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MIDI to Din / Din to MIDI Sync Convertor

Courtesy/Thanks to: Colin Fraser

Description: from Colins homepage

This page gives details of what may be the smallest, lowest part-count MIDI to Din / Din to MIDI Sync convertor about. A big advantage of this design is that the circuit uses so little power, it can be reliably powered from the MIDI output socket of another device.

The disadvantage is, it won't cope with a PC that sends very irregular MIDI clock pulses, so YMMV.
An improved designed based on a more powerful PIC may be forthcoming when I get some free time...

A switch controls which direction it should operate in - the DIN socket switches between input and output as required.
The code can also be used in the original configuration for MIDI to DIN only - just tie the mode select pin high.

To provide power for the convertor a MIDI device must be connected to the MIDI IN socket, even if the device is being used for DIN to MIDI conversion. The circuit can be modified to use an external 5 volt supply - see notes on schematic, or you can make up a little adapter for a regulated 5v supply to connect it directly to the appropriate pins on the MIDI Input socket (pin 2 = 0v, pin 4 = 5v).

Check out for more updated information on Colins homepage.


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   PCB overlay for the M2D
   Assembler / Assembly file for the M2D
   HEX file for the M2D.
   Schematics for the M2D
   PCB overlay for the M2D
   Picture of the M2D
Parts used
   8-Pin DIP Single-Channel Low Input Current High Gain Split Darlington Output Optocoupler
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