[PD] noisy soundcard

Roman Haefeli reduzierer at yahoo.de
Mon Mar 12 16:32:39 CET 2007

On Sun, 2007-03-11 at 22:53 -0400, Martin Eckart wrote:
> Hi all,
> I've had an annoying hum coming from my edirol FA-101 when I hook it up 
> to PA systems and have finally figured out that it occurs only when my 
> laptop is plugged in and not running on batteries.  The FA-101 is also 
> plugged in (boo 4-pin 1394 connections...) and then the amps I run into 
> are also 3-pin plugs and leads me to believe that this is probably a 
> ground loop issue.  Can anyone suggest possible solutions?  Is there a 
> power bar that isolates grounds?

hello martin

lifting the ground of the power-plug would solve the problem, though it
isn't recommended and might be dangerous. 
better would be to galvanically isolate your FA-101 from the amplifiers.
this could be done by transmitting the soundsignal over a transformator.
there are DI-boxes around with a ground-lift button, which do exactly
that. but you could also buy an appropriate trafo and solder the
necessary plugs to it yourself.



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