Excited that I am able to post this one today -
Erica Synths Legacy DIY stuff went Open Source!!!
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Wow! That’s awesome…
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That is really incredibly awesome. I was actually looking at the Polivoks modules earlier this morning. Now it’s just a matter of deciding what to get made. Perhaps all of it 
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I had my eye on that one as well.
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I’ve my eye on the vco and swamp. Sigh, added to the “when I can” list.
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Haraldswerk https://www.haraldswerk.de/
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Intech Studio > Otto’s DIY on GitHub:
Including Schematics, 3D printing files, and Gerbers.
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Not so much a repository about audio circuits, but a great accumulation of information about displays you might want to incorporate in one of your designs / circuits and how to do that: LCD-wiki.
There are some more displays described at: educ8s.tv
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Mostly pedals but also a lot of utility type designs.
Well worth a browse.
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Blog Casper Electronics (archived)
and video’s
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a lot of inspiration for me, how to forget it 
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http://www.synthpanel.com/ is currently saying “Account Suspended”. There still are these for CGS stuff:
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HAGIWO’s notes (in Japanese):
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Repository of the maker of the Theremidi:
More discussions about theremins here.
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Various modules from Electric Noodle Box:
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Hi! I’m working on a PCB of the “HAGIWO’s arduino module” for my CAD studies! Please give me feedback!
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This would be better posted, and replied to, in its own topic.
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www.ucapps.de Non-commercial DIY Projects for MIDI Hardware Geeks
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