But if the field collapsing into an open circuit produces 250v, wouldn't forcing it to collapse quicker by using a reverse current source cause this back-emf voltage to spike even higher?? And doesn't that mean the reverse current source must have a voltage greater than 250v to have an effect? -Roman Yep! Richard P -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads