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 before you begin... Building ST Modular designs is a rewarding challenge, but it requires a specific level of technical proficiency. Please read the following guidelines carefully before starting your build. Required Skills & Assembly Experience Level: These projects are recommended for experienced builders only. Technical Skill: You should be comfortable soldering 0603 surface-mount (SMD) components before attempting these builds. Responsibility: You are solely responsible for the successful assembly, safe power integration, and necessary calibration of your module. Sourcing & Support Missing parts: If you have purchased a 'Full DIY Kit' and find that parts are missing, please contact the manufacturer directly. ST Modular does not manufacture or sell its own designs; the manufacturers manage their own inventory and replacements. No Repair Services: ST Modular operates exclusively as a designer and licensor. I do not offer repair services. Where to Buy: Please note that PCBs, kits, or pre-assembled modules are not sold directly through st-modular.de. Safety & Liability Equipment Safety: You are responsible for ensuring your finished module does not damage your power supply, case, or any other connected equipment. Personal Safety: ST Modular is not liable for any injuries to yourself or others, or damage to property, occurring during the assembly or operation of these designs. Assistance If you run into trouble, the community is your best resource! Use the forum. For questions, please post in the official forum instead of sending emails. Response Time: You will receive a much faster response from the community on the forum than via Email or Instagram DM. 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

Modulation & Random envoltura / dual analog envelope / 14 HP ⇣ Experience the classic charm of analog envelopes based on the Roland System 100M 140 Dual ADSR module, made snappier with intuitive visual controls. Furthermore, thanks to its built-in VCA, manual level controls, potent cyclical gate generator, and user-friendly trigger buttons, ENVOLTURA elevates your sound-sculpting prowess to new heights. And when you double it up, prepare for twice the thrill! 1/3 key features Based on System 100M 140 Module Dual ADSR CV Level Control Inverted Output Retrigger Input Push Inputs Short and Fast Switch Manual Trigger Buttons Cycle Functionality Skiff friendly Wrong polarity protection specs & downloads width: 14 HP depth: 30 mm power: 89 mA @ +12V / 56 mA @ -12V documentation videos description / manual ENVOLTURA boasts a highly responsive analog envelope with controls for ATTACK, DECAY, SUSTAIN, and RELEASE. When a gate signal is applied to the GATE input, the envelope is triggered, and a corresponding CV signal is produced at the OUT, with an inverted version available at the INV output. Furthermore, an end-of-cycle GATE signal can be accessed from the EOC socket, which outputs a gate signal when the sustain phase of the envelope ends. The signal remains high until the start of the next attack phase. The gate is indicated by an LED. You have also the flexibility to retrigger the DECAY phase of the envelope by applying a trigger signal to the RTRG input. IN addition to manual level adjustment via the slider level potentiometer, you can modulate the envelope's level using an internal VCA by patching a CV signal to the VEL input socket. An exclusive attenuator enables precise control over the level modulation. For dynamic modulation, simply patch any CV source to the PUSH inputs and manipulate both the envelope's length and level. Fine-tune the overall length range with the SLOW/FAST switches, and if desired, activate the CYC switch to let the envelopes cycle within specific ranges. Please note that cycling may stop for very fast cycles and that the envelope doesn´t restart from 0 volts. Finally, you can also trigger each envelope manually. Please note that both ADSRs are normalised to each other, so that pressing a button always triggers both envelopes, unless a patch cable is connected to the gate input of the other. ENVOLTURA QUICK START GUIDE: ENVOLTURA_QUICK_START .pdf Download PDF • 775KB prev Up next

Utilities & PSU switched / switched mute multiple / 4 HP ⇣ When those arrows point the way, the two "Combine" switches unite three channels from one side of the multiple with the other side in a flash. Just make sure the single channel switches on the receiving side are looking the other way across the panel. Catching on? 1/3 key features 2x4 passive Multiple 1x8 passive Multiple 2x In or Out jacks 8 switches to route signals One multiple side can be assigned to the other at once 3U Eurorack module, 4 HP wide specs & downloads width: 4 HP depth: 28 mm power: No power consumption documentation videos description / manual SWITCHED is a 4HP passive 2x3 switched multiple module for Eurorack. Both sides can be combined to have a 1 to 7 multiple, each numeric channel may be muted or switched to the other multiple side. The two "Combine" switches indicated by an arrow connect three channels of one multiple side to the other side at once, if the single channel switches of the receiving multiple side are pointing to the opposite edge of the panel. 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

