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Precision current sink circuit (PN2222)

2017-07-19 14:22  
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This article describes the Precision current sink circuit (PN2222). The principle is very simple, very practical. The circuit components can help you understand better grasp this principle. For example, in this circuit, you can go to find and buy these components:PN2222.

This is acurrent sink circuitthat 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 theLM101op-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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