Here you can find links that were thought to be useful to people visiting this site. It is arranged by category.
Note : This list is old. Needless to say many links are dead, I have left them so you can try that link in Archive.org. In some cases I have already provided an Archive.org link . If you have an updated link for something on here please contact me.
Anders Sponton's Cloned Analog Gear
http://www.till.com/arptech/index.html ARP Technology - Some ARP schematics
The Bergfotron - Highly custom modular by Jorgen Bergfors (updated 9-9-02)
Spider RooM Labs - Bojan Burkeljc's PIC Projects
Carlos Vila Deutschbein's Site - Polyfusion VCA and more
Cayocosta DIY Pro Audio Recording Gear
Chris MacDonald's DIY page - VCO boards available.
Classic and Vintage Audio Circuits - Neve and LA2A schematics
Dave Krooshof's Site - Check out the unique instruments!
Dave Magnuson's DIY Page - Old Datasheets
amzfx formerly Digital Music Zone - Schematics for effects units.
Electronic Peasant - DIY projects on the cheap!
Godric's Home Page - Schematic for home built sequencer ( link to Internet Archive )
Henry's Exciting Electronics - Lots of analogue goodness
Hoshuyama's Synth Circuits - Unique Japanese circuits
Introspectiv - Trevor Page's website
Jesp's TB-303 and drum clones - In spanish.
Jim Patchell's Synthesizer DIY Page
The Leper's Abode –More effects circuits.
Marc Bareille's Site - Excellent ASM-1 build!
Marc Heijligers's DIY DAC project
Music Machines DIY page - Great archive of circuits!
Music Synthesizer - Grant Richter's DIY Site
Oakley Sound Systems - Tony Allgood's web page
Purple Audio's Resource Page - Some vintage manuals
Rick Jansen's Electronic Music Projects - Also check out the DIY mailing list!
Rob William's Odyssey Home Page - Great Odyssey resource!
Roman Sowa's Homade Modular - With schematics!
Sean Costello's Schematics - Another Internet Archive link
Scott Bernardi's synth OGEE - With schematics
SDIY.org - Free webspace for SynthDIY pages. Many excellent resources here.
Synth DIY Beginners Page - Excellent resources for beginners! ( Another Internet Archive link )
Synthfool!- Kevin Lightner
Tom Gamble's Electronics For Music
Tomi Engdahl's Audio Circuits Links Page
Oberheim Heaven - Documentation/patches
Blacet Research Music Products
EIO's Artistic Application Using Electronic Components - Site is up and lists link, but link is dead. Need to follow up.
Electronotes - Considered to be the Bible of Synth DIY
PAiA Electronics, Inc. - A company that sells DIY kits.
Synthesizers.com - Makes Moog format-sized modulars for cheap!
Synthesis Technology - Home of MOTM and site for CEM information
Synthi Group Netherlands - manuals for sale in the Netherlands
http://www.technick.net Technick.net - Miscellaneous circuits and software programs
Tom Scarff's MIDI Hardware Kits
Trimlog Technologes - Sweden distributor for PAiA and components
North Coast Music - Vox Schematics
Roy J. Tellason's Parts Pages - Huge collection of datasheets and parts information.
ECE480 Electronic Guides - Great resource for beginners
Synth Services - Tom Moravansky & Co.
Synth Service UK - No relation to above
Alberta Printed Circuits - Canadian – next day processing
World Wide Circuit Design Network
OlimexFast PCB Prototypes - Located in Bulgaria!
EP Circuits - Canadian 1-week turnaround
PCB Milling - Prototype Milled PCBs!
PCBFabExpress - Another PCB fab shop.
https://www.modularsynth.co/sdiy-tag From site : Best of modular, modular synth, eurorack, SDIY, modular builds, news and more
Creative Synth - Great quirky site devoted to synths and programming
Dan Slater's Music Page - Using Analog Computers! ( link goes to Internet Archive )
The RCA Synthesizer - Information on the infamous machine! ( note: new link, may not have the same information at the previously listed but missing site )
Tomi Engdahl's Music Electronics Page - links ( now a link to his main page )
Tangible Technology - Interesting audio information
USSR Synthesizers - Hard to find information! ( link to Internet Archive )
Vemia - Online vintage music al instrument auctions