4-20 ma Loop power for resistive load

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Is there any 4-20 mA circuit avalibale that I can use for my resitive ladder? Actually want to read from resitive load which has 330 ohm resistor. It is 16 inch long and has 64 read switches and 32 resistor.
 

You can either use a 4-20 mA IC or make your own circuit comprised of a reference, OPs and an output transistor.

Do you want to make a loop powered transmitter?

- - - Updated - - -

P.S.: Yes, as said in the thread title.
 

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