Serge Modular for Eurorack

"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.

Serge NTO for Eurorack
Serge NTO for Euro

Serge New Timbral Oscillator (NTO)

The NTO is Serge's legendary and most ambitious oscillator. It combines raw vintage sound with astonishing precison.

The new NTO by Random*Source has been developed in close cooperation with Serge. It took about 2 years to replace obsolete parts and bring the NTO to SMT with some optimizations (precision references and parts) for stability. It also features a new Pulse Out (square wave) in addition to the classic outputs.

Some details of the Random*Source NTO module:

  • Now with PULSE OUT
  • Variable oven temperature
  • NTO on multilayer pcb with all SMT parts soldered in.
  • PCBs in SMT, manufactured in Germany
  • Eurorack (3U) format, 18 hp
BOM / Build Documentation (PDF): Serge NTO

The NTO is available as a DIY (semi-)kit or - upon request - as complete (built) module. The Random*Source NTO euro kit contains:

  • Color printed front panel, 2mm, cnc made in germany
  • 1 Serge NTO euro pcb set (SMT, all SMT components mounted)

*** THIS IS NOT A FULL KIT (AND NOT A BUILT MODULE)! ***

Price: Module € 470 - Low Stock ::: Kit € 275 - Available again!

 

Serge TWS for Euro
Serge Triple Waveshaper for Euro TWS kit contents

Serge Triple+ Waveshaper (TWS+)

The TRIPLE WAVESHAPER (TWS) is a non-linear modifier which can transform a sawtooth wave into a sine wave. This classic module incorporates three independent waveshapers for modifying synthesizer waveforms or for processing signals from preamplified instruments. Although originally designed as a waveshaper for early Serge oscillators, this module has been found to be a excellent modifier of electronic and acoustic sounds, and is highly recommended for subtle timbral modifications beyond the range of simple oscillator/filter patches.

The R*S version extends the classic TWS concept:

  • +1: An additional (4th) waveshaper has been added (right after the first / bottom waveshaper) that can be dialed in smoothly using the +1 knob. Turned down (CCW) the bottom section acts as in the original (as if that additional waveshaper would not exist). Turned up (CW) the bottom section is actually 2 waveshapers in series.
  • Switches to link the 3 sections - bottom to top. Using these switches all sections can be set to act in series, starting at the bottom and ending at the top, providing the combined effect of 3 to 4 waveshapers (or anything in between) using the +1 knob.
  • Linking only the middle and top section and turning the +1 knob up (to have 2 sections in the bottom) allows you to use the module for isntance as two independent 2-stage waveshapers (using bottom in and out for one and middle in and top out for the other) - e.g. for stereo processing.

The Random*Source version is a licensed and authorized adaption of the original Serge design.

Build documentation: Serge TWS+ euro BOM / Build doc

Some details of the Random*Source Serge TWS kit:

  • Under licence from and in cooperation with Serge Tcherepnin
  • 4th waveshaper can be gradually added
  • perfect companion for a dsg mk2
  • pcb in SMT, manufactured in Germany
  • No wiring needed
  • Eurorack format (3U), 18 hp
  • Power consumption: 20mA @ +12V, 10mA @ -12V
  • Module depth: < 30mm

The Random*Source TWS euro kit contains:

  • Color printed front panel, 2mm, cnc made in germany
  • 1 Serge TWS euro pcb (SMT, all SMT components mounted)

*** THE SET IS NOT A FULL KIT !! ***

Price: NEW! Complete Module: € 280 --- Kit: € 130

 

Serge DSG mk2 for Euro Serge DSG mk2 for Euro

Some complex waveforms generated by a single DSG mk2:

Serge DSG mk2 waveforms

DSG mk2 tracking test:

Serge DSG mk2 (basic) kit contents:

Serge DSG mk2 kit content

Serge Dual Universal Slope Generator mk2 (DSG)

The Serge Dual Universal Slope Generator (DSG) is probably the most versatile module of a Serge Modular system, incorporating a wide range of functions for both CV and audio. Some functions for which one Slope Generator can be used: VC Transient Envelope Generator, VC LFO, VC Portamento device, Envelope Follower (Detector), VC Pulse Delay (Monostable), Sub-Harmonic Series Generator (Divider), Audio Oscillator with variable waveform symmetry (saw to triangle), Non-Linear Audio Processor (low-fidelity VCF).

