Serge Modular

"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. Original dimensions ("4U" panel height) and the typical look and feel of banana jacks, classic knobs and the grid arrangement of panel elements are preserved.

The modules on this page are all in the classic Serge format - dimension ("4U" panel height) format The modules on this page are all in the classic Serge dimension ("4U" panel height) with classic Serge dimension ("4U" panel height) and the typical banana jacks.

Looking for Serge in Euro (3U)?. Check out our Serge for Euro page.

Serge New Timbral Oscillator + XFader Serge NTO

Serge New Timbral Oscillator (NTO) / XFADER

The NTO is Serge's legendary and most ambitious oscillator. The R*S XFader is an equal power design using highend THAT VCAs and features a variable VCA character to emulate the behavior of vintage Serge VCAs.

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:

  • NTO: new PULSE OUT
  • NTO: variable oven temperature
  • NTO on multilayer pcb with all SMT parts soldered in.
  • XFADER: balanced out (not on panel)
  • PCBs in SMT, manufactured in Germany
  • 4x4 format (4U high - this is not Eurorack!)
Serge NTO pcbs in SMT
BOM / Build Documentation (PDF): Serge NTO R*S XFADER

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

  • Aluminum front panel, 2mm, cnc made and anodized in germany
  • 1 Serge NTO pcb set (multilayer, all SMT components installed)
  • 1 XFADER pcb set (SMT, all SMT components installed)

Price: € 390 - Available now - LIMITED STOCK -

*** This is 4U format - not eurorack! ***


Serge SSG DSG Noise aka Carnivore Serge Carnivore Serge carnivore back Tracking comparison: STS Creature (left) vs R*S DSG mk2 (right):

Serge "Carnivore"
Serge SSG / DTG / Noise

“Carnivore” combines three key Serge modules in only 4 inches: a Serge Smooth & Stepped Generator (SSG), a Serge Noise Source and a Dual Universal Slope Generator mk2 in a slim, oscillator-oriented version covering the functionality of what’s sometimes called “VC TIMEGEN” oscillator (and more). The SSG is a complex multi-functional module which can be patch pro- grammed to provide various slew and sample functions. 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. Serge Noise Source provides both white and pink noise waveforms as well as a S/H SRC that generates a special (“noisy”) waveform as an ideal input for Sammple & Hold functions to produce random voltages of equal probability.

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

Some details of the Random*Source "Carnivore" module:

  • SSG with improved audio rates and "hot" coupler out"
  • DSG mk2 ("TimeGen Osc") with improved tracking (up to 4 octaves), temperature compensation, maximum separation between sides, using selected audiophile parts for superior audio performance (up to >10kHz)
  • Serge Noise Source
  • PCBs in SMT, manufactured in Germany
  • 4x4 format (4U high - this is not Eurorack!)
Serge carnivore pcbs in SMT
BOM / Building doc (PDF): Serge "Carnivore" BOM / Build doc

"Carnivore" is available as a DIY (semi-)kit or - upon request - as complete (built) module. The "Carnivore" kit contains:

  • Aluminum front panel, 2mm, cnc made and anodized in germany
  • 1 Serge DSG mk2 pcb (SMT including all SMT components)
  • 1 Serge SSG and Serge Noise pcb (SMT including all SMT components)
  • 1 matching panel pcbs (4" wide)

Price: € 320 - Available now - LIMITED STOCK -

*** This is 4U format - not eurorack! ***


Serge DTG Extended ADSR Serge DTG-ADSR

Serge Slopes (DTG) / Extended ADSR

This 4x4 module combines a Dual Universal Slope Generator mk2 in a slim version with an Extended ADSR. 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. This 2" incarnation is powerful both in the audio range as well as clock and envelope generator. Thanks to the audio inputs, it can also be used as a filter / LPG. The DSG mk2 version has been optimized for audio performance and speed/precision. The left side covers a frequency range up to more than 10kHz. It also offers improved tracking and some temperature compensation.

