"Learning slag electronic technology self-Notes" - a few small questions and answers about the transistor summary
1. Is the transistor emitter and collector can exchange use, and why?
A: transistor current amplification main function is a long time, in order to obtain a better zoom performance, the emitters of transistors is not symmetrical and the collector of the production process, its structure so it is not symmetrical. If the exchange use, zoom capability will replace the former is much smaller, and the pressure will be much smaller than the capacity. Thus, the transistor emitter and the collector can not use the exchange. There is a special transistor called a triac can exchange use, but it is not symmetrical.
2. Transistor at work, if disconnect the base lead can cause damage to the transistor, and why?
A: When the triode in the enlarged area, the collector is reverse-biased, at this time if the base lead is turned off and the work \ (U_ {CE} \) is large, the collector junction may be due to excessive reverse voltage is breakdown.
3. There are two transistors, a tube, \ (\ overline beta]} = {50, the CBO {} = 0.5uA of I_ \) ; another \ (\ overline {β} = 150, I_ {CBO} = 2μA \) If other parameters are the same, the choice of which tube is good? why?
A: The other parameters are the same case, \ (\ overline beta]} {\) greater temperature stability deteriorates; likewise, \ (the CBO of I_ {} \) greater temperature stability deteriorates. Therefore, the first one is better. In the selection transistor, the magnification is important, but at the same time ensure the magnification, the more important is the stability of the circuit.