VSA GROUP OF INSTITUTIONS VSA GROUP OF INSTITUTIONS VSA SCHOOL OF ENGINEERING SALEM DEPARTMENT OF ELECTRONICS & COMMUNICATION ENGINEERING Name: ………………………………........ Reg. No. : Class: ………………………………. Semester: ………………… Subject: ……………………………. Sub. Code:……………… Department Of ECE 1
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VSA GROUP OF INSTITUTIONS
VSA GROUP OF INSTITUTIONSVSA SCHOOL OF ENGINEERING
SALEM
DEPARTMENT OF ELECTRONICS & COMMUNICATION ENGINEERING
EXP.No DATE NAME OF THE EXPERIMENTS PAGE NO. MARKS STAFF SIGN.
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EX.NO: 1 SERIES AND SHUNT FEEDBACK AMPLIFIERSDATE:
AIM:(i)To design and construct the Voltage Shunt feedback amplifier and to obtain its frequency response curve for with and without feedback.(ii)To design and construct the Current Series feedback amplifier and to obtain its frequency response curve for with and without feedback.
(i) VOLTAGE SHUNT FEEDBACK AMPLIFIER
APPARATUS REQUIRED:
S.No Components Range Quantity
1. Transistor BC107 1
2. Resistor 600Ω,4KΩ,4.7KΩ,10KΩ 1
3. Function Generator - 1
4. Cathode Ray Oscilloscope - 1
5. Regulated Power Supply (0-30)V 1
6. Probe - 2
7. Connecting wires - -
8. Bread Board - 1
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PIN CONFIGURATION: SYMBOL:
BC107
E
C
B
CIRCUIT DIAGRAM:(i) Without Feedback
B C 1 0 7
R c4 k
R e
R 1
R 21 0 k
R s
6 0 0 R L
4 . 7 k
C i
C o
C e
V C C = 1 0 V
F G
CRO
0
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DESIGN:Given
ii) With Feedback
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B C 1 0 7
R c4 k
R e
R 1
R 21 0 k
R s
6 0 0 R L
4 . 7 k
C i
C o
C e
V C C = 1 0 V
F G
CRO
0
R f
6 8 k
C f
TABULATION:
(ii) CURRENT SERIES FEEDBACK AMPLIFIER
APPARATUS REQUIRED:
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S.No.
With FB With out FB
Frequency (Hz)
Output Voltage (Volts)
Gain = 20log(Vo/Vi) (dB)
Frequency (Hz)
Output Voltage (Volts)
Gain = 20log(Vo/Vi)(dB)
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S.No Components Range Quantity1. Transistor BC107 1
2. Resistor 600Ω,4.7KΩ,10KΩ 1
3. Function Generator - 1
4. Cathode Ray Oscilloscope - 1
5. Regulated Power Supply (0-30)V 1
6. Probe - 2
7. Connecting wires - -
8. Bread Board - 1
PIN CONFIGURATION: SYMBOL:
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BC107
E
C
B
CIRCUIT DIAGRAM:(i)Without Feedback
B C 1 0 7
R c
R e
R 11 0 k
R 2
R S
6 0 0R L4 . 7 k
C i
C o
C e
V C C =1 0 V
0
F G
CRO
DESIGN:
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Given
(ii) With Feedback
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B C 1 0 7
R c
R e
R 11 0 k
R 2
R S
6 0 0R L4 . 7 k
C i
C o
V C C =1 0 V
0
F G
CRO
TABULATION:
(ii) CURRENT SERIES FEEDBACK AMPLIFIER Vi = Volts
S.No.
With FB Without FB
Frequency (Hz)
Output Voltage (Volts)
Gain = 20log(Vo/Vi) (dB)
Frequency (Hz)
Output Voltage (Volts)
Gain = 20log(Vo/Vi)(dB)
PROCEDURE
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1. Connections are given as per the circuit diagram.2. Apply 10V dc supply to the collector and base of transistors.3. Set the I/P voltage using Function generator and vary the frequency in desired range.4. For each frequency note down the corresponding O/P voltage values.5. Repeat the same procedure for with feedback amplifier circuit.
6. Graphs are plotted as gain versus frequency for the tabulated readings.
MODEL GRAPH:
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f1’ f1 f2 f2
’
Frequency (Hz)
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X
With out FB
With FB
3dB
3dB
Gain (dB) Ao
0.707Ao
Y
Ao’
0.707Ao’
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RESULT
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VIVA:
1. What is Feedback? What are its types?
2. Which type of FB is used in amplifiers?
3. Give any 4 merits of negative FB?
4. Define desensitivity.
5. What do you meant by Sampling and mixing in the context of FB amplifiers?
Ex. No: 2 HARTLEY AND COLPITTS OSCILLATORS
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DATE:
AIM:(i)To design and construct a Hartley oscillator circuit to generate a sine
waveform.(ii) To design and construct a Colpitts oscillator circuit to generate a sine
waveform.
(i) HARTLEY OSCILLATOR
APPARATUS REQUIRED:
S.No Components Range Quantity1. Transistor BC548 1
2. Resistor 390Ω,270KΩ 1
3. Capacitor 1nF,0.02µF,0.1µF,47µF 1
4. Radio Frequency Choke 30mH 1
5. Cathode Ray Oscilloscope - 1
6. Regulated Power Supply (0-30)V 1
7. Probe - 2
8. Connecting wires - -
9. Bread Board - 1
DESIGN:
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PIN CONFIGURATION: SYMBOL:
BC548
E
C
B
CIRCUIT DIAGRAM:
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0
B C 5 4 8
R e3 9 0
R b
2 7 0 k
C
0 . 0 2 u F
C i
4 7 u F
C e
0 . 1 u F C o1 n
R F C3 0 m H
1
2
L 1
1
2
L 2
1
2
V C C =1 0 V
0
CRO
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PROCEDURE:1. Connections are given as per the circuit diagram.2. Switch on the dc power supply and apply 10V as bias voltage.3. Sine wave output is obtained and the readings are tabulated.4. Graph is plotted by taking time period along X-axis and voltage along Y-
axis.
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(ii) COLPITTS OSCILLATOR
APPARATUS REQUIRED:
S.No Components Range Quantity1. Transistor BC107 12. Resistor 2.2KΩ,100KΩ
1. Connections are given as per the circuit diagram.2. Switch on the dc power supply and apply 12V as bias voltage.3. Sine wave output is obtained and the readings are tabulated.4. Graph is plotted by taking time period along X-axis and voltage along Y-axis.
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PIN CONFIGURATION: SYMBOL:
BC107
E
C
B
DESIGN:
CIRCUIT DIAGRAM:
B C 1 0 7
R e2 . 2 k
R 1
1 0 0 k
V C C =1 2 V
0
CRO
R c4 7 k
R 24 7 k
C e1 0 u F
C o
1 0 u FC i
0 . 1 u F
C 1
0 . 2 u F
C 2
0 . 0 2 u F
L1 2
0
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MODEL GRAPH:
TABULATION:
S.NoType
Amplitude Time period
Unit Volts ms
1. Hartley oscillator
2. Colpitts oscillator
VIVA:1.State Barkhausen criterion.2.What is the use of RFC?3.How do Hartley differ from Colpitts oscillator?4.Give the frequency range of Hartley and Colpitts oscillator.
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RESULT:
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Ex. No: 3 RC PHASE SHIFT AND WIEN BRIDGE OSCILLATORSDATE:
AIM:(i)To design and construct a RC phase shift oscillator circuit to generate a
sine waveform.
(ii) To design and construct a Wien bridge oscillator circuit to generate a