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Thread: Powering active fader from Teensy LC

  1. #1
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    Powering active fader from Teensy LC

    Hello,

    I'm attempting to use an active fader (innofader) to create a simple MIDI controller with the Teensy LC. The problem is that the connect voltage for the fader is +2.7V to +5.5V (6mA max). Since that's a range of 2.8V, is there a way to offset that to fall within 0-3.3V, or will l I need additional circuitry to achieve this? If not, is there another processor better suited for this voltage range?

    Thanks!
    Last edited by Scatre; 01-18-2023 at 12:08 AM.

  2. #2
    Senior Member+ MichaelMeissner's Avatar
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    Quote Originally Posted by Scatre View Post
    Hello,

    I'm attempting to use an active fader (innofader) to create a simple MIDI controller with the Teensy LC. The problem is that the connect voltage for the fader is +2.7V to +5.5V (6mA max). Since that's a range of 2.8V, is there a way to offset that to fall within 0-3.3V, or will l I need additional circuitry to achieve this? If not, is there another processor better suited for this voltage range?

    Thanks!
    One thought might be to use an I2C DAC like the MPC4725 to generate the voltages. You likely would need to step up the I2C bus from 3.3v to 5v to hook it up. I've not done this, but this is just a thought:


  3. #3
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    Quote Originally Posted by MichaelMeissner View Post
    Indeed, thanks for the recommendations! Since all I could get ahold of at the moment are LC's, I may very well have to go that route. Hoping some internal magic could be worked through native pins and coding magic, though.

  4. #4
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    What an interesting fader. Pity the manufacturer's website doesn't seem to shed any light on the nature of it's output signals.

    If I had one, I'd power it up with +3.3 0r +5v and probe it's output with a CRO and see what it says.

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