From the catalog: "The Universal Slope Generators are unity gain voltage followers with voltage controllable slopes. The range of control is exponential, extremely wide, and the Rise and Fall times can be controlled independently. The range of the Slope Generator is from sub-sonic to high audio frequency. Trigger inputs and trigger outputs allows each section of this dual module to function as a transient (envelope) generator, pulse delay, or in a "cycling mode" (to produce an LFO or clock). Since the Rise and Fall times are voltage controllable, this adds another dimension to the above functions.

The DSG mk2 version has been optimized for audio performance and speed/precision. The top section covers a frequency range up to more than 10kHz. It also offers improved tracking and some temperature compensation.

Now - for the first time and licenced by Serge - the DSG is available as an updated (mk2) version kit for Euro.

Build documentation: Serge DSG mk2 euro BOM / Build doc

Some details of the Random*Source Serge DSG kit:

  • Under licence from and in cooperation with Serge Tcherepnin
  • Separate VC inputs for Rise and Fall
  • improved tracking (up to 4 octaves)
  • Pulse out with 50% duty cycle in the top
  • Limited editionb>/ new version with (some) temperature compensation
  • Uses selected audiophile parts for superior audio performance (up to >10kHz)
  • DSG mk2 board in SMT, manufactured in Germany
  • No wiring needed
  • Eurorack format (3U), 26 hp
  • Power consumption: 90mA @ +12V, 80mA @ -12V
  • Module depth: < 40mm (1.5")

The Random*Source DSG euro kit contains:

  • Color printed front panel, 2mm, cnc made in germany
  • 1 Serge DSG mk2 wuro main pcb (SMT, all SMT components mounted)
  • 1 matching panel pcb (SMT, all SMT components mounted)
  • As an option*: 4 ON-OFF-ON sub-mini switches

*** THIS IS NOT A FULL KIT (AND NOT A BUILT MODULE)! ***

Price: Kit € 220 - FRESH ARRIVAL! -
Price: *Kit with 4 expo switches € 216 - IN STOCK -

 

StereoMixer for Euro

Equal Power Stereo Mixer

The Stereo-Mixer is a 2 input, 2 output equal-power panning mixer designed combine the sound of the famous Serge VCAs with the most audiophile parts available today in a special edition for Eurorack - NJR Muses op-amps and THAT2180 VCA chips. The 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 as Gain CV input (with attenuator) which allows 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 appr. +/-11V when overdriven, so make sure your other equipment (AD converters, mixers) can handle this

  1. Balanced Outputs, using „a new generation of monolithic audio differential line drivers offering improved performance over conventional crosscoupled designs“ for low noise and distortion. These outputs can be connected to balanced or unbalanced equipment (amplifiers, A/D converters...)
  2. NJR Muses op-amps in the audio path.
  3. Optimized value set and easier calibration / setup.

Two Aux inputs can also be used to chain mixers. The output is available at a pair of banana jacks as well as (6.35mm / 1/4") TRS jacks (phone connectors) for connecting to external amplifiers, ADCs etc.

Build documentation: Stereo Mixer euro BOM / Build doc
The "Donks" demo uses only the Stereo-Mixer (4U version), mostly as a waveshaping tool):

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

  • Balanced line outputs (6.3mm) and minijacks
  • pcbs in SMT, manufactured in Germany
  • No wiring needed
  • Eurorack format (3U), 18 hp
  • Power consumption: appr. 100mA @ +12V, 100mA @ -12V
  • Module depth: appr. 40mm

The Random*Source Stereo Mixer euro kit contains:

  • Color printed front panel, 2mm, cnc made in germany
  • 1 Stereo Mixer pcb set (SMT, all SMT components mounted)

*** THE SET IS NOT A FULL KIT !! ***

Price: Kit: € 250 --- SOON: Complete Module: € 430


Serge :N Comparator (NCOM) for Euro

Serge Divide by N Comparator (÷NCOM)

The Serge Divide by N Comparator (NCOM) is a rare, much sought-after and very essential Serge module covering a number of functions: comparator, voltage-controlled pulse divider, and voltage-controlled staircase generator.

The ÷N COMPARATOR consists of two sections - a comparator (right side) and a voltage-controlled pulse divider (left side). The ÷N output of the pulse divider sends out a pulse on every N-th comparator pulse where N is a number from 1 to 31. N can be (pre-)set with the divider’s control knob (1 ÷N) and can by changed with a control voltage. The VC knob (attenuator)on the bottom of the left side determines how much effect the control voltage has on “N”. In addition, the divider generates a staircase waveform with N steps. This can be used to produce whole-tone steps when run into the 1V/Oct input of a VCO or as a stepped control voltage to change for instance the cutoff of a filter.

