While browsing around the DIYguitarist forums looking for more info on a particular PT2399 Delay IC, I came across this link to a HUGE DIY Stompboxes gallery with schematics and build pictures. One can spend days leaching all the good distortion and classic effect schematics from this place. Make sure to save your favorites locally cause its not uncommon for this info to disappear after a while. Huge thanks to Aron Nelson for hosting this gallery. Enjoy.