Easy sine & co-sine wave using simple Op-Amp

Published by MKDas on

Hi, you can generate pure sine wave just using an Op-Amp. It is very simple and can be used in many application. In this article, we are going to learn how to generate pure sine wave using an Op-Amp.

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How to generate pure sine and co-sine wave?

There are different ways to generate sine and co-sine wave. But You can do it one of the most simple way. 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 resistor and 3 capacitor will be enough for this circuit.

Circuit diagram:

Sine and Cosine wave generator circuit

Circuit explanation:

Here all the capacitors are non-polar ceramic capacitor. You can change the values to change the frequency. Here a start button is connected in proteus circuit only. You do not need to use it in practical circuit.

The working concept is very simple. One Op-Amp 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 square wave. And due to capacitor phase shift, we get a co-sine wave.

Simulation result:

Sine wave and cosine wave output

While simulating in proteus, press the start button once. In practical test, you do not need this.

Practical test:

Practically, the circuit was arranged in a small project board and measured with oscilloscope. Here I used variable resistors to test the effect of changing resistor values. You can do that too to do some research on sine wave.

Test circuit on project board
Output wave shape


This project was a very small one and interesting too. Who don’t like 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!


Mithun K. Das; B.Sc. in EEE from KUET. Blog: https://labprojectsbd.com


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