The first release candidate. Not so shabby for a kit!

Click on the panel picture for a closer look!

The x0xb0x is not just another MIDI-controlled TB-303 clone. x0xb0x is a full reproduction of the original Roland synthesizer, with fully functional sequencer. The sequencer can be programmed just like the original 303 (ok its actually a little easier, we think) and can be used to control other synthesizers via any of its various output formats. 128 banks of track memory and 64 banks of pattern memory are stored in onboard EEPROM, no battery-backup is needed!

x0xb0x is available as a kit that includes all parts necessary to build a x0xbox: PCB, case with CNC machined faceplate, components, buttons and knobs, AC adaptor, pre-programmed microcontroller, and (of course) poorly xeroxed assembly manual*...You supply the sweat & tears.

So far we have made 2 runs of 100 kits each. All but one of the components in the kit are through-hole. Detailed pricing information including freight shipping costs (only for people who have been emailed that they have come up on the waiting list) is available at the Adafruit store. AT THE MOMENT, YOU CANNOT BUY KITS WITHOUT FIRST GOING ON THE WAITNG LIST.

To be put on the waiting list for kits, email:

Before you email me with your question, read the FAQ and search in the forum. If you have a question, please ask it in the forum!

p.s. x0xb0x is spelled with two zeros.
p.p.s. x0xb0x is pronounced "zocks box"

* We don't actually do this, the instructions are all online in glorious high-def &full-color

We tried a bunch of cases until we found one that we felt would be durable yet stylish. The x0xb0x has two CNC machined aluminium face places that fit into a reclosable ABS 'console' box. The top plate is also silkscreened. The x0xb0x is portable, but large enough for users to hack their own modifications in. We tried to put it in an altoids tin, no really, but it just wouldn't fit.

We have two--count 'em, two--analog electrical engineers with too much time on their hands working on this project. An original TB-303 was diassembled and reverse-engineered to verify the schematic. The original transistors were analysed using big expensive curve-tracers to determine their characteristics. We measured every waveform and counted every cycle to give you the best sound...its just like the original because it IS the original.

We tweaked our design until they sounded exactly the same

Our crazy German engineer obsessed over EVERY GODDAMN THING in this synth to make sure it was perfect. We sourced all of the original transistors and op-amps, even though it took months of harrassing people on the phone. Just deciding on which potentiometers to go with took three solid weeks of searching through catalogs. (Its a good thing he's unemployed or he would have been fired for not leaving the house.)

It took us 6 months, but we tracked down the original transistors: 2SK30A JFET, 2SC536F NPN, 2SA733P PNP, 2SC2291 & 2SC1583 matched pairs, LA4140 (the original headphone amp), BA6110 (equivalent to BA662) OTA, AN6562 (original op-amp)

 

No less than 40 LEDs adorn the x0xb0x.

Plug this baby into your computer, using a standard USB port. Our Java software will control the x0xb0x, or let you save/edit stored patterns and tracks in the onboard memory.

x0xb0x has all the I/O you could ever need:

• MIDI in, out, and thru
• DIN Sync (in or out, selectable)
• CV and Gate (1/8" jacks)
• Audio: headphone, mix-in and line-level out (1/4" jacks)
• USB for computer interface & control

DC Jack, Headphone, CV, Gate, USB, Mix-in, MIDI jacks, Line out, DIN Sync (shown w/clear acrylic panel. kit panel will be aluminium!)

We added a couple extra modes to make the x0xb0x more fun than the rest

• Random mode: fill a pattern bank with random notes, or have it just play random notes
• Keyboard mode: just like those casios you had as a kid. Press the keys and sound comes out!
• Rotary encoder tempo knob: for finer control over the tempo, or you can set the tempo via computer control mode
• Firmware upgradable: the C code is written for AVR-gcc, any Mac/Linux/Windows computer can be used to recompile new code for the x0xb0x. Reprogram using the x0xb0x software with USB. Mess something up? You can always revert back to the original firmware.

The x0xb0x will never become 'discontinued,' because it will be fully documented and released into the public domain (under an appropriate open-source license). The PCB files (schematic, board, BOM and gerbers), firmware, software and panel DXFs will be available for download. Even after we sell all the kits, you will still be able to build your own x0xb0x.

We do this because we love you.

The first revision PCB...oh how long its been...