On Sun, Oct 12, 2008 at 12:46:24PM +1300, Jinx wrote: > > Jinx, would a Zetex transister be prefered over a mosfet with a > > suitable Id? > > You'd have to consider Vsat of the transistor and Ron for the FET Thanks for your answer. I built a Joule thief circuit and simply switching out the 2N2222 for a ZTX (I forget the exact device) resulted in a big improvement in output voltage. Zetex transistors seem almost other worldly compared to common BJTs. Matthew -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist