Originally Posted By: michael_d
So the transistors work like flow control valves then? Where do they get their command signal from?



it's called a biasing signal. to forward bias a transistor....

here is a 57min lecture on the topic laugh

http://www.youtube.com/watch?v=PSdHf6yozyc


i skimmed though the lecture, it seems to answer most of the amplifier questions i have been seeing on the board as of late.