InClass 05_Passive_Filters

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Ohio State University *

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2000

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Electrical Engineering

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Feb 20, 2024

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BIOMEDE 3702 In Class: Passive Filters For this pre-lab you will need to log into https://www.tinkercad.com/ to build the circuits in the following diagrams. Sign up using your email. Once in tinkercad, select Circuits and then Create new Circuit . To find the necessary components for this prelab make sure the Components drop down on the right is in All , rather than Basic. Materials:  Under the General section: o Resistor o Capacitor  Under the Breadboard section : o Small Breadboard  Under the Instruments section: o Function Generator o Oscilloscope First Circuit – Low Pass Filter : Instruction: 1. Looking at the diagrambuild the following circuit using tinkercad. Note that the left oscilloscope is connected directly into the function generator. 2. Set the resistor to 3.3 kΩ and the capacitor to 1 µF. 3. Set the function generator to have peak-to-peak of 1 V and DC Offset 0 V, use a sine wave. Use the frequencies below. 4. Peak-to-Peak is equal to twice the amplitude. We are measuring on the Y-axis. 5. Click Start Simulation on tinkercad and change the frequency on the function generator. To measure peak-to-peak, each square in the oscilloscope is 1/10 of the value shown on the right (Example: 5 blocks (out of 10) and a total of 2 volts. Vout = [5/10] * 2V = 1 V) 6. Click on the oscilloscope and change the time window as you increase the frequency. Figure 1: Circuit Diagram and Breadboard Connect1ion

BIOMEDE 3702 Freq. (Hz) Volts (V) Freq. (Hz) Volts (V) Freq. (Hz) Volts (V) Freq. (Hz) Volts (V) 1 10 1.0 V 100 1000 5 50 500 5000 7 70 700 7000 Second Circuit – Bandpass Filter : Instruction: 1. Looking at the diagram and using the image build the following circuit using tinkercad. 2. Set both resistors to 10 kΩ and each capacitor to 318.5 nF and 31.8 nF ( Figure 2 ). 3. Measure the voltage across the last capacitor. 4. Click Start Simulation on tinkercad and change the frequency to fill the table. Figure 2: Circuit Diagram and Breadboard Connect1ion Freq. (Hz) Volts (V) Freq. (Hz) Volts (V) Freq. (Hz) Volts (V) Freq. (Hz) Volts (V) 1 10 100 1000 2 20 200 2000 5 50 500 5000 Creating a Bode Magnitude Plot: A bode magnitude plot is a type of graph that shows the gain of a system at different frequencies. It is used for filters to show which frequencies the filter attenuates and which are passed . A bode plot shows on the x-axis frequencies, and y-axis gain (in dB). The x-axis needs to be logarithmic , while the y-axis (converted in dB) is itself already logarithmic. To convert gain (Vout/Vin) to dB use the following equation: gain ( dB ) = 20log 10 ( V out V ¿ ) Discussion Questions: 1. Include a screenshot of your two circuits. 2. Create a bode plot for the first circuit. 3. Create a bode plot for the second circuit.

BIOMEDE 3702 4. Calculate the specific cutoff frequency of the first circuit (discussed in class). 5. Calculate the specific cutoff frequencies of the second circuit (discussed in class). Note: You will have two, one for R1 and C1, and another for R2 and C2. Record Misconceptions : Please list below any misconceptions, doubts, or discussion points that need clarification.

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