DIY Kits

This is a high quality single channel voltage controlled amplifier designed around an all discrete transistor core. It is based on the 4019 sub-module which is found in the classic 2600 semi-modular synthesiser. Two signal inputs are provided, one DC...

The Oakley SVF is a 10HP wide two stage multimode filter module capable of high pass, low pass, band pass and notch output modes. All four outputs are available simultaneously. The module is a stand alone version of the filter in the Oakley ASV 5U module...

The 6HP Oakley Sound MOSPhaser is a six-stage, 1970s-inspired phaser featuring five variable all-pass filter stages that utilize a single 4009UBM CMOS IC for simplified, matched-component construction [1]. It features an internal triangle-wave LFO (0...

From the manufacturer: The Shaver Mystery 8hp This module contains two BBD based Flanger circuits. One is set by a pot, the other is voltage controlled (or just set by a pot). The intention is to create a thru-0 effect as the voltage controlled Flanger...

The 8HP wide Oakley Sound Human Voice Module (HVM) is an all analogue audio signal modification unit that replicates some of the sounds made from a classic electronic keyboard first seen and heard in 1979. The VP-330 is often thought of as a string...

The 10HP wide Oakley Croglin Voltage Controlled Filter (VCF) is based around two low noise ‘Sallen-Key’ filter circuits that operate either together or against each other. The cut off frequency of both filters, named A and B, can be...

This is a 10HP wide four pole multimode filter module capable of -24dB/octave low pass, -12dB/octave low pass and +/-6dB/octave bandpass outputs simultaneously. The filter core is based on four identical cascaded current controlled integrators. This is...

The 14HP wide Oakley Dual VCO, or DVCO, is two traditional sawtooth core voltage controlled oscillators in one module sharing a single common 1V/octave input. Each oscillator features a sawtooth (falling ramp) and variable width pulse wave output. VCO2...

The 6HP wide Oakley Envelope is an easy to use four stage envelope generator with switchable looping mode. The ADSR is operated by a traditional gate signal, but can also be triggered by slow rising CVs too due to the built in schmitt trigger function...

The 6HP wide Oakley Classic VCA is a new version of one of my first Eurorack modules. This is a voltage controlled amplifier module inspired in part by a classic vintage design, the ARP4019 sub-module which was used on the wooden case ARP2600P...

The 6HP wide Oakley Sound Eurorack Multimix is highly useful mixer module that can be used to process both control voltages (CVs) and audio. It is based on the original ‘Stooge’ version of the Oakley Multimix for 5U. The unit features three...

From the manufacturer: The AI028 Voltage Controlled Matrix Mixer is a 6-input, 6-output Matrix Mixer, with 36 VCAs to control how much each input is fed to each output (0-5V). The Module can distribute audio and/or control voltage, and has a dedicated 5V...

AI026 Line I/O Interface  The AI026 Eurorack Line Interface converts between +/- 2V Line Signals and +/- 5V Eurorack signals. This allows for the best headroom and highest quality when processing Line signals with Eurorack modules, and vice...

Nonlinearcircuits Sloth Chaos This is the original Sloth with aluminum Clarke68 panels. For the NLC version or the bare PCB, see here. For the triple C68 panel, see here. There are three kit options available- each offers a different set of two very slow...

Nonlinearcircuits Sloth Chaos This is the original Sloth Chaos PCB. Although the NLC panels read ‘Torpor’ the PCB can be built to use any of the three speed options.  For other label options, see the C68 panel version. There are three...

4HP Neuron Description/Usage 4hp This module is a 4HP version of the NLC 8HP Neuron & Difference Rectifier. The differences are half the panel real estate, SMD components, LEDs to indicate activity and one less input on the Neuron (2 instead of 3)...

From the manufacturer: DACTROL Description/Usage 4hp This is a design by Tom Hirst (who also designed the NLC Snake Joke module). His description for the design is: “It's a vactrol-based multiplying-DAC (digital to analog converter). It basically...

From the manufacturer: Bulbous Also Tapered VCF 8hp This module uses two SSI2140 chips, one as a 4 pole high pass filter, the other as a 4 pole low pass filter. Both sections have voltage controlled cutoff and Q. The output of the high pass stage is fed...

Two flavours of noise, one is pretty standard transistor white noise and the other isn't really noise but a buzzy mix of 6x 40106 oscillators mixed together. Both make good starting points for percussion sounds and each has their own crude VCA...

This is a simple AD or AR envelope generator with a handful of novel extras tacked on. There are two main envelopes with manual control over rise and fall times (sorry, no voltage-controlled rise or fall), two slightly more interesting envelopes derived...

From the manufacturer: 8-channel rising edge detector aka gate-to-trigger converter. Also has OR-combined outputs for ODD, EVEN, and ALL channels, 'enable' inputs for gating/muting the OR-combined outputs, and input normalisation scheme for generating...

From the manufacturer: 8-channel rising edge detector aka gate-to-trigger converter. Also has OR-combined outputs for ODD, EVEN, and ALL channels, 'enable' inputs for gating/muting the OR-combined outputs, and input normalisation scheme for generating...

IMMIX Description/Usage 6hp This module is based around the SSI2190 6 stage VCA/Mixer. The unusual part is both the inverting and non-inverting inputs of the VCA stages are used, I wanted to muck around with sending the same signal to – and +...