lab report eet 2010

EET 2010 Lab Exercise #4 Electronics Principles

BI-POLAR JUNCTION TRANSISTOR

Equipment 1. DC Power Supply 2. Multimeter

Materials

1. 2N3904 NPN Transistor

2. 22 k Resistor

3. 47 k Resistor

4. 470  Resistor

5. 1.0 k Resistor

Procedure 1. Measure (and record) the resistances of each of your resistors

using the multimeter.

2. Connect the circuit as shown in Figure 4-1. You will need to look

up the datasheet of the 2N3904 to know how to connect each

transistor terminal. Measure the voltage drops across each of

the resistors, each terminal voltage (VC, VE, VB) and VBE, VCE, VCB

3. Measure the base and collector currents. (Remember: Current

is measured through the multimeter, so it is necessary to place

the meter terminals in series in the circuit. If you are unsure of

how to do this ask your lab instructor.)

4. Calculate the emitter current.

5. Calculate the actual DC current gain of this circuit.

Submittal:

Figure 4-1

R1 47kΩ

R2 22kΩ

RC 1kΩ

RE 470Ω

2N3904

VCC 5.0V

1. Title Page (Appropriate information is described in the ‘Format of a Technical Report’ found on Blackboard) 2. OBJECTIVE – This section is in paragraph form comprised of complete sentences stating the purposes for doing the experiment. (What theory was this experiment supposed to verify?) 3. PROCEDURE – This section may be a list of numbered or bulleted items (do not copy this handout)

EET 2010 Lab Exercise #4 Electronics Principles

a. Circuit

b. Calculations – This will include a theoretical analysis (use a thevenized analysis)

of each of the currents and voltages measured in lab. Use  = 150, VBE = 0.7V.

These must be typed.

c. Table 4-1 includes nominal and measured resistance quantities.

d. Table 4-2 includes theoretical (calculated) and measured voltage quantities.

e. Table 4-3 includes theoretical (calculated) and measured current quantities.

f. Table 4-4 includes the percent of error for theoretical vs. measured quantities

g. Graph 4-1 of the DC Load Line including a measured and a calculated Q-Point.

h. 2N3904 Datasheet – it is only necessary to include the pages referenced/used in

this submittal.

1) How does the  value given (in 5.b above) compare to the calculated value of

 (ICmeasured/IBmeasured) and the datasheet value (It will be necessary to

determine the value of  by using the appropriate graph on the datasheet

(hfe vs. IC (at T= 25o C) use the theoretical value of IC)?

2) If an ac signal were to be amplified by this circuit, what is the maximum

possible symmetrical swing of IC (peak-to-peak)?

Hint: For a successful submittal, make sure your submittal components are presented in the

above order. This makes organized and logical sense for an explanation of data. Be sure

headings are stated (for example: DATA) and all components of the DATA section (for example:

TABLE 4-1) are labeled.

BONUS:

1. Simulate the circuit in Multisim verifying measured values (Make at least one statement

comparing simulated values to measured values.) (5 percentage points)

2. Calculate the theoretical, no-load gain of the circuit. (5 percentage points)

4. DATA sec$on including:

5. DISCUSSION – This section is in paragraph form comprised of complete sentences comparing the theoretical and measured results of the experiments. This sec2on should also answer the following questions: