Astable Multivibrator: Working Principles Using Transistor, Its Advantages and Applications

The basic principle of the Astable multivibrator is a slight variation in the electrical properties or characteristics of the transistor. This difference causes one transistor turn ON fast than the other when power is applied for the first time, thereby triggering oscillations.

The multivibrator is an electronics circuit that is use to generator non sinusoidal wave. It uses two stage of amplifier with positive feedback and the circuit is made up of both active and passive component. The active components are like transistor such as bipolar junction transistor or field effect transistor, operational amplifier Vacuum Tubes and 555 timer ICs. In this tutorial we are going to discuss about the astable multivibratior with operation using bipolar junction transistor.

ASTABLE MULTIVIBRATOR

An astable multivibrator has no stable state; it means this multivibrator changes the output over a time period automatically. As a result this produces a square wave continuously at output terminal without any disturbance. The time period of square wave is determined by the RC time constants. Unlike the Monostable Multivibrator or the Bistable Multivibrator use an external triggering pulse for working but it doesn’t required any trigger pulses only required DC supply.

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