I am planning to connect the an old 70s phone speaker and mic, each of which have two wires which end in a spade.
to this 'earphone socket'
This is the cable I'll be using to connect the two, it has three pairs of prestripped wires, red, white, and yellow
Here is a schematic of the board the jack is connected to, it isn't too clear but I think the jack is at the bottom middle, underneath the sim900 chip.
I assume I can simply connect the two wires of one color to the two wires of a device? What colors would I use? Is there any polarity issues to worry about? ie positive and negative ends? Any risk of damage ie from the devices drawing too much current?