This circuit, which can be used as a shield, was found in American documentation from the 1970s. This configuration appears elsewhere in this section from other sources.
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...