Seven Segment Counter Display Circuit
Here is the circuit diagram of a seven segment counter based on the counter IC CD 4033. This circuit can be used in conjunction with various circuits where a counter to display the progress adds some more attraction.
In this circuit a 7-segment display is connected with two NE555 IC’s and CD4033 IC to display counts from 0 to 9. The IC CD40333 is a 5 stage Johnson decade counter with decoder and is mostly used in digital displays. The decoder helps in converting the Johnson codeto a 7 segment decoded output. Thus, the input signal will be converted to numeric digits and will be displayed on the LT543 display. This IC can be used in display circuits and also in clocks, timers and so on.
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This IC can be operated at a maximum of 20 Volts. While using the IC make sure that you use it alternatively, as it is highly sensitive to static change, and a small touch at the input terminal would be more than enough to start the counter circuit.
IC CD4033 Pinout Diagram
IC NE 555 is wired as an astable multivibrator for triggering the CD4033 IC on Clock Input Pin (Pin 1). For each pulse the out put of CD 4033 advances by one count. The output of CD 4033 is displayed by the seven segment LED display LT543.
Pins 2, 3, 8 & 14 are grounded. Pin 2 is the Clock Inhibit pin and should be grounded while the counter is incremented by one value for each pulse. Pins 3 & 4 are the ripple blanking input & output pins. They are used to improve the readability of the digits. Pin 8 is the GND pin. Pin 14 is the Lamp Test pin and is used to check if all the seven segments are properly working.
Pin 16 is the Power pin and should be connected to the 5V DC supply.
Pin 5 is the Carry Out pin and as the name says it carries out a 10 clock input cycle (0 to 9). It can be used to cascade more IC’s to display more digits.
Pin 6, 7, 9, 10, 11, 12 & 13 – These 7 pins are the 7 decoded outputs from a to g and produces the output digits (0 to 9) on the display.
Pin 15 is the Reset pin and must be kept LOW to reset the counter from 9 to 0.
Switch S1 is used to initiate the counting. As soon as the switch S1 is pressed, the clock input pin receives the pulse and increments the counter by 1. After counting till 9 the display again shows 0.
Diode D1 prevents the risk of accidental polarity reversal.
Seven Segment Circuit Diagram with Parts List
Displaying 2 Digits (10 to 99)
Using 2 CD4033 IC’s can help you count 2 digit numbers from 10 to 99. The two IC’s have to be cascaded with PIN5 connected to carry out the count from 9 to 10 in the second IC. Make sure to connect PIN 15 (Reset) of both IC’s together & ground it with a 47K resistor. You can add more digits by cascading more IC’s.
Some circuits that you may like to see. 1. Static 0 to 9 Display 2. Up/Down Counter Circuit 3. Digital Timer Circuit 4. Long Duration Timer Circuit 5. Scoring Game Circuit