How to eliminate AC hum on mixer?

[Patch]

This annoys the hell out of me. i use my on-board for listening to music, through my DDm4K. The hum/buzz infuriates me!

I've tried all combinations of sockets/extensions, etc... No luck.

I did read that you can use an aftermarket PSU for your laptop that DOESN'T have a groubd cable (ie - figure-8 connection and not clover-leaf connection) but haven't been able to find one for my laptop.

Figure 8


Clover leaf


Of course - I wouldn't DREAM of disconnecting the earth from my laptop...

[djlotus]

Plug your pc into an outlet on a different circuit from all the rest of your gear. The humming you hear is usually harmonics caused by the fan(s) in your PC. If you consider yourself handy, you could install a circuit with a "super-neutral", but probably easier to isolate the PC to a circuit which does not have any power amplifying on it. The humming is the current powering your fan which is running through the neutral and being amplified through your gear. Power conditioners are ok, but they mask the problem, they don't eliminate it. Since the ground and neutral are looped together in the panel in the US on a 120 volt circuit, power conditioners sell like hotcakes. on a 210 volt circuit, the best option is powering off a different circuit.