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Ascending counter circuit composed of four IC’s (NAND gate 7400 , 74LS191N ,74LS190P
, 7447AN)
The first stage is composed of oscillator generates the base clock to the counter first,
the counter first the frequency division inside stages
composed on the basis of the speed of counting , the second counter will count the final
and conducting the count to a decoder which is based viewing on a screen
these stages The four possible shortened It's possible to change the speed of the count
by changing the position on the basis that the count be either fast or slow depending
ranked entered by the counter and turn it into a possible counter descending
or ascending through the last meter reading and the potential that the countdown ascending
or descending