Schematic Heaven. A fine schematics collection.
Schematics of amp and speaker simulators
Lots of schematics
General Guitar Gadgets
Guitar Tube Amp Schematics
Erik's DIY Effects and Mods
Stellan Lehrberg's schematics Lots of interesting schematics
Kenneth Johansson Svensk sida om elektronik
Justin Philpott's schematics Frequently updated!
Links to almost every manufacturer of semiconductors and their data sheets! Greate page, I think!
Earnie - The modular synthesizer
Analog synth project (by Mikko Helin)
Synth Fool! Analog synthesizers
Guitar-related Circuits Many schematics but never updated.
DMZ Schematics. Sometimes updated.
GEO - The Guitar Effects Oriented Web Page. Guitar effects FAQ and schemes. Sometimes updated.
Bob's Music/Vacuum Tube Audio / Electronics page Tube amps, schematics. Sometimes updated.
Classic and Vintage Audio Circuits Page by Bob Rowlette. Sometimes updated.
AEK Schematics
Shortcuts to several schematics on the net!
Music instruments schematics
Ampeg schematics PIC LINKS!
PIC in MIDI applications.
Dontronics. Free programming software.
David Tait. Free programming hardware.
Microchip (the manufacturer of the PIC). Here you can download the complete data sheet and programming manual!
Good PIC link.
MIDI foot pedal build around a PIC.