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Precisely, your circuit can't get to any stable state while your add button is pressed down.

Hi, First of all if you have not yet read about the oscillation please read it here: https://logiccircuit.org/oscillation.html In your circuit you are using flip-flops with clock that is working by level. So when the Add button is pressed each flip-flop is storing the data its receiving on it’s inpu...

You can build such component yourself. Just create new circuit, put 1x1 let matrix, make needed connection and mark the circuit as Display. You will have any color LED.

As I mentioned it's already implemented. For practical use please see this topic:
viewtopic.php?f=3&t=9789&p=9661&hilit=traffic#p9661

You did not mention the countdown display before. The shift register is for controlling the traffic light itself. The countdown is different story. For more specific discussion please attach your project and provide better description of what you are trying to build.

Why do you need down counter? For traffic light you will need a shift register for 3 bits. During the initialization you will set one bit to 1 and other two to 0. Then each clock input shift and cycle the last bit to the first. To send a clock signal to the shift you need to divide frequency with a ...

Hi Wolfgang,
No there is no other way to copy. What is wrong with copy/paste?
Regards,
Eugene

Nice progress. It will be easier for you if you start to wrap up chunks in separate circuits. With smaller circuits you don't need wire highlights and much easier debug and navigate.
Keep it up

On the properties of the circuit you have "Category" field. Use it for grouping.
For more information on features please look at the help pages: https://logiccircuit.org/help.html

Take it to the moon.