Bjtpower
Full Member level 5
Deal Friends.
I am having an task of Transformerless power supply which can be from 230v ac Mains supply.
I know the Reactance of Capacitor=Xc=V/I
Where V=230*1.41=320V
i=500mA=0.5A
SO,Xc=320/0.5=640 ohm
Now Xc=1/(2*PI*F*C)
Rearranging will give me C=1/(2*3.14*50*640)=1/208998=4.7uF
therefore 4.7uF/400VAC Polyfilm cap i can use..
Is my calculations are right..??
Again, what is value for resistor which can resist 500 mA of current.
i have attached reference circuit which i got from the net.
and i want to do the modifications in the same.
Help
Marx
I am having an task of Transformerless power supply which can be from 230v ac Mains supply.
I know the Reactance of Capacitor=Xc=V/I
Where V=230*1.41=320V
i=500mA=0.5A
SO,Xc=320/0.5=640 ohm
Now Xc=1/(2*PI*F*C)
Rearranging will give me C=1/(2*3.14*50*640)=1/208998=4.7uF
therefore 4.7uF/400VAC Polyfilm cap i can use..
Is my calculations are right..??
Again, what is value for resistor which can resist 500 mA of current.
i have attached reference circuit which i got from the net.
and i want to do the modifications in the same.
Help
Marx