I recently moved my MP3 player PC from on top of my home entertainment
center (wife didn't like it there; go figure) to inside a cabinet in
the adjacent kitchen. I was so proud of the outlet and RCA jack
connections I installed to make everything nice and neat.
Unfortunately, I've created a problem ... the PC that houses my MP3
collection and player is now plugged into a different circuit, and
likely different phase, from my Denon receiver in the other room. A
loud ground hum is very obvious. I know that it is a ground hum
because I can unplug the PC from the outlet (so that it is running off
UPS), and there is no hum.
Without rewiring the outlet (it was a bear to find a circuit I could
tap into; long story), what clever ideas are there for getting rid of
the ground loop? Some way to opto-isolate it, for example. I thought
of using a 2.4 GHz transmitter thing (X10) to transmit the audio (and
it would only be transmitted a few inches), but then every time the
microwave oven is on, my sound is interfered with.