Adafruit 987 Stereo 3.7W Class D Audio Amplifier

The Adafruit Stereo 3.7W Class D Audio Amplifier features AGC (Automatic Gain Control) and up to 89% efficiency making it ideal for battery powered projects. Optional onboard jumper pins (supplied) let you control the gain quickly and easily though it can be controlled by signals from off the board. There's also a shutdown pin for each channel. 1.0µF capacitors on the input channels make them fully differential, the R- and L- pins can be tied to ground if you don't have differential inputs. The amplifier is intended to drive speakers directly as it outputs 360kHz PWM which the speaker coils average out. That may seem like an odd idea, but the high frequencies cannot be heard. The outputs are Bridge Tied for direct connection to the speakers.

Supplied as a fully assembled board, including the 1.0µF capacitors plus 2 x 2-pin screw terminal blocks for the speaker connections and a strips of 0.1in. male header pins for you to solder as needed.

• 2 x 3.7W into 3Ω 10% THD
• Thermal shutdown, short circuit and over-current protection
• Power supply 2.7 to 5.5V DC
• Based around the MAX98306 amplifier
• Adafruit part no.: 987

Please see our range of speakers or breadboards if you need them, as they are not supplied.

*Customers looking to resell on eBay or Amazon should contact Adafruit directly.