Electronics Engineering

Why ujt used as an oscillator?

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Answered 2014-10-15 13:00:04

why ujt used as amplifier

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The main application of the U.J.T is it is used as relaxation oscillator

It can be used as a Sawtooth wave generator

because, it is work on negative resistance region

It is sawtooth waweform genrator

The simplest application of a UJT is as a relaxation oscillator, which is defined as one in which a capacitor is charged gradually and then discharged rapidly.

A relaxation oscillator is the one which consists of an RC network,in which the capacitor is charged from a DC fixed voltage source, through a resistor. see the link below. the capacitor is charged through the resistor Re. That is why a ujt can be called a relaxation oscillator.

in this circuit a capactor charges until the stand off voltage of the ujt is reached and the ujt shuts off causing the capactor to discharge. The time is controlled by the RC time constant of the RC circuit. So what really happens in the ujt conducts and allow the capacator to charge until the ujt shuts off and then the capactor discharges the cycle repaeats itself over and over because as the capactor discharges the ujt will again turn on allowing the capacator to charge. It is an saw tooth waveform generator.

astable blocking oscillator

a crystal 32.768kHz oscillator.

A Wein Bridge Oscillator is a oscillator which is used for the measurement of Audio Frequency.

Crystal Oscillators are more stable oscillator. and used as Local Oscillator in Radio Receivers

Explaine operation of UJT .

The oscillator which is blocked by using transformer is called a blocking oscillator. Generally, the primary is given to the base and secondary is given to the collector of the transistor used in the oscillator circuit.

UJT is an abbreviation for (Unijunction Transistor) the electronic component that is at the heart of a simple timing circuit. A UJT timer is a circuit used in an electonic system to deliver a specific time. For instance, a 30 second UJT timer might be used to turn on a Green traffic signal for 30 seconds, then turn off. UJT is a specifically cheap way of doing this type of timed signal. Timers using UJTs have largely be superseded by timers based on a 555 integrated circuit.

UJT is known as Uni Junction Transistor

No we can not use it as amplfire .... it is used for switch on and off ... and frequency generator oscelator

UJT(UNIJUNCTION TRANSISTOR) is a three-lead electronic-semiconductor device with only one junction that exclusively as an eletrically controlled swtich andit is not used as a linear amplifier.

An amplifier becomes an oscillator when positive feedback is applied. It is the simple way to do it.

A generator is used to convert mechanical energy to electrical energy. An oscillator is used to convert dc to ac

by connecting the ujt with proper biasing resistors

Phase-shift oscillator Armstrong oscillator Cross-coupled LC oscillator RC oscillator

any circuit which is used to generate an ac voltage without an ac input signal is called an oscillator.

UJT is unijunction transistor where as BJT is bi- junction transistor.

For many people the letters UJT stand for Unitary Junction Transistor.

There are many different types of oscillator circuits, the majority of which use positive feedback.

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