[TenTec] Century 21 audio hum

Dukes HiFi dukeshifi at comcast.net
Tue May 30 21:52:10 EDT 2017

If a diode were to open up, you’d still have a bridge, it just would not be “refreshed” each half cycle so the filtering would not be as effective.

This is HIGHLY unlikely.


> On May 30, 2017, at 3:55 PM, Josh Gibbs <gibbsjj at gmail.com> wrote:
> Stuart,
> 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
> rectifier?
> Here is what the ripple looks like, measured at the big filter cap:
> https://drive.google.com/open?id=0B_pjAwEfeYcdXzQ5LS1URkx6MjQ
> It's clearly 120Hz, about ~300mV P-P.  The PS is putting out the correct
> voltage. Ripple on the regulated output is nil.
> Thanks,
> -Josh WA7FPV
> On Tue, May 30, 2017 at 1:42 PM, Stuart Rohre <Rohre at arlut.utexas.edu>
> wrote:
>> But if one diode in a bridge rectifier opens up, you have a off balance
>> power supply DC bus.
>> Stuart Rohre
>> K5KVH
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