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Bar graph driver, 5-15V

Discussion in 'General Electronics Discussion' started by Sherston, May 8, 2013.

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  1. Sherston

    Sherston

    3
    0
    Apr 30, 2013
    Hi all

    I've been given a project in which i am to design a PSU with a variable 5-15V output, indicated by a 10 step bar graph LED. I am however having a little trouble figuring out how to setup the LM3914 driving the bar graph.

    [​IMG]

    Any assistance regarding this matter would be very much appreciated.
     
  2. BobK

    BobK

    7,682
    1,686
    Jan 5, 2010
    You will need to convert the 5-15V range to 0-12V You can do this with an opamp.

    Bob
     
    Last edited: May 8, 2013
  3. Rleo6965

    Rleo6965

    585
    9
    Jan 22, 2012
    You will have problem if psu dc output was +5V. You will notice that LM3914 +V minimum voltage was +6.8V.
    You need another +DC supply for LM3914 +V.
     
    Last edited: May 10, 2013
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