Yes, transformers do that sort of thing.i found that there is a transformer with 1 primary and 2 secondery coils just like the circuit above also, one of them gives 8v and the other 24v.
You cannot use a bridge rectifier for two different supplies at the same time.but i also noticed that there is only ONE diode bridge for two coils?
hows that possible? or there is a way to convert 2 AC connections via one diode bridge?
I think that you completely misunderstand how that PSU works.
If you want a better explanation, I think that you need to show a schematic of the PSU.