The comparator provides a number of useful “housekeeping functions”: Logical decisions (if the +input is greater than the -input, the output will be high, otherwise low), Level detection (whenever a variable waveform crosses the theshold, a pulse is generated ), Pulse width modulation or Rectifying a waveform (e.g. a sine or triangle wave). (More applications and info in the Build Doc).

Now - for the first time and licenced by Serge - the NCOM is available as DIY kit for Euro.

Build documentation: Serge NCOM BOM / Build doc

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

  • Under licence from and in cooperation with Serge Tcherepnin
  • Precision voltage source for improved accuracy
  • 2 extra attenuators
  • No wiring needed
  • Eurorack format (3U), 10 hp
  • Power consumption: 20mA @ +12V, 18mA @ -12V
  • Module depth: < 40mm (1.5")
NCOM kit contents

The Random*Source Kit contains:

  • Color printed front panel, 2mm, cnc made in germany
  • 1 Serge NCOM Euro pcb (through-hole, no components mounted)
  • 1 matching panel pcb

*** THIS IS NOT A FULL KIT (AND NOT A BUILT MODULE)! ***

Price: Kit € 54 - IN STOCK -


Serge Variable Slope filter (VCFS) for Euro Serge VCFS

Serge Variable Slope filter (VCFS)

The Serge Extended Variable Slope filter (VCFS) is a unique filter of the Serge system, covering a wide range of sonic character. According to the 1983 Serge catalogue, the “VARIABLE SLOPE VCF (VCFS) allows the amount of filtering to be dynamically controlled, from barely perceptible filtering to highly resonant, sharp cut-offs. With the variable slope control in the center position, the VCFS acts as a typical flat-response VCF, with high, low, and band~pass outputs available simultaneously. The slope of the cut-off is 12 db/octave. As the control is moved toward the maximum position, the resonance of the filter increases, so that the cut-off becomes sharper."

Now - for the first time and licenced by Serge - the VCFS is available as DIY kit for Euro.

Build documentation: Serge VCFS BOM / Build doc

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

  • Under licence from and in cooperation with Serge Tcherepnin
  • Designed for High-end VCAs (THAT2180)
  • New Q knob for increased resonance
  • No wiring needed
  • Eurorack format (3U), 14 hp
  • Power consumption: 40mA @ +12V, 40mA @ -12V
  • Module depth: < 40mm (1.5")
VCFS kit contents />

The Random*Source Kit contains:

  • Color printed front panel, 2mm, cnc made in germany
  • 1 Serge VCFS Euro pcb (through-hole, no components mounted)
  • 1 matching component pcb

*** THIS IS NOT A FULL KIT (AND NOT A BUILT MODULE)! ***

In addition, you can also get some "Unfancy Fancy Parts" - unfancy as instead of using lots of plastic bags and cool stickers, the parts come in a single (recycled!) bag with a content list:

  • 2x 15pF Mica caps, 5%
  • 2x 220pF Styroflex, 2%
  • 1x 270pF Mica, 2%
  • 2x OPA2134
  • 2x THAT2180C
  • FREE 1x BCM847DS (SMT) / OPTIONAL!

*** (AGAIN) THIS IS NOT A FULL KIT ! ***

Price: Kit (without any parts) € 66 - IN STOCK -
Price: Kit with Unfancy Fancy parts € 89 - IN STOCK -

 

Serge Variable Resonance filter (VCFQ) for Euro Serge VCFQ

Serge Variable Resonance filter (VCFQ)

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

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")
VCFQ kit contents />

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

*** THIS IS NOT A FULL KIT (AND NOT A BUILT MODULE)! ***

Price: € 66 - IN STOCK -


Serge Wave Multipliers for Euro Serge SSG

Serge Wave Multipliers (VCM)

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")
VCM bundle contents />

The Random*Source bundle contains:

  • Color printed front panel, 2mm, cnc made in germany
  • 1 Serge VCM Euro pcb (including SMT components reflow soldered in)
  • 1 matching component pcb

*** THIS IS NOT A FULL KIT (AND NOT A BUILT MODULE)! ***

Wave Multipliers (VCM) SMT bundle: € 170 - BACK IN STOCK!
NEW: Wave Multipliers (VCM) complete module - professionally (wave) soldered and calibrated: € 300 Intro price - few available!

 

Serge Resonant EQ for Euro Serge Resonant Equalizer main pcb

Serge Resonant Equalizer (EQ)

The RESONANT EQUALIZER (EQ) is a unique ten-band filter designed specifically for electronic sound synthesis and processing. Except for the top and bottom frequency bands, the bands are spaced at an interval of a major seventh. The Resonant Equalizer is designed to produce formant peaks and valleys similar to those in acoustic insstruments.

