Monostable Multivibrator (using op-amp) Explained

In this video, the monostable multivibrator circuit (using op-amp) has been explained.

By watching this video, you will learn the following topics.

0:22 What is Monostable Multivibrator

1:28 Working of the monostable multivibrator

4:48 Design of Monostable Multivibrator Circuit

6:34 Derivation of the equation for the monostable multivibrator

9:38 Use of RC Differentiator circuit for the generation of the trigger signal

What is monostable multivibrator:

In monostable multivibrator, there is one stable state. When the trigger signal is applied then momentarily the output goes into the unstable state and once again comes back into the stable state.

To design this monostable multivibrator circuit using an op-amp, the op-amp is used with the positive feedback.

The time for which the output goes into the unstable state can be given by the expression:

T= RC ln (1 + R2/R1)

Where R1 and R2 are the resistors used with the op-amp in the positive feedback configuration.

The trigger signal which is used to change the state of the monostable multivibrator is a very short duration pulse. And usually, it is generated using the RC differentiator circuit.

In the video, how the trigger signal can be derived using the RC differentiator circuit has been explained. And the expression for the time duration for which the output goes into the unstable state is also derived.

This video will be helpful to all the students of science and engineering in understanding the working of Monostable multivibrator circuit.

#MonostableMultivibrator

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