Hey Dan! Good call!
Guys and gals, Dan has hit upon a common hum causing failure that I had
forgotten to mention!
Yes, one diode out in a bridge, (common rectifier in todays linear or
switchers) and you have a hum generator! Been there done that!
73,
Stuart K5KVH
----- Original Message -----
From: <Dan.Newby@cti-pet.com>
>
> One more thing to check is the bridge rectifier. If one of the diodes has
> opened you will no longer be getting full wave rectification, only half
> wave. So the filter capacitor will then be charged at half the frequency
it
> was. Result is more ripple, possibly your hum problem, and maybe
regulation
> problems.
>
> Just a thought.
>
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