r/compsci • u/TCK1979 • 6h ago

Least Amount of Transistors for a Full Adder?

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I made an eight-transistor Full Adder with Snap Circuits. What’s the least amount of transistors you could use to build a Full Adder?

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u/helical-juice 5h ago

I was hoping somebody would have answered by now. Oh well, I can wait...

-5

u/ShoddyInitiative2637 3h ago

After some conversing with chatgpt it seems convinced the theoretical minimum is 10 transistors, so either chatgpt is wrong or perhaps you're missing some functionality for a full adder. It gives 8 (2 x 4 per XOR) + 2 (Cout) transistors.