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 circuit was found in documentation from 1977. It consists of a bridge of capacitances using a 50...
We found this circuit in a Gernsback documentation from 1960. The circuit is intended for...
The frequency of this traditional crystal oscillator (XTAL) depends only on the used crystal,...