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Unijunction Transistor

The unijunction transistor (UJT) work like a switch. It doesn't amplify the voltage, it just lets current through or not depending on the in input voltage.

Unijunction transistor UJT disecion

Irrespective of the input voltage on the emitter, a small current will flow between the bases. How ever when the voltage applied to the emitter reaches a certain threshold, the switch is 'flipped' and a large current can flow from the base to the emitter.

Unijunction transistor UJT example

Here is a sample circuit that will flash a LED.

Unijunction transistor UJT circuit


Semiconductors

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AuthorMessage
Anonymous
172		I need to find an atomic model of Iron. Help, anyone?
vvek16@yahoo.com
3		can any one suggest me about practical testing of these electronics components or there is any site related to it.
thanks in advance
vvek16@yahoo.com
3		how to check a thyristor practically using multimeter or tong-tester whether its working or worn out.
tnx in advance
vvek16@yahoo.com
3		how to check a thyristor practically using multimeter or tong-tester whether its working or worn out.
tnx in advance
Anonymous
172		Gotta love those with no job and too much time on their hands. By the way, Anonymous 158, I'll take a #1 with cheese, and TWO packets of Ketchup. Also, sulphur is what is on a match tip. Septic tanks emit methane. It's OK though. You'll learn that when you get to high school, if you don't drop out first. Then again, I'm not sure if they teach chemistry in juvenile hall. It's kind of pointless. After all, for someone who couldn't determine right form wrong, Avogadro's number would be more than they could comprehend. Good luck in life, you'll probably need it. Now I know why I have to pay so much in taxes. I'm getting real tired of paying to support morons.
Anonymous
172		You made a mistake in the p-silicon picture. You missed an h!
clementmambwe
6		what semiconductor is more useful in an audio system circuit and why?
Anonymous
172		This is really helpful thanks.
Anonymous
172		saaaaafeee
Anonymous
172		yoyoyo iz gd thx!
Anonymous
172		so.. how is everyone?
Anonymous
172		lol! @ person below!
Anonymous
172		OMGZ LOLZ I LOVE TRANSISTORS!
they taste better than peanuts and feel great up my ***!
Anonymous
172		otherwise why not "Fosforus"?
Anonymous
172		the word is spelt "Sulphur" for god's sake, whatever the septic tanks try to force on us.
Anonymous
172		Sulfur I think. Anyone?
Bryana
1		Which one of these...Silicon, Phosphorus, Sulfur, Boron, is least likely to be used in semiconductors?
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