omsonic – Triangulum


An extremely solid triangle core analogue eurorack VCO with excellent temperature stability, tracking over 7+ octaves and lots of nice features in a small 10HP footprint.

Out of stock


The omsonic Triangulum is an extremely solid triangle core analogue eurorack VCO with excellent temperature stability, tracking over 6+ 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’s
The Triangulum has 2 separate saw wave outputs crammed into, it has one normal saw wave output and a second saw wave output exactly one octave above all the other waves. Due to the small size of the VCO the second “SAW +1” out is selected using a switch that selects between triangle out and SAW +1. 

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
  • Superb tracking over a minimum of 6 octaves
  • Calibrated PWM (50% is EXACTLY 50%) 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 can also be changed to a saw wave exactly one octave above the pitch of all the the other waveform’s using a switch. 
  • Very clean sine wave output
  • Square wave output
  • Only 11 HP
  • Built in the UK with quality parts

Physical info
60 mA +12V
40 mA -12V
0 mA 5V
33 mm Depth
11 HP

Please note unlike my other modules this one has a matte black panel !

The tuning arrangement

The omsonic Triangulum on Modular Grid ! 

Any questions please send me an Email !

omsonic triangulum eurorack VCO

Additional information

Weight200 g