PROJECT 02 – YOUR FIRST LOGIC GATE

OVERVIEW

In this circuit, you will connect your first logic gate and demonstrate how it works.

BEFORE STARTING

Be sure a resistor is placed in series with the LED.

Be sure to use a 5V voltage regulator.

If the LED doesn’t light up, it might be connected backwards.

Be sure that you can read the numbers on your IC.

Check out the resource section on the index page for the pinouts of the ICs that we use.

PART 1

Create the following circuit. You will use a 7408 TTL chip. It requires that you use a voltage regulator. Have an LED show whether the output is 0 or 1.

You will have to show your circuit to your teacher. You will have to show what the output Q is for all possible values of A and B.

PART 2 (TIME PERMITTING)

Only do the following if you have the time.

After you have tested your circuit and you are satisfied it works, add LEDs to show that values of the inputs. The LEDs must be setup in parallel with the logic gate so that the voltage drop across the LED doesn’t affect the input’s value.

Ask your teacher if you are uncertain.

When completed, show your work to your teacher. You will get marks for the neatness of your circuit.