[linux-audio-user] Re: The famous "Jack Hum" (Can't record and desparate)

[Rob Fell]

Rob Fell wrote:
> Do you have a stethoscope? Unload the machine and get that noise back. 
> Now listen.  Can you identify the component?

Oh - and BE CAREFUL.  This circuitry isn't designed for people to 
casually poke around.  Remember that it takes less than a millisecond to 
release the magic smoke.

Find an insulating material to cover the end of whatever you use as a 
stethoscope, and work slowly and methodically.  Don't short things out - 
even if they're 'not connected to anything else'.

R