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 4-20ma level converter

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rcopenha Posted - Mar 17 2009 : 08:24:40 AM
A friend of mine asked if i could help with a project. He is using a Basic Stamp that the system voltage is 5 Vdc. He is wanting to use a a Analog 24 Vdc 4 -20 ma level sensor on one of the analog inputs. Has anyone had sucess building something like this? I have tried a few things with some op-amp circuits but the problem I keep running into is oscolation in the circuit. Any suggestions? Much thanks![:)
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rcopenha Posted - Mar 17 2009 : 11:36:37 AM
Thanks, That is true as long as his ground are common. I was making it harder than it has to be.
pebe Posted - Mar 17 2009 : 09:07:15 AM
Put a 150ohm resistor in the current loop and measure the voltage across it.
You will get 0.6 V to 3V to feed into the A/D

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