power problem power concept
pwm power dependent on pulse width modulation this done by 2 transistor and component in the circuit rc circuit and photo coupler depend on the output power on 110 divided on 2 resistance r1 r2 and connected to kia123 ic which has rule v out 2.5v = vin r1/r1+r2
you can down load datasheet of it
so vout 110 is the make the control on the pwm by increase v biasing on the transistor or decrease the volt on base of drive transistor which connected by collector to main transistor by resistance
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