Open source electronic musical instruments designed in London.
DIY Eurorack Module

Supply: 0mA
Size: 4 HP
Depth: 25mm

Modular Grid
License: CC-BY-SA
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Full kits from Thonk

8 things to know about the Volts Expander

  1. Tweak five potentiometers to set up another voltage output from the Turing Machine. This can be a different melodic sequence, related to but different from the main output.

  2. This is a simple, low-parts count, low-current expander for the Turing Machine Random Sequencer in 4HP. It connects around the back with a 16-way ribbon cable and works with any Turing Machine (Mk2, or Mk1 with the backpack).
  3. It acts like a variable 5-bit digital-to-analog converter, taking 5 bits from the Turing Machine GATES expansion port, running them through five potentiometers and giving one summed voltage output.
  4. Multiple Volts expanders can be daisychained from one Turing sequencer to give melodically different outputs that are all related to (and change with) the main Turing sequence.
  5. This 27 minute video from DivKid explains everything you need to know about the Turing Machine and expanders:
  6. You can try out a fully operational Turing Machine + Pulses + Volts in the free VCV Rack software.
  7. Volts is a shrunken version of the original Voltages expander, and was designed in one day while on holiday in Cornwall.
  8. Volts is a very straightforward through-hole DIY build, that would be a good first DIY project. If you get stuck, the Volts Github Issue List or the main Turing Machine issue list are probably the best places to start, although very few people have ever had difficulty with this module.