System80 810 Eurorack Synth Voice Module

System80 810 Eurorack Synth Voice Module

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Eurorack Voice Module

The System80 810 is a 30 HP Eurorack module consisting of a standard subtractive analog synthesizer voice: Voltage Controlled Oscillator (VCO), Voltage Controlled Filter (VCF), and Voltage Controlled Amplifier (VCA). While not strictly a clone, the design of each sub-module is inspired by the golden age of Japanese analog, featuring elements of the System 700, System 100m, and the Jupiter-8. Add some modulation and an envelope generator to create a complete patchable analog voice with a distinctively vintage character.

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 + two attenuated exponential CV inputs for pitch/frequency modulation
Five position octave range switch
Selectable waveform output: Pulse, Ramp, Triangle, or Sine
Pulse Width Modulation CV input

Cascaded OTA design inspired by classic Roland topologies with selectable 12 or 24 dB response
self-oscillating with 1 V/octave tracking (3-4 octaves, normalized to VCO KYBD CV input)
VCO output and sub-oscillator normalized to two log attenuated inputs
Two frequency CV inputs, one unipolar and one bipolar
Voltage controlled resonance

Traditional single OTA design
Three log attenuated audio inputs with IN 1 normalized to VCF output
Two CV inputs with selectable exponential or linear response

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