This is a custom tutorial for making your own RCA (aux cable) to TRS end (the same on on your headphone jack).
Why make this? - you can hook up your mp3 or laptop to your surround sound system.
Okay! so let's get started
Why not just buy it in store? - You are always free to do so, but in some regions it is hard to find stores that will sell these types of things, especially if you live in a less urban area. Some stores also can charge a fairly large amount of money for such an easy project. Plus this is really fun and you can feel proud you did something.
Step 1: Get a regular RCA to RCA cable
An aux cable works well too, just the yellow end should be unused since it is for video, and we're dealing with audio.
The next thing you will need is a 3.5 mm jack. I got this by trimming the end off my broken headphones with scissors.
Step 3: Strip the wire off the large protective casing
You can do this with a wire stripper, but scissors works perfectly well.
Now once it is stripped you should have two wires, a white and red one along with some copper wire hanging out from each
Step 5: Strip the red and black wire so that it is exposed
This should expose the copper wire from inside the colored wires
Step 6: Sodering
If you have a special TRS casing then continue with this step. If you do not, then do the next step only.
In the picture above is a 3.5 mm jack. What you must do if you have this jack is the solder the white wire to the center of the jack, the red to the outer more larger side, and join the two other copper wires to each other and solder it to the longest sleeve of the jack. Refer to the picture for more help.