7-Segment Counter Display using IC CD4033

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7 segment counter display is a project that many electronic projects use to display the number count of their output. The circuit involves the use of an IC with a segment display, transistors, and a combination of resistors and capacitors.

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Hardware Components

The following components are required to make 7-Segment Counter Display Circuit

S.no	Component	Value	Qty
1.	IC	CD4033	1
2.	7 Segment Display	LT543	1
3.	Transistor	2N4401, 2N4403	2
4.	Electrolytic Capacitor	47µF	1
5.	Diode	1N4148	1
6.	Battery	5V	1
7.	Variable Resistor	100KΩ	1
8.	Resistors	510Ω, 1KΩ , 5.1KΩ , 47KΩ, 180KΩ	1,2,2,1,1

CD4033 Pinout

For a detailed description of pinout, dimension features, and specifications download the datasheet of CD4033

2N4403 Pinout

For a detailed description of pinout, dimension features, and specifications download the datasheet of 2N4403

7-Segment Counter Display Circuit

Working Explanation

The circuit works in two stages. First, the part of the transistor, and second, the IC and display part. The part of transistors includes the use of both the PNP and NPN transistors. The two NPN transistors together produce continuous pulses, each working in contrast to the other. If one transistor produces a positive then the other provides a negative pulse. Therefore, the clock input PIN 01 of the IC goes 0 and 1, respectively.

IC CD4033 is a decade counter IC that functions and outputs numbers on 7 segment display LT543. The IC works such that each positive pulse at the input of the IC advances the output of the IC by count one. Furthermore, a high RESET signal clears the decade counter to its zero counts. The seven decoded outputs (a, b, c, d, e, f, g) produces proper segments with a pattern, thus, representing the decimal numbers from 0 to 9 on the 7-segment display.

The operating voltage of the circuit is 5V. 100KΩ variable resistor in the circuit adjusts the speed of the display on the 7-segment display. Moreover, the diode 1N4148 prevents the circuit to operate in negative polarity.