The MS-22 is a dual voltage controlled filter, inspired by the classic Korg MS-20 filter, with an innovative modulation matrix and one of the highest function-to-hp ratios in the land of Eurorack. This module was inspired by many pleasant chats with tech journalist Steve O’Hear. Head over here for a full product description and demos.

What makes the MS-22 unique
The MS-22 contains two dedicated filter circuits, one low-pass and the other a high-pass. These are configured in series, the low-pass going into the high-pass. This configuration allows for a unique duophonic fighting resonance behaviour (see this demo video). The cutoff frequencies of both filters can be CV’ed. Compared to most bread-and-butter MS-20 clones, the MS-22 is twice the amount of filter condensed down into half the package (4HP).

Furthermore, the MS-22 also possesses the following selling points

• The MS-22 offers CV control over input gain, basically this allows you to either CV the level of filter overdrive or use it as A VCA for signal going into the filter

• The MS-22 offers CV control over resonance, the MS-22’s resonance can also be pushed way further compared to Korg’s MS-20

• The MS-22 has a link switch, which links the cutoff frequencies of the low-pass and high-pass filters in two different ratios. This creates two flavours of band-pass filters, of which the bandwidth can be tweaked and CV’ed. The switch itself also serves as an awesome performance effect as you can use it to create an instant drop. I demonstrate this near the end of this video.

• The MS-22 has a unique modulation matrix that allows to configure many internal patches without using cables. The modulation matrix is designed to encourage happy accidents!

This is a Do-It-Yourself kit, not an assembled module. Building instructions can be found here. All SMT components come pre-soldered, only bigger parts and THT to solder.

DIY level: medium

As someone who is developing Eurorack modules, I always found it tedious to visualize signals coming from the modular synth on my oscilloscope. The reason for this is that there’s really no convenient adapters for this (well, as far as I know at least). Most workarounds to this problem suffer from two problems: a) They’re usually mechanically unstable, and b) most of the times I would need to redistribute the visualized signal to somewhere else, which requires extra cables and a mult. To alleviate these issues I’ve created the the THREETOM Wiretap, a 2-way mult that you can directly mount onto a BNC connector.

This is a fully assembled Wiretap adapter, no assembly required, just plug and play!

Soundwich is a device based on the sound of tact switches, hardware and PCB material. In part it’s a compact and sturdy form factor for interaction with piezo experimentation. The piezo disks are directly mounted to the undersides of the top and bottom PCBs creating a direct connection to the sounds of the tact switches. The two 3.5mm jacks can be used as either ins or outs. One is a momentary out and one is always on. The momentary output allows you to hear only the depressed click sound of the tact switches while the always on output allows you to hear both the depress and release of the tact switches amplified by the two piezos. When you shake the Soundwich you will hear the sound of six washers sliding along machine screws and colliding against the two piezo pickups. Using momentary out while shaking will only allow that sound to escape when disks are compressed. Compressing along the edges will provide different filtering amounts depending on where you press [the 7 stacked lines indicate greatest amount of filtering/attenuation with less and less filtering as your travel counterclockwise till there is nearly zero].  Routing audio or CV through provides a fast and tactile handheld momentary on device.

Check this video or that. For more description, check the Landscape website.

This is a Do-It-Yourself kit, not an assembled module. Building instructions can be found here. It's easy but you have to solder SMT components!

DIY level: medium

This is the module that every modular synthesizer enthusiast has been waiting for. A VCO that can tune itself. Imagine Cher, but there’s a switch to control her reference pitch… That’s exactly what this module does for you. >Video<

This is a full kit for the Duskwork Self-Tuning VCO, including all parts that you need to build it. The PCB comes pre-populated with all SMT components, apart from the AS3340-SOIC16 which you would need to install along with all through hole components, and then program the Atmega328 by using the 6 pin ISP header with a provided .hex file. You can find a bill of materials, and build instructions in the build guide located below. You’ll also need to upload the .hex file below too.

