[linux-audio-user] hum from laptop soundcard

[Paul Winkler]

On Tue, Apr 22, 2003 at 11:19:21AM +0200, Frank Barknecht wrote:
> Then the epanorama docs say "Do not do this", because it's
> "potentially very dangerous":
> http://www.epanorama.net/documents/groundloop/problem_solving.html

nice link,thanks!

btw, for anyone considering the Radio Shack car audio isolation
transformer - based on the specs, I'd say don't bother.
Frequency Response:...............300 Hz to 4000 Hz +/- 3 dB
http://support.radioshack.com/support_auto/doc9/9542.htm

OTOH, the Ebtech Hum Eliminator looks like a contendor...
2 channels of quality audio isolation for about $60 US retail.
it is reputed (on rec.audio.pro) to saturate easily at low 
frequencies, but good enough to be useful.

then whirlwind has a gadget tailor-made for the laptop audio crowd...
the pcDI - AFAICT it's their Direct2 dual-DI box with an added
stereo 1/8" input and a flashier color box.
supposedly these are quite nice. but pricier - $115 US or so.

-- 

Paul Winkler
http://www.slinkp.com
Look! Up in the sky! It's KING TELEVISION!
(random hero from isometric.spaceninja.com)