Available as an assembled Module and as a DIY project.
This Module is currently available.
Tri-Square Wave Oscillator Drone
The 4093 NAND Synth is a super-modifiable noise generator that will knock your socks off with its sheer amount of sonic potential! NOW with Vactrols and CV Input. Low pulsing drones, random robotic chaos, high-pitched laser sounds – it’s all here in a 8 Hole-Point wide layout. A great project to begin your explorations into the world of DIY sound synthesis, the PCB was designed with the beginner in mind. Board-mountable switches, socketed IC, hands-on knobs and switches for tone control, and a detailed silkscreen PCB to help you solder components right the first time. The Eurorack 4093 NAND Synth Kit includes all the components that you’ll need to build your own. Our Eurorack NAND Synth Kit comes with:
Provide power via a 10-Pin unshrouded 12V Eurorack header
3 CV-Inputs, each vactrol/optocoupler controlled and each with their own trip-pot for personal adjustments
8 HP
1.036" Deep
Comes with power cable and 2.5mm screws
http://www.synthrotek.com/store/eurorack-4093-nand-synth-p-221.html
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These merchants probably sell this module. Huh?