The end goal is I need to convert a sinusoidal into a square wave using a zero crossing circuit. I have a voltage that ranges from 0 to 400vrms @70kHz from a capacitor that is part of an induction heater tank circuit. My comparator has a peak differential input of +/- 35v so I need to reduce the capacitor voltage by a factor of 10 without significantly shifting the phase. I have tried using low inductance resistors as a divider but they still shift the waveform to the left. I have tried using a capacitative divider but this too shifts and distorts my voltage. I know there has to be a simple solution or how else could oscilloscopes measure these signals without altering their phase.
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