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input DC voltage from two to three 9 volt batteries, and get a constant current output of 0.5 mA.
I looked into current limiting diodes, the lowest current value I could find was 22mA, I need it to be 0.5mA.
the term "peak voltage" in the datasheet linked to above.
Awesome, it looks like this will do just what I want, and it is only a buck! Thanks again!