I have (finally) built myself a little Mame cabinet. I am however having issues with the amplifier I am using. The amp is this 40w one from Maplin (http://www.maplin.co.uk/40w-power-amplifier-module-37737) which I want to run off of the PC supply that supplies the computer too. It works, but when I plug the amp into the soundcard of the computer I get a load of noise out of it (plus the sounds that should be there). It sounds like all the motors within the case are being picked up, I can hear when the HDD accesses, a note change if I slow down the cabinets cooling fan etc. However if I then plug the amp into my MP3 player it is totally clear of any noise.
I am at a loss, how can I get so much unwanted noise from the computer, yet unplug it from the PC and plug it into something else and it is fine.
The only thing I have found on the net is in relation to car amps having a similar issue and them isolating the audio from the headunit to the amp with this black box.
I have the amp wired to the PSU via a molex connector and running off of 12V.
Does anyone have any suggestions?
Many thanks for any assistance you can offer!
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