I'm making a simple 555 timer circuit to drive a flyback transformer. The 555 circuit controls an N-Channel mosfet which is what drives the flyback. I have an old receiver mains transformer that I wish to use to power the entire device. It has multiple isolated secondary taps. One of these taps is 12v and the other is a 50v supply.
I want the 12v supply to drive the 555 circuitry and the 50v supply to drive the flyback. I was going to use two full wave rectifiers, one for each supply. But then I figured without some sort of common the mosfet wouldn't work (no voltage potential right?). So can I simply connect the two taps in parallel or series and then that would work fine? I've read other places that this is acceptable to do but I have to then do half wave rectifiers as a full wave causes issues. Is this true? How would this impact the ripple on my rectified DC supplies?