BIPOLAR TRANSISTOR BASICSĪ bipolar transistor (first invented in 1948) is a three-terminal (base, emitter, and collector), current-amplifying device in which a small input current can control the magnitude of a much larger output current. The remaining seven parts of the series will present a wide range of practical bipolar transistor application circuits. This opening episode concentrates on basic transistor theory, characteristics, and circuit configurations. In its discrete form, it can function as either a digital switch or as a linear amplifier, and is available in many low, medium, and high power forms. The bipolar transistor is the most important “active” circuit element used in modern electronics, and it forms the basis of most linear and digital ICs and op-amps, etc.
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