> > Wow!  Lots of input on a little observation...
> 
> Rather than messing with your power supply side, you can get an audio
> transformer and put it between your notebook and audio system in the audio
> connection. (Or use the solid state equivalent: an isolation amplifier. But
> that's quite a bit more involved.)
> 
> Gerhard

That's what I had intended to do.  I was working with isolation transformers
I swiped out of old modems, but then I broke one of them.  I gave up.  The
"cheater"/"ground-breaker" works well enough.

Mike H.
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