Erica Synths DIY Polivoks Voltage Controlled Oscillator uses the core of the original Polivoks VCO, but has plenty of modifications to adjust its performance to modular synth standards. Also DIYers can make their own modifications described in the Build manual. DIY kit, as all Erica Synths Polivoks modules, comes with a set of the original Russian ICs and transistors in three options: PCB (2 layers, 95x97mm) + rare parts (including copper sheet to make RFI/light shield for transistors :) ), PCB + rare parts + panel and full kit with all parts included to build this exciting module. Polivoks had two slightly different VCOs, therefore we made a PCB that is configurable to build both VCOs. WHEN ORDERING ONE VCO WITH A PANEL, AT THE CHECKOUT SPECIFY IN THE COMMENT, WHICH PANEL YOU ARE INTERESTED IN! VCO1 - with X-Mod option, VCO2 - with detune option.

Those, who have both VCOs and Erica Synths Polivoks Modulator, might be interested in DIY Mixer kit.

      Modifications, we did:

  1. changed CVs to eurorack standard 1V/Oct (original has inverted CVs)
  2. made all CV ins buffered in order to eliminate crosstalk and undesired detune (very few DIY kit producers buffer CV ins - mostly they are just summed on resistors). As result the VCO is surprisingly stable and tunes well.
  3. made optional adjustments to output signal amplitudes and offsets - you can have the original output signals (they are totally different waveform to waveform) or make them standard 10Vptp
  4. original Polivoks has interesting peak in the triangle waveform - we introduced optional filter to eliminate it or leave as it is
  5. we significantly updated pulse wave circuit and introduced PWM - it sounds insanely great!


      Prices (for one VCO kit):

  • PCB + set of ICs and transistors = 30EUR
  • PCB + set of ICs and transistors + panel = 51EUR
  • Full kit (PCB + set of transistors + panel + all parts needed) = 105EUR

+21% VAT for individual customers in EU without EU VAT registration number + shipping


Erica Synths Polivoks VCO1 on Modulargrid

Erica Synths Polivoks VCO2 on Modulargrid

See the build thread @ Muffwiggler!


Technical specifications:

Frequency range

from LFO to C8

Available output waveforms

triangle, saw, 4x pulse

Output signal level

10V ptp

Power supply

eurorack standard +-12V

Power consumption

30mA (+12V), 36mA (-12)

Module width


Module depth


PCB size



Disclaimer: please, if you have any questions on missing parts or similar issues, contact us within 1 months after receiving the kit!