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

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

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

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

Mixer & VCA spm / 3-channel spread mono mixer / 4 HP ⇣ SPM becomes particularly valuable as it enables the dispersion of two mono signals throughout the stereo field within an audio mix. This capability proves instrumental in tidying up the overall mix, resulting in a more expansive and enjoyable auditory experience for listeners. 1/3 key features Analog Mixer 3 Mono Channels Pan CH 1&2 with one Knob Skiff friendly Wrong polarity protection specs & downloads width: 4 HP depth: 30 mm power: 19 mA @ +12V / 11 mA @ -12V documentation videos description / manual SPM is a 3-Channel Mono Mixer with three volume potentiometers. The gain per channel can be adjusted with trimmers on the board, making this mixer suitable for line and Eurorack levels. In addition, you can pan channel 1 and 2 with the SPREAD potentiometer and thus spread both channels in the stereo field to the left and right in opposite directions. In the centre position, all channels are panned to the centre. If you turn the potentiometer to the left, channel 1 is panned to the left and channel 2 to the right and vice versa. This is very useful to quickly clean up a mix and widen the sound spectrum in the stereo field. prev Up next

Oscillator alstaden / analog waveshaping oscillator / 16 HP ⇣ ALSTADEN is your source for harsh and harmonically rich sounds. It is a newly developed waveshaping tone generator and resembles the secondary oscillator of the semi-modular synthesizer „EUPHORIA“. 1/3 key features Analog Oscillator with 5 Waveforms CV Waveshaper and VCA EQ and External Inputs Level-Potentiometers Linear and Exponential FM specs & downloads width: 16 HP depth: 30 mm power: 75 mA @ +12V / 65 mA @ -12V documentation videos description / manual The waves are formed by a combination of diode clipping and folding of the waveform by adding mirror images of the upper and lower parts of the waveform. This creates more high harmonics and interesting timbral variations. It also features an equalizer, which is quite unusual for oscillators, but offers more sonic possibilities. The oscillator module offers five different waveforms WAVE A, WAVE B, PULSE, SUB and SINE. The level of the individual waveforms can be adjusted with sliding potentiometers. The range of the levels depends mainly on the gain you set during calibration. Distortion can easily occur in the upper positions of the sliders if you have set the gain high. The pulse width of the PULSE waveform can be changed manually with the PULSE PWM knob. There is also a CV input CV PWM with its own attenuator to control the pulse width via CV. At the heart of this oscillator are the two waveshapers WAVE A and WAVE B. Harmonics are added by wavefolding and can be changed by turning the SHAPE A and SHAPE B knobs. Additionally there is a CV input CV SHAPE A1 and CV SHAPE B1 with an attenuator each for voltage controlled wave folding. WAVE B has a second CV input without attenuator that allows even more control over the wavefolding state. The SUBOCTAVE has two stages of -1 and -2 octaves. Select your preferred division with the help of the SUB -1 and SUB -2 on/off switches. Unexpectedly, you can equalize the output of the oscillator with the TONE control. It accentuates either low or high frequencies of all waveforms before they are fed to a internal VCA. The INTERNAL VCA can be controlled via the ENV IN socket. Patch any CV here to change the level of the main output. Additionally, there is also a FM input. You can apply exponential or linear FM by feeding any (preferably high frequency) voltage into the FM input. Select an FM type with the EXP/LIN switch. If you set the switch to the middle position, no FM will be applied. V/OCT is the input for the application of a pitch CV. The pitch can be controlled manually with the PITCH and FINE potentiometers. EXT IN A and EXT IN B are audio inputs that allow you to use the oscillator as a waveshaper for external signals. When a jack is connected to these inputs, the corresponding internal waveform is switched off. The external signals will also be routed through the level potentiometers, EQ and VCA. Further details can also be found in the ALSTADEN QUICK START GUIDE: ALSTADEN_QUICK_START .pdf Download PDF • 1.70MB prev Up next

