Found in an 80's Hands On Electronics, this circuit turns on a light when it gets dark and goes out when it gets dark. The circuit can be adapted to use high-brightness white LEDs.
This integrated generates all the higher octave frequencies of a common keyboard when a clock...
In the figure we have the way to make the three-phase control of a motor using opto-diacs. The circuit is...
This experimental short-range transmitter came out in a 1972 publication and was designed to...