Filter & EQ dirty dan / 3-channel vactrol-based analog filter and distortion / 10 HP ⇣ Meet Dirty Dan, the eurorack rebel who doesn't play by the rules of clean and tidy. Dan's all about embracing the mess, dishing out gritty goodness, and making those pristine waveforms second-guess their existence. If your sound needs a touch of snotty charm, Dan's your man. Just remember, he's not just dirty – he's delightfully disruptive! DIRTY_BACK.jpg 1/3 key features Vactrol-Based Analog Filter Three Channels Separate Distortion Stage High Pass and Low Pass Cutoff controls High Pass and Low Pass Two Clipping Modes Feedback Control Skiff Friendly Wrong Polarity Protection specs & downloads width: 10 HP depth: 32 mm power: 58 mA @ +12V / 54 mA @ -12V documentation videos description / manual The module has three input jacks. The first two inputs are directly connected to the vactrol filter. The third input first goes through an additional diode-distortion circuitry and is then connected to the vactrol filter. Each input jack has a dedicated volume control potentiometer. Hence you may use Dirty Dan also as a Dirty Mixer. The amount of distortion for channel IN 3 can be set with the DIST potentiometer. Additionally soft and hard clipping may be activated with the switches DIST SOFT and DIST HARD. It´s best to use a sine wave to hear the differences between the clipping modes. The distorted signal can be taken from the DIST OUT jack separately and is then being disconnected from the vactrol filer and the other two inputs respectively the OUT jack. This allows you to process the distorted audio with external modules. The filter itself is vactrol-based and has it´s own nature. The sound varies depending on the vactrols being used. It´s fine to solder retail vactrols like the VTL5C series, but the fun starts when DIY vactrols are being used. The sound from the inputs will go through a high pass filter, that can be set with the HIGH PASS potentiometer. Also a low-pass filter will take effect. This can be controlled with the CUTOFF pot. This pot is not called low-pass as you might expect, because the HIGH PASS settings directly influence the CUTOFF pot. If the HIGH PASS knob is fully counter-clockwise, CUTOFF acts as a classic low-pass filter knob. If you turn HIGH PASS clockwise the CUTOFF knob will also act as a high-pass filter in some knob settings turning it further than 12 o´clock. This way you can blend between low-pass and high-pass with one knob, the CUTOFF knob. Either low-pass or high-pass may be CV controlled. A third CV input controls both at the same time. The level of control voltage for CV H/L may be varied with the CV H/L attenuator potentiometer. The FDBK potentiometer sets the amount of audio being fed back into the filter circuitry providing a nice resonance to the signal. The range of feedback amount can be set with a trimmer on the back of the PCB. prev Up next

Oscillator trommelmaschine / three-voice hybrid drum synthesizer / 18 HP ⇣ TROMMELMASCHINE is the German name for "drum machine", and it perfectly sums up the essence of such a machine: a versatile three-voice digital and analog drum module that can be used to create a range of kick drums and various percussion sounds. 1/3 key features 3 Voice Drum Generator Digital & Analog Drum Synth plus Noise Two Digital Drum Modes CV Inputs with Attenuators Internal Mixer Individual Outputs Wrong Polarity Protection Firmware based on MI Peaks: Released under cc-by-sa-3.0 License specs & downloads width: 18 HP depth: 28 mm power: 165 mA @ +12V / 72 mA @ -12V documentation videos description / manual This drum module features a DIGITAL DRUM VOICE (D) with PITCH and TONE control that has three modes (with latest firmware V2): KICK, SNARE and PERC. Press and hold the MODE switch for one second to switch between the KICK and PERC modes. When in KICK mode, press the button briefly to switch to SNARE mode. In KICK mode the sliders are MOD1 = DECAY, MOD2 = TRANSIENT, MOD3 = PITCH ENV and in PERC mode MOD1 = COLOR, MOD2 = DECAY and MOD3 = FM AMT. In SNARE mode the sliders are MOD1 = DECAY, MOD2 = SNAPPYNESS, MOD3 = TONE. PITCH and MOD can be changed manually or via CV with dedicated attenuators. If nothing is connected to the CV inputs, the MOD CV attenuators change the response curve of the MOD sliders. Turn them to the right to get a linear response and to the left to get a logarithmic response. This facilitates precise adjustment of the slider positions. The ANALOG DRUM (A) voice has DECAY, DRIVE and PENV (pitch envelope) sliders, plus PITCH and LENGTH (pitch envelope length) potentiometers. These can also be controlled via CV. The PITCH CV input tracks 1V/OCT and can be used to play notes. The EMPH input lets you emphasize the signal. This jack can be used as an input to control the internal VCA, e.g. to feed it with an ADSR. The third voice is a NOISE GENERATOR (N) with COLOR control and DECAY slider. The decay of the noise can also be controlled via CV. All voices have individual trigger inputs (D. TRIG is normalized to the other trigger inputs) and individual outputs and are also summed using an internal mixer at the MAIN output. The volume of each channel can be changed with the volume pots. Loudness LEDs indicate when a voice is close to clipping. TROMMELMASCHINE QUICK START GUIDE: TROMMELMASCHINE_QUICK_START .pdf Download PDF • 984KB prev Up next

