I'm a huge fan of the work of Robert Moog (pronounced like "rogue"), who was one of the most important innovators in the field of electronic sound synthesis. Sadly he passed away in 2005. One of his most significant contributions was the synthesizer depicted below -- the "Minimoog Model D". This synthesizer defined the basic method that synthesists would use to create electronic music for the next 40 years. Using the original schematics, I'm learning electronics engineering one circuit at a time with the end goal being the creation of a working "Minimoog-like" synthesizer.
http://sites.google.com/site/minimoogwiki/HOME MADE LABOR (Blog)
WEBLOG : MUSIK MEDIEN KUNST
http://www.homemade-labor.ch/weblog/ "Ich verfüge über fast 20 Jahre Erfahrung in der Entwicklung von Schaltungen in Analog- wie auch Digitaltechnik. Diese Kenntnisse und mein Interesse an der “elektronischen” Musik und ihrer Instumente, war auch der Auslöser sich mit der Herstellung von hochwertigen Analog Synthesizern und anderen Geräten zu beschäftigen..."
http://www.musiksynthesizer.de/Do-It-Yourself Projects
DIY Music Projects // Vacuum Tube Modular Synthesizer etc...
http://www.electronicpeasant.com/projects/projects.html Synthesizer DIY Pages
by Rene Schmitz! - Online since 1996
http://www.uni-bonn.de/~uzs159/ modular synthesizer
It is a collection of notes, circuit diagrams and stories about the creation of modular synthesizer
http://www.cgs.synth.net/ DER SIMPLESIZER
ein einfacher analoger synthesizer zum selbstbau
http://www.sequencer.de/forumsynth/simplesizer.html DIY electronic music instruments
This site by Marc BAREILLE contain technical informations on DIY electronic music instruments >> DIY Synthesizers + MIDI-Projects
http://m.bareille.free.fr/index.htm MSC175 Projektseite
Synthesizer Technik
http://www.msc175.de/ A simple EPROM Sampler
A simple design to bring 8s of 8bit sound to a speaker.
http://llg.cubic.org/es/ A Moog Filter (VCF)
For the Formant I have made a Moog ladder filter. This circuit is based on the MiniMoog/Prodigy VCF.
http://dropmix.xs4all.nl/rick/Emusic/Moog/ ASM-1
The ASM-1 Analog Synthesizer Module by Gene Stopp and additional text by Magnus Danielson
http://home.swipnet.se/cfmd/synths/friends/stopp/ microLARGE
TR-808 CLONE, PCB's, [Sound Tech by Hallucinogen]
http://xlargex.xl.funpic.de/ Minty MP3
The Minty MP3 player
http://web.media.mit.edu/~ladyada/make/minty/index.html Mystery Circuits - Sound Gizmos!
This page contains a compilation of sound gizmos built or modified by Mike Walters.
http://mysterycircuits.com/projects.html 
