2 May
2023
2 May
'23
6:54 a.m.
Not quite sure what you mean here. I had advice from a friend to bench test
the control module by providing 14V to the input of the 7812. On the good
PSU I can see the PWM operate, on the bad one the PWM is shutdown.
And what happens if you feed in exactly 12 V on the output of the 7812?
Would the PWM work then? By using a lab supply you could check if the
circuit is sensitive to variation in the 12V supply.
/Mattis
Regards
Rob