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Constant current source circuit 15-50V range

Constant current source circuit (Istab ~ 4mA) shown in diagram below is a dipole type and requires very few electronic components.
Using this circuit you can build a simple electronic project that require a constant current source, using few electrical components.
Source is connected in series with the voltage source and the load.
For correct operation, the voltage applied between A and B must be in the range 15-50 V.

Circuit Diagram: 
Constant current source circuit

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