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Low-voltage audio power amplifier

LM386 Internal Circuitry

Explore the internal circuitry and functional stages of LM386.

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Inside LM386

Audio input, gain control, bias and power output.

Functional audio input stage feeding internal gain network controlled by pins1and8,then classAB output5. Bias network with bypass7setsoutputnearhalfVS. Supply6andGND4.
Functional explanation of signal flow; not a transistor-level die schematic.

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Select a stage to see its role and connections

Differential input

Pins 2 and 3 accept a small differential audio signal.

Internal feedback

The gain network sets gain 20 without an external feedback resistor.

Biased output stage

A push-pull power stage supplies the load. Its half-supply DC level is removed by the speaker coupling capacitor.

Component view