drkzrg/yamaha-x3423

Attaching a Yamaha X3423 17x motorized fader board to USB.

Faderboard Controller for a Yamaha X3423

This project takes out the X3423 motorized faderboard from a Yamaha 01v96 mixer and lets you wire it up via USB. Additionally, it will have a display for each two faders that can display information such as the assigned control.

Features right now: - Fader values are sent and received via MIDI CCs 1-17; sending a CC via MIDI will move the fader to the respective position. - Integrating position regulator allows precise movement of the faders (which would otherwise stop a bit before the actual target position due to friction). - Faders can work continously or in discrete steps; CCs 71-87 control the number of steps (where 0 means "continuous"). - Calibration data is stored to flash. Perform a calibration by sending CC 100.

Hardware setup

Use a 1.25 pitch FFC A ribbon cable with 34 pins (Note: these are quite difficult to get, I bought a 40-lane-cable and cut it down.) to connect the PCB with the faderboard on CN001; either use the proper connector (not JST) to connect J12 with CN002, or solder an appropriate connector/cables to CN002. Connect J16 and J17 to a buck/boost converter accepting 16V and outputting +15V/-15V, e.g. DD39AJPA (DD1912PA should work too) from your favourite chinese marketplace.

Be sure to simultaneously power up both the main PSU and the USB board for now.