Recommended · for some experience
EEVblog #579 - Precision Low Current Source
Why people recommend it
Dave Jones works through designing a constant current source, offered as inspiration and possible help for anyone building their own.
Watch for: leakage and guarding matter at very low currents
In their words
"EEVblog #579 - Precision Low Current Source" (not Howland pump, but interesting)
Alexandre Kandalintsev on electronics.stackexchange.com, Jul 2016. CC BY-SA.
I think Dave's EEVBlog Video on designing low precision constant current source may help someone.
Unknown123 on electronics.stackexchange.com, Mar 2019. CC BY-SA.
