led flasher schematic

Discussion in 'The Projects Forum' started by karthik_dm, Oct 16, 2008.

  1. karthik_dm

    Thread Starter Member

    Oct 16, 2008
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    hey try these LED flasher circuits,they are nothing but square wave oscillators, to adjust the flashing period, we've to vary the duty cycle.....
     
  2. DickCappels

    Moderator

    Aug 21, 2008
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  3. Wendy

    Moderator

    Mar 24, 2008
    20,766
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    This is my favorite. I miss the LM3909 though, I like the D cell battery concept..

    [​IMG]

    I think it compares pretty closely if you remove one of the LED legs parts wise. A transistor is simpler than a chip though.
     
  4. KX0Z

    New Member

    Nov 11, 2008
    3
    0
    You can still find the 3909 on Ebay every now and then. Kind of pricy though. I have 3 still laying around, actually in use at the moment.
     
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