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JawaharlalNehruEngineeringCollege
LaboratoryManual
EDC-II
For
Second Year Students
Manual made by
Prof. Neha Kanungo
Author JNEC, Aurangabad
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JawaharlalNehruEngineeringCollege
TechnicalDocument
This technical document is a series of Laboratory manuals of Electronics and Telecommunication Department and is a certified document of Jawaharlal Nehru engineering College. The care has been taken to make the document error-free. But still if any error is found, kindly bring it to the notice of subject teacher and HOD.
Recommended by.
HOD
Approved by.
Principal
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FOREWORD
ItismygreatpleasuretopresentthislaboratorymanualforsecondyearengineeringstudentsforthesubjectofElectronicDevices&circuitsIItounderstandandvisualizethebasicconceptsof variouscircuitsusingICs.ElectronicDevices&circuitsIIcoversbasicconceptsofelectronics.Thisbeingacoresubject,itbecomesveryessentialtohavecleartheoreticalanddesigningaspects.
Thislabmanualprovidesaplatformtothestudentsforunderstandingthebasicconceptsofelectronicdevicesandcircuits.Thispracticalbackgroundwillhelpstudentstogainconfidenceinqualitativeandquantitativeapproachtoelectroniccircuits.
GoodLuckforyourEnjoyableLaboratorySessions.
H.O.DECTDept
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LABORATORYMANUALCONTENTS
This manual is intended for the Second Year students of ECT/IE branches in the subject of Electronic Devices & Circuits-II. This manual typically contains practical/ Lab Sessions related to Electronic Devices & Circuits covering various aspects related to the subject for enhanced understanding.
Students are advised to thoroughly go through this manual rather than only topics mentioned in the syllabus as practical aspects are the key to understanding and conceptual visualization of theoretical aspects covered in the books.
Good Luck for your enjoyable Laboratory Sessions.
Prof. Neha Kanungo
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SUBJECTINDEX:
1. Dos and DONTs in Laboratory.
2. Lab Exercise. 1. To study of the two stage RC coupled Amplifier using Transistor.
2. To study of Class A Transformer Coupled Amplifier.
3. To study of UJT Saw tooth generators.
4. To study of LC Oscillator.
5. To study of Hartley Oscillator.
6. To study different waveform of Clipper & Clamper Circuit.
7. To study of Push Pull amplifier.
8. To study of Astable, monostable & bistable multivibrator
3. Conduction Viva- Voce Examination.
4. Evaluation and Marking Systems.
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Exercise No.1 :(2 Hours):- 1 Practical
Aim :- To study the two stage RC Coupled Amplifier using Transistor.
Apparatus :- Signal Generator, CRO dual channel, Patch chords.
Circuit Diagram :-
Vcc12V
+
Vs110V
S1Cf1uF
C31uF
Ce21uF
Q2NPN
Ce11uF
C11uF
C21uF
Q1NPN
Rf1k
Re21k
R41k
Rc21k
R31k
Rc11k
R21k
R11k
Re11k
Formula:- AV=AV1*AV2
Where AV = Overall voltage gain. AV1= Voltage gain of first stage.
Av2= Voltage gain of second stage.
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Procedure:-
1) Study the circuit provided on the front panel of the kit. 2) Connect the signal generator at the input terminals of the circuit. 3) Connect the CRO at the output of the fist stage. 4) Switch on the power supply. 5) Keep the input signal amplitude Vi constant so that transistors should not enter in
saturation. Now vary the input frequency Fi from 50 Hz to 100kHz in steps. Observe & note the corresponding output voltage Vo . Find out the voltage gain Av.
6) Plot the graph between input frequency & voltage gain. 7) Observe & note the output voltage at collector of Q1.Caculate the gain of the first stage
AV1. 8) Observe & note the output voltage at collector of Q2.Caculate the gain of the first stage
AV2.
