Electronics > Beginners

4-20ma current source

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Beepboop:
How does the process meter in Dave's video generate the 4-20ma current? As it does not seem to have an voltage to current chip or a dac that outputs current. https://youtu.be/y3h02BDPMJw

ebastler:
A current source can be as simple as this:


https://en.wikipedia.org/wiki/Current_source

No idea what circuit that meter uses, though.

timmy88:
I can't open your youtube link for some reason |O |O |O

ogden:

--- Quote from: timmy88 on February 10, 2020, 12:25:42 pm ---I can't open your youtube link for some reason |O |O |O

--- End quote ---
It's EEVblog #1248

Beepboop:
Im more looking for an answer to how it adjusts the current and does it precisely.

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