The Extended ADSR is a complex envelope generator that not only uses the four segment envelope normally encountered in synthesizers, but is designed with extra features such as an initial voltage controllable delay time, voltage control of each segment, switchable slope forms, and a master voltage control. Each segment may be manually set and voltage controlled. In addition to the normal Attach, Decay, Sustain, and Release segments, an Initial Delay time is included. A master 1V/OCT inout allows to control all slope times for effects such as decreasing the entire envelope time as the pitch of an associated oscillator increases - a phenomenon is typical of many acoustic instruments.

Some details of the Random*Source DTG-ADSR module:

  • DSG mk2 ("TimeGen Osc") with improved tracking (up to 4 octaves), temperature compensation, maximum separation between sides, using selected audiophile parts for superior audio performance (up to >10kHz)
  • Serge Extended ADSR (2017 version)
  • New version of ExtADSR: all transistors installed
  • 4x4 format (4U high - this is not Eurorack!)
BOM / Documentation (PDF): Serge "Slopes" Serge ExtADSR 2017

"Slopes / ExtADSR" is available as a DIY (semi-)kit or - upon request - as complete (built) module. The kit contains:

  • Aluminum front panel, 2mm, cnc made and anodized in germany
  • 1 Serge DSG mk2 pcb (SMT including all SMT components)
  • 1 Serge ExtADSR pcb (mostly TH, including some SMT parts)
  • 2 matching panel pcbs

Price: € 300 - Available now -   -

*** This is 4U format - not eurorack! ***


Serge Dual Universal Slope Generator Serge DSG mk2 pcbs in SMT Serge DSG mk2 + CV Pro Tracking comparison: STS Creature (left) vs R*S DSG mk2 (right):

Serge Dual Slope Generator mk2 &
Serge CV Processor

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.

Some details of the Random*Source DSG mk2 module:

  • Separate VC inputs for Rise and Fall
  • improved tracking (up to 4 octaves)
  • Uses selected audiophile parts for superior audio performance (up to >10kHz)
  • DSG and CV-Processor boards in SMT, manufactured in Germany
  • 4x4 format (4U high - this is not Eurorack!)
Serge DSG mk2 pcbs in SMT

The Random*Source DSG mk2 comes in 2 variants which differ in the top section (only):

  • contemporary provides a (red = gate) Pulse output with a fixed duty cycle (instead of the bipolar out). Please note that the panel will (incorrectly) say "BIPOLAR" (see photo) but the red banana jack should make things obvious.
  • classic features the (black) Bipolar output on both sides.
Either variant of the DSG mk2 is available as a DIY (semi-)kit or as complete (built) module. The DSG mk2 kit contains (see DUSG mk2 build docs):

  • Aluminum front panel, 2mm, cnc made and anodized in germany
  • 1 Serge DSG mk2 pcb (SMT including all SMT components)
  • 1 matching panel pcbs (3" wide)
  • 1 Serge CV Processor pcb (SMT including all SMT components)

Available now - LIMITED STOCK -
Complete module takes 7-15 days (depending on banana colors)

*** This is 4U format - not eurorack! ***

 

Serge Variable Q Filter / Stereo Mixer Serge Filter and Stereo Mixer by RandomSource

Stereo Mixer V1.2 in SMT with balanced outputs:

Stereo Mixer in SMT with balanced Outputs

Serge Variable Q Filter / R*S Stereo Mixer

The combination of the extremely versatile Serge Variable Q Filter (VCFQ) and the R*S Stereo Mixer / Panner is an ideal output module which combines high-end audio specs (including balanced outputs) with massive sound-shaping power.

The unique Serge Variable Q Filter (VCFQ) is an excellent 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. With the support and approval of Serge Tcherepnin, the Random*Source version of the filter uses high-end VCAs by THAT for superb audio performance.

