Signal invertor for power switch using 3.5mm audio jack switch

Question

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?

Answer 1

I figured it out, i just needed to use an NPN transistor.

Answer 2

Just use a pull-up resistor to Vcc and a connection to GND and you're set. Use the ENABLE signal (active high) for triggering power-up as needed.

^{simulate this circuit – Schematic created using CircuitLab}

Or you could also use the jack switch to turn ON a PNP BJT and switch a load (or a relay if you want to switch higher voltages):

^{simulate this circuit}