[TenTec] Century 21 audio hum

Josh Gibbs gibbsjj at gmail.com
Tue May 30 16:55:09 EDT 2017


Aside from pulling the bridge rectifier out and testing each diode, is
there a way to tell if one of the diodes is open? I'm trying to visualize
what having one open diode would do... wouldn't it become a 1/2 wave

Here is what the ripple looks like, measured at the big filter cap:


It's clearly 120Hz, about ~300mV P-P.  The PS is putting out the correct
voltage. Ripple on the regulated output is nil.


-Josh WA7FPV

On Tue, May 30, 2017 at 1:42 PM, Stuart Rohre <Rohre at arlut.utexas.edu>

> But if one diode in a bridge rectifier opens up, you have a off balance
> power supply DC bus.
> Stuart Rohre

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