Cosmic Ray (Muon) 81 Pixel Hodoscope with Midi Sound

The raw audio output from the Cosmic Ray (Muon) 81 (9x9) Pixel Hodoscope was a little hard on the ears so in an attempt to make this more pleasant, I modified the 9 x 9 matrix output by dividing into a 3 x 3 output using triple input NAND gates (74LS10) then monitoring coincidence between the resulting 3 x 3 matrix using AND gates (74LS08) to convert it to 9 channels, in order to drive a hacked MIDI Korg Nanokey 2 MIDI controller.

electronics inside midiconvertor

To do this, I modified the 9 x 9 matrix output by dividing into a 3 x 3 output using triple input NAND gates (74LS10) then monitoring coincidence between the resulting 3 x 3 matrix using AND gates (74LS08) to convert it to 9 channels in order to drive a MIDI keyboard.

Midi Convertor Circuit

Korg NanoKey2 USB Midi Keyboard
Hacked MIDI Korg Nanokey 2 MIDI controller

Midiconvertor