TsAmE said:
Circuit with pullup resistor+capacitor+switch makes the triggering action independent from how log the switch is closed ..
This circuit just generates short pulse on closing contacts, and 100nF is chosen very arbitrary, it can be 47nF, 220nF or anything else ..
I am a bit confused. If you omitted the 0.1µF capacitor and the second 10k resistor, and held the button down, what would happen? Would the output always stay high, since pin 2 would stay low?