The Purpose of the Output Inductor in Audio Power Amplifiers
Audio power amplifiers usually separate the last inductor in the output stage transmission chain. The last inductor usually receives the most attention when it comes to power efficiency in a circuit.
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Stability
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Since circuits experience opposition to current, especially where current is changing direction, capacitive reactance or opposition needs to be balanced with inductive reactance. This is done with the help of an output inductor for maximum output to be reached.
Resonance
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Output inductors are used to dampen circuit resonance with the help of a shunt resistor. This is especially important in high frequency circuits where stability is a real issue.
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Output Devices Elimination
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Without a damping output coil, a large number of other output devices such as base stopper resistors will need to be introduced into the circuit to maintain both the local and global circuit stability to acceptable levels.
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