This circuit decodes a 1800 Hz tone used in communications. The circuit is from an American documentation for radio amateurs of the 80's. Equivalent component can be used.
This circuit, which has a very common configuration, was obtained in a 1994 documentation. It can...
This power control was found in a 1968 power circuit manual. The SCRs are according to the power of...
This traditional crystal radio circuit was obtained from a 1990 documentation. The diode can be...