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Let me state from the very beginning that this logic simulator is not perfect. For example, you cannot save your work. But if you have something simple you need to demonstrate or try out, it is nice and simple:
The circuit shown above is a full adder. The two left hand switches are the two input bits, and the upper switch is carry-in. The upper light bulb is the sum, and the lower is carry out.
If this had a couple of extra features like saving and block copy/paste, it would be awesome.
See also: How digital clocks work
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