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Effects inaki / dual delay / 10 HP ⇣ Iñaki is a Dual Delay, Stereo Delay, CV Pan, CV Crossfade, 2 Channel Mixer and a Mono to Stereo Converter in a single module. 1/3 key features Dual/Stereo PT2399 Delay CV Pan CV Crossfade CV Attenuator 2 Channel Mixer Mono to Stereo Converter Delay Time and Feedback Wrong Polarity Protection specs & downloads width: 10 HP depth: 44 mm power: 65 mA @ +12V / 55 mA @ -12V documentation videos description / manual Each of the two channels has a PT2399 Delay with Time and Feedback. There is also an individual EQ available. The volume of the channels is adjustable with the two VOL potentiometers. The output of each channel is supplied on the L and R output jacks. These can be used for stereo signals. You may use CV Pan to change the volume of each side. Turning the CV Attenuator you sets the amount of PAN applied to both channels. Additionally there is a MIX out, where both sides are available at a single output jack. Using the Pan knob or the CV IN you can pan between both sides. If there is only one audio source connected to IN L this signal is multiplied to the other channel in order to provide a crossfade functionality. prev Up next

Utilities & PSU cv expert / dual polarizer, offset & gain with LFO / 4 HP ⇣ CV EXPERT is a very compact yet powerful CV tool that is equipped with all the important functions you need to customise your control voltages. With its internal LFO, it is immediately ready for use without further patching. 1/3 key features 2x Polarizer 2x Offset 2x Gain Triangle or Square Wave LFO Internal normalizations Low HP format Skiff friendly Wrong polarity protection specs & downloads width: 4 HP depth: 30 mm power: 50 mA @ +12V / 32 mA @ -12V documentation videos description / manual CV Expert (Cve) is a versatile dual-channel tool for customizing control voltages. Its internal LFO is normalised to both inputs and allows you to choose between a triangle or square wave via a jumper on the back. The LFO connection is automatically interrupted when an external CV is inserted. Adjust the LFO rate with the LFO RATE potentiometer. The signal received at the DC-coupled inputs IN ① and IN ② passes through three CV tools: Polarizer The PLRZR potentiometer enables voltage attenuation and inversion. At the midpoint, the signal is eliminated. Turning to the right allows the original voltage to pass through (as with an attenuator). Turning to the left inverts the signal, e.g. positive signals are converted into negative signals. Offset Adds or subtracts voltage from/to the passing signal. OFFSET control determines the offset range. In the center position, there is no voltage offset. Turning the control to the right shifts the voltage to the positive range, while turning it to the left shifts it to the negative range. Gain Amplifies the signal with a maximum gain of 2 at the GAIN control's maximum position, effectively doubling the applied voltage (e.g., +1V becomes +2V, +3V becomes +6V, or +4V becomes +8V). The voltage is capped at a maximum of +/-10V. CV EXPERT QUICK START GUIDE: CVE_QUICK_START .pdf Download PDF • 422KB prev Up next

Filter & EQ franz / analog multimode filter with lfo and cp3 mixer / 10 HP ⇣ Experience the ultimate sonic bliss with this filter featuring a smooth, buttery tone that wraps your sound in warmth. The integrated LFO adds rhythmic pulsations, while the CP3 mixer ensures seamless blending of your audio sources. 1/3 key features Analog OTA Filter 4 Filter Outputs: Low Pass, High Pass, Band Pass, Notch Internal LFO with two Waveforms: Triangle & Square LFO Reset,LED indicating LFO rate, LFO normalized to Filter ircuit Apply two LFO waveforms at the same time Attenuator for each LFO Wave or external CV 3-Channel Transistor based Mixer MIX out to use the Filter as a single Mixer Block Volume control for each Mixer Channel Wrong Polarity Protection specs & downloads width: 10 HP depth: 38 mm power: 83 mA @ +12V / 72 mA @ -12V documentation videos description / manual The filter is based on the CA3080 chip and offers four different outputs: Low Pass High Pass Band Pass Notch Tweak the dedicated knobs to finely tune the CUTOFF frequency and RESONANCE according to your preferences. This versatile module not only features a filter circuit but also houses a resettable LFO, offering both TRIANGLE and SQUARE waveforms. The LFO is internally linked to the Filter CUTOFF, modifiable using the CV1/TRI and SQU/CV2 knobs. These waveforms can be simultaneously utilized and reset via an external trigger. The automatic normalization of each LFO waveform disengages upon connecting an external CV source to the CV1 or CV2 input jacks. Adjust the LFO Rate using the designated potentiometer, with its speed indicated by a dual-colored LED. For waveform layering, a transistor-based 3-channel mixer is conveniently situated at the module's base. The mixer's sum directly feeds into the filter and is also routed to the MIX output jack. Precisely control input volumes per channel (VOL1-3) and collectively adjust them along with the filter INPUT potentiometer. prev Up next

