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Question about amplifier


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  • 1 month later...

You can look at spec's for audio power amp ICs.
A little LM386 gives 300mW to an 8 ohm speaker and has a quiescent current of 4mA.
A car radio power amp gives 4W to a 4 ohm speaker and has a quiescent current of about 30mA.
A higher power home stereo amp gives about 70W to an 8 ohm speaker and has a quiescent current of about 60mA.

The idle current in the output complementary emitter follower transistors is adjusted to eliminate crossover distortion.

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