Lab Digital Circuit

Objective: To connect digital circuits to obtain its truth table Equipments and components: 1. Resistor : 300Ω 2. Gates : 2-input OR (7432), 2-input NAND (7400), 2-input EXOR (7486) and INV (7404) 3. Breadboard 4. DC Voltage supply 5. Multimeter 6. Connecting wires 7. LEDs Procedures and Results: a) OR gate circuit 1. Assemble circuit as diagram on breadboard. 2. Connect an LED at the output 3. Switch on the DC power supply and supply input voltage of +5V on IC 7432 4. Connect A and B as in table below and observe LED. Complete the table. A(V) 0 0 5 5

B(V) 0 5 0 5

LED OFF ON ON ON

5. Determine the exact bandwidth (values) of voltages that represent logic 1 and logic 0 by adjusting the values. 6. Give conclusion from this experiment.

b) NAND gate circuit 1. Assemble circuit as diagram on breadboard. 2. Switch on the DC power supply and supply input voltage of +5V on IC 7400 3. Connect A and B as in table below and observe LED. Complete the table. A(V) 0 0 5 5

B(V) 0 5 0 5

LED ON ON ON OFF

4. Give conclusion from this experiment. c) Map Logic Function 1. Assemble circuit as diagram on breadboard. 2. Switch on the DC power supply and supply input voltage of +5V on IC 7400 3. Connect A, B, C and D as in table below and obtain output Z (the output F (A,B,C,D)). Complete the table. A 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1

B 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1

C 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1

D 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1

Z 1 1 0 0 1 1 0 0 1 1 0 0 1 0 1 1

4. Write down the function of F (A,B,C,D). Determine whether it can simplify further. 5. Give conclusion from this experiment.

Suggestions for further work in the future: 1. Prepare the electrical and electronic components which in good condition. 2. Do not use red maker while writing on the whiteboard because it is unclear. 3. Use LCD projector to show how to do the experiment. 4. Use microphone to give the explanation.

Conclusions:

References: 1. J. David Irwin, Basic Engineering Circuit Analysis, (7th Edition), John Wiley and

Sons Inc,2002 2. David E. Johnson, John L. Hilburn, Johnny R. Johnson, Peter D. Scott, Basic

Electric Circuit Analysis, (5th Edition), Prentice Hall, 1995 3. Robert J. Herrick, DC/AC Circuits and Electronics: Principles & Applications, Theorem Delwan Learning, New York, 2003 4. Thomas L. Floyd, Principles Of Electric Circuits: Electron Flow Version, (3rd

Edition), Macmillan Publishing Company, New York, 1993 5. Thomas L. Floyd, Principles Of Electric Circuits: Conventional Current Versions,

(8th Edition), Pearson Prentice Hall, New Jersey, 2007