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I have tried Pspice lots of time but it always gave me an error. Pspice is really annoying software. I connected all components but it always says that unmodelled connected pin etc, even unconnected optocoupler base pin and UC3825's Rt and Ct pins. Another one, psim is really nice but when i need to have 370VDC output, simulation gives me between 120VDC and 200VDC. I am an electrical engineer but i cannot design any f.king sh.t. I've been always reading textbooks but they gave me nothing i think. I dont know how to design feedback network with optocoupler and TL431 since i need isolation and i calculate output choke and capacitor but psim gives me really different waveforms than i expect. Sorry for bad words. I think i will able to understand feedback network and other s.its when i am 50 yo. Now i am 25 yo =)