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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