We found this circuit in the October 1987 Radio Electronics magazine. The circuit uses a 1-to-1 turns ratio pulse transformer to trigger the Triac.
This configuration can be found in other articles on this site. This is from European...
Using an LDR as a sensor, this circuit is from the Radio Electronics magazine of December 1984. The...
This circuit was found in the August 1994 issue of Electronics Now magazine. The 4046 is uncommon...