What is astable multivibrator using transistor?

What is astable multivibrator using transistor?

An Astable Multivibrator or a Free Running Multivibrator is the multivibrator which has no stable states. Its output oscillates continuously between its two unstable states without the aid of external triggering. The time period of each states are determined by Resistor Capacitor ( RC ) time constant.

What is a transistor multivibrator?

A transistor or BJT multivibrator is a two-stage switching circuit that is configured in a cross-coupled manner. This allows each of the active BJT stages to be regeneratively cross-coupled with the other BJT stage, so that one switches ON when the other switches OFF, and vice versa.

What is the application of Astable Multivibrator?

Applications astable multivibrator As a timing oscillator or clock of a computer system. It is also used for a flashing lights, switching and power supply circuits.

How does an transistor multivibrator work?

The basic transistor circuit for an Astable Multivibrator produces a square wave output from a pair of grounded emitter cross-coupled transistors. Both transistors either NPN or PNP, in the multivibrator are biased for linear operation and are operated as Common Emitter Amplifiers with 100% positive feedback.

Which of the following region of transistor is used in the operation of multivibrator circuit?

When a transistor is ON, it works in saturation region and its collector – emitter acts as a short circuit. When a transistor is OFF, it works in cut off region and its collector – emitter acts as an open circuit.

Which diode is used in astable multivibrator?

The diodes D1 and D2 isolate the collector from the capacitor during charging and hence the transistors turn off quickly. A separate RC branch has been provided for each capacitor for charging. Q3 helps in starting the oscillations when the circuit is powered up.

Why Astable Multivibrator is called astable?

Answer. An astable multivibrator is also known as a FREE-RUNNING MULTIVIBRATOR. It is called free-running because it alternates between two different output voltage levels during the time it is on. The output remains at each voltage level for a definite period of time. …

Why we use diode in astable multivibrator?

The improvement in the waveform is achieved by using a diode pair in each collector branch of the transistors. This restricts the direction of current flow for the charging and discharging of the timing capacitors.

What are the applications of Astable Multivibrator?

Applications astable multivibrator

• The astable or free running multivibrator is used as a square wave frequency generator.
• As a timing oscillator or clock of a computer system.
• It is also used for a flashing lights, switching and power supply circuits.

What are applications of Astable Multivibrator?

Applications of Astable Multivibrator Astable multivibrators are used in the applications like pulse position modulation, frequency modulation, etc. as they are simple, reliable and easy to construct. Get electrical articles delivered to your inbox every week.