12 volts to the audio jack: is it worth the task, and how to prevent it?

Question

Do it yourself

I repaired the speakers and generally work. But laziness, as you know, is the engine of progress, and I came up with another improvement.
I have a homemade speaker-headphone switch, and one group at the jack switch is idle. Let this group switch 12 volts, and a small relay turns on the speakers when the switch is flipped. Simple and stupid, only two questions remain: price and foolproofness. Everything is clear with the price: you need to look for which device to take as a basis.
I wanted to ask about foolproofness. On the back of the computer, next to the audio jacks, there will be a female connector, and it has 12 volts. How to make sure that even a foolishly stuck audio jack does not come into contact with high voltage? What are the suitable connectors? Or is this task not worth it, and if you poke an audio jack there, nothing will happen to the speakers?

Answer 1

In general, the decision was worked out by common forces.
Some "mother" D-Sub.

Answer 2

Speakers usually have decoupling capacitors at the input, so the 12V applied to the audio jack will produce nothing but a loud click in the speakers. Now, if you put the headphones in there, they can burn out. For complete foolproofness, use special power connectors: https://habrastorage.org/files/745/cc2/4dc/745cc24...

Answer 3

If I understand correctly, you have a headphone jack on the speakers.
And you want to switch between them and columns.
I would recommend replacing the connector (jack) with the same jack, only with extra. contacts.
You plug in the headphones, the connector contacts mechanically break the sound circuit to the speakers, and connect the headphones.

Answer 4

for 12 volts, install any other connector into which a 3.5 jack cannot be plugged