Observation Table:-
For overall Gain
S.NO. I/P Frquency Fi I/P Voltage Vi O/P
Voltage Vo Gain Av = Vo / Vi
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For First Stage
S.NO. I/P Frquency Fi I/P Voltage Vi O/P
Voltage Vo
Gain Av1 = Vo1 / Vi
For Second Stage
S.NO. I/P Frquency Fi I/P Voltage Vi O/P Voltage Vo
Gain Av1 = Vo1 / Vi
Result:- AV1 = ---------, AV2 = ---------, AV = -------
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Exercise No.2:(2 Hours):- 2 Practical
Aim :- To study of class A transformer coupled amplifier, its frequency response & bandwidth.
Apparatus :- Signal Generator, CRO, Patch chords.
Component Used :- Q = BC 148, R = 6.8K, R = 470, R = 560, C = 10F, C = 10F, R = 10K.
Circuit Diagram :-
+V
Vcc6V
+Vi10V
T110TO1
Ce1uf
C11uF
Q1NPN
R41k
R31k
R21k
R11k
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Procedure:
1. Study the circuit provided on the front panel of the kit. 2. Connect the signal generator at the input terminals. 3. Connect the CRO at the output terminals. 4. Switch on the power supply. 5. Apply a sine wave I/P around of 1KHz, Adjust the amplitude so that transistor should not enter in saturation. 6. Now increase I/P frequency Fi from 100 Hz to 200 KHz in suitable steps, Observe & note the
corresponding O/P voltage VO. Determine its gain. 7. Plot the graph, frequency of I/P Fi VS gain. Determine its bandwidth.
Formule :-
Resistance across the secondary RL = 2 RL where = N1/ N2
PL = VC(rms) IC(rms) Pi(dc) = 2 VC(rms) IC(rms) = PL / Pi(dc) = VC(rms) IC(rms) / 2 VC(rms) IC(rms) = 50
Bandwidth BW = fH - fL
Observations :-
Input voltage (Vi) = -------(constant)
I/P Frequncy Fi
O/P Voltage VO
Gain AV = VO/ Vi
100 Hz
100 KHz
Result: ThebandwidthoftransformercoupledclassAamplifierisfoundtobe
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ExerciseNo.3:(2Hours):1Practical
Aim :- To study of UJT as relaxation oscillator.
Appartus :- Circuit Board, Power Supply, CRO, probes, Connecting Wires
Components Used :- UJT 2N 2646, Resistance of 1K, Variable resistance 1K, Capacitor 0.1 f
Circuit Diagram :-
+V310V
+VBB10V
D1DIODE
R610k40%
V1
10V
C11uF
R310k40%
Q1NPN
R51k
R41k
R21k
R11k
Conclusion :- Hence we have studied UJT relaxation oscillator.
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ExerciseNo.4:(2Hours):1Practical
Aim :- To study the circuit of Collpitts or LC Oscillator & Determine the frequency of Oscillator .
Appartus :-Digital multimeter, CRO, Capacitance & Inductance Meter.
Circuit Diagram :-
S2S1
Co0.001uf
Ce0.1uf
V110V
Ci0.001uf
Q1NPN
C31uF
C21uF
C11uF
T1IFT
Re1k
R222K
R1100k
Rc3K
Procedure:-
1. Study the circuit provided on the front panel of the kit. 2. Connect CRO at O/P Vo terminal. 3. Now switch ON the power supply note different voltages as per observation table. 4. Observe & note the frequency of oscillation & amplitude on CRO. 5. Calculate the theoretical frequency of oscillation using formula. 6. Compare theoretical & practical frequency of oscillation. 7. Change the values of capacitor C & repeat above procedure.
Observation:-
1) Quiescent operating point: VCC = ---------volt VCE = -------- Volt
VE = ------ volt IC = IE = VE / RE = ------------- mA
2) Observed frequency of oscillation FO = ------KHz
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3) Amplitude of O/P V0 = ------ V 4) Theoretical Frequency FO = ----- KHz
Result :- The tank circuit from by center tap capacitor C , C & inductor Lprovides feedback to transistor amplifier which produces a sine wave O/P in RF so Collpitts Oscillator is also called as RF Oscillator its frequency of oscillations is practically----- Hz & theoretically----- Hz.
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ExerciseNo.5:(2Hours):1Practical
Aim :To study the circuit of Hartley Oscillator.
ApparatusRequired: Digital multimeter, CRO , Patch chords, Inductance & capacitance.
