ST Modular is recognized for its DIY Euroack Modules that enable users to construct their modular synthesizers utilizing provided PCBs and self-obtained components. The range of modules offered encompasses oscillators, filters, sequencers, LFOs, envelope generators, and more, all designed by ST Modular to be exceptionally versatile. These modules facilitate a broad spectrum of sound manipulations and modulation avenues. NEW! PASSAT PASSIVE ATTENUATOR / 0HP NEW! HONEYEATER V3 CEM3340 ANALOG VCO WITH SUB-OSCILLATOR / 6HP NEW! CUERLY 3-CHANNEL STEREO MIXER WITH CUE / 6HP appetizer social media youtube modular grid instagram tiktok krakong euphoria Up

ST Modular has garnered acclaim for its DIY Eurorack Modules, which empower users to assemble personalized modular synthesizers using supplied PCBs and components they acquire themselves. ​ ST Modular is known for its original Eurorack circuit and PCB designs, created to inspire musicians and builders to explore modular synthesis. The designs enable users and licensed partners to realize personalized modular systems using dedicated PCBs and carefully developed circuit concepts. The portfolio includes oscillators, filters, sequencers, mixers, LFOs, envelope generators, effects, desktop synthesizers, and utility tools. Each design is developed in-house by ST Modular with a focus on versatility, musical character, and technical refinement. ST Modular began as a personal passion project driven by deep interest in electronics and sound design. The knowledge behind the designs was built through hands-on experimentation, breadboarding, technical study, and continuous exchange within the synthesizer community. Today, ST Modular operates as an independent small-scale design studio, reinvesting revenue into research, prototyping, and the development of new concepts. ST Modular focuses exclusively on circuit and PCB design. Manufacturing and distribution of physical products are carried out by independent licensed partners, who produce and bring their own products to market based on ST Modular designs. Depending on the partner, products may be available as PCBs, panels, DIY kits, or fully assembled modules. Stefan Tretau The S and T before Modular Hey! I am Stefan — a multi-faceted individual acknowledged for my roles as a devoted father, a loving husband, and a passionate musician. My journey in the world of music commenced during the early 2000s, where I found myself captivated by the realm of electronic music. Armed with a selection of electronic instruments, including a TB303, MC307, Micro Modular, and Xbase09, I embarked on a creative exploration that would come to define my artistic identity. In due course, my musical endeavors expanded beyond personal exploration. Live performances became an integral part of my artistic expression, and I successfully transitioned to releasing music on esteemed labels such as Heimatmelodie, Karmarouge, Fortek, Broque, and Night Drive, etching my presence into the electronic music landscape. Sometime around 2010, I took the step of founding my own label, ST RECORDS . The journey began with the vinyl release "Whatever Happened," and to this day, it remains the platform through which I share my music with the world. Yet, my interests transcended performance and production, leading me down the path of curiosity. In 2015, a pivotal juncture in my journey arrived when I grasped the intricate mechanics behind sound generation, particularly concerning Schmitt Triggers and Operational Amplifiers. This understanding marked the genesis of a fresh chapter, propelling me into a phase of self-guided learning encompassing circuit board design, soldering techniques , and culminating in the construction of my first DIY effect pedals. The allure of the "do-it-yourself" ethos grew stronger, prompting me to deepen my knowledge, craft my own schematics, and experiment with prototypes on breadboards. As my passion for modular synthesizers burgeoned, I embarked on a new venture in 2017 — designing my own Eurorack modules, such as "Switched", "Triple Tom", "Cyllene" and "Franz". The positive reception and subsequent demand from the DIY community inspired me to take the next step. I entered into a licensing agreement with Pusherman Productions (pushermanproductions.com), enabling them to manufacture and distribute their own products based on ST Modular circuit and PCB designs. This marked the genesis of ST MODULAR , an endeavor driven not by commercial aspirations but by a desire to innovate within the modular synthesis landscape. Unlike the usual practices in the industry, ST Modular is more about pursuing a personal artistic vision for me than fulfilling the wishes and ideas of others. I prioritize uncharted functionalities and distinctive designs, unfettered by market trends. This approach enables me to cater to my own artistic instincts while fostering a sense of community engagement among fellow enthusiasts. ST Modular remains a passion-driven project , not motivated by profit but by curiosity and creativity. Seeing musicians create music with designs I have developed is deeply rewarding and reflects the collaborative spirit at the heart of modular synthesis. For me, the journey is about the connection between electronics and sound, where circuits become instruments and ideas turn into music that reaches far beyond the workbench. Thank you for visiting these pages, Stefa n Up

