I am currently working on making a portable desktop (not a laptop) and have discovered that the computer speakers I have and the controller board for the monitor I pulled from a dead laptop both run off 12v. I soldered molex connectors and cable to both and ran them off the PSU (EVGA 500w 80+) and everything works. The problem is that there is a very low unannoying hum in the PSU and when the speakers are powered by it the hum is amplified through them and that IS annoying!
I did the best I could to research the problem, and I believe it is a "Ground Loop." I am not sure how to isolate the ground from the audio so that it is not on the same ground as the PSU. I understand that getting a supply that doesn't hum, dropping from 3 prongs to 2 prongs, or using an entirely separate supply (like a 12v wall transformer) would each remove the hum. What I want to know is if there is any way to fix this on the speaker/amplifier side instead of at the psu or outlet side? Is there a way to ground the speakers without going through the supply and without having to have 2 plugs come out of my computer to the wall?
I did the best I could to research the problem, and I believe it is a "Ground Loop." I am not sure how to isolate the ground from the audio so that it is not on the same ground as the PSU. I understand that getting a supply that doesn't hum, dropping from 3 prongs to 2 prongs, or using an entirely separate supply (like a 12v wall transformer) would each remove the hum. What I want to know is if there is any way to fix this on the speaker/amplifier side instead of at the psu or outlet side? Is there a way to ground the speakers without going through the supply and without having to have 2 plugs come out of my computer to the wall?
