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 4-20ma level converter		  New Topic  Reply to Topic
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rcopenha
New Member

USA
2 Posts
Posted - Mar 17 2009 :  08:24:40 AM  Show Profile  Reply with Quote
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![:)

pebe
Nobel Prize Winner

United Kingdom
1078 Posts
Posted - Mar 17 2009 :  09:07:15 AM  Show Profile  Reply with Quote
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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rcopenha
New Member

USA
2 Posts
Posted - Mar 17 2009 :  11:36:37 AM  Show Profile  Reply with Quote
Thanks, That is true as long as his ground are common. I was making it harder than it has to be.
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