555 Timer with Variable Resistor

Discussion in 'The Projects Forum' started by CraigBolton88, Oct 10, 2008.

  1. CraigBolton88

    Thread Starter New Member

    Oct 10, 2008
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    Hi, i am currently undertaking a project and part of it involves a flashing LED. Just looking for any ideas to alternate an LED between flashing at a rate of 1 per sec and then faster up to it being continuously on. I was thinking a variable resistor would do the job? Any help would be great! :).
     
  2. Wendy

    Moderator

    Mar 24, 2008
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    How about this...

    [​IMG]

    You probably should break the resistor up between a variable and a fixed value, the fixed value will set your max freq.

    ***********************

    For what it's worth, I've built the above circuit (with one LED going to ground) with just one variable resistor.
     
    Last edited: Oct 10, 2008
  3. iONic

    AAC Fanatic!

    Nov 16, 2007
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  4. triggernum5

    Active Member

    May 4, 2008
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    Yea, put the minimum resistance safe for a 555 (about 1K is definately safe) in series with your pots.. Otherwise you'll end up frying the 555 each time you dial too low..
     
  5. Wendy

    Moderator

    Mar 24, 2008
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    Actually, not. It hits a max and can't go any faster.

    Have you had some bad experiences?
     
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