> still in the same thread: I know it's possible to PWM a laser diode > or a laser diode module (just because I've done that) but how reliable > it would be? There are any tricks to not shorten the diode life? Just don't exceed the ratings of the diode. And remember that the diode can be damaged by excessive optical output, not just excessive current. -Bob -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist