We have found a new home! Looking for Latest Electronics Project Kits? Triggering Methods This article explains the basic pulse ripple counters ppt methods like HIGH Level Triggering, LOW Level Triggering, POSITIVE edge triggering and NEGATIVE edge triggering with the help of symbolic representation.
The basic principle of clock pulse transition is also explained. To know the basics of flip flops and its different types click on the link below. After going through my post on flip flop, you must have understood the importance of triggering a flip flop. The output of a flip flop can be changed by bring a small change in the input signal. This small change can be brought with the help of a clock pulse or commonly known as a trigger pulse. When such a trigger pulse is applied to the input, the output changes and thus the flip flop is said to be triggered. 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. And these sequential circuits require trigger pulses. The number of trigger pulses that is applied to the input of the circuit determines the number in a counter. A single pulse makes the bit move one position, when it is applied onto a register that stores multi-bit data.
In the case of SR Flip Flops, the change in signal level decides the type of trigger that is to be given to the input. But the original level must be regained before giving a second pulse to the circuit. If a clock pulse is given to the input of the flip flop at the same time when the output of the flip flop is changing, it may cause instability to the circuit. The reason for this instability is the feedback that is given from the output combinational circuit to the memory elements. This problem can be solved to a certain level by making the flip flop more sensitive to the pulse transition rather than the pulse duration.