1752 / MAX9744: 20W x2 @ 8Ω, 5 ~ 12V in, Class D


This slim little board has a class D amplifier onboard that can drive 2 channels of 4-8 ohm impedance speakers at 20W each. Power it with 5-12VDC using the onboard DC power jack and plug stereo line level into the 3.5mm stereo headphone jack and jam out with ease. Since it is class D, it is completely cool running, no heat sinks are required and it's extremely efficient - up to 93% efficiency makes it great for portable or battery powered rigs.

We like the MAX9744 amplifier at the heart of this board because it is very easy to use, but it also has both analog and digital volume control capability. Use a single 1KΩ pot (we include one) to adjust volume analog-style. Or hook it up to your favorite microcontroller and send I2C commands to set 64-steps of volume amplification.

We took this lovely chip and wrapped it up into a breakout for you, with polarity-protection, jacks and terminal blocks, I2C level shifting, and a spot to solder in a volume pot. Each order comes with one MAX9744 breakout board with all surface-mount parts fully assembled and tested. We also include 3 x 2 pin and 1 x 3 pin terminal blocks, a 470uF power filter capacitor and 1KΩ trim pot. To use this board, a little soldering is required to attach the terminal blocks and other components, but it is fairly easy and expect it should take less than 15 minutes.


Manufacturer Maxim Integrated
Category Audio Amplifiers
Eval Board Part Number 1528-1031-ND
Eval Board Supplier Adafruit Industries LLC
Eval Board Normally In Stock
Amplifier Type Class D
Number of Outputs Stereo
Output Power (RMS) @ Load 20 W x 2 @ 8 Ω
Voltage In 5 ~ 12 V
THD+N (1kHz) @ Conditions < 0.04% @ 5 W (8 Ω)
Features Click and Pop Suppression
Digital Gain
I²C Interface
Short Circuit Protection
Shutdown, Enable, Standby
Thermal Protection
Efficiency @ Conditions >80%, 5V in, 0.2 ~ 3 W @ 4 Ω
>80%, 12V in, 3 ~ 16 W @ 4 Ω
>80%, 12V in, 0.8 ~ 10 W @ 8 Ω
Component Count + Extras 46 + 8
Design Author Adafruit
Application / Target Market LCD TV / Monitor
Powered Speakers
Standby Current [Typical] 100 nA
Quiescent Current [Typical] 10 mA
Standby Current [Maximum] 1 µA
Quiescent Current [Maximum] 20 mA
Main I.C. Base Part MAX9744
Date Created By Author 2014-02
Date Added To Library 2015-05

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