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MONOSTABLE Produces a single timed pulse. The length depends on the value of the capacitor and resistor(s) connected to pin 6&7. This monostable uses the 555 I.C. Pin 2 starts the timing cycle when it is connected to 0v. This must be only a short pulse as timing will begin when pin 2 returns high. Pin 3 is the output and can drive any low power device. T = 1.1CR Eg. C = 100uF, R = 100K therefore t = 1.1 x 0.0001F x 100,000 t = 11 seconds Timing Project This circuit has been modified in the following ways. 1. The timing switch has been replaced with a capacitor to produce a brief low pulse when the circuit is switched on 2. The buzzer is placed between pin 3 and +v instead of 0v. This will mean that the buzzer sounds at the end of the timing period, not during it.