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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


    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.


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


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

    Last edited: May 8, 2013
  3. Rleo6965


    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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