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

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

Oscillator eurokastle / eurorack version of the bastl kastle / 10 HP ⇣ This is a Eurorack adaptation of the renowned Bastl Instruments Kastle – a digital synthesis playground. Embodying the full spectrum of Kastle 1.5 functionality, this version features subtle modifications to seamlessly integrate into the Eurorack format. KASTLE_BACK.jpg 1/3 key features Please check out the Bastl Desktop Synths for further details and consider buying one - it´s worth it! Use with Bastl Kastle or Drum Kastle Firmware Illuminated EuroKastle Logo Wrong Polarity Protection specs & downloads width: 10 HP depth: 28 mm power: 47 mA @ +12V documentation videos description / manual Switching between OSC mode and Rungler mode has been streamlined with a convenient switch, eliminating the need for intricate cable patching. Furthermore, each functionality is consolidated to a single input/output, simplifying your setup. Notably, our EuroKastle boasts a unique Waveshape CV attenuator absent in the original Kastle design. While we highly recommend Bastl's desktop version, the EuroKastle can stand independently. You can independently source all the required components, without necessarily needing the original. It's important to note that the PCB lacks an AVR ISP header. To program the Attiny85 ICs, a prior flashing process is essential before they find their place in the IC sockets (a breadboard can be utilized for this purpose). The programming process can be completed using any AVR ISP programmer. Powering the EuroKastle is a breeze with compatibility with standard Eurorack power supply units. Version V2 introduces AVR Headers to the PCB's bottom for direct ATTiny programming on the PCB itself. The diode pads have been thoughtfully enlarged for an enhanced soldering experience. Additionally, the CV Sources are normalized to the CV Input switches, facilitating instant modulation without the need for external patching. In Version V3, we've incorporated a jumper that allows you to transform the Mix OR OUT socket into a TRIGGER INPUT for the Drum Kastle firmware, enhancing your creative possibilities. For those seeking additional technical details and resources, we encourage you to explore the following links: Bastl Schematics Bastl Instruments Official Website prev Up next

ST CASE SMALL is a 20HP 3D printable Eurorack case designed to hold a small power supply (e.g. POW!) and an effects module to build a modular-compatible effects unit the size of a guitar pedal. Of course, you can also mount any other type of module that suits your needs. The internal depth of the cabinet is 35mm, the rails are inserted from the side. It is recommended to glue small rubber feet underneath to ensure a good stand. st case small / 3d-printable eurorack case / 20 HP ⇣ ST CASE SMALL is a 20HP 3D printable Eurorack case designed to hold a small power supply (e.g. POW!) and an effects module to build a modular-compatible effects unit the size of a guitar pedal. Of course, you can also mount any other type of module that suits your needs. The internal depth of the cabinet is 35mm, the rails are inserted from the side. It is recommended to glue small rubber feet underneath to ensure a good stand. There is a large hole at the bottom for easy access to the power cables and calibration trimmers or bridges. This makes this enclosure ideal for testing purposes. To have your ST CASE SMALL printed, you can download the STL-file below and contact your preferred 3D printing service. It is best to use PLA or PETG filaments. The average cost of printing the enclosure at an online print shop is around 15€ to 30€ (PLA; black; no finish). Local 3D printing services are often cheaper than those you find online. If you print the enclosure yourself on your own printer, it costs about 3€. The case shown on this page was printed with PLA on a Bambu Lab X1C. key features 3D-Printable Low-Cost Slide-in Rail Brackets Lightweight specs & downloads width: 20 HP depth: 55 mm power: no psu DOWNLOAD STL (ZIP) Up

1U Module ap / cv gate swap & switch / 14 HP ⇣ AP can be used to switch signals on and off or sw ap them between two destinations. 1/3 key features Swap & Switch CV Gate activates Switch Manual Switch LED Indication Available in Intellijel Format Skiff friendly specs & downloads width: 14 HP depth: 30 mm power: 19 mA @ +12V / 14 mA @ -12V documentation videos description / manual When a gate signal is ap plied to the GATE input IN B is connected to OUT A and IN A is connected to OUT B. When the gate signal is low, IN A goes to OUT A and IN B is connected to OUT B. You can also switch the signal manually using the latching switch in the middle of the module. If nothing is connected to IN A, +5V are provided at the active output socket. This way you can use AP as a manual gate or as an alternating gate trigger for two targets. prev Up next