current to Voltage conversion

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sagtale

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How to convert 420mA current to 0-5V conversion..
 

One way: put your 4-20 ma through a 312.5 resistor-->1.25-6.25V. Then add a circuit to subtract 1.25 V.
 

I assume you mean 4 to 20mA ?

If so you can just add a resistor to gnd:
volts/amps = ohms = 5/0.02 = 250

so use a 250 ohm resistor which will give and output of 0 to 20mA = 0 to 5V
(1V will equal 4mA)

If you really need 4 to 20mA at 0 to 5V, then you can either do it in hardware with an op-amp and some offset.
or if you are reading the volts via a micro ADC then just scale in software.

Regards
Chris
 

Is this current AC or DC ?
There are many ways to do it, you want complex way or just an easy one ?
You want quality on the converter?
 

that is DC current..
 

Hi,

I have attached the schematic.

Regards,
Viswanath
 

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  • 4-20ma to 0-5V Conversion.pdf
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