I get stability more than 10 times better than in your simple scheme. Although I expected better stability. Perhaps this is due to different models of reference voltage sourcesSo you gain a little extra stability by using J1 as a constant-current source in place of a resistor and adding R2?
So the question is, how good is good enough for the TS.I get stability more than 10 times better than in your simple scheme. Although I expected better stability. Perhaps this is due to different models of reference voltage sources
show off3 parts. This is a simple as it can be. Output current changes with temperature, expect only 10% accuracy.
R1 = 39 ohms
R2 = Vee x 1000
T = 2N4401, 3904, 2222.
ak