Uploaded May 2014 | Updated September 2026, 3 hours ago

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Using an instant NOT-Gate designed by TT Lemon and a very compact instant repeater by Sidney600MC, I created an instant full-adder, and linked 4 of them together to form an instant 4-bit adder.

TT Lemon's NOT Gate: youtube.com/watch?v=L338E9dL1YE
Sidney600MC's Repeater: youtube.com/watch?v=l5kSVJnWpgw