Hi all a simple input circuit take a input pulse. And stretches it a bit. (from previous post on pulse stretching.) The input looks like this.. (bad asci art)+5V +--------+ | R(1M) _ ---+ ^ | | | |/c +--->'HC14 pulse in---R(100)-+---| | | |\e C(.1u) _ | | ^ GND+ | GND
100 ohms in series and diodes to the rails. I can then either drive a FET (2n7000) or npn (2n4401) both work fine. The exact width of the output pulse is not critical. Which is more robust?