build pulse generator 5 sec 12v

Discussion in 'The Projects Forum' started by ChevyLT1Camaro94, Nov 17, 2013.

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  1. ChevyLT1Camaro94

    Thread Starter Active Member

    Jan 9, 2009
    hello all, here is what i need to do. i need a circuit that when it gets a constant 12v input, will pulse 12v at maybe 100mA or less every 5 seconds roughly. doesn't need to be super accurate. i want to use this to cycle through the flash patterns on my emergency lights. i was thinking a 555 timer but I'm not exactly an electronic engineer. any help is appreciated

    12v constant input
    pulse 12v 100mA output every ~5 seconds
  2. wayneh


    Sep 9, 2010
    You're right, for a standard LED flasher you need a 555 circuit called an astable multivibrator. Take a look here, or Bill's blog.
  3. ChevyLT1Camaro94

    Thread Starter Active Member

    Jan 9, 2009
    So which schematic would I use? I need a 12v output
  4. Dodgydave

    Distinguished Member

    Jun 22, 2012
  5. Wendy


    Mar 24, 2008
    The owners of All About Circuits has elected not to host discussions of automotive electrical system modifications/enhancements due to safety concerns, the potential of legal ramifications and the possible circumvention of vehicle regulations at the state and federal level.

    This thread is against the AAC forum rules, Chapter 6, as seen here:

    This can be found in our Terms of Service (ToS)

    Automotive modifications of any kind are strictly forbidden. Therefore, this thread will be closed.

    Please try to understand the reasons behind this action, and feel free to browse and use the forums.

    You might find answers to your questions in one of these forums:

    Another good forum that shares many of the same membership is . Good luck.
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