When people modulate their tesla coils to play music, it sounds like a very sharp square wave, as opposed to the electrical signal, a (roughly) sine wave. Why doesn't the tesla coil sound like a sine wave, which would match the electrical signal?
Electrical – Why do musical tesla coils sound more like square waves
sinesoundsquaretesla-coilwaveform
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Best Answer
This modulation is done using an "interrupter", which turns the coil on and off at the right frequencies to generate the notes. The output of the interrupter is a square wave. The output from the topload is sinusoidal, but the frequency of each burst is too high for the human ear to perceive. Therefore you only hear the output from the interrupter.