Q2: Create another plot of your low-pass filtered data (this time without the

normalization), and overlay on top a curve for the analytical transfer function

expected using the gain equation and the experimentally determined RC time

constant. Place a vertical dashed line at the identified -3 dB frequency and a

horizontal dashed line at the -3 dB amplitude level. The -3 dB frequency is the

frequency at which the output power is half the input power (where P=V²/R). Refer

to the appendix for more information regarding the -3 dB frequency. Include with

your assignment:

• Your plot.

•

The -3 dB frequency and the expected cutoff frequency.

•

Comment on how you might translate the tolerances specified in the

previous problem to uncertainty bounds in the expected cutoff frequency.

Technical accuracy will not be graded for this part of the question, we are just

asking you to think about how the problem might be addressed. Comment also

on how this might be presented in a figure, as relates to the expected gain

curves./nPart II: Characterize a non-inverting amplifier

Next, you will build a non-inverting amplifier circuit as is diagrammed in Fig. 3 using a 1

kn resistor for both R, and R₂.

R₁

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Figure 4: Schematic diagram for a non-inverting amplifier circuit, leveraging an opamp

component (image taken from Wheeler and Ganji "Introduction to engineering

experimentation").

Offset Null 1

B

+0

Figure 4 shows the pin definitions for your MCP 6271 opamp. Pin #1 is located at the

upper left corner adjacent to the small "half-moon" cutout. You can view a photo of the

electrical connections in the Lab 4 demonstration video.

leverting (-) 2

Op-amp

Non-Inverting (+) 3

Op. Amp.

Not Connected (NC)

V+ (Power) +5V from

Arduino

Output

GND from (Power) V-

Arduino

Figure 5: Pinout diagram for the opamp. You will not use pins 1, 5, or 8.

Offset Null

Characterize the transfer function of the non-inverting amplifier using the same method

as the previous part. Note that an amplifier also has a cutoff frequency (similar to a

low-pass filter), however it is occurring at a frequency higher than what we are

measuring.