electronics for beginners

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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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Anonymous
220
I just googled the atomic model for iron. There are lots of great sites, here's just one: http://www.chemicalelements.com/elements/fe.html. Good luck.
Anonymous
220
You mean typos, not types. I agree there is a ton of information on this site, it's just choppy. I also agree someone who's primary language is English should proofread and correct all typos. (Not complaining, just stating a fact.) I have learned so much from this site, however, don't feel comfortable referring others here with so many choppy sentences.
Anonymous
220
great site, very informative... there seems to me a ton of types though. this tends to make some things confusing. the site should be proofread.
Anonymous
220
www.delphiuser.net - is a best transistor - delphi related site.
w.harden
2
boron
Anonymous
220
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
220
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
220
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
220
This is really helpful thanks.
Anonymous
220
saaaaafeee
Anonymous
220
yoyoyo iz gd thx!
Anonymous
220
so.. how is everyone?
Anonymous
220
lol! @ person below!
Anonymous
220
OMGZ LOLZ I LOVE TRANSISTORS!
they taste better than peanuts and feel great up my ***!
Anonymous
220
otherwise why not "Fosforus"?
Anonymous
220
the word is spelt "Sulphur" for god's sake, whatever the septic tanks try to force on us.
Anonymous
220
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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