BCD counter with display
Electronic
74HC00, 74HC191, 74HC4511

In this project, we compare the BCD (binary coded decimal) display on the LEDs with the decimal display on the LED display. A slow clock pulse is counted by the counter IC.

As you can see in the schematic, U2 is used to generate the clock pulses, U1 is the counter IC, and U3 works as a decoder which displays decimal number on the LED display.

Assemble the project and turn power ON. At this time, the LED display shows "0". When the clock pulses are generated, it starts counting from 1 to 2,3,4.... an so on, as shown in Figure 1, and at the same time LED 1 - LED 4 begin blinking ON and OFF.

Can you see the relationship between the four LEDs and the LED display?

Look at Figure 1. It helps you understand the relationship.