A full kit containing all parts to build the unit shown in photographs. The Axoloti core board can be provided optionally. You just need to provide the tools, solder, computer and USB power supply! (An iphone/android USB charger works great)

Tom Whitwell from Music Thing Modular writes:

Axoloti is a very nice €65 audio board from Belgium, the closest thing I’ve yet seen to an Audio Arduino; lots of easy analog ins and outs for pots and switches, enough power to do interesting audio, and a nice visual patching system. A bit like a Nord Modular for 2016.

I’ve put together a simple control surface for my Axoloti; pots, buttons, LEDs and a joystick.

The BOM and PCB files (with a link to OSHPark to buy the PCBs direct) is here on Github: Axoloti Control Board.

It is all CC-BY-SA licensed so feel free to make and sell boards, so long as you credit me (Tom Whitwell / Music Thing Modular) and share any changes/improvements you make to the design.

Here’s a demo video showing a little Echophon/pitch shift patch – it can also happily play the .raw files from the Music Thing SD card.

View more videos here.

Axocontrol BUILD DOCUMENTS and test patch

https://www.thonk.co.uk/documents/axocontrol/

https://github.com/TomWhitwell/Axo-control

Axoloti general info

Sketching digital audio algorithms with the musical playability of standalone hardware.

The Axoloti Patcher offers a “patcher” environment similar to Max/MSP, Pure Data or Reaktor.

The patches run on a standalone powerful microcontroller board : Axoloti Core.

Check some examples of what it is up to.

Visit or join the community forum.

Current source code is on GitHub, latest release can be found here.

A kit for a Eurorack passive triple attenuator module (4hp).

A very simple and very useful Eurorack DIY kit. Below you’ll find links to very thorough build instructions written with synth DIY beginners in mind. This module requires no power from your busboard or prior electronic knowledge, it’s completely passive.

Each of the three attenuverters can be set to either a linear or logarithmic response with a jumper on the back of the PCB. Linear is more user friendly for CV attenuation, Log for audio signal attenuation.

Build time: 20-60 mins depending on experience.

Everything is included to make and rack the pictured module, even the solder. You just need a soldering iron and a pair of side cutters to finish the build.

• Panel – 4hp – Anodised Aluminium with industrial Alu-Print legend
• Knobs – Davies 1900h clones
• Alpha 9mm pots
• Thonkiconn jacks
• Solder (a generous amounts for beginners)

Build Documentation

https://thonk.co.uk/documents/at-at-at/

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.

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

More information

Manual

Assembly guide

THIS IS A FULL DIY KIT

This module is performing real-time LPC synthesis to produce intelligible voice or … not if you choose to.

The module produces sounds in 3 major modes: Speech, Repeat and VCO.
In Speech mode, the speech starts with a gate signal and complete before waiting for a new gate signal. The speech has the priority.

In Speech mode, the speech starts with a gate signal and complete before waiting for a new gate signal. The speech has the priority.

In Repeat mode, the speech starts and stops with the gate signal going high or low. The gate has the priority and the speech repeats while the gate is high. This mode is very useful to create crazy rhythms.

In VCO mode, the LPC engine loops while the gate is high, producing steady notes. The VCO mode can also produce sound using white noise instead of tones, making strange throat sounds.

The sound synthesis can be altered via CV signals to affect pitch, speed, bending.

Talko is an Arduino-based synthesizer developed under open-source hardware and software.
Its firmware can be updated via the onboard USB port.
The module can be powered via USB if needed.

The PCB has a breakout section connected to 4 of the ATmega328p free pins for hacking (included A4 & A5 for the I2C bus)

Technical details

• Format: Eurorack
• Width: 10hp
• Depth: 30 mm skiff friendly
• Power: + 12V: 65ma . Talko can also be powered via USB when using a jumper.  audio: un-filtered 5V PWM carrier at 62500 Hz, the output is protected against over or under voltage by clipping from 0 to +5V
• Inputs: protected against over or under voltage by clipping from 0 to +5V
• CV attenuators potentiometer on each CV entry

Banks

Talko can process 14 sound banks or functions:

0: Digits (from 0 to 9) male voice
1: Digits (from 0 to 9) female voice
2: Spell the Alphabet
3: Nato alphabet
4: Vocabulary
5: Big numbers
6: Voltmeter (reading the CV voltage)
7: Frequency meter (just saying “Hertz” instead of “Volts”)
8: Counter (each gate trigger increments the counter while any cv change on the Sound entry resets it)
9: Number radio (each gate trigger a 4 number sequence while any change on the Sound entry  trigger a new “transmission”)
10: Timer since cv reset (each gate triggers saying the time in minutes/seconds while any cv change  on the Sound entry resets the clock to zero)
11: Random vocabulary (60 words, see manual for details)
12: Sentences (12 sentences, see manual for details)
13: French Vowels “a e i o u”
14: French Digits (from 0 to 9) male voice

This module is performing real-time LPC synthesis to produce intelligible voice or … not if you choose to.

