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LED Bargraph?

Discussion in 'Electronic Basics' started by Beowulf, Feb 5, 2004.

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  1. Beowulf

    Beowulf Guest

    If I a have a 0 to 5 volt signal coming out of small hand-built gaussmeter
    (ok those of you who have read my earlier posts know I built it for
    amateur ghosthunting, but I am also seriously interested in learning
    electronics, this is getting fun since I used to do it a bit when I was a
    teenager), is if hard to somehow eliminate the use of a voltmeter to read
    the voltage and somehow add a Bargraph LED to the breadboard circuit so
    that the voltage (0-5v) lights up the LED bargraph component?

    I just returned from RadioShack where I bought a BASIC Stamp educational
    kit, and while there learned of the LED Bargraph electronic component. I
    would like to learn how to add it to a circuit as described above.
  2. Don Taylor

    Don Taylor Guest

    If the first search term for Google is "schematic" it seems pretty good,
    and a "+" tells it you really mean you want that word included.
    Try google for
    +schematic +lm3914
  3. Beowulf

    Beowulf Guest

  4. grahamk

    grahamk Guest

    have a look at
    Beginners and Intermediate Electronics
  5. Beowulf

    Beowulf Guest

  6. Dmitri

    Dmitri Guest

  7. Anand Dhuru

    Anand Dhuru Guest


    Although I agree the LM39XX bargraph chips are ideal for your
    application, the way I remember it, the LM3915 is internally
    calibrated for logarithmic scale (as in LED VU meters); its sibling,
    the LM3914 is linear.


    Anand Dhuru
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