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 a 90s Popular Electronics, this simple circuit turns on a light when the light stops to...
This circuit was published in an English magazine from 1980. The magazine no longer exists, but...
This simple circuit makes use of neon lamps to indicate the voltage of a power grid. The lamps are...