Leaf Audio - VCO-1

VCO-1 is an analogue VCO (oszillator) for the modular Eurorack system. From early 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.

 

You can download the building instructions via our info page.


Sonic Potions - Penrose

Penrose is a simple 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. The project is open source, so the schematic and source code is available.

 

You can download the building instructions via our info page.


Sonic Potions - Mal-2

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.

 

You can download the building instructions via our info page.


Grayscale - Algorhythm & Binary

Algorhythm is a really cool trigger sequencer and was made to work with Binary, which we also have in stock. You can download the building instructions via our info page.


TR-808 Kick

You can download the TR-808 Kick building instructions via our info page. The package includes all info (German / English) you need for a successful building,  more pictures and instructions. Also an Ableton Live set for learning how to trigger the Kick by audio plus  samples for perfect audio triggering.

 

The TR-808 Kick runs on symmetrical power of +/-12V or +/-15V (DC). If you do not have such a power supply, you can use our own +/-12V power strip, which generates a stabilized and clean symmetrical power of +/-12V (DC) out of a standard +12V (DC) power supply. Find it in the shop here and power supply is here.

 


NTBA (All versions)

You can download the NTBA building instructions via our info page. The packages include all info you need for a successful building in German and English, more pictures and instructions about the 1V/Oct scaling. Checkout the massive amount of functions in the Eurorack version.

 


Befaco - Chopping Kinky

Chopping Kinky is Befaco's new dual channel Wavefolder.

 

You can download the building instructions for all kits via our info page. Instructions include all info you need for a successful building in English.

 

Another nice building and demo video by Quincas Moreira alias Synth DIY Guy is here.


Befaco - VC ADSR

You can download the building instructions for all kits via our info page. Instructions include all info you need for a successful building in English.


Befaco - Output

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.

 

 

 

Specs

  • Current needs: +12V: 24mA, -12V: 14mA
  • Width: 6 HP
  • Depth: 47 mm (inc power connector)
  • Aluminium, heat-treated front panel
  • Designed, kits prepared and completed modules assembled in Barcelona
  • Banana connectors available upon request

You can download the building instructions for all pedals via our info page. Instructions include all info you need for a successful building in English.


Befaco - Dual Attenuverter

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)

You can download the building instructions for all pedals via our info page. Instructions include all info you need for a successful building in English.


Befaco - Rampage

You can download the building instructions for all pedals via our info page. Instructions include all info you need for a successful building in English.


Rampage is an extremaly powerful module. Some Rampage applications:

-Voltage controlled Attack Decay envelope

-Attack Sustain Release Envelope

-More complex ADSR Style Envelope

-Dual VCO. With Square, PWM, Saw, Log, Exp and Triangle shapes. Hard and soft sync

-Gated VCO

-VCO + Analog AND Gate (As ADTimbral VCA)

-Dual Low Pass Filter

-Dual Low pass Filter with VCO soft sync

-Low Pass Filter + AD Envelope

-Dual “syncable” voltage controlled LFO with Square, PWM, Saw and Triangle shapes)

-Complex LFO . Function combination

-CV controlled and “Ping-Pong” LFO

-Dual Slope detector. Distinguishes when and incoming signal (CV or audio) is rising or falling, and generates gates in concordance.

-Comparator. Send a gate when B IN is bigger than A IN

-Polyrythmic gate generator. With both channels synced between each other, it generates several “complex rhythm” gates.

-Voltage controlled Slew limiter with independent attack and decay control and continuous variable shape between Log, linear and expo

-Peak Voltage follower. Max Out follow the maximum Level of the two inputs

-Minimum Voltage Follower. Min Out follow the minimum level of the two inputs

-Envelope follower with adjustable response for rising ans falling flanks

-Voltage controlled Trigger Delay

-Burst Generator

Befaco - Sampling Modulator

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 for all pedals via our info page. Instructions include all info you need for a successful building in English. For detailed info check out the Befaco website.

 


Befaco - Mixer

A Four channel active mixer, suitable for audio or control signals.
It features regular and inverted outputs as well as an LED level meter.

  • Current needs: +12V: 14mA, -12V: 11mA
  • Width: 8 HP
  • Depth: 50mm (inc power connector)

You can download the building instructions for all pedals via our info page.


Befaco - Slew Limiter

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)

You can download the building instructions for all pedals via our info page. Instructions include all info you need for a successful building in English.


Befaco - Even VCO

You can download the building instructions for all pedals via our info page. Instructions include all info you need for a successful building in English.

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.


Befaco - Crush Delay

You can download the building instructions for all pedals via our info page. Instructions include all info you need for a successful building in English.


Befaco - BF-22 Sallen Key VCF

You can download the building instructions for all pedals via our info page. Instructions include all info you need for a successful building in English.


Maker.ie - B.I.Y Pedals

You can download the building instructions for all pedals via our info page. Instructions include all info you need for a successful building in English.


RYO - Optodist

You can download the building instructions via our info page. The package includes all info you need for a successful building in English. The Optodist runs on +-12V in any Eurorack case, a bus cable is included.

 


RYO - Triple VCA

You can download the building instructions via our info page. The package includes all info you need for a successful building in English. The 3xVCA runs on +-12V in any Eurorack case, a bus cable is included.

 


RYO - Aperture


You can download the building instructions via our info page

 

The RYO Aperture is a vactrol lowpass filter and VCA module inspired by the much beloved 292 Lopass Gate from the Buchla 200 series modular system of the 1970s. However, rather than being a straight up clone, the Aperture is a newly developed and reworked design for eurorack modular synths. Aperture can be used as a 12dB lowpass filter, a VCA or a combination of the two similar to the 292 but also adds a new switchable resonance circuit. This solution gives you no less than 6 different characteristics!

