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Apr 30, 2024
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EE 97 Spring 2023
Tuesday 3:00-5:45 PM
Lab #8: Frequency Response
Huy Nguyen
Partner: Edward Nguyen
Submission Date: 04/21/2023
Lab #8: Frequency Response
Learning Objectives
After completing this lab, students should be able to
• Explain the definition of the frequency response of a circuit.
• Experimentally determine a circuit’s frequency response
• Present a circuit’s frequency response data using a Bode plot.
Experiment 1:
In this experiment, we will determine the voltage gain of this amplifier and its maximum output power to the speaker.
1.
First, we connected the output of the function generator to the input of the R-CH amplifier. The red wire is the input to the R-CH amplifier.
2. Then, connect scope probe 1 to the input of the amplifier and probe 2 to the output of the amplifier.
Figure 1 Amplifier setup.
2.
Turn the volume control of the amplifier to the maximum. Set the function generator frequency to 1kHz and the peak-to-peak output amplitude to100mV.
Figure 2 The function generator setup.
4. Determine the voltage gain of the amplifier by dividing the output amplitude by the input amplitude. V
out
÷V
in
.
𝑇ℎ? ??????? ??𝑖? =
?
???
?
𝑖?
=
5.480 ?
0.80 ?
= 6.85
5. We gradually increased the function generator output amplitude until the output waveform is just 'clipped' (as shown in Figure 4) and recorded the peak-to-peak saturation level. ?
?𝑒𝑎𝑘−??−?𝑒𝑎𝑘
= 5.480 ? ?
?𝑒𝑎𝑘
= 2.74? ?
?𝑀?
= 0.707 × 2.74 ? = 1.94 ?
Figure 3 Measuring Vpeak-to-peak value.
6. Finally, we used the formula Power=V
rms
2
/Z to determine the output power to the speaker at this level of output. Z in this equation represents the impedance of the speaker and its value is 4Ω.
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