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Old 19th March 2008, 10:58 PM   #1
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Default How to remove noise from DC line?

I decided to remove the 5v regulator that powers the DAC chip on my squeezebox and use the 5v line off my ELPAC power supply to power the sb and the DAC at the same time. When I did this, I have a bad humming noise from the speakers, but the sound has improved. What do I do to eliminate this problem? Should I use a DC line filter? Thanks for your time in this matter.
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Old 20th March 2008, 04:26 PM   #2
kevinkr is offline kevinkr  United States
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You've probably managed to create a ground loop powering both of these from an external supply - in the original application the grounds were not tied together at the circuits being powered, now they are.

Try a separate floating supply for each.
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