PAM8403 Audio Amplifier Board What it does Small stereo amplifier board (Model: PAM8403) that boosts audio to drive compact speakers. It accepts a lowvoltage supply and provides two independent output channels. Key benefits USBpowered convenience: can be powered directly from a USB power supply for easy, portable setups. Wide operating range: works across 2.5V–5.5V, giving flexibility with common lowvoltage power sources. Reliable stereo output: delivers up to 3W × 2 (measured at 5V into 4Ω), suitable for small desktop or DIY speaker systems. Simple integration: compact PCB design and standard audio inputs make it easy to add amplification to existing projects. Important attributes Model: PAM8403 Function: Stereo audio amplification (two channels) Power/compatibility: USB power supply compatible; operating voltage 2.5V–5.5V Performance: Maximum output 3W per channel at 5V into 4Ω Construction: compact printed circuit board suitable for integration into enclosures and electronic projects Why customers choose this board Quickly improves volume and clarity for small speakers without needing bulky power supplies. Flexible power options allow use in portable designs, embedded systems, and bench projects. Straightforward hookup reduces development time for hobbyists, makers, and audio DIYers. Practical use scenarios DIY desktop speaker upgrade: add clear, compact amplification to bookshelf or small passive speakers using a USB power bank. Raspberry Pi or microcontroller audio projects: provide stereo output for media players, kiosks, or interactive exhibits where lowvoltage power is used. Portable audio systems: integrate into battery or USBpowered enclosures to drive 4Ω speaker pairs for small rooms or listening. Notes and compatibility tips For full rated output use a 5V supply and 4Ω speakers to achieve up to 3W per channel. Ensure speaker impedance and supply voltage stay within the specified ranges (2.5V–5.5V and 4Ω load) for reliable operation.