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Circuit Review

s1buell over 7 years ago

I`m currently making some proto circuits and I would love some feed back/Ideas etc.

All these circuits will connect to Arduino or Arduino compatible devices.

Anyone have time to help out with some reviews?

First circuit is a 4-20ma board

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genebren over 7 years ago in reply to s1buell +4

You might need to modify your 4-20ma loop front end somewhat. First, the circuit as shown does not have a return path for the current loops. Also, the current loop may not necessarily be directly referenced…
genebren over 7 years ago in reply to s1buell +4

Tom, Again, I am not sure that you can count on the second leg of the 4-20ma loop to be at ground potential. You might end up shorting out a driver or introducing ground noise into the circuit. Here is…
genebren over 7 years ago in reply to s1buell +4

Tom, Here is an even better link. This shows how to differential sense the loop current. https://www.sensorsmag.com/components/implementing-a-4-ma-to-20-ma-sensor-interface Good luck! Gene

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s1buell over 7 years ago

Wow missed that one. Completing the loop would be nice....
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genebren over 7 years ago in reply to s1buell

Tom,

Here is an even better link. This shows how to differential sense the loop current.

https://www.sensorsmag.com/components/implementing-a-4-ma-to-20-ma-sensor-interface

Good luck!
Gene
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abrain over 7 years ago in reply to genebren

Another useful source I found was instrumentation amplifier data sheets - the AMP04 from Analog Devices has a suggested 4-20mA receiver circuit that also shows some TVS protection diodes being used to protect the inputs, which could be useful in an industrial application?

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abrain over 7 years ago in reply to genebren

Another useful source I found was instrumentation amplifier data sheets - the AMP04 from Analog Devices has a suggested 4-20mA receiver circuit that also shows some TVS protection diodes being used to protect the inputs, which could be useful in an industrial application?

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