Bills of Materials, Interactive BOMs, Stencils, PCB Pictures and other helpful information is available in the support section. BILLS OF MATERIALS & PCB PICTURES Bills of Materials, Interactive BOMs, Stencils, PCB Pictures and other helpful information is available in the support section. support documentation & assistance no manuals? There are no user manuals in file form. However, on the respective module pages, there are FUNCTIONAL DESCRIPTIONS and OPERATING INSTRUCTIONS provided . In addition, QUICK START GUIDES are linked under the descriptions for more complex modules. If you have any questions about the functionality of a module, please post them in the forum. modules no build guides? The PCBs are deliberately crafted for easy assembly. Many builders have discovered them to be SELF-EXPLANATORY and USER-FRIENDLY for soldering . Any specific instructions are clearly stated in the Bills of Materials (BOM). If you need general and detailed help on soldering the modules, please refer to the SOLDERING GUIDE FOR BEGINNERS available on the support page linked below. support questions? To ensure that the requested information reaches all members of the builder's community, KINDLY REFRAIN FROM SENDING EMAILS OR DIRECT MESSAGES. Instead, please SHARE YOUR INQUIRIES IN THE FORUM on this website. It is more likely that you will receive a quick response to a forum post than to an email or direct message sent via various other channels. forum notes for DIY builders It is recommended that ST modular PCBs are only soldered and assembled by experienced builders . If you intend to build an ST MODULAR module, you should be able to solder components in the 0603 footprint . If parts are missing from the DIY Full Kit you have purchased, please contact the seller directly . They are assembling the kits on their own and can offer replacement parts. The successful assembly , the safe power supply and the necessary calibration of the module are exclusively your responsibility . ST Modular operates solely as a licenser of modular designs and does not provide repair services! You are solely responsible for ensuring that the finished module does not damage other devices to which you connect it. ST Modular is not responsible if you injure yourself or others or damage your property or the property of others while building or using the circuit boards provided. No PCBs, complete kits or assembled modules will be available through st-modular.de in the future. If there are any further questions, don't hesitate to ask in the forum . It is more likely to receive a quick reply in the forum than a timely response to an email, Instagram direct message or Facebook message. iBOM For most larger ST Modular projects there are Interactive BOMs available. These will show the location of a selected part in an interactive *.html file in your standard browser. Additionally there is a „Highlight First Pin“ functionality that will help you to find the correct IC orientation. The iBOMs are located in the download section. Important note! Please be aware that the iBOM may occasionally display incorrect values. We recommend using the iBOM tool primarily to assist in identifying components on the board with greater ease. When it comes to obtaining and ordering parts, we advise relying exclusively on the Excel BOM. Up

Welcome to Authorized Dealers, your go-to resource for finding official retailers of ST Modular designs. Explore our curated list of trusted dealers offering high-quality ST Modular synthesizer kits and components. Whether you're a seasoned modular enthusiast or a beginner, find the perfect products to expand your Eurorack system. Shop confidently from authorized sellers to ensure genuine ST Modular designs and top-notch support. WHERE TO BUY? Independent manufacturers license ST Modular circuit and PCB designs to develop, manufacture, and distribute their own products under license, based on ST Modular design concepts. Authorized Manufacturers: pushermanproductions.com PCBs, Panels, Kits and Pre-Assembled Modules for Eurorack Builders (GBR) calsynth.com Made with Love in Los Angeles, California - Built & DIY Modules (USA) 3U-shop.de Kits & Parts and More…PCB Sets & Pre-Assembly (GER) tlm-audio.com Professionally built Modules made in Germany (GER) ears-modular.com Electronic Art Research Society is a small online shop that sells circuit boards, parts, and accessories for Eurorack-standard home-made synthesizers (JPN) 锡人乐器 (tin man synths) Official ST Modular dealer in China selling PCBs, DIY kits, pre-built modules, and components via Taobao and Xianyu (CHN) Please note Modular Addict (modularaddict.com) is currently not an authorized ST Modular partner. Some products offered there may not reflect the latest PCB revisions or panel updates. To ensure you receive the most current versions and to support ongoing development, please purchase ST Modular PCBs and panels from one of the authorized sellers listed on this website. Compliance & Manufacturing ST Modular develops circuit concepts and PCB designs for electronic audio applications. Physical products based on ST Modular designs are manufactured and distributed by independent licensed partners. The respective manufacturer is responsible for CE conformity, regulatory compliance, product safety documentation, traceability and customer support. For compliance documentation or safety information, please contact the respective manufacturer directly. Quality control, production standards and product availability are the responsibility of the licensed manufacturing partner. Up

