[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.
roman
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