Features:
• Analogue VCO
• 3-Wave mixer
• Self-Tuning Capability
• Powered by the iconic 3340 VCO IC
• Simple Controls
• Tuning Status LED

Power: ?mA @+12V, ?mA @-12V
Width: 6 HP
Depth: 26mm

This is a Do-It-Yourself kit, not an assembled module. Building instructions can be found here. Almost all SMT components are pre-polulated, you mainly have to solder through-hole parts.

DIY level: easy

The 16n AtoVproject Rework is aimed a solving a problem very specific to modular synthesis. As a patch is getting more and more complex a forest of cables has grown over your system before you know it. This module allows you to take the control from the modular into a very ergonomic controller that integrates perfectly into a modern studio.

The 16n AtoVproject Rework is a controller sending CV, I2C, MIDI jack, USB MIDI (compatible PC, Mac, iPad etc...), making it the absolute ultimate controller for any of your hardware and software all in one!

Even better this controller can either can either be used as a Eurorack module or as a standalone unit using the beautiful aluminum enclosure. In 2019, the Berlin Modular community showed interest into building the 16n Faderbank. As one of the Berlin Modular community organizers, I decided to make a redesign of the 16n faderbank following the suggestions and desires of our members. The 16n AtoVproject Rework is the result.

This unit features :

• 16 high high end Alps faders

• Eurorack compatible and standalone enclosure (for use in or out of the rack)

• Selectable 0-5V or 0-10V CV output range (independent setting for each faders)

• High stability power conditioning for high stability analog inputs.

• Addition of utility connector on the back of the unit to simplify the use of i2c with modules like the ER301

This version of the 16n Faderbank ships with:

• AtoVproject 16n Rework Eurorack module

• Enclosure for standalone use (Alumunium Powder coated)

• USB cable (High quality 1,5m braided and shielded)

• MIDI din to Jack adapter (90° angled, Type A)

• Eurorack Power Cable

The 16n AtoVproject rework is a complete redesign of the original open source (CC-BY-SA) project 16n faderbank. This project was originated by Brian Crabtree, Sean Hellfritsch, Tom Armitage, Brendon Cassidy. As wished by the original designers the 16n AtoVproject rework is also open source and uses the same CC-BY-SA licence.

This is a Do-It-Yourself kit, not an assembled module. Building instructions can be found here.

DIY level: medium

The AtoVproject Gaeto is a new type of clocked logic module. Gaeto is a great module to play around with triggers, gates and legatoes turning one into the other. As a result we decided to name the module Gaeto from “Gate” and “Legato”.

Some of the functions that the module can perform are:

• /2 /3 Clock divider

• legato generator

• trigger to gate converter

• time quantizer

• sub octave generator with PWM

• generative trigger sequence

The Gaeto’s function is to perform the following operation:

“If the signal on the data input has been high, then the output is high at the next clock. If not - the non-output is high.” In other words, if the signal on the input signal goes over 1V then the memory stores a 1 if not it stores a 0. At the next clock the output will be high if a 1 was stored and the non output will be high if a 0 was stored. The output is coupled with an AND gate that allows for the outputs to either follow the pulse width of the clock or be maintained high until the next clock. This function is also CV controllable for interesting rhythm modulations. This rather obscure function allows for an extremely wide range of uses. This is a module that rewards exploration. Additionally, multiple Gaetos can be chained together using the included cable to create shift register functions. This design relies on CD4000 series ICs (4013 and 4081). These were selected for their reliability, high speed and low power consumption. Power cable and 3 pin dupont cable for chaining modules are included.

Power: 24mA @+12V, 12mA @-12V

Width: 6 HP

Depth: 26mm

Panel: black or grey

This is a Do-It-Yourself kit, not an assembled module. Building instructions can be found here. All SMT components are pre-polulated, you only have to solder through-hole parts.

DIY level: easy

Eowave's Weather Drones is an all in one drone voice for eurorack modular. The Weather Drones can be self patched, or used with other eurorack modules via CV and trig inputs. Check out this video. The architecture of the module is as follows, some of which is pre-patched:

• Digital tri wave oscillator, controls are freq, spread (adds more triangle waveforms, up to 8), character (wave folder), fm in with attenuator

• LFO with square and tri wave out

• Filter with cutoff and feedback, mod input with attenuator and second mod input without

• AD envelope with level attenuator

• Random sample and hold noise (driven by square wave LFO) with slew

• VCA

It is available in 2 versions:
1) v1.1 as a partial kit. Means: you have to source your own parts. It's all through-hole components (THT), no SMT. Check the Bill of materials (BOM) in the asembly manual.
2) v1.5 as full kit. This version is technically updated and all SMT components are already pre-populated. All THT to be soldered by you.

* Before you ask yourself: the big potentiometer is delivered without nut. It's ment to be like this.

Technical details:
• 100mA +12V, 10mA -12V

• 24HP, 38mm deep

This is a Do-It-Yourself kit, not an assembled module. Building instructions can be downloaded here.

DIY level: both versions easy/medium

Wired Heart is a battery powered experimental sound synthesizer. It features six sensors which can detect touch and humidity. Each of the sensors controls the pitch of an oscillator: Press harder or have more sweaty hands to get a higher pitch. Touch multiple sensors at the same time to create crazy cross modulations by the current flowing through you. Each sensor serves a different function. It is best to explore the Wired Heart sound universe by trial and error.Just insert a 3V CR2032 battery and have fun! Here is a YouTube video about it!

How Does It Work? There are two master oscillators, each controlling two slave oscillators. The slave oscillators are modulated in different ways: The left master osc modulates the amplitude of its associated slave oscs. When the master frequency is low you can hear the two slave oscs being turned on and off alternately. Higher frequencies create weird, sometimes voice-like sounds - in stereo. The upper right slave osc is modulated in a hardsync-like way. The osc is reset each time the master osc starts a new cycle. This creates rich sound spectra reaching from stutter to voice-like sounds to unexplainable stuff. The lower right osc is frequency modulated by the master osc. At lower master frequencies this creates tremolo effects. At higher frequencies you will hear sounds like bells or voices. Via the stereo output jack the Wired Heart can be connected to an amplifier or headphones. The output jack additionally works as a power switch. If disconnected, Wired Heart is in standby mode and consumes very little power.

Upgrade Each oscillator of Wired Heart comes with extension ports to connect additional electronics. The kit comes with 3 LEDs, 3 LDRs and a potentiometer. By using the LDRs the oscillators will react to light. This can be your hand covering an existing light source, a flashlight shining onto the heart or the light of one or more LEDs. The LEDs in turn flash with the rate of the oscillators. By simply connecting a few components you can create a never-repeating, chaotic self driven sound source.

Building instruction is included in the box.

DIY level: easy as fuck, only a few solder joints, as most is pre-polulated SMT parts.

Monotropa is a 4 band feedback equalizer distortion module. This is the third revision of the Feedback EQ distortion module. Here is a video and here a Soundcloud demo.

Features:

• 4 band feedback EQ distortion

• 2x audio / CV inputs

• 2x audio / CV outputs

• EXT audio input, EXT audio outputs (SEND RETURN path)

• 4 potmeters for frequency volume

• 1 potmeter for feedback amount

• 1 potmeter for gain amount

Use this effect as a sound destructor, weird oscillator, CV mutator. Route effects through the EXT path for more audio mangling and adding CV ‘sidechain’ control over the feedback path.

Power: +12V: 15mA, -12V: 15mA

Width: 8 HP

Depth: ?mm

This is a Do-It-Yourself kit, not an assembled module. The building instructions are here.

DIY level: easy/medium.

A five channel audio mixer with 3 outputs for easy feedback routing. Black panel with 555 pentagram – the extra evil mixer! Here is a video and here a Soundcloud demo.

Features:

• 5 channel audio mixer

• 5 channel volume potmeters

• 1 SUM gain potmeter

• 2 normal outputs

• 1 inverted output

For feedback mixing: route output 2 to an effect, for example a distortion, equalizer, filter. Patch the output of that effect back into a channel of the Pentamix. Open up that certain channel for unholy feedback sounds of the other dimension. The inverted output gives other results. try it! This is an easy project, very suitable for beginners as a first soldering project. Highly functional for any modular user!

Power: +12V: 4mA, -12V: 4mA

Width: 8 HP

Depth: ?mm

This is a Do-It-Yourself kit, not an assembled module. The building instructions are here.

DIY level: easy/medium.

The newest version of the Noise module, an oscillator based on a CMOS Logic IC.

Noise! has got 4 knobs for frequency, 4 CV inputs, 4 outputs, an internal patchbay, range jumpers for OSC1 and OSC2 and several modding possibilities. This new v8 PCB & panel don’t need any wiring and are suitable for skiff cases. The synth is based on 4 squarewave oscillators that modulate each other, go through a clock divider and are mixed together to create harsh noise and random control voltage. The result is often unpredictable and evolving, suitable a source for snares, hihats or as ‘unpure’ audio texture designs. When the range jumpers are placed, a whole new beast appears. Chaotic structured beats, noise rhythms and artifacts are spitted out. Checkout the Soundcloud demos.

• 4 x Frequency knob

• 4 x CV In

• 4 Outs

• Transparent knob

Power: +12V: ?mA

Width: 8 HP

Depth: 45mm

This is a Do-It-Yourself kit, not an assembled module. The building instructions are here.

DIY level: easy/medium.

Noisefoc (now v1.1 with better CV input) is an experimental Oscillator, good for noise and Pan Sonic style buzz sounds. It's nice as a pure sound source or as a base for hihat and percussion sounds. Noisefoc is a great learning project, in the manual the basic parts and their functions are explained. It is based around three CMOS NAND gates as oscillators, controlled by potentiometers and a light dependent resistor (LDR). There's an optical representation of the frequencies via LEDs, two mixing circuits (different sound via diode or resistor mixing) to mix the oscillators and a power starving function which makes the device completely out of control. The Eurorack version features a CV input for pitch influence via optocoupler.

The frontpanel was designed by Hannes Pasqualini / Papernoise.

DIY level: easy. Download the building instructions and manual here.

VCO-1 (v1.4) is a purely analogue VCO (oscillator) for the modular Eurorack system. It can complemented by EXP-1 Expander module to add many functions like Sync, lin. FM, Wave Morphing, LFO etc. VCO-1 is temperature stable and provides a clean 1V/oct tracking over minimum 4 octaves. VCO-1 and EXP-1 are a powerful combination of modules with lots of instant fun! High quality parts, switches, pots and knobs, good feeling and big enough for comfortable everyday work, no fiddly controls. Check out the module on Modular Grid.

Here is a build video about VCO-1 and EXP-1 by Synth DIY guy. Very nice to watch before you build it, specially for beginners.

Controls:

Tuning (Coarse) ca. 20Hz - 20kHz

Tuning (Fine) ca. 8 half tones

Pulsewidthmodulation (PW)

Connectors:

1V/oct input for CV-controlled pitch

PWM input for CV-controlled pulsewidth

Pulse audio output

Saw audio output

Power consumption: +12V: 18mA -12V: 17mA. Width: 10 HP, depth 35mm. This kit has all the necessary parts to build, including front panel and power cable. Building instructions and manual can be downloaded here. The frontpanel was designed by Hannes Pasqualini / Papernoise.

DIY level: medium. After finishing it, the 1V/oct tracking has to be adjusted, what might need some experience.

EXP-1 (v1.3) is an expander module for our analogue Eurorack oscillator VCO-1. It adds an LFO (bi-polar LED) with two waveforms (square, triangle) and various modulation targets, sync, lin. FM, wave morphing, an additional triangle output etc. Together with VCO-1 it is a complex oscillator with lots of internal or external modulation possibilities. Check out the module on Modular Grid.

