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Discussion Starter #1
I have a 3.5mm audio jack with a switch build in. When you plug a jack in the switch opens. I would love to use this build in switch as a power on switch for a small device so when i plug in a head phone jack it closes a circuit and powers on the device. I don't know how to use the open circuit of the audio jack to close a power circuit.

Can anyone help me figure this out?
 
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