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I have a small padlock alarm that is powered by a 9 volt battery. I would like to power it with a 9 vdc wall wart adapter but would also want the battery backup just in case someone cuts the adapter power. I'd like to use a 9 volt rechargeable battery with the wall wart hooked up somehow to also...
Circuit Needed
I need a circuit that will turn on low voltage (12VDC) from a contact closure that I already have. I cannot put any voltage on the contact closures. Can someone please help me? tHANKS...
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