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 .
Wide Supply Voltage Range - Operates from 4V to 12V DC, compatible with various power sources
Low Quiescent Current Drain Only 24mW power consumption at 6V supply, making it ideal for portable and batteryoperated projects
The module provides up to 325mW continuous power into an 8Ω load with a 6V supply, suitable for small speakers
Use a 9V battery or 5V USB supply for most Arduino audio projects, with easy 3-wire connections (VCC, GND, IN)
= Key Features =
Variable Voltage Gain - Adjustable from 20 to 200 by adding external components between pins 1 and 8
Integrated Signal Conditioning Selfcentering output quiescent voltage and ground-referenced input for simple operation
Low Total Harmonic Distortion - Only 0.2% THD at 125mW output, ensuring clear sound quality
Multiple Input/Output Options - Supports phono, RCA, 3.5mm jack, and screw terminal connectors for flexible integration
== Applications ==
- Robot human-machine voice interaction and sound amplification
- Portable MP3 player amplifiers and guitar practice amps
- Embedded audio feedback and alarm systems
- 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
- Verify speaker load is at least 8Ω
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
