Next you will install the IC socket, also known as a CPU socket. IC sockets use a mechanical connection to connect a processor to a printed circuit board. These sockets allows the processor to be easily replaced without the risk of damage associated with soldering processors directly to a circuit board.

Stick the eight leads of the IC socket through the holes in the rectangle marked IC1. Make sure that the semi-circle on the top of the socket lines up with the semi-circle printed on the edge of the rectangle on the circuit board.

Turn the board over and solder the eight leads of the IC socket to the board. Similar to soldering the buttons, there is no need to trim any excess off the leads.