 

* Non resonant lowpass filter

* Resonant lowpass filter

* Both: Non resonant lowpass gate

* Both: Resonant lowpass gate

* VCA

* 6dB variety of resonant lowpass gate in the VCA mode with resonance on.

 

The resonance goes from smooth and twangy to increasingly bubbly and acidic to wild and untamed howling towards the end of the pots range. The self-oscillation also lends itself well to creating kickdrums, toms and other percussive sounds.

 

The result is a very wide range of sound shaping possibilities, from the classic resonant filter sweeps of east coast to the plucky acoustic timbres of west coast synthesis and everything in between.

 

Also added is a unique "Klang" function. The Klang input generates a decay slope from a trigger, the shape is very steep in the beginning and quickly smooths out to a nice prolonged ring, resulting in a very natural acoustic sounding tone.The circuit was specifically tailored for this purpose and does not give the same result as just using a decay envelope with the regular CV input. Experimenting with different trigger voltage and length will affect the response of the decay and overall shape. It will also work with other control voltages but will add a falling slew to the signal. Trigger the CV as well as the Klang input at different intervals for simulating the impression of striking a drum or string instrument in different ways.

 

Finally, the input is AC coupled and has a dedicated attenuator with clipping overdrive towards the end of the pot range for adding a bit of extra bite to the incoming signal. The signal input is scaled for 10Vpp audio signals. The AC coupling comes after the overdrive circuit so you can add offsets to your audio with RYO Ampmix and many other modules to get an asymmetric clipping.

RYO - Logic Modules

This modules are powerful tools when you work with sequencers and clocks and you want to create interesting rhythmical variations. Combined with for example the 4ms Quad Clock Distributor and driving some Pentas this modules become weapons.

The circuitries of the RYO logic gate modules are directly modeled after the very earliest form of digital logic gate designs using resistor-transistor-logic (RTL) pioneered in the 1950s and used in computing equipment throughout the 50s and 60s. The Apollo Guidance Computer for instance used the same type of 3-input NOR gate design now found in the RYO NOR/OR module, although in vastly greater numbers.
 
The RTL circuit design gives the modules some interesting quirks thanks to the transistors threshold windows when playing around with different amplitudes, waveforms and frequency rates of the incoming signals, making it fun and useful to explore beyond typical logic gating duties, for example as an audio waveshaper/distortion.


RYO - Ampmix

The Ampmix Kit is a novice-friendly project, it is a low part count, single-PCB build that only requires the most basic experience in PCB soldering and module assembly. Kits comes supplied with PCB, front panel (PCB material), component kit, knobs, power cable and mounting screws. Solder and tools are not supplied. You can download the building instructions via our info page.

RYO - VC Sequencer & Trig Xpander

Compact 8-step sequential voltage source in 10HP with optional trigger/gate output expander (4HP). Two modes: 1) Can be used as classic forward/backward operation using a clock or 2) driven by any control voltages or audio.

 

You can expand it by the Trigger Xpanders to get more trigger or gate outs (adjustable) or getting more CV outs using additional attenuators after the gate outs.

 

You can download the building instructions via our info page.


RYO - Paths

Some additional info to the shop text:

CV Mode: In CV mode there is two CV inputs. The one that shares the reverse clock input is full wave rectified and the one that shares the forward clock input is half wave rectified. It uses an active rectifier without voltage drop or a dead zone around 0V.

 The half wave rectified (FWD) with one bump on the rectifier symbol, will clip any signal below 0V and above 5V. The difference to the full wave rectified input (REV) with two bumps on the rectifier symbol, is that it will turn any negative volt into positive as well. So -1V is the same as +1V and -5V is the same as +5V etc.

The CV inputs are mixed together so they can be used at the same time. The steps toggle switch and the red buttons are inactive in CV mode. To limit the number of steps in CV mode you can use an attenuator to attenuate the CV down to only reach 2 or 3 steps.

 

Four separate switches: It's essentially four separate switches that is commonly controlled and shares ins and outs.

When I/O1 is connected to O/I1, I/O2 is connected to O/I2 and so on.

When I/O1 is connected to O/I2, I/O2 is connected to O/I3 and so on, and I/O4 is connected to O/I1.

When I/O1 is connected to O/I3, I/O2 is connected to O/I4 and I/O3 is connected to O/I1 and so on.

This routings can be seen in the pic below!

 

2/4/3 Steps and reverse direction: The toggle switch that controls number of steps works a little pequliar due to the CMOS CD4516 counter IC. Reset always takes it back to step 1/first LED lit. We could then choose to always let it reset on step 3 and 4 respectively for 2 and 3 steps.

 But when run in reverse it would mean that with the toggle switch on 2 steps it would go 2 steps before it hits step 3 and resets. All good so far but when 3 steps were selected it would just stay on step 1 when clocked in reverse as step 4 would be next and that would reset it. So we choose to let it reset on step 2 when you run it in reverse so it goes 1 -> 4 -> 3 -> 1.

 This opens up the possibility to clock forward and reverse with different triggers or button presses and therefore make it go in controlled irregular patterns. 1 -> FWD -> 2 -> FWD -> 3 -> REV -> 1 -> REV -> 4 -> REV -> 3-> FWD -> 1 as an example. Add a little random trigs or button presses and it will be less controlled.

 

Two parallel 1:2 switches: You could also patch it like two commonly controlled parallel 1:2 switches if you only run it in one direction. Easiest is forward direction: I/O1 : O/I1 & O/I2 respectively I/O3 : O/I3 & O/I4

 

You can download the building instructions via our info page.