Hi Friends ! I am sorry for don't update i post because i am busy few days. OK to day share with you Simple Bilateral Current Source Circuit Diagram This circuit uses a CA3193 precision op amp to deliver a current independent of variations in RL.
With RI set equal to R3, and R2 approximately equal to R4 + R5, the output current, h. is: VlN (R4)/(R3) (R5). 500-I`A load current is constant for load values from 0 to 3ohm.