PAM8403 Mini Digital Amplifier Module
5V Class-D Stereo Amplifier with Onboard Potentiometer
The PAM8403 is a Class-D audio amplifier, a fundamentally different and far more efficient approach than the classic Class-AB amplifier design used in older audio gear - rather than continuously varying the output transistors' conduction to reproduce the waveform, which wastes a lot of power as heat, a Class-D amplifier rapidly switches its output fully on and off at a high frequency, with the width of those pulses encoding the audio signal, then relies on the speaker's own natural inertia and a simple output filter to reconstruct a smooth analog waveform from those pulses. This switching approach is why such a tiny chip, running from just 5V, can deliver a genuinely audible few watts per channel into a small speaker while barely getting warm, unlike an equivalent-power linear amplifier which would need a real heatsink. This particular breakout pairs the bare chip with a stereo 3.5mm input jack, screw terminals for a pair of speakers, an onboard volume potentiometer, and a power switch, making it a drop-in mini amplifier board rather than a bare chip needing external support circuitry.
Key features
Class-D Efficiency
Delivers real audio power while running cool, with no heatsink needed.
Stereo Output
Drives two independent speaker channels from one small board.
Onboard Volume Control
A built-in potentiometer sets output level without extra wiring.
3.5mm Audio Input
Plugs directly into any standard headphone-style audio source.
Low Voltage Operation
Runs from a simple 5V USB-style power source.
Compact, Low-Cost Board
Easy to embed into small speaker or media player projects.
