This circuit was found in the January 1991 issue of Radio Electronics magazine. The circuit uses integrated circuits of the time and the coils depend on the tuned bands.
This circuit was found in an American technical manual from the 1980s. The LM111 is an uncommon...
This sensitive circuit was found in old documentation. The SCR can be any of the 106 series and...
This circuit is based on documentation from the operational's own manufacturer, from the 80's. The same...