Since most of you have some free time this summer I put together a small list of interesting pedal/electronics books to read. There are tons of great tips and schematics in these books to build/mod your own cables, di-boxes, in-guitar-boosters, fuzzes, heaphone amps and much much more. You’ll find out how to create sound enhancements that are not commercially available!
Electronic Projects for Musicians by Craig Anderton. This is a good introduction to DIY world. The book is old but timeless (all the parts are available today) and explains everything in an understandable way. There are plenty of good projects to build in this one, for example: guitar preamp, metronome, headphone amp, fuzzes (for bass also), compressor, talkbox, etc.
DIY Projects for Guitarists by Craig Anderton. Another classic by Craig Anderton, this time more guitar-oriented and includes projects like: de-hisser, tube preamp, cord tester and audio adapters for studio use.
Guitar Effects Pedals: The Practical Handbook by Dave Hunter. Experienced player Dave Hunter offers insight from the top builders and tips on how to get the most from each pedal. The author also dissects chains used by top guitarists in creating memorable recordings. Entertaining to read and contains good info on how pedals work and tips how you can build your pedalboard. The accompanying CD has sound samples of popular and not so popular pedals!