This pcb can be used to build one of 4 well-known distortion and overdrive effects.
The pcb dimensions: 55x31mm. It is professionally made, all holes drilled including silk screen.
Here the Plus docs: Das Plus docs
Here the 250 docs: Der 250 docs
Here the 250G docs: Der250G docs
Here the 308 docs: Der 308 docs
Of course these projects are also available as complete kits!