VERO
Quad op amp version per as the original. ...and a 2x dual op amp version. For some reason it has some minor noise issues with the Mid a...
dirtboxlayouts.blogspot.com
Collection of vero (stripboard) & tagboard layouts for 100s of popular guitar effects, with over 1000 verified designs. DIY your own boutique effects!
tagboardeffects.blogspot.com
PERF
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 Gre...
effectslayouts.blogspot.com
DIY MISHMASH
The Quantum Mystic is essentially a Dist+/250 with an op-amp based TMB tone-stack after it.
So you could roll your own with one of these:
Compare to MXR Distortion+ / DOD Overdrive 250 Preamp
www.pedalpcb.com
followed by
Box and All EQ
Compare to EQD Tone Job
www.pedalpcb.com
or
Cold Turkey EQ
https://www.pedalpcb.com/product/coldturkey/
Just about every PCB supplier has boards for the Dist+/250 and a simple EQ, for instance:
GPCB's EMEXAR & TwEQ;
ELS's Drivestortion and Undercut;
etc.
You'll just need to adjust values by comparing the schematics above with the original QM, subbing in the QM's values.
Not an exact clone in the end but something so very close if you plug in those QM values.
FLAMING LIPS
Deadend FX's Wurmloch, PCB sold via Pusherman. (Can't get any Pusherman link to work).