Half Adder

University of the East
College of Engineering
Electronics and Communications Engineering Department

Experiment 5:

ADDERS

Lugtu ,John Kelly S.
20081107280
Grade

Engr. Oliver G. Daiton
Instructor

EXPERIMENT NO. 5
ADDERS
OBJECTIVES

1. To verify the operations of a half adder and a full adder.
2. To determine the differences between the half adder and full adder.
3. To study the operation of full adder MSI IC.

SKILLS REQUIRED

For the experiment to proceed smoothly, the student must be

1. Familiar with logic gates.
2. Familiar with addition of binary numbers

MATERIALS AND EQUIPMENTS NEEDED

Logic Trainer or breadboard Logic ICs: 7486, 7408, 7432, 7483 Connecting wires Long nose pliers Optional: Dc power supply LED’s

PROCEDURES

PART A. HALF ADDER

Step 1. Connect the circuit as shown in figure 1.

Figure 1. Half Adder Circuit

Step 2. Apply the input combinations given table 1 and observe the output. Which LED represents the SUM and which LED represents the CARRY?

Table 1

SW1
SW2
LED1
LED2
0
0

0
1

1
0

1
1

Step 3. Turn off power and disconnect all wires. Remove the ICs.

PART B. FULL ADDER CIRCUIT

Step 1. Connect the full-adder circuit shown in figure 2 using the necessary IC.

Figure 2. Full Adder Circuit

Step 2. Apply the input combinations given table 1 and observe the output. Which LED represents the SUM and which LED represents the CARRY?

Table 2

SW 1
SW 2
SW 3
LED 1
LED 2
0
0
0

0
0
1

0
1
0

0
1
1

1
0
0

1
0
1

1
1
0

1
1
1

Step 3. Turn off power and disconnect all wires and remove ICs.

PART C. MSI ADDER CIRCUIT

Part B. MSI full adder

Step 1. Turn the power of trainer off.

Step 2. Wire the 74LS83 as shown in figure 3. Use the data switches for the input signals and the LED for the indicators

Figure 3.