07-FL23 WL Voltage Follower

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Purdue University *

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177

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Electrical Engineering

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Dec 6, 2023

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pdf

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Print name (first last): ______________________ Lab partner (first last): ______________________ Course: ECET 17700 Lab date (mm/dd/yy): ______________________ Instructor: ______________________ 07. The Voltage Follower Op Amp Amplifier Performance Checks 0. Prelab 1. Loaded Potentiometer 2. Voltage Follower 0. Prelab 1. Build the following circuit on your bread board. Follow the schematic precisely, there are no power supply connections made. Figure 1 Potentiometer and Voltage Follower 2. Figure 2 shows the circuit in figure 1 built by a lazy student. Identify three (3) specific things that you would do to improve the circuit breadboard and implement them in your circuit.
ECET 17700 - 2 - 7. The Voltage Follower Figure 2. Photograph of a Student’s Circuit that Needs to be Improved 3. Demonstrate this to the lab instructor immediately when you arrive for lab. Must be completed before you enter your lab else no credit. Building the circuit in lab does not count for prelab points. For full credit, you must have implemented three specific improvements to Figure 2.
ECET 17700 - 3 - 7. The Voltage Follower 1. Objectives The objective of this lab is to demonstrate the loading effect and understand why it is problematic. You will then remove loading with a voltage follower op-amp. 2. Approach and Results 1. Loading In this section of the lab experiment you will demonstrate circuit loading of a voltage divider circuit using the circuit built in the prelab. a. Connect the voltage divider’s input to the function generator and the oscilloscope. b. Connect the voltage divider’s output to the oscilloscope. 1. Connect oscilloscope CH2 to the wiper arm of the 10k potentiometer using a 10x oscilloscope probe. 2. Insure that all commons (grounds) are connected together using a bus (common connection point on the breadboard). 3. Tape everything down c. Your circuit should be as shown in Figure 3. If you don’t have BNC to BNC, connect CH1 and Function Generator at the breadboard. Figure 3 Instrumentation Configuration for Function Generator and Oscilloscope Probes d. Remove the op amp (operational amplifier) TLC 081 from the circuit carefully so as not to bend its pins. Put it someplace safe. e. Set the function generator to provide a 1 kHz, 100 mV rms sine wave. Then, enable the output. f. Adjust the oscilloscope to: 1. Put the voltage divider input (CH1) in the lower half of the screen. Adjust the volts/div to fill that half screen. 2. Put the voltage divider output (CH2) in the upper half of the screen. Adjust the volts/div to fill that half screen. 3. Use the oscilloscope’s Measure function to display the rms of each channel beside that trace. 4. Add a measure of the input signal’s frequency. 5. Adjust the time/div to display about two cycles.
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