19
Tuned Amplifier
19.1 Introduction
Audio amplifiers are used in radio receivers, tape recorders, television receivers, etc. The audio amplifier amplifies the signal falling in the audio range of 20 Hz to 20 kHz. This audio range of frequency can not be transmitted to distant places as it gets attenuated very fast. This range of frequency can propagate to small distances and the propagated signals from one station will be similar to those from other stations. Hence, the signal transmitted from one station will overlap with the signal of the other station and it will be difficult to extract the desired signal from other similar signals. Thus, we require a circuit that selects a particular station signal and rejects the signals of all other stations. ...
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