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 circuit is recommended for alarm systems since it has a good output stage. The circuit is...
) Suggested by Philips in a 1968 documentation this circuit has very high 10 ohm on-load voltage...
No information is given about the transformers in this circuit suggested by Motorola in a 1968...