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I've spent the last couple of weekends working on an open-hardware power rail oscilloscope probe: connect it to a low-impedance source via a 50Ω cable/termination and it applies an adjustable offset, allowing you to view ripple on relatively high voltage rails.

Commercial probes are quite expensive (~$4k), so I've taken a first pass at a low-cost version based on an . Currently it's just a schematic, but it's been a few years since I went this deep on a low-noise design (and my maths is terrible) so I'd appreciate any early review people here can offer.

You can find the schematic and analysis at?. Feedback appreciated on-list or via GitHub issue.