A monostable multivibrator (MMV) often called a one-shot multivibrator, is a pulse generator circuit in which the duration of the pulse is determined by the R-C network,connected externally to the 555 timer . In such a vibrator, one state of output is stable while the other is quasi-stable (unstable). For auto-triggering of output from quasi-stable state to stable state energy is stored by an externally connected capacitor C to a reference level. The time taken in storage determines the pulse width. The transition of output from stable state to quasi-stable state is accomplished by external triggering. The schematic of a 555 timer in monostable mode of operation is shown in figure. Monostable Multivibrator Circuit details Pin 1 is grounded. Trigger input is applied to pin 2. In quiescent condition of output this input is kept at + V CC . To obtain transition of output from stable state to quasi-stable state, a negative-going pulse of narrow width (a width smaller than expected ...