![]() ![]() You can create a bipolar transistor out of either a thin layer of p-type semiconductor sandwiched between two n-type semiconductors (an n–p–n transistor) or by using a thin layer of n-type semiconductor sandwiched between two p-type semiconductors (a p–n–p transistor). The bipolar junction transistor, which was the first type of transistor to be mass-produced, is made up of two junction diodes. There are two main types of transistors: those that are used as switches, and those that are used as amplifiers.īipolar transistors get their name from the fact that they use both majority and minority carriers in order to conduct. The emitter emits electrons, which is why it’s called the emitter. It’s heavily doped because its primary responsibility is to provide a large number of carriers that will support the flow of electricity. The emitter, which is represented by the letter E, is of moderate size. It’s also larger in size than both the emitter and base. The collector is moderately doped, which means it can handle more carriers than the emitter or base. ![]() The collector is responsible for collecting carriers from the emitter and delivering them to the base. Its doping is light, making it thin and its main purpose is to enable carriers to pass from the emitter to the collector. The base, indicated by the letter B, is the center terminal located between the emitter and the collector. By applying a voltage or current to any one pair of the transistor’s terminals, the current going through the other pair of terminals can be controlled. These terminals help to make a connection to an external circuit and carry the current. ![]() Transistor PartsĪ transistor is typically made up of three layers of semiconductor materials, or more specifically, terminals. It can be used to amplify signals, switch currents, and block currents. A transistor is a three-terminal device used to amplify and control electronic signals. ![]()
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