W3 -Lab 3 Linear Op-Amp Assignment FIXED AND UPDATED

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Experiment 3: Linear Op-Amp circuits Objectives: After completing this experiment, you should be able to, 1. Observe the behavior of Non-inverting, inverting and voltage follower circuits using Op-amps. 2. Calculate the output voltage and gain of these amplifiers. 3. Measure the output voltage and observe the phase relation between input and output signals. Components needed: Instruments used: 1. Resistors: 10kΩ, 1kΩ, 5.6kΩ, 1.5kΩ 2. Op-Amp: (1) LM741C 1. Digital Multimeter (DMM) 3. Capacitor: (2) 1 µ F 2. Oscilloscope Procedure: 1. The LM741C is 8-pin op-amp. The pinout is shown below. Observe there is a notch and a dot on the IC. The left side pin to the notch/dot is pin 1. Figure 1: LM741 Pinout and Breadboard placing Non-Inverting Amplifier: 2. For the circuit shown in the Figure 2 below, calculate the voltage gain of the non- inverting amplifier for all the combinations of resistor values shown in table 2. Record the results in Table 2 below under calculated voltage gain (Av).

Voltage gain (A V ) Answer: 1 + Rf Rin = 1 + ( 10 kΩ 1 kΩ ) = 11 kΩ 3. Calculate the output voltage of the amplifier and record the results in Table 2 under the calculated V OUT . V out = A V * V in Answer: V out = A V ∗ V ¿ = 11 ∗ 1 V PP = 11 V PP 4. Construct the circuit shown in Figure 2 in multisim. Carefully observe the capacitor polarities. Pin 1 and 5 are not used. Pin 7 is positive 15V supply and Pin 4 is negative 15V supply. VCC V 15 VS 500mVpk 1kHz 0° Rin kΩ 1 AC_Power C1 µF 1 Rf 10kΩ C2 1µF VEE -15.0V U1 LM741CN 3 2 4 7 6 5 1 (Pin 52)

Figure 2: Non-inverting Amplifier 5. Set the input to an amplitude of 1V PP and frequency to 1 kHz, sinewave signal. 6. Connect channel 0 of the scope to the input signal across the input source and channel 1 at the output of the op-amp (pin 6). ** I used channel 2 for the output of the op amp 7. Select both channels to AC coupling. 8. You should be able to see the following waveforms. (Oscilloscope may look different) Figure 3: Non-inverting Amplifier input/output waveforms

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MY MULTISM SCREENSHOT OF THE LAB Pt 1 9. Observe the phase shift between the input and output signal. The phase difference is about 180 degrees . ( 0 degrees, 180 degrees)

10. Record the peak-to-peak output voltage of the amplifier in table 2 under the measured V out . 10.9 Volts (About 11). 11. Calculate the measured gain of the amplifier using the measured output voltage and record the results in Table 2 under the measured voltage gain (Av). A V 11 Volts 1 Volt = 11 Volts **I used 1 volt from the value in Figure 3, mine was slightly off in MultiSim? 12. Replace the feedback resistor to a new values listed under Table 2 and repeat the steps 10 and 11. R in R f Calculated gain (A V ) Calculated V OUT Measured V OUT Measured Gain (A V ) 1 kΩ 10 kΩ 11 Volts 11 Volts 11 Volts 11 Volts 1 kΩ 5.6kΩ 6.6 6.6 Volts 6.6 Volts 6.6 1 kΩ 1.5kΩ 2.5 2.5 Volts 2.5 Volts 2.5 Table 2: Calculated and measured values Answers: Av = 1 + ( 5.6 kΩ 1 kΩ ) = 6.6 Volts Vout = 6.6 ∗ 1 Vpp = 6.6 Vpp Av = 1 + ( 1,5 kΩ 1 kΩ ) = 2.5 Volts Vout = 2.5 x 1 Vpp = 2.5 Vpp Measured Av = 6.6 V 1 V = 6.6 Measured Av = 2.5 V 1 = 2.5 V Inverting Amplifier:

