Electronics > Projects, Designs, and Technical Stuff
Current Reference IC for V & C Reference Standard Box
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t1d:

--- Quote from: beanflying on April 02, 2020, 10:23:20 am ---I built a pair of 6350 VRefs as my first ones (3S LiPo powered) and they have held up well against their initial accuracy over the last few years. They did settle a few PPM during the first few hundred hours so give them a good run. https://www.eevblog.com/forum/metrology/5v-precision-voltage-reference/msg1367777/#msg1367777
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Nice project and photos.

--- Quote from: beanflying on April 02, 2020, 10:23:20 am ---There was also an App note  (currently lost  :palm: ) using a Darlington 2N6286G (sitting in the project list/box  ::) )as a current source. I have a feeling it was in an earlier datasheet for the LM399 Vref and was good for 10A. If it turns up I will add it here.

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If you find it, please do post it.

Not to get too far off track on a voltage reference, but I made a tiny PCB for my MAX6350... Think postage stamp... I socketed the 6350, so I can move it into the combination V & C Reference unit.
beanflying:
Will do on the Current Source I think it is on and old PC now attached to my Laser so I will have a search. I really should have done PCB's for my 6350's but KISS in the Ozzie bush works for this level of VRef. Make sure you have a read through Andreas comments too in that thread but bear in mind he is chasing sub PPM Voltnuttery for 'fun' ;)
t1d:
Here is a link about my VRef board. Updated to include the KiCad files, by email, and a free board, if I have an extra.
https://www.eevblog.com/forum/testgear/questions-about-the-use-of-my-new-max6350-precision-voltage-reference-circuit/msg2995338/#msg2995338
t1d:

--- Quote from: David Hess on March 31, 2020, 02:18:19 pm ---Current references usually rely on the voltage reference and a precision resistor.

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I have been looking at this, a bit. It certainly is easy and direct.

I wonder about using a digital pot. I understand that it would only adjust in bracketed steps, which would limit achieving accuracy between the steps. However, if there are a lot of steps, it seems to me that a digital setting would be as good as you could dial in with a trimmer, by hand. Thoughts?
Vgkid:
Try this link, its in chinese.
http://bbs.38hot.net/forum.php?mod=viewthread&tid=17593&extra=page=9&mobile=2
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