LED 555 Timer Question

Discussion in 'The Projects Forum' started by jwspark572, Apr 6, 2009.

  1. jwspark572

    Thread Starter New Member

    Apr 6, 2009
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    I have an LED 555 timer project that I would like to change. I got the design from the internet; which I hand drawn to paper. The circuit right now uses 6vDC; which I have built and works. I would like to run it from a 12vDC battery source. What changes would I need to make? How many LED's can I run in series/parallel?
    please see attachment
    Thanks for any help!
     
  2. Bernard

    AAC Fanatic!

    Aug 7, 2008
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    At 12V , 555 @ 20 ma , output .2V & 10.75V [ measured], blue 3 LEDs with 110Ω, red , 5 LEDs with 62Ω, or maybe better, 4 LEDs with 160Ω. Using max current from 555 @ 200 mA, could use 10 strings, might cut back a string or two for longevity. All figures subject to review.
     
  3. Wendy

    Moderator

    Mar 24, 2008
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  4. jwspark572

    Thread Starter New Member

    Apr 6, 2009
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    Thank You Mr. Marsden for the link. The articles are a big Help.

    Joe
     
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