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 uses a sensitive reed relay to control external loads. The time delay is given by the...
This small receiver for the medium wave range was found in a Japanese documentation from 1961. The...
This circuit was found in the April 1968 Radio Electronics magazine. The circuit uses two FETs...