In most cases you can assume peak ac to be somewhat less then 2xVCT. So for a 2x18V transformer you get 2x18x2x2=144 (for single bridge). Meaning 200V diodes would be ok. That said go for higher voltage and current if you can afford it.
Okay - say that I would build a 0 / + 80 volt power supply, would I need 80*2*2=320V diodes ?
Sorry for bugging You and I'm greatful for Your help !
BR/
Sorry for bugging You and I'm greatful for Your help !
BR/
For a 0-80 or 40-0-40 transformer, yes that would be correct. 400 volt diodes would be a good idea. You can go lower but at the cost of more heat and shorter lifespan.
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