This circuit was found in a 1964 documentation. It shows how to achieve automatic gain control for an oscillator. The transistors are of the time and the circuit controls signals from 2.6 to 3.1 kHz.
An interesting interface solution that can be provided in some cases is the one shown in the...
This circuit was suggested by Signetics in documentation from the 90s. The circuit uses components...
This dimmer for the 120 V (117 V) network was found in the magazine Electronics Now of August...