Hi all,
there actually was a problem with my first design, as some folks pointed
out to me:
http://www.jb-electronics.de/tmp/400v_adjustable.png
The PNP transistor (whichever type) will always conduct because the 5V
from the PWM will never lock the transistor, it is by far not close
enough to +400V. I should've seen that.
This is why I added this level shift stage, based on a MPSA42 (Q2) for
example:
http://www.jb-electronics.de/tmp/400v_adjustable_2.png
What do you think?
Best regards,
Jens
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