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how replace mechanical pot with an IC digital pot

Discussion in 'General Electronics Discussion' started by JJoll, Jul 7, 2013.

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  1. JJoll

    JJoll

    11
    0
    Jul 7, 2013
    hi everyone,
    I want to know how to replace mechanical pot (used to control volume) with an IC digital pot in a "HEADPHONE EXTENSION CORD":
    http://www.radioshack.com/product/index.jsp?productId=2102975
    I need to do this because I would like to control the volume through arduino connected to digital pot, and since I have never used digital pot, I would like to know how? any idea how it works and how to replace it?
    thanks
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,448
    2,809
    Jan 21, 2010
    1) First find your digital pot chip.

    2) Next look at the datasheet for it.

    3) Follow the instructions.

    I suggest you do step (2) and determine how difficult step (3) will be before purchasing the chip.

    There are many chips and I would hazard a guess that all will have some volume control application shown in their datasheet.

    HOWEVER: Be aware that volume control chips are designed for signals and not power. You may well find that the range of resistance is different than the device you have and that it is not suited for use in this application without a subsequent amplifier.
     
  3. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

    4,960
    651
    May 8, 2012
    Check out the AD5228(DigPot) data sheet but all of what Steve said applies here, especially the driver issue because it's not meant to drive 30 Ohm loads. IE. it's not a power handling component.

    Chris
     
  4. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

    4,960
    651
    May 8, 2012
    Here's another to Google: AD5220 DigPot

    Chris
     
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