13-09-2013, 02:43 PM
MONOSTABLE MULTIVIBRATOR
Aim:
To design and construct monostable multivibrator using transistor and to plot the
output waveform.
Theory:
Monostable multivibrator has two states which are (i) quasi-stable state and (ii)
stable state. When a trigger input is given to the monostable multivibrator, it switches
between two states. It has resistor coupling with one transistor. The other transistor has
capacitive coupling. The capacitor is used to increase the speed of switching. The
resistor R2 is used to provide negative voltage to the base so that Q1 is OFF and Q2 is
ON. Thus an output square wave is obtained from monostable multivibrator.
Procedure:
1. Connections are made as per the circuit diagram.
2. Switch on the power supply.
3. Observe the output at collector terminals.
4. Trigger Monostable with pulse and note down the output TON, TOFF and voltage
from CRO.
5. Plot the waveform in the graph.
Result:
Thus the monostable multivibrator is designed and constructed using transistor
and its output waveform is plotted.