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The operation of the circuit is as follows: C1 charges through R1 until the voltage across it reaches the peak point. The emitter current then rises rapidly, discharging C1 through the base 1 region and R3. The sudden rise of current through R3 produces the voltage pulse. When the current falls to IV the UJT switches off and the cycle is repeated.
Wiki User
∙ 16y ago
Wiki User
∙ 11y agoin 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.
Wiki User
∙ 11y agoA 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.
Wiki User
∙ 11y agobecause, it is work on negative resistance region
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What are the applications of ujt?
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.
Does anyone have a schematic for d-cell relaxation oscillator?
Relaxation oscillators just requie a certain voltage range in which to operate, so most any schematic for one will work, providing you have enough D cells to be able to supply the proper voltage.
Operation of UJT and block diagram?
Explaine operation of UJT .
How to genrate sawtooth wave by using ujt?
by connecting the ujt with proper biasing resistors
Why ujt called current controlled negative resistance device?
The On/OFF action in UJT is controlled by emitter current
Ujt relaxation oscillator?
It is sawtooth waweform genrator
What are the applications of ujt?
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.
Applications of ujt other than relaxation oscillator?
It can be used as a Sawtooth wave generator
Why ujt used as an oscillator?
why ujt used as amplifier
What is the basic applicatjon of a ujt?
oscillator
Does anyone have a schematic for d-cell relaxation oscillator?
Relaxation oscillators just requie a certain voltage range in which to operate, so most any schematic for one will work, providing you have enough D cells to be able to supply the proper voltage.
Why crystal oscillator called clap oscillator?
armstron osillator and work
What is the procedure for testing the circuit of UJT relaxation oscillator?
Depends on what you need to know about it. First off, I'd use an oscilloscope. If it's set up correctly and you know how to `count graticules' that's really all you'll need to learn almost everything about your oscillator. IT should show you the wave forms at certain connection points, voltages as well as giving you some indication of the frequency. And if you want to know the current draw, you should probably have some type of milliamp meter on hand, which can usually be found in most miltimeters.
Operation of UJT and block diagram?
Explaine operation of UJT .
How does a signal generator work?
For ac usually is a non linear resistance that can be used to change frequency Or a relaxation oscillator can supply square waves and filter it to get the basic frequency.. piratically all of them needs some kind of positive feedback
Is ujt is a uni polar transistor?
UJT is known as Uni Junction Transistor
How to genrate sawtooth wave by using ujt?
by connecting the ujt with proper biasing resistors
