What components are used for a simple monostable circuit?
at the link below there is a simple circuit diagram with a monostable multivibrator circuit When triggered by an input pulse, a monostable multivibrator will switch to its unstable position for a period of time, and then return to its stable state. The time period monostable multivibrator remains in unstable state is given by t = ln(2)R2C1. If repeated application of the input pulse maintains the circuit in the unstable state, it is called a retriggerable monostable. If further trigger pulses do not affect the period, the circuit is a non-retriggerable multivibrator. the second link shows a monostable circuit with NAND logic gates and explains how the circuit works.