Sunday, 16 February 2014

Joe Davisson Shocktave

For some reason none of us got my CJ Downbox v2 layout to work. That was a bit of a mystery since the schematic was working correctly on my breadboard, but even though the layout did not have any errors, the flip-flop simply refused to work. I had taken the layout down a long ago and almost forgotten about the whole thing. Until a few nights ago. I was watching some DS9 episodes and skimmed through my ever growing schematics folders. I noticed this one. It's Joe Davisson's Shocktave, dated 2005. This time, as we had one utter failure with the similar design, i decided to build it first and post it if it would work. And what do you know. It works. Low octave fuzz not completely unlike the MXR Bluebox, but with a lot lower parts count. Tracking goes wild very easily, but you can tune the mix control to have quite massive and cool low octave walls with this circuit. Output level doesn't feel luggish, so for all of you who enjoy dirty and noisy low octaves, here you go.


  1. Found a demo clip of this one:

  2. I've built this circuit quite a few times, it is a great one.

  3. I've built this circuit quite a few times, it is a great one.

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  5. hello, IS THERE ANYBODY WILLING TO EXPLAIN HOW THIS CIRCUIT WORKS? :) i simulated it and i don't understand what makes flip-flop section behave like an octaver. does it reset it or what? and how? also i'm willing to discuss how to improve it and post my own schematic which i believe works better (op-amp preamp and some mods). the trouble is, I DON'T LIKE TRACKING, and want to improve it, but don't know how because it can't figure out how it works!

  6. Build it and love it.

    Currently thinking of building this crazy beast that is based off of it.

    1. Heh I just got a PCB the other day from David. Just waiting for my order of PCB mounted pots... hurry up Thailand Post.