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(Solved) I need help answering all of the following questions and diagrams


I need help answering all of the following questions and diagrams for ET1310 Lab 2.1 Report (Parts 1, 2, and 3). Please and Thank you in advanced. Whom ever does this for me, you're a life savor!

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ET1310: Module 2 DC Power Supplies and BJTs

 

Lab/BJT Characteristics and Biasing

 

Lab 2.1 Report

 

Name:

 


 

Date:

 


 

Instructions:

 

Complete the three parts?Part 1, Part 2, and Part 3 of Lab 1. When you have completed each part,

 

answer the questions and transcribe/transfer the test results recorded in the lab manual?s tables to the

 

tables provided.

 

Part 1?BJT Characteristics

 


 

Theory:

 

1. Name the three terminals of a BJT transistor.

 

2. Why are BJT transistors considered current amplifiers?

 

3. What is the relationship between IC and IE?

 

4. Describe how to bias a BJT transistor correctly.

 

5. What is the forward-biased voltage drop across the base-emitter junction?

 

Preparation:

 

6. Transcribe the component measurements from Table 6-1 to the table below.

 

Component

 

R1

 

R2

 

RBB

 

RCC

 


 

Listed Value

 

22 k Ohm

 

100 Ohm

 

1 k Ohm

 

5 k Ohm

 

Table 6-1

 


 

Measured Value

 


 

7. For a 2N3904 NPN General Purpose BJT transistor, how can you determine the location of pin 1?

 

the emitter?

 


 

Test Procedure:

 

8. Transcribe the collector current measurements and calculations from Table 6-2 to the table below.

 

VCE

 


 

1

 


 

Base Current = 50 µA

 


 

Base Current = 100 µA

 


 

Base Current = 150 µA

 


 

ET1310: Module 2 DC Power Supplies and BJTs

 

Lab/BJT Characteristics and Biasing

 

Measured

 


 

VR2

 


 

IC

 


 

VR2

 


 

IC

 


 

VR2

 


 

Measured

 


 

Computed

 


 

Measured

 


 

Computed

 


 

Measured

 


 

2.0 V

 

4.0 V

 

6.0 V

 

8.0 V

 

Table 6-2

 

9. Transcribe the three collector characteristic curves from Plot 6-1 to the plot below.

 


 

Plot 6-1

 


 

10. Transcribe the DC Beta calculations from Table 6-3 to the table below.

 

VCE

 

Measured

 


 

Current Gain ?DC

 

IB = 50 µA

 

IB = 100

 

IB = 150

 

µA

 


 

3.0 V

 

5.0 V

 

Table 6-3

 


 

2

 


 

µA

 


 

Lab 2.1 Report

 

IC

 

Computed

 


 

ET1310: Module 2 DC Power Supplies and BJTs

 

Lab/BJT Characteristics and Biasing

 

Lab 2.1 Report

 

11. Does the experimental data indicate that ?DC is a constant at all points? Does this have any effect on

 

the linearity of the transistor?

 

12. What effect would a higher ?DC have on the characteristic curves you measured?

 

13. What is the maximum power dissipated in the transistor for the data taken in the experiment?

 

14. The DC alpha (?) of a bipolar transistor is the collector current, IC, divided by the emitter current, IE.

 

Using this definition and IE = IC + IB, prove that DC alpha can be written as:

 


 

? DC =

 


 

? DC

 

? DC +1

 


 

15. Compute DC alpha for your transistor at VCE = 4.0 V and IB = 100 ?A.

 

16. What value of VCE would you expect if the base terminal of a transistor were open? Explain your

 

answer.

 


 

3

 


 

ET1310: Module 2 DC Power Supplies and BJTs

 

Lab/BJT Characteristics and Biasing

 

Lab 2.1 Report

 

Part 2?BJT Biasing

 


 

Theory:

 

17. How do we describe the nonchanging, no signal output of a biased transistor circuit?

 

18. Why is the base biasing method unacceptable for linear circuits?

 

19. For which application is base biasing most suitable?

 

20. What is the advantage and disadvantage of the emitter bias circuit?

 

21. What is the advantage of voltage-divider bias? What is stiff bias?

 

22. What effect does negative feedback have in a collector-feedback bias circuit?

 

Preparation:

 

23. Transcribe the resister measurements from Table 7-1 to the table below.

 

Resisto

 


 

Listed Value

 


 

Measured Value

 


 

r

 

RB

 

RC

 


 

1 M Ohm

 

2 k Ohm (Two 1 k

 

resistors)

 

Table 7-1

 


 

Test Procedure:

 

