12v DC timer

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

  1. satchmolips

    Thread Starter New Member

    Jan 30, 2011
    2
    0
    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)
     
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