Eurorack Serge Wave Multipliers Full DIY Kit


Officially licensed SERGE Wave Multipliers (VCM) in Eurorack!

Full DIY Kit with build documentation.

EU Price  does not include EU VAT.

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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 full step by step build doc for this project.

Most of the components are already soldered! The back board is already fully populated and soldered with SMD components, this is therefore a very quick build that mainly requires soldering of pots, jacks, trimmers, LEDs 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 – modules in the classic Serge dimension (“4U” panel height) and the typical banana jacks can be found here.


The legendary Serge Wave Multipliers (VCM) are designed to dynamically add new harmonically-related overtones to an input waveform. Accroding to the 1982 catalogue, they “alter the timbre in exciting new ways, producing interesting alternative forms of signal processing which are unique in the Serge Modular Music System. Since there are three entirely separate and different types of Wave Multipliers in this module, an enormously varied palette of new effects can be synthesized.”

The top section offers two different modes, selected by a switch. In the “HI” position, the module functions to “square-up” an incoming signal, with a rounded flattening of the signal peaks, somewhat similar to overdriving a tube amplifier (with voltage control!). In “LO” mode, the module is a linear gain controlled VCA. This is useful for various functions such as amplitude modulation and for gating signals into the other sections.

The middle section generates a sweep of the odd harmonics (1, 3, 5, 7, 9, 11 and 13th) when a sine wave is applied to its input and the FOLD knob is turned up or a control voltage is swept from low to high. This effect is similar to overblowing a wind pipe closed at one end. A second input is included to allow two signals to be mixed before processing. This module can be used to explore timbral areas beyond the range of ring modulation.

The bottom Wave Multiplier performs non-linear wavehaping known as full-wave rectification, but with sophisticated level-compensating conditioning as well. The circuit uses three full-wave rectifier sections linked in a very refined controllable format. Sweeping the VC input over its range will produce a smooth timbral transition using the even harmonics (second, fourth, and eighth). Many other partials are present in this basic sound, however, and the sonorities are very rich and varied. The white output is a “squared up” version of the black one, resembling an harmonically enhanced pulse width modulation.

The Random*Source version of the Serge Wave Mulitpliers for Euro is a licensed and authorized adaption of the original Serge design, using best parts available today (e.g. Burr-Brown op-amps, C0G capacitors up to 220N) for optimum audio performance.

Now – for the first time ever and licenced by Serge – the Wave Multipliers are available as DIY (SMT) kit for Euro.

Some details of the Random*Source Serge VCM module:

  • Under licence from Serge Tcherepnin
  • Main pcb in SMT, containing almost all components (reflow soldered in)
  • Premium parts used (4 Burr-Brown op-amps, C0G capacitors up tp 220N, Wima 1uF …)
  • No obsolete parts needed
  • No wiring needed
  • Eurorack format (3U), 18 hp
  • Power consumption: 45mA @ +12V, 40mA @ -12V
  • Module depth: < 35mm (1.5″)

Build documentation –

Additional information

Weight 0.22535 kg