Self-oscillating-switching-converter

  
Regulation is provided by taking the rectified output of the sense winding and applying it as a bias to the base of Q2 via zener Dl. The collector of Q2 then removes drive from the gate of Ql. Therefore, if the . output voltage should increase, Q2 removes the drive to Ql earlier, shortening the on time, and the output voltage will remain the same.
Self-oscillating-switching-converter - schematic

De outputs are obtained by merely rectifying and filtering secondary windings, as done by D5 and C4.




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