Monogon VCO


An additive workhorse...

The Monogon is a eurorack voltage controlled oscillator capable of producing remarkablely pure and highly stable triangle and sine waves. At its core the Monogon is based around an astable schmitt trigger and op amp integrator that are fed by an exponential voltage converter tuned to the traditional 1 volt per octave standard. Along with triangle and sine waves, the VCO also features a square wave output with variable pulse width. While the Monogon is certainly well suited for subtractive synthesis, its purity, range, and stability allow it to truly excel in an additive modular system.

Features and Specifications:

  • 1Volt/octave input, 3U eurorack compatible
  • 100% analog circuitry
  • Coarse, fine tuning control
  • Exponential, linear modulation CV inputs with attenuators
  • Pulse width modulation CV input with attenuator
  • Triangle, sine, square wave outputs
  • Frequency range: 10Hz - 20kHz+
  • Output Voltage: 7-10Vpp
  • Front panel: 3mm thick, laser cut clear acrylic
  • Width: 14 HP (approx. 70.80 mm)
  • Module depth:
  • Power: +/- 12 Volts DC at 40-60 mA (shrouded 16 pin header)

Sound samples and compositions:

This demo features the Monogon voltage controlled oscillator's raw wave output. The Monogon is receiving pitch cv from an Arturia Beatstep sequencer, and the pulse width and frequency modulation is being performed by a second Monogon. A Tetragon VCA is being used for final ouput and mixing of wave signals. This demo is intended to represent the pure and unadulterated audio produced by the Monogon, and no additional signal processing has occured other than what has been mention above.

  • 0:00 - 0:32 Triangle wave output
  • 0:33 - 0:50 Sine wave output
  • 0:52 - 1:18 Square wave output
  • 1:19 - 1:48 Square wave with pulse width modulation
  • 1:50 - 3:20 Sine wave with varying exp. frequency modulation
  • 3:21 - 4:14 Square wave with varying exp. frequency modulation