This is one of the stronger amps based on LM3886 application note. It supports stand-by and mute modes. The schematic is rather complicated, because there are some additional devices in the feedback and there are filters both on the input and on the output.The application note contains two alternative topologies: the first one is simple, the second one contains output DC error correction using a servo feedback. The funny thing is, there’s not just a single servo per channel - there are four of them, one for each power IC.
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