[OT] Baby monitor picking up "hum"

["Hawes,Timothy Edward (GEG)" <haweste@xxxxxxx>]

OK, so not strictly an HA application, but one that's been bugging me for
a
while.

We've got a "Tomy" baby monitor which has started to broadcast
unwanted
noise from the receiver, an electrical "hum". We've changed the
wall-wart as
that appeared to have a different fault and it now seems a bit worse.
There's approx 1m of cable between the wall-wart and the receiver,
terminating in a centre-positive-type jack plug.

Would one of these clamp on magnets stop the hum being picked up ? (like
the
things you see on monitor cables etc.)

The hum is most noticeable at night (when the house is quiet) and the
monitor is not placed near *lots* of mains cabling, although it is
plugged
into the wall.

Any thoughts ?

Thanks,

Tim H.

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