Lm3914 3915 3916

Discussion in 'General Electronics Chat' started by aespino88, May 17, 2010.

  1. aespino88

    Thread Starter Member

    Mar 31, 2010
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    whats the difference between lm3914 15 and 16??? which 1 would be best for a 12 led vu meter?
     
  2. Bychon

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    Mar 12, 2010
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    Do you know how to look up data sheets? Do you know how to read them?
     
  3. retched

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  4. aespino88

    Thread Starter Member

    Mar 31, 2010
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    if i knew how to do that i wouldn't be asking on a circuit forum, would i???

    on the videos i seen they talk about a dot something to change the effect of the vu meter, is that a separate component or like a switch???
     
  5. beenthere

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  6. SgtWookie

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    Jul 17, 2007
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    They are dot/bar display drivers. You can select which mode, dot or bar, by how you wire it up. You can also get interesting combined effects, depending on how you wire it.

    The LM3916 was designed to be a 10-LED VU meter display driver.
    However, if you want to go to 12 LEDs, then use two of the LM3915 drivers, as the LM3916 does not work well when cascaded.
     
  7. retched

    AAC Fanatic!

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    There is a circuit in the datasheet for using a ML3915 and LM3916 together to get the desired result.

    And as the Sarge said, there is a mode pin that determines dot or bar.

    Dot is where a single led jumps up and down the meter, usually leaving a dot at the peak for a second or so.

    The bar, fills the meter from bottom to peak.
     
  8. Bychon

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    Mar 12, 2010
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    The way to find data sheets is to go to manufacturers website or sellers website and type in the part number in the search box. Parts that start with "LM" are made by National Semiconductors. My favorite site for data sheets is www.mouser.com because the search box jumps up on the first page at the top. Very easy to find.
     
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