Here is a great step-by-step tutorial by instructables user jonboytang, on how to make tonepad.com’s Tube Screamer Clone stomp pedal. The tutorial is done up very well with a ton of pictures to accompany it. Check it out here.
diyguitarist.com is yet another great place for the DIY musician. They have a plethora of effects and projects not to mention their huge list of links to other sites of its likes. Odds are, if you want to get started making your own effects, then I would have to say…. Start Here
Muzique.com has a great list of DIY guitar effects projects which include schematics, PCB layouts and even some tutorials for the DIY musician. Many distortions, mixers, and boosts just to name a few
Link to FX projects……
Latest Instructables