“Circuit Snippets” by T. Escobedo

If you have a little soldering experience–including building any of the electonics projects in Snip, Burn, Solder, Shred–then you’re ready for T. Escobedo’s “Circuit Snippets.” This document includes several dozen sound circuits (largely guitar effects, although they work with any sort of instrument you can plug into an amp), which range from the relatively common (e.g., distortion pedals, phasers, envelope followers, pre-amps, auto-wahs) to uncategorizable strangenesses. In terms of quality, many of these sound as good as mass-market stompboxes at one-tenth the price.
(The Synthstick entry has a bit more about Escobedo’s FolkUrban website, but the short story is that it was really cool, had lots of great designs for different instruments, and disappeared with GeoCities in October 2009. I saved PDFs of “Circuit Snippets” and the Synthstick, but many other Escobedo fans have done a much better job of archiving than I did, scooping up all of the audio samples, too. The “Circuit Snippets” mirror at Guitar HQ UK is one such faithful recreation of the old GeoCities page.)
“Circuit Snippets” by T. Escobedo