5.1 Surround Decoder V3

This is a simple 5.1 surround sound decoder that extracts surround sound from 2.1 stereo sources. It consists of an NE5532 preamp stage, 2 LM324 4-channel op-amps. 2 of the channels are used as part of the DPM decoder, the rest are used as signal buffers. An LM386 is used as a preamp for the subwoofer/LFE channel.