SOLVED: What wire colors are in the TRRS 3 jack What wire colors are in the TRRS 3.5mm jack? I have 4 colours in the earphne blue red green n copper wire n 4 slots in the mic mentioned as M,R,L,e where do I stick which colour. by Biswajeet Rai. Help Translate iFixit 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. Related searches for 4 pole 3 5MM jack wiring 4 pole 3 jack3 5 pole jack4 pole 3 stereo jack3 4 pole jack replacement4 pole 3 audio jack4 pole 33 4 pole plug4 pole 3 cable