ILSE - DIY kit
ILSE - DIY kit - side
ILSE - DIY kit - front
ILSE - DIY kit
ILSE - DIY kit - side
ILSE - DIY kit - front

ILSE - DIY kit

»Ilse« is an elegantly minimal, but fully functional synthesizer voice in a 10 HP Eurorack module. The only thing you need to let it meow is a MIDI to CV converter (or another CV source of your choice) to trigger its 1V/Oct frequency input. Because it has such a low part count (only 2 opamps and 7 transistors) it is ideal for Eurorack beginners or entry-level DIY projects.

Ilse is designed as a low cost, easy to build, but still flexible and feature rich synthesizer. It works as a Eurorack module. Alternatively it can also be driven standalone with two 9V batteries (not included).

Ilse is open source and inspired by Syntherjack’s single-chip synthesizer Totoro




  • Two saw tooth oscillators
  • Bridged-T low pass filter with resonance control
  • Triangle LFO with speed control, and routing to filter and/or oscillators
  • Simple mixer and detune for oscillators


  • LFO Speed, Filter Modulation, Osc Modulation
  • Filter Cutoff, Filter Resonance
  • Tuning, Osc2 Detune
  • Osc1/Osc2 (Filter in)
  • Output volume


  • 1V/Oct CV for oscillators (0-5V)
  • Gate (0-5V)
  • Filter cutoff (0-5V)
  • External filter input
  • Volume controlled output
  • LFO Speed (linear, via solder pad on back, 0-8V)
  • Oscillator 2 detune (linear, via via solder pad on back, 0-8V)

Current draw
+12V: 22mA, -12V: 18mA
Size | HP
DIY Level
Chair Audio

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