Common Emitter Configuration for Audio Signal Amplification

The common emitter configuration is the most commonly used configuration for audio signal amplification. This configuration provides high voltage gain and high current gain.

Explanation:

1. Common Base Configuration:
This configuration is not suitable for audio signal amplification because of the low input impedance, low voltage gain and high output impedance.

2. Common Collector Configuration:
This configuration is also known as the emitter follower. It has a high input impedance, low output impedance and unity voltage gain. Although it provides current gain, it does not provide voltage gain, which is required for audio signal amplification.

3. Common Emitter Configuration:
This configuration is the most commonly used configuration for audio signal amplification. In this configuration, the input signal is applied to the base, the output is taken from the collector, and the emitter is grounded. The common emitter configuration provides high voltage gain and high current gain. It has a moderate input impedance and high output impedance.

Advantages of Common Emitter Configuration:

1. High Voltage Gain: The common emitter configuration provides high voltage gain. This is because the input impedance is low and the output impedance is high.

2. High Current Gain: The common emitter configuration provides high current gain. This is because the collector current is proportional to the base current.

3. Moderate Input Impedance: The common emitter configuration has a moderate input impedance. This is because the base is biased at a fixed voltage.

4. High Output Impedance: The common emitter configuration has a high output impedance. This is because the collector is biased at a fixed voltage.

Conclusion:

In conclusion, the common emitter configuration is the most suitable configuration for audio signal amplification because of its high voltage gain and high current gain. It also has a moderate input impedance and high output impedance, which makes it suitable for driving low impedance loads such as speakers.

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