24. Transcribe the base biasing circuit calculations and measurements from Table 7-2 to the table below.

 

DC

 

Parameter

 

VRB

 

IB

 

IC

 

VRC

 

VC

 


 

Computed

 

Value

 


 

Q1

 


 

Measured Value

 

Q2

 

Q3

 


 

Table 2-5

 

25. Describe the variation between the three VRC measurements. What does this variation represent?

 

26. Transcribe the resister measurements from Table 7-3 to the table below.

 

Resisto

 

r

 


 

4

 


 

Listed Value

 


 

Measured Value

 


 

ET1310: Module 2 DC Power Supplies and BJTs

 

Lab/BJT Characteristics and Biasing

 

Lab 2.1 Report

 

R1

 

R2

 

RE

 

RC

 


 

33 k Ohm

 

6.8 k Ohm

 

470 Ohm

 

2 k Ohm (Two 1 k

 

resistors)

 

Table 7-3

 


 

27. Transcribe the voltage divider biasing circuit calculations and measurements from Table 7-4 to the

 

table below.

 

DC

 

Parameter

 

VB

 

VE

 

IE?IC

 

VRC

 

VC

 


 

Computed

 

Value

 


 

Q1

 


 

Measured Value

 

Q2

 

Q3

 


 

Table 7-4

 

28. Describe the variation between the three VRC measurements. Is this variation greater than, the

 

same, or less than the variation in the base bias circuit? Explain why.

 

29. Transcribe the resister measurements from Table 7-5 to the table below.

 

Resisto

 


 

Listed Value

 


 

Measured Value

 


 

r

 

RB

 

RC

 


 

360 k Ohm

 

2 k Ohm (Two 1 k

 

resistors)

 

Table 7-5

 


 

30. Transcribe the collector feedback biasing circuit calculations and measurements from Table 7-6 to the

 

table below.

 

DC

 

Parameter

 

IC?IE

 

VRC

 

VC

 


 

Computed

 

Value

 


 

Q1

 


 

Measured Value

 

Q2

 

Q3

 


 

Table 7-6

 

31. Describe the variation between the three VRC measurements. Is this variation greater than, the

 

same, or less than the variation in the base bias circuit? Explain why.

 

32. Compare your observations of the three bias methods tested in the experiment. Which one showed

 

the least variation between the transistors?

 


 

5

 


 

ET1310: Module 2 DC Power Supplies and BJTs

 

Lab/BJT Characteristics and Biasing

 

Lab 2.1 Report

 

33. Draw each of the three bias circuits tested in the experiment for a PNP transistor. Assuming the same

 

resistors as used in the experiment, compute the base, emitter, and collector voltages. Show these

 

voltages on your drawing.

 

Base Bias

 


 

Voltage-Divider Bias

 


 

Collector-Feedback Bias

 


 

6

 


 

ET1310: Module 2 DC Power Supplies and BJTs

 

Lab/BJT Characteristics and Biasing

 

Lab 2.1 Report

 


 

34. Assume you need to bias the amplifier shown below. It is desired to have the Q-point set to

 

approximately 20 mA of the collector current. Choose bias resistors for the voltage-divider bias that

 

will provide a reasonably stiff bias. Show your work.

 


 

35. Assume you need to bias the amplifier shown below. It is desired to have the Q-point set to

 

approximately 5.0 mA of the collector current. Choose a base resistor for the collector feedback bias

 

that will provide a reasonably stiff bias. Show your work.

 


 

36. For the circuit shown below and using the values calculated in problem #34, predict the effect of each

 

of the following problems on the collector voltage:

 


 

7

 


 

ET1310: Module 2 DC Power Supplies and BJTs

 

Lab/BJT Characteristics and Biasing

 

Lab 2.1 Report

 

a. R1 opens.

 

b. Base is shorted to ground through a solder bridge.

 

c.

 


 

RE is 470 Ohm instead of 47 Ohm.

 


 

d. VCC drops to +15 V.

 


 

8

 


 

ET1310: Module 2 DC Power Supplies and BJTs

 

Lab/BJT Characteristics and Biasing

 

Lab 2.1 Report

 

Part 3?The Basic Power Supply

 


 

Test Procedure:

 

37. Transcribe the power supply fault observations from Table L2-1 to the table below.

 

Circuit

 


 

Component

 

Fault

 


 

Power Supply Fault 1a

 

Power Supply Fault 1b

 

Power Supply Fault 1c

 

Power Supply Fault 2a

 

Power Supply Fault 2b

 

Power Supply Fault 2c

 

Table L2-1

 


 

9

 


 

Symptoms of the Fault

 


 

 


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