Available as an assembled Module and as a DIY project.
No info about availability.
The heart of a TB303 synth recreated in modular format x0x xOx
From Open Music Labs, the x0x Heart PCB by itself is the heart of the infamous TB-303, surgically extracted to be transplanted into your designs. The x0x Heart is the analog section of the TB-303, replicated with SMT components, and made small enough to fit behind a Eurorack front panel.
The Eurorack module pins out all of the knobs of the x0x Heart, and allows for CV control of frequency, gate, accent, slide, env-mod, decay, and cut-off. There are also switches for waveform select, external audio input, and outputs for both the VCA and VCF.
Assembled units can be preordered via the crowdfunding campaign on Crowd Supply, ending June 27, 2016:
Alternate spelling: xOx heart
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These merchants probably sell this module. Huh?