Experiment Description

Experiment

Experiment E25    Non-inverting Amplifier


Objectives
  • Study the input and output voltages of a non-inverting amplifier
  • Study the frequency response of a non-inverting amplifier
  • Study the input and output voltages in a voltage follower
  • Study the power amplification of a voltage follower
  • Study the high input resistance of a voltage follower
Description
In this activity, you will connect the operational amplifier to form a non-inverting amplifier.

In Experiment 1, you will vary the input voltage and record the corresponding output voltage to study its characteristics.

In Experiment 2, you will apply a signal from an a.c. source to the non-inverting amplifier. You will use a CRO to display the input signal and then the output from the amplifier. You will also study how the amplifier responds to frequency change.

In Experiment 3, you will connect the op-amp to form a voltage follower. You will vary the input voltage and record the corresponding output voltage to study its characteristics.

In Experiment 4, you will connect a load to the output of a voltage follower. The power input and power output are calculated from the readings in ammeters and voltmeters.

In Experiment 5, you will compare two methods to measure the voltage of a charged capacitor: using a moving-coil voltmeter directly and using a voltage follower with the moving-coil voltmeter.

Apparatus
operational amplifier unit [1]
dual 15 V d.c. power supply [1]
voltmeter (5 V, 10 V and 50 V) [2]
ammeter (1 mA, 10 mA and 100 mA) [2]
base meter (100 mA) [3]
single beam CRO [1]
capacitor (470 mF) [1]
battery box with 4 dry cells [1]
resistance substitution box (known resistance: 100 ohm to 470 kOhm) [1]
Experiment