CircuitDiagram:Vcc12V
S2S1
T110TO1
C2C1
Co0.001uf
Ce
0.1uf
Ci0.001uf
Q1NPN
Rf1k
R222k
R1100K
Rc3K
Formula:F = 1 / 2LC Where L = L1 + L2 + 2M If mutual inductance M is neglected then
L = L1 + L2 Procedure:-
1. Study the circuit provided on the front panel of the kit. 2. connect the CRO at VO terminal. 3. Now switch ON the power supply note the different voltage at Vo. 4. Observe & note frequency for the frequency of oscillations and amplitude on CRO for
the different values of capacitanceC. 5. Calculate the theoretical frequency of oscillations using the formula. 6. Compare theoretical & practical frequencies of oscillations.
Conclusion:Thefrequencyofoscillatoris Hz&Inductanceofoscillatoris H.
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ExerciseNo.6:(2Hours):1Practical
Aim :- To study different waveforms of clippers & clampers.
Appartus :-Function Generator(1 MHz), CRO(30 MHz), probes, Connecting Wires
Components Used :- Diode IN4007, Resistor 1K, Capacitor 0.1f.
Circuit Diagram :-
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C41uF
+
V810V
D11DIODE
+
V710V
D10DIODE
+
V610V
D9DIODE
+
V510V
D8DIODE
C31uF
C21uF
+V410V
D7DIODE
+V310V
C11uF
D6DIODE
D5DIODE
+V210V
+V110V
D4DIODE
D2DIODE
D3DIODE
D1DIODE
R51k
R81k
R71k
R41k
R31kR2
1k
R11k
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Procedure:- 1. Make the connections as per the circuit diagram shown in figure. 2. Observe & draw waveforms of all types of clippers with bias. 3. Observe & draw waveforms of all types of clampers with bias.
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ExerciseNo.8:(2Hours):8Practical
Aim :- To study of Push Pull Amplifier.
Appartus :-Signal Generator, CRO(dual trace), Connecting Wires
Components Used :- Transistor Q1 & Q2= bc 148 Driver, T1 & T2 = 6-0-6 v
Circuit Diagram :-
A
B
10kHz
1/1V
12V
+12V
2N2905A
2N2219A
1.26uF
16k
1k
1k
16k
50
A
B
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Procedure :- 1. Study the circuit diagram provided on the front panel of the kit. 2. Connect the sine wave generator to the input terminals. 3. Connect Dual Trace CRO at input & output side, 4. Switch ON the power supply. 5. Apply a sine wave I/P from signal generator at I/P Vin of circuit. 6. Now keep the amplitude Vin constant. Vary the I/P frequency Fi from 100 Hz to 200KHz
in steps. Observe & note the corresponding O/P voltage VO. Calculate the voltage gain AV = VO / Vin.
7. Repeat step 6 for different frequencies. 8. Plot a graph between I/P frequency Fi (on X-axis) & voltage gain AV (on Y-axis). Find out
the bandwidth from graph.
Observations :- Vin = --------V(constant)
S.No. Input Frequency Fi
Output voltage Vo AV = VO / Vin.
1 2 3 4 - - - -
100 Hz 500 Hz 1 KHz 2 KHz
- - -
200 KHz
Formulas :- Poac = I 2 RL
Result:-The frequency response of Class- B Push pull amplifier is studied having bandwidth
BW = --------- Hz.
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ExerciseNo.9:(2Hours):9PracticalAim :- To study of astable, monostable & bistable multivibrator.
Appartus :- 741 op-amp, diodes
Circuit Diagram :-
.IC5V
.IC0V
DC B
A
+8V
2N39042N3904
618pF 1.55nF
1N914 1N914
1k 47k 1k47k
DC B
A
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B A.NS10V
.NS0V
10kHz
0/10V
10V
+10V
2N39042N3904
200pF 200pF
1N914 1N914
200pF 200pF
1k
39k
1k
39k
390k390k
10k10k
B A
A Output
5V
1kHz
10/0V
+10V
2N39042N3904
.02uF
100pF
1N914 1N914
100pF
1k 1k
47k
470k
10k
15k
A
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