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Hi,
Do you know why the ringed diode would ever need to be 400V rated? Its a general purpose, SMA, 400V diode.
Why ever do you think they used such a high voltage part?
LTspice and PNG attached.
Thanks, in the schem of #14 it should not , but you never know with stray inductance, and release-of-short-cct etc etc...we are most worried about cathode of the D5 diode going way below ground, due to stray reactance ringing...and thus we are thinking of adding the shown 27V zener.
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