Probably the narrowest MIDI to CV converters, I got this idea from the JX-10/8p synths. Each voice card is a self contained 6 voice synth with just data and clock fed to it. Now as I already have a DCO core that generates some signals and has onboard LFOs etc, this midi to CV converter is designed to generate 24 x 0-5v voltages for filter cutoff, ADSR etc. plus it generates 16 switched outputs for filter selections, etc eg invert, envelope loops etc. The spare chip is the 4504 to level shift some of switches down to 3.3v where required. The next part is to fit 6 voices alongside it.
9 Likes
6 working DCOs, I added a led flash to show which note on the board is playing, useful for debugging. Now to add some logic and the filter chips, although I’m missing 24 pin sockets for the AS3372E chips
4 Likes
Well I missed a -5v power run, but caught that before powering up the board, pleased to say it worked first time. No magic smoke and I can play notes and sweep the filters etc.
6 Likes
Managed to squeeze in the final mixer, another LFO for the filter/amplifier with VCA level controls. A noise source with pink/white selection and level controls and then the FV-1 stereo effects processor, 24 extra algorithms on 3 eeproms and finally a stero volume and tremelo circuit. Thought I was getting some FV-1 chips cheap, but it turns out they were power regulators dressed up as FV-1 chips, so need to order some more now.
3 Likes
It’s finally in a state where I can show it to the world, still things to do and fix. I can’t demo all the facilities as Pocket PC runs out of Control change windows at around 32 and I need a lot more.
3 Likes