I decided it would be fun to see how stable I could make a zener voltage reference. I have no actual needs though so I'm not going to spend a ton of money on it (famous last words for every project I've ever done). I figure I'll keep it at work as a really boring desk-toy and occasionally measure it when I have the nice meter out.
I think a 1n4571 fits the bill of only 5$ and fairly good but I see the 1n4574 the same "typical" characteristics but worse, worst case. It's also 20$. Are these the same just binned around the specified current? Can I tweak the diode current up and down while adjusting the temperature to find the TC=0 point and just set it there? Also they come in a -1 option with an "internal metallurgical bond". Is that good? Do I want that?
Are there other diode options that are better drift and Tc per dollar?