North Park Secondary School

Computer Engineering 11 (ICE 3M0)

Experiment 12

Digital Lab 12

Binary Addition - half adder


Teacher's Name

Student's Name

Student No.

PURPOSE:

To investigate a circuit which simulates addition of 2 binary digits.

Materials

One SK-50 breadboarding socket
One 7486 TTL integrated circuit
One 7408 TTL integrated circuit
Two 470 OHM resistors
Two LED's
Seven Wires
One 9V Battery


Curcuit


PROCEDURE:

  1. Assemble the circuit on the breadboard. (Note pins 1 and 2 are at 5 volts when they are not connected)(Note: In the schematic above if 2 wires are crossed but don't have a large dot, then the wires are not connected. BUT if the wires do have a large dot at the intersection then that means they have to be connected on the breadboard!)
  2. Observe LED 1 and LED 2 for steps (3) to (6)
  3. Connect input A and B to be both high
  4. Connect A as high and B as low
  5. Connect A as low and B as high
  6. Connect both A and B as low

OBSERVATIONS

Output 1 Output 2
Input A Input B Output Output
High High
High Low
Low High
Low Low


DISCUSSION

  1. Review the results in chart form of the four cases for adding 2 binary digits.
  2. Compare question 1 with the observations in this experiment.
  3. When 2 digits are added a sum and a carry are obtained. For example 1 + 0 has a sum of 1 and a carry of 0. How should the LED outputs in this experiment be interpreted?
  4. When any 2 numbers with more than 1 digit per number are added, the addition at any place value requires the addition of 2 digit per number are added, the addition at any place value requires the addition of 2 digits from the present place value plus the carry from the previous place value. For example:

    Our Circuit will simulate case A. Describe a circuit to simulate case B.

CONCLUSION

Summarize the circuit requirements to add 2 binary digits.


Page Lasted Updated 1:12 PM 9/20/2003

 

OPTION MENU

Top of Page

 

Assignment Menu

 

 

TIK2O
Course Rationale

Download Quizzer 2000
  Home Package

   

Back to TIK2O
Home Page

Back to the
Virtual Classroom

FOR MORE INFORMATION -  Contact your Instructor