Re: One swift kick cures all

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#431

From: es... Elliott S. Frank
Date: Mon, 08 Jan 1990 17:35

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In article <13...@mit-amt.MEDIA.MIT.EDU> ad...@media-lab.media.mit.edu (Adam Glass) writes:
>
>Sometimes the screen will start whining in an extrordinarily annoying
>pitch (~10kHz). ... Anyone know why the thing does this?
>
Yeah. It's 15,575 Hz, and its a mechanical vibration in the flyback
transformer.  If the transformer is loose on the yoke, the stress of
the 15575 Hz sawtooth causes it to vibrate.

TV addicts who live with bad TV sets have blocked out this sound.  Me ...
I can't be in the same room with one of the original IBM 3270 displays:
the flyback transformer is a field-replacable part and therefore is not
potted to the tube.

Whine :-)
-- 
Elliott Frank      ...!{hplabs,ames,sun}!amdahl!esf00     (408) 746-6384
               or ....!{bnrmtv,drivax,hoptoad}!amdahl!esf00

[the above opinions are strictly mine, if anyone's.]
[the above signature may or may not be repeated, depending upon some
inscrutable property of the mailer-of-the-week.]

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<299@ns-mx.uiowa.edu> <1108@milton.acs.washington.edu> <1989Dec20.163031.29805@cs.rochester.edu> <1131@unsvax.NEVADA.EDU> <1189@bridge2.ESD.3Com.COM> <3193@iitmax.IIT.EDU> <1330@mit-amt.MEDIA.MIT.EDU>

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Path: mbox-mo1.pugleaf.net!gmdzi!unido!mcsun!uunet!samsung!usc!apple!amdahl!esf00
From: es...@uts.amdahl.com (Elliott S. Frank)
Newsgroups: alt.folklore.computers
Subject: Re: One swift kick cures all
Keywords: Flyback whine
Message-ID: <a7wV02ZY7cHp01@amdahl.uts.amdahl.com>
Date: 8 Jan 90 17:35:28 GMT
References: <299@ns-mx.uiowa.edu> <1108@milton.acs.washington.edu> <1989Dec20.163031.29805@cs.rochester.edu> <1131@unsvax.NEVADA.EDU> <1189@bridge2.ESD.3Com.COM> <3193@iitmax.IIT.EDU> <1330@mit-amt.MEDIA.MIT.EDU>
Reply-To: es...@amdahl.uts.amdahl.com (Elliott S. Frank)
Organization: The Beige Building Full of Bright Engineers, Inc.
Lines: 22
Posted: Mon Jan  8 18:35:28 1990
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