Eurorack Projects
Oakley Sound Analogue Sequencer
The Oakley Sound Sequencer is a 50HP wide eurorack analogue sequencer with a maximum of eight steps and multistage loading capability. Each step can be selected to reset the sequence back to the start,…
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Classic VCA – Discrete core voltage controlled amplifier
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…
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Dual VCO – Two classic sawtooth core oscillators
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…
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The Discrete Ladder Filter Module
The Oakley Discrete Ladder Filter (DLF) is my reworking of the classic 1960's low pass filter module. Inspired by the circuits of the 904A filter and CP3 mixer, the DLF combines them into one…
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MOSPhaser: Voltage Controlled Phaser Module
The 6HP wide Oakley Sound MOSPhaser is a six stage phaser (five variable all pass filters and one fixed all pass filter) that generates a classic sound. Partly based on a well loved 1970s…
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COTA – Voltage Controlled ‘Cascaded OTA’ Filter
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…
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HVM – Human Voice Module
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…
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Croglin – Voltage Controlled Dual Filter
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…
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Journeyman – Classic Diode Ring Filter
This is a 6HP wide four pole dual mode filter module capable of either -12dB/octave low pass or -6dB/octave high pass responses. The Journeyman's unlinear quirky discrete circuitry gives it a unique sound of…
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SVF – Voltage Controlled State Variable Filter
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…
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Oakley Sound Multimix
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…
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Envelope – A Looping ADSR module for Eurorack
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…
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EPSU: Eurorack Power Supply Module
The issue 2.1 Oakley EPSU built with the linear option that uses a more traditional 78M05 to create the +5V rail. Note also the 0V bonding point and 0V connection to a 'grounding' 4mm…
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Euro Dizzy: Eurorack Power Distribution board
An earlier version of the issue 2 Euro Dizzy board. Newer issue 2 boards have green solder mask instead of red. This is a power distribution board supporting eight 16-way IDC headers and four…
View ProductOakley Eurorack projects are designed for builders: clear documentation, reliable analogue performance, and modules that hold their value in a real-world system.
Originally known for 5U/MU format modules, Oakley has also developed a strong presence in the Eurorack ecosystem, offering builders high-quality circuit designs with exceptional sound character and stability.
Sequencers
Utility Modules
Amplifiers
Envelope Generators
Oscillators
Power Distribution
A Focus on Analogue Excellence
Oakley Eurorack projects emphasize:
- Discrete analogue circuitry
- Stable voltage-controlled oscillators (VCOs)
- Musically voiced filters
- Clean, low-noise signal paths
- Thoughtful, performance-oriented layouts
Each module is designed with careful attention to tracking accuracy, thermal stability, and long-term reliability—making them ideal for both studio and live performance environments.
Core Eurorack Project
Voltage Controlled Oscillators (VCOs)
Oakley VCO designs are known for excellent 1V/oct tracking and rich analogue tone. Builders appreciate their calibration precision and stable tuning across wide frequency ranges.
Filters & Tone Shaping
From classic ladder-inspired filters to state-variable designs, Oakley filters deliver warmth, clarity, and dynamic resonance. Many designs are inspired by vintage circuits while incorporating modern refinements.
Utilities & Modulation
Oakley offers essential building blocks such as:
- VCAs
- Envelope generators
- LFOs
- Mixers
- Power regulation modules
These utilities are engineered to integrate seamlessly into complex Eurorack systems.
Why Choose Oakley Eurorack Projects?
- Proven analogue circuit designs
- Exceptional build documentation
- Boutique-level sound quality
- Strong DIY community support
- Long-term serviceability
For modular enthusiasts seeking reliable, great-sounding analogue modules with a classic engineering approach, Oakley Eurorack projects offer a compelling balance between vintage inspiration and modern precision.
Oakley Modular Euro Dual VCO Issue 2 Version
Oakley Euro Dual VCO NEW LOWER PRICES- 2026 Issue 2 PCB Version (Main PCB Issue 2.1, Pot PCB Issue 1.1) Oakley…
$19.00
Oakley Modular Euro Sequencer
Oakley Euro Sequencer NEW LOWER PRICES- 2026 Build documentation here: https://www.oakleysound.com/Sequencer%20Builder's%20Guide.pdf User Guide here: https://www.oakleysound.com/Sequencer%20User%20Manual.pdf Aluminum panel for eurorack based on Oakley Modular…
$39.00
Oakley Modular Euro Multimix
The 6HP wide Oakley Sound Eurorack Multimix is highly useful mixer module that can be used to process both control voltages (CVs)…
$30.00
Oakley Modular Euro Classic VCA (SMT 6HP)
The 6HP wide Oakley Classic VCA is a new version of one of my first Eurorack modules. This is a voltage controlled…
$30.00
Oakley Modular Euro Envelope ADSR
The 6HP wide Oakley Envelope is an easy to use four stage envelope generator with switchable looping mode. The ADSR is operated…
$30.00
Oakley Modular Euro Dual VCO
The 14HP wide Oakley Dual VCO, or DVCO, is two traditional sawtooth core voltage controlled oscillators in one module sharing a single…
$30.00
Oakley Modular Euro COTA – VC ‘Cascaded OTA’ Filter
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…
$30.00
Oakley Modular Euro Croglin – VC Dual Filter
The 10HP wide Oakley Croglin Voltage Controlled Filter (VCF) is based around two low noise ‘Sallen-Key’ filter circuits that operate either together…
$30.00
Oakley Modular Euro HVM – Human Voice Module
The 8HP wide Oakley Sound Human Voice Module (HVM) is an all analogue audio signal modification unit that replicates some of the…
$30.00
Oakley Modular Euro MOSPhaser
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…
$249.00
Oakley Modular Euro SVF (State Variable Filter)
The Oakley SVF is a 10HP wide two stage multimode filter module capable of high pass, low pass, band pass and notch…
$249.00
Oakley Modular Euro Analogue Sequencer
The Oakley Sound Sequencer is a 50HP wide eurorack analogue sequencer with a maximum of eight steps and multistage loading capability.
$249.00
Oakley Modular Euro Classic VCA (Thru-Hole 8HP)
This is a high quality single channel voltage controlled amplifier designed around an all discrete transistor core. It is based on the…
$30.00