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Constant Current Source Adjustable Down to 0 mA

The simplest way to make an adjustable constant current source is to use a voltage regulator in a suitable configuration: an example of what is needed is given in the LM317 datasheet. However, this design does not allow the current to be adjusted down to zero. The design given here gets around that limitation.
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Correction

Issued: June 28, 2011.

Transistor T1 should be labelled: BC557B.

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