[LAU] loud noise out of external soundcard in the bandroom when AC-powered

[Christian Schumann]

On Mon, Mar 17, 2008 at 11:51:10AM +0100, Matthias Schönborn wrote:
> Now, before I start fiddling around, is this because of a poorly shielded 
> powersupply? Or is this problem related to the shielding of the laptop? How 
> can I build an effective shielding?
Here in our lab we use aluminium foil with ground contact. Does not look
very pretty, but it works.
You might also want to consider the possibility of a ground loop. Do you
have a DI box with a ground lift between the sound card and the mixer
input?

Regards
Christian

-- 
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Dipl.-Phys. Christian Schumann   |Technische Universitaet Kaiserslautern
Mail: schumann at physik.uni-kl.de  |           Fachbereich Physik
Tel.: 0631/205-4842              |     http://www.physik.uni-kl.de 
Fax.: 0631/205-3902              |    
Post: Erwin-Schroedinger-Strasse, D-67663 Kaiserslautern
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