In these video I explained PC SMPS stater supply.
DC +330 volt given to darin of main switching MOSFET MTP 3N60 through primary winding of stater supply SM transfer. -330 negative supply (floating negative) directly connected to MOSFET source through 1E5 ohms resistor.
C 945 controller transistor output given to MOSFET gate to controll switching process.
RC 207 diode , 68 k resistor and 2.2 kpf connected drain to + 330 voltage line for protection of EMF (for safety MOSFET).
PC 817 opti coupler ic is for protection from high and low voltage out put of secondary side of SM transformer. these signal send to controller transistor C 945 transistor base .
stater SM transformer having 1 primary winding and 3 winding for secondary, two winding for +5v and +33 v other for main MOSFET controller transistor supply.
secondary side FR 104 diode convert ac into DC, 47 mf 50v capacitor used to filter and stored +33 volt send oscillator IC TL 494 / KA 7500 .
FR 302 diode convert ac to dc 470 mf 16 v
used filter and stored capacitor, then + 5v SB send Mother board controller IC
#electricalgarage
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