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f-alpha.net » Electronics » Electronics Lab » Electronic Components » Transistors

Transistor

By the term "transistor" one generally thinks mostly of bipolar transistors. Other transistors are identified by an addition to the term (for example: field effect transistor).

Basically there are two types of bipolar transistors, the NPN- and the PNP transistor. This term is derived from the internal structure. Transistors have three terminals:

  • Cathode,
  • Emitter and
  • Base.

Various transistors. (Enlarge)

Circuit symbol NPN transistor.

Circuit symbol PNP transistor.

The terminals are usually not marked on the component. For this you need the data sheets.

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