This circuit is a 2.5 W stereo class D audio power amplifier using LM4663. Feature : Two stereo input selector, Micropower shutdown mode, Stereo headphone amplifier, no heatsink needed, “Click and pop” suppression circuitry, Delta-sigma modulator, high efficiency, single supply. Component : resistor, capacitor, LM4663, speaker, headphone.[national.com]
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