Open-source version of the Roland TB-303.

We have two–count ‘em, two–analog electrical engineers with too much time on their hands working on this project. An original TB-303 was diassembled and reverse-engineered to verify the schematic. The original transistors were analysed using big expensive curve-tracers to determine their characteristics. We measured every waveform and counted every cycle to give you the best sound…its just like the original because it IS the original.

http://www.ladyada.net/make/x0xb0x/ via Rhizome