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A Bode plot can be obtained by separating the output and the voltage division resistor for voltage setting (feedback resistor), inputting a sine wave signal on the feedback resistor side, using an oscilloscope to monitor the signal from the output, and plotting the amplitude difference and phase difference between the input signal and the output signal at each frequency. However, reading off figures from the monitored waveforms is difficult, and so this is not a very realistic method.