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| Differentiating Op-Amp Circuit |
Today the lab required us to build a differentiating op-amp circuit. We built this circuit using a 470 nF capacitor and a 470 Ω resistor.
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| Results |
The pre-lab required us to calculate the theoretical Vout from the op-amp when it is supplied a sinusoidal function of different frequency. The sinusoidal function supplied from the analog discovery had an amplitude of 1V offset of 0 and varying frequencies of 1kHz, 2kHz, and 500 Hz. Using the analog discovery we also used the oscilloscope to measure the voltage coming out of the op-amp. The output voltages are shown above
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| 1kHz Sinusoidal Function |
Using the oscilloscope we found the output voltage to be 1.22 V
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| 2kHz Sinusoidal Function |
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| 500 Hz Sinusoidal Function |
Summary:
Today we learned more about 1st order linear circuits. We also learned about new op-amp circuits. The op-amp circuits we learned about are integrating and differentiating op-amp circuits. The lab we did required us to build a differentiating op-amp circuit. We found that for the 1st trial the voltage output had a percent error of 13.7%, the 2nd trial had a percent error of 11.9% and the last trial had an error of 7.4%. I believe the error is due to the capacitance of the capacitor not being 470nF and calculating the output voltage with that value. It may also be due to the instruments being used not being perfect.
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