A harmonic of a wave is a component frequency of the signal that is an integer multiple of the fundamental (main) frequency. Different waves have different multiples. Square waves have odd integer multiples, i.e. the harmonic frequencies will be 3 x f, 5 x f, 7 x f, etc., where f = the fundamental frequency.To take an example, if the fundamental frequency of a square wave is 100 Hz, the frequencies of the next harmonics are: 300 Hz (1st harmonic), 500 Hz (2nd harmonic), 700 Hz (3rd harmonic), etc.

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