At the next level, the Invert circuit created earlier can be used. In this way, create a new circuit with the NAND gate, and then use that circuit ... circuit can perform binary addition of ...

To demonstrate how computers work, [Alex Gorischek] has made a physical example of how binary logic gates work using pulleys and ... This includes: NOT, BUFFER, NAND, AND, OR, NOR, XOR, XNOR.