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RE: Filtering out distortion in a sine wave

Posted by andyr (M) on July 5, 2025 at 21:36:05

In Reply to: Filtering out distortion in a sine wave posted by Mushroom Soup on February 26, 2025 at 19:29:31:

"And harmonics is what harmonic distortion is, right?"

Good question - as I actually don't know the complete answer.

What you need for your TT power source is a nice, smooth, 60Hz sine wave, right. We can call this an "undistorted" sine wave.

On a CRO screen, this looks like a thin (sine) wave.

Whereas a "fuzzy" sine wave looks like a thick line on the CRO screen. This is what your actual mains feed looks like.

But I would think this 'fuzz' is not caused by harmonics of the base 60Hz sine wave; it's due to something else entirely.

So I wouldn't call it a "sine wave with added harmonic distortion". I would call it a "dirty sine wave"!

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