Thanks gents, I see what you mean. Not sure though why the rectifier diodes need to be so heavy. High current I can see, obviously, if the thing is burning (say) 35W continuous then that's just over an amp, day in day out. However I don't get the 200V capability. If you have a 27V secondary I can see how you might need a 54V diode but not 200V. What's the maths on this one?
I'm also unsure how a 22-0-22V secondary will generate 30V rails. 22V is an RMS figure, yes? So the peaks will be over 22V. However they won't generate 30-0-30 rails, will they? Or are you referring to ignoring the centre tap and taking 2 x 22V which after rectification and smoothing might be 30-something V?
Sorry for the dim questions, it's been a long time since my electronics studies.
I'm also unsure how a 22-0-22V secondary will generate 30V rails. 22V is an RMS figure, yes? So the peaks will be over 22V. However they won't generate 30-0-30 rails, will they? Or are you referring to ignoring the centre tap and taking 2 x 22V which after rectification and smoothing might be 30-something V?
Sorry for the dim questions, it's been a long time since my electronics studies.