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Digital Potentiometer

Discussion in 'General Electronics Discussion' started by lukesmith123, Jan 4, 2013.

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  1. lukesmith123

    lukesmith123

    11
    0
    Jan 4, 2013
    Hi,

    I am replacing an analog potentiometer with a digital one.

    I'm using the AD5220 digital potentiometer and connecting a 9v battery with a 5v 7805 voltage regulator.

    My question is, when the battery is connected to the digital potentiometer via the voltage regulator, will the battery be drained even when not in use or will it only be used when the buttons are pressed from the digital potentiometer?

    Should I incorporate a fixed on/off switch into my design?


    Thanks,
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,411
    2,779
    Jan 21, 2010
    Yes. Even assuming the digital pot has no quiescent current drain (which itself is unlikely), the regulator will draw some power. A 7805 might draw more than the rest of the circuit -- it's certainly not a low power device.
     
  3. lukesmith123

    lukesmith123

    11
    0
    Jan 4, 2013
    Last edited: Jan 5, 2013
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