This pedal is a clone of one on my favorite effects pedals from the 80's... ProCo's RAT Distortion. It's a basic OpAmp distortion pedal using the classic LM308N IC chip that is a fairly simple build for those handy with a soldering gun, have a free weekend, and love rock-n-roll.
The layout we are using was designed by Francisco Pena who has done an excellent job with this and other pedal designs on Tonepad.com. (please refrain from editing the circuit board artwork unless you have permission from the author. (sorry Francisco!!))
The schematic and PCB are available in PDF form at TonePad.com following this link , which also has a great library of other effects pedal and guitar related projects to build from beginner to advanced. You will also need the PDF for Off-Board Wiring for wiring the input/output jacks and power for the pedal.
TonePad.com also carries ready-made Printed Circuit Boards to purchase if you don't have the time or effort to make your own. The PCBs on tonepad.com come with a screen printed component side, tinned solder pads and also a solder mask - all for a pretty decent price considering the cost of supplies you have to buy to make your own! I recommend going this direction if you want as close to error free build as possible.
You can buy the majority( if not all) of the parts from Small Bear Electronics which offers pretty reasonable prices and are supporters of TonePad and several other DIY music project sites. (Also recommended!)
I created the graphics in Adobe Illustrator and have made it available below to all that wish to use it. It is a PDF file saved out of Illustrator so it is easily edited with any vector graphic software that can open pdf's..... have fun with it and go wild.
(I'll post some sound clips and maybe some video soon to give you an idea what it can do.)
Now lets get ready to Rat-n-Roll.....