Explain with the help of appropriate diagram, how extremely high current gain can be obtained using the Darlington pair configuration of BJT.

The Darlington pair configuration is a combination of two bipolar junction transistors (BJTs) connected in a way that results in an extremely high current gain. This configuration consists of two transistors, typically NPN or PNP, where the emitter of the first transistor is connected to the base of the second, and the collector of both transistors is connected together.

In the Darlington pair, the first transistor (Q1) amplifies the input ________ ____ ____ ________ ____ _________.
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