"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.
Special editon (fancy pushbuttons):
The SEQ XL is a modern incarnation of Serge's analog sequencer / programmer. 8 stages. 2 rows of CV output. A - B (A minus B) outouts the difference between A and B (-5 to 5V range). The length of sequences can be set via the pushbuttons - while a sequence is running. RESET, UP/DOWN, HOLD inputs. Switch to start / stop the sequencer. PULSE STAGE SELECT inputs allow selecting specific stages. great at audio rates. ALL GATE output goes high when any button is pressed (or a stage is selected by a pulse input) and allows the use of the SEQ8 as a simple mini-keyboard.
The SEQ8XL is available as a complete (built) module os as a DIY (semi-)kit (color printed front panel made in Germany + pcb with all SMT installed, this is not a "full kit"!).
Module (standard) € 540 - ships within 1-2 weeks
Module (limited, 4U-style buttons) € 600 - low stock
DIY kit (standard) € 350 - in stock
The 2017 RING is an improved version of the late Serge Ring Modulator (R9), designed by Serge himself for Random*Source in 2017, more than 40 years after the launch of the Serge Modular system. According to Serge, the RING is one of the most sophisticated modules in the Serge system. The new version has been developed by Serge for and in close cooperation with Random*Source.
Some details of the Random*Source RING module:
The RING is available as a DIY (semi-)kit or - upon request - as complete (built) module. The Random*Source RING euro kit contains:
! THE KIT IS NOT A FULL KIT - DOES NOT CONTAIN POTS, KNOBS OR TH-PARTS !
Kit € 190 - back in stock! ::: Module € 290 - 1 in stock! :::
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:
The NTO is available as a DIY (semi-)kit or - upon request - as complete (built) module. The Random*Source NTO euro kit contains:
*** THIS IS NOT A FULL KIT (AND NOT A BUILT MODULE)! ***
Price: Module € 470 - In Stock ::: Kit € 275 - Back in Stock!
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:
The Random*Source version is a licensed and authorized adaption of the original Serge design.
Some details of the Random*Source Serge TWS kit:
The Random*Source TWS euro kit contains:
*** THE SET IS NOT A FULL KIT !! ***
Price: NEW! Complete Module: € 280 --- Kit: € 160
Some complex waveforms generated by a single DSG mk2:
DSG mk2 tracking test:
Serge DSG mk2 (basic) kit contents:
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.
Some details of the Random*Source Serge DSG kit:
The Random*Source DSG euro kit contains:
*** THIS IS NOT A FULL KIT (AND NOT A BUILT MODULE)! ***
Price: Kit € 220 - FRESH ARRIVAL! -
Price: *Kit with 4 expo switches € 236 - IN STOCK - MODULE: € 450 - LOW STOCK -
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
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.
Some details of the Random*Source Stereo Mixer euro kit:
The Random*Source Stereo Mixer euro kit contains:
Price: Kit: € 250 BACK IN STOCK! --- NEW: Complete Module: € 430
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.
Some details of the Random*Source Serge NCOM module kit:
The Random*Source Kit contains:
*** THIS IS NOT A FULL KIT (AND NOT A BUILT MODULE)! ***
Price: Kit: € 150 - IN STOCK --- Module: € 240
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.
Some details of the Random*Source Serge VCFS module kit:
The Random*Source Kit contains:
*** 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:
*** (AGAIN) THIS IS NOT A FULL KIT ! ***
Price: Kit (without any parts) € 66 - IN STOCK-
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.
Some details of the Random*Source Serge VCFQ module kit:
The VCFQ is available either as a complete module (superslim, SMT) or as a DIY Kit (through-hole), containing front panel and pcb set, no other components - not a "full kit"!).
DIY kit:
Prices:
Module: € 310 - NEW!
DIY Kit: € 66 - IN STOCK -
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:
The Random*Source bundle contains:
*** 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: € 320 - few available!
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.
Some details of the Random*Source Serge Resonant EQ module kit:
The Random*Source Kit contains:
*** THIS IS NOT A FULL KIT (AND NOT A BUILT MODULE)! ***
Price: Res EQ kit: € 78 - LOW STOCK! -
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.
Some details of the Random*Source Serge SSG module kit:
The Random*Source Kit contains:
*** THIS IS NOT A FULL KIT (AND NOT A BUILT MODULE)! ***
Price: SSG SMT kit: € 180 - BACK IN STOCK -
SSG built module: - available