DII·ONE is a compact MIDI controller and routing hub designed for modern hybrid music setups.   It combines USB MIDI, hardware MIDI, and a CV clock output in a single device, allowing all functions to operate simultaneously without compromises. digital instrument interface one / usb midi interface and controller / 0 HP ⇣ DII·ONE is a compact MIDI controller and routing hub designed for modern hybrid music setups. It combines USB MIDI, hardware MIDI, and a CV clock output in a single device, allowing all functions to operate simultaneously without compromises. key features Compact USB MIDI controller with hardware MIDI I/O and CV clock output 4 programmable buttons (CC or Note, momentary or latching) 4 programmable knobs (assignable to any MIDI CC) USB MIDI to and from computer TRS MIDI In and Out (5-pin DIN compatible via adapter cable Type-A) CV Clock output for modular synthesizers (0–5 V) Hardware-based MIDI Learn Clock division directly from the device All functions usable at the same time → documents DII_ONE_QUICK_START_GUIDE.pdf ST_Modular_DII_ONE_Configurator_v6_2_1.zip description / manual The control surface of the DII·ONE MIDI controller is intentionally minimal and focused: Four freely programmable pushbuttons and four knobs provide direct access to the most important parameters without unnecessary complexity. Each button can be configured to send MIDI CC or Note messages and can operate in either momentary or latching mode, making them suitable for triggers, toggles, transport functions, or performance controls. The four knobs offer smooth and precise control over continuous parameters. Each knob can be assigned to any MIDI CC and adjusted in range, sensitivity, and response. This allows slow, detailed parameter changes as well as fast and expressive movements during live performance. Connection options are designed for maximum flexibility. Via USB, the DII·ONE provides bidirectional MIDI communication with a computer and is class-compliant, requiring no driver installation. It integrates seamlessly with all common DAWs and can be mapped instantly using MIDI Learn. In addition to USB MIDI, the DII·ONE features TRS MIDI In and Out for direct connection to hardware synthesizers. Using appropriate adapters, it is fully compatible with standard 5-pin DIN MIDI connections. This allows the controller to act as a bridge between computer-based setups and external hardware or even between to hardware synths. A dedicated CV Clock output converts incoming MIDI clock signals (from USB or TRS MID IN) into stable 0–5 V analog pulses, enabling modular synthesizers to stay perfectly synchronized with a DAW or hardware sequencer. Clock divisions can be selected directly on the device, offering a wide range of rhythmic relationships from straight timing to more complex divisions. MIDI routing can be adapted to different workflows using selectable MIDI Thru modes . The DII·ONE can operate as a pure controller, a MIDI interface, or a bidirectional routing hub. USB-to-TRS routing allows the computer to control external gear, while TRS-to-USB routing enables recording MIDI from hardware into a DAW. For advanced setups, bidirectional routing is available, allowing all connected systems to interact simultaneously. The integrated MIDI Learn function makes assigning controls fast and intuitive. After activating Learn mode, moving a control on the DII·ONE and sending a MIDI message from a DAW or synthesizer completes the assignment, which is then stored permanently in the device. Once configured, the DII·ONE operates fully standalone without requiring a computer. For deeper customization, the optional web-based configurator gives you complete control, from button behavior and knob response to MIDI routing, clock settings, filtering, and live MIDI monitoring. You can download the configurator HTML-file (*.zip) by clicking on the picture below. Typical Applications The DII·ONE is ideal for hands-on control of DAW parameters, MIDI control of hardware synthesizers, recording MIDI performances into a computer, and MIDI-sync hardware-synths and CV-sync modular systems via CV clock. Its ability to run all functions simultaneously and its compact format makes it especially suitable for hybrid studio and live performance environments. Technical Specification Push Buttons: 4 Knobs: 4 USB: USB MIDI (bus-powered) MIDI: TRS MIDI In / Out (Type A) CV Output: Clock, 0–5 V Clock Divisions: 1:1, /2, /3, /4, /5, /6, /8, /12, /16 MIDI Learn: Yes Web Configurator: Yes Standalone Operation: Yes (internal memory) Up