There are three equalized outputs: the two COMB outputs provide the sums of the two alternate filter bands, while the two top outputs are the (identical) mix of all filter bands. Please note that there is no sharp separation between the bands, moving any frequency knob will have an influence on both COMB outputs. This equalizer is special in that the bands can be set to be resonant: when the knobs are in the middle position, the response at the main EQ Output is flat. When the knobs are positioned between the 9 and 3 o’clock position, up to 12 db of boost or cut is set at the band. If the knob is set beyond the 3 o’clock position, the band will become resonant, simulating the natural resonance of acoustic instrument formant structures. Below the 9 o’clock position, increased band rejection is achieved.

The Random*Source version of the filter is a licensed and authorized adaption of the legendary Serge equalizer for Eurorack. It adds an input mixer with 2 inputs that can be built/used to attenuate or amplify/distort the input signal(s) before they are sent into the EQ and a Feedback section (knob and phase switch) which allows to feed back the output signal or the inverted output signal (depending on the Phase switch). Adding inverted feedback leads to phase cancellation effects - unlike the “normal” feedback, level decreases and the signal thins out.

Now - licenced by Serge - the legendary EQ is available as DIY kit for Eurorack.

Build documentation: Serge Resonant EQ BOM / Build doc

Some details of the Random*Source Serge Resonant EQ module kit:

  • Under licence from Serge Tcherepnin
  • Input mixer / attenuator / amplifier
  • Feedback knob and Phase-switch to add normal or inverted feedback
  • 100% through-hole (SMT bypass caps optional)
  • No obsolete parts needed
  • No wiring needed
  • Eurorack format (3U), 18 hp
  • Power consumption: 100mA @ +12V, 100mA @ -12V
  • Module depth: < 38mm (1.5")
Resonant EQ kit contents />

The Random*Source Kit contains:

  • Color printed front panel, 2mm, cnc made in germany
  • 1 Serge Resonant EQ Euro pcb (no parts soldered in!)
  • 1 matching component pcb

*** THIS IS NOT A FULL KIT (AND NOT A BUILT MODULE)! ***

Price: Res EQ kit: € 78 - LOW STOCK! -


Serge Smooth & Stepped Generator for Euro Serge SSG

Serge Smooth & Stepped Generator (SSG)

The Serge Smooth & Stepped Generator (SSG) is a complex multi-functional module which can be patch programmed to provide various slew and sample functions both for audio and CV signals. It is one of the essential Serge modules.

The Smooth section will place a positive and negative slew on input voltage transitions for lag effects, voltage controlled portamento and for low frequency filter applications.” In Cycle-mode (cycle jack patched to the input), the Smooth side “will oscillate yielding a voltage controlled triangle wave LFO. A high level into the HOLD input will enable the Smooth Function to be used as a track-and-hold circuit with voltage controlled slew rate.

The Stepped function can be used as a sample-and-hold with voltage controlled slew rate limiting. In Cycle mode, a pulse applied to the Sample input will generate complex staircase waveforms for control voltage applications and for use as audio signals.

The Coupler is an internal comparator which compares the output levels of the Smooth and the Stepped Generators. This output is useful for generating complex control voltages or random voltages.

The Random*Source version of the Smooth & Stepped Generator for Euro is a licensed and authorized adaption of the original Serge design that provides an increased audio range of the Smooth Generator and a bipolar (“hot”) Coupler output in addition to the regular (unipolar) Coupler output.

Now - for the first time ever and licenced by Serge - the SSG is available as DIY (SMT) kit for Euro.

Build documentation: Serge SSG BOM / Build doc

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

  • Under licence from Serge Tcherepnin
  • Main pcb in SMT, containing almost all components (reflow soldered in)
  • No obsolete parts needed
  • No wiring needed
  • Eurorack format (3U), 18 hp
  • Power consumption: 30mA @ +12V, 30mA @ -12V
  • Module depth: < 35mm (1.5")
SSG kit contents />

The Random*Source Kit contains:

  • Color printed front panel, 2mm, cnc made in germany
  • 1 Serge SSG Euro pcb (including SMT components reflow soldered in)
  • 1 matching component pcb

*** THIS IS NOT A FULL KIT (AND NOT A BUILT MODULE)! ***

Price: SSG SMT kit: € 150 - BACK IN STOCK -
SSG built module: - 1 available

 

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