Advanced Member level 2
I made a flyback converter and it worked. But the transformer makes loud noise. The switching frequency is 80khz. I also tried 40khz. How can i cut this noise off?
OK, the capacitor you want to increase (try even 100nF) is the 100pF capacitor between the compensation output (COMP) and the feedback input (FB) of the UC3842. If the noise goes away, then you know the loop is oscillating.
Then we'll find a way to remove the oscillation.
What changes did you make in the circuit?