Definition of Bipolar Junction Transistor (BJT)

The Bipolar Junction Transistor (BJT) is an active device. In simple terms, it is a current controlled valve. The base current (IB) controls the collector current (Ic).

Tuesday, March 17, 2009

Ohmmeters view of the BJT

Clearly a transistor cannot be made on the bench by combining two diodes. (Why is that?) Most ohmmeters not only measure resistance, but also measure the forward voltage drop across a diode. From this perspective you can identify the base and the type of transistor based on the following equivalent circuits.

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