Class C Amplifier

A Class C amplifier is not suitable for audio frequency amplification. Here's why:

1. Operation
- A Class C amplifier operates in a highly non-linear region where the input signal is amplified only during a small portion of the input cycle.
- It conducts for less than 50% of the input signal cycle.
- This means that it is highly efficient in terms of power consumption, but it introduces severe distortion in the output waveform.

2. Biasing
- Class C amplifiers are typically biased such that the input signal is amplified during the positive half-cycle of the input waveform.
- The biasing is done in such a way that the output waveform is highly distorted and contains a large amount of harmonic content.
- This distortion is not desirable in audio amplification, as it affects the quality and fidelity of the reproduced sound.

3. Application
- Class C amplifiers are commonly used in RF (Radio Frequency) applications where the input signal is a high-frequency carrier wave.
- They are used in applications such as radio transmitters, oscillators, and RF power amplifiers.
- Due to their high efficiency and ability to generate high power outputs, they are suitable for these applications where the quality of the waveform is not critical.

4. Audio Amplification
- In audio amplification, the input signal is a low-frequency audio waveform that contains various harmonics and complex waveforms.
- Class C amplifiers are not suitable for audio amplification because they introduce severe distortion in the output waveform.
- The distorted output affects the fidelity and quality of the reproduced sound, leading to a poor listening experience.

Therefore, the correct answer is option 'B' - Class C amplifier cannot be used for audio frequency amplification.