The load of this circuit depends on the triac and the integrated circuit used is uncommon today. The circuit is from 80s documentation. The triac must have a heat sink.
This circuit is from a Popular Electronics from the 90s. The integrated circuit admits equivalents...
This very interesting project was obtained in a 1980 publication. It consists of a device that is...
This circuit beeps when the sensor is triggered by the opening of the freezer door or other...