x0xb0x.

I built this in a few days, whilst waiting to acquire some rare transistors to finish the 9090. The 9090 took weeks.

The x0xb0x is a clone of the infamous Roland TB-303 "Transistor Bassline", designed by Adafruit Industries and originally supplied by them. Kits are currently available from several sources. I got mine from http://www.x0xsh0p.de.

The underside of the main PCB. This is split into two sections - towards the front is the synthesiser, using mainly original '80s "rare parts" and at the back is the sequencer. The ATmega for the latter is missing in this shot.

The top of the same PCB, with buttons and LEDs for the sequencer in the foreground and potentiometers for the synth at the back.

The main PCB mounted in the case, and wired to the IO board which contains the MIDI, DINSYNC and USB interfaces, CV and Gate out and the audio jacks. The power supply is also on this board.

The completed x0xb0x.