PAM8403 Digital Audio Amplifier Board with Potentiometer

Description:

Ultra-compact Class‑D stereo amplifier module using the PAM8403 IC. Operates from a 5 V rail and delivers up to 3 W per channel. Ideal for portable or microcontroller-based DIY audio projects needing efficient and clear sound.

Key Features:

• Dual-channel stereo amplifier: 3 W + 3 W output (with 4 Ω speakers at 5 V)
• Operates on 2.5 V to 5.5 V DC (best at 5 V)
• Supports 4 Ω to 8 Ω speaker loads
• High overall efficiency (around 85–90 %) with minimal output filtering required
• Filter‑less architecture: no external LC low‑pass is needed for speaker interface
• Built-in protections: short-circuit, thermal shutdown (~140 °C), under-voltage lockout

Technical Specifications:

Usage Notes:

• Provide a stable 5 V DC supply capable of supplying at least 500 mA for both channels.
• Use 4 Ω speakers for maximum output and volume; 8 Ω speakers reduce power output.
• Avoid input signal voltages above approx. 0.4 V peak-to-peak to prevent clipping.
• Ensure correct polarity; reverse voltage can damage the IC.
• Thermal protection will shut down the amplifier if internal die temperature exceeds ~140 °C.
• Outputs cannot be combined (tie negative channels together), as this may damage the board.