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Siren Switch

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FredL

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I currently have an alram system that uses a 8 OHM 15W speaker. The sound is not very loud, so I want to add a 12 volt siren to the system. I have a 12 power supply to the siren, but I need so way of switching it on when the speaker comes on. Is there any type of switch that is activated from the signal that turns the speaker on?
 
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