This circuit was found in a 1970 American publication. The FETs are power types according to the desired output current. The operational can be replaced for modern equivalents.
January 2017 - Texas Instruments' new TPS54200 integrated circuit for excitation of LEDs with a...
April 2017 - Mouser Electronics is making available this new component for open LED protection...
Using the Linear Technologies LT3080 IC we have a constant current source with a 10 V voltage...