Each one corresponds to a layer of the semiconducting material. The three pins of a junction transistor are called the emitter, the base, and the collector. As a result, instead of a single junction, there are two junctions. ![]() While a diode is typically a P-type semiconductor bonded with an N-type semiconductor (P-N), a junction transistor differs slightly consisting of a layer of P-type sandwiched between two N-types (N-P-N) or vice versa (P-N-P). The most common type of transistor, a bipolar junction transistor, is constructed from P-type and N-type semiconductors that were discussed in the Diodes MathApp. How is a transistor made and how does it work? A typical transistor is made up of semiconducting material with three pins to connect to external circuits, but they can also be found embedded in integrated circuits, millions at a time. They can switch electronic signals from one type to another and they can also amplify the signal. Transistors are active components that control the flow of electrons.
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