The Triac trigger integrated circuit is not very common nowadays. The circuit was found in the Radio Electronics Experimenter magazine from 1989. The triac should be in accordance with the heater.
This circuit is from a Radio Electronics magazine from December 1958. The indicator instrument is analog...
This configuration was obtained in the SGS manual of linear integrated circuits of 1982. The...
This useful inductance bridge was found in a Radio Electronics from September 1963. The...