Eurorack Serge Variable Q (VCFQ) Full Kit

£129.87£149.52 (Excl. VAT)

Officially licensed Serge Filter in Eurorack! Full DIY Kit with Random Source?build documentation.

Due to these kits containing very hard to source THAT parts we do not anticipate another batch for at least another 12 months.

THAT 2180 Series - IC Chips × 3

Select which audio grade of THAT chip to include in the kit

Random Source recommend THAT 2180C for this project

Out of Stock



It contains all components required for a complete build, right down to rack screws and power cable. We selected and used the high quality parts as specced by Random*Source. Random Source have created a step by step build doc for this project

SERGE MODULAR FOR EURORACK – Under licence from Serge Tcherepnin

“Serge Modular” is an analogue modular synthesizer system developed by French composer and electronic designer Serge Tcherepnin in the 1970s at The California Institute of the Arts. Serge’s vision to create a “people’s synthesizers” led to a unique modular music system with an iconic design.

In collaboration with and under licence from Serge Tcherepnin, Random*Source offers a range of Serge modules, combining the original Serge circuits with the advantages of today’s technology. The modules on this page are in Eurorack (3U) format – modules in the classic Serge dimension (“4U” panel height) and the typical banana jacks can be found here.


The Serge Extended Variable Resonance filter (VCFQ) is probably the most famous filter of the Serge system and one of the essential Serge modules. It is an excellent, extremely versatile general-purpose VCF that provides simultaneous low-pass, high-pass, band-pass and notch (band-reject) outputs combined with unique flexibility. Its trigger in, LOW mode and self osciallation allow a variety of uses from Oscillator to VC processing.

Now – for the first time ever and licenced by Serge – the VCFQ is available as DIY kit for Euro.

Build documentation: Serge VCFQ BOM / Build doc

Thonk Kit Build Notes: Here

Some details of the Random*Source Serge VCFQ module kit:

  • Under licence from Serge Tcherepnin
  • Designed for High-end VCAs (THAT2180)
  • No matching of transistors required
  • No wiring needed
  • Eurorack format (3U), 14 hp
  • Power consumption: 52mA @ +12V, 52mA @ -12V
  • Module depth: < 40mm (1.5″)

The Random*Source Kit contains:

  • Color printed front panel, 2mm, cnc made in germany
  • 1 Serge VCFQ Euro pcb (through-hole, no components mounted)
  • 1 matching component pcb
  • ALL required parts right down to power cables and rack screws


Additional information

HP Size

THAT 2180 Series - IC Chips

Weight N/A
Audio Grade

2180C – High Grade, 2180B – Super High Grade, I will provide my own THAT 2180 IC's