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 configuration has already been given in several articles and circuits on this website and...
This circuit is from a Harris Semiconductor datasheet from the 80s. However the circuit can be...
We found this logic level tester in a 1976 documentation. The circuit is powered by the voltage of the...