Project 3 Report Electronics 1

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University of Central Florida *

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3307

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Electrical Engineering

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Apr 3, 2024

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Project 3 Report Davi Dantas Electronics 1
1. Laboratory partner. My lab partner is Phillip Murano 2. Date and time data were taken. Date and time this lab was started 2 / 13 / 2024 at 12:30 pm. 3. The pre-laboratory results.
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For this lab, we needed to put into practice our knowledge of transistors and they behave in a circuit. For the pre lab, we found out the different currents and voltages asked by the assignment and how the different circuits affected the result from the currents and voltages as you can see in the pictures above. The results were as expected from the math calculations done before the lab.
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4. The experimental procedures. 1. We set up the circuit shown in Figure 1.b on our breadboard using the values we calculated beforehand. We then measure the Q point, as well as the currents Ic and Ib. By comparing the computed current gain to the given value, we gain confidence in the accuracy of our measurements. The experimental value for Ib was 2.9m A and the Beta was close to 220. 2. Next, we adjust the Vbb (base voltage) until the curent in Ic reaches 2mA. The adjusted Vbb value is 0.7V. We replace the transistor with another one and check if the current values remain consistent. However, due to impurities in the transistor, the measured currents are not exactly the same but they were very close. 3. In part c of the experiment, we swap out the Re resistor with a 1.8K resistor and repeat the same procedures and we get 4. Moving on to part d, we construct the circuit shown in Figure 3 using the calculated values. We measure the Q point and compare it with the expected values. Our measured voltage and calculated voltage differed by about 1.1V and the current for about 0.9 mA. 5. All calculations and simulation results for each step. The calculations performed can be found during the pre lab pictures. The formulas used were Ic = Beta (Ib), use of mesh equations and ohm’s law. 6. All plots and waveforms for each step. All plots and waveforms are referenced in the pictures above. 7. Short summary discussing what was observed for each of the steps given in experiment. For this experiment we observed the calculated values and measured values and noticed that don’t perfectly match. Some currents and voltages were closer to the calculated values than
the others. We make an assumption that the collector current is very close to the emittpr current. In all of the experiment we also have some expectation of human error and physical discrepancies that cannot be foreseen. Overall, most of the results were fairly close to the calculations. 8. What you learned/Conclusion During the experiment, I gained a better understanding of transistors in general. How the transistor work and how they behave in a circuit. In the experiment I became more familiar with the calculations and how to analyze the Q point and Beta. I also improved my understanding of what happens to circuit when Beta is changed or when we change a resistor.