4-20mA current generator circuit

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udhay_cit

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I'm using a 4-20mA current generator circuit which is taken from the internet search.

The circuit is working fine for the following specifications

4mA output for 0.2V
20mA output for 2.0V

Now i need to modify the circuit component value to get the output of
4mA for 0.4V
20mA for 2.0V

i don't know how to change components value to get the required output. Please help me regarding this...

Thanks & Regards
Udhay
 

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This circuit should give (regarding resistor values) 0mA at 0V and 20mA at 4,47V. You don't get 0mA, because LT1001 is not single supply Opamp. To get 20mA at 2V, just change combined resistance of R7, R8, R9, R11 to 100Ohm.
 

The circuit is working fine for the following specifications

4mA output for 0.2V
20mA output for 2.0V
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That's not true. The circuit is simply cutting lower input voltages because LT1001 isn't suitable for single supply operation. Just use a different OP.
 

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