I decided to take apart controllers too, so i started with a Ps1/Ps2 controller. I recognised pretty much all the components to this controller, as well as in the Gamecube and super nintendo controllers.
Ps1 controller
Back of controller board
Button layout
Analog input, this is just a small piece of plastic that can move 360 degrees, if you click in the analog sticks you press a small basic button .
Back of controller board
Small motor, for rumble feature
Philip Hampson 