This amplifier with old germanium transistors is from a 1957 documentation. The power is a few hundred milliwatts and the transformers are common types of driver and output of the time.
This circuit was obtained in an old American documentation, remembering that the 566 is the double...
The purpose of this circuit found in a 1990 documentation is to control two incandescent lamps or...
This oscillator that excites 3 LEDs sequentially is also called a circle oscillator. The frequency...