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 version of oscillator with crystal using a junction FET operates in frequencies in the range...
The purpose of this circuit is to restore the 0 V black level of an analog TV video signal at the...
With this circuit it is possible to connect a low impedance microphone to the high impedance input...