Where should I use resistor in this ?

Are you trying to create a dual DC supply out of an AC supply? The image is not at all readable. Is your source actually a transformer?

Thread Starter


Joined Nov 19, 2009
yes,it is simple just my teacher ask me why should we use resistor in this circuit. (I mean 27ohm)
input is AC 7.3rms 50HZ (sinc)
Last edited:


Joined Nov 4, 2008
Where should I use resistor in this ?
I want to why? Can I remove them?

That's a voltage doubler circuit. The resistors are probably there to reduce the inrush current if the capacitors are fully discharged. Without knowing the value of the capacitors, it's hard to say if you really need the resistors or not.