I'm looking for a good tutorial that explains how a transistor works. My text book doesnt do a good job. I searched the internet and found this. But I'm questioning the validity of this document. He really mentions some strange things contradicting what I had previously known. I would be grateful if someone could confirm whether it is valid or not. Its only two pages I feel so ashamed - 2 yrs in college and I dont how a transistor really works. All I know is formulas. --thank you.