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Astable Multivibrator (using op-amp) Explained


In this video, the astable multivibrator circuit is designed using the opamp.

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

0:12 What is astable multivibrator?

1:10 Brief introduction of Schmitt Trigger circuit

4:19 Working of Astable Multivibrator Circuit

7:13 Design Example of Astable Multivibrator Circuit

9:17 Derivation of time period/frequency for Astable Multivibrator

Astable Multivibrator

In Astable multivibrator, both states are astable state and output used to change continuously between the two states.

When it is designed using the opamp, the opamp is used with the positive feedback along with resistor and capacitor.

The charging and discharging of capacitor decides the frequency of oscillation of this astable multivibrator.

The time period T of the output square wave is given by the expression

T= 2RC ln {(1+ β)/ (1 β)} ccc; for 50 % duty cycle
where β is the feedback fraction

In this video, the working of the circuit has been explained and the astable multivibrator is designed for 1 kHz frequency.

And the expression of the frequency is also derived at the end.

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

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posted by nakvasimon