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Zener plus the NPN Vbe gives a "fairly flat" TC sum

(if you pick the right bias current, not too much

Rs*Ibias in the mix). Better curvature than a

bandgap (which you wouldn't really want to do

with discretes anyhow).


Know that "stack voltage" and your resistor

divider values can be figured for whatever

voltage output you like (as long as it's above

Vz+Vbe).


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