Erica Synths Polivoks VCO PCBs, Panel and KR198NT1A IC
Erica Synths Polivoks VCO PCBs, Panel and KR198NT1A IC

Erica Synths Polivoks VCO PCBs, Panel and KR198NT1A IC

Your Price:$34.99
In Stock
Part Number:ES-VCO-PCB
Please note: this includes the PCBs, Panel and the KR198NT1A IC only. No ICs or other parts are included. Please see the bill of materials link below to source the rest of the parts needed.

The core of the VCO is borrowed from the famous Russian synth Polivoks VCO and in exponential converter we use the original matched transistor IC that was used in Polivoks.



  • Triangle, saw and pulse wave outputs
  • Manually adjustable and CV controlled pulse width
  • Great tracking across 8 octaves
  • Exponential FM input with attenuator
  • Synchronization input
  • Octave switch – 5 octaves
  • Skiff-friendly design


We have significantly updated schematics:

  1. Introduced +-10V regulators for greater stability of operation,
  2. Adjusted signal amplitudes to match requirements of contemporary modular synths and made all output signals available simultaneously,
  3. Redesigned CV inputs to accept positive CV signals,
  4. Introduced PWM circuit with manual and  voltage controlled pulse width,
  5. Introduced synchronization input, so you can sync the VCO to other VCOs.


This is a comparably complex DIY project for experienced builders. We do not recommend this for beginners and ones without proper soldering and testing equipment. 

Technical specifications:

Audio output amplitude10Vptp
Octave rangeC0 – C8
Panel width  12HP
Module depth35mm
Power consumption[email protected]+12V, [email protected]

See the assembly guide/BOM for a complete list of the parts needed. Please note that we have made some slight changes from the original Erica Synths Github BOM for various reasons.

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