"If you're a fan of acid bass, the original TB-303 and Eurorack synth modules, then this one is for you… With the module being sold for the appropriate sum of $303 it’s easy to see why this has been snapped up so quickly."

The Roland TB303 voice practically defined Acid music, heavily influencing the development of electronic music. Add that voice to your own setup with the x0x-heart Eurorack Module.

The x0x-heart module is the analogue section extracted from the x0xb0x (a TB303 clone) and made small enough to fit the Eurorack format. More nimble as a module, you no longer need to work within the constraints of the original TB303’s sequencer.

Product progression: TB303 -> x0xb0x -> x0x-heart -> xox-heart Module

Features

CV control of frequency, gate, accent, slide, env-mod, decay, and cut-off

Switches for waveform selection (square and sawtooth), external/internal oscillator mix

VCA and VCF outputs

Specifications

Eurorack standard format (3U height)

18hp

~1.75in depth (45mm)

+/-12V current draw 10mA

5V current draw: 50mA

Hardware Build

Black anodized aluminum knobs with a diamond knurl pattern and two set screws (with slot heads and flat points)

A .063” (1.6mm) highly durable satin aluminum Metalphoto panel with a black print

Kit/assembled module includes 10” Euro power cable (16 pin to 10 pin connector)

x0x-heart Module Kit

Build you own x0x-heart Module using only through-hole soldering. All you’ll need is patience, and a soldering iron/solder. Tuning required.

x0x-heart PCB (SMD soldering done)

pacemaker PCB (SMD soldering done)

Grayscale front panel

10” Euro power cable (16 pin to 10 pin connector)

Knobs

Switches, jacks, pots, headers, interconnect cables, nuts, washers, Euro mounting screws, etc.

Tuning/assembly information can be found at the Open Music Labs wiki: http://wiki.openmusiclabs.com/wiki/x0x-heart, http://wiki.openmusiclabs.com/wiki/EuroAdapter. Assembly video coming soon.

Open Source Hardware

To help you truly understand and control what you and your module is doing, Open Music Labs makes all schematic and board layout files available for your perusal and use.

Pacemaker (DIY version) source files http://wiki.openmusiclabs.com/wiki/EuroAdapter

Heart source files http://wiki.openmusiclabs.com/wiki/x0x-heart

About Open Music Labs

The goal of Open Music Labs is to create a central web location where people interested in using analog and digital audio equipment can go to find ideas, histories, parts, and like-minded others.

We want to create a resource people can use to share ideas and learn new things about hands-on audio creation, manipulation, and interaction.

Open Music Labs is a subsidiary of Flingco Sound System in Chicago.

2013 Flashback: a x0x-heart prototype - slaved to a TB303:

Special Thanks

Grayscale: Panel designer/manufacturer and all-around idea factory.

Tyler Thompson - T^2official: Video soundtrack artist and cool dude. His pro tip:

”Well my favorite thing about this module is how close it sounds to the real deal and I can sequence it with a less archaic sequencer. (I personally don’t gel with the x0x style sequencer.)

I recommend people pair it with a sequencer that has adjustable gate length per step like the Audio Damage Sequencer 1 or Industrial Electronics (Harvestman) Stillson Hammer MKII.“