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By-Ajay Ahlawat: Experiment 5: To Design Operational Amplifier (Non-Inverting) of Gain 10

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AMPLEFIRE

EXPERIMENT 5: TO DESIGN OPERATIONAL


AMPLIFIER (NON-INVERTING) OF GAIN 10.

By-Ajay
Ahlawat
To design and implement the given circuit of
Operational Amplifier and show its non-Inverting
behaviour.

3 terminal Op-amp, a
Breadboard (small), connecting wires, AC voltage
source, ground terminal, standard resistances.

the inoonninve a i i are designed


using an Operational amplifier. In the op-amps there
are three basic terminals among those three two will
be the input terminals and one is for output
consideration. The applied input to the respective
terminal decides whether it is an inverting one or
non-inverting one. If it is inverting the input is applied
to the negative terminal otherwise if the input is
applied to the non-inverting/positive terminal.
The circuit designed for a non-inverting amplifier
consists of a basic oo-amp where the input is
connected to a non-inverting terminal. The output
obtained from this circuit is a non-inverted one. This
is again feedback towards input but to the inverting
terminal via a resistor. Further, one more resistor is
connected to the inverting terminal in concern to
connect it to the ground.
hence the overall gain of the circuit is dependent on
these two resistors that are responsible for the
feedback connection. Those two resistors will behave
as a voltage divider of the feedback fed to the
inverting terminal. Generally, R2 is chosen to be
greater than the R1.

Non-Inverting Amplifier Gain:


The construction al view of the non-inverting
amplifier it can be considered that the inputs
applied at both the terminals are the same. The
voltage levels are the same and even the
feedback is dependent on both the resistors R1
and R2. In this way, it makes simple and easy to
determine the gain for such types of amplifiers.
As the voltage levels applied for both the
terminals remain the same indirectly results in
the gain levels to be high.
The voltage level determined at the inverting
terminal is because of the presence of the
potential-divider circuit. Then this results in the
equaton of the voltage that is:

But the gain is the ratio between the ratios of


the output values to input values of the applied
signals.

Where;
A, represents the overall gain obtained in the
circuit.
R s represents the resistance connected to the
ground.
R2 represents the resistor connected to the
feedback.
The resistance considered in the above
equation is in ohms.

Output Wave forms:


This amplifier generates the output the same as
that of the applied input signal. Both the signals
that are applied input and the generated
output are in phase. Because of this reason, the
potential difference across both the terminals
remains the same.

Output Wave form of the Non-Inverting


Amplifier
5000

570265MI
Chart Title

1 *

1. Before connecting the power supply plug into


socket, ensure power supply should be
switched off.

2. Ensure all connections should be tight before


switching on the power supply.

3. Power supply should be switched off after


completion of experiment.

1. In this AC source of 750mV was taken with R1=


1kohm and R2=9kohm and the graph was plot
between log(F) Vs Gain.
2. The phasor graph shows that it Is Non-Inverting
Amplifier.

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