How to remove noise from DC line?

tripathdude · 19th March 2008, 10:58 PM

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.

kevinkr · 20th March 2008, 04:26 PM

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.

19th March 2008, 10:58 PM	#1
tripathdude diyAudio Member Join Date: Mar 2007	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.

20th March 2008, 04:26 PM	#2
kevinkr diyAudio Moderator Join Date: Sep 2004 Location: Boston, Massachusetts Blog Entries: 6	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. __________________ www.kta-hifi.net

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