> PWM high pulse needs to be long enough to allow L1 to draw enough current > but not longer (beware saturation if using this for higher powers.) What is the effect of inductor saturation on the circuit? How do you test for saturation? Bruce Douglas -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads