VCO-1 is an analogue VCO (oszillator) for the modular Eurorack system. From spring 2017 it can be complemented by VCO-1 Expander, which adds many functions like Sync, lin. FM, Wave Morphing, LFO etc. VCO-1 is temperature stable and provides a clean 1V/oct tracking over minimum 5 octaves. Will be a powerful combination!!!

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: 25mA -12V: 20mA. Width: 10 HP, depth 40mm. This kit has all the necessary parts to build, including front panel and power cable. Building instructions, more infos and demos can be found here. Additional info: Unlike most DIY manufacturers, we produce our panels and circuit boards in germany. We also only use quality materials and durable parts. We hope that our customers appreciate and support that, even if it will cost you and us some extra €. The frontpanel was designed by Hannes Pasqualini / Papernoise.

DIY level: medium. The VCO-1 DIY kit can be built by medium experienced DIYers in about 2-4h. After finishing it, the 1V/oct tracking has to be adjusted, what might need some experience.

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.

The 2M is a dual three channel mixer in 6 HP with volume controls over all the inputs as well as the final output. As its design has been specially focused on audio applications, the input potentiometers are audio-taper type while the output ones are linear. Low distortion / high quality audio operational amplifiers have been selected in order to achieve clean audio mixing, but is also DC-coupled, so it can perform CV signal mixing as well. Great for a small system, allowing for submixes or even stereo mixing.

Specs:

• 6HP
• 38 mm depth
• Consumption: +/-12V 25mA

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

DIY level: easy/medium.

The 8S is an 8 step sequencer in 8 HP with control over parameters of the sequence as reset, hold, random step and direction. It’s been designed to work with clock related signals like triggers or gates but any type of CV signals can be used at its inputs. The output signal path is completely analog and its range can be set as unipolar (0 to +5 volts) or bipolar (-5 to +5 volts) via jumper on the back.

Specs:

• 8HP
• 38 mm depth
• Consumption: +12V 55mA, -12V 10mA

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

DIY level: easy/medium.

MiniAtt is a skiff friendly 2HP dual passive summed attenuator with toggle switches to turn each channel on or off. Both channels are normalled to the sum. There will be some signal loss at the sum out, as the module is passive. Great for CV or audio although the module ships with linear pots. Aluminum panel. No power consumption, it's passive.

Specs:

• 2HP
• 2 Chn. Attenuator & Mixer

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

DIY level: easy.

The Zlob Modular Attenumixer is a skiff friendly three channel passive attenuator with a sum. Each channel is normalled to the sum (VI) so it can be used as a 2 channel mixer and 1 channel attenuator, or a 3 channel mixer, or as 3 separate attenuators. Normalization to the sum is broken by inserting a jack into the outs of channels I-III. The Attenumixer works well with both CV and audio, although the potentiometers have a linear response. Since this module is passive there will be some amount of signal loss with the sum out. No power consumption, it's passive.

Specs:

• 4HP
• 3 Chn. Mixer / Attenuator

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

DIY level: easy.

Each of the module’s two channels has a unique wavefolding profile. At each input there are two CV inputs for controlling the level of waveshaping including one that passes through an attenuverter. A wavefolder converts simple signals into richer and more dynamically changing ones. In contrast to a filter, wavefolding adds harmonic content to the waveform. It works by amplifying the waveform until it begins to saturate, then rather than clipping, the waveform gets folded back in on itself. The CHOPPING KINKY is DC coupled allowing it to be used for both CV and audio duties; to generate harmonics on an audio signal or kinking LFOs and envelopes.

Power consumption: +12V: 65mA -12V: 55mA. Width: 8 HP, depth 30mm. This kit has all the necessary parts to build, including front panel and power cable. Building instructions, more infos and demos can be found here. A nice building and demo video by Quincas Moreira alias Synth DIY Guy is here.

DIY level: medium.

The Rampage is Befaco’s approach to an old invention: the Serge/Buchla ramp generator. We took the idea of a “patch programmable” function generator/processor, put two units in the same module and tried to expand them with new funky functions and ways to combine them: Slope detectors, analogue logic functions and a few extra outputs to add some more complex features. The module is built around two voltage controlled integrators. Integrators (also known as Lag Processors or Slew limiters) allow you to process your voltages, converting sharp square waves in ramp-like waveforms.

These devices can, for instance, convert a gate signal into a simple envelope, or achieve a “portamento” or “glide” effect when applied to pitch CV. Other well known application of an integrator is it’s ability to low-pass filter an audio signal. Further information and example patches can be found in the user manual or in the videos.

Power consumption: +12V: 110mA -12V: 90mA. Banana or minijack connectors available. Width: 18 HP, depth 30mm. This kit has all the necessary parts to build, including front panel and power cable. Comes with all SMD Parts pre-soldered! Building instructions, more infos and demos can be found here.

DIY level: medium/advanced.

The Sampling Modulator is a multi-function module that lies somewhere between a VCO, a Sample & Hold, and an 8 step trigger sequencer. This module can function as:

• Sequencer Clocked Sample & Hold
• Analog Down-Sampling Effect
• Sampling Modulator/Shaper
• 8 step trigger sequencer
• Unusual V/oct VCO

You can download the building instructions, manual and see a video via our info page. Instructions include all info you need for a successful building in English. For detailed info about Sampling Modulator check out the Befaco website. Power consumption: +12V: 48mA -12V: 18mA. Width: 8 HP, depth 47mm. This kit has all the necessary parts to build, including front panel and power cable.

DIY level: medium.

• Power consumption: +12V: 14mA, -12V: 11mA

• Width: 8 HP

• Depth: 50mm (inc power connector)

You can download the building instructions (english) and manual via our info page. This kit has all the necessary parts to build, including front panel and power cable.

DIY level: easy.

DIY kit version of the ultrastable even Voltage controlled oscillator (VCO) with great precision, designed to be stable even in the case of power supply fluctuations. Supplied with an octave selector of 10 positions from 32′ to 1/16′ (C0~C9). It’s able to track with a precision of 1 Cent from C0 to C7, 4 Cents in C8 and 13 Cents in C9.

Outputs: Triangle, Ramp, PWM, Sine, Even (waveshape with emphasis on even harmonics).

Inputs: Hard sync, V/oct, Lin FM, PWM CV. Power drain: +12V – 36mA, -12V – 26mA. Size: 8HP / 47mm Depth.

This kit has all the necessary parts to build, including front panel and power cable. Comes with all SMD Parts pre-soldered! Building instructions and demos can be found here.

DIY level: medium/advanced.

The VC ADSR is our take on the classic ADSR: now smaller, more powerful and user friendly. This compact unit features voltage control for each stage with manual faders to improve usability, feel and aesthetics. A unique feature of the VC ADSR is the gate outputs for each stage of the envelope offering an extra level of control over your patch! Envelope generation can be triggered and controlled with the use of the panel mounted push button or with the trigger/gate input. Control of the response curve between each stage of the envelope (from linear to logarithmic/exponential) is provided by a potentiometer. For in-depth information on the module take a look to our user Manual and Demo Video. Power: +12V: 55mA -12V: 25mA +5V: 0. Width: 8 HP / 30 mm depth. This kit has all the necessary parts to build, including front panel and power cable. Building instructions and demos can be found here.

DIY level: medium/advanced.

Befaco  Output Module II is designed to be the master output for your modular system.

Features

• The module is capable of stereo or mono operation and converts synth level signals to pro line level (+4dBu).

• It also features a 3.5mm jack to 6.5mm TRS jack for easy communication with the outside world.

• Also featured on the module is a headphone amplifier with a 6dB/Oct High-pass filter (fixed on 60Hz) to avoid “pops” and undesired noises when connecting your modular directly to a P.A.

• A switch is included to send a mono input to a left and right stereo output (particularily useful setting is useful when you connect the synth to a DJ mixer without mono inputs).

• Last but not least, it features two 6.5mm to 3.5mm jack input converters.

Power: +12V: 24mA -12V: 14mA. Width: 6 HP / 47 mm depth. This kit has all the necessary parts to build, including front panel and power cable. Building instructions and demos can be found here.

DIY level: easy.

Dual Atenuverter is a CV/Audio utility module designed to attenuate, invert and apply offset to an input signal.

Features
The “ATENUVERTER” pot will multiply your signal by 1 when turned clockwise and -1 when turned anti-clockwise.

The “OFFSET” control can add +/- 10V DC to the output. Useful as a manually controlled DC source when no input is connected.

Bicolour LEDs glow red when the output is positive and green when negative meaning this module works well as a CV monitor.

Specs

• Current needs: +12V: 21mA, -12V: 18mA

• Width: 5 HP

• Depth: 24 mm (inc power connector)

This kit has all the necessary parts to build, including front panel and power cable. Building instructions and demos can be found here.

DIY level: easy.

A voltage controlled slew limiter, AKA Lag Processor.

Features

A Slew limiter is a device that smoothes an incoming signal, limiting the maximum rate of change of the output voltage over time. It is widely used with pitch CVs to obtain portamento but is also very useful for converting a gate signal into a basic envelope. The module has independent time controls for rising and falling voltages, each with it’s own CV.

• Current needs: +12V: 10mA, -12V: 10mA

• Width: 6 HP

• Depth: 31 mm (inc power connector)

 Building instructions can be found here.

DIY level: easy.

Second version of our Crush delay. An echo-delay unit based on PT2399 that specializes in generating digital garbage and noise! This unit has been improved greatly from first version and signal routing has been changed to improve performance possibilities. Crush Delay v2 has two VCAs that will control the amount of signal that is sent to the delay. First input routed to dry/wet and delay and second one directly to delay. With this second input and Send output we can do external feedback routings (See block diagram). The biggest improvement has been made to the control of PT2399 itself, applying circuit bending techniques. It has an improved and extended speed control, getting a wider range on Crush area as well as a smoother control, converting this unit into a VC digital garbage generator! It includes three gate controlled switches that enables three bends to the chip, providing an even greater variety of digital noise, glitches and nasty mayhem! Of course, crush Delay v2 can be used as an echo-delay unit with around 400 ms clean delay time. and up to 2 seconds of dirty delay. Features VC feedback with an automatic gain control to keep levels stable at any feedback level.

Power: +12V: 75mA -12V: 35mA. Width: 11 HP, depth: 47mm. This kit has all the necessary parts to build, including front panel and power cable. Building instructions and demos can be found here.

DIY level: medium.

This is a dual Hi/Low pass filter. Inspired by the famous sallen key filter from MS-20 early version. It has attenuverters (inverter-attenuator) as an addition to the normal CV control in Cut-Off and CV control for the resonance with a little more presence of the resonance than the original. The normal CV control for Cut-Off keeps tracking trough 3 octaves. The ‘Link’ switch connects the input of the second into the output of the first to have it in series. Can be powered with +/-12V or +/-15V without changes.

Selectable HP/LP mode 6/12 dB. Cutoff and resonance CV controlled.

Power: +12V: 40mA -12V: 35mA. Width: 17 HP, width: 47mm. This kit has all the necessary parts to build, including front panel and power cable. Building instructions and demos can be found here.

DIY level: medium/advanced.

Binary is cooler than you might think! It's a 1-bit analog computer that takes up to six inputs and determines whether the output should be high or low. It is intended to combine gates/triggers from Algorhythm modules, but works with most other CV and audio sources within a modular system. Each input includes an on/off switch that illuminates when a pulse is received. The output can be switched from OR to NOR logic for different applications. This is a complete DIY kit, which includes all components, all hardware, a panel, a PCB, and a power cable. Familiarity with building electronics using SMD components is expected (most are 0805 size). PCBs are white with gold ENIG finish. Building instructions and demos can be found here.

DIY level: medium. You have to solder SMD components.

Our BassTrommel ist a modified clone of the legendary Roland TR-808 bassdrum including a piezo-sensor for triggering it manually, and a variable pitch control. We added a trigger-mechanism which makes it very easy to play the Kick by audio signals. Make sure to check the demos and instructions before you buy, they can be found here. It runs on +/-12V, you can use our +12 to +/-12V power converter for it.

DIY level: medium / advanced + you need a good iron.

The first collaboration between RYO and KYMATICA DEVICES, a dual VCA / Crossfader / Four-Quadrant-Multiplier (Ringmodulator / VC-polarizer) with mix output. The output of the first channel is normalized to the input of the second. Works for audio as well as CV. Tune in, multiply, fade out! Switch position upside down A > A: In this mode input A and the CV input acts as a Four Quadrand Multiplier. It will do ringmodulation and voltage controlled polarization (bipolar VCA). Switch position 0 > A: In this mode input A and the CV input will act as a normal linear VCA. Switch position B > A: In this mode the CV input will control a crossfade from input B to input A.

Width: 8HP, depth: 40 mm, max power: +12V 34 mA / -12V 32 mA

Building instructions will follow soon and can then be found here.

DIY level: medium.

An extremely useful module: Ampmix is an easy to build 4-channel amplifying mixer/attenuator with 2.0x gain (6dB) and 5.0V offset on each channel in an 8HP module. No calibration required. It was designed as a handy CV mixer and processor with good precision, high input impedance and buffered outputs. It could be upgraded for even better precision as described in the assembly manual. It will also work great with audio, even with full gain giving some distortion possibilities or gaining external gear. It works as a 4 channel mixer, 1 attenuator + 3 channel mixer, 2 attenuators + 2 channel mixer or 4 attenuators. Width: 8HP, depth with power cable attached: less than 35 mm, power: +/- 22 mA. More detailed info, demos and instructions can be found here.

DIY level: easy.

An AC coupled, Voltage Controlled Amplifier (VCA) full DIY kit for Eurorack system in a compact 4HP size, skiff friendly 30 mm depth. The design is based around the THAT2180 chip and gives a response right down to 90dB fully closed. AC coupled input & output. Exponential control voltage response (0 to +5v range for CV input).

Width: 4HP, depth: 30mm, power: +/- 12v @20mA. Instructions can be found here.

DIY level: easy.

What and why the B.I.Y. idea? The B.I.Y. kits are designed to allow anyone to easily create professional quality, reliable versions of their favourite (or personally designed) guitar pedals at home. The circuit board requires no off-board wiring greatly reducing the potential for failure while vastly reducing build time. The board also features dedicated space for a voltage regulator, reverse-polarity protection, filtering capacitors, on/off indicator LED, and creating 1/2Vcc. 

We offer 4 different kits: Bazz Fuss (Fuzz), SHO Boost (Zvex Super Hard On clone), Cave Dweller Delay and Tube Screamer (Classic Distortion). They always contain the bare-bones B.I.Y. guitar pedal kit, a predrilled Eddystone aluminium enclosure, all the components, wire and ~5g high-grade solder plus components for the kit of your choice. Instructions can be found here.

DIY level: easy to medium.

Our converter is a top solution for any DIY project that needs clean and stable 9V. 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.

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.