Finding the harmonics created by a Qucs Simulation
Channel: Gary Fox
Date: 2014-11-10

Sometimes it is necessary to make your own tools, even if those tools are software programs.  Qucs is a great program to simulate circuits and shows the output wave shape.  However, we are interested in the frequencies generated.   To determine those it was necessary to write a fairly simple program to change from the "time domain" to the "frequency domain".
That procedure is called the Fourier Transform.
After doing the Fourier Transform I then do the Inverse transform and take all those harmonics and add them up to see how close the sum of the components are to the original waveform.  (I called that rebuilding in the video.)
I have an associated post on my web page.  There you will find a detailed explanation of the steps in the program as well as many links describing the programs I used in this video.
http://create-and-make.com/finding-the-frequency-components-of-a-qucs-output/