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.
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.
Try a separate floating supply for each.
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