N Indicator-switches connected for one of N selection by N wires

摘要

Any number N of light emitting diode (LED) push-button indicator-switches are connected by one wire each to a corresponding N interconnected assemblages of four cross-coupled logical elements each. A pushbutton activated signal input through a one connective wire causes a cross-coupled flip-flop storage action within the associated assemblage which will maintain the L.E.D. lit by outputting on the selfsame connective wire after the pushbutton is released. A one-shot circuit merged in each assemblage clears via the interconnect the stored signals of all other assemblages when a new pushbutton signal is activated. One of N selections between N indicator switches is thusly obtained with only one wire connection to each.