Am 31.01.2015 06:21, schrieb Joel Setton:
I'll be happy to design a PCB, and have bare PCB prototypes made.
Sourcing parts and purchasing them will be another, larger project!
Joel Setton
Here's my design in eagle, the prototype is working fine but there is
still room for improvement:
http://dg3hda.primeintrag.org/lib/exe/fetch.php?media=rev0-econi.zip
Free for volt-nut useage, of course.
I tried to remove some voodoo that you will be told if using the
internet as source, but there are leftovers as I was afraid that they
could have something:
There are some extra cuts close to the connectors ("stress relief")
which are really unnecessary - after manufacture I became aware of a
experiment reported on EEVBlog that strong bending with a vise gave no
visible response of a LM399-based PCB on 6.5 digit DVMs.
A few drills around the LTZ itself which are cheaper to produce but
might or might not have some benefit - kovar lead and soldering joint
are thermally closer to the temperature controlled site, so less risk of
_changing_ EMF voltages there.
The opamp at the output causes some tiny little degradation but gives a
lot of protection in case of accidents and abuse.
This core circuit can be pushed around to make it much more compact, if
somebody does it the regained space should be used to add some filtering
against EMI.
The resistors are not Vishay but Rhopoint Econistors. My LTZ1000A was
sourced from ebay, and no dud.
Hendrik
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