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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

Guys, how are you? Well I`m back working on the 4-20 part of my project. I`m using this reference design
http://www.analog.com/en/design-center/reference-designs/hardware-reference-design/circuits-from-the-lab/cn0314.html#rd-description
I`m using the receiver part of the reference design.

I`ve added a .1uF cap and 2.4VDC Zener diode for some protection.

What`s your thoughts on this circuit? Missing anything? Better protection ideas?

Im also using only the 0-5VDC resistors
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s1buell over 7 years ago

Guys, how are you? Well I`m back working on the 4-20 part of my project. I`m using this reference design
http://www.analog.com/en/design-center/reference-designs/hardware-reference-design/circuits-from-the-lab/cn0314.html#rd-description
I`m using the receiver part of the reference design.

I`ve added a .1uF cap and 2.4VDC Zener diode for some protection.

What`s your thoughts on this circuit? Missing anything? Better protection ideas?

Im also using only the 0-5VDC resistors
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s1buell over 7 years ago in reply to s1buell

Bump.... Anyone?
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dougw over 7 years ago in reply to s1buell

Shouldn't the protection diode be on the other side of the resistors?
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