17 Oct
2003
17 Oct
'03
1:21 p.m.
On Fri, Oct 17, 2003 at 11:08:34AM +0300, Tommi Sakari Uimonen wrote:
There's a lot of info available on proper grounding techniques.
E.g. there's some here:
http://www.cs.uu.nl/wais/html/na-dir/AudioFAQ/pro-audio-faq.html
I tried
putting everything on the same power strip and I still get the
noise. I have a mixer and an amplifier that the signal is going
through, and I get the same noise going:
Then you should have all the equipment physically connected to each other
from their cases, like grounding them together. ** BUT BEWARE, THIS MIGHT
BE DANGEROUS. ** I don't know where you live, but in Finland the
electricity system is pretty darn safe and I wouldn't have any hesitations
to do so. There might be high voltage differences between the cases, so
all equipment should be disconnected from the outlet before grounding them
together. And take life insurance first :) And don't sue me if something
blows :) > > It appears to be system load based, it might
be an internal voltage
> > interaction when your CPU goes from idle to active. I've seen
> > this before..... try to run this at a bash prompt:
> > while true; do yes > /dev/null ; done
>
> This takes away a large part of the noise. There is still some noise
> that sounds different, and I can still hear my mouse move. When I move
> my mouse vigorously, it starts sounding closer to what it sounds like
> when that shell script is not running.
There are various suggestions for this kind of problem in the old
Audio-Quality-HOWTO:
http://www.linuxdj.com/audio/quality
--
Paul Winkler
http://www.slinkp.com
Look! Up in the sky! It's MIGHTY CHAIN WOMAN!
(random hero from isometric.spaceninja.com)