Addition per impulse count and push register
Fine solution
Select first number to be added and press LOAD.
The selected number shows up in the first green display .
The 555 sends exact the amount of impulses you selected to the DOWN counter.
The logic gates make it stop at > 0 <
Select another number and press LOAD again.
Same procedure as last...
Regard the first number moved to the second green display and the second number shows up in the first green display.
The red one shows the result as soon as the counter finished.
Enjoy
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