On Fri, 28 May 2010, Folderol wrote:
>
> Once you connect the analogue side of the the USB device to the
> installed (high quality card) you have an earth loop that traverses
> both the analogue and digital domains. You also have an +5V loop (unless
> the USB device is externally powered) This loop does not exist when the
> USB card is self testing. I still can't think exactly how, but I
> believe this is likely to be a significant part of the problem.
OK... but ground loops usually produce noise or a DC offset,
right? What could be causing the ground loop to oscillate?
-gabriel
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Received on Sat May 29 00:15:09 2010
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