What Is the LM386? Audio Power Amplifier: Pinout and Uses
The LM386 is a low-voltage, low-power audio power amplifier. From a single 4–12 V supply it drives a speaker with few parts (~0.3–1 W); the gain is 20 by default and adjustable to 200 via pins 1-8. It is the classic of radio/toy/simple amp projects. Pinout DIP-8: 1&8 GAIN, 2 −IN, 3 +IN, 4 GND, 5 OUTPUT, 6 Vs, 7 BYPASS.
The LM386 is a low-voltage, low-power audio power amplifier. Because it can drive a speaker with few external parts, it is the classic IC of hobby audio projects. For the concept, see what is an audio amplifier.
What is the LM386 used for?
Driving small speakers (radios, toys, buzzers, simple amps), amplifying a microphone/audio signal. It runs from a single supply (4–12 V); the default gain is 20 and can be raised to 200 by adding a capacitor/resistor between pins 1-8.
LM386 pinout (DIP-8)
| Pin | Function |
|---|---|
| 1 | GAIN |
| 2 | −IN (inverting input) |
| 3 | +IN (non-inverting input) |
| 4 | GND |
| 5 | OUTPUT (to speaker) |
| 6 | Vs (supply) |
| 7 | BYPASS |
| 8 | GAIN |
Specifications
| Parameter | Value |
|---|---|
| Type | Mono audio power amplifier |
| Power | ~0.3–1 W |
| Gain | 20 (default) – 200 (adjustable) |
| Supply | 4–12 V (single) |
Watch out
An output coupling capacitor and usually a Zobel network (RC) provide stability. If the input audio is weak, an op-amp preamp (NE5532/TL072) can be used first. Watch for oscillation/hum at high gain.
Equivalents
- PAM8403: class-D, more efficient/powerful (stereo).
- TDA2030: a higher-power (14 W) amp.
- LM380: a similar classic audio amp.
Find it in our catalog
Use the LM386 search.