The Equal Power Stereo Mixer / Panner by Random*Source is designed to emulate the behavior of the famous Serge VCAs. It uses some of the best audio components available today including THAT2180 VCA chips. Version 1.1 contains a number of additions and improvements that were adopted in surface mounted technology (SMT):

  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. Burr-Brown quad op-amps (OPA4134) in the audio path.
  3. Optimized value set and easier calibration / setup.
The R*S Stereo-Mixer has two independent channels for stereo panning and provides level control (or enveloping) as well as voltage controlled panning. Two Aux inputs allow to mix in other signals (not affected by control voltages or knobs) and 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.

This demo uses only the Stereo-Mixer (mostly as a waveshaping tool):

The Serge VCFQ / R*S SM is available as a DIY (semi-)kit:

  • Aluminum front panel, 2mm, cnc made and anodized in germany
  • 1 Serge VCFQ main pcb (2" wide, Thrugh-hole - no parts included)
  • 1 Serge VCFQ panel pcb (2" wide, - no parts included)
  • 1 R*S Stereo Mixer pcb (2" wide) with all SMT components (including balanced line drivers, Burr-Brown op-amps) reflow soldered in - only very few through-hole components (THAT2180s, audio capacitors, trimmers ...) have to be added.
  • 1 R*S panel pcb for the Stereo Mixer

Available now - € 220 - LIMITED STOCK! -

*** This is 4U format - not eurorack! ***

 

Serge Sequencer / Programmer 8 Serge Sequencer / Programmer

Serge Sequencer / Programmer 8

The Serge Sequencer / Programmer 8 (SQP8) can be used as a push-button, manual programmer and/or sequencer. The pushbuttons not only allow to select a certain stage, but also to set the length of the sequence in performance while a sequence is running. Other sequencieng capabilites include RESET, UP/DOWN and HOLD pulse inputs as well as a GATE output which allows to use the pushbuttons as a simple mini-keyboard. Another unique feature is the A minus B output which outputs the difference between the A and the B output.

The R*S version is optimized for speed and use in the audio range. This allows the use of the sequencer similar to a wavetable oscillator - using a clock of 8kHz (eg from a DSG mk2) generates output waveforms with a base frequency of 1kHz that still have sharp edges.

Some details of the Random*Source Sequencer module:

  • Blazingly fast - suited for audio (ab)use
  • GATE OUT - pushbuttons can be used as a mini-keyboard
  • Configurable RESET input
  • Multilayer pcb in SMT (all SMT parts installed), manufactured in Germany
  • 4x4 format (4U high - this is not Eurorack!)
Serge SEQ 8 module
Build documentation: Serge Sequencer 8 4x4

The Serge Sequencer / Programmer is available as a DIY kit:

  • Aluminum front panel, 2mm, cnc made and anodized in germany
  • 1 SQP8 main pcb (4" wide, SMT including all SMT components)

Available now - € 200 - NEW VERSION / IN STOCK! -

*** This is 4U format - not eurorack! ***


Serge Smooth & Stepped + Random Source Serge DUSG pcb in SMT

Serge Smooth & Stepped Generator
Random Source

The Serge Smooth and Stepped Generator (SSG) is an essential Serge module with an enormous variety of uses both for CV and audio. According to the 1979 catalogue, “it is a complex multi-functional module which can be patch programmed to provide various slew and sample functions. The Smooth section will place a postitve 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 traiangle 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 funtion 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 Serge Random Source (RS) combines a Serge Random Voltage Generator (RVG, left column) and a Serge Noise Source (right column) in one module. As the name suggests, the Random Voltage Generator produces random voltages which vary in a smooth or in a step-wise manner. Random timing pulses are also available. The Noise Source (NOI) provides both white and pink noise waveforms. The S/H SRC generates a special (“noisy”) waveform as an ideal input for Sample & Hold functions to produce random voltages of equal probability (similar to a 1/F distribution function). In addition, the Noise Source features a random voltage output which can be stepped through random voltages by sending trigger pulses or using the pushbotton.

