[volt-nuts] 3458A reference boards on ebay

[Todd Micallef]

Hendrik,

Thanks for sharing your design. I have looked at the Rhopointasia.com
website and I noticed they had the squaristors. They appear to be of a
similar size to the Vishay metal foil resistors. It would appear you might
save some space on your design using radial packages. I have not seen these
mentioned by other users and I would be interested to see some real-world
data.

Todd

On Sat, Jan 31, 2015 at 2:59 AM, Hendrik Dietrich <don_hendi at gmx.de> wrote:

>
> 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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