A tripolar tube, full name should be a semiconductor tripolar tube, also known as a bipolar transistor, transistor, is a semiconductor device that controls current. Its function is to enlarge the weak signal into a large amplitude electrical signal, which is also used as a contactless switch.
The tripolar tube is one of the basic components of semiconductor, which has the function of current amplification and is the core component of electronic circuit. The tripolar tube is made on a semiconductor substing two very close PN knots, two PN knots divide the whole semiconductor into three parts, the middle part is the base area, the two sides are the emission zone and the power collection area, arranged in PNP and NPN two ways.
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