Combination Voltage And Current Regulator Circuit

  
This voltage-regulator/cuiTent-liimter combination can be made from two 7805 regulators as shown. Rl, R2, and R3 shouldbe selected for a 5-V drop at the maximum allowable currant limit. SI selects one of the three current values. Do not forget that Ul requires 5 mA to operate and this means that the minimum current limit setting should be 10 mA or more (Rl - 1.25 kQ).
Combination Voltage And Current Regulator Circuit - schematic

Resistor values are as shown.




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