https://github.com/pepaslabs/dr-frank-ltz1000
https://github.com/pepaslabs/px-ref
Awesome, looks like two solid designs. Not sure yet which one I want.
I don't mind 7V or 10V, I think it does not make a big difference.
I would say, instead, that I would rather do whatever circuit performs the best.
I hope you have already ordered the necessary precision resistors.
Otherwise you might have to wait another 6-14 weeks.
Yes, thankfully, there was a
group order a few months back and I got 120, 1K, 12.5K, 2x70K. I regret (a lot) not getting more than one set, but heh, better than nothing and enough for one reference with typical circuits. They are not the famous VHP100 series, but should still perform well.
The stability of those references also depends on mechanical design (air drafts)
and EMI disturbances (mobiles / LED lamps) in your environment.
I plan to just put the damn thing into a block of foam. Brute force method
Which design to choose is mainly dependant on your personal preferences.
- dual supply / single / battery powered supply
- 7V / 10V output
- your environment conditions
What I would like is to get something like a Fluke 732A in terms of features. I would love to have something that can be AC powered, but also run on battery for up to a few days so I can move it around freely or even ship it (cal club heh?) and not worry about power outages.
Thank you so much Andreas for the valuable feedback. Helped me make progress in my thoughts about what I will build. Still not sure yet, I need to continue digging in the rabbit hole.
There is also the simplified LTZ reference circuit based on W/F7000 available,that only needs one "better" resistor and is otherwise using resistor networks, no need to spend gold on expensive components with long lead-times.
-branadic-
This one?
https://xdevs.com/article/b7000/Interesting design - it seems like it does require quite a bit more initial trimming than the other designs, but that allows for reduced TC with lower cost components.
Aaarg another design to consider building
Would be interesting to build one of the standard design, and one of this design to compare them. But sadly, with a sample size of only one LTZ per design type, I think I would be comparing the actual LTZs and not the designs.