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.
======


"Rono" wrote in message
...
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.