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  • MIDI to Voltage Interface

    For the implementation of my MIDI to Voltage Converter I decide me for a Arduino Board and a 12Bit Digital Analog Converter. In this case I use an Arduino Mega 2560 and a MAX525 DAC.
    The DAC is controlled via SPI. Beside the DAC there are a Voltage Reference (LT1236), several OP Amp Buffer (LF356 for the Reference and the voltage output) ,a 74HC14 Schmitt Trigger inverter (for a clean triggering of the SPI bus) and a LM7805 linear voltage regulator for the Digital parts and the MIDI board.
    The output ranges is 0 to 2V.

    SPI to Voltage_web
    Breadboard with one output channel.

     

    MIDI Anschluss_web
    MIDI Board.

     

    Arduino+MIDI_web
    MIDI Board and Arduino Mega 2560.

     

    Schematics:
    Spi to Voltage.pdf

    MIDI Board.pdf

    Module Connection.pdf

    Here a first test.

    The detune in the low octave is the result of the 12Bit DAC.

     

    Update 15-11-2013:

    Project documentation:

     

     

     

    Datasheets:
    MAX 525
    LT1236
    LF356
    6N139
    74HC14

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