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.
This 4-function, high-pass, low-pass, band-pass and rejector filter was found in French...
Found in an Electronics Now from the 1980s, this circuit uses some components that are still...
The first configuration we show is a flip-flop that can be triggered using two push buttons of the...