another one! this time, it's a super interesting bipolar current source that needs only one op-amp and one resistor!

https://schematicsforfree.com/files/Power%20Electronics/Current%20Regulation%20-%20Constant%20Current%20Circuits/Constant%20Current%20Sources/Voltage%20Controlled%20Current%20Source.pdf

I'm using one of Murata's gate drive supplies, with only 3 pF primary-secondary capacitance
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