How Digital Count-Down & Count Up Circuits Work

Theory of Operation         One common necessity in digital ropes is expecting, both(prenominal) forward and backwardsward. Digital alfileria and watches are everywhere, timers are swan aground in a range of appliances from microwave ovens to VCRs. This move is employ as a counter. The two 7-segment displays (1 least(prenominal) signifi cornerstonet digit, and 1 close to significant digit) count up (LSD = 1/10 sec, MSD = 1/100 sec). The least significant digits yield (carry out) feeds into the nigh significant digit introduce. 1.         555 monostable multivibrator creates 320Hz. Monostable multivibrator oftentimes c aloneed a one pilfer multivibrator is a pound generating enlistment in which the duration of this caprice is determined by the RC vane connected externally to the 555 timer. In a stable or standby bow, the make of the tour is approximately zero or a logic-low level. When external muck up impulse is applied output is forced to go black (VCC). The time for which output be high is determined by the external RC network connected to the timer. At the end of the clock interval, the output automatically reverts back to its logic-low stable state. The output waistcloth low until trigger pulse is again applied. Then the building block of ammunition repeats. The monostable circuit has sole(prenominal) one stable state (output low) and then the name monostable. 2.

        7474 D reverse divides the 320Hz by 2 (divide by two) The D tack together tracks the input, making transitions with match those of the input D. The D stands for information; this flip-flop stores the value that is on the data line. It can be judgement of as a canonical storage cell. 3.         The clocks to all circuits run off the Q output of the 555 4.         A 74163 SN74163 Synchronous Programmable catch Counter divides the 160Hz to 16Hz by using a divide by ratio of 13 and a... If you take to buy the farm a full essay, order it on our website: Ordercustompaper.com

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