Solder Lore

Strongly recommended

But what is the Fourier Transform? A visual introduction.

3Blue1Brown

Why people recommend it

3Blue1Brown's animated introduction to the Fourier transform, frequently recommended to anyone who wants an intuitive feel for the frequency domain.

Watch for: Maths intuition rather than circuit practice; good before a signals course

In their words

I recommend you spent a moment and listen to this visual introduction by Grant Sanderson.

jonk on electronics.stackexchange.com, Jan 2020. CC BY-SA.

To understand why, consider the visual way of looking at the fourier transform and note that a DC signal when wrapped around would be a circle and the centre of mass will always remain at zero no matter how much you rotate it.

Aditya P on electronics.stackexchange.com, Sept 2018. CC BY-SA.

This is probably the best explanation on the internet of how waveform relates to Fourier components

Martin on electronics.stackexchange.com, Sept 2020. CC BY-SA.

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