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 _______________________________________________ Linux-audio-dev mailing list [email protected] http://lists.linuxaudio.org/listinfo/linux-audio-dev
