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PAM8403 digital amplifier board2*3W Class D

K-TECHNICS
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KSh100.00

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The PAM8403 is an ultra-compact, high-efficiency 2-channel x 3W Class D digital audio power amplifier board. It is widely used for DIY portable speakers, Arduino or microcontroller audio projects, and USB-powered sound systems.
Technical Specifications
  • Output Power: 3W + 3W (Dual-channel stereo into a 4Ω load at 5V).
  • Operating Voltage: 2.5V to 5.5V DC (Highly compatible with 5V USB power or a single 3.7V Lithium-ion battery).
  • Efficiency: Up to 90%, meaning it generates very little heat and requires no bulky heatsink.
  • Architecture: Filterless Class D design allows direct speaker connection without external low-pass LC filters.
  • Safety Features: Short-circuit protection, over-temperature shutdown, and under-voltage lockout. 
Pin Configuration Guide
  • Power Input: +5V (or VCC) and GND.
  • Audio Input: L (Left Channel Input), R (Right Channel Input), and GND (Audio Ground reference).
  • Speaker Outputs: Separate L+, L- and R+, R- pins to hook up individual 4Ω to 8Ω small speakers. 
Critical Usage Warnings
⚠️ Do Not Share Speaker Grounds: The left and right channel "negative" (-) speaker outputs must never be connected together or wired to a common ground. Doing so will instantly destroy the PAM8403 IC.
⚠️ Voltage Limits: Never exceed a 5.5V DC supply. Do not power the module using four standard AA dry cells without a regulator, as new batteries can exceed 6.0V and burn out the chip.
⚠️ Connect Speakers First: Always connect the speaker loads before applying power to prevent chip damage.

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