While reading some of the answers I am not quite sure if the original question was a serious one. Nevertheless, I`ll answer without joking:
1.) After being engaged in industrial design & development as well as educating engineers - I am retired now (I am already in the "7th heaven"). But I always find that it is a challenging and interesting task to read some questions from newcomers/beginners touching some fundamental problems - and to discuss these problems with forum members, sometimes from different view points:
* BJT voltage or current controlled ?,
* are there negative frequencies?,
* ac current through a capacitor?,
* what is a current source?, current source without voltage source?,
* does a circuit oscillate always for unity loop gain?,
* what are complex frequencies?,
* what is the meaning of "real" in electronics?
2.) As a second reason: I try to keep in contact with the english language and to practice it - as good as I can. And in this respect - I have learned already a lot.
LvW
1.) After being engaged in industrial design & development as well as educating engineers - I am retired now (I am already in the "7th heaven"). But I always find that it is a challenging and interesting task to read some questions from newcomers/beginners touching some fundamental problems - and to discuss these problems with forum members, sometimes from different view points:
* BJT voltage or current controlled ?,
* are there negative frequencies?,
* ac current through a capacitor?,
* what is a current source?, current source without voltage source?,
* does a circuit oscillate always for unity loop gain?,
* what are complex frequencies?,
* what is the meaning of "real" in electronics?
2.) As a second reason: I try to keep in contact with the english language and to practice it - as good as I can. And in this respect - I have learned already a lot.
LvW