I have an application which will be dissipating a significant amount of=20 power through a resistor - for a very short period. Say a dozen or so=20 microseconds. Assuming I don't exceed the current specification, how long of a period=20 can I average the power dissipation over? Is there a way to calculate=20 this? I realize that it will probably depend on the amount of=20 'overpowering' I'm doing... Mainly I want to be sure I'm not going to cook a resistor by dissipating=20 quite a bit of power through it for 20-30us - and have no idea where=20 even to start to validate this from a mathematical/engineering standpoint. -forrest --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .