The working principle of the transistor: By inputting a small alternating current, a large static direct current is controlled.
Specific principle: The transistor can continuously monitor the current flowing between the base and the emitter, and can control the current source between the collector and the emitter, so that the current between the base and the emitter is ten to hundreds of times larger, Flow between collector and emitter. In other words, the collector-emitter current is controlled by the base current of the transistor.
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