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What is a simple and effective way to make an Adjustable Constant Current Source?
https://www.ti.com/lit/ds/symlink/tl064m.pdf
In my eyes the LM334 is more a temperature dependent current source than a constant current source.You could use a pair of LM334 adjustable current sources.
How accurate will the results be?
With 5V supply, you still need an OP with output voltage range down to negative rail and common mode range down to 0.6V. TL062 doesn't work for this application, cheap LM358 e.g. would (but needs 5V supply to reach 3.3V).
Hi,
you are using an ADC, so you process the data somehow, maybe with a microcontroller.
Then i recoomend to use an input range with some headromm in both sides.
Maybe 0..24mA. Then 4..20mA is well within. No need to find the exact resistors. Software will adjust..
Klaus
Thanks.good idea. But wouldn't a buffer stage after the 165R resistor still be necessary?
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