Monday, 18 August 2014

TTSH (ARP 2600 clone) build notes - Mixer & Reverb (DIY)

This is part 13 of my TTSH (Two thousand six hundred) build which is an ARP 2600 clone synth.

You can see my full build thread HERE

There are two awesome TTSH threads in Muffs.
2600 clone - Two Thousand Six Hundred (TTSH)
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
  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.

At the pan slider the signal again splits into left & right channels.
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).
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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