Filter & EQ stereo eq / 3-band stereo EQ / 6 HP ⇣ Stereo EQ is a classic 3-Band EQ with Frequency Range Control over the Mid Band. 1/3 key features Stereo EQ 3-Bands Input Volume Control Mid Band Frequency Control Wrong Polarity Protection Skiff friendly Perfect Addition to your STEREO SUM Mixer specs & downloads width: 6 HP depth: 28 mm power: 15 mA @ +12V / 11 mA @ -12V documentation videos description / manual The HIGH band can boost or reduce the signal by +/-8db at around 5khz to 20khz. The MID band has a dedicated MID FREQ control that sets the frequency to be changed. It has a pretty narrow range that increases or decreases the signal by +/-5db from 500hz up until 2.2khz depending on the MID FREQ knob setting. The LOW band may change frequencies from 20hz to 300hz by +/-10db. The signal volume can be set with the INPUT potentiometer. STEREO EQ has a similar design as the STEREO SUM CHANNEL modules. If you want to have a more detailed EQ control over your mix STEREO EQ is a perfect addition to your STEREO SUM Mixer. prev Up next

Mixer & VCA fay v2 / fader, vca, overdrive, decay / 24 HP ⇣ FAY Combines four functional units in a tiny 4HP Module. It consists of a Fader, a VCA, an Overdrive and a Decay/Release Envelope. 1/3 key features Manual Fader/Mixer/Switch Voltage controlled amplifier Decay or Release Envelope Overdrive Functionality Volume Control LED indication Wrong polarity protection specs & downloads width: 4 HP depth: 28 mm power: 25 mA @ +12V / 10 mA @ -12V documentation videos description / manual If you insert two audio sources into the jacks IN A and IN B you may fade between both sources manually using the potentiometer on the bottom. This way you can either mix two waveforms or switch between them.The signal is directly routed to the VCA. Here you can control the volume or amplitude of the audio either manually or via control voltage using the CV jack. If there is a trigger signal at the TRIG input you will be able to control the VCA with the internal decay or release envelope (selectable via jumper). Simply insert a trigger signal into the TRIG jack and use the potentiometer below the LED to control the decay length. The LED indicates the current state of voltage. The envelope time can be set to 10ms or 3s via jumper. Thus is can be very snappy for percussion purposes. The decay or release envelope is also provided at the ENV OUT jack to control external modules via CV. Additionally there is an OVERDRIVE option that may be activated via switch. It is also affected by the CV input and shapes the sound to a certain extend. The OVERDRIVE is fairly subtle and more audible on short decay times. Nevertheless it really crunches up some simple waveforms. In contrast to the first version FAY Mk2 has an improved PCB layout and now only consists of one PCB to solder. prev Up next

