I am also thinking of making my own power supply and have no problem building the circuit, but a few questions about design. How accurate are the secondaries in a transformer? I'm asking to see if there will be any premature failure if they are not equal, from one coil working harder than the other. Which is better to connect the secondaries in?, series or parallel as both 25v and 50v are available from many suppliers.

I will be using pm752 drivers which I've had lying around for 2 years. Their datasheet says typical voltage is 48v and max voltage is 75v. In another post I read Gary saying to Jonathan that 72v from a toroidal supply is bit on the high side for the pm-752 driver. When I do the calculation 50 X √2 I get 70.7v. Is this the output I will be getting or are there other factors which bring it down by a few volts.

I don't fancy messing around with windings.

Adil