This is a library of perfboard and single-sided PCB effect layouts for guitar and bass. I'm not an electrical engineer by any stretch of the imagination, just a DIY'er who likes drawing layouts. It is meant for the hobbyist (so commercial use of any of these layout is not allowed without permission) and as a way to give back to the online DIY community.

Friday, March 24, 2017

Way Huge Swollen Pickle Mk 2

For Fuzz Friday here's the newer and highly tweak-able Swollen Pickle from Way Huge. Like the Mk 1, originals use a MPQ3904 transistor array instead of individual transistors. Couldn't make that work this time around, so just stick with individual 2N3904s. Originals also have 2 of the controls internally, but what's the fun in that? All 7 pots are for external mounting and the whole thing will fit in a 1590BB with top mounted jacks fairly easily. Here's the schematic for reference. You'll notice a few values are a 10th of typical values found in a Big Muff (indicated by an * in the layout below). Not sure if it's a typo on the schematic or just the way Way Huge did it this time around. YMMV


  1. I tried building one using that schematic a year back and noticed some odd values that didn't even match the mk1 pickle. This is basically an mk1 with extra clipping and eq, among other tiny changes.

    I ended up buying a board from Fuzz Dog (they're great!) and sure enough, they are 10x the size of the ones on that schematic. Go for the 470k and 100k's first, is my advice.

    Nice looking layout! Thanks for all your great work.

  2. What a coincidence! Here I am, began making the Mk-1 pickle, parts on the board, not soldered yet and you post Mk-2 with 7 pots. I'll just ditch it now and move on to this. :) Thank you as always.

    1. Tag it verified man! This is absolutely the best muff, for bass at least. I was using Musket with blend but the Pickle Mk2 allows so much bass to pass and even boost on top, you can do without a clean blend for sure. From Blueberry like tubey overdrive to ultimate doom bass, this is it! Thank you so much!
      Some notes:
      1- You and AlexS were right. Indicated values are really x10.
      2- I made the crunch pot a 470k audio taper(-ish) as in the schematic from a 1M pot by adding 2.7M(legs 1&2) and 56k(legs 2&3) resistors.
      3- I think filter pot also requires some taper. Will experiment.
      4- Very silent muff! Even without the noise-cancelling features of a guitar amp, you hear no hiss or radio mixing in ever connected via an interface to PC.
      5- Try to match transistors to get close to the original array. Closest trannies I had was 3 325hfe and a 327.

    2. Thanks for verifying and for the great build report!

    3. One thing I'd like to mention is that this isn't a straight forward muff to setup correctly. It offers the widest range of sounds of any muff I've tried but every knob affects all the others and can be very annoying to tune; kind of like a Floyd-Rose bridge. Ha! But once it's set right, it's awesome. You might want to write down knob positions of your fav sounds before going live with it. Just don't get disappointed right away and keep tweaking.

  3. Is posible, death by audio Apocalypse??