The full design is here, as you can see there are already 2 x 1n400x at the begining as protection. however, previously I was told to put also this other diode across the optocoupler as it was a faster diode. Is this correct? should I leave it or remove it?
Let me go through your calculations, CRT is new to me. After I read about it I will post again.
Thanks again pelle
