What Is Multivibrator?

Are you curious to know what is multivibrator? You have come to the right place as I am going to tell you everything about multivibrator in a very simple explanation. Without further discussion let’s begin to know what is multivibrator?

In the vast realm of electronic circuits, the multivibrator stands as a fundamental building block with a wide range of applications. A multivibrator is a versatile circuit that generates alternating pulses or waveforms without requiring an external input signal. In this blog post, we will delve into the concept of the multivibrator, its types, working principles, and its significance in electronic systems.

What Is Multivibrator?

A multivibrator is an electronic circuit that produces alternating output signals in the form of square waves, pulses, or other defined waveforms. It operates in a bistable state, meaning it has two stable states that it can switch between. The transition between these states occurs automatically, allowing the multivibrator to generate a continuous series of pulses or oscillations.

Types Of Multivibrators:

  1. Astable Multivibrator: An astable multivibrator is a free-running circuit that continuously alternates between its two stable states, without the need for any external triggering signal. It generates a continuous series of pulses with equal ON and OFF times. Astable multivibrators are commonly used in applications such as timing circuits, clock generators, and frequency dividers.
  2. Monostable Multivibrator: A monostable multivibrator, also known as a one-shot multivibrator, produces a single output pulse when triggered by an external input signal. The output pulse has a fixed duration, determined by the circuit’s timing components. Monostable multivibrators find applications in areas such as pulse shaping, timing circuits, and event triggering.
  3. Bistable Multivibrator: A bistable multivibrator, also referred to as a flip-flop or a binary cell, has two stable states that it can maintain indefinitely until triggered by an external signal. It remains in the triggered state until it receives another trigger to switch back. Bistable multivibrators are widely used in digital logic circuits, memory circuits, and sequential logic systems.

Working Principles:

Multivibrators typically rely on electronic components such as transistors, capacitors, resistors, and timing elements (such as resistors and capacitors) to generate the desired output signals. The specific arrangement and configuration of these components determine the behavior and characteristics of the multivibrator.

Astable multivibrators utilize feedback networks to trigger the transition between their two stable states. By properly selecting the values of timing components, astable multivibrators can generate pulses of varying frequencies and duty cycles.

Monostable multivibrators incorporate a triggering input to initiate the transition from one stable state to another. Once triggered, the circuit enters a stable state for a predetermined duration before returning to its original state.

Bistable multivibrators use two stable states and rely on external triggering signals to change their state. The triggering signal causes the circuit to switch from one state to the other and remain in that state until another trigger is received.

Applications And Significance:

Multivibrators serve as essential components in various electronic systems and applications, including:

  1. Timing and Clock Circuits: Multivibrators are commonly employed in timing circuits, clock generators, and frequency dividers to control the timing and synchronization of electronic devices.
  2. Pulse Shaping and Waveform Generation: Monostable and astable multivibrators are often used to shape and generate specific pulse waveforms in applications such as data transmission, signal conditioning, and communication systems.
  3. Sequential Logic and Memory Systems: Bistable multivibrators are foundational elements in digital logic circuits, memory systems, and sequential logic circuits, enabling storage, memory, and data manipulation.
  4. Instrumentation and Control Systems: Multivibrators find applications in instrumentation and control systems where precise timing, triggering, and synchronization of electronic signals are crucial.


Multivibrators stand as versatile electronic circuits that generate alternating pulses or waveforms, providing essential functionalities in various electronic systems. Whether in timing circuits, waveform generation, or digital logic systems, the multivibrator’s ability to generate and control electronic signals has far-reaching implications. Understanding the different types of multivibrators and their working principles equips engineers and enthusiasts with powerful tools to design and optimize electronic circuits for a wide range of applications.


What Is The Concept Of Multivibrator?

A MULTIVIBRATOR is an electronic circuit that generates square, rectangular, pulse waveforms, also called nonlinear oscillators or function generators. Multivibrator is basically a two amplifier circuits arranged with regenerative feedback.

What Is An Example Of A Multivibrator?

We’ve already seen one example of a monostable multivibrator in use: the pulse detector used within the circuitry of flip-flops, to enable the latch portion for a brief time when the clock input signal transitions from either low to high or high to low.

What Is The Basic Principle Of Multivibrator?

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.

Is 555 A Multivibrator?

The IC 555 can be made to work as an astable multivibrator with the addition of three external components: two resistors (R1 and R2) and a capacitor (C). The schematic of the IC 555 as an astable multivibrator along with the three external components is shown below.


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