Monostable Multivibrator Using 555 Timer Graph. As the name specifies a monostable multivibrator has only one stable state. This results to an output frequency being lower than the input frequency.
4 th pin is the reset pin of 555 timer which is active low so it is connected to vcc to avoid accidental resets. By using this circuit we can find the duration of the pulse easily. This is a frequency divider using the 555 timer in monostable mode more appropriately the 555 is operating as a nonretriggerable multivibrator.
8 th pin and 1 st pin of the 555 timer are used to given power vcc and ground respectively.
The 555 timer chip is extremely robust and stable 8 pin device that can be operated either as a very accurate monostable bistable or astable multivibrator to produce a variety of applications such as one shot or delay timers pulse generation led and lamp flashers alarms and tone generation logic clocks frequency division power supplies and converters etc in fact any circuit that requires some form of time control as the list is endless. Once a nonretriggerable multivibrator responds to a trigger subsequent triggers while the output is active will be ignored. The green led shown on the illustration lights when the 555 output is high i e switched to vcc and the red led lights when the 555 output is low switched to ground. For auto triggering of output from quasi stable state to stable state energy is stored by an externally connected capaci tor c to a reference level.
