12v DC timer

Discussion in 'The Projects Forum' started by satchmolips, Feb 2, 2011.

  1. satchmolips

    Thread Starter New Member

    Jan 30, 2011
    OK with help from this forum have made my trip alarm switch which will complete a circuit from a 12 volt car battery to air horn. (trespass issue!).
    I would like to out a timer in the circuit so the horn sounds for two minutes or so. What are the options please?? (No mains avaialable)