Automotive Turn Signal Flasher - Lamp Outage Detection

Discussion in 'The Projects Forum' started by abuhafss, May 4, 2013.

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  1. abuhafss

    Thread Starter Senior Member

    Aug 17, 2010
    Hi Everybody

    I am working on an automotive turn signal flasher circuit.

    Usually, the original flasher unit installed in a vehicle is IC-based which detects lamp outage i.e. when any of the 3 indicator lamps fail, the flashing frequency is doubled.

    I am thinking of using a 555 flasher system or a 2-transistor flasher system and using some comparator IC to detect lamp outage.

    I came across the attached schematic while googling, maybe this can be of some help.

    I shall appreciate your assistance.
    Last edited: May 4, 2013
  2. bertus


    Apr 5, 2008

    I am closing this thread as it violates AAC policy and/or safety issues.

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    There will be enough sites where automotive questions can be discussed :
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