Audio hum in car using AC-DC Power adapter.
Has anyone a fix for this? I'm using a 2 AC plug output AC-DC adapter in my car to power my xbox and LCD Panel. I noticed when I unplug the lcd panel (says 12v. but multimeter reads 16v, which is why I didn't try to hard wire it instead, 7inch 16x9) it gets just a LITTLE quieter but still definitely hear it. Now, when i turn the XBOX and LCD off, i still here the humm. It's not alt. wine, as it's always the same sound, no matter if I gas it or not. As soon as i flip the switch off, it goes away. I believe it's a Linksys model AC-DC convertor rated well beyond the power i'm needing.
Anyone else found a cure for this? I haven't try running the power and RCA's separately yet, HOWEVER, even with the power adapters unplugged, I still get the hum, noticeably. I'm so down right now, as i've spend my time over the past 2 weeks fiberglassing a nice looking mold and all to fix everything all beautifully, and spent my time pulling everything apart to keep a professional looking install. So i'd really like to get this working without any audio hum. It's patched through my Sony Head unit input. Thank a bunch for any feedback you can give me for help here. :-)