HV low-frequency differential oscilloscope probe

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I saw this homemade 100X differential probe on you tube. The circuit uses opamps with unity gain placed after a resistor divider network. Looks interesting. It has a more than sufficient bandwidth of 800Khz. Good enough for PI. Maybe a differential probe is not required and just a regular 100X single ended probe is sufficient. But it is still good to know.

https://www.google.com/url?sa=t&rct=...w9Gt90bmtKD9vO