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Switched Mono jack + battery: Make circuit when plugged in

Electrical Engineering Asked by Javier Mejias on March 2, 2021

I would like to replicate the functionality inside the Ampoids guitar amp (9v battery) in which the circuit is turned on only when you plugin a male 6.3mm mono jack to it

Ampoid guitar amp showcase

I believe that the most common form of this connector is actually a stereo NC type of connector, in which the circuit "breaks" when the plug is inserted in

6.3mm female stereo jack
Switched female jack diagram

Is there a way in which I can achieve the desired functionality with a NC female 6.3mm (1/4") connector?, that is: making the 9V battery power on the circuit when a male mono plug is inserted on the switched female connector

I have looked at this article by Brian Smoot on CUI Devices a few times but it explains it in terms of stereo connectors and I get confused.

One Answer

If you are using mono 1/4 inch phone plugs, you can use a stereo jack (no switch contacts needed on the jack).

Connect the ground side of the battery to the ring terminal of the jack rather than to Ground. When you insert the plug, the ring contact of the jack will touch the sleeve of the plug, completing the battery connection to Ground.

Answered by Peter Bennett on March 2, 2021

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