Photosensitive resister On/Off Led circuit

Discussion in 'General Electronics Chat' started by kongway, Apr 12, 2007.

  1. kongway

    Thread Starter Member

    Apr 12, 2007
    12
    0
    I try to design a circuit (attached is my design) , using photosensitive resister to automatically turn ON the Led, when here are dark. Otherise Led are OFF. But some barrier was occur, i don't know how to fix it. So if any body have idea, please advise me and give me opinions about my circuit and the component value.

    Thank a lot!
    Kongway

    Please find attached again
     
  2. kender

    Senior Member

    Jan 17, 2007
    263
    0
    Your attachment didn't get posted.
     
  3. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    The image is very small and hard to make out. If the applied voltage is positive, the transistor is in cicuit with the emitter and collector reversed.
     
  4. kongway

    Thread Starter Member

    Apr 12, 2007
    12
    0

    thank you beenthere,
    Actually, i don't know my circuit is work or not and push 3 Led on brightly. So can you please provide a circuit to me?

    Thanks again
    Kwongway
     
  5. electronics wiz

    Active Member

    Mar 15, 2007
    54
    0
    you can use a compartor if you want, that would also let you ajust the circuit.
     
  6. kongway

    Thread Starter Member

    Apr 12, 2007
    12
    0
    Thank you all
    i already found the circuit!
     
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