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Variable current source with grounded load

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NARENDRA1234

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hi guys..i want to drive LED with current of 5.15mA to 10mA.now for this i need current source with grounded load.now can u please explain me the concept of grounded load?why its use?
and also i want to give 5V voltage to LED ,current through LED should be 5mA.there will be resistor with LED of 470ohms.
 

Grounded load only means the the load is connected one end to a ground ..
In this case the current source sources current from the positive pole to negative pole (ground) through a load ..

If you use current source a current limiting resistor is not required ..

See:
A Constant Current Source for a Grounded Load using a Single Op-Amp

IanP
:wink:
 

hey thnks man it was really helpful..just one doubt in the given circuit can i use Vcc as +5v for op07 opamp or LM 347..please help..i want to drive LED as load..so whether 3 V is enough for LED
 

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