Subject: Re: [linux-audio-user] hum from laptop soundcard
From: alex dray (ffwlogos_AT_hotmail.com)
Date: Sat Apr 19 2003 - 02:36:11 EEST
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>
>Reply-To: linux-audio-user_AT_music.columbia.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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