Use of 3914

Discussion in 'General Electronics Chat' started by devgorkha, May 2, 2011.

  1. devgorkha

    Thread Starter New Member

    May 17, 2010
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    can i use LM 3914 as led bar graph display for audio source ? pls ... suggest me related circuit
     
  2. beenthere

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  3. shortbus

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  4. marshallf3

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    Jul 26, 2010
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    If you go directly to the http://www.national.com website and enter LM3914 (or 15 or 16) into the search box you'll get access to the full data sheet that has tons of info in it as well as a lot of application notes that illustrate the many ways the IC can be used.
     
  5. KJ6EAD

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  6. SgtWookie

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    Jul 17, 2007
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    If you want a single 10-LED bar graph, then use the LM3916 VU meter IC.
    If you want more than 10 LEDs, use the LM3915 logarithmic IC's.
    The LM3914 will not work well for music, as humans basically hear in decibels, which is much closer to a logarithmic scale than a linear scale.
     
    Last edited: May 4, 2011
  7. Audioguru

    New Member

    Dec 20, 2007
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    No.
    If you want the different spacings of an LM3916 VU meter then use only one.
    If you want logarithmic equal spacings and/or want to cascade them then use logarithmic LM3915s.
     
  8. SgtWookie

    Expert

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    Thanks A.G.; I was distracted while making that post. I've corrected the part numbers in my post.
     
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