LM386 Audio Amplifier Module
Low-Voltage Sound Amplification Board for DIY and Embedded Projects
The LM386 audio amplifier module is a compact analog sound amplification board built around the popular National Semiconductor LM386 power amplifier IC, designed for battery-powered devices and embedded audio applications [citation:11][citation:1].
Wide Supply Voltage Range - Operates from 4V to 12V DC, compatible with various power sources [citation:12][citation:1]
Low Quiescent Current Drain Only 24mW power consumption at 6V supply, making it ideal for portable and batteryoperated projects [citation:3][citation:8]
The module provides up to 325mW continuous power into an 8Ω load with a 6V supply, suitable for small speakers [citation:1][citation:10]
Use a 9V battery or 5V USB supply for most Arduino audio projects, with easy 3-wire connections (VCC, GND, IN) [citation:7]
Key Features
Variable Voltage Gain - Adjustable from 20 to 200 by adding external components between pins 1 and 8 [citation:3][citation:4]
Integrated Signal Conditioning Selfcentering output quiescent voltage and ground-referenced input for simple operation [citation:4]
Low Total Harmonic Distortion - Only 0.2% THD at 125mW output, ensuring clear sound quality [citation:4][citation:6]
Multiple Input/Output Options - Supports phono, RCA, 3.5mm jack, and screw terminal connectors for flexible integration [citation:6]
= Applications =
- Robot human-machine voice interaction and sound amplification [citation:1][citation:11]
- Portable MP3 player amplifiers and guitar practice amps [citation:6][citation:10]
- Embedded audio feedback and alarm systems [citation:11]
- Battery-powered consumer electronics and prototypes
Versatile Compatibility - Works with Arduino, ESP32, and Raspberry Pi
Low Part Count - Minimum external components required for basic operation
√ Stereo and mono configurations supported
√ Suitable for both through-hole and SMD assembly
Troubleshooting
No output:
- Check supply voltage is between 4V to 12V [citation:12]
- Verify speaker load is at least 8Ω [citation:1]
Distorted sound:
- Reduce input signal amplitude or adjust gain
- Check capacitor values on pins 1, 7, and 8
Excessive heat:
- Ensure proper heat dissipation
- Reduce supply voltage or output power
