Y
[email protected]
- Jan 1, 1970
- 0
hello every body, i have a quistion. Why do we use the common emmiter ?
hello every body, i have a quistion. Why do we use the common emmiter ?
hello every body, i have a quistion. Why do we use the common emmiter ?
hello every body, i have a quistion. Why do we use the common emmiter ?
It's popular because it has both current and voltage gain.
We do also use the common base and the common collector (emitter follower) too
you know.
Graham
John said:But I'm still confused about PNP's. I figure the emitters must be
helium implanted, since they tend to go up.
hello every body, i have a quistion. Why do we use the common emmiter ?
Jon said:Its the only amplifier configuration.
CB is a switch. It is normally to unstable for use as an amplifier(or you
can think of it as an amplifier with positive feedback that saturates or
cuts off the transistor very easily).
CC is a unity gain buffer. It has a high impedence input so that you do not
load the output of whatever your taking(sorta like how a volt meter works...
volt meters would be useless if when you used them they did not give you the
right voltage). Its output is low impedence which means that it can drive a
load.
CE is a relatively stable amplifier. It will take a voltage signal and
amplify it. Here though there is a loading effect. By adding a CC at the
end then you can buffer the amplifier so that you get the best of both
worlds. You get gain from the CE + low loading effects.
CB and CC do not amplify(in the sense of taking a small single and making it
larger) but they have other important properties.
Now this is a roundabout way to force us to do the guy's homework.Jon Slaughter" ([email protected]) said:Its the only amplifier configuration.
CB is a switch. It is normally to unstable for use as an amplifier(or you
can think of it as an amplifier with positive feedback that saturates or
cuts off the transistor very easily).
Its the only amplifier configuration.
CB is a switch. It is normally to unstable for use as an amplifier(or you
can think of it as an amplifier with positive feedback that saturates or
cuts off the transistor very easily).
Jon Slaughter said:Its the only amplifier configuration.
Michael Black said:Now this is a roundabout way to force us to do the guy's homework.
(snip)Jon said:Anyone else want to point out my ignorance and that I must have an IQ of -3?
John Popelish said:(snip)
Don't take it so hard or so personally. I get focused on an idea (often a
completely mistaken tangent) and say something stupid, almost daily. I
have tried (and sometimes it is hard) to just smile and say thank you when
someone points out how silly my contribution was.
You gave us all an opportunity to wax poetic on transistor configurations.
Besides, its a lot more fun to criticize someone than just to dive in and
and write a tutorial. Stick around. You'll get your chance to correct me.
;-)
I seriously thought that was a good answer of yours. Because itBob Myers" ([email protected]) said:Well, I tried in my original response to avoid doing that, but it
looks like some folks just have that overwhelming urge to explain....
I know... sometimes its hurts though!!We all want to know everything and
when someone points out that you don't it stings... and when they make you
feel stupid then its even worse..
Jon said:I know... sometimes its hurts though!!We all want to know everything and
when someone points out that you don't it stings... and when they make you
feel stupid then its even worse..
What sucks is that I just got finished reviewing the damn shit and I should
have known but I completely forgot all the names of the different
configurations ;/ I do understand how the work but unfortunately the book
I'm reading didn't conver CC(or if it did it used a different name or I just
haven't got to it yet).
I really need to get in some practice with some
transistor circuits soon... hopefully I'll be able to play around more with
them later.
I guess I'm more mad at myself than anyone. I hate when I try to be helpful
but end up making it worse.
I should atleast double check what I'm saying to
make sure but I tend to be lazy and just type what ever pops in my mind...
Oh well... no hard feelings![]()
I am dyslexic, and regularly get NPN and PNP substituted for
each other, when describing a circuit. I don't have the
problem with schematics, for some reason.