Astable Multivibrator using BJT Explained

In this video, the design of Astable Multivibrator using the transistor (BJT) is explained.
In this video, the operation (working) of the astable multivibrator circuit is explained in detail and in the end, the equation of the frequency of oscillation of the circuit is derived.

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

0:00 Introduction

0:27 What is Astable Multivibrator? (A brief introduction)

2:16 The operation (working) of the Astable Multivibrator when it is powered up.

4:44 The operation (working) of the Astable Multivibrator in the steady-state.

10:00 The derivation of Frequency of Oscillation of Astable Multivibrator.

What is Astable Multivibrator?

Astable multivibrator does not remain stable in any of the two states. And the output of the multivibrator continuously changes between the two states.
This type of multivibrator is used in the design of a relaxation oscillator.

In this video, the Astable Multivibrator is designed using the BJT and its working is explained in detail. And in the end, the expression of the frequency is derived.

The time period of the astable Multivibrator T = 0.693 (Rb1*C2 + Rb2*C2)
(Here the nomenclatures are used as per the video.

If the value of the resistor and capacitor is same for both transistor (Rb1 = Rb2 = R and C1 = C2 = C) then
T ≈ 1.4 RC
And frequency of oscillation f ≈ 0.72 / RC.
In this case, the duty cycle will be 50 percent.

The link for the other useful videos related to the topic:

1) What is Multivibrator?
https://youtu.be/5clfiJtRhR8

2) Transistor As a Switch
https://youtu.be/ILCnR83Gs_U

This video will be useful to everyone in understanding the working of the astable multivibrator when it is designed using the transistor.

#AstableMultivibrator
#AstableMultivibratorUsingBJT

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