"The Natural Philosopher" wrote in message
...
Pinot Grigio wrote:

Whenever we turn a light on or off, an electrical sound can be heard
from
the PC speakers.

Even when off?

I assume we have a faulty connection somewhere.

I wouldn't.

Any suggestion as to the best place to start.

Decemt PC speakers?


Is it more likely to be the
lighting circuit?
I suspect the answer is that it could be anywhere but just thought I'd
ask!
You can get small ferrite rings to reduce spikes and HF interference. You
thread the signal cable through the ring a few times. As someone said
earlier capacitors pass HF, so inductors block them. By winding the witres
round you make a low value inductor.

Peter Scott