We like the MAX9744 amplifier at the heart of this board because its 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.
Some great stats about the MAX9744
Power from 4.5V-14V DC voltage
Up to 93% efficient (88-93% typical)
20mA quiescent current (or put into shutdown for 1uA quiescent)
Up to 29.5dB max gain
Use DC or AC coupled line-level input, up to 3Vpp
Filterless Spread-Spectrum Modulation Lowers
Radiated RF Emissions from Speaker Cables
20W Stereo Output (4Ω, VDD = 12V, THD+N = 10%)
Low 0.04% THD+N
Integrated Click-and-Pop Suppression
Short-Circuit and Thermal-Overload Protection
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.
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