13. For the circuit shown in the Figure 4 below, calculate the voltage gain of inverting amplifier for all the combinations of resistor values shown in table 3. Record the results in Table 3 below under calculated voltage gain (Av). A V Answer: Av = − Rf Rin =− ( 10 kΩ 1 kΩ ) =− 10 V 14. Calculate the output voltage of the amplifier and record the results in Table 3 under the calculated V OUT . V out = A V * V in Answer: Vout = Av ∗ Vin =− 10 ∗ 1 Vpp =− 10 Vpp 15. Construct the circuit shown in Figure 4 below in multisim. (Note: You don’t need to change the power supply connections from the previous circuit) Figure 4: Inverting Amplifier VCC V 15 VS mVpk 500 kHz 1 ° 0 Rin kΩ 1 AC_Power C1 1µF Rf 10kΩ C2 1µF VEE -15.0V U1 LM741CN 3 2 4 7 6 5 1

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16. Connect channel 0 of the scope to the input signal across the input source and channel 1 at the output of the op-amp pin 6. **I used Channel 2 for the output of the op-amp 17. You should be able to see the following waveforms. Figure 5: Inverting Amplifier input/output waveforms MY MULTSIM SCREENSHOT OF THE LAB Pt 2

18. Observe the phase shift between the input and output signal. The phase difference is about 180 degrees . ( 0 degrees, 180 degrees) 19. Record the peak-to-peak output voltage of the amplifier in table 3 under the measured V out . 20. Calculate the measured gain of the amplifier using the measured output voltage and record the results in Table 3 under the measured voltage gain (Av). A V Answer: Av = Vout Vin = 10 V 1 V = 10 Volts 21. Replace the feedback resistor to a new value listed under table 3 and repeat the steps 19 and 20. R in R f Calculated gain (A V ) Calculated V OUT Measured V OUT Measured Gain (A V ) 1 kΩ 10 kΩ -10 Volts -10 Volts 10 Volts 10 Volts 1 kΩ 5.6kΩ -5.6 -5.6 Volts 5.6 Volts 5.6 1 kΩ 1.5kΩ -1.5 -1.5 Volts 1.5 Volts 1.5 Table 3: Calculated and measured values Av =− ( 5.6 kΩ 1 kΩ ) =− 5.6 Volts Vout =− 5.6 ∗ 1 Vpp =− 5.6 Vpp

Av =− ( 1,5 kΩ 1 kΩ ) =− 1.5 Volts Vout = 1.5 x 1 Vpp =− 1.5 Vpp Measured Av = 5.6 V 1 V = 5.6 Measured Av = 1.5 V 1 = 1.5 V Voltage Follower: 22. The circuit shown in Figure 6 below is a voltage follower. The voltage gain (A V ) of the voltage follower is A V = Vout Vin = 1 Volt 1 Volt = 1 Figure 6: Voltage Follower 23. Construct the circuit shown in Figure 6 in multisim. 24. Connect channel 0 of the scope to the input signal across the input source and channel 1 at the output of the op-amp pin 6. **I used channel 2 for the output of the op-amp VCC 15V VS mVpk 500 1kHz ° 0 AC_Power C1 1µF C2 µF 1 VEE V -15.0 U1 LM741CN 3 2 4 7 6 5 1

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25. You should be able to see the following waveforms. Figure 7: Voltage follower input/output waveforms MY Multisim Lab Screenshot Pt 3

26. Measure the output voltage. The output voltage is 1 Volt. 27. Is the output signal following the input signal? They are perfectly lined up with each other on the oscilloscope 28. The phase shift between the input and the output signal is 0 References: Floyd, T. L. (2017). Electronic Devices (Conventional Current Version) (10th ed.). Pearson Education (US). https://ecpi.vitalsource.com/books/9780134414553 *********End of the experiment *********

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