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.

Monday, November 14, 2016

Black Arts Toneworks Quantum Mystic

The Quantum Mystic is probably the most tricked out DOD250 around. It was developed with Mike Scheidt from the band Yob and based on his Grey Spec 250. It features an active 3-band EQ section and can create tones ranging from boost, to classic distortion, to modern doom metal tones.


  1. After building and playing with it for a while the only comment I have is that the gain knob isn't as responsive and doesn't have a lot of range as videos I've seen and heard of the original pedal. Is there any way to fix this? Thanks

    1. Try increasing the value of that pot

    2. Yeah, or B1M would probably work as well if you can't find a C1M.

    3. Thanks man. Will try it and post what happened

    4. Can you tell me about your pot markings because there is some confusion between continents as I have seen online. Maybe you could include this in your General layout notes.

      eg: a=log b=lin, c=rev log

    5. Yeah, what you posted is the convention I use. This effect is based off the DOD250 which used a C500k pot for the gain control, so I don't think there's a mistake with the schematic I based this off of. But sometimes things need tweaking, so experiment with B or C taper 1M pots.

    6. Alright thanks man keep up the good work