Sine Wave Generator using IC 741 OP AMP Operational Amplifier

Sine Wave Generator Description:

Sine Wave Generator using IC 741 OP AMP Operational Amplifier- In this tutorial, you will learn how to make a stable Sine Wave Generator or Oscillator using IC 741 Op Amp Operational Amplifier; using a very few electronic components like resistors, capacitors, and diodes.

Before you follow the rest of the tutorial, I highly recommend reading my articles on

LM741 Op Amp complete guide

What is a resistor and its types?

What is capacitor and its types?

Sine Wave Generator Circuit Diagram:

The Sine Wave Generators or Oscillator normally produces an almost stable Sine wave with an output that keeps fluctuating a bit. In the circuit below the IC 741 produces the sine wave.

At 15 volts input supply, it produces 11 Volts peak to peak signal. Its output is quite stable and correct. This circuit also works perfectly at 12 volts input supply. At A and B the voltage produced is 90 degrees out of phase.

This circuit has a frequency of 3.3 kHz which can be varied using the capacitors C1, C2, and C3. If the values of the capacitors are increased 8 times, the frequency of the circuit will become 42 cycles. i.e. if the values of the capacitors are changed to

C2 = .022uf while

C1 and C3 = .01uf the Oscillator can be run on 50 cycles per second.

List of components used in the making of Sine Wave Generator:

R1, R5 = 220K ohm, ¼ watt

R2 = 100K ohm, ¼ watt

R3 = 5K ohm, ¼ watt

R4 = 2K ohm, ¼ watt

C1, C3 = 150pF

C2 = 300pF

C4 = 10pF

D1, D2 = 3.9 volt Zener diodes

IC1, IC2 = 741