PAM8403 Mini Power Amplifier Board Key benefits Efficient stereo amplification with efficiency up to 90 percent, helping minimize heat in compact audio projects. Wide supply range enables battery or USB powered setups (DC 2.5 V to 5.5 V). Compact, mini board designed for easy integration into small speakers and DIY audio devices. Directly suitable for driving small speakers from a microcontroller or DAC output with minimal external components. Core specifications Model: PAM8403 Mini Power Amplifier Board Operating voltage: DC 2.5–5.5 V Max output: 3 W per channel into 4 Ω (3 Wx2) at 5 V supply Efficiency: up to 90% What it does Provides stereo audio amplification suitable for compact speaker projects and embedded audio applications. Delivers up to 3 W per channel into a 4 Ω load when powered from a 5 V supply, enabling clear, audible sound in small form factors. Practical use scenarios Portable batterypowered speaker: Power from a USB power bank or 5 V supply to drive a compact stereo speaker for onthego listening. Desktop or DIY audio project: Upgrade a small computer or DIY audio project with a robust stereo amplifier capable of driving standard 4 Ω speakers. Embedded electronics with DAC output: Pair with a microcontroller or Raspberry Pi DAC to add amplified audio output to projects and prototypes.