The purpose of this circuit is to cut off the high voltage when the bias voltage fails. The circuit is from a 1975 documentation and can be adapted for other purposes.
This circuit activates a fan when the temperature exceeds a certain value, sensed by diode Q1. The...
This circuit generates sine low-frequency signals. The frequency depends on the twin-T network....
This circuit has four-time programming keys, according to the table given next to the diagram. The circuit...