Author Topic: Create a basic circuit need help  (Read 1297 times)

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Offline montenegrin_touristTopic starter

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Create a basic circuit need help
« on: October 31, 2017, 06:01:35 pm »


Hello dear friends I need help. My task is to create a circuit that transforms input current from 4 to 20 mA to 0-5V voltage at the outside. I should use OPs, resistors or CFBs. Please help exam tomorrow yes  :-\
 

Offline rstofer

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Re: Create a basic circuit need help
« Reply #1 on: October 31, 2017, 07:40:51 pm »
Did you try to Google for '4-20ma to 0-5v converter circuit'.  I did and got over 3 million replies.  Basically, it takes 2 op amps and a hand full of resistors.

https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQrpgUwL--_ir1XlCzCIzLoyvbQM5LYvVuUinPSX2qf9XHU5tJu
 

Offline Kire Pûdsje

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Re: Create a basic circuit need help
« Reply #2 on: October 31, 2017, 09:04:47 pm »
If a burden voltage is allowed, either just use a resistor to convert current to voltage and use a summing amplifier with an offset voltage.
Since this is an exam question, I think the concept is purely theoretical and a burden voltage is not allowed.
I guess you have been taught all the basic nullor circuits. Just use the concept for a transimpedance amplifier, either with an offset current at the input, or compensated for the offset at the output.

Edit, if you are really looking for the bare minimum, (which is not the intention, I think) a single voltage supply with a single resistor is sufficient
« Last Edit: October 31, 2017, 09:08:26 pm by Kire Pûdsje »
 

Offline ebclr

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Re: Create a basic circuit need help
« Reply #3 on: November 03, 2017, 05:14:16 am »
If your device is the unique device on the loop a simple 250 ohms resistor will do the job to 1 a 5 V converter ( you can remove the 1V on software on the other side )
« Last Edit: November 03, 2017, 05:16:02 am by ebclr »
 


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