Originally posted by PedroGG90
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siemens sitop 24 vdc Smps outputs higher voltage 33 vdc
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Originally posted by CapLeaker View Post
Yes, I know... some of them are a real pain to work on. But in this case I really do think there is a regulation problem as non regulating at all on the feedback and it also does make sense for the voltage to go to the upper limit. The squealing probably comes from the switcher not switching to the designed frequency of the transformer, loaded or not.
Only 2 optocouplers are driving signal from control board.
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Originally posted by CapLeaker View PostSomething has to tell the primary to how much power is needed,
The other optocoupler gets activated from small control board but dont know where it goes after it.
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Originally posted by PedroGG90 View Post
Hi again , i found two optocouplers , one of them seems to be the feedback one , it gets activated from 2 zener diodes coming from output rail capacitor
The other optocoupler gets activated from small control board but dont know where it goes after it.
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