PS110 Voltage Controlled Oscillator

by Antti Pussinen and Wolfgang Spahn

In this paper synthesizer workshop,we look into, and build a saw wave core for a one volt per octave oscillator.

A Voltage Controlled Oscilator, or vco, is the heart of any musical synthesizer. It usually forms the starting material for subtractive audio synthesis. An analog VCO of this kind creates an audible waveform by charging and discharging a capasitor. Voltage control enables one to control the frequency of the produced waveform in selected musical scale and play notes or a melody.

In a following workshop we build a wave shaper board to the VCO, adding the rest of the waveforms and a linear frequency modulation input.


  • compatible with euro rack format
  • built in power supply for stable voltage response and possibility to power over usb cable
  • 1V/octave response(configurable to 1v/hz)
  • exponential frequency modulation with attenuation potentiometer
  • sync input with sync level adjustment
  • saw wave 10vpp output

Additional features with wave shaper board:

  • sine, square, pulse width modulation and triangle outputs 10vpp
  • pwm modulation cv input
  • Linear frequency modulation with attenuatio potentiometer

PS110 clean test:

PS110 exp fm test:

PS110 sync test:

All the tools and materials will be provided.
The faceplate is not included!
The workshop will be held in German and English.

Februar 28 2015, 11am - 5pm

Werkstatt Berlin
Mülhauserstr. 6. Hofgebäude 1. OG, 10405 Berlin

Costs: 30,00€ plus 20,00€ for the materials.
Registration: post<at>