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-   -   "Ground Loop" in Snubberized PSU *fixed* (http://www.diyaudio.com/forums/power-supplies/208927-ground-loop-snubberized-psu-fixed.html)

Redshift187 16th March 2012 01:46 PM

"Ground Loop" in Snubberized PSU *fixed*
 
So I accidentally found the cause of my "ground loop" between my media computer and my chip amp last night. My general setup was a snubberized PSU (15mF caps || 0.1uF caps || 10R + 0.1uF caps), connected to the amp by a 3-wire 2m long umbilical. I had been reading that using small capacitance before an inductive cable can cause problems, so I removed everything but the 15mF caps. When I turned it on, all hum from the PC connection was gone!

The hum had been driving me nuts, because my switch box has all the grounds permanently connected, so I was getting it regardless of which source I was listening to unless I unplugged the audio cable from the PC.

gootee 18th March 2012 12:44 AM

So did you try re-installing the 10R + 0.1 uF to see if the hum is still gone?

Redshift187 18th March 2012 02:34 AM

No, sorry. I'm satisfied with it now, and I'll probably leave it this way for a long time.


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