This 2-bit adder was a lot of work to build ... It’s a rather unorthodox use of the part, depending more on the chip as an inverter and taking advantage of the fact that there’s an NPN ...

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 ...

However, this simple adder should give you a good idea of how ... in some cases, half of a chip's physical pins are dedicated solely to power or ground. Some chips may draw more than 150 amps ...