[AMPS] Zener screen supplies

[Tom Rauch]

> My idea for a solution was to feed the screen through series diodes to
> prevent any arc getting back into the regulator, with a bleed resistor
> to cope with normal current requirements, and take the feedback for
> the regulator from the screen side of the diodes.
> 
> I'm a great fan of simplicity - what's the trick for protecting the
> zener based supply?
> 
> Thanks, Steve

It would be identical to what you would do with a more complex 
regulator. I'd use a series diode string to the screen with a properly 
designed resistance across that diode string for reverse current.

Did you friend have an electrolytic across his zeners? Like near the 
socket?

IMO, an MOV is a waste of time. I'd use a gas discharge tube in 
parallel with an electrolytic IF arcing was a big deal, and the series 
diodes.  
73, Tom W8JI
W8JI@contesting.com 

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