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Combination Logic Tutorial

The Full Adder Tutorial

Full Adder Diagram

The full adder is made with two half adders.

A CARRY OUT from a previous addition can be added to the bits A and B by means of the CARRY IN.

Draw a truth table, with A, B and CARRY IN as inputs, and SUM and CARRY OUT as outputs.

There is a more detailed description of operation on the page A 3 BIT ADDER.

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