1U Module slide / 2 channel mixer/fader / 12 HP ⇣ SLIDE is a very simple but powerful 2 channel mixer with just one slide potentiometer. 1/4 key features 2 Channel Mixer 2 Inputs, 1 Output Slide Potentiometer Potentiometer LED indicating Voltage State Available in Intellijel and Pulp Logic Tile Format Convertable Flip Panel Skiff friendly specs & downloads width: 12 HP depth: 25 mm power: 20 mA @ +12V / 15 mA @ -12V documentation videos description / manual With two input jacks and one output jack in the middle you can mix or fade any audio or cv singnal with the slide potentiometer. This module is available in the Intellijel 1U format as well as in the Pulp Logic 1U Tile format. Additionally the panel is convertable in order to flip it upside down, if you want to have the jacks at the bottom of the module. prev Up next

Effects gritzner / pt2399 delay with two switchable inputs and internal lfo / 8 HP ⇣ GRITZNER Delay is a special kind of module that is able to make all sorts of weird delay sounds, from chorus like effects to total destruction of the original signal. There are no boundaries for your crazyness here. Though the two switchable inputs and the LFO reset always make its output fit into a rythmical pattern of your patch. 1/3 key features PT2399 Delay Two Switchable Inputs, one High-Pass-Filtered Internal LFO for Input Switching Internal LFO for Delay Time Changes LFO with Attenuator and Reset Delay Time CV Input Skiff friendly Wrong polarity protection specs & downloads width: 8 HP depth: 28 mm power: 50 mA @ +12V / 30 mA @ -12V documentation videos description / manual GRITZNER is a short delay with two individual inputs that may be activated alternativley either by hand or with a gate signal. IN A is a standard audio input whereas IN B is a high pass filtered input. Frequencies below 320hz will be filtered out which is quite handy for some delay settings. If the MAN/LFO switch is on the left you can switch between both inputs manually using the A/B MAN switch. If the MAN/LFO switch is in the right position an internal square wave LFO automatically switches between both inputs according to the LFO range set with the help of the LFO potentiometer. Alternatively you may patch an external gate signal (from a sequencer for example) into GATE A/B in order to switch between inputs. The Delay itself is a classic PT2399 delay with its very special touch and a delay time ranging from 30-190mS. It has manual controls for the Delay Rate (going beyond the ICs operation range), Feedback and Wet. The delay rate can be voltage controlled with an external signal or with the help of an internal LFO. You can choose between a triangle and a square wave LFO and you may attenuate its signal with the LFO ATT attenuator. On top the LFO is resettable via the LFO RST input in order to get delay changes in a rythmical manner. The LFO rate can be adjusted with the LFO potentiometer. prev Up next

Modulation & Random cion / cv function generator / 6 HP ⇣ CION embodies versatility, functioning as a CV AD or ASD envelope, basic filter, slew limiter, and even a voltage-controlled oscillator with variable waveshapes. 1/3 key features Attack & Decay Envelope Attack & Decay CV (also both simultaneously) Shape Control CV Processing via Input Socket Trigger Input Cycle Functionality with CV Control EOC Output LEDs indicate Activity on all Outputs Wrong Polarity Protection Skiff friendly specs & downloads width: 6 HP depth: 28 mm power: 45 mA @ +12V / 31 mA @ -12V documentation videos description / manual The function generator offers an ATTACK and a DECAY potentiometer, which represent the attack and decay times, the positive or negative slew time or the rising and falling edges of an oscillation, depending on the application. There is a CV input for ATTACK and DECAY. The rise and fall times are individually voltage controllable, but they can also be controlled together via the AD input. A shape knob lets you change the CV curve from exponential to logarithmic. The time range per cycle can be as fast as 3ms and last for up to 20 minutes depending on the position of the RANGE switch. The TRIG socket is used to start the envelope via CV. This can also be done by the press of a push-button. Connect any signal (CV or audio). to be processed to the INPUT jack. Insert a gate signal to add a sustain stage to the AD envelope. If no external signal is available to trigger the envelope, the function generator can be set to loop mode by the CYCLE switch. When the switch is active, the envelope starts again from the beginning as soon as it reaches the end of a cycle. The CYCLE CV input activates or deactivates the cycle functionality depending on the switch position. An End-Of-Cycle signal is available at the EOC socket. CION QUICK START GUIDE: CION_QUICK_START .pdf Download PDF • 574KB prev Up next