Found in an Electronics World of 1968, this circuit is indicated for applications in photography making the control of a camera aperture. The components are from the time.
Found in an English publication in 1969, this circuit has a 600 kHz pass band. Ferranti's...
This circuit is intended to reduce the 12V from a car outlet to 9V. The current is in the order of a...
This circuit can function as a light alarm by changing the sound when light falls on the sensor....