Found in a Popular Electronics this circuit has double regulation. The integrated circuits used provide a maximum current of 1 A and must be provided with heat sinks.
Found in a 1967 manual, this circuit uses transistors from the era to generate a linear ramp...
This 1992 circuit uses a common LM139 comparator today, but it can be built with equivalent...
The circuit shown is a constant current source which allows the reading of resistors on a very low...