@▷ Precision current sink circuit | Diagram for Schematic

Precision current sink circuit

This is a current sink circuit that uses a transistor, Jfet and LM101 IC op-amp, so there are high precision.
The 2N5457 Jfet and PN2222 bipolar have normally high output impedance.
The R1 is used as a current sensing resistor, for provide feedback to the LM101 op-amp that it supply a large amount of loop gain for negative feedback, to enhance the real current sink nature.
The value of Iout is : Vin/R1 , by Vin more than 0V.
For low current values, the 10K resistor and PN2222 may be clear out, if the source of the Jfet is connected to R1.

Precision current sink circuit

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