Serge DUSG pcb in SMT

Some details of the Random*Source SSG + RS module:

  • SSG module with enhanced audio range
  • Carefully selected components (Burr-Brown Op-Amps, C0G caps)
  • SSG and RS Boards in SMT, manufactured in Germany
  • 4x4 format (4U high - this is not Eurorack!)

The Random*Source SSG+RS module is available as a DIY (semi-)kit containing:

  • Aluminum front panel, 2mm, cnc made and anodized in germany
  • 1 Serge SSG pcb (SMT including most components except for trimmers etc.)
  • 1 Serge RS (SSG+Noise) pcb (SMT including most components except for trimmers etc.)
  • 1 matching component pcbs (4" wide)
  • - no other parts or components! -

Available now - € 280 - BACK IN STOCK!


Serge Variable Slope and Variable Resonance filters

Serge Filters

The Serge Variable Slope filter (VCFS) and Variable Resonance filter (VCFQ) is an combination of the two famous and essential filters of the Serge system. The The VARIABLE Q VCF (VCFQ) is an excellent 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. The Variable Slope filter (VCFS) allows the amount of filtering to be dynamically controlled as well, from barely perceptible filtering to highly resonant, sharp cut-offs. The VCFS has an unrivaled unique, organic characteristic. With the support of Serge Tcherepnin, the Random*Source version adds abjustable resonance - expanding the filter's character way beyond what's been possible with the original version.

Serge DUSG + CV Pro

Some details of the Random*Source Serge filters module:

  • Under licence from Serge Tcherepnin
  • High-end VCAs (THAT2180) - no matching of transistors required
  • Additional Resonance pot (Q) on the VCFS
  • No wiring needed (except for one switch)
  • 4x4 format (4U high - this is not Eurorack!)

The Random*Source Kit contains:

  • front panel, 2mm, cnc made and anodized in germany
  • 1 Serge VCFS pcb (through-hole, no components mounted)
  • 1 Serge VCFQ pcb (through-hole, no components mounted)
  • 2 matching component pcbs (2" wide)

Price: € 140 - AVAILABLE AGAIN! -

 

Serge Dual Extended ADSR

Serge Dual Extended ADSR

The Serge Dual Extended ADSR (ADSR) contains two complex envelope generators. Each ADSR uses not only the four segment envelope normally encountered in synthesizers, but is designed with extra features such as an initial voltage controllable delay time, voltage control of each segment, switchable slope forms, and a master voltage control. Each segment may be manually set and voltage controlled. In addition to the normal Attach, Decay, Sustain, and Release segments, an Initial Delay time is included. A master 1V/OCT inout allows to control all slope times for effects such as decreasing the entire envelope time as the pitch of an associated oscillator increases - a phenomenon is typical of many acoustic instruments.

Some details of the Random*Source ExtADSR module:

  • Super-matched Transistor Array (THAT340) - no matching of transistors required.
  • CV-response can be set from "classic" (5V = 5 octaves) up to 10 octaves for more drastic effects.
  • Optional footprint for a BCM847 (matched pair in SMT)
  • 4x4 format (4U high - this is not Eurorack!)

The Random*Source ADSR module is available either as a DIY kit or as full module:

  • front panel, 2mm, cnc made and anodized in germany
  • 2 Serge ADSR pcbs (through-hole, some SMT parts components mounted)
  • 2 matching component pcbs (2" wide)

Status: IN STOCK (allow 7-10 days for complete module)

 

Serge Divide and Compare Serge Divide &Compare

Serge Divide & Compare

Divide & Compare provides a number of mathematical and logical functions for all sorts of rhythmic effects. The module combines a Serge Divide by N Comparator with a Pulse Divider and Boolean Logic.

The Serge ÷N COM is a sought-after and essential Serge module (1" wide) covering a number of functions: comparator, voltage-controlled pulse divider, and voltage-controlled staircase generator.