Here is a build video about VCO-1 and EXP-1 by Synth DIY guy. Very nice to watch before you build it, specially for beginners. 

Controls:

LFO Freq. ca. 0,01Hz - 200Hz

LFO Amt. (target via selector)

Lin FM (int. LFO / ext. signal)

Morph (int. offset / ext. CV)

LFO Shape (Saw / Square)

LFO Target (Morph / PW)

Morph Mode (Tri-Spare / Tri-Saw)

Connectors:

LFO Freq (ext. CV influences LFO Freq.)

Lin FM Input

Morph CV Input

Sync Input

LFO Output

Morphed Output

Triagle Output

Power consumption: +12V: 16mA -12V: 18mA. Width: 10 HP, depth 35mm. This kit has all the necessary parts to build, including front panel and power cable. Building instructions and manual can be downloaded here. The frontpanel was designed by Hannes Pasqualini / Papernoise.

DIY level: medium.

Descent is an analogue dual envelope generator. It provides 2 independent voltage controlled decay EGs. The envelopes can be switched between triggered or gated (sustain) mode. The first trigger input is normalized to the second one and each channel provides a LED to visualize the envelope signal. The shape of the envelope can be adjusted between lin/exp with a trimmer on the back of the PCB. Decay times are adjustable between a few ms up to several seconds. It comes as a complete kit with all needed parts to build it. That includes a multi colour aluminum frontpanel, high quality jacks and smooth 9mm metal pots.

• Current draw: +12V 70mA | -12V 30mA
• Width: 6HP
• Depth: 40mm
• CV input voltage: +/-5V
• CV output voltage: 0-8V.

Building instructions can be found here. DIY level: easy, medium.

THIS IS THE BLACK PANEL EDITION!

The TubeOhm SMR4P is a 10HP Eurorack Multimode VCF that combines the best features from two different filter circuits. The SMR4P design features the warm sound of the SMR4MkII filter alongside the 15 various filter shapes of the 4-Pole Mission VCF. This makes SMR4P a powerful ‘Swiss Army Knife’ filter, that can be switched between different filter types and slopes depending on your current need. This design also has some extra creative features, such as voltage-controlled switching between filter types, VC Cutoff Modulation, internal FM and a built-in VCA.

• Lowpass Modes: 6 + 12 + 18 + 24dB
• Hipass Modes: 6 + 12 + 18dB
• Bandpass Modes: 6 + 12dB
• Other Modes: HP2LP, HP3LP,Notch,Phaser, Notch+LP1, Phaser+LP1
• Current draw: 50 mA on + 12V, 30 mA  on -12V
• Width: 10HP
• Depth: 55mm
• Freq. Range: 20Hz - 22kHz

Building instructions can be found here. DIY level: advanced.

An essential tool for DIYers! Test 3 is a tool for measuring voltages and currents in your Eurorack system. This means that just a single circuit board or module can now replace a convoluted test setup with multiple multimeters, custom cables etc. Two push buttons allow you to cycle the value shown on the LED display between three measurements (voltage, current and stored peak current) of the three power rails. The peak currents continually update in the background on all rails, making it ideal for quickly getting maximum current figures. Apart from measuring the current draw of a single module, Test 3 also supports testing power supplies and cables, measuring an entire system (up to 1 A of current on each rail), troubleshooting DIY modules, powering a skiff or breadboard from a larger system...

• Width: 8 HP
• Current draw: +12: 35 mA

DIY level: easy. Building instructions can be found here.

This current edition has temporarily a black panel!

Penrose is a very nice CV quantizer DIY kit for the eurorack format. It takes an incoming continuous CV voltage and converts it to the nearest note in a scale. Active notes can be selected with the 12 buttons. You can use it to tune the output of your analog sequencer, as a semi random melody generator, for fast chiptune arpeggios and much more. It comes as a complete kit with all needed parts to build it. That includes a multi colour aluminum frontpanel, high quality jacks and illuminated bi-color push buttons. The project is open source, so the schematic and source code is available.

