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-   -   Feedback? Vote! (http://www.diyaudio.com/forums/solid-state/60661-feedback-vote.html)

Pafi 12th July 2005 10:48 PM

Feedback? Vote!
 
What is your opinion? Is there any feedback in this circuit, or not? Please answer only yes/no!

http://www.hszk.bme.hu/~sp215/kapcs.gif

SY 12th July 2005 10:52 PM

Of course there is. Distortion and source Z are reduced in proportion to gain in common emitter.

Pafi 12th July 2005 11:13 PM

Thanks, although I asked only yes/no answer.

Then next question: Is it neccessary to lead back every circuit to common emitter configuration, or is it allowed to calculate simple way? (I think it is relevant the statement by Einstein: Everything should be made as simple as possible, but not one bit simpler.)

darkfenriz 12th July 2005 11:56 PM

1st:yes
2nd:?

Jorge 13th July 2005 12:11 AM

First: yes

Second: can you state it more clearly?

Pafi 13th July 2005 09:57 AM

I try, but I don't know the english technical terminations (or what the heck).

A transistor can be described as 2 gate(?). For example: 1'st gate: base-emitter, 2'nd gate: collector-emitter. There are network equations, for example:

u1=h11*i1+h12*u2
i2=h21*i1+h22*u2

This is the most common, but not the only way! It can be done with common base or common collector too! My 2'nd question: is there any reason to universally prefer one of these, instead of stereotype? I think there is a reason, why is it useful to use the appropiate one, when circuit can be analized simpler with it.

To be continued, actual example come soon!

Bricolo 13th July 2005 10:04 AM

Yes. There's 100% local feedback in this topology.

With zero beefback, neither local nor global, the gain would be infinite

PMA 13th July 2005 11:26 AM

Re: Feedback? Vote!
 
Quote:

Originally posted by Pafi
What is your opinion? Is there any feedback in this circuit, or not? Please answer only yes/no!

http://www.hszk.bme.hu/~sp215/kapcs.gif

Yes - 100% voltage feedback.

Cortez 13th July 2005 11:40 AM

voltage ? :rolleyes:

PMA 13th July 2005 12:01 PM

Yes, a "textbook" example of the voltage feedback.


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