Hi,
I have a 12-0-12V 250mA transformer in operation from the mains supply.
The circuit diagram is attached and I've double checked - it's wired up exactly the same. The capacitors are 50v 2200uF.
3 of the four capacitors heat up within a few seconds and the tops are beginning to bulge slightly. The only one that appears to be ok is the first one between 0 and +15. The output between 0 and +15 is about 16.4V - correct (the boxes represent fixed 15V regulators which haven't been installed yet). The output between 0 and -15 is only about 6.3V.
It may be worth noting that for a few seconds the second capacitor between 0 and +15 was connected in reverse (the positive side on the 0V rail).
Can anyone identify where I might be having a problem?
Thanks,
Mark