Electronics > Projects, Designs, and Technical Stuff

Current Reference IC for V & C Reference Standard Box

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t1d:

--- Quote from: Vgkid on April 03, 2020, 08:30:13 pm ---Try this link, its in chinese.
http://bbs.38hot.net/forum.php?mod=viewthread&tid=17593&extra=page=9&mobile=2

--- End quote ---
Nope, still a vendor ad for cell phones... Look at the link address = "38hot." That's the name of the vendor site. What should I be seeing?

oPossum:
Fixed link: http://bbs.38hot.net/forum.php?mod=viewthread&tid=17593

beanflying:
Good link to that Chinese site. Google translate does an ok job  :-+

And just because Bob Pease is always worth a watch. Off to rummage around in my other PC....

t1d:
That's an amazing link. Thank you.

I will watch the video. Later today, I hope. Thanks for it.

David Hess:

--- Quote from: t1d on April 03, 2020, 01:09:15 pm ---
--- Quote from: David Hess on March 31, 2020, 02:18:19 pm ---Current references usually rely on the voltage reference and a precision resistor.
--- End quote ---

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?
--- End quote ---

Digital pots tend to have poor absolute accuracy and are intended to be used as dividers.

A switched capacitor circuit can generate a precision variable current from a voltage within the limits of the accuracy of the capacitor but fixed resistors will be more accurate and easier to use.

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