Lab 4

.pdf

School

Texas A&M University *

*We aren’t endorsed by this school

Course

214

Subject

Electrical Engineering

Date

Jan 9, 2024

Type

pdf

Pages

9

Uploaded by MateKnowledgeMonkey156

ECEN 214 - Lab Report Lab Number: 4 Lab Title: Operational Amplifier Application: Electronic Security System (1/2) Purpose/Objectives: In this lab, we created a system that uses an infrared emitter, a photo detector, operation amplifiers, resistors, a comparator, a latch, and light emitting diodes. By creating this system, we are able to familiarize ourselves with each component and determine which components would lead to the desired results. The main goal of this lab is to learn how to use op-amps to do various activities, by making a system that is able to detect an interruption in a light beam and trigger an indication. Build a circuit that detects an interruption in a light beam and triggers an indicator.
Learn the applications of op-amps. Procedure: The purpose of this lab was to understand all the components of the circuit before putting them all together to create an electric security system. This lab is broken down into three parts based on the three components: the IR emitter and detector, the signal voltage amplifier, and the comparator. For the first component, we are going to be testing the emitter and detector. Starting with the emitter, create the circuit in Figure 4.9 and change the value of the resistor while measuring the voltage across the resistor to be able to infer the current that is flowing through the emitter. Next, is working with the detector and essentially repeating the same process as the emitter. Figure 4.9: Emitter and Detector Circuit Built in Lab Figure 4.5: Bench equipment for op-amps positive and negative supply The second component is a signal voltage amplifier that will help amplify the signal to create a noticeable difference between low and high voltages. Create an inverting amplifier as seen in Figure 4.12 with chosen values for the resistors that will provide a high amplification to the circuit with saturating it. Measure the output voltage for different input voltages and display where the saturation occurs. Repeat this process with the non inverting amplifier and explain which one would work best with the detector from the previous task.
Figure 4.12a: Inverting Op-amp Figure 4.12b: Non-Inverting Op-amp The last component is a comparator that takes two output voltages and converts to a digital logic level. Start by creating the circuit in Figure 4.13. The next part is to calculate the value of the two resistors that create a voltage divider that is going into the inverting input of the op amp. Similar to the last task, measure the output voltage for different inputs.
Figure 4.13: Voltage Comparator in lab. Discussion, Data Tables, and Data Plots: Task 1: IR Emitter and Detector Resistor (Ohms) IR Emitter (V) Resistor Voltage (V) Current (Amps) 100 1.37 3.42 .0342 500 1.23 3.76 .00752 1000 1.20 3.80 .0038 2000 1.17 3.82 .00191 3000 1.16 3.83 .001277 Table 1: IR Emitter Data (as the resistor value increases, the current decreases in the circuit)
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
  • Access to all documents
  • Unlimited textbook solutions
  • 24/7 expert homework help