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alternating LED flasher using 12Vdc supply and 555 timer

Discussion in 'LEDs and Optoelectronics' started by tr1, Mar 25, 2013.

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  1. tr1

    tr1

    6
    0
    Mar 14, 2013
    could some one direct me to a ckt. diagram please? I would like to assemble an alternating
    LED flashing ckt. for use on a model railroad, your help is grately appreciated, thankyou,tr1.
     
  2. CocaCola

    CocaCola

    3,635
    5
    Apr 7, 2012
    Google "two transistor flasher" skip the 555 it's overkill..
     
  3. tr1

    tr1

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    0
    Mar 14, 2013
    thankyou,cocacola,tr1
     
  4. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

    4,960
    651
    May 8, 2012
  5. tr1

    tr1

    6
    0
    Mar 14, 2013
    CDRIVE ,THANX, for your instructions, tr1
     
    Last edited: Mar 27, 2013
  6. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

    4,960
    651
    May 8, 2012
    Your welcome. Here's an updated version for 12V operation. The LEDs should flash at about 1 Hertz. Each LED is on for 1 second while the other is off. Please note that it's important to observe the polarity of the caps as shown.

    Personally, I'd use a 555 because it would only need one timing cap and fewer components.

    Chris
     

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