This static switch circuit or solid-state contactor was found in a Motorola documentation from 1968. The circuit can control a 5 A load with the indicated transistor.
In the figure we have a classic Clapp oscillator configuration for a frequency of a few tens of...
The circuit was found in the February 1992 Radio Electronics magazine. The scale can be changed by...
Found in a 1968 Ferranti documentation, this circuit can be implemented with modern equivalent...