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    < p > triode, full name should be semiconductor triode, also called < a href = "https://baike.so.com/doc/7001795-7224677.html" "> < / a > bipolar transistor, the transistor, is a kind of control current of the semiconductor devices. Its function is to amplify the weak signal into a larger amplitude &#118alue of the electrical signal, also used as a contactless switch. Triode is one of the basic components of semiconductor, which has the function of current amplification and is the core component of electronic circuit. Triode is made on a semiconductor substrate two PN junction very close to each other, two PN junction the whole semiconductor into three parts, the middle part is the base area, the two sides of the part is the emission area and collecting area, the arrangement of PNP and NPN two.
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