USB hum/noise isolation?
"Richard Crowley" wrote in message
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"Meindert Sprang" wrote ...
Was that interface powered by USB or did it have it's own power
supply?
There could be a loop.
I thought the external power supply was a wall-wart with a
2-prong power mains plug.
No loop through ground then. But even then it should best be plugged in the
same power strip as the laptop.
Just the other day I had a mixer in one outlet (grounded) and a drumcomputer
in an other (wall wart), which whas on a drifferent mains group of a 3phase
system. Huge 50Hz hum.
Meindert
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