Need Help

Discussion in 'The Projects Forum' started by Robkelly, Aug 1, 2013.

  1. Robkelly

    Thread Starter New Member

    Aug 1, 2013
    4
    0
    First of all may I give my apologies for ask a very basic question.....I am new to the building of circuits.

    What I want to do is build a circuit that runs off a 9 volt battery, has one LED, rocker switch to turn on LED and a timer to turn of LED.

    Sorry once again for basic question and will be grateful for any help

    Rob
     
  2. tshuck

    Well-Known Member

    Oct 18, 2012
    3,531
    675
    I'm not sure what question you are referring to, I see none here...:p

    You could probably use a 555 in a monostable configuration to do this. I'm sure Bill has an example on his blog...

    Edit:Bill's Blog
     
  3. Robkelly

    Thread Starter New Member

    Aug 1, 2013
    4
    0
    Basically I just want to buy/build a circuit that I can turn on the LED and automatically turns off after a set time
     
  4. #12

    Expert

    Nov 30, 2010
    16,248
    6,745
    How much time?
     
  5. Robkelly

    Thread Starter New Member

    Aug 1, 2013
    4
    0
    Few minutes
     
  6. #12

    Expert

    Nov 30, 2010
    16,248
    6,745
    You can get there with a 555 timer chip designed as a monostable (one-shot).
    See post #2.
     
  7. donpetru

    Active Member

    Nov 14, 2008
    186
    25
  8. elec_mech

    Senior Member

    Nov 12, 2008
    1,513
    193
    Here is a circuit with info on how to get the desired time. If you want the timer to start when you flip the rocker switch, then add a power-on trigger to pin 2 (scroll down the link above).
     
  9. Robkelly

    Thread Starter New Member

    Aug 1, 2013
    4
    0
    Cheers all for the help
     
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