The module produces sounds in 3 major modes : Speech, Repeat and VCO.

Talko is an Arduino-based synthesiser developed under open-source hardware and software. (license CC-BY-SA)

Its firmware can be updated via the onboard USB port.

Please note that building & coding this module requires minimum Arduino knowledge like installing a com port, installing libraries & uploading code.

Assembly

The kit contains everything you need to build your own Talko 1.2 : the panel, the PCB, the components, the knobs and the power cable.

The kits include  a populated PCB with all SMD installed .

The bootloader is already flashed to the ATmega338p.

The assembly manual can be found here : https://github.com/deladriere/euro-modules/wiki/Assemble-Talko

User Manual

The user manual can be found here : http://www.polaxis.be/wp-content/uploads/2016/05/Talko-Manual-1_2.pdf

Technical support

https://github.com/deladriere/euro-modules/tree/master/Talko

This kit includes everything you need to build a fully functioning expansion module apart from the tools and solder. Comes with 12hp Aluminium Eurorack panel.

Thonk build documentation is here – http://www.thonk.co.uk/Documents/Turing/expanders/

Music Thing Modular documentation is here – http://musicthing.co.uk/modular/?page_id=323

This module is compatible with all versions of the Turing Machine. With the older Mki Turing Machine the Backpack module is also required.

This is a very simple to build chaos module that can be built in 2 ways: slow or VERY slow. Slow means 1 cycle every 15 seconds, VERY slow is 1 cycle every 15 minutes. It can take up to an hour for any change to be apparent when tweaking the pot. This module is ideal for ambience and extremely patient synth users. I developed it as I like to have my synths running whilst soldering away in the workshop and I like slow never-repeating changes to the patches.

The PCB is 16 x 95 mm

The super slow version shown below has two 1000uF caps.

BOM and Schematic – http://www.sdiy.org/pinky/data/SLOTH%20chaos%20WAMOD.pdf

Muffwiggler Thread – https://www.muffwiggler.com/forum/viewtopic.php?t=135563

“These are nice. The inputs can be any signal crossing 1V. The logic outputs give 5V gates that are all related to each other as made up of different input combinations. The S&H input can be a trigger, gate or CV. The stepped and slewed outputs an be very similar to what comes out of the Sauce of Unce or Buchla 265 SOU. The ICs are all thru-hole, resistors can be 1206 or 0805 smd. Pretty easy build, has 4 LEDs for blinkenlights.
Using different logic chips gives you some pretty different behaviour so it is worth having more than one of these. The XOR/XNOR chips cn be used as crude ring modulators at audio frequencies.

This is a great module for just patching in any spare outputs from LFOs, sequencers, ADSRs, etc and generating a whole bunch of gates and CVs that are sync’d with everything else going on in your patch.”

This kit includes everything you need to build the Mkii version of the Turing Machine. You just need to provide the tools and solder. Comes with 1ohp Aluminium Eurorack panel.

Since it was launched in June 2012, the Turing Machine has become one of the most popular Eurorack DIY projects. It is a random looping sequencer that spits out basslines and melodies. It generates strings of random voltages that can be locked into looping sequences. These sequences can be allowed to slip, changing gradually over time. This module was inspired by the long history of shift register pseudorandom synth circuits, including the Triadex Muse, Buchla 266 Source of Uncertainly and Grant Richter’s Noisering.

The 2016 revised Turing Machine has many improvements:

• Rotary loop length switch
• Pulse out
• Two boards, includes Backpack circuit to drive expanders (compatible with old Music Thing expanders)
• Easier to build: a larger PCB in the same width, clock and noise circuits are more robust
• Noise level trimmer & reduced voltage in noise circuit to make circuit more robust with different noise transistors
• Compatible with existing expanders (Pulses, Voltages, Vactrol Mix) but not the BYTES expander.

“I am interested in perceptible processes. I want to be able to hear the process happening throughout the music.To facilitate closely detailed listening a musical process should happen extremely gradually.” Steve Reich, Music as a Gradual Process, 1968.

