Found in Motorola documentation from the 90s, this circuit makes use of a triac from that time. The circuit is for the 110 V mains but can be modified for other grid voltages.
This circuit can be implemented with discrete transistors. We found it in General Electric's 1964...
Suggested by Siliconix documentation from the 90's, this circuit uses power MOSFETs according to the...
With 3 transistors, this sensitive circuit was found in the July 1990 issue of Radio Electronics...