Replacing the Jack on a Pair of Headphones: 7 Steps (with Parts and Tools. Along with the fairly standard soldering iron, a new jack, and such, there's a few Understanding the Jack. Most Jacks comprise of 2-3 parts. A cover/Sleeve which screws into the Stripping the Wire and Insulation. If you have an excessively long wire, you can crop it at this point. Cleanse It With Fire. You should end up with 2 copper coloured standed wires, one red, and one See all full list on instructables How to Hack a Headphone Jack - Circuit Basics One of the most versatile ways to do that is to use a 3.5 mm stereo audio jack. These can be salvaged from an old set of portable audio headphones. If you cut off the ear buds, you can plug the jack into an audio source and connect the wires directly to your circuits.