This circuit is from a 1924 book by Gernsback. The receiver uses two tubes and listens to headphones. Power is supplied by battery with the indicated voltages.
Found in an American 1980s documentation, this circuit generates high-intensity pulses for a...
This powerful FM transmitter was found in a 2002 documentation. The output transistors must be...
This circuit was obtained from a 1966 documentation. The transistors are of the time. The circuit...