Precision current sink

  
The 2N5457 JFET and PN2222 bipolar have inherently high output impedance. Using Rl as a current sensing resistor to provide feedback to the LM101 op amp provides a large amount of loop gain for negative feedback to enhance the true current sink nature of this circuit
Precision current sink - schematic

For small current values, the 10K resistor and PN2222 may be eliminated if the source of the JFET is connected to Rl.




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