The HUM PROTECTOR HP200 is probably the most compact stereo hum eliminator on the market. It reliably protects your audio signal from any noise and hum. hum protector hp200 / hum and noise eliminator / 0 HP ⇣ The HUM PROTECTOR HP200 is probably the most compact stereo hum eliminator on the market. It reliably protects your audio signal from any noise and hum. key features 1x Stereo or 2x Mono Compact Design No Power Required Easy to Solder documents "Finally I have no more USB noise in my setup!" "I have never had such a compact and good noise eliminator." videos description / manual Offering either two mono channels or one stereo channel, the device comes in two variants. The initial version incorporates a more economical and compact SMD audio transformer, whereas the alternative version integrates larger through-hole audio transformer with marginally superior specifications. Despite this distinction, both iterations are recognized for their commendable audio quality, exhibiting no discernible differences. From a technical standpoint, audio transformers serve to electrically isolate connected devices, effectively eliminating noise and hum in the audio signal path. The HP200 functions as a desktop unit, eliminating the need for valuable HP (horizontal pitch) in a Eurorack case. Its versatility extends to modular setups, as well as compatibility with grooveboxes, samplers, and other synthesizers, particularly those powered via USB. To eliminate hum or noise when connecting your synth to a mixer for example, just insert the HUM PROTECTOR between the devices by connecting the synth output to the HUM PROTECTOR input and the HUM PROTECTOR output to the mixer input. This should resolve the issue. You can also utilize it to eliminate noise from an audio interface by connecting it to the interface output and the monitor's input. Will there be a full size jack plug version? Probably not, as the product is designed for Eurorack and USB-controlled devices that typically use 3.5 mm jack plugs. In addition, there are already numerous versions with full-size jack sockets. Up

Sequencer shikensa / cv and trigger sequencer / 12 HP ⇣ SHIKENSA is a 5-stage CV and trigger sequencer with some nifty features. 1/3 key features 5-Step Analog Sequencer Outputs 3 CV and 1 Trigger Signal 3 Different Track Lengths Internal Clock with Swing and Tempo CV External Clock, Reset and Hold ADD Input for Sequence Transposition LEVEL Control via CV for LVL OUT Wrong Polarity Protection specs & downloads width: 12 HP depth: 28 mm power: 55 mA @ +12V / 41 mA @ -12V documentation videos description / manual Shikensa offers the flexibility of an internal clock set via the tempo potentiometer or synchronization to an external clock. Its internal clock enables swing effects through the CLK CV attenuator, allowing tempo adjustment using external CV signals at the CLK CV input. Additionally, CV control permits sequence reset or hold actions. It is possible to change the length of the sequence from a maximum of 5 steps to 4 or 3 steps using a toggle switch. There are five sliding potentiometers that allow fine changes in CV values per step. There is a trimmer on the back of the PCB to adjust the maximum voltage from +5V to +10V. SHIKENSA has a total of four outputs. OUT is the standard CV output that you would connect to a 1V/OCT input of an oscillator. If you apply a control voltage to the ADD input, you can transpose the output of OUT. IN/CK outputs either an inverted signal of OUT or the internal clock signal (this can be changed by swapping two resistors). LVL OUT carries the same signal as OUT, but its level can be changed via CV. An attenuator allows control over the amount of change. When nothing is connected to the LVL CV input and the attenuator is turned up, an internal pitch envelope is added to LVL OUT, which is great for creating percussive sound sequences. These three outputs can be used simultaneously to change not only the pitch of an oscillator, but also other parameters such as waveshapers, filters or effects according to the sequence. TRIG provides a trigger signal that can be activated or deactivated per step. Five latching push-buttons on the bottom allow you to create rhythmic patterns. An LED indicates whether a trigger signal is being output. SHIKENSA QUICK START GUIDE: SHIKENSA_QUICK_START .pdf Download PDF • 716KB prev Up next

Utilities & PSU pow! / usb power supply unit / 3 HP ⇣ POW ! is a 3HP USB Pow er Supply Unit for Eurorack. 1/3 key features USB PSU for Eurorack 300mA +12V 150mA -12V 500mA +5V from USB On/OFF Switch LED indication Skiff friendly specs & downloads width: 3 HP depth: 25 mm power: +5V USB-C Power documentation videos description / manual With this compact module, you can power your Eurorack modules from any +5V USB source. Simply connect a USB-C cable to the onboard jack. The module provides up to 300 mA at +12 V and 150 mA at −12 V via the 2×5 header on the underside of the PCB. Use a standard Eurorack power cable with 2×5 female connectors on both ends. A built-in switch lets you turn the power on and off. The status LED shows when the unit is active. Designed for small setups, this PSU is ideal for one or two modules in compact DIY cases. If you are interested in a PCB-only version, please take a look at POW! PCB: → mini power supply unit for eurorack modules / PCB only prev Up next

