ProScan: Hum when using usb cable

JDE100

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Nov 13, 2020
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Trying to setup Pro scan remote scanner over ip. Have everything working but I'm getting a bad background hum when the usb cable is hooked from scanner to computer usb port. Guess away even just the audio cable is hooked up. Same audio source on both options. I tried multiple usb ports also. Any ideas?
 

kruser

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Nov 25, 2007
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West St Louis Cnty, MO
Thank you I will try this. Its interesting that it only happens when I have the USB cable hooked up. No hum when just using audio cable.
The USB cable or device its hooked to is what is providing the path to ground. Any imbalance in the path will cause hum, hence the need for a ground loop isolator.
 
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