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 circuit is from an Electronics World of 1968. The transistors are of the time and the power...
This circuit can be used in the car to convert the 12 V from the battery in 6 or 9 V up to 2 A....
This circuit, from the ON Semiconductor Thyristor Manual, controls both the speed and direction of...