Intro: DIY Remote Shutter for DSLR Cameras With a Pair of Earphones
In the video you can see the step-by-step process:
You need earphones and scissors: this tutorial is valid only for cameras that have a 2.5mm jack entrance. You can use either 2.5mm jack earphones or an adapter.
You have to cut only one of the earphone cables, if you use the two of them it will not work.
Let me know if you have questions!