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And these sequential circuits require trigger pulses. Flip flops are applicable in designing counters or registers which stores data in the form of multi-bit numbers.But such registers need a group of flip flops connected to each other as sequential circuits. When such a trigger pulse is applied to the input, the output changes and thus the flip flop is said to be triggered. This small change can be brought with the help of a clock pulse or commonly known as a trigger pulse. The output of a flip flop can be changed by bring a small change in the input signal. TAKE A LOOK : MASTER-SLAVE FLIP FLOP CIRCUITĪfter going through my post on flip flop, you must have understood the importance of triggering a flip flop. To know the basics of flip flops and its different types click on the link below. The basic principle of clock pulse transition is also explained. This article explains the basic pulse triggering methods like HIGH Level Triggering, LOW Level Triggering, POSITIVE edge triggering and NEGATIVE edge triggering with the help of symbolic representation.