Found in documentation from 1924, this receiver has several sets of coils. Power is supplied by several batteries and listening on high-impedance headphones.
This circuit was found in the 1991 Electronics Experimenter's Handbook. It activates a relay when...
Found in a 1967 Delco documentation, this circuit can deliver power from 40 to 50 W at 8-ohm load....
This article is from an old publication by A. Fanzeres. With the advent of the Nuclear Era for...