an extremely simple AM radio receiver with little more than a tuned circuit and a point contact diode as its components. Point contact diodes have become difficult to find but can be replaced with ...

His device had only a two-circuit system, which some said could ... Tesla filed his own basic radio patent applications in 1897. They were granted in 1900. Marconi's first patent application ...

In its basic form, the circuit calls for a power supply ... it became a powerful radio transmitter. In fact, in the early decades of radio, most practicable radios utilized Tesla coils in their ...