Hi Alain,

Maybe.... but the name problem is to insulate all the circuit from the high voltage side. The OPamp has to be supplied on this HV side, so you need low voltage supply which MUST be HV insulated.

Maybe the Alegro can be adequate if its output is amplified to a level that can be handled by the PIC?

Corsican greetings ...

Quote Originally Posted by Acetronics
Hi, TK5

The best for that voltage levels ( !!! ) is to use a little shunt, an AOP and a V/F converter, then drive an opto-isolator or better an opto-fiber coupler ... remember only CNY21 like HV optocouplers are safe, here ...

on the other side Freq = Current, so it's easy for a PIC to display that !!!

Alain