![]() The classification is done based on their frequencies and also based on their mode of operation. The main classification is done based on this mode of operation. But the operating point of a transistor, plays a very important role in determining the efficiency of the amplifier. The applications related to radio frequencies employ radio power amplifiers. This amplification is done in the last stage in audio applications. The Power amplifiers amplify the power level of the signal. Emitter Follower & Darlington Amplifier.Transformer Coupled Class A Power Amplifier.
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