4-20 mA current source design? What circuit should I use? Help me please
Hi Amin1372,
https://easyeda.com/forum/topic/Simulation_4_20_mA_current_source-f7Dn71jOy
or are you asking;
The answers to these two questions are not the same so please clarify your requirements.
Thanks.
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Brand new interactions and interfaces.
Smooth support for design sizes of over 3W
devices or 10W pads.
More rigorous design constraints, more
standardized processes
For enterprises, more professional users.
Easy to use and quick to get started.
The process supports design scales of 300
devices or 1000 pads.
Supports simple circuit simulation.
For students, teachers, creators.
Brand new interactions and interfaces. 
Easy to use and quick to get started. 
Hi Amin1372,
https://easyeda.com/forum/topic/Simulation_4_20_mA_current_source-f7Dn71jOy
or are you asking;
The answers to these two questions are not the same so please clarify your requirements.
Thanks.