Sequencer chasing lights / analog rhythm sequencer / 22 HP ⇣ Discover the comprehensive capabilities of chasing lights, a fully-featured analog trigger sequencer boasting 3 channels and 8 trigger steps per channel, channel chain and a clock divider. 1/3 key features 3x8 Steps Analog Sequencer 8 Trigger or Clock Outputs Clock Divider Channel Chaining Sum Output and B/C Swap Wrong Polarity Protection specs & downloads width: 22 HP depth: 28 mm power: 75 mA @ +12V / 48 mA @ -12V documentation videos description / manual CHASING LIGHTS is a 3-channel analog trigger sequencer with a total of 8 trigger or clock outputs. Each channel has 8 trigger steps that can be activated or inactivated with a push-button per step. LEDs indicate if a step is active and which step is currently playing in a sequence. The trigger signals are available at the output sockets A, B and C. Each sequence can be clocked at its own external clock rate. The A CLOCK input is normalized to the other clock inputs and also to the CLK THRU output to sync CHASING LIGHTS to other sequencers. In addition one CV RESET function is available per channel. The RST ALL button can be used to manually reset all sequences to the first step. It can also act as a HOLD function as long as the button is pressed or the CV input is high. This is especially useful if you want to change the sequence lengths spontaneously. The A/B/C LENGTH switches can be used to set three different lengths per channel. 2/3 and 8 for channel A, 5/6 and 8 for channel B and 5/7 and 8 for channel C. All channels are summed at the SUM output. Each channel can be enabled or disabled for summing using the A/B/C SUM switches. Outputs B and C can be swapped with the SWAP B/C button to create rhythm variations. Wait! No mutes? To have less HP and a better practical experience, the channels should be muted using external modules with on/off switches (such as the vactrol mute ONCE IN A WHILE) or mixers (like PHOEBE, SUM2 or STEREO SUM). The A CLOCK input is also routed to a clock divider. Three divider outputs provide six different clock divisions and can be switched off in the centre position of the corresponding switches. With CLK VARI the counting direction of the internal divider can be changed by CV. This can be used to create interesting clock changes. Channel CHAIN is one of the most interesting functions of CHASING LIGHTS. It is possible to chain all three channels one after the other to create sequences up to a length of 24 steps. There is also an external input CHAIN EXT that can be included in the chain creating even longer sequences. You can set the chain length from 2 to 4 steps, with 2 chaining only channel A and B and 4 steps chaining all channels plus the external input. You can control the speed at which the channels are chained one after the other manually or by CV. It is also possible to reset the chaining sequence to channel A by pressing the CHAIN RESET button or using control voltages. CHASING LIGHTS QUICK START GUIDE: CHASING_LIGHTS_QUICK_START .pdf Download PDF • 1.66MB 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

