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MIDI Converter

A project log for Virtual Pipe Organ

A modern twist on a classic musical instrument: the Virtual MIDI pipe organ

Johan CronjeJohan Cronje 12/22/2016 at 23:050 Comments

The following schematic converts MIDI input messages from the M-Audio Keystation keyboards to something the Teensy can understand. There are many examples around how to do this, so no need to reinvent the wheel. I selected a schematic using the highly recommended 6N137 Logic Output Optoisolator chip used by many commercial products:

As I have 3 MIDI streams that I have to convert, I decided to create single input PCBs (as opposed to a single PCB with 3 MIDI inputs). The only reason I decided to do this is that OSHpark.com where I get my PCBs made, has a minimum order quantity of three.

The final PCB design:

And the finished item:


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