This circuit controls a heating element using a triac. Triac must be fitted with a heat sink. We find it in an American documentation from the 80s.
This timer for time intervals of up to a few minutes was found in an English publication in 1965....
This circuit generates 5 different tones selectable by switch S1. Separate pressure switches can...
This circuit can be used as an input shield for microcontrollers or other TTL circuits. The power...