There are some instances that our circuit counted two times. for instace we pressed our button but it sometimes skip numbers, is there something im missing? btw i used push buttons that are NC for the counter and it is connected to the GND instead of VCC.

 

Yes, you need to debounce the button.

http://www.labbookpages.co.uk/electronics/debounce.html

https://programmingelectronics.com/tutorial-19-debouncing-a-button-with-arduino-old-version/

https://www.google.com/url?sa=t&rct...bouncing.pdf&usg=AOvVaw3qazCEfIuneL1JnEYaXo01

Are you doing this all with discrete logic ? There are UPs available that have debounce, count,
decode capability in them.......

Regards, Dana.

 

MOD NOTE: Please, only one thread per topic.

You already have another one:

https://forum.allaboutcircuits.com/...r-using-74ls192-and-7447.148765/#post-1269918