This electronic circuit project is a very simple class D amplifier that will provide a maximum output power up to 3.2W . This Class D amplifier is based on MAX98304 amplifier IC and provides Class AB audio performance with Class D efficiency.This device offers five selectable gain settings (0dB, 3dB, 6dB, 9dB, and 12dB) set by a single gain-select input (GAIN).Active emissions-limiting, edge-rate, and overshoot control circuitry greatly reduces EMI.
This Class D amplifier features click-and-pop suppression that reduces audible transients on startup and shutdown.The amplifier includes thermal overload and short-circuit protection.The MAX98304's 0.95mA at 3.7V (1.2mA at 5V) quiescent current extends battery life in portable applications.
The circuit can be powered from an input voltage range between 2.5 and 5.5 volts DC .
As you can see in the circuit diagram these amplifier circuit require extreme low external parts and thanks to low power consumption and to its small package these circuit can be used in portable audio applications like : mp3 players, cellular phones , etc.