Is it a requirement that Mac users be "good looking" 13292

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I can't quite tell if you're really agreeing or disagreeing but pretending to maybe-agree...

Modems and mainframes and server racks don't generate 30kV either, BTW. Monitors probably have some sort of voltage multiplier circuitry; I wonder if they can generate subharmonics of the switchmode supply fundamental, bringing it into audible range.

That said, I have a piece of equipment in my office which used to generate an awful lot of noise, and it was definitely the switchmode supply. It was the loosely wound transformer (aka inefficient motor), in fact. An engineer from the makers of this equipment was visiting (for another reason) and instantly noticed the noise. He then cannibalized a little capacitor from another obsolete board and soldered it to the supply circuit (maybe across the transformer terminals?) and that almost entirely stopped the noise. I'm guessing the windings bumping into each other were acting as some sort of divide-by-N counter, or a superregenerative receiver, and that adding the capacitor simply damped the parasitic electro-mechanical oscillator enough to quiten it.

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