An elementary electronic circuit in the arithmetic logic unit (ALU) of the CPU that adds one bit to another. The output of the half-adder is a result of 0 or 1 and a carry of 0 or 1. Additional ...

Instead of going with silicon-based switching (ie: transistors) this 4-bit adder uses mechanical relays. We like it for its mess of wires (don’t miss the “assembly” page which is arguably ...

[Nakazoto] built a 10-bit binary adder with relays. The build is designed from the ground up, including the PCBs, which are milled using a CNC machine. There are six boards: the input board ...