A triangle core analogue eurorack VCO.

The omsonic Triangulum is an extremely solid triangle core analogue eurorack VCO with excellent temperature stability, tracking over 7+ octaves and lots of nice features in a small 11HP footprint.

What’s special about it ?

The Square wave
Unlike most other eurorack VCOs the square wave pulse width is calibrated to exactly 50% meaning it sounds similar to a lot of classic synths that used this technique such as the Roland System 100m for example.

The Saw wave
The saw wave has a switch associated with it that lets you select between a regular saw or a saw that is an octave above the other waves.

The tuning system
Below the octave switch is a “freq” knob that can be used to tune the VCO over 2 octaves. The freq knob is connected to 3 indicator lights “5th, +1, +2” these aid in quick tuning by lighting up when the VCO is at +7 semitones (a 5th), + 1 octave and + 2 octaves.

Voltage regulation
The triangulum makes use of onboard voltage regulators meaning the VCO will have the same calibration characteristics in every system it is used in, this also helps with stability.

- 6 way octave switch
- Calibrated PWM with a control for pulse width and PWM amount
- 2 Octave frequency control knob with tuning indication feature
- Linear and exponential FM selectable via a switch
- FM Depth knob
- SUB octave square wave output
- Triangle wave output
- Very clean sine wave output
- Square wave output
- Saw wave output with +1 octave saw wave selectable via a switch
- Only 11 HP
- Built in the UK with quality parts


  • 64 mA +12V
  • 64 mA -12V
  • 0 mA 5V
  • 33 mm deep

This Module is currently available.

$250 Price in €
11 HP Oscillator
submitted Jun 2nd 2018, 17:14 by omsonic | last Change Dec 4th 2019, 19:53 by omsonic
Specs are approved by the manufacturer

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