Found in documentation from 1924, this receiver has several sets of coils. Power is supplied by several batteries and listening on high-impedance headphones.
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...