[linux-audio-user] hum from laptop soundcard

[Brian Redfern]

I use the quattro with my laptop and its very quiet.

http://www.brianredfern.org

On Fri, 18 Apr 2003, alex dray wrote:

> i think you're out of luck...the point of laptop architecture is to squish 
> everything together....with a monitor and usb (which is fairly high voltage) 
> so close to an integrated audio card, you cannot avoid magnetic influence as 
> shielding at this level is practically impossible....you're best bet (and 
> not a very good solution) is to get a breakout box so the actual dac is 
> physically outside the laptop. If you come up with better solution please 
> let me know,its a problem that frequently drives me nuts
> 
> 
> 
> 
> >From: Ben Saylor <bsaylor at Macalester.edu>
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> >Subject: [linux-audio-user] hum from laptop soundcard
> >Date: Fri, 18 Apr 2003 13:57:06 +0200
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> >
> >Hi,
> >
> >I have a new Dell laptop with a headphone jack as the only external
> >audio output.  With headphones, the sound quality is good and there is
> >little noise to be heard.  However, if I plug in my monitors, the
> >output crackles and hums, regardless of the mixer levels.  There is
> >217 hz constant hum, a 125 hz hum when moving windows, and a 689 hz
> >whine when I run Pd.  The output crackles when I move the mouse
> >(external USB).  I just noticed that it goes away when I unplug the AC
> >adaptor.  I think I remember a similar problem coming up on this list
> >before, but I had no luck searching the archives.  How can I solve
> >this?
> >
> >Thanks,
> >Ben
> 
> 
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