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12v DC timer

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Thread Starter

satchmolips

Joined Jan 30, 2011
2
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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