans y ax The agnificent
Flas
Ds a d drool
e
eers Par
egulars and ervices
Made in the UK.
Written in Britain, Australia,
the US and Ireland.
Read everywhere.
© Electron Publishing Limited 2021
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expressly forbidden.
The September 2021 issue of Practical Electronics will
be published on Thursday, 5 August 2021 – see page 72.
Practical Electronics | August | 2021
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