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Old 8th Jul 2020, 12:26 pm   #33
dave cox
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Join Date: Jan 2009
Location: Bristol, UK.
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Default Re: High voltage regulator circuit.

A few more issues ...

Should be a 6V2 zener not 6V8 for best thermal drift, but in any case there is not enough current through it to work properly. Ditto the 30V zener. More current is a problem as its being pulled rather wastefully from 400V. 1V2 shunt regulators are good and cheap (band-gap) BUT that wouldn't leave any headroom for the long tailed pair. Is there a cheap / available ~ 10V shunt regulator ? Or even a 30V ?

Maybe Q2 would get killed by a shorted load

dc
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