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Duinopeak 20W Stereo Audio Amplifier for Arduino - MAX9744
Pump up the volume with this 20W stereo amplifier! 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's class D£¬ its 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 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 voltageUp to 93% efficient (88-93% typical)20mA quiescent current (or put into shutdown for 1uA quiescent)Up to 29.5dB max gainUse DC or AC coupled line-level input£¬ up to 3VppFilterless Spread-Spectrum Modulation Lowers Radiated RF Emissions from Speaker Cables20W Stereo Output (4Ω£¬ VDD = 12V£¬ THD+N = 10%)Low 0.04% THD+NIntegrated Click-and-Pop SuppressionShort-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.