Utilities & PSU cause & effect / voltage reader, sample & hold and gate switch / 4 HP & 20 HP ⇣ Introducing the Cause & Effect module – the maestro of musical mischief in your Eurorack setup. It's like the conductor of a whimsical symphony, where flipping switches and twiddling knobs creates a chain reaction that turns chaos into pure sonic magic. Who knew that cause and effect could be this much fun? 1/6 key features Three Utility Tools Voltage Reader for Gates Hold for Sampled Voltages Gate Switch Gate Switch Inverter Two Hold Modes Inputs Normalised Accepted input voltages for all inputs: -8V to +8V (CV & Audio). Available in Intellijel and Pulp Logic Tile Format Skiff friendly specs & downloads width: 4 HP & 20 HP depth: 30 mm power: 35 mA @ +12V / 31 mA @ -12V documentation videos description / manual The first unit is a VOLTAGE READER, that outputs a gate signal according to a limit set with the help of the READ LIMIT potentiometer. If the limit set (any voltage between -6V and +6V) is reached by the incoming voltage, the R GATE output will be high. The limit may also be controlled via external control voltage at the LIMIT CV jack. This so-called comparator outputs a gate with an amplitude of +/-5V, which also makes it usable as a square wave generator with pulse with modulation via the READ LIMIT potentiometer. Any voltage applied to READ IN is normalised to HOLD IN and IN A. R GATE is normalised to H GATE and SW GATE. This way only one signal is necessary to control both other units. The second unit is called HOLD. In one mode it can sample and store a voltage from the HOLD IN jack and supply it at the HOLD OUT jack, if gate at H GATE is high. In another mode it can pass through the incoming voltage when gate is high. It then samples and stores the last voltage value applied when gate switches to low. The modes are selectable via the HOLD MODE switch. The third unit is a GATE SWITCH. Apply a gate signal to the SW GATE input to route IN A or IN B to OUT. If the gate signal is high, IN A is switched through, and if the gate signal is low, IN B is switched through. When only IN A is connected and IN B is not, OUT produces an inverted version of IN A when the gate is low, and a non-inverted version when high. When only IN B is connected and IN A patched with a dummy cable (a cable that is not connected to another module), IN B can be switched off by a gate signal. If nothing is patched to IN A, the VOLTAGE READER GATE output is normalized to this input. This module is available in 3U and 1U! CAUSE & EFFECT QUICK START GUIDE : CAUSE_EFFECT_QUICK_START .pdf Download PDF • 452KB prev Up next

Filter & EQ karl / multi-mode stereo filter / 8 HP ⇣ Karl is an analog multi-mode filter that is loosely based on the KORG MS-10 and MS-20 filters, but has been improved to handle two mono or one stereo audio source. The Resonance can still be varied independently per channel, which is very interesting when using two different audio sources at once. If you want to merge the two audio sources there is a Mix Out next to the two independent outputs per channel. 1/3 key features Analog Dual/Stereo-Filter 4 Filter Modes: LP, HP, Phaser and Overdrive Independent Resonance Control Mix two Mono Signals Mono to Stereo Converter CV Control over Cutoff Frequency CV Attenuator Expander Module Wrong Polarity Protection specs & downloads width: 8 HP depth: 28 mm power: 56 mA @ +12V / 45 mA @ -12V documentation videos description / manual Karl has four modes: Low Pass Mode: Classic Analog Low Pass Filter High Pass Mode: Classic Analog High Pass Filter Phaser Mode: A small band of frequencies is filtered next to the original signal being passed through Overdrive Mode: If Resonance is increased the filter will quickly jump to overdrive, which creates some nice Harmonics The Modes may be changed via jumpers on the back of the module. In any mode the Cutoff Frequency may be changed via CV. The CV signal can be attenuated with the CV potentiometer. There is also an expander module available. The „Karl Mode Selector“ gives you front panel control over the modes and an alternative audio input for the right channel that can be activated via switch. prev Up next

We greatly value all the feedback we receive. Nevertheless, we prefer to maintain communication within the forum to ensure that all information remains accessible to the community. SAY HELLO! We greatly value all the feedback we receive. Nevertheless, we prefer to maintain communication within the forum to ensure that all information remains accessible to the community. forum First Name Last Name Email Your message Thanks for reaching out! Senden

Mixer & VCA μ sum / moog cp3 based 3-channel analog mixer with eq & mute switches / 8 HP ⇣ μSUM is the successor of KNEAD and has an improved circuitry and PCB layout. It was inspired by the famous MOOG CP3-Type Mixer. The circuit adds some nice harmonic distortion to the signal with heavy clipping, if the inputs are turned to the maximum. As the mix is bussed passively turning one input up may result in a reduction of the other inputs. Therefore the output cannot exceed any other input´s level providing auto-leveling on high volumes. 1/3 key features CP3 Transistor-Based Analog Mixer 3 Audio Channels 3x EQ 3x Mute Switch 3x Signal LEDs MIX Volume Skiff friendly Wrong polarity protection specs & downloads width: 8 HP depth: 30 mm power: 56 mA @ +12V / 45 mA @ -12V documentation videos description / manual There are three potentiometers to adjust the LEVEL for each signal. Additionally you may change the frequencies of each channel by turning the EQ knobs. EQ will boost high frequencies turning the knob clockwise and boost low frequencies turning it counter-clockwise. On top you will find MUTE switches for easy sound comparison or live mixing. LEDs will indicate if a signal is passed through. The LED´s brightness can be set with trim potentiometers for each channel. The MIX VOL knob controls the volume of the summed signal being supplied at the OUT Jack. Knead Expander has been omitted on the μSUM Mixer. prev Up next