D-type flip=flop with input controlled by pushbutton - has flip=flop input connected through three differentiating circuits to logic switching elements

摘要

The flip-flop has only two logic switching elements (16, 17). Each of the logic elements is connected to a differentiating circuit (12, 13) whose outputs are connected through a third differentiating circuit (4) to the flip-flop input (1). There are switching elements or diodes (22, 25) which block one or the other differentiating circuits (12, 13) in accordance with the logic state of the flip-flop. Typically NAND gates may be used for the logic elements (16, 17). Alternatively NOR gates or inverter switching networks may be used.