Is this particular form of a cc circuit vulnerable to the cc value being varied by thermal rise?
Op amp is lm358 please disregard the pot, its bound to have variation with thermals, Im more concerned about the opamp and fet varying current due to thermals.
I noted the high value "shunt" is there because lower values such as 20R demand ~8mV with 25v supply. I suppose I can use lower voltages using a zener across the pot and cause it to accept ~20mV for 1mA but this is till quite low. Is the millivolt reference severely susceptible to noise thus distorting the constant current regulation?