Explore LM386 pins, signal names, electrical functions and connection guidance for each package.
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One end of the internal gain-setting network.
Leave open for gain 20; a 10 µF capacitor from pin 1 to pin 8 raises AC gain to about 200.
Positive capacitor terminal at pin 1.
Ground-referenced inverting signal input.
Connect to signal ground in the non-inverting speaker example.
Ground-referenced audio input.
Feed a small AC signal through the input coupling capacitor.
Keep input excursions inside ±0.4 V.
Input, bypass and power return reference.
Connect to supply negative; keep input returns away from speaker-current paths.
Output sits near half the supply at rest; the audio waveform rides on this DC level.
Use a series output capacitor before the speaker. Connect a 10 Ω + 47 nF series network from output to GND.
Do not connect an ordinary low-impedance speaker directly between this pin and GND.
Supply for the amplifier output and bias circuits.
Use +6 V in this example with local 100 nF and 100 µF bypass capacitors.
4–12 V for the selected -1 variants.
Decoupling access to the internal bias network.
An optional 10 µF capacitor to GND improves supply rejection.
Capacitor positive at pin 7.
The second end of the gain-setting network.
Leave open with pin 1 for gain 20.
A capacitor or series RC between 1 and 8 changes gain; it is not a supply pin.
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