> On 6/29/05, Harold Hallikainen wrote: >> >> > One obvious way is to use (a) photovoltaic optoisolator(s). >> >> >> I don't they're fast enough and don't have enough output current >> capability to quickly drive the gate, especially considering Miller >> effect. I could be wrong , though (it's been known to happen). >> >> Harold >> > > Not the old-fashioned optos, but the special purpose ones like > HCPL-3140 work great for this. > Thanks! That doesn't appear to be a photovoltaic in that it requires a DC supply on the line side of the opto. If we have lots of channels, that's a lot of floating power supplies. http://cp.literature.agilent.com/litweb/pdf/5989-2138EN.pdf Harold -- FCC Rules Updated Daily at http://www.hallikainen.com -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist