You can see my full build thread HERE
There are two awesome TTSH threads in Muffs.
2600 clone - Two Thousand Six Hundred (TTSH)
and
Two Thousand Six Hundred (TTSH) Project General Build Thread
The DSL-Man site has a very good TTSH thread
And of course the official build thread is here
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The Mixer section before components.
A little on how it works
The mixer circuit looks like it uses a standard Op-amp inverting config.
Signals enter the mixer through sliders R200(100K log) & R201 (100K log).. then through R202(100k) & 203(100K). They enter the first LM301 op-amp via pin 2.(in the schematic it's identified as A25).
The signal leaving A25 goes to the pan slider & reverb.
The right channel passes through R256(100k) into pin 2 (inverting input) of A27 (LM301 op-amp).
The left channel passes through R255(100k) into pin 2 of A26 (LM301).
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So basically op-amp A25 inverts the initial input signal.
Then op-amps A26 & A27 re-invert, buffer & amplify it for output to the left & right channels.
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