Adafruit 1752 20W Stereo Amplifier Class D 4-8 Ohm Impedance MAX9744

Adafruit 1752 20W Stereo Amplifier Class D 4-8 Ohm Impedance MAX9744 Description

A 20W stereo Class D amplifier fully assembled and mounted on a breakout board. The amp can drive 2 channels into 4 to 8Ω impedance speakers at 20W each. 5 to 12V DC power to the amplifier is via an onboard DC power jack and there is a 3.5mm stereo jack for stereo line level. The Class D configuration means that the amplifier is completely cool-running, requiring no heat sinks or thermal management and also the amplifier works at around 93% efficiency, making it perfect for portable or battery powered applications.

The amplifier can be controlled by both analog and digital volume controls, using the supplied 1K pot for analog and by connecting to a microcontroller via I²C to get 64-steps of digital volume control. The breakout board features polarity-protection, jacks and terminal blocks, I²C level shifting, and a spot to solder in a volume pot and the kit comes with 3 x 2-pin and 1 x-3 pin terminal blocks, 470µF power filter capacitor and 1K trim pot.

Learning tips and tutorials can be seen at https://learn.adafruit.com.

• Fully assembled
• Power from 4.5 to 14V DC
• 20mA quiescent current
• Up to 29.5dB max gain
• Use DC or AC coupled line-level input, up to 3Vpp
• Filterless spread-spectrum modulation
• Low 0.04% THD+N
• Integrated click-and-pop suppression
• Short-circuit and thermal-overload protection