Stereo 20W Class D Audio Amplifier - MAX9744
A compact Class D stereo amplifier breakout based on the Maxim MAX9744. It drives two channels of 4–8 Ω speakers at up to 20 W each, powered from 4.5–14 V DC. With up to 93% efficiency, it runs cool without heatsinks — ideal for portable and battery-powered audio projects.
Volume can be controlled via an included 1 kΩ trim pot (analogue) or via I²C commands from a microcontroller with 64 steps of digital volume adjustment. The board includes polarity protection, audio jacks, terminal blocks, and I²C level shifting.
Key Features
- 20 W Stereo Output – 4 Ω speakers, 12 V supply, THD+N = 10%
- Class D Efficiency – 88–93% typical, no heatsink required
- Power Supply – 4.5 V to 14 V DC via onboard barrel jack
- Audio Input – 3.5 mm stereo headphone jack, up to 3 Vpp (DC or AC coupled)
- Dual Volume Control – Analogue (1 kΩ pot included) or I²C digital (64 steps)
- Max Gain – 29.5 dB
- Low Distortion – 0.04% THD+N
- Low Power – 20 mA quiescent, 1 µA in shutdown mode
- Protection – Short-circuit, thermal overload, and click-and-pop suppression
- Spread-Spectrum Modulation – Reduces radiated RF emissions from speaker cables
Package Contents
- 1× MAX9744 amplifier breakout (SMD components pre-assembled)
- 3× 2-pin terminal blocks
- 1× 3-pin terminal block
- 1× 470 µF power filter capacitor
- 1× 1 kΩ trim pot
Resources
Original: $42.86
-70%$42.86
$12.86Product Information
Product Information
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Shipping & Returns
Description
A compact Class D stereo amplifier breakout based on the Maxim MAX9744. It drives two channels of 4–8 Ω speakers at up to 20 W each, powered from 4.5–14 V DC. With up to 93% efficiency, it runs cool without heatsinks — ideal for portable and battery-powered audio projects.
Volume can be controlled via an included 1 kΩ trim pot (analogue) or via I²C commands from a microcontroller with 64 steps of digital volume adjustment. The board includes polarity protection, audio jacks, terminal blocks, and I²C level shifting.
Key Features
- 20 W Stereo Output – 4 Ω speakers, 12 V supply, THD+N = 10%
- Class D Efficiency – 88–93% typical, no heatsink required
- Power Supply – 4.5 V to 14 V DC via onboard barrel jack
- Audio Input – 3.5 mm stereo headphone jack, up to 3 Vpp (DC or AC coupled)
- Dual Volume Control – Analogue (1 kΩ pot included) or I²C digital (64 steps)
- Max Gain – 29.5 dB
- Low Distortion – 0.04% THD+N
- Low Power – 20 mA quiescent, 1 µA in shutdown mode
- Protection – Short-circuit, thermal overload, and click-and-pop suppression
- Spread-Spectrum Modulation – Reduces radiated RF emissions from speaker cables
Package Contents
- 1× MAX9744 amplifier breakout (SMD components pre-assembled)
- 3× 2-pin terminal blocks
- 1× 3-pin terminal block
- 1× 470 µF power filter capacitor
- 1× 1 kΩ trim pot
