A multiplexer is a component with many inputs and one output. We call it a MUX for short. It is an essential component in almost all large electronic systems.
The MUX is basically a selector switch, as I show in Figure 12.1.
The selector switch or the rotary switch on the left selects which of the four inputs I want to connect to the output, O. I show the schematic symbol of an electronic multiplexer on the right. In addition to the four inputs and the output, the symbol has two other inputs, the control inputs a and b, which determine the position of the switch arm and selects which of the inputs goes to the output.
Figure 12.1 A MUX selects one of the many inputs, like a rotary switch. The symbol for a MUX is on the right.
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