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The ES20 starts with a classic sawtooth oscillator core and adds a voltage controlled wave shaper to the output.


Unlike most conventional VCOs' the ES20 does not have a 1V/Octave input. However the scalable input [CV A] of the ES20 can be used in conjunction with the [FREQUENCY] control to provide tonal tracking.


The [CV B] knob can be used as a FINE TUNE control for the oscillator.

The wave shaper allows the [SHAPED] output to swing from a sine wave to a modified sawtooth output and can be both manually and voltage controlled.

See the Patch Of The Week below from Doug for a comparison with the original Serge 1973 VCO.



This Module is available to buy as - 


  • A fully assembled module with 3.5mm sockets. (Eurorack 1/8" Standard)
  • A fully assembled module with 4mm sockets. (Banana Jack)
  • A full DIY kit, all parts and components to build your own 3.5mm sockets.
  • A full DIY kit, all parts and components to build your own 4mm sockets




Width: 12hp

Depth: 60mm

Contents: Panel, PCB/s, Components, Ribbon Cable, Screws

Build and Technical Information: Click Here

Elby Designs Serge ES20 1973 VCO Oscillator DIY KIT Eurorack Synthesizer

3.5mm or 4mm Jack
  • Shipping Transit.

    With Tracking 7-14 Business Days (Estimated)

  • Sales & Taxes.

    The sale price listed is AUD (Australian Dollar), and is the final price to pay.

  • Payment.

    Credit Card (Visa, Mastercard, Amex), PayPal.

  • Warranty/Returns.

    1-Year warranty against defects, and manufacturing faults. (Click for more)

  • Additional Notes.

    This module is available to buy with 3.5mm (1/8" Jack) sockets or 4mm (Banana Jack) sockets.