This should be a walk in the park for most, but I am having a major issue with building a high-precision constant current source.
Right now I am using a LM313 and a JFET in a modified Howland topology. Output needed is 100uA. Problem is, the LM313 is very sensitive to temperature changes and my accuracy is swinging over +/-5%.
Let me change adjectives... I now need and ULTRA-precision current source. Thoughts?
Also, it would be useful if I could just buy a current source circuit and implement it on an existing PCB.
Latch
