What is an acceptor circuit ? State its use. - Vidyadip

Question

What is an acceptor circuit ? State its use.

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Answer

An acceptor circuit is a series $\text{LCR}$ resonant circuit used in communications and broadcasting to selec$-$tively pass a current for a signal of only the desired frequency.
The resonance curve of a series $\text{LCR}$ resonant circuit with a small resistance exhibits a very sharp peak at a certain frequency called the resonant frequency $f_r.$ For an alternating signal of this frequency, the impedance of the circuit is minimum, equal to $R,$ and the current is maximum. That is, the circuit has a selective property as it prefers to pass a signal of frequency $f_r$ and reject those of other frequencies.
Use : An acceptor circuit is used in a radio or television receiver to accept the signal of a desired broadcasting station or channel from all the signals that arrive concurrently at its antenna. Tuning a receiver means adjusting the acceptor circuit to be resonant at a desired frequency.

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