CSC270 Lab 3 2016

--D. Thiebaut (talk) 14:43, 9 February 2016 (EST)

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Electronics, Diodes, and Transistors

Part 1: Ohm's Law

• For this part, you will implement the circuit below on the breadboard and you will measure V1 and V2 (see more information about the voltmeter below). Verify that V1 + V2 = 5 V and that V1/R1 = V2/R2.

• You may not be able to find a 4 KOhm resistor, but most likely a 3.9 KOhm one. (See chart below, taken from ecee.colorado.edu/~mcclurel.

Measuring Voltages with the Agilent 34401A Voltmeter

• Press the DC V button, and plug a black probe (rubber banana plug) into the LO connector (refer to diagram above), and a red probe (rubber banana plug) into the HI connector.
• Press the Auto/Man button to put the meter into Automatic range measurements.
• In your lab report, indicate the 3 voltages measured: V, V1, and V2.

Creating Your Own Input Switch

• Implement the circuit below, and connect its output to a Logic Indicator. Use a switch from one of the drawers on the North wall of the room. There are 2 drawers, one labeled "Switches" and one labeled "Push Buttons". Switches are better, although a push button would do as well.
• Verify that you can generate a 0 and a 1 with your switch.

Light-Emitting Diodes (LED)

• Implement the circuit below, which uses an LED. The diagram on the right indicates how to find the polarity of the LED.
• Connect the input of the circuit (left line) to a Logic Switch. Connect one of the Logic Indicators on the Kit to the same Logic Switch.
• Comment on your circuit. Is it working the way you want? Why or why not?

• Fix the circuit by adding the appropriate gate.

Transistor as Inverter

• Implement the circuit below, using a 2N2222 transistor. The pin labeling of the 2N2222 is given in the diagram, to the right.
• Connect the inputs of the AND gate to a Logic Switch. Connect the output of the transistor (Collector) to a Logic Indicator.
• Connect the output of the AND gate to a Logic Indicator.
• Verify that the transistor inverses the signal it receives.

Mystery Gate

• Implement the TTL (transistor-transistor logic) gate below:
• Generate its truth table
• Identify the gate.