Monostable Multivibrator 555 Timer. This is sometimes referred to as a one shot pulse. Monostable multivibrator design using 555 timer ic the capacitor c has to charge through resistance r a.
Consider the 555 timer monostable circuit below. The larger the time constant r a c the longer it takes for the capacitor voltage to reach 2 3v cc. It only needs a few external resistors and capacitors to realize pulse generation and conversion circuits such as multivibrator monostable trigger and schmidt trigger.
When the ic 555 is used as a monostable multivibrator a positive going rectangular pulse is available at the output when a negative going pulse of short duration is applied at the trigger input.
5 th pin is the control voltage pin used to provide external reference voltage to internal comparators. An example of this can be seen with an led and a push button. It is also widely used as a timer in instruments household appliances electronic measurement and automatic control. 4 th pin is the reset pin of 555 timer which is active low so it is connected to vcc to avoid accidental resets.
