The London Drive is a 4HP Drive/Distortion module inspired by the prestigious EMS VCS3/Synthi input gain. London Drive has two inputs and two outputs. Output 2 is a reverse phase version of Output 1, with a slightly different sonic character as well. Unlike its sibling Mini Drive,  the London Drive gain knob never goes completely silent, but instead ranges from a clean signal to warmly overdriven. The module works as a gritty drive for modular level signals and works well with line level inputs as well – like a drum machine. It’s not suited as an external input for guitar.

Using this module is a great way to make a polite sound source into something less polite, but always experiment with the levels! – the output can sound completely different depending on the settings and it can also be used to just add a nice bit of warmth to your input. London Drive also works very well with feedback loops – the dual inputs and differently phased outputs are designed to encourage experimentation with feedback patching.

While this module doesn’t have CV in, you can either put a VCA or a filter before to modify the amount of grime, or get more experimental and try blasting an LFO or a sequence into one input to see what it does to audio in the other input.

Power 39 mA

Width 4 HP

Depth 25 mm

A great quick and easy kit for DIY beginners! All surface mount parts come pre-soldered.

Build guide can be found here.

DIY level: easy.

The Twin Drive is a 4HP Drive/Distortion module inspired by the classic Minimoog input gain. Twin Drive  is a stereo version of the Mini Drive, with  left and right inputs – the left input is normalled to both outputs so the module can be used with mono signals as well. The Drive knob goes from zero/silent to lots of gain. It’s a dirty gain for modular level and works well with line level inputs – like a drum machine. It’s not suited as an external input for guitar.

Using this module is a great way to make a polite sound source into something less polite, but always experiment with the levels! – the output can sound completely different depending on the settings and it can also be used to just add a nice bit of warmth to your input.

While it doesn’t have CV in you can either put a VCA or a filter before to modify the amount of grime, or get more experimental and try blasting an LFO or a sequence into one input to see what it does to audio in the other input.

Power 82mA @+12V, 6mA @+12V

Width 4 HP

Depth 25 mm

A great quick and easy kit for DIY beginners! All surface mount parts come pre-soldered.

Build guide can be found here.

DIY level: easy.

The Mini Drive is a 4HP Drive/Distortion module inspired by the classic Minimoog input gain.

Mini Drive has two inputs which are higher and lower gain - but if you use both they’re the same level mixed. The Drive knob goes from zero/silent to lots of gain. It’s a dirty gain for modular level and works well with line level inputs – like a drum machine. It’s not suited as an external input for guitar.

Using this module is a great way to make a polite sound source into something less polite, but always experiment with the levels! - the output can sound completely different depending on the settings and it can also be used to just add a nice bit of warmth to your input.

Mini Drive also works very well in feedback loops. The classic minimoog trick is taking the audio output and adding it back after the oscillators, before the filter through this circuit. So the filter is in a feedback loop which will add resonance and fuzz. If you patch one output directly to an input then you can achieve feedback tones. Another idea is to patch sound (radio music, or a Osc/env/filt voice) into ‘low’ and one output to the main out. Then patch the second out to a filter, or a delay or reverb, and the output from that back into ‘high’ then turn up and add what happens. If the feedback isn’t wild, invert it with an attenuverter before going back into high.

While it doesn’t have CV in you can either put a VCA or a filter before to modify the amount of grime, or get more experimental and try blasting an LFO or a sequence into one input to see what it does to audio in the other input. the outputs are passive multed together.

Power 39mA

Width 4 HP

Depth ?mm

A great quick and easy kit for DIY beginners! All surface mount parts come pre-soldered.

Build video can be found here. DIY level: easy.

Control is a 18hp Eurorack controller module designed to improve the ergonomics of a modular system. Control allows the user to provide precise but also creative manual control voltage over many elements at once.

Control has four big knobs that output voltages. Connect those voltages to modules, and you have high-precision, intuitive control. Connect those voltages to several modules, and you have interesting, repeatable confusion.

• The first two channels (top two knobs) are also attenuators if something is plugged into the leftmost sockets.

• The voltage on each channel can be adjusted via the switches: 0–5v (middle), 0–10v (up), or -5v to +5v (down). When using a channel as an attenuator, keep it in 0–5v or you’ll get weird gain or offset (which you may want).

• There are two extra outputs. The Change output will output just the changes as they happen. If a knob is turned quickly to the right, it will output a little burst of positive voltage. If a four-handed performer turns all four knobs quickly anti-clockwise, it will output a chunky pulse of negative voltage. Patching Change into an input creates a primitive clock.

• Diff is a difference rectifier, inspired by NonlinearCircuits, but with a slightly different circuit. It compares the difference between 1&2, and between 3&4, and will then finally output the difference between those two differences. The aim with this output is to create a bumpy, unpredictable positive only voltage between 0 and 10v. It’s not random, but it’s not easily predictable, either.

• Each knob has its own bi-colour LED to provide visual feedback on how much voltage is being output. There are also LED indicators for the Change and Diff outputs.

The circuit is a stack of LM324 op amps, and the pots are nice high quality TT Electronics P260T – as used in SynthTech modules and many 5U synths. They have steel shafts bolted to the front panel and they feel great.

Power 52mA @+12V, 39mA @-12V

Width 18 HP

Depth 24mm

All the surface mount components come pre-soldered in this kit, it’s just a case of soldering pots, jacks, switches, power header and LEDS. A good beginners project with a full video build document. Build video is here.

DIY level: easy.

Full DIY kit for a seven-band Eurorack Graphic EQ inspired by the classic Boss GE-7 pedal

A compact and high quality seven band graphic equaliser for Eurorack. Inspired by the Boss GE-7 pedal, but with pristine low-noise circuitry and a much broader frequency range. Push the faders up and to the left to boost, down and to the right to cut. Works great in feedback loops or as a tone control for individual voices. The kit comes with silver alu panel.

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

Chord Organ is a new firmware for the Music Thing Modular Radio Music module. It gives the module a completely different function. Instead of playing samples from the SD card, it synthesises chords. This is the full Chord Organ kit with dedicated Chord Organ silver alu panel and black button.

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. 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.

Chord organ now tracks 1v/Oct if you use the latest software downloaded here! http://polyfather.com/chord_organ

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

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. Silver alu panel and red button.

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. 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.

Download the latest software here – http://polyfather.com/radio_music

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

This kit contains all parts to build the module, right down to the power cable and the screws. These kits ship with a white knob (not black as shown in some older photos). Internal contact mic is included. External contact mic must be built or purchased separately (see below).

Tom Whitwell the designer of Mikrophonie describes the module thus: “Mikrophonie is a microphone preamp with a piezo contact mic built into the panel. It is an easy way to bring environmental noise and feedback into a modular system, inspired by the early days of electroacoustic music in Paris and Cologne, and by the contact microphone and phonograph cartridge experiments of John Cage, Gordon Mumma, Robert Ashley and Nicholas Collins. Here is a wonderful film from 1966 of Stockhausen & Co performing Mikrophonie 1. The panel is PCB with no soldermask. The raw PCB fibreglass has quite a nice rough texture – rubbing it with a finger or a plectrum creates quite a wide range of sounds. The back of the panel is plated and grounded for shielding; the peizo microphone can either be soldered directly to the copper or stuck on with epoxy glue.”

The module will work with both DIYed contact mics made from inexpensive piezo transducers or the more professional and fully shielded Exploding Shed contact microphone.

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

This is a full kit to build the module. It comes with one tapehead! You need an extra tape head to DIY a ‘wand’ as shown in this video. The Tapehead mounted into the module itself is of limited use compared to a wand. With a mono cassette head in the panel and a NAB equalised amplifier circuit, Magnetophon is a cassette player without the transport mechanism. Try rubbing old cassette tapes on the panel, or attach a head on a wire to recreate Nam June Paik’s Random Access or Laurie Anderson’s Tape-Bow Violin.

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

Startup is a headphone amp, six-input mixer, tap tempo clock, divider & multiplier in 4hp. It's the perfect way to start a small Eurorack case. Full DIY Kit.

Startup is designed to be the best way to start a small Eurorack case, featuring a Mixer, Clock & Headphone Amp. This is a really easy project for DIY newcomers, all the SMD components come pre-soldered and the PCB is programmed and testing prior to shipping. You just need to solder the buttons, jacks and pot. The Music Thing Modular ‘Startup’ is designed to be the best way to help start a small Eurorack case.

This 4HP module does three things:

1) It’s a 5 channel output mixer, with a spare channel for stereo signals (like a Korg Volca or a phone).

2) It’s a nice clean headphone amp with two outputs.

3) It’s a useful tap-tempo clock, with a second channel giving divided or multiplied clocks.

The best way to understand Startup is with with the Quick Start Manual.

This thing is super! See more backgound info and details on the Music Thing Website here. There are 2 instagram videos by Tom Whitwell here and here.

• Current draw: 40mA
• Width: 4 HP, Depth: 25mm

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

This is a full kit that includes everything you need to build a 6hp Eurorack module, except the spring tank or digital brick. The Music Thing Spring Reverb Mkii is a flexible, easy-to-build voltage controlled DIY mono spring reverb module. Traditional guitar reverbs are tuned to the sound of the guitar and the amplifier it is played through. This circuit is different; designed to be relatively clean and high-fi, with a lot of bass response. Use real spring reverb tanks, or solid state reverb bricks.

New Features of the Spring Reverb mk2 include:

-Internal Feedback control with CV input, dedicated attenuverter and with invert switch for maximum feedbackiness

-Wet out and feedback in sockets for more flexible patching

-3HP Expander – allows for instant switching between reverb brick and spring tank – or set a blend between the two

-Expander also allows for front panel send and return to spring tank.

