I'd like a to make a pulse stretcher.. with a pulse output of ~100ms (I might need less.) I've got a few unused gates, 74HC14 and Nand gate. So the "standard" diode, R and C.
For long times (and short input pulse times) I need a small C and big R. I need the input pulse long enough to discharge the cap, given the max current of the IC (~10-20 mA) I need C of 10 nF and R = 10 meg ohm.
Am I asking for problems with such a big R? (Or what's the input bias current of a 74HC14?) This will be in room temp conditions.
For fun I tried 100 meg and 1 nF. It worked fine on the bench.
George H.