Power – 40ma +12v, 0ma -12v

Depth – 33mm

Width – 10hp

Modular Grid – https://www.modulargrid.net/e/music-thing-modular-turing-machine-mk-ii

Build Document – https://thonk.co.uk/documents/turing2016/

Technical support and info – https://github.com/TomWhitwell/TuringMachine

Three extremely useful little synth utility PCBs for DIYers

• LED Driver (strip of 11 pieces) – CGSLD – Info, BOM etc.
• NEW! – Real Ring Modulator- CGSRR – Info, BOM etc
• NEW! – Psycho LFO – CGS03 – Info, BOM etc
• D.C. Mixer – CGS04 – Info, BOM etc
• Gate To Trig – CGS24 –Info, BOM etc
• NEW! – Serge Wave Multiplier – CGS29 – Info, BOM etc
• NEW! – Steiner Synthacon VCF – CGS35 – Info, BOM etc
• NEW! – Serge ’73 VCF – CGS77 – Info, BOM etc
• NEW! – Serge DUSG – CGS114 –  Info, BOM etc

A full kit to build the VACTROL MIX expander for the Turing Machine MK i and MK ii. This module will not function without a Turing Machine attached.

You cannot connect this to a Turing Machine MK I without a BACKPACK kit! You may need to up-rate your backpack positive rail fuse to support Vactrol Mix, Pulses AND Voltages expanders.

This kit includes everything you need to build a fully functioning expansion module apart from the tools and solder.

Thonk build documentation is here – http://www.thonk.co.uk/Documents/Turing/expanders/

Music Thing Modular documentation is here – https://github.com/TomWhitwell/TuringMixExpander

• Front panel (Aluminium 10hp)
  • VACTROL MIX
• PCB (Blue, gold plated traces)
  • VACTROL MIX
• All electronic components required.
• All mechanical components, pots (metal shaft), jacks, headers etc.
• Ribbon cable for connection to BACKPACK module.
• Black Davies 1900h clone knobs
• Rack screws

This module does nothing unless attached to a Turing Machine and BACKPACK module. They are compatible with all versions of the Turing Machine, past and future.

This product is sold under our standard Terms and Conditions.

Non Linear circuits are responsible for some of the most original and truly forward thinking analog designs for modular synths in the past few years. Andrew the designer describes it thus:

Because we are making so many designs available for sale in one go we are not able to immediately describe each project in detail here on Thonk, so for now please consider the research into what each module does as part of the DO IT YOURSELF with some little help from these links below

For module descriptions go here – http://nonlinearcircuits.blogspot.co.uk/2013/11/pcbs-for-sale-updated-9-nov-2013.html

For all BOM’s, schematics and build information go here – http://www.sdiy.org/pinky/data/data.html

There are many build threads for help and information on Muffwiggler, this is a good place to start – https://www.muffwiggler.com/forum/viewtopic.php?t=154469

Some of the more complex designs are not recommended for beginners, we’d recommend SLOTH if you’ve never tackled SMD components and BOOLs if you’re looking to develop your SMD skills.

V2.1 PCB set, one minor fix – some users had found the switch a little tight to fit.

This is a full kit which includes every single component to build a Radio Music module right down to the Teensy microprocessor board, the knobs, rack screws and power cable.

NOTE – you need to purchase a MicroSD card and a Micro-B USB Cable elsewhere to set up this module. The Micro-B cables are the smallest type shipped with Kindles and many Android phones. You also need a card reader to write files to the SD card, many laptops and desktops already have them built in now. – Read the setup and build documentation here.

The very cheap $2 MicroSD cards are not worth the trouble they will cause you, buy genuine SanDisk or Kingston branded MicroSD cards from Amazon or elsewhere. 32Gb maximum… that’s 108 hours of lossless audio in 16bit 44.1khz. Total file limit per card is 1200 files.

Full project details and documentation here – http://github.com/TomWhitwell/RadioMusic/

A little PCB to allow anyone to easily create Arduino based Eurorack projects. It has a power source with 5V regulator, all Arduino pins routed out to header pins, neatly organized. It’s also easy to use on a breadboard, now all you have to do is think about programming and design, not to wire up a power source and an Arduino all the time! Holes are included to securely attach it to any DIY project if needed.

Documentation – http://antumbra.eu/EURD_manual.pdf

Available in black only. These are genuine Davies Molding parts for 1/4″ or 6.35mm diameter pot shafts.

1913BW : Bold Large   (1.12" / 28.45mm diameter)

1910CS : Bold Small   (0.75" / 19.05mm diameter)

1600BM : Fine X-Large (1.50" / 38.10mm diameter)

1610AA : Fine Small   (0.91" / 23.02mm diameter)

The ‘Fine’ knobs were used on the original Buchla 100 and 200 series.
The ‘Fine Small’ knob was used on the Music Thing Modular Spring Reverb kit alongside 1900h knobs.

The ‘Bold’ knobs were both used on the Thonk 258J kits alongside 1900h knobs. The Bold Large knob is used on later revisions of the Turing Machine Sweeping Arcs Module. They are also used on the larger Manhattan Analog modules.

For full dimensions please view the Datasheets: 1913BW, 1910CS, 1600BM, 1610AA

Note we now carry the Rogan knobs that Greyscale sell here too.

Grayscale panels are 1.6mm thick anodized aluminum Metalphoto panels.

These PT range knobs are made in the USA by Rogan, they are not official Mutable Instruments or Make Noise products, but are the same style from the same factory..

• PT-1PS: small white pointer knob (all knobs on Branches, Shades, Shelves, Streams, etc)
• PT-2S: medium black encoder knob, no pointer (medium, i.e. Braids encoder knob)
• PT-2PS (D-shaft): medium white pointer knob (i.e. Braids knobs, Frames top row, etc)
• PT-3PS: large white pointer knob (i.e. big knobs on Clouds, Elements, Tides, etc)

Refer to the Rogan data sheet Rogan to check dimensions and other information.

Please NOTE: You remove existing knobs from your modules at your own risk, don’t force them! Also please check what shaft types you need first BEFORE ordering. Module manufacturers do not always consistently use a certain shaft type, they may change between D or T18 for example.

CHAOS DIVIDER HV Eurorack Clock Modulator Module

A video posted by Cory Sterling (@redstripedown) on Jul 5, 2016 at 2:08pm PDT

A clock signal. A serial chain of pulses. Some wide, some narrow. Some pulses are taller than others. Others, not so much. A clock may not the most exciting signal that gets passed around a modular synth, but it is certainly a useful signal. Take that clock pulse and pass it back out. But maybe instead of high fidelity, you drop every other pulse. Or maybe every third, or fifth, or eighth. By dividing your clock train, you can run an entire “drum set” of modules with one input and many outputs. But what happens when you add unpredictability, chaos if you will, to a normally pedestrian module? You get a CV controllable, multi-divisor, revolutionary clock modulator we call the CHAOS DIVIDER HV.

It is easy to be distracted by the glow of the Mode indicating Nixie tube (HV means HIGH VOLTAGE), this is a hard module to miss. But look past the neon beauty, and you will see a module with brains too. Front panel or CV selectable divisor mode, 9 outputs (inverted or normal outputs selectable with front panel toggle switch), division reset via push-button or trigger/gate input, and front panel and CV controls for Intensity and Interval chaos variables. Oh, and a clock signal.

The Mode control lets you select the divisor sequence from the list displayed to the left of the Nixie tube. In CHAOS mode, the divisors change at random according to the Intensity and Interval chaos variable selectors. The Intensity variable changes the range of the randomly selected divisor and the Interval variable changes how often divisors are recalculated. In non-CHAOS mode, the Interval variable introduces slip (or delay) to the outputs. This causes the outputs to be delayed from the incoming clock signal. Similarly, in non-CHAOS mode, the Intensity variable selects whether the slip applied to all outputs is the same (low Intensity) or varies across the outputs (high Intensity).

A few technical details: CV input allowable range is 0-10VDC. Anything over 10VDC is limited to 10VDC. The output pulses can be individually configured from 5-10VDC with a twist of a trimpot. Front panel controls behave as an attenuator for CV inputs.

Add our expander module, the CHAOS DIVIDER SPUTNIK (by the way, Sputnik means “Companion” in Russian), and unleash all the features that make the CHAOS DIVIDER a clock modulator for the people, Comrade!

Technical Specifications:
– 129.4mm (5.095″) Front Panel Height (3U Eurorack format)
– 12HP Module Width
– 51mm Module Depth
– Power Consumption: +12V = 165mA, -12V = 0mA, +5V = 0mA

Front panel graphics were designed by the inimitable Hannes Pasqualini @ Papernoise

Build Document BOM etc. – http://tsyklon.com/prodsupport/chaos_divider_hv_diy_build_manual.pdf

The following parts are included in this partial DIY Kit:

Iungo is designed to bridge the worlds of modular synthesizers and MIDI controlled instruments. This module lets you create both monophonic and polyphonic sequences to play your MIDI gear, all controlled by your cv and gate generating modular system.

