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I tried different frequency (~55Khz) and result is exactly the same. I think it is not possible to get any better with heat from transformer... I measured efficiency of ~83% is that acceptable? Also - what themperature rise of transformer is save?

Hello! I had recently build flyback SMPS based on UC3845 chip. It operates correctly - no noise, stable output voltage, full power capable (24V/100W). I have Just one problem: Transformer core (not windings) is heating up (too hot to keep my hand on it) even at power of 50W. operating freq...

Thank You for quick help! Power is currently connected in such a way: (bulb allows transistors to survive, when something goes wrong) Now I can connect grounded scope enywhere i need, and converter has full 220V. First waveforms without buzzing: This is waveform on base of T1(337) or T2 -...

Hello. I'm not sure if section correct, if not please tell me. Since my start with electronics ( I was 10 years old ) I used simply SMPS like LM2575 or so, to power microcontrollers or other stuff - these chips was simple, and resolving any problems took like minutes. Last year I wanted to...