This adjustable circuit from 0 to 200 nA was found in a 90's EDN. The components can still be found relatively easily, as they are CMOS.
For trigger high power loads connected to the power grid, nothing better than using a TRIAC. For...
Fully-Certified Software Development Kit Leverages Hardware-Based Calculations to Create Fast,...
This circuit is from an old manual of operational amplifiers. The setting can be adapted to work...