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

Here's another octal counter whose outputs (Q0 - Q2) light up LEDs and are also displayed in decimal numbers on the LED display.

As you'll see in the schematic for this project, an astable multivibrator made up of two NAND gates generates the clock pulses to count.

The outputs of the counter, Q0 -Q2, are decoded by the decoder IC and displayed on the LED display.

When you finish assembling, turn power ON.

You'll notice that the LED display begins displaying the numbers from 1 to 2, 3.. and so on up to 7, and returns to 0 and repeats this counting operation over and over again.