Introduction to Electronics - PHYS2211

Assignment #2

Due date: November 4th, 2015

1. Draw the output voltage waveform for each circuit Figure 1 and include the voltage values.

Figure 1

2. A power-supply transformer has a turns ratio of 5:1. What is the secondary voltage if the primary is connected to a 120 V rms source?

3. Find the average value of each voltage in Figure 2.

Figure 2

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4. Draw the output voltage waveform for the bridge rectifier in Figure 3. Notice that all the diodes are reversed from circuits shown earlier in the chapter.

Figure 3

5. A certain full-wave rectifier has a peak output voltage of 30V. A 50μF capacitor-input filter is connected to the rectifier. Calculate the peak-to-peak ripple and the dc output voltage developed across a 600? resistance.

6. What value of filter capacitor is required to produce a 1% ripple factor for a full-wave rectifier having a load resistance of 1.5k?? Assume the rectifier produces a peak output of 18V.

7. Determine the output voltage waveform for each circuit in Figure 4.

Figure 4

8. Determine the RL voltage waveform for each circuit in Figure 5.

Figure 5

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9. Determine the output voltage waveform for each circuit in Figure 6.

Figure 6

10. Describe the output waveform of each circuit in Figure 7. Assume the RC time constant is much greater than the period of the input.

Figure 7

11. Repeat problem 10 with the diodes turned around. The American University in Cairo - School of Sciences and Engineering - Department of Physics

12. To what value must R be adjusted in Figure 8 to make IZ = 40 mA? Assume VZ = 12 V at 30 mA and ZZ = 30 ?.

Figure 8

13. A loaded zener regulator is shown in Figure 9. VZ = 5.1 V at IZ = 49 mA, IZK = 1 mA, ZZ = 7 ? and IZM = 70 mA. Determine the minimum and maximum permissible load currents.

Figure 9

14. Analyze the circuit in Figure 9 for percent line regulation using an input voltage from 6 V to 12 V with no load. Refer to Chapter 2, Equation 2-14 in your textbook.