Adafruit stereo 28w class d audio amplifier i2c control agc adafruit 1712 the adafruit stereo 28w class d audio amplifier features agc automatic gain control and an i2c interface the i2c link lets you control the agc parameters such as the gain compression ratio and others plus it lets you switch each channel on and off theres a shutdown pin to put the amplifier into a hibernate mode where it consumes only a tiny 02microa there are 10microf capacitors on the input channels mak