Hi, you can generate a pure sine wave just using an Op-Amp. It is very simple and can be used in many applications. In this article, we are going to learn how to generate a pure sine wave using an Op-Amp.
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Table of Contents
How to generate pure sine and co-sine wave?
There are different ways to generate sine and cosine waves. But You can do it in one of the most simple ways. Just using an Op-Amp. Even you do not need any special one for this. Just use any general-purpose Op-Amp for this. 3 resistors and 3 capacitors will be enough for our “how to generate a pure sine wave using an Op-Amp” project.
Circuit diagram:
Circuit explanation:
Here all the capacitors are non-polar ceramic capacitors. You can change the values to change the frequency. Here a start button is connected to the proteus circuit only. You do not need to use it in a practical circuit.
The working concept is very simple. One Op-Amp (LM358) generates an output which is slowed by the capacitor again another Op-Amp helps in another slow movement of reference. Thus a sine wave is formed rather than a square wave. And due to capacitor phase shift, we get a cosine wave.
Simulation result:
While simulating in proteus, press the start button once. In a practical test, you do not need this.
You can read this article from our blog: How to make a Single Phase AC voltmeter using PIC16F76 & Capacitor power supply
Practical test:
Practically, the circuit was arranged in a small project board and measured with an oscilloscope. Here I used variable resistors to test the effect of changing resistor values. You can do that too to do some research on a sine wave.


Conclusion:
This project was a very small one and interesting too. Who doesn’t like a sine wave? That’s why it was really interesting to me too. I hope you enjoyed the project and made one for yourself. Thank you, Enjoy!
For Professional Designs or Help:
Check this out: 5 coolest multimeters you can buTop 5 Digital Multimeters for beginners
7 Comments
Kingsley · 31/03/2022 at 3:12 pm
Good morning sir.
Please can this circuit be used to change the waveform of a square wave inverter using sg3524 into a pure sine wave output?
If yes, how can it be interfaced? Thank you as I sincerely awaits your positive response.
MKDas · 02/04/2022 at 12:50 pm
Good morning, No, you can not use SG3524/5 to make a sine wave inverter. You must use Sinusoidal PWM.
Md likhon · 25/04/2023 at 11:49 pm
hello sir , how are you?. Sir, I need 40khz frequency sine wave signal. I will use icl8038ccjd and 741 op-Amp . Your circuit should be like this.
MKDas · 26/04/2023 at 9:29 pm
741 will not support 40Khz. use something with low noise margin. ICL8038 works up to 100KHz, no problem. There is another article on ICL8038.
MKDas · 02/04/2022 at 12:54 pm
No, you can not use 3524/25 to make sine wave inverer. You have to use SPWM.
Ose · 07/09/2023 at 6:07 am
Thank you very much Sir. Please where can this circuit find practical application? Can it be used as an oscillator stage for an inverter? I await your response.
MKDas · 08/09/2023 at 8:42 pm
When the time comes, you’ll appreciate its value. Until then, it may seem superfluous.