Catalog Data:EET 111, Electronics I Laboratory, 3 cr.,
Investigation of electronic devices and their operation in active
circuits.  Introduction to electronic circuit design.
Co- requisite: Electronics 
.
Goals:	Have students gain a practical understanding of semiconductor 
device operation through performance of selected experiment, chosen in 
support of the lecture material.  Have the students develop the ability to 
concisely report the results of experiments in a written manner.

Prerequisites by topic:

1. Information about device operation supplied by the lecture course.
2. Experience with use of the test equipment such as power supplies,
 meters and oscilloscope.

Topics:

1. Diode characteristics and measurements. ( 3.0 lab hours)
2. Voltage clipper and clamper circuits. ( 3.0 lab hours)
3. Halfwave rectifier. ( 3.0 lab hours)
4. Fullwave bridge rectifier. ( 3.0 lab hours)
5. Bipolar transistor characteristics. ( 3.0 lab hours)
6. Base bias and emitter bias circuits. ( 3.0 lab hours)
7. Voltage divider bias. ( 3.0 lab hours)
8. Common emitter amplifier. ( 3.0 lab hours)

Computer usage:
Computers are used extensively in this laboratory to support performance 
of the experiments and reporting the results.  Students use PSPICE and 
Electronic Workbenck software to analyze the experiments performed in 
the laboratory.  The students use computers as word processors to compose 
and print their lab reports.



TEXT: "Experiments in Electronic Devices", Berlin

REF TEXT: "Electronic Devices, 4th Ed. ", Floyd

WEEK			TOPIC		COMMENT					EXP#

2			DIODES		I/V CHARACTERISTICS			1


3			RECTIFIERS		HALF-WAVE			HANDOUT
						FULL-WAVE			


4			RECTIFIERS		FULL-WAVE  W/FILTER		HANDOUT


5			DIODE CIRCUITS		CLIPPERS/CLAMPERS		4,5,6
						VOLTAGE DOUBLERS


6			BJT			I/V CHARACTERISTICS		8
										SUPPL#6

7			BJT BIASING		BASE BIAS			9
						EMITTER BIAS			10


8			BJT BIASING		VOLTAGE DIVIDER			11


9			AMPLIFIERS		COMMON EMITTER			13


10			TBD		





ELECTRONICS I LABORATORY  
Halfwave & Centertapped Transformer Fullwave Rectifier- SUPPLEMENT

Addended Materials:   1 - 10uF, electrolytic capacitor ( not  100uF)
                                    other components as specified


1. First, turn on the oscilloscope.  Next attach a probe to CH1 and 
connect it across the transformer of the CADET.  Press the "AUTOSET"
 button on the scope, and you should observe a sinewave display.   

You can next use the cursors of the scope to measure the amplitude,
 period and frequency of the signal.  Record  the peak value of the 
waveform, its period and frequency.  The instructor will explain 
how to do this.

Next, connect the DVM across the transformer.  Be sure it is set 
to display AC VOLTS.  Record the AC value of the voltage.  
Compute the peak value of the voltage from the AC measurement 
and compare it to the value which you measured. Sketch the 
waveform as Vin on Plot 1.

Switch the DVM to display the DC value of the waveform, and 
record this value.

2.  Connect the  halfwave rectifier circuit to the transformer output.  
Sketch the waveform as Vload on Plot 1.  Be sure to indicate both 
vertical and time scale values on your plots.  You may use the scope 
cursors to determine the amplitude and period values.

Connect the DVM across the output to measure Vload.  Use both the 
AC and DC scales and record the values.  Compare the DC value to 
the average value computed from the halfwave display.

Place a 10uF capacitor across the 2.2Kohm load resistor.  Be sure to 
observe the correct polarity or the capacitor  may explode.  Observe 
and record the waveform; use the scope cursor to determine its peak to 
peak value (   V).  Compare this value  with the value predicted by the  
formula given in class.

Use the DVM to measure the DC value of the rectified waveform.  
Compare this with the average voltage value which you calculate.

3. Repeat Step 2 for the center tapped transformer fullwave rectifier.



ELECTRONICS I       LABORATORY

FULLWAVE BRIDGE RECTIFIER

MATERIALS:      4  - DIODES
                             1  - 10uF ELECTROLYTIC CAPACITOR
                             1  -  2.2KOHM  RESISTOR

PROCEDURE:

1.  Connect the fullwave bridge rectifier circuit across the transformer
 of the CADET unit.  Measure the AC voltage across the transformer ,
 using the DVM. Use the oscilloscope to observe the waveform across 
the 2.2K load resistor.  Record its amplitude and period and draw it for 
your lab report.  Compare the measured amplitude with the value 
calculated from the AC voltage. Use the DC voltmeter to measure the 
DC value of Vout, across the load resistor.  Compare this value with 
Vavg which you calculate based upon the peak value you measured 
with the scope.  

2.  Remove one of the diodes and observe the output waveform across 
the 2.2K resistor.  draw it for your lab report.  Measure its DC voltage.

3. Replace the diode so that the fullwave bridge rectifier is operating 
properly and place the 10uF capacitor across the 2.2K resistor.  Observe 
Vout with the scope.  Measure and record its amplitude and duration.  
Compare its change in value with what you would calculate using the 
equation given in class.




EET111.htm


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ES 11-5-95