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signal impulse led indicator with hold

Discussion in 'General Electronics Discussion' started by madstudio, Jan 16, 2013.

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  1. madstudio

    madstudio

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    Jan 16, 2013
    Hi everybody, I need a help about designing small circuit . As title says, I need to establish voltage for LED from short 5v impulse (few ms) but with hold of 5 or more seconds. I presume that it's not so complicated, maybe one transistor few resistors and capacitor, but honestly I'm not so knowledgeable. :eek: Any help?
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    As I understand it, you want the circuit to light the LED for 5seconds whenever a 5ms pulse arrives, right?

    If so, look up monostable multivibrators. There are lots of simples circuits using two transistors or one NE555 timer IC.

    Harald
     
  3. madstudio

    madstudio

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    Jan 16, 2013
    Exactly :) thanks, so something like this? http://www.circuitstoday.com/555-timer-as-monostable-multivibrator
     
  4. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    Yes, just one example out of many...
     
  5. madstudio

    madstudio

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    Jan 16, 2013
    I decided to go this way. It looks OK but I would like to check did I missed something ;)
     

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