Drive it with MOSFETS switched on/off with opto-isolators. They switch sorta slow, but will work fine for this. Use H11F1, its an internal FET, can handle the HV. --Bob At 12:37 AM 9/1/2003 -0400, you wrote: >Does anybody have any good information about high voltage H-bridges? (about >200V @ 4A) > >I was thinking about IGBT but I'm a little fuzzy about how to drive the high >side of the bridge. > >Thanks >-Denny > >-- >http://www.piclist.com hint: The PICList is archived three different >ways. See http://www.piclist.com/#archives for details. -------------- Bob Axtell PIC Hardware & Firmware Dev Tucson, AZ 1-512-219-2363 -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.