looking for a circuit's name

Discussion in 'General Electronics Chat' started by doronb, Jan 28, 2009.

  1. doronb

    Thread Starter New Member

    Jan 28, 2009
    2
    0
    hi everybody,
    i am new to this forum,
    a mechanical engineer who works as a tour guide but in my free time trying to develop some stuff.

    i am looking for a circuit scheme but do not know how it should be called.
    (my mother's language is not english)

    the circuit should act like this :

    1. there is a DC source that varies between 9V to 12V (3v dynamo + 9v dc battery)
    2. there are 4 bulbs.
    3. i wish to light 1 bulb if the voltage is 9V.......
    light 2 bulbs @ v=10V, light 3 bulbs @ v=11V, light 4 bulbs @ v=12V.
    4. it should probably consist of diods and/or transistors.

    thanks ahead for the help.

    doronb
     
  2. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    Try a search on "window comparator."
     
  3. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    You want a bar graph. It is easy to do with a LM339 comparitor, if all you want is 4 lights. If you want more then you probably want to use different chip (part number escapes me at the moment).

    Don't worry about speaking english well, a lot of our members don't. Just do the best you can and we'll work with you.
     
  4. doronb

    Thread Starter New Member

    Jan 28, 2009
    2
    0
    i am starting to google these options.
    i don't know thse circuits, so they might be what i am looking for.
    if somebody else has ideas it will be happily acceptable.
    thnx
    doronb
     
  5. PIC_User

    Member

    Sep 22, 2008
    20
    0
    Maybe the LM3914 - Dot/Bar Display Driver
     
Loading...