Utilities & PSU stereo total / mono to stereo converter, stereo width controller and imager / 4 HP ⇣ Mono: the original black and white movie. Stereo: the epic 3D blockbuster. Let's face it, mono might be the classic, but stereo is where the party's at! STOTAL_BACK.jpg 1/3 key features Mono to Stereo Converter Stereo Width Controller Stereo Imager Buffered Input Multiple Two Separate Stereo Processing Blocks Wrong polarity protection specs & downloads width: 4 HP depth: 25 mm power: 15 mA @ +12V / 10 mA @ -12V documentation videos description / manual STEREO TOTAL is a Mono to Stereo Converter, Stereo Width Controller and Imager. It consists of two building blocks. The first block A is a Stereo Simulator that creates a stereo signal from an incoming mono signal. This is done by splitting the mono signal in two separate signals, passing the left through an R-C network to reduce mid range frequencies and the right through an operational amplifier in differential mode to obtain an output as a difference to L. Knob A STEREO DEPTH controls the depth of stereo, but also places the signal within the stereo field. Because the signal is filtered, mid range frequencies will be changed as you turn the knob. Additionally the incoming mono signal is multiplied (buffered) and a lossless copy is available at the MONO OUTPUT jack in order to allow further mono signal processing. The second building block B is a Stereo Width Control that allows you to change a stereo signal from mono to wide stereo. This is achieved by summing both signals L and R to create a mono signal when knob B STEREO WIDTH is turned fully counter-clockwise and by splitting them via complete negative crosstalk, when the knob is turned fully clockwise. Fully clockwise the stereo signal contains no centre image at all. Initially the module was designed to be used with mono signals only, but you may also use both building blocks separately. You can convert a mono signal to stereo with block A while you can also change the stereo width of another stereo signal with block B. You can also independently convert two mono signals to stereo using both blocks at the same time (you need to patch a dummy cable to the right channel of stereo input B to disconnect both blocks). A mono signal to block A will run through both blocks when nothing is patched into the block B stereo input jacks. prev Up next

Modulation & Random lfot / touch control lfo / 3 HP ⇣ Low Frequency Oscillator featuring an extensive frequency range and a tactile touch control capability. 1/3 key features LFO with 3 Waveforms Sine, Square and Pulse waves LFO FREQUENCY potentiometer LFO RANGE switch Adjustable Pulse width Two touch plates to play the LFO HOLD function PUSH function Wrong polarity protection Skiff friendly specs & downloads width: 3 HP depth: 28 mm power: 49 mA @ +12V / 47 mA @ -12V documentation videos description / manual The LFO provides three voltages in shape of Sine, Square and Pulse waves. It can be used as a control voltage, clock source or patched into the audio path for drum synthesis. The frequency and the frequency range can be controlled by turning the frequency knob and rate switch. Additionally the width of the pulse wave may be manually adjusted. An LED indicates the current speed of the LFO. On the bottom of the panel you will find two touch plates. Using these you can “play” the LFO and become a part of the circuit. By pressing your finger onto the HOLD plate you will be able to stop and reset the LFO cycle. It will start over again when the finger is released. The second touch plate PUSH is altering the frequency of the oscillator. Roll your finger from the top side of the plate to the bottom and the rate will be increasingly speeded up. Or directly press you finger an all plate parts and go crazy! After releasing your finger from the PUSH plate the frequency will smoothly recover to its original speed set by the frequency knob. prev Up next

Oscillator drum / digital drum module / 3 HP ⇣ DRUM is an excerpt of the Mutable Instruments PEAKS module. It was reduced to the max and only focuses on the 808 and FM Drum algorithms. 1/3 key features Digital Drum Module Two Modes: 808 & FM Manual and CV Trigger HP friendly Flip Panel with Descriptions for each Mode Based on the MI Peaks Algorithms Wrong Polarity Protection specs & downloads width: 3 HP depth: 65 mm power: 60 mA @ +12V / 2 mA @ -12V documentation videos description / manual There are two modes to be selected via a push button on the PCB: 808 DrumThis is an emulation of the well-known 808 kick drum. You have manual control over the FREQUENCY, PITCH ENVELOPE, TRANSIENT and DECAY. FM DrumThis is a digital drum synth based on FM synthesis. By turning the knobs you can change the FREQUENCY, FM AMOUNT, DECAY and COLOR of the drum sound. DRUM has an internal EQ that allows you to adjust the amount of bass applied to the signal using a trimmer on the PCB. This module also has a flip panel with descriptions per mode on each side. Both modes share a manual TRIG button to execute the drum sound, a TRIGGER INPUT and a signal OUTPUT. Released under cc-by-sa-3.0 license: Pichenettes Mutable Instruments prev Up next