Utilities & PSU POW! PCB / mini power supply unit for eurorack modules / PCB only ⇣ POW! PCB is a compact power supply board for small Eurorack cases or testing setups. 1/2 key features USB PSU PCB for Eurorack max. 220mA +12V max. 200 mA -12V 500mA +5V from USB optional LED specs & downloads PCB only power: +5V USB-C or 9V DC Power documentation videos description / manual POW! PCB is a compact power supply for small Eurorack setups and testing environments. It can be powered either via USB-C (+5V) or a 9V DC input. The board generates stable ±12V rails and provides them through a standard 2x5 Eurorack power header. When powered via USB, +5V is also available on the header. Use a flying bus cable to connect more than one module. A status LED indicates when the board is active. The PCB is designed for low-power applications such as small cases or quick testing setups. It is well suited for bringing DIY modules into operation without the need for a full Eurorack power system. prev Up next

Modulation & Random envelope / cv envelope generator / 12 HP ⇣ ENVELOPE presents a classic ADSR/AR envelope generator elevated by advanced controls and shaping capabilities. Tailored for crafting diverse envelopes, it offers precise adjustments that result in dynamic control voltages, adding an organic and captivating dimension to your sounds. 1/3 key features ADSR/AR Envelope CV Control over all Stages Attenuator per CV Input Shape Control for Attack, Decay and Release Internal Envelope-Controlled Amplifier Loop Function Internal Modulation 0V to +10V Range specs & downloads width: 12 HP depth: 30 mm power: 56 mA @ +12V / 36 mA @ -12V documentation videos description / manual The length of each ADSR stage can be changed with four slider potentiometers. Times range from 1ms in FAST MODE to half a minute in SLOW MODE. The FAST MODE allows a very fine adjustment of short envelopes, which is especially handy for creating percussive sounds. There are dedicated SHAPE potentiometers for the ATTACK, DECAY and RELEASE stages. With these you can switch from exponential to logarithmic response curves. Each phase has its own CV input to control its timing. Dedicated attenuators allow you to adjust how much voltage is applied. The slider LEDs indicate if a voltage is being processed and if the timing of a stage is being changed. If nothing is patched to the CV inputs, the attenuators suppress the portion of each stage's voltage that is passed to the OUTPUT jack. This allows you to quickly change the envelope without changing the original slider settings. In addition, there is a CV input RF CV to control all rising and falling stages at once (without LED indication). ENVELOPE also has an internal GATE and MODULATION source. When the LOOP/RESET switch is set to LOOP, the envelope is internally triggered at a rate set by the MOD RATE pot. It also allows you to internally apply a TRIANGLE or SQUARE-WAVE LFO to any stage when nothing is patched to the CV inputs and the attenuators are turned clockwise. The rate of the LFO is also controllable with the MOD RATE pot. You can change the waveform of the LFO with the TRI/SQU switch. Setting the LOOP/RESET switch to RESET will reset the internal LFO each time a gate or trigger is received at the TRIG/GATE input. The TRIG/GATE switch determines whether a trigger or gate signal should be applied to the TRIG/GATE input. When you set the switch to TRIG, the envelope type changes to ATTACK and RELEASE only. If you need an envelope that is easy to change, this is the correct setting. GATE mode activates a full-featured ADSR envelope with many adjustment options. In addition to the standard envelope output ENV OUT, there is also an inverted output ENV INV. The voltage ranges of the ADSR outputs are about 0V to +10V for the normal output and 0V to -10V for the inverted output. To complete the packed feature list, ENVELOPE is also equipped with an internal VCA, which is internally connected to the envelope output. Simply connect an audio source to the VCA IN input and you'll have an envelope-controlled signal available at the VCA OUT jack. ENVELOPE QUICK START GUIDE: ENVELOPE_QUICK_START .pdf Download PDF • 710KB prev Up next

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 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 Alongside ST Modular, I also work under the name ST Interactive , where I create apps and music software for musicians, producers, and sound designers. The focus is on simple, inspiring creative tools for sound design, experimentation, and everyday music production. Up

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