Thursday, 29 March 2012

Skreddy Cognitive Dissonance MKIII

Updated 11th May 2013: I wasn't happy with this layout and so re-jigged it a bit

Marc's description of the original:

Classic Smooth, Creamy Distortion

Powerful and high gain while fairly tight and articulate, this fuzz pedal's versatility lends it to many different musical applications; it's not voiced after any particular genre or artist.

Even while creating a wall of fuzz, the Cognitive Dissonance MKIII retains excellent string separation in chords. Lower sustain knob settings are articulate; not too mushy, doesn't destroy your attack.

Sounds so good, it's addictive

Kick it on and you'll instantly be inspired by this vintage-style, 4-silicon-transistor distortion/fuzz/sustain stompbox.  The Cognitive Dissonance's™ meaty tone comes as a result of years of research and experience in fuzz design evolution, and it features parts you probably won't find in other pedal-makers' boxes.

The Scoop/Flat switch shifts the midrange content from lightly mid-scooped to just enough more mids to fill in the vocal frequency range in a natural way without altering the fundamental character.

Geiri's build:


  1. This is good mate. Huge amount of gain too. Thanks¤t=ada121ae.jpg&evt=user_media_share

    1. Excellent, thanks for the pic and for verifying.

  2. This is my first post here and I gotta say....where not worthy!!! This blog is awesome. I built a few of your veros with great success so thank you.
    My question is, would you know what sort of hfe am I aiming at with these trannies in this pedal? Thanks for your help mates.

    1. Hi Jeff!
      I believe most of the BMP-styled circuits work very well with ~600-700 hFE - and i do believe that's on par with most of the original units. But in my personal experience, some seem to sound very smooth and creamy with hFEs as low as 120. So i think it's much more a matter of opinion.

      You could try on different ones, but high measuring modersn 2N5088 is always a good and relatively cheap option. 2N5089, BC549C, BC550C and MPSA18 would be my next alternatives.

  3. Cheers mate, I'll have a mess arond with them then. I built the lunar module last week and its come out a treat. I settled on MPSA18 (hfe 680) for Q1 for a little extra pre-gain for my low output pickups, and BC549C's for Q2 & Q3 with a hfe around 580. Sound grand! Thanks for the reply and once again, ace blog