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Hi, friends, i want know how work axillary vcc of shematic that i attached hear?


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funciona como fonte regulada de 12volts para alimentar o sg3525 fazer fonte funcionar e depois funcionando a fonte ele se auto alimenta pelo enrolamento do trafo
The 100k resistor initially charges up the 2 capacitors 100uf until the SG chip starts to oscillate, the auxiliary winding will then generate the voltage needed to power the auxiliary supply. The voltage at the auxiliary supply is held constant and regulated by the zener diode and the transistors. The load on the 100K resistor is then taken off as the necessary voltage will be supplied from the auxiliary winding.
Mistique You can find the pdf on the link below the pdf file is on post #13

regards Silvio