Quote Originally Posted by paulus.v View Post
12A*30V = 360VA

With toroidal transformer even 60% of the rated current is safe. This is giving you 10A*30V = 300VA.

In my opinion anything above 300VA is ok. Using large smoothing capacitor(s).
WOW that's embarrassing. I'm putting that mistake down to lack of sleep. Thanks. I'll go for a 500VA then as they aren't too expensive. As for smoothing caps, what is the formula for calculating their size?
I think I read somewhere that its 80000xcurrent/voltage?

So 80000*12A/30V......about 32000uF?