[no subject]

Yep. My mistake. Flyback transformers do run in the low kHz range. If
they are whining, there is physical motion happening somewhere that is
making sound. In general, that is not good. The normal 60 Hz hum is
tolerable by touch. There should be nothing audible.

Capacitors do not make noise under normal operating conditions. However,
one that is about to fail can physically flex the walls and/or end of
the can and make it whine. Many transistors can also whine under powerup
stress. I'm one of the (un)lucky few who can hear electronic equipment
turning on.  Most systems work with harmonics that are out of the normal
hearing range. Some systems have very high frequency sound output. Watch
the dog next time the laptop is turned on and see if his ears twitch and
stay up a second or so after the power switch click. :)
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<li><strong><a name="00358" href="msg00358.html">[ale] OT: Question regarding whining monitors (for you EEs out	there)</a></strong>
<ul><li><em>From:</em> fd0man at gmail.com (Michael Trausch)</li></ul></li>
<li><strong><a name="00362" href="msg00362.html">[ale] OT: Question regarding whining monitors (for you EEs out	there)</a></strong>
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<li><strong><a name="00346" href="msg00346.html">[ale] OT: Question regarding whining monitors (for you EEs out	there)</a></strong>
<ul><li><em>From:</em> jb at sourceillustrated.com (John Wells)</li></ul></li>
<li><strong><a name="00347" href="msg00347.html">[ale] OT: Question regarding whining monitors (for you EEs out	there)</a></strong>
<ul><li><em>From:</em> hbbs at comcast.net (Jeff Hubbs)</li></ul></li>
<li><strong><a name="00352" href="msg00352.html">[ale] OT: Question regarding whining monitors (for you EEs out	there)</a></strong>
<ul><li><em>From:</em> jkinney at localnetsolutions.com (James P. Kinney III)</li></ul></li>
<li><strong><a name="00355" href="msg00355.html">[ale] OT: Question regarding whining monitors (for you EEs out	there)</a></strong>
<ul><li><em>From:</em> dale.h at wa4dsy.net (dale.h at wa4dsy.net)</li></ul></li>
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