PWM power supplies!!

Has anyone built a device to "listen" to pulse width modulated power supplies? My hearing is getting bad, & I can't hear the "chirp" on plugin in T.V.'s for example! Rono.

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I use a scope, and DMV to troubleshoot them. With my hearing, I could never hear one of these. I am sure that the dog or cat can!

Jerry G.
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Jerry G.


Many of them operate at 50KHz or more, even with flawless hearing you wouldn't hear them.

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James Sweet

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