[ltp] High Pitched noise

[Bret Comstock Waldow]

--nextPart7021243.sjzEuhr4CS
Content-Type: text/plain;
  charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
Content-Disposition: inline

On Wed, 16 Feb 2005 00:27, chris wrote:
> I finally found out why my laptop emits annoying high pitched noise.
> Recently I am using the laptop's external VGA port for displaying my
> screen, if I run everything on my native screen, it's very quiet even when
> the CPU is at full speed. Maybe this is just happening in my laptop.

? Are you using an external CRT monitor?  The flyback transformer in any CR=
T=20
display (computer monitor, TV, etc.) is close to ultrasonic (some humans=20
can't hear it), but often quite loud nevertheless (puts out a lot of sound=
=20
power) and can actually damage hearing over time.

I'd expect most modern CRT monitors to have done something to shield the no=
ise=20
to prevent hearing damage, but it's still noise you might hear.

Other big coils (transformers) may make noise in the same way - they are,=20
along with what they are intended to be, big electromagnets with alternatin=
g=20
current through them, and thus they may "dance".

--nextPart7021243.sjzEuhr4CS
Content-Type: application/pgp-signature

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.6 (GNU/Linux)

iD8DBQBCEkqT922F8D4woqURAjkNAJ4oJpBiORRT8I0SYLTFI6WMtHFvYgCeOIxy
qSH+50nNRMNEKiaSXvMEEQg=
=VhC/
-----END PGP SIGNATURE-----

--nextPart7021243.sjzEuhr4CS--