DIY Multichannel MIDI to CV converter, new design

[elkayem]

Hi All,

I had recently solicited and received great advice on the design of a MIDI to CV converter. The final result was a single-channel converter using a 5-pin DIN MIDI input, built directly into my synthesizer.

After building it, I realized I wanted MORE! My synthesizer has 3 VCOs after all, and wouldn't it be nice if I could drive all three independently with a sequencer app on my iPad. I finally put together what I wanted, and just uploaded the design (including a nifty 3D printed case) at:

https://github.com/elkayem/usbMIDI2CV_MC

I thought I would share the design here in case anyone else was looking for a good winter project. I'll also entertain code feature requests. This design features an OLED user interface for configuration settings, so it is quite flexible. A few more features:

• Three channel Note CV output (88 keys, 1V/octave, MIDI channels 1-3) using a 12-bit DAC
  
• Configurable note priority for each channel (Highest Note, Lowest Note, or Last Note Priority)
  
• 5V Gate/Trigger outputs, where each channel can be independently configured to either output a gate (output high for entire length of time that note is on) or trigger (20 msec pulse each time a new note is initiated)
  
• Velocity CV output (0 to 4V) for each channel
  
• Pitch Bend CV output (0.5 +/- 0.5V), which can be configured for channel 1, 2, or 3
  
• Control Change CV output (0 to 4V), which can be configured for channel 1, 2, or 3
  
• OLED user interface, used for setting parameters and saving to EEPROM
  

Anyway, here are a few photos. Enjoy!

[Grumble]

Nice built!

[elkayem]

[Sheer Kahn]

Thanks man, I'm still using the first model. Looking forward to building this one, you saved me even more work. Much appreciated!

If you are taking requests for modifications/additions then I vote for more CC outs . the more the merrier as far as I am concerned. Really handy if you are sequencing your synth from a DAW.


I probably won't build it for a while, got a big project on, but I will try to incorporate it. Again, big thanks for sharing your work!

[elkayem]