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AM8080 Module - MIDI-CV
Overview This is a MIDI to CV converter with 8 separate control voltages. The design is from MIDIBOX and I have mounted the PCB's into a FracRac as well as made a front panel for the
miniature 16x2 blue LCD, 8 output sockets and 4 control buttons. The converter can be set up to use a rotary encoder.
Detailed of the MIDIBOX MIDI to CV converter project are here.
- Up to 8 CV outputs with 12-bit resolution
- 8 gate outputs
- Outputs can be assigned to 16 MIDI Channels
- Outputs can be assigned to Note/Velocity/Aftertouch/CC/Pitchbender
- 8 independent Note stacks with 16 notes depth!
- Mono/Legato/8 note Poly mode
- Selectable Pitchbender range
- Octave and Semitones Transpose function
- Keyboard Split/Layer function
- Selectable Gate Polarity
- Selectable Output Curve: V/Oct, Hz/V, Inverted, Exponential
- Interpolation function (smoother) with selectable slew rate
- DIN Sync Output
- Easy to use Calibration Function
- MIDI Merger
- Support for BankStick, stores 128 patches
- Configuration via 4 buttons/LCD or via SysEx
AM8080 Design The MIDI box design comes as a set of 3 PCB's and I have designed a fourth:
Core module with PIC micro-controller and MIDI sockets 8 channel DAC - I have used the NG board Front panel button reader LCD and button PCB to hold and panel mount these items
The DAC is a 12-bit TLV5630IDW, which has relatively good resolution even for
Note CV's going to VCO's, and a linear response over 10 Volts within a few percent. The MIDIBOX approach takes more time to build a working solution (compared say with an Oakley Sound MIDIDAC) as the source code has to be altered to
setup the features you want to use, which means compiling the code and sending it to the PIC via MIDI. I also found that the use of 4 PCB's makes for a complex and error prone solution, and the fourth PCB was a necessity to get a
professional finish and to interface the 5V gate signal to a modular system.. However the results are worth while, the LCD menus are very useful, and the design is proving reliable.
There are eight 3.5 mm jack sockets mounted on the bottom section of the panel, these are:
Note Velocity Gate Aftertouch Miodulation CC1 CC2 CC3
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