Roman Black wrote: > Wonderful! So now you need 200 optos to the "high > side" transistors, 400 HV transistors draped across > 2kV DC supply and just about *any* bias fault or > glitch is going to fry 2 transistors up big time! :o) Whoops, sorry Michael, I just re-read that post and it sounds quite rude and sarcastic and that wasn't my intent. It was meant to be a "cheeky chuckle" about the joys of chasing 400 transistors around a 2kV supply, as an ex-TV guy it seemed amusing when I wrote it. :o} I apologise, sorry dude! -Roman -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.