Guru Gara Synth

A Eurorack PCB and front panel utility kit that distributes CV and audio signals via buffered outputs without voltage drop, functioning as a 1x8 or 2x4 active multiple.

A Eurorack PCB and front panel kit powered by the 4017 Decade Counter chip, offering multiple clock division options for creating rhythmic sequences and polyrhythms.

A DIY Eurorack PCB and front panel kit providing two independent envelope generators that shape the rising and falling edges of gate or trigger signals. It includes gate-to-trigger conversion and switched jack routing to trigger both envelopes from a single source.

A DIY Eurorack LFO PCB and front panel kit built around an OTA-based core, offering Square, Triangle, and Sine waveform outputs with voltage-controlled rate and a Ping input for trigger-based resets.

A DIY Eurorack polarizing mixer PCB and front panel kit that combines signals while accounting for phase, adding or subtracting voltage per channel. LED indicators show output polarity for monitoring signal behavior.

A 16HP Eurorack DIY module combining four independent voltage-controlled amplifiers with onboard stereo panning and mixing. Features individual and stereo/dual mono outputs, a CV Link switch, and per-channel pan controls.

A compact 4HP Eurorack full DIY kit featuring dual independent attenuverter channels with a symmetrical design. The top channel is normalled to an internal +5V reference, allowing it to function as a standalone CV generator sweeping from -5V to +5V when unpatched.

A classic DIY Eurorack modulation utility that samples an incoming signal on each clock pulse and holds that value, generating stepped control voltages. It includes a built-in white noise generator internally routed to the input, plus a buffered noise output and Depth control.

A compact 4HP Eurorack DIY summing mixer that blends five separate audio or CV channels into a single unified output. It features a 3-step gain switch to multiply output gain by 1, 0.5, or 0.2, useful for preventing clipping or attenuating to line-level.

A complete DIY Eurorack kit for a four-channel OTA-based voltage-controlled amplifier, with SMD components pre-assembled at the factory and only through-hole parts left to solder. It offers stereo pairing via normalled inputs/CV and a summed Mix Out.

A fully assembled four-channel OTA-based voltage-controlled amplifier for Eurorack designed for precision signal shaping and mixing. It features internal normalizations allowing use as two stereo pairs, plus a summed Mix Out for voltage-controlled mixing.

Discontinued

A discontinued Eurorack LFO PCB and front panel kit based on the classic 8038 analog function generator, since replaced by a new OTA-based LFO design.

A Eurorack PCB and front panel DIY kit for a voltage-controlled high-pass filter based on the CEM3320/AS3320 VCF chip.

A Eurorack PCB and front panel DIY kit for a voltage-controlled low-pass filter based on the CEM3320/AS3320 IC.

A Eurorack PCB and front panel DIY kit for a state variable voltage-controlled filter based on the 3350 IC, providing simultaneous low-pass, band-pass, and high-pass outputs with a built-in two-input mixer.

A standalone analog hardware high-pass filter for DJs and live performance, featuring a Resonance Link function that controls both frequency and resonance with a single knob.

A 100% analog dual stereo high-pass and low-pass filter unit housed in a 19-inch rack-mount format designed for DJ and live performance use. Its Resonance Link feature lets a single knob control both frequency and resonance across both filters.

A DIY Eurorack analog low-pass voltage-controlled filter inspired by the classic MS-20 filter topology, built around the LM13700 OTA with a 12dB/octave slope for warm, resonant filtering.

A fully assembled analog stereo low-pass filter for Eurorack with dedicated left and right audio inputs and outputs, and CV inputs for Frequency, Resonance, and Stereo Space. A mono signal patched into the left input only is automatically routed to both channels for stereo processing.

A DIY stereo analog low-pass filter for Eurorack with CV control over Frequency, Resonance, and Stereo Space, plus a signature Stereo Space fader for expressive stereo movement. The left input is internally linked to the right, allowing mono signals to be processed in stereo.

An aggressively resonant low-pass filter for Eurorack built around an OTA core, inspired by classic MS20 architecture, delivering thick low-end and screaming resonance. It ships ready to integrate into a system with mounting screws and a ribbon power cable included.

An all-analog multi-mode Eurorack VCF DIY kit built around a classic OTA (LM13700) design, providing simultaneous High-Pass, Band-Pass, and Low-Pass outputs from a single audio input. Two CV inputs with attenuators allow expressive modulation of the cutoff frequency.

A Eurorack PCB and front panel DIY kit for a 4-channel audio mixer with individual channel volume controls and a master volume.

An adjustable dual-rail power supply PCB for Eurorack and general audio electronics projects, designed to operate from an external AC transformer and generate regulated bipolar supply rails.

A compact, chainable power distribution PCB for Eurorack modular synthesizer systems that distributes power and control signals to multiple modules.

