PAM8403 Mini Power Amplifier Board Key specifications Operating voltage: DC 2.55.5V Maximum output: 3 W per channel x 2 channels into 4 Ω at 5 V Efficiency: 90% Benefits Low voltage operation supports battery and portable projects without a large power supply efficiency up to 90% reduces heat generation and helps extend battery life in portable devices Dualchannel stereo output provides clear, balanced amplification for small speaker setups Simple integration with common lowvoltage audio sources and microcontroller projects Compact, dedicated amplifier board designed for compact audio applications What it does Converts a lowvoltage DC supply into amplified stereo audio for small speakers Delivers up to 3 W of output power per channel under appropriate load, with a 5 V supply reference Compatibility and application notes Works with DC supplies in the 2.5 to 5.5 V range, suitable for batterypowered or USBpowered configurations Ideal for compact DIY projects, portable speakers, small electronics kits, and hobbyist audio experiments Fits into projects where space and power efficiency are important, while still providing useful audio output Practical use scenarios Portable DIY speaker: powered by a 3.7 V to 5 V battery system, delivering stereo sound to small loudspeakers in a compact enclosure Microcontroller or microprocessor audio projects: integrate with lowvoltage audio sources to provide amplified playback for alerts, toys, or educational kits Electronics education kit: demonstrates realworld amplification concepts in a compact, easytouse board Notes Specs reflect the listed operating range and maximum output conditions (5 V supply into 4 Ω load) No additional details beyond the specified model, function, and performance are introduced