I use 2N7000's w/no gate resistors. Actually changed from 2N2222A's =20 to get rid of the resistors. What are the "weird observations"? Cheers, -Neil. Quoting David : > All, > > I have been going round in circles today considering how to drive a > logic level FET. I have tried a few things on breadboard but don't > trust the results, many of the weird observations could be to do with > the breadboard. > > I wish to drive a IR LED at 40khz (essentially the Sony IR protocol), > somewhere between 50mA and 100mA max LED Ifwd. In testing I have been > using a 2N7000. > > I am confused around whether or not to use resistors, there is a lot of > conflicting advice online. The options seem roughly to be: > > ... --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .