The Oakley Modular Analogue Synthesiser

Welcome to the Oakley Modular page, home of Tony Allgood's Oakley Modular System since 1999. Oakley modules can be be bought either as a ready made units from our partner business, or can be constructed by yourself using our high quality bare printed circuit boards. Full building instructions can be found on each of the project's own webpage.

Our full size modules are primarily designed for the 5U module system as originally defined by the Synthtech MOTM modular. As such they are fully compatible with MOTM and other MOTM compatible modules. Most of our module designs are also MU format compatible and are therefore suitable for fitting into systems. If you are building them yourself you can, with a bit of imagination, get them to work with the smaller formats too.

Our Compact 3U range is designed for Euro sized modulars and Fractional Rack systems. They are designed to work on either +/-12V or +/-15V.

For technical support on all Oakley projects please refer to the knowledgeable and helpful Oakley Sound Forum which is hosted at Tony Allgood at Oakley Sound Systems does not provide direct e-mail support for Oakley projects, but is usually available via the forum.

Ordering details for modules or DIY PCBs and parts can be found by clicking here. Some tips on buying which modules can be found in our Which Modules page.

The Modules


5U VCO Superb sounding and full featured oscillator for classic analogue power
5U Slim-VCO Single width oscillator
5U VC-LFO Voltage controlled audio and low frequency oscillator
5U VCO controller Master control over VCO pairs with onboard vibrato LFO
5U Dual-LFO Two versatile low frequency oscillators in one single width module


5U COTA Multimode voltage controlled filter based on the classic cascaded integrator design
5U Croglin Dual filter with a very unusual topology
5U Diode Superladder Filter Discrete four stage diode ladder low pass and band pass filter
5U Discrete Ladder Filter The classic 904A filter revisited NEW
5U Journeyman Diode Ring Filter A discrete VCF full of character
5U State Variable Filter Two pole true multimode VCF
5U Transistor Superladder Filter Moog style low pass and band pass filter

Utility Modules

5U Comparator & Gate Delay Dual CV & Audio processor with gate delay feature
5U EFG Envelope Follower, Gate Extractor and Pre-amp in one.
5U Fourmix Simple but effective four channel audio and CV mixer.
5U midiDAC Single channel midi to CV convertor
5U MultiMix Versatile three way mixer for DC and audio
5U Noise/Filter Analogue noise and voltage controlled filter module
5U Sample/Slew Very useful sample and hold design with separate slew generator, clock generator and noise source
5U Versatile Ramp Generator Variable symmetry oscillator, slew, envelope generator, trigger delay and more


5U Dual and Quad VCAs A dual and quad voltage controlled amplifier module with mixing capabilitiess
5U Classic VCA Vintage voltage controlled amplifier based on the discrete circuitry of the 2600
3U Classic VCA Vintage VCA design for the Eurorack modular


5U Equinoxe Voltage controlled phaser
5U Deep Equinoxe Voltage controlled eight stage phaser
5U Discontinuity Waveshaper, wavefolder, ring modulator, wave splicer, clipper and rectifier module
3U Overdrive Make your Euro or Frac format modular scream with this overdrive and distortion unit
5U Overdrive-II A well featured Overdrive and Harmonic Multiplier module
3U 4014 Ring Modulator A pedigree ring modulator for the Euro sized modular
5U 4014 Ring Modulator Classic ring modulator circuit with a vintage pedigree

Envelope Generators

5U ADSR/VCA A looping ADSR envelope generator and VCA in one
5U VC-ADSR Fully voltage controlled looping ADSR and VCA
5U Versatile Ramp Generator Variable symmetry oscillator, slew, envelope generator, trigger delay and more

Power Supplies

5U Power Supply Power supply module for small to medium sized MOTM systems
5U Dizzy Power distribution board for the MOTM format

3U Euro power Supply Power supply module for small to medium sized eurorack systems
3U E-Dizzy Power distribution board for eurorack.

Useful Information

Which Modules Some tips on buying which modules for your modular
Construction Guide Our handy PDF guide to building Oakley DIY projects
Parts Guide Our handy PDF guide to buying parts for Oakley DIY projects
Power Supplies Information about sourcing power supplies

US Part Numbers

A very generous US builder of Oakley modular projects has compiled a set of very useful parts lists complete with Mouser and other suppliers' part numbers. 25 modules have had all their parts placed into individual spreadsheets. The .xls files have been bundled as one small ZIP file and can be downloaded here.

Legacy Support

Legacy Support Page A growing collection of older User Guides, User Manuals and Builder's Guides

An example of a small but powerful Oakley 5U modular system built into a 22U wide oak case. The frontplates are standard black finish Schaeffer engraved panels.

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Copyright: Tony Allgood.
Last revised: September 16, 2016.