The Polivoks VCA has distinctive architecture – two differential opamp based VCAs in series each for LFO and ADSR control signal amplitude independently. Control voltage to attenuation behavior of this VCA is nonlinear and not logarithmic, it is kept authentic to the response of ПОЛИВОКС. As most Erica Synths DIY kits, Polivoks VCA kit as standard includes esoteric parts - it appeared that the world has run out of differential opamp ICs K118UD1A(B), but we developed an exact clone of that IC! All parts to make K118UD1 clone are included in the kit. Below find downloadable assemby manual!

We introduced plenty of improvements to achieve higher dynamic range, better reliability, lower noise, accept higher signal levels, keep consistent behavior, self-tuning of two internal offsets (that had to be manually tuned in ПОЛИВОКС), less susceptibility to radio interference and higher linearity, though the heart of it is kept the same. Nevertheless those, who like extreme experiences, can omit all added elements and use the same PCB (with few extra jumpers) to build 100% authentic Polivoks VCA.



  • PCB + IC clones and transistor = 27EUR
  • PCB + IC clones and transistor + panel = 44EUR
  • Full kit (PCB + IC clones + transistor + panel + all parts needed) = 85EUR
  • Assembeld module = 120EUR

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


Erica Synths Polivoks VCA on Modulargrid

See the build thread @ Muffwiggler!


Technical specifications:

2stage VCA


2 outputs (first stage+ sum)


Max GAIN (adjustable)


CV signal level

10V - +10V, depending on calibration

Power supply

eurorack standard +-12V

Power consumption

23mA (+12V), 17mA (-12V)

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!


Livefreela on Muffwigglers: "That said it makes a substantial contribution to the overall tonality of the system and shouldnt be overlooked even if its just used for color in tandem with a more conventional vca handling amplitude. great saturation in there that pairs wonderfully with the filter in bringing the harmonics out of the oscs. makes sense, because i seem to recall - and i may be totally fucking this up - that those russian op amps used in the polivoks vca were actually used in a few sparse (and now highly coveted) runs of old tube screamer pedals. or i could be totally off base... whatever the case may be, the vca sounds great!"