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How to design a true constant current source ?

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Arsh ahmad:
I want to design a current source in which even if the load resistance goes up the current remains constant, I need an accurate load current of 200mA. The source should maintain the same current level even if the load resistance is increased.

perdrix:
What is wrong with the classic current mirror or other current sources - there's a lot of designs for this.

Just open a copy of most texts and you'll find lots.

D.

Arsh ahmad:
I need my load to be varied from 1ohms to 100 ohms but I want the same 200mA through the load. In normal current sources, the current starts to drop when I increase the resistance.

Codemonkey:
Is your supply voltage high enough ?

Arsh ahmad:
I need one to be operated at about 5 volts and one more that need to operate at about 20-40 volts.

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