I'm building a clock that will output a pulse every second edit: it's divided by 30 so produces a short pulse every 30 secs. I've ordered a GPS module that outputs a pulse every second. I want to make a circuit that will output a pulse whose duration is the time between the leading edge of the two pulses. The two pulses will always be fairly close (with a few seconds) but neither one can be assumed to be the earliest one. I've had a stab at designing a circuit to do this and I'm asking if it's likely to work or if there is a better way to do this. Any help much appreciated....Circuit attached :
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