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DIGITAL COUNTING CIRCUIT A simple Digital counting circuit, which will counts from 00 to 99. The counter will incremented by one for each pulse given in the terminal A and B. The pulse can be given by just short circuiting the end points A and B. You can use this circuit for a wide variety of applications such as, for Digital Entry Counter, Speedometer circuit, distance measuring devices etc. CIRCUIT DIAGRAM WORKING PRINCIPLE The 555 timer is wired as an ASTABLE MULTIVIBRATOR, which will generate an output for each pulse given in the terminal A and B. The output is taken from pin 3 and is directly given to the clock input (1) of decoding IC CD4033. CD 4033 is used here as 7 segment Display Driver. The Cout from this IC is given to another CD4033 IC. Which will drive another 7 segment Display. The 7 segment display used here is of Common Cathode type. So the pin 3 is connected to ground. You can increase the number of bits to count in this circuit (99999......) Other useful Links:- INTE...

Binary numbers Logic states  True  False 1 0 High Low +Vs 0V On Off   Seen on a T-shirt: There are 10 kinds of people - those who understand binary, and those who don't. Electronic circuits count in binary. This is the simplest possible counting system because it uses just two digits, 0 and 1, exactly like logic signals where 0 represents false and 1 represents true. The terms low and high are also used for 0 and 1 respectively as shown in the table. Counting  one ,  two ,  three ,  four ,  five  in binary: 1, 10, 11, 100, 101. Binary numbers rapidly become very long as the count increases and this makes them difficult for us to read at a glance. Fortunately it is rarely necessary to read more than 4 binary digits at a time in counting circuits. In a binary number each digit represents a multiple of two (1, 2, 4, 8, 16 etc), in the same way that each digit in decimal represents a multiple of ten (1, 10, 100, 1000 etc)...