This very low current circuit was found in the April 1995 Electronics Now magazine. The frequency should be chosen for maximum efficiency according to the small transformer used.
This trigger uses two switching transistors that can still be found with some ease. The circuit is from...
This circuit was obtained in old documentation, but it is valid for modern triacs that must be...
This circuit was found in a Japanese magazine from 1971. The circuit uses Japanese transistors of the time,...