See: Fourier Theorem, Oscillator. Compare: Pulse, Sawtooth Wave. Triangular wave, its description as a Fourier series, and as a line spectrum. Triangle wave at 100 Hz.

Today we buffer, and get that triangle wave out to our amplifiers. But as long as we’re amplifying, we might as well overdrive the amps and head off to the land of distortion. We’ll do just ...