project-4

project-4 - Worcester Polytechnic Institute Department of...

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1 Worcester Polytechnic Institute Department of Electrical and Computer Engineering ECE 2011 —Introduction to Electrical and Computer Engineering Lab Project 4: Capacitor - Impedance - Audio "Crossover" Network Introduction Read this entire document. Follow every instruction during your laboratory session. Doing so is the most effective way to ensure that you will complete the project in the allotted time. Remember : You must document the entire experiment in your laboratory notes. The notes should include: The date and time . Your partner’s name . The identity number of the laboratory bench at which you are working. The schematic diagrams of any circuits that you build. This is very important because, without them, your notes will make no sense to you at a later time. The results of any measurements made in the laboratory. These should be neatly tabulated or graphed—if appropriate— and labeled. Observations that are requested in the laboratory instruction. Your own thoughts about the experiment. Do the results make sense? Are they surprising in any way? Would you do anything differently if you had the opportunity to repeat the laboratory project? Keep these remarks brief and to the point.
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2 The signature of the laboratory TA or Tutor verifying the proper operation of the project. These notes will be handed in to the laboratory TA at the end of the session.
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3 1. Capacitor What better way to visualize the operation of a capacitor than to build a simple parallel plate capacitor yourself in the lab, and measure its properties? The physical construction of the capacitor you will build in lab is shown in Figure 1. The "plates" are made from aluminum foil (get some from the lab TA) and should be about 6" x 9" in size. The "dielectric" insulating layer between the plates is an 8-1/2" x 11" sheet of paper. Use alligator clips to contact the "plates" for connecting the capacitor to your test circuit. Figure 1. The test circuit schematic is shown in Figure 2. Figure 2.
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4 The "C" in figure 2 is the parallel plate capacitor you constructed according to the physical configuration in Figure 1. Voltage source V S represents the signal provided by the function generator. Resistor R is used to provide a voltage that is proportional to the current through the capacitor (see analysis in section 1.1 below). You need to be a little careful in setting this up; see the suggested
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project-4 - Worcester Polytechnic Institute Department of...

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