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Basic Operational Amplifier Circuits

  • Basic Operational Amplifier circuits in Lab

    AIM: 

    To create and setup the following basic operational amplifier circuits.




    1. Zero Crossing detector
    2. Inverting amplifier
    3. Non Inverting Amplifier
    4. Voltage follower
    5. Adder
    6. Difference amplifier
    7. Integrator
    8. Differentiator

    COMPONENTS AND EQUIPMENTS REQUIRED

    Sl no
    Components and Equipments
    Specification
    Quantity
    1
    Power Supplies
    (0 - 30) V
    2
    2
    CRO

    1
    3
    Function generator

    1
    4
    Op amp
    741
    1
    5
    Resistors
    1K, 10K, 150K
    6
    6
    Capacitors
    0.01 µF

    7
    Bread board

    1

    1. Zero Crossing Detector

    Procedure:

    1. Create the operational amplifier as zero crossing detector.
    2. Supply a 100mV sine wave at the i/p  and confirm whether the o/p  is square wave wavering from +13V to - 13V.

    Circuit Diagram and Waveform of Zero Crossing Detector
    2. Inverting Amplifier:

    Procedure:

    1. Create the inverting amplifier on the bread board
    2. Supply a 2 Vpp sine wave and watch the i/p  and o/p  consecutively on CRO. Make Sure whether the o/p  is 20Vpp sine wave with 1800 out of phase with the i/p .
    3. Differ the frequency of the i/p  from 0 to a few MHz. Record the o/p  voltage. Draw the frequency response characteristics.

    Circuit Diagram and Waveform of Inverting Amplifier

    Tabular Column

    f (KHz)
    Vo (Volts)
    log f
    20 log(Vo/Vin)db
    100 Hz
    20 V
    2 Hz
    20
    200 Hz
    18
    2.3 Hz
    19.08
    500 Hz
    18
    2.6
    19.08
    20 KHz
    16
    4.3
    18.06
    21
    16
    4.32
    18.06
    22
    14
    4.34
    16.90
    30
    12
    4.47
    15.56
    40
    10
    4.60
    13.97
    50
    8
    4.69
    12.04
    60
    8
    4.77
    12.04
    70
    6
    4.84
    9.54
    80
    4
    4.90
    6.02
    100
    4
    5.0
    6.02
    200
    2
    5.3
    0

    3. Non Inverting Amplifier

    Procedure:

    1. Create the non inverting amplifier on the bread board
    2. Supply a 2 Vpp sine wave and examine the i/p and o/p concurrently on CRO. Make Sure whether the o/p  is 20Vpp sine wave in phase with the i/p .
    3. Differ the frequency of the i/p from 0 to a small amount of MHz. Record the o/p voltage. Draw the frequency response characteristics.

    Circuit Diagram and Waveform of Non Inverting Amplifier
    Tabular Column

    f (KHz)
    Vo (Volts)
    log f
    20 log(Vo/Vin)dB
    1
    24
    3
    21.58
    10
    24
    4
    21.58
    15
    22
    4.17
    20.82
    17
    20
    4.23
    20
    19
    18
    4.27
    19.08
    20
    18
    4.30
    19.08
    23
    16
    4.36
    18.06
    25
    14
    4.40
    16.90
    30
    14
    4.47
    16.90
    32
    12
    4.50
    15.56
    36
    10
    4.55
    13.97
    40
    10
    4.60
    13.97
    45
    8
    4.65
    12.04
    65
    6
    4.81
    9.54
    100
    4
    5
    6.02
    200
    2
    5.30
    0

    4. Voltage follower:

    Procedure:

    1. Make the voltage follower circuit on a bread board.
    2. Supply a 2 Vpp Sine wave snd watch the i/p and o/p at the same time on CRO. Confirm whether the o/p  is 2 Vpp sinewave in phase with i/p .

    Circuit Diagram and Waveform of Voltage follower
    5. Adder

    Procedure:

    1. Make the adder circuit on breadboard.
    2. Supply the i/p and confirm the o/p.

    Circuit Diagram and Waveform
    6. Difference Amplifier

    Procedure:

    1. Make the difference amplifier on breadboard.
    2. Supply the i/p and confirm the o/p.

    Circuit Diagram and Waveform of Difference Amplifier
    7. Integrator

    Procedure:

    1. Make the integrator circuit on the bread board
    2. Supply a 2 Vpp 1ms square wave and examine the variation at the i/p and o/p at the same time on CRO.
    3. Differ the dc offset of the square wave and watch the variation in the o/p waveform.
    4. Do again the test by supplying the triangular wave in addition to sine wave at the i/p  and examine the o/p  
    5. Supply a sine wave to the i/p and record the o/p amplitude by altering the frequency of the sine wave. Enter it in the tabular column.

    Circuit Diagram and Waveform of Integrator
    Tabular Column

    f (KHz)
    Vo (Volts)
    log f
    20 log(Vo/Vin)db
    1
    4
    3
    6.02
    1.5
    3
    3.17
    3.52
    2
    2
    3.30
    0
    2.5
    2
    3.30
    0
    3
    1.2
    3.0
    -4.43
    4
    0.8
    2.90
    -7.95
    5
    0.6
    2.77
    -10.45
    6
    0.6
    2.77
    -10.45
    7
    0.4
    2.60
    -13.97
    10
    0.1
    2
    -26.02

    8. Differentiator

    Procedure:

    1. Make the differentiator circuit on the bread board
    2. Supply a 2 Vpp 1ms square wave and monitor the dissimilarity at the i/p and o/p at the same time on CRO.
    3. Do again the test by supplying the triangular wave and sine wave at the i/p and view the o/p  
    4. Supply a sine wave to the i/p and record the o/p  amplitude by altering the frequency of the sine wave. Enter it in the tabular column.

    Circuit Diagram and Waveform of Differentiator
    Tabular Column

    f (Hz)
    Vo (Volts)
    log f
    20 log(Vo/Vin)db
    200
    0.6
    2.30
    -10.45
    300
    0.9
    2.47
    -6.94
    500
    1.3
    2.69
    -3.74
    700
    1.6
    2.85
    -1.95
    900
    2
    2.95
    0
    1 K
    2
    3
    0
    1.2 K
    2
    3.08
    0
    1.8 K
    2
    3.25
    0
    10 K
    2
    0
    0

    Result: Basic Operational Amplifier Circuits are set up and designed.



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