Negative and postive feedback.

[Bassalisk]

Well, this post was just calling me out.

So my past few posts about transistors, and very good people that replied them, told me that I should embrace this new concept of feedback.

We just learned it last week, and I wasn't so excited about it.(meh, just another technique to make transistors even more complicated).

But when I actually went to study it, I found it VERY interesting and very useful technique(or consequence, i don't know how to call it :D).

I have fairly few simple questions.

First:

Is this site legit, or as mr. Claude would call it heresy ?

http://www.opamp-electronics.com/tutorials/feedback_3_04_10.htm"

If not, read on:

[PLAIN]http://pokit.org/get/663797f99b52fd6474a1a901e3a0088a.jpg

See that feedback resistor?

I understand that it controls the transistor's amplification coefficient(not as much as common-collector bias).

But here is what bothers me:

if I put this feedback resistor, do I with resistance control what portion of output signal I am transferring to base-emitter voltage?

Ie. If I had very small feedback resistor, would I transfer too much of output signal to input, and distort the whole thing?I have more questions, just I want to clear this for start.

Thanks

 

[es1]

Same link as in other thread. First read section 2.2, then section 5.6.
http://www.stanford.edu/class/ee122/Handouts/EE113_Course_Notes_Rev0.pdf

I think those notes are really good. Nice of Stanford to provide them.

 

[Bassalisk]

Same link as in other thread. First read section 2.2, then section 5.6.
http://www.stanford.edu/class/ee122/Handouts/EE113_Course_Notes_Rev0.pdf

I think those notes are really good. Nice of Stanford to provide them.

Thank you, I'm on it.

 

[es1]

Actually, I think I have my sections wrong. I got confused because they only give section numbering inside the document.

I meant. First 14:2.2, page 218 and 219.
Then 5.8: page 67 to 74. Especially look at the feedback diagram on page 73.

 

[jim hardy]

good for you!

i am enthisiastic about feedback. once you become aware of it you'll start noticing how Mother Nature uses it everywhere. She LOVES a balance.

will read your link tonite.

meantime, for feedback in nature and a break from electronics::

http://wattsupwiththat.com/2009/06/14/the-thermostat-hypothesis/

note very last comment...