This is a case for the great nanosynth module made by Heise Verlag I built this for use with Atari ST/TT/Falcon computer to enjoy playing MIDI files or playing games that are able to use MIDI for music output - without the need for a MIDI keyboard or other more complex wiring.

Parts used:

• nanosynth module
• 5-pin DIN socket
• Optocoupler 6N 136
• Power source, 5V DC (100mA seems to be enough; chip's current is 18mA)
• Wires/Sockets for Line out

Update: Final version. SCAD files are somewhat customizable (Logo, Text, Hole)