A bipolar junction transistor (BJT) is a fundamental building block of modern electronics. It is a three-terminal semiconductor device that allows a small current at its base to control a much larger current between its collector and emitter, thus a… Continue reading

A bipolar junction transistor (BJT) is a fundamental building block of modern electronics. It is a three-terminal semiconductor device that allows a small current at its base to control a much larger current between its collector and emitter, thus acting as an amplifier or electronic switch. BJTs are made of two types: pnp and npn, which refers to the doping of the three layers of semiconductor material that make them up.
Here are the main parts of a BJT:

Base: The thin middle layer, which is lightly doped.
Collector: The largest and most heavily doped region.
Emitter: Moderately doped and acts as the source of charge carriers.
By applying a small voltage to the base, the flow of current between the collector and emitter can be precisely controlled. This makes BJTs incredibly versatile components, used in a wide range of electronic devices, from simple amplifiers to complex integrated circuits.
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