Oscillator pyxis / adaption of mutable instruments "plaits" / 8 HP ⇣ PYXIS condenses all of Plaits' functionalities into a more compact hp footprint, while further pushing the principle of "simplicity first" to unparalleled heights. 1/3 key features Please check out the original module by Émilie Gillet which is an all time Eurorack classic already Illuminated Pyxis Logo Wrong Polarity Protection specs & downloads width: 8 HP depth: 28 mm power: 50 mA @ +12V / 5 mA @ -12V documentation videos description / manual In order to easily tweak and change the sounds there are four main potentiometers that will change Timbre, Harmonics, Morph and Variant, which is any possible mixture of OUT and AUX. Freq has been put onto a small trimmer potentiometer to avoid any accidental change in pitch. On the bottom of the panel you will find all necessary jacks to control Pyxis via CV. Timbre, Morph and Freq have dedicated attenuverters to adjust the incoming CV signals. Yeah…but…where are the LEDs? Instead of always directly jumping to chord mode and watching the LEDs change, isn‘t it much better to listen and trust your ears to choose the right sound? Tweak the four potentiometers, change the program with the two buttons (Sound and Percussion Mode) and listen to the wide range of sounds Pyxis is able to generate. Let yourself be surprised what is hidden behind the programs you would usually not choose following the LED indicators. Released under cc-by-sa-3.0 license: Pichenettes Mutable Instruments prev Up next

Effects clipping cat / vactrol distortion with diode clipping & lpg / 4 HP ⇣ CLIPPING CAT will make your sounds meow! It's a Vactrol-based distortion that will easily cram a lot of filth and grit into your tone. From sine waves to kick drums, this cat won't miss a scratching post! 1/3 key features Vactrol Distortion Diode Clipping Soft & Hard Clipping „Diode Playground“ for Easy Replacement of Soft Clipping Diodes Vactrol LPG Skiff friendly Wrong polarity protection specs & downloads width: 4 HP depth: 30 mm power: 20 mA @ +12V / 20 mA @ -12V documentation videos description / manual Based on the passive and very simple WORKMATE CLIPPING CAT, this souped-up 3U module now features three main controls. GAIN determines the amount of distortion applied to your signal. LEVEL decreases the signal level that is fed into the circuit and the CAT/NO CAT switch activates or deactivates the additional diode clipping function. You can choose whether you want hard (CAT) or soft clipping (NO CAT). Depending on the diodes you solder in, the clipping behaviour and sound will change drastically. CLIPPING CAT will only blink and meow if you set the switch to "CAT" and have set a good amount of gain. The amount of gain can also be voltage controlled using the CV GAIN input socket. Each incoming CV signal can be attenuated with the corresponding potentiometer. The overall gain range can be adjusted using a trimmer on the back of the board. This CV functionality also allows CLIPPING CAT to be used as a low-pass gate with the smooth vactrol-based behaviour we all love. Another trimmer allows the circuit to be optimised for LPG or distortion purposes. To simplify the exchange of diodes for soft clipping mode, there is a "diode playground" on the back of the board where you can easily exchange through hole diodes . Feel free to experiment with different types of diodes and discover novel distortion sounds. Purr! prev Up next

Effects emoo / eurorack adapter module for MOOER guitar effect pedals / 8 HP ⇣ Emoo is an 8HP Eurorack Adapter Module for some of the MOOER guitar effect pedals. 1/3 key features Use most of your MOOER EFX pedals in your modular setup Easy plug and play without dealing with adapter cables Use your Eurorack power supply unit to power your little MOOER pedal Passive Volume Trimmer to limit high Eurorack signals on the back of the PCB Wrong polarity protection specs & downloads width: 8 HP depth: 30 mm power consumption depends on the pedal you choose (from 3mA to 160mA; Sky Verb approx. 130mA) documentation videos description / manual The PCB set consists of a little adapter PCB with a 12V to 9V voltage regulator and the IN and OUT jacks (3.5mm). Additionally there is a Panel PCB that fits most of the little MOOER effect pedals (those with the potentiometers and switches arranged as shown in the graphic on the left). You need to buy the original MOOER pedal in order to use this module in your eurorack setup. The adapter PCB may be used with any other guitar pedal requiring a 9V power supply. In this case you need to make the panel yourself. prev Up next