i8

Potential Divider

Eurorack modules use 12V voltage levels, but Arduino’s analog inputs expect 5V. Because of this discrepancy, we will need to use a potential divider along the way. We have two options for it: upstream of the analog port, or downstream. Both options have pros and cons, which are worth reviewing.

If we put the potential divider upstream, we could use standard Arduino shields, but we would need to amplify their outputs to get back to 12V. If we put it downstream, inputs and outputs would remain on a 12V level, but we could not use standard Arduino shields that make use of the analog ports.

Quite frankly, I’m not sure which way to go…

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5 thoughts on “Potential Divider

  1. mengqimusic says:

    In fact you can keep it 5V, some diode clamping protections at the inputs would be good. There are a lot of digital Eurorack modules that respond to just 0-5V.

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  2. julien says:

    I’m not sure you need to fix such a decision. It could be determined on a shield by shield basis.

    Case A: I would see the Arduino as a controller of the signal path, which would stay at +-12V. The Arduino would generate control signals in the 5V range for the analog signal path.

    Case B: the Arduino generate sounds. In this case you may need an amplifier to raise the audio level. I would look at how Mutable Instrument does this in their modules.

    A question: will the jack on the front panel be reconfigurable as inputs or outputs?

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