It has the following features:

• Stored MIDI data accessed via cv and gate inputs.
• Banks will store up to 16 notes and rests. Each note can have an independent MIDI channel.
• Each bank can also store 1 program change message.
• 5 memory locations to store patches. Each patch saves the data in all 5 banks plus the mode settings.
• “Chord” mode outputs all notes in a bank simultaneously when triggered.
• “Seq” mode outputs each note in a bank consecutively upon receiving a gate signal.
• “Poly Seq” mode runs all 5 banks in sequencer mode simultaneously.
• The length of each bank is independent, allowing for more complex sequences to be produced.
• Chords and sequences can be transposed via the MIDI input.
• Velocity of MIDI data is determined by the amplitude of the gate signal.
• “MIDI Clock” mode outputs a MIDI clock byte whenever the gate input goes high.
• The first clock pulse will also send a MIDI start message, MIDI stop is sent if there is no gate received for 1 second.
• The MIDI clock pulses can be shifted forwards or back by 1/8ths, 1/16ths or individual clock pulses.
• MIDI input and output via 2.5mm stereo jack to 5 pin DIN cables. The same format adopted by iOS devices.

• Panel size 6HP
• Module depth 41mm
• Maximum current consumption 59mA on +12V

For more detailed information please refer to the Manual – http://entrospec.co.uk/

Entrospec have provided a simple build doc for this module, it’s a quick build although we don’t recommend it for complete beginners – https://www.thonk.co.uk/wp-content/uploads/2016/07/Iungo-Build.pdf

User manual and module information – http://entrospec.co.uk/

• Gildan Premium Cotton Ring Spun T-Shirt
• ‘Sports Grey’ Colour
• Screenprinted on front.
• Printed in Wales, UK
• Custom Thonk nape print
• Custom Thonk sleeve tag
• Fabric 100% ring-spun Cotton pre-shrunk jersey knit
• Weight 185g/m² (180g/m² White)
• 2,2cm collar
• Taped neck and shoulders
• Twin needle sleeve and bottom hems
• Quarter-turned to eliminate centre crease

Refunds and returns on clothing products are only available within the UK – Clothing must be returned within 2 weeks of purchase – Clothing must be returned unopened unless there is a discrepancy in the label size and actual size. See Terms & Conditions for returns process.

These PCBs are all Peter Blasser/Ciat Lonbarde designs which have been put to new PCB layouts by Meng Qi. Please note these are not beginner projects, all the information we have available is listed below or simply what is printed on the PCBs so please read before you purchase. We’re not providing technical support on these boards. Ciat Lonbarde have very active user communities, we have linked to those at the bottom of this page.

ROLLZ5

The Rollz-5 is at heart a drum machine, but one capable of drones and other weird effects. This unique machine is not driven by a step sequencer, but instead utilizes geometric rolls (and connections among them) to generate unruly polyrhythms.

Originally designed by Peter Blasser from Ciat-Lonbarde, this PCB has been laid out by Meng Qi.

Read more here.

BOM and build thread here.

NAMASITAR

Stylophone style instrument that enables “press barre” style playing similar to sidrassi and tetrazzi.

Also with external piezo input for processing other instruments.

Originally designed by Peter Blasser from Ciat-Lonbarde, this PCB has been laid out by Meng Qi.

A BOM is not provided by Meng QI, there is a thread on the muffwiggler board here and also you can check the Ciat Lonbarde Facebook group here, or contact Meng Qi for direct support here.

DIN DATIN DUDERO 2

Peter Blasser writes:

What you see here is a dronal, touchable, and diverse instrument modeled after the action of the Din Datin Dudero, a one-off I made to achieve electronic drones of a sophisticated nature. It has a touchable array of 16 brass nodes; 4 of which (Brando Nodes) have the capability when touched to shift the entire instrument into completely new dimensions of droning. Over the years I have been told what would be the ultimate electronic texture generator and this is it:

-two knobs that are big to get fine tuning

-a small but potent forest of touch nodes

-stereo output, with two speakers as monitors, and a volume knob for each channel.

-low battery drain-an easy path to dronal stasis with the possibility for sophistication.

Muffwiggler thread – https://www.muffwiggler.com/forum/viewtopic.php?t=58666

ACPS – Aluminum Phosphate Crystal Simulator

Meng Qi says:

One of my favorite Ciat-Lonbarde Design. 

Synth esque tone with a comfortable amount of harsh feel, LOTs of modulation and variations, a certain amount of randomness with my light sensor and filter mod = almost perfect. 

FURTHER READING

Ciat Lonbarde Yahoo Group – https://groups.yahoo.com/neo/groups/nabra-users/info

Ciat Lonbarde Website – http://ciat-lonbarde.net/paper/

Ciat Lonbarde Muffwiggler group – https://www.muffwiggler.com/forum/viewforum.php?f=65

Ciat Lonbarde Facebook group – https://www.facebook.com/groups/375204516010351/