*This project is still going through a revision, to improve BW*
This widget is a versatile and configurable 10MHZ (hopefully soon 20MHz) current sense amplifier; powered by 3 TI OPA810s in an instrumentation amplifier configuration. The CSA can be used for either low side or high side current measurement due to high common mode rejection ratio of the circuit.
The widget is powered by a 9V battery, which allows the output to swing ±4.5V maximum since the opamps are rail to rail. The circuit works as low as 4.75V at which point the battery low indicator will illuminate. A power switch is included to completely disconnect the battery.