I am using an Eric Walin mic preamp and an accelerometer for measuring resonance. I just noticed that all of my measurements have a large 60hz hum in them. Even when the accelerometer isn't plugged in the hum is there. As a matter of fact, the hum is there even when the soundcard input isn't plugged into the preamp at all. It only goes away when I ground the input. Shouldn't the hum go away when the input is plugged into the preamp? Could there be something wrong with the peramp? Or is it a problem with the soundcard? Please let me know if you know anything I can try to do to get rid of the hum.
Thanks,
-Chad
Thanks,
-Chad
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