IC741 데이터 시트보기 (PDF) - Unspecified

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IC741

Operational Amplifier

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3. Remove the lead connecting the free end of R1 to ground. Connect the free end of R1 to

the input voltage outlet. Apply a small voltage by turning the input voltage potentiometer,

so that a large value of Vout is obtained. Note this Vout. Now connect the meter to the input

voltage terminal to measure the input voltage Vi. Calculate the gain as A = Vout/Vi and

verify that its value is approximately 10.

4. Repeat the last step for three different +ve and three -ve input voltages.

5. The same configuration can be modified to set up “non-inverting” amplifier. Connect the free

end of R1 (1) to ground and the non-inverting input terminal to ground. Use the same values

of R1, Rf as in the previous setup.

6. Check if the output voltage is zero. If not, adjust the offset-null potentiometer to make it

zero.

7. Disconnect the non-inverting input terminal from the ground and connect it to the input

voltage supply. Apply a small voltage by turning the input voltage potentiometer, so that a

large value of Vout is obtained. Note this Vout. Now connect the meter to the input voltage

terminal to measure the input voltage Vi. Calculate the gain as A = Vout/Vi and verify that

it is equal to (R1 + Rf )/R1.

8. Repeat the last step for three different +ve and three -ve input voltages.

3.4 Operational amplifier as integrator

1. Set up the operational amplifier by connecting the circuit shown in Fig. 4. Use R1 = 1K and

in place of Rf connect the capacitor C, which is 0.02 µF.

2. Connect the free end of R1 (1), to a function generator producing rectangular wave.

3. Connect the output of the op-amp to a cathode ray oscilloscope (CRO).

4. Switch on the function generator and the CRO. The frequency and amplitude of the rectangular

wave has to be adjusted to get a good ramp-like output on the CRO. Trace the output wave-

form.

5. Adjust the CRO time and voltage selector knobs to obtain a magnified graph of a single ramp.

6. Measure the maximum and minimum voltage of the ramp as Vmax and Vmin. Also measure

the

time

duration

of

the

ramp as

T.

Calculate

tRC

=

. T

1−Vmin /Vmax

The

value

of

tRC

should

be approximately equal to R1C.

7

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