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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.
555-timer-monostable-multivibrator
