10 HP
30 mm deep
Current Draw
15 mA +12V
15 mA -12V
0 mA 5V
$220 Price in €

This Module is currently available.

Specs are approved by the manufacturer

Voltage Controlled Oscillator

The System80 820 Eurorack Oscillator is a utility Voltage Controlled Oscillator (VCO) based on the saw integrator and waveshapers common to many vintage Roland designs from the late 1970s. It features a discrete temperature compensated saw (ramp) core coupled to waveshaping circuitry that produces a pulse wave with adjustable width, a triangle wave and a sine wave. The conversion of the saw wave to a triangle wave produces a distinctive reset glitch at each peak. The triangle wave is bent by a diode shaper to produce an approximate sine wave.


  • Discrete Voltage Controlled Oscillator with temperature compensated exponential converter
  • 1 V/octave tracking over 8 octaves
  • Sync input with weak and strong oscillator sync modes
  • 1 V/octave CV input + one attenuated exponential CV input for pitch/frequency modulation
  • Five position octave range switch
  • Waveform outputs: Pulse, Ramp, Triangle, and Sine
  • Pulse Width Modulation CV input

Open Source

820 is open source hardware. The design files are available on Github


Ø 5.00 (1 Votes) Average Rating
submitted Jun 20th 2019, 05:35 by minisystem | last Change Nov 20th 2019, 21:39 by minisystem

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