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 inverse transistor breakdown circuit was found in a 1967 documentation. It applies to modern...
This old amplifier, with germanium transistors, was found in a Japanese technical magazine in...
With this type of circuit, it is possible to obtain high input impedances and, at the same time,...