W5-Lab 5 Wien Bridge-OL

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WEEK 5 LAB ASSIGNMENT WIEN BRIDGE-OL 06/11/2023 DEANDRE WHEELINGTON PROFFESOR: J KOSCINSKI

Experiment 5: Wien-Bridge Oscillator Objectives: After performing this experiment, you should be able to: 1. Construct and test the Wein-Bridge Oscillator for various values of R and C combinations. 2. Calculate and measure the frequency of oscillations. Components: 1. Op-Amp (1) 741C 2. Capacitors (2) 1µF, (2) 1nF, (2) 10nF, (2) 100nF 3. Resistors (2) 1.5kΩ, (3) 10kΩ, (1) 22kΩ Procedure: 1. For the circuit shown in the Figure 1 below, calculate the frequency of oscillations using the formula below for the R, C values shown in table 1 below. Record the results in table 1 under calculated frequency. f r R C Vin @ pin 3 Vout @ pin 6 Gain Av Calculated Freq. (f r ) Measured Freq. (f r ) 10 kΩ 1 nF 3.01 V 14.01 V 4.65 15 kHz 12.4 kHz 1.5 kΩ 10 nF 4.07 V 13.9V 3.41 10.61 kHz 8.4 kHz 1.5 kΩ 100 nF 5.14 V 13.8 V 2.68 1.06 kHz 1.02 kHz Table 1: Calculated and measured values 2. Construct the circuit shown in Figure 1 in multisim. (Note: First build the op-amp amplifier circuit, then the output of the amplifier is feeding input to the lead-lag circuit. Output of the lead-lag circuit is feeding to the input of the amplifier at pin 3.) = 1 2𝜋𝑅𝐶

3. Connect the output (pin 6) of the circuit to the oscilloscope. 4. Tune the 100kΩ potentiometer so that you should see a clear sine wave without any clipping. (Note: Depending upon where you are at on the pot, you may need to turn the wiper a lot to see the signal. Change the potentiometer settings so you can adjust by 1%) 5. Measure the output voltage of the amplifier at pin 6 using oscilloscope and record the results in Table 1 above under V out . 6. Measure the frequency of the output sinewave and record the result in Table 1 above under measured frequency. Figure 1: Wein-Bridge Oscillator Lead-Lag Circuit

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7. Measure the input voltage of the amplifier at pin 3 using oscilloscope and record the results in Table 1 above under V in . 8. Calculate the gain of the amplifier using the measured voltage and record the results in Table 1 above under the measured gain (Av). A V 10. Replace the lead-lag circuit R and C values as listed in table 1 above, and repeat the steps 5 through 9. Circuit with first values of R & C: Circuit:

Input Voltage: Output Voltage: Frequency when adjusting POT:

CIRCUIT WITH 2 ND VALUES OF R & C: CIRCUIT:

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INPUT VOLTAGE:

OUTPUT VOLTAGE: FREQUENCY WHEN ADJUSTING POT: Circuit with 3 rd Values of R & C:

INPUT VOLTAGE

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OUTPUT VOLTAGE: FREQUENCY SHOWN IN PICTURE ABOVE ^ OVERALL SCREENSHOT OF EVERYTHING FOR DATE AND TIME:

SOURCES: Floyd, T. L. (2017). Electronic Devices (Conventional Current Version) (10th ed.). Pearson Education (US). https://ecpi.vitalsource.com/books/9780134414553 *********End of the experiment *********