Opamp Voltage Follower Circuit | Using Op-Amp | 741 IC | Linear Integrated Circuits Lab Experiments |Engineering | Diploma Polytechnic Students
Aim: To design and setup a voltage follower circuit with OPAMP IC 741C and observe the
waveforms.
Equipments/Components:
Sl. No Name and Specification Quantity required
1 Dual power supply +/- 15V 1
2 Function generator (0- 1MHz) 1
3 Oscilloscope 1
4 Bread board 1
5 IC 741C 1
6 Probes and connecting wires As required.
Principle:
A voltage follower (also called a unity-gain amplifier or buffer amplifier or isolation
amplifier) is an op-amp circuit which has a voltage gain of 1. This means that the op amp
does not provide any amplification to the signal. It is called a voltage follower because the
output voltage follows the input voltage; means the output voltage is same as the input
voltage. Though the gain is unity, this circuit offers high input impedance and low output
impedance and hence it is used as buffer , which is used to isolate a low impedance load from
a voltage source to eliminate any loading that might occur.
Procedure:
1. Check the components.
2. Setup the circuit on the breadboard and check the connections.
3. Switch on the power supply.
4. Give 2Vpp/ 1 KHz sine wave as input.
5. Observe input and output on the two channels of the oscilloscope simultaneously.
6. Note down and draw the input and output waveforms on the graph.
7. Verify that the input and output waveforms are same in magnitude and phase.
Design:
The voltage follower is a non-inverting amplifier with unity gain.
A = 1+ R f / Ri = 1
Or R f / Ri = 0
Therefore R f = 0
Observation:
Vi = ?
Vo = ?
Voltage gain = Vo / Vi = ?;
Phase difference between input and output waveforms = ?
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