Transistors, Triodes and Amplifiers
A bipolar junction transistor (see figure 10.1) is formed in a single crystal of semiconductor material, and there are two types: n-p-n and p-n-p. Each contains three regions known as the emitter, the base and the collector. When the transistor is used in amplifier circuits the base — emitter junction is forward-biased and the collector — base junction is reverse-biased. The arrow on the circuit symbols points in the direction of conventional current flow (that is, of hole flow). The most widely used type is the n-p-n silicon transistor.
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