# 2 Digit Simple CD4026 Digital Counter circuit

Do you want a digital counter circuit? How to be easy and economical? Use CD4026 with this project. You will smile. They the main parts can display with LED 7 segment 0-99 number or two digits Digit counter. There is a reset button to restart. It can be applied to a lot of your projects.

For example, counting products, counting people into the library, and more.

Let’s find out more!

## The working principle

As the circuit below. The IC1, IC2-CD4026 (CMOS Counters Decade/Divider / Integrated Circuit). I like this IC. Because they can drive LED 7 segment directly.

Recommended: 0-99 counter using TTL 74LS48, 74LS90

Which they connected together.

• IC1 is a unit counter IC.
• IC2 is a ten-digit counter.

And both ICs will work at Rising edged CLOCK only.

What is more?

The input signal will be connected to pin 1 of IC1. Then, the signal will go out to pin 5 of IC2. To send a next digit sequence.

Reset Mode
We connect both pin 15 of ICs together to reset pins. When you want to restart to the zero 00 again.

The working this IN point will must to connect to center point. By this point need to provide a positive voltage lower than 2 volts.

When there are input signal come in, lower voltage than 2 volts. The voltage will sent to D1, R1 in to base of TR1, TR1 so conduct current, when TR1 conduct current TR2 also will conduct current by bias current through R2 and pin 1 of IC1 will have CLOCK feed to IC1 will begin count 0 again.

When input signal into a continuous, IC1 will count indefinitely. When CLOCK signal into a 10 cycle. Which will count the number 9, then it changes to a new number 0. This at the same time will send signal out off pin 5 and will send to pin 1 of IC2,

IC2 is ten digit counter, will start at “1” You will maintain this state indefinitely, until IC1 count of 0-9. Signal at pin 5 of IC1 sends a signal to Pin 1 of IC2 again. IC2 also goes into counting second. And maintain this state indefinitely, again until IC1 to count from 0-9. Will be output at pin 5 of IC1, send it to pin 1 of IC2.

IC2 also goes into counting third, the work will be to look like this again.
Which from the circuit of Figure 1 to counting maximum of 99 only.

If I need to count more than this, it can be connected to it.
If you want to make a new start, press RESET. Number is the 00 and if input signal in to this will start counts new again.

Here are a couple of related articles you should read, too:

## How to build

This is the actual-size of Single-sided Copper PCB layout and components layout of this project.

You solder all components on the PCB and wiring.

Check out these related articles, too:

## Testing and application

When we build them done as Figure below. Connect the battery or AC adapter 6-12 volts. Positive to the positive terminal And the negative pole to the G.

Now at LED 7 segment DISPLAY indicate as number 00. But if is others number to press reset switch at DISPLAY will show is 00, then test press TEST switch at DISPLAY will show 01, 02, 03 continue to 99. Then return to 00. The pressing switch continues.
If to make the switch back to 00, press RESET switch. When tested as follows show that this circuit can operate normally.

Note:
You can buy parts at amazon here:

CD4026 on Amazon.com

Not only that you can read:

Digital counter circuit using CD4510 & CD4543

## GET UPDATE VIA EMAIL

I always try to make Electronics Learning Easy.

Get Ebook: Simple Electronics Vol.4

### 19 thoughts on “2 Digit Simple CD4026 Digital Counter circuit”

1. how so that the circuit can be used up and down counter (for score board).

2. Hola señores que tenga un feliz día
Me gusta la pagina muchos los proyectos me gustaría los proyectos con pics microcontraladores de la micro chip.
Gracias Oscar.

3. hello again.

is C5 and C6 1u/16v or 0.1u/16v?

thanks.

4. also, is the transistor “458” or “548”? I can’t find any 458s…
thanks.

5. Hi alex morfe,
You can use 0.1uf or 1uF any type electrolytic or ceramic.

6. Hi, can you movie the counter up or down? Like increase the number and go back if you want to decrease the number?

7. What transistor could possibly an alternative to c458

8. Hi Joel,
You can use C828,C1815.

9. I can’t find IC CD4026 . Is there any possible IC I can use? Instead of CD 4026.

10. Hi friend
Can you tell me what type of segment can i use? Common cathode or Anode?
The BZ 505 type work with circuit?
Thanks
Andreas

11. i have a 10 pin dual 7 segment display can i use this circuit with this kind of display or do i need an 18 pin dual 7 segment display

12. Hi,I check your new stuff named “2 Digit Simple digital counter circuit using CD4026” regularly.Your story-telling style is witty, keep doing what you’re doing! And you can look our website about proxy server list.

13. Hello ca we change the switch as a photodiode? Thank you

• Hi,
Yes, You can test it. You may change some components like R1.

Have a good day. Fun with Digital learning.

14. ```4026 Last counting on power off this counter circuit becomes zero.
```
• Hello laxmikant patel,
Thanks for your visit. I am happy that you are interested in this circuit.
My English is quite poor. Do you mean reset to Zero when turning on?
You may add 1uF to the beginning of C1. It acts like a reset switch on. This will reset the system to zero.

If you test it. There are anythings results. Please share again.
Thanks
Apichet