As the name suggests, the Pulse Divider takes a pulse train in and provides multiple simultaneous divided outputs, including odd-numbered divisors like 5 or 7 - great for creating polyrythms. The module can be jumpered so that the top input of the Inverter in the Boolean Logic section (also) acts as a RESET input. Boolean Logic offers two inverters as well as OR, AND, and XOR (exclusive or) gates and is ideal combine triggers in various ways. Like the Pulse Divider, it can be used in the audio range, too. offering two inverters, and OR, AND, and XOR gates.

For those interested in history, the Pulse Divider is based on a core design by Ken Stone - many thanks to Ken! Pulse Divider and Boolean Logic have been part of many Serge Systems even though they are not not original Serge designs. Divide & Compare is a great companion for the Sequencer 8.

Some details of the Random*Source Divide&Compare module:

  • RESET input for the Pulse Divider
  • New NCOM version (SMT) - more precise than ever and all SMT parts installed.
  • All pcbs are made in Europe
  • 4x4 format (4U high - this is not Eurorack!)
Build documentation: Serge NCOM Pulse Divider

The Serge Divide&Compare is available as a DIY kit:

  • Aluminum front panel, 2mm, cnc made and anodized in Germany
  • NCOM main pcb - new SMT version! - (1") and panel pcb (1)
  • Pulse Divider main pcb (2") and panel pcb (3")
  • 3 low current LEDs - no other parts included!

Available now - € 170 - IN STOCK! -

*** This is 4U format - not eurorack! ***


Serge VCM + RES-EQ

Serge Wave Multipliers and Resonant EQ

The Serge Wave Multipliers, one of the essential modules of a Serge Modular system, dynamically process the input waveform to produce new harmonically-related overtones. According to the 1982 catalog, "The nearest we can come to describing the unique sound qualities (there are three different sections) is to say that 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."

Again to quote the catalog: "The Serge 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, all other bands are spaced at an interval of a major seventh. This non-standard spacing avoids the very common effect of an accentuated resonance in one key, as will be the effect from graphic equalizers with octave or third-octave spacing between bands. Spacing by octaves will reinforce a regular overtone structure for one musical key, thereby producing regularly spaced formants accenting a particular tonality. The Resonant Equalizer's band spacing are much more interesting, producing formant peaks and valleys that are similar to those in acoustic instument sounds.

The Random*Source Kit contains:

  • front panel, 2mm, cnc made and anodized in germany
  • 1 component pcb (4" wide for both modules) matching CGS 113 v1.1 and CGS202 v1.1 featuring the (active) circuitry for the added Feedback option.

Price: (without CGS pcbs) € 70 - OUT OF STOCK!


Serge PCBs

Some Random*Source pcbs for Serge modules are available here. These boards are not recommended for beginners, some prior soldering and assembly experience is highly recommended. Please not that these pcbs are for 4U format (6" long).

Serge NTO pcb

Serge New Timbral Oscillator (NTO)

The Serge NTO, Serge's legendary oscillator featuring variable wave outputs and much more, is now available as a SMT pcb set with all SMT parts already reflow soldered in.

Build documentation: Serge NTO BOM / Build doc

The Random*Source pcb kit contains (only!):

  • 1 Serge New Timbral Oscillator (NTO) multilayer pcb (6" x 3") - all SMT parts installed!
  • 1 Serge New Timbral Oscillator (NTO) panel pcb by R*S (6" x 3")

Price: € 260 - LIMITED STOCK

Serge NCOM pcb

Serge Divide by N Comparator (÷N COM)

The Serge ÷N COM is a sought-after and essential Serge module (1" wide) covering a number of functions: comparator, voltage-controlled pulse divider, and voltage-controlled staircase generator. The Random*Source version of the Serge ÷N COM consists of a main pcb and a matching component pcb serving as an interface to the front panel.

Build documentation: Serge NCOM BOM / Build doc

The Random*Source pcb kit contains (only!):

  • 1 Serge Divide by N Comparator (÷N COM) by R*S (6" x 1")
  • 1 NCOM component pcb by R*S (6" x 1")

Price: :-( - OUT OF STOCK


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