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Precision current sink circuit

April 2, 2012 by

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.[...]
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