This circuit is from a 1980s Motorola documentation. The circuit can be made with modern equivalent components. The original circuit is for the 115 Vac (110 V) grid and has two settings.
For reference only, this is the second IF amplifier stage of a common transistor radio from the...
Using the Linear Technologies LT3080 IC we have a constant current source with a 10 V voltage...
This circuit is from a 2005 Linear Technology publication. It converts current into load sensing...