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LM324

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The LM324 is a quad op-amp chip. According to the jwdonal schematic, revision 2 (NTSC) of the SNES motherboard has one of these chips. There are which circuits the four op-amps inside it are for:

op-amp A, part of the Post-Amplifier or Analog Mixer, for the left stereo channel
op-amp B, part of the Post-Amplifier or Analog Mixer, for the right stereo channel
op-amp C, part of the Pre-Amplifier, for the left stereo channel
op-amp D, part of the Pre-Amplifier, for the right stereo channel

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