APPLICATIONS OF OP-AMP - I ( INVERTING AND NON – INVERTING AMPLIFIER) - Computer Programming

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## Monday, April 4, 2011

Expt. No.1                                    APPLICATIONS OF OP-AMP - I
( INVERTING AND NON – INVERTING AMPLIFIER)

1. a.  INVERTING AMPLIFIER

AIM:

To design an Inverting Amplifier for the given specifications using Op-Amp IC 741.

APPARATUS REQUIRED:

 S.No Name of the Apparatus Range Quantity 1. Function Generator 3 MHz 1 2. CRO 30 MHz 1 3. Dual RPS 0 – 30 V 1 4. Op-Amp IC 741 1 5. Bread Board 1 6. Resistors As required 7. Connecting wires and probes As required

THEORY:

The input signal Vi is applied to the inverting input terminal through R1 and the non-inverting input terminal of the op-amp is grounded.  The output voltage Vo is fed back to the inverting input terminal through the Rf - R1 network, where Rf   is the feedback resistor.  The output voltage is given as,

Vo = - ACL Vi

Here the negative sign indicates that the output voltage is 1800 out of phase with the input signal.

PRECAUTIONS:

1. Output voltage will be saturated if it exceeds   ± 15V.

PROCEDURE:

1. Connections are given as per the circuit diagram.
2. + Vcc and - Vcc supply is given to the power supply terminal of the Op-Amp IC.
3. By adjusting the amplitude and frequency knobs of the function generator, appropriate input voltage is applied to the inverting input terminal of the Op-Amp.
4. The output voltage is obtained in the CRO and the input and output voltage waveforms are plotted in a graph sheet.

PIN DIAGRAM:

CIRCUIT DIAGRAM OF INVERTING AMPLIFIER:

DESIGN:

We know for an inverting Amplifier ACL = RF / R1
Assume R1 (approx. 10 KΩ) and find Rf
Hence Vo(theoretical)  = - ACL Vi

OBSERVATIONS:

 S.No. Amplitude( No. of div x Volts per div ) Time period( No. of div x Time per div ) Input Output Theoretical - Practical -

MODEL GRAPH:

RESULT:

The design and testing of the inverting amplifier is done and the input and output waveforms were drawn.

1. b.  NON - INVERTING AMPLIFIER

AIM:

To design a Non-Inverting Amplifier for the given specifications using Op-Amp IC 741.

APPARATUS REQUIRED:

 S.No Name of the Apparatus Range Quantity 1. Function Generator 3 MHz 1 2. CRO 30 MHz 1 3. Dual RPS 0 – 30 V 1 4. Op-Amp IC 741 1 5. Bread Board 1 6. Resistors As required 7. Connecting wires and probes As required

THEORY:

The input signal Vi is applied to the non - inverting input terminal of the op-amp.  This circuit amplifies the signal without inverting the input signal.  It is also called negative feedback system since the output is feedback to the inverting input terminals.  The differential voltage Vd at the inverting input terminal of the op-amp is zero ideally and the output voltage is given as,

Vo =   ACL Vi

Here the output voltage is in phase with the input signal.

PRECAUTIONS:

1. Output voltage will be saturated if it exceeds ± 15V.

PROCEDURE:

1. Connections are given as per the circuit diagram.
2. + Vcc and - Vcc supply is given to the power supply terminal of the Op-Amp IC.
3. By adjusting the amplitude and frequency knobs of the function generator, appropriate input voltage is applied to the non - inverting input terminal of the Op-Amp.
4. The output voltage is obtained in the CRO and the input and output voltage waveforms are plotted in a graph sheet.

PIN DIAGRAM:

CIRCUIT DIAGRAM OF NON INVERITNG AMPLIFIER:

DESIGN:

We know for a Non-inverting Amplifier ACL = 1 + (RF / R1)
Assume R1 ( approx. 10 KΩ )  and find Rf
Hence Vo = ACL Vi

OBSERVATIONS:

 S.No. Amplitude( No. of div x Volts per div ) Time period( No. of div x Time per div ) Input Output Theoretical - Practical -

MODEL GRAPH:

RESULT:

The design and testing of the Non-inverting amplifier is done and the input and output waveforms were drawn.