Stereo 20W Class D Audio Amplifier - MAX9744
20 W per channel stereo Class D amplifier breakout based on the MAX9744, powered 5–12 VDC via DC jack, with 3.5 mm stereo line input. Supports analog volume via 1 kΩ pot (included) or 64-step I2C digital volume control. Up to 93% efficiency.
Pinout
- VDD
5-12VDC board power after polarity protection, from terminal block/DC jack; source says it can power other projects that can handle 5-12VDC input.
Type · powerVoltage · 5-12VDC - GND
Power ground / digital ground for the amplifier board.
Type · groundVoltage · 0V - AGND
Analogue reference ground, described by Adafruit as the quieter ground for audio signal referencing.
Type · groundVoltage · 0V - RIN
Right-channel audio input; duplicate of the right-channel audio input terminal block.
Type · signal - LIN
Left-channel audio input; duplicate of the left-channel audio input terminal block.
Type · signal
Start wiring
I2S · I2C · Analog · 3.3 – 5 V · Breakout
Confirm the data interface matches your host board.
Module pins: VDD, Vi2c, GND, AGND, RIN, LIN, LEFT audio terminal, RIGHT audio terminal. Schematik maps them to your board in the app.
Amplifiers
15 other optionsMAX98357A and MAX98357 I2S class-D amps, PAM8403 and TPA2012 analog stereo amps, MAX9744 20W stereo amp, LM386 and PAM8302 mono amps, and discrete op-amp packs for signal-level work.
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