[linux-audio-user] Re: My Edirol UA-20 arrived, but now I have a big problem!

[Steve Harris]

On Tue, Feb 18, 2003 at 08:19:19PM +0100, Frank Barknecht wrote:
> Hallo,
> Frank Barknecht hat gesagt: // Frank Barknecht wrote:
> > my Edirol UA-20 USB audio device has arrived, and I also got it to
> > work: It was almost plug and play. But now I have a serious problem,
> > and that is noise when moving the mouse. I'm at loss what to do.
> > Everytime I move the pointer with mouse or touchpad on my Acer
> > Travelmade, the UA-20 produces nasty screetching, crackling and
> > scratching. This doesn't happen, when I unplug the power supply. The
> > UA-20 gets its power from the USB-port, so I suspect that this creates
> > the conflicts. 
> > 
> > Does anyone have an idea how to get rid of this noise? 
> 
> Another self-reply, sorry. But: I could remove the buzzing by going
> with all my stuff (notebook, UA-20, power supply) into another room
> and connecting it to another amplifier. So it seems, I am prey of a
> buzz-loop (is that the word for "Brummschleife"?) in my room. 

Yup, I've had ground loops on my dell when connecting to a projector and a
mixer. Put a DI box between the laptop and amp or unplug from the mains :)

- Steve