Learn how computers add numbers and build a 4 bit adder circuit
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Last Updated: September 28, 2026
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Summary
Lepton's entry into the Google Science Fair; The A working physical version of the I attempt to explain how binary numbers (0's and 1's) are added by the ALU, a component of the CPU using the At the National Museum of Computing I found a wooden device that demonstrates counting in NOTE: The schematics incorrectly show the NPN transistors in reverse, with collector / emitter swapped. This is my first attempt at ... This run fills up the queues on the gates (AND,XOR) and collects the left over marbles when adding several 1bits. Here we just ...