A hand-built Eurorack power supply and bus board delivering regulated +12V, -12V, and +5V rails with nine 16-pin power connectors for distributing power and control signals to modules.

A bare PCB for a 9-header Eurorack PSU and bus board designed to accept industry-standard encapsulated DC/DC converter modules, providing +12V, -12V, and +5V rails plus Gate and CV signal distribution.

A compact isolated power supply PCB designed for use with industry-standard encapsulated DC/DC converter modules, providing a stable bipolar output with input and output filtering for low-noise operation.

A DIY Eurorack utility module with a 4x4 matrix layout allowing any of four inputs to be routed to any of four outputs with individual level control, for mixing audio and control voltages.

A complete Eurorack matrix mixer DIY kit with a 4-input, 4-output configuration for routing and mixing audio and control voltage signals, including all components and a hand-screened front panel.

A DIY Eurorack control voltage utility module that generates a bipolar CV using a single knob and distributes it to up to four independently scalable and invertible outputs for coordinated modulation.

A DIY Eurorack monitoring module functioning as a mixer add-on that allows pre-fader listening of up to four audio channels with a built-in mono headphone amplifier based on dual LME49600 ICs.

A compact Eurorack PCB and front panel DIY kit for a voltage-controlled oscillator based on the CEM3340/AS3340 core, offering two simultaneous waveform outputs.

A fully assembled and calibrated Eurorack voltage-controlled oscillator based on the AS3340/CEM3340 design, ready to use with no DIY work required.

A 10HP Eurorack PCB and front panel DIY kit for a CEM3340/AS3340-based voltage-controlled oscillator, PCB and panel only without electronic components.

A 10HP Eurorack full DIY kit for a CEM3340/AS3340-based voltage-controlled oscillator, including PCB, front panel, and all electronic components with SMD parts pre-assembled.

A fully built and calibrated Eurorack voltage-controlled oscillator based on the AS3340 IC, generating Square, Triangle, Ramp, and Sine waveforms with sync and FM options.

A Eurorack PCB and front panel DIY kit for a voltage-controlled oscillator based on the AS3340 IC, including the AS3340 chip.

A Eurorack PCB and front panel DIY kit for a dual voltage-controlled amplifier based on the CEM3360/AS3360 chip, with two independent VCA channels.

A Eurorack PCB and front panel DIY kit for a sub-octave generator based on the 4024 CMOS IC, with octave selection switches.

A fully assembled power expansion board that adds a regulated +5V rail to Eurorack systems by converting +12V, installed directly into the power bus.

A PCB-only DIY board that regulates +12V down to +5V and distributes it to the Eurorack power bus, without included components.

A set of five 9mm vertical PCB mount B100K linear potentiometers for DIY synth and Eurorack builds.

A replica of the classic Davies 1900H potentiometer knob with a brass insert and hexagonal screw, compatible with 6.0mm and 6.35mm shafts.

A switched 3.5mm mono jack socket for PCB mounting, used in DIY audio and modular synthesizer builds.

A hand-built Eurorack module recreating the classic TR-808 bass drum circuitry with added pitch adjustment and optional longer decay, featuring tone, decay, and level controls.

A DIY Eurorack drum module PCB and front panel kit based on the original TR-808 bass drum circuitry, featuring pitch, tone, decay, and level controls.

A 12HP Eurorack PCB and front panel kit that transforms an external VCO into a drum sound generator through pitch slide, filtering, and amplitude shaping.

A power ribbon cable with a 16-pin IDC connector on one end and a 10-pin IDC connector on the other, used to connect Eurorack power supplies to modules.

A power ribbon cable with 16-pin IDC connectors on both ends, used to connect Eurorack power supplies to modules.

A dual gain-reduction VCA Eurorack module where incoming CV or audio reduces the signal gain rather than increasing it, designed for sidechain-style ducking effects with adjustable attack and decay.

A transistor-based Eurorack wavefolder PCB and front panel kit featuring two identical independent folding circuits that add harmonics to simple oscillator waveforms.

A Eurorack PCB and front panel DIY kit for a voltage-controlled ADSR envelope generator based on the CEM3310/AS3310 IC, with CV inputs for each envelope stage.

A DIY Eurorack effects module built around the Belton BTDR-2H reverb brick paired with a dual VCA stage on the wet signal, allowing voltage-controlled reverb level for gated reverb and rhythmic modulation effects.

A DIY Eurorack PCB and front panel kit built around the LM13700 IC providing classic ring modulation effects with Symmetry and Modulation Amount trimmers for tonal control.

A Eurorack PCB and front panel DIY kit for an 8-step CV and gate sequencer based on the 4017 IC, with individual CV pots and gate switches per step.