[LAU] My Tascam US-122

Martin Horn martin.horn at ostec.org
Wed Aug 13 11:17:40 EDT 2008

On Wed, Aug 13, 2008 at 3:18 AM, Shawn Wallis <miesco251 at gmail.com> wrote:

> I got m Tascam US-122 it works fine, the mixers for it dont work in
> Qamix and gnomealsamixer, when I choose the usx2y soundcard the mixers
> are blank, nothing there.  IS that suppost to happen?
> ANyways, I am getting noise from my KRK Rokit powered 5 speakers,
> headphones in the tascam gives me no noise, then I plug from the
> headphones output of the tascam to the speakers and I get noise!  So I
> think it might have something to do with the speakers?
> The noise starts when I plug the USB for the tascam in, even when its
> not plugged in and just touches the metal it makes the noise.
> When I unplug my AC for my laptop, the noise stops...  WHen add
> brightness to my laptop screen I get less noise...

I suppose your laptop has an earth connection on the power cord. Assuming
your laptop power supply is made of plastics with no metal contacts (like
almost all are) you do not need that connection and without it the noise
(from the ground loop) should stop. Just put some kind of isolating tape
over the metal contacts from the earth ground (maybe two layers, because it
might get cut when plugging in) and your ready to go. If you don't want to
carry that tape with you all the time you should try to exchange your power
cord (those from electric shavers looking like an "8" work sometimes).

Good luck!

> Does anyone have any solutions, more troubleshooting tips?  Thanks.
> _______________________________________________
> Linux-audio-user mailing list
> Linux-audio-user at lists.linuxaudio.org
> http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
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