I have a audio jack with a build in switch that when an nothing is plunged in the switch lead is grounded but when you plug something in its no longer grounded. I want to use this audio jack as a power switch so when you plug in something an arduino gets power and turns on.

I am not sure how to make this circuit, maybe there is some kind of transistor or relay that works this way but i just don't know about it.

Please help.

I have a audio jack with a build in switch that when an nothing is plunged in the switch lead is grounded but when you plug something in its no longer grounded. I want to use this audio jack as a power switch so when you plug in something an arduino gets power and turns on.

I am not running power through the jacks, I am using them for audio in my project. I am making a small box with no visible switches that when you plug in some ear phones it turns on and plays music. I just need some kind of switch or relay that will turn on the device when the switch leg if of the audio jack is no longer connected to ground.

I am not sure how to make this circuit, maybe there is some kind of transistor or relay that works this way but i just don't know about it.

Please help.