This shield with full-wave triggering was found in the Radio Electronics Experimenter magazine of 1989. The Triac must be according to the load that must be controlled.
This circuit, from a 1999 publication, uses an improvised optical coupler with LED or...
This reducer was found in documentation from the 1980s, using transistors of the time. The higher...
This circuit was obtained in a 1991 Electronics Handbook. The publication no longer exists, but...