He’s trying to visualize what’s going on with the current draw of a microcontroller at various points in its operation. He figures 5 mA at 2.5 mV is in the ballpark of what he’s probing.

We don’t know if it was cost or principle that motivated [Electronoobs] to build his own current clamp, but he did. This probe design is little more than a 3D printed case, an old power supply ...

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