Eurorack Serge Stereo Mixer Full DIY Kit

£225.00 (Excl. VAT)

Limited Edition audiophile edition of the Serge Stereo Mixer for Eurorack – using 4 NJR Muses chips and lots of Burr-Brown op-amps for superior audio performance.

THAT 2180 Series - IC Chips × 4

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

Random Source recommend THAT 2180B for this project

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

Many of the components are already soldered – all SMD parts have already been professionally reflow soldered in. This is therefore a very quick build that mainly requires soldering of pots, jacks, caps and headers.

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.


Combine the sound of classic Serge amplifier designs with audiophile NJR Muses OP amps plus THAT2180 VCA chips and you get The Equal Power Stereo Mixer. This module has 2 independent input channels (with attenuators) that can be Stereo panned between the 2 outputs. Each channel’s gain is controlled by a gain knob and a Gain CV input (with attenuator) which allows signals to go into massive overdrive with a very organic sound. There are also two AUX inputs that allow signals to be routed in at unity gain. Both panning and Gain CV inputs have been designed to handle audio rates, making the Stereo Mixer a very powerful waveshaping and droning tool.

Beware that the module is able to deliver massive gain, resulting in output levels of up to approx. +/-11V when overdriven, so make sure your other equipment (AD converters, mixers) can handle this.

Stereo Mixer Build Document –


The “Donks” demo uses the Stereo-Mixer (4U version), mostly as a waveshaping tool):

Some details of the Random*Source Stereo Mixer Euro kit:

  • Under licence from and in cooperation with Serge Tcherepnin
  • Balanced Outputs
  • NJR Muses op-amps in the audio path.
  • CV inputs capable of audio rates
  • No wiring needed
  • Eurorack format (3U), 18 hp
  • Power consumption: 100 mA at +12 V, 100 mA at -12 V
  • Module depth: 40mm

Additional information

HP Size

THAT 2180 Series - IC Chips

Audio Grade

2180C – High Grade, 2180B – Super High Grade, 2180A – Pointlessly Audiophile Grade

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