The configuration in which the base of the transistor is common between emitter and collector circuit is called a common base configuration. The common base circuit arrangement for NPN and PNP transistor is shown in the figure below. In common base-emitter connection, the input is connected between emitter and base while the output is taken across collector and base.
Different Configurations of Transistors - Common Base, Collector
Different Configurations of Transistors - Common Base, Collector
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