Help needed to create a timed cut-out for 2.5V 0.2A circuit

Discussion in 'General Electronics Chat' started by t33stat, Jul 8, 2016.

  1. t33stat

    Thread Starter New Member

    Jul 8, 2016
    2
    0
    Relatively new to the world of electronics, it just all seems so magical to me!

    I was hoping be able to figure this out but can’t seem to find anything online which performs the function I need,

    So here is the scenario:

    2.5V panel mount LED on a boost control box running around 0.2A, the LED is on constantly, and I’d like to turn it off after a few seconds of being on, at the moment I have a flap of electrical tape that I put over it when im driving at night!

    I have looked into a 555 timer but the circuits seem to require 5V,

    There is a local 12V supply that is constantly live, but I don’t want to introduce any more voltage into the box from fear of blowing it up!

    Would anyone have any suggestions? Im sure there must be a simple way to do this that im just not able to find!


    Thanks :)
     
  2. dl324

    Distinguished Member

    Mar 30, 2015
    3,250
    626
    Welcome to AAC!

    Why not just dim the LED?
     
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  3. AlbertHall

    Well-Known Member

    Jun 4, 2014
    1,969
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    The NE555 is good 4.5V to 16V supply but you don't say what supply voltage would be available (unless it is 2.5V?).
     
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  4. t33stat

    Thread Starter New Member

    Jul 8, 2016
    2
    0
    The supply voltage is 2.5V

    Yes i could dim the LED but ideally i would just like to interrupt the power and turn it off completely.

    I could cut out the LED but i still want to know that it has powered on correctly.
     
  5. AlbertHall

    Well-Known Member

    Jun 4, 2014
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  6. dl324

    Distinguished Member

    Mar 30, 2015
    3,250
    626
    This isn't an issue.
    You'll get better responses if you post a schematic and/or block diagram of what you want to accomplish. Show how the LED is wired, how the booster is connected, and where the 2.5V supply is coming from (you said you were driving, so everything should be powered from the battery/alternator).
     
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