Specs:

• Current draw: +12V 60mA | -12V 2.5mA

• Width: 6HP Depth: 40mm

• CV input voltage: 0-10V
CV
• Output voltage: 0-10V

Building instructions, more infos and demos can be found here.

DIY level: easy/medium.

Mal-2 is a random signal generator mainly intended as CV modulation source. It has 2 modes of operation to provide you with smooth random goodness. Imagine Eris herself lends you a third hand to keep your patches interesting. 1) In the first mode the CHANGE knob morphs from a cubic interpolated (sine like shaped) random signal to a random walk function that could make a wallstreet broker delirious with joy. 2) In the second mode the CHANGE knob sets the self similarity. On the minimum setting the signal is completely random. On the maximum setting the random sequence is locked to a repeating, identical 8 step sequence. In between the sequence seamlessly morphs to new shapes over time. This gives you a random CV where you can shape the bounds in which the chaos unfolds and goes far beyond a slew limited white noise.

Specs:

•     6 HP
•     12 bit CV output
•     through hole components DIY kit
•     Random gate output
•     CV inputs with attenuverter for both knobs
•     super slow cycles times up to lower audio range
•     +12V 60mA | -12V 5mA

Building instructions, more infos and demos can be found here.

DIY level: easy/medium.

Dual Velocity Voltage Controlled Amplifier

The VVCA is an analog dual linear VCA can be used for audio and CV signals. The VVCA features two individual VCA’s. Each VCA behaves just like any other normal VCA when there is no cable connected to the velocity input. The velocity input offers velocity control over the CV input level, which means: The output level can be controlled by CV and Velocity.
Width: 4HP, power consumption: +12V (15mA), -12V (15mA), 5V (10mA)

Here is a demo video. Building instructions can be found here. DIY kit includes all parts.

DIY level: easy

Midi To CV Converter

Width: 14HP, power consumption: +12V (39mA), -12V (25mA), 5V (30mA)

Here is a building video on YouTube. Building instructions can be found here. DIY kit includes all parts.

DIY level: medium

The perfect solution for midifying small analogue synths or gadgets due to small dimensions: 17x12x4mm. The PCB itself comes assembled. Midi input, one pair of CV/Gate outputs, V/Oct scale only, stable scale over four octaves, MIDI-learn button and configuration via Sys-Ex. Made by Midi-Hardware.com. We also offer a full kit, including box and all you need to build a full standalone interface with a small budget. Power supply available separately here. Please check detailed info and instructions before you buy, they can be found here.

DIY level: easy. The PCB itself comes assembled, only a few cables to solder.

AVAILABLE AGAIN 2027 or a lifetime later!

Our converter is a top solution for:

• any DIY project that needs clean and stable 9V like guitar pedals etc.,
• if you want to migrate your 9V projects into your Eurorack system or want to create a stable 9V source from your Eurorack,
• and generally all projects like Fuzz boxes, which suffer from bleed through caused by dirty switching supplies.

All that mess is cleaned up!

Our converter uses 12V (DC) -+20% on the input and generates a stabilized, very clean 9V +-1% of 150mA at the output side. It also is save against wrong polarity on the input, overpower save due a self resetting fuse. It works with all of our 12V DC power supplies.

DIY level: easy. The PCB itself is assembled, only a few cables to solder.

We developed this module to power modules like our TR-808 Kick or single Eurorack modules by a standard power supply. It uses 12V to 18V (DC) on the input and generates a symmetrical output of +/-12V (1W) at the output side. It also is save against wrong polarity on the input, overpower save due a self resetting fuse. It's a top solution for any DIY project that needs symmetrical power. A more powerful version is also planned. We also offer a power supply for it.

DIY level: easy. The PCB itself is assembled, only a few cables to solder.