REVIEW:
Bipolar transistors are so named because the controlled current must go through two types of semiconductor material: P and N. The current consists of both electron and hole flow, in different parts of the transistor.
Bipolar transistors consist of either a P-N-P or an N-P-N semiconductor “sandwich” structure.
The three leads of a bipolar transistor are called the Emitter, Base, and Collector.
Transistors function as current regulators by allowing a small current to control a larger current. The amount of current allowed between collector and emitter is primarily determined by the amount of current moving between base and emitter.
In order for a transistor to properly function as a current regulator, the controlling (base) current and the controlled (collector) currents must be going in the proper directions: meshing additively at the emitter and going against the emitter arrow symbol.

	Created by JC Jardim over 11 years ago

EERI 223 (Bipolar-Junction Transistor) Note on Untitled, created by JC Jardim on 11/09/2013.