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Triode, the full name of which should be semiconductor triode, also known as bipolar transistor and crystal triode, is a semiconductor device for controlling current. Its function is to amplify the weak signal into an electrical signal with large amplitude value, and it is also used as a contactless switch.

Triode is one of the basic components of semiconductor. It has the function of current amplification and is the core component of electronic circuit. Triode is to make two PN junctions close to each other on a semiconductor substrate. The two PN junctions divide the whole semiconductor into three parts. The middle part is the base area, and the two sides are the emission area and collector area. The arrangement modes are PNP and NPN.


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