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

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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