Midi 808 (Midi to Dinsync converter)

This is a MIDI to Dinsync converter I use to sync up my Roland 808 drum machine to Logic. The device runs off a 9v battery or power supply. The bottom DIN connector is a MIDI input. MIDI start, stop, and timing clock messages are recognized on input and sent out (as TTL signals) to the "Din Sync" connector which control the 808 drum machine.

I use gEDA tools on Linux for hardware development. The Schematic was drawn using gschem and the PCB board was laid out using pcb. Blank PCB boards were manufactured by Batch PCB.

I developed Software using GCC AVR compilers on Linux and I use avrdude to program the parts.

Highlights:

• Atmel ATTiny 2313 processor running at 8Mhz
• Midi input using opto-isolator (required by the MIDI standard).
• Simple TTL outputs (run through 330 ohm resistors) for Dinsync.
• Dinsync out can also be a MIDI output by removing R6/R7 and loading R8/R9.

Source Code

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