The common-emitter amplifier is designed so that a small change in voltage (Vin) changes the small current through the base of the transistor; the transistor's current amplification combined with the properties of the circuit mean that small swings in Vin produce large changes in Vout.

Various configurations of single transistor amplifier are possible, with some providing current gain, some voltage gain, and some both.

Go to the video to watch about transistor as an amplifier presentation.
Now answer the questions and add these to the comment page below the post.

1.      How do we use the transistor as an amplifier?
2.      How the various configurations of single transistor amplifier are possible  ?


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