The PAM8403 Amplifier Board with Switch Potentiometer is a compact and efficient Class-D stereo audio amplifier designed for low-power, high-quality sound applications. It integrates a rotary volume control with an ON/OFF switch, allowing easy audio level adjustment and power control without extra circuitry. This board is widely used in DIY Bluetooth speakers, portable audio systems, toys, and embedded sound projects due to its simplicity, efficiency, and clear output.
Core Amplifier Specifications
• Amplifier Type: Class-D stereo audio amplifier
• Amplifier IC: PAM8403
• Channels: 2 (stereo)
• Output Configuration: Differential speaker output
Electrical & Interface
• Operating Voltage: 2.5 V – 5.5 V DC
• Recommended Supply Voltage: 5 V DC
• Audio Input: Analog stereo (L, R, GND)
• Speaker Output: L+, L−, R+, R−
• Load Impedance: 4 Ω – 8 Ω
• Control Interface: Onboard potentiometer with power switch
Performance Characteristics
• High efficiency with very low heat generation
• Clean audio output with low distortion
• Pop-noise suppression on power ON/OFF
• Suitable for battery-powered operation
Physical Characteristics
• Module Type: PCB-mounted amplifier board
• Control Element: Rotary volume knob with switch
• Compact and lightweight design
• Easy enclosure integration
Compatibility
• Bluetooth audio receiver modules
• DFPlayer Mini and MP3 decoder modules
• Arduino and ESP32 audio projects
• Raspberry Pi audio systems (with DAC)
• Portable speaker and sound box projects
Key Advantages
• Integrated volume control and power switch
• No heatsink required
• Simple wiring and quick setup
• Excellent choice for portable audio designs
Technical Insights
• Differential outputs eliminate coupling capacitors
• Audio quality depends on power supply filtering
• Not suitable for high-power or large speakers
• Requires external source for audio signal
Applications
• DIY Bluetooth speakers
• Portable audio amplifiers
• Toys and talking devices
• Embedded audio systems
• Educational electronics projects
Pro Tip
• Use a clean, regulated 5 V supply to avoid noise
• Match speaker impedance for best performance
• Keep audio input cables short
• Mount the potentiometer firmly for durability
Package Includes
• 1 × PAM8403 Amplifier Board with Switch Potentiometer