อุปกรณ์รวมส่งสัญญาณ

Also known as mux, data selector

thumb|300px|Schematic of a 2-to-1 multiplexer. It can be equated to a controlled switch. thumb|270px|Schematic of a 1-to-2 demultiplexer. Like a multiplexer, it can be equated to a controlled switch.