-New improved circuit

More Features

-Works with a variety of spring reverb tanks (optional), or with the Accutronics BTDR-2 reverb ‘brick’ designed by Brian Neunaber (optional)

-Vactrol (VTL5C3) crossfade between dry and wet (vactrol circuits are variable in their ability to go completely 100% wet, like the Make Noise Echophon for example)

-Tilt EQ on the reverb send to tune the voice of the reverb

-X-Fade input so the module can also be used as a standalone vactrol crossfader (crossfade demo)

-Feedback circuit with positive and negative phase

-Attenuverter on the crossfade CV input

-6hp wide (NB: If using the brick, mounted horizontally, the brick extends 5mm over the PCB to the left of the module, around 25mm back from the front panel, so mount the reverb next to a shallow module)

-Expander with Front panel mount Phono sockets & Crossfade between reverb types.

More background infos can be found on the Music Thing website. Here is a DivKid Video about it and here is a build video by Markus Fuller.

We provide genuine Accutronics/Belton Spring Reverb Tanks separately. They produce high quality and springy responses! All reverb tanks include 1M RCA cable.

Medium – 8EB2C1B  Springs: 3, Delay Type: Medium, Tank Dimensions: 23.5 x 8.5 x 3.3cm, Input Impedance: 800 Ohms, Output Impedance: 2575 Ohms, Mounting: Horizontal Open Side Down, Connectors: Input Insulated – Output Grounded

Large – 9EB2C1B Springs: 3, Delay Type: Medium, Tank Dimensions: 42.5 x 12 x 3.3cm, Input Impedance: 800 Ohms, Output Impedance: 2575 Ohms, Mounting: Horizontal Open Side Down,

Connectors: Input Insulated – Output Grounded

Instead of the reverb tanks you can use a digital brick, which you can find at Banzai Music.

The passive Spring Expander adds phono sockets on a separate front panel plus adds a blend knob for brick/tank.

• Current draw: 75mA
• Width: 6 HP, Depth: 40mm

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

This full kit is great for learning SMD/Surface mount soldering. Build a super skiff friendly and great sounding EQ module. Music Thing have produced a new revision of this MTM board which includes a few through hole parts such as the electro caps to make this an easy way into surface mount soldering. It’s really not a hard kit if you’ve done a handful of through hole soldering projects previously. It includes a full and in-depth build doc for complete SMD beginners too. All parts are individually bagged and labelled and we’ve included extra parts for practice. More background infos can be found on the Music Thing website.

Simple EQ – Learn SMD soldering by building two channels of the kind of tone controls you’d find on an old hifi. No voltage control, but just enough range to push sounds into distortion. Works well in a feedback loop.

• Current draw: 20mA @+/-12V
• Width: 4 HP, Depth: 25mm

Building instructions can be found here. DIY level: easy/medium. SMD soldering is not recommended for complete beginners! Make sure your soldering iron has a good fine tip before attempting this build. A flux pen is also recommended.

Random Looping Sequencer

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 10 HP 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.

Background infos can be found on the Music Thing website. Here's a DivKid video about it. Technical support and info via Github.

• Current draw: 40mA @+12V
• Width: 10 HP, Depth: 33mm

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

Turing Machine Expander VOLTS Kit

This kit includes everything you need to build a fully functioning expansion module apart from the tools and solder. Comes with 4hp Aluminium Eurorack panel. This module is compatible with all versions of the Turing Machine. With the older Mk1 Turing Machine the Backpack module is also required. Multiple VOLTS modules can be daisy-chained on a single Turing Machine to give a ‘polyphonic’ CV output.

Background infos can be found on the Music Thing website.

• Current draw: 0mA
• Width: 4 HP, Depth: 25mm

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

Turing Machine Expander PULSES mk2 Kit

This kit includes everything you need to build a fully functioning Pulses MK2 expansion module apart from the tools and solder. This module is compatible with all versions of the Turing Machine. With the older Mk1 Turing Machine the Backpack module is also required.

Check out the Molten Modular build video! Background infos can be found on the Music Thing website and here.

• Current draw: 20mA
• Width: 4 HP, Depth: 25mm

Building instructions can be found here. DIY level: easy but requires some simple SMD soldering.

Turing Machine Expander VOLTAGES Kit

This kit includes everything you need to build a fully functioning Voltages expansion module apart from the tools and solder. This module is compatible with all versions of the Turing Machine. With the older Mk1 Turing Machine the Backpack module is also required.

Check out the background infos on the Music Thing website.

• Current draw: 40mA
• Width: 12 HP
• Depth: 25mm

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

Turing Machine Expander VACTROL MIX Kit

A full kit to build the VACTROL MIX expander for the Turing Machine MK1 and MK2. This module will not function without a Turing Machine attached. Vactrol Mix combines four audio or CV signals into two channels, determined by the random sequence. It’s a great way to create stereo effects, complex waveforms or feedback loops.

Check out the background infos on the Music Thing website.

• Current draw: 40mA
• Width: 10 HP
• Depth: 35mm

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