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.
Found in a 1967 American publication, this circuit with feedback for two transistors has a gain of...
This circuit was found in the Spanish magazine No longer in existence, Mundo Electrónico, in a...
This circuit uses transistors from the time it was published but can be mounted with current...