13-05-2011, 04:45 PM
Name– study of half adder logic circuit.
Aim – to study the working of half adder for two binary digits addition.
Apparatus – IC 7408, IC 7486, circuit board, LEDs, power supply +5V DC, connecting wires, soldering iron, cutter etc.
Circuit diagram
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Procedure –
1) Solder the circuit on the given board.
2) Connect respective pins of each gate to the corresponding pins of other gate.
3) Connect the outputs ‘sum’ and ‘carry’ to two LEDs.
4) Apply different combinations of inputs as per truth table and note down the corresponding change in the outputs of the circuit.
5) Tabulate the readings.
Brief theory – half adder is logic circuit, which can add two binary digits at a time. In half adder, there are two inputs A & B with two outputs SUM and CARRY. The SUM is the output of Ex-OR gate and CARRY is the output of AND gate.
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