This two-tone decoder has a bandwidth of 24%. The circuit is from a 1994 Electronics Now. The components without the value determine the recognized frequency.
This circuit measures the power of a transmitter being sandwiched between the antenna output and the...
This alarm circuit was found in the July 1992 Radio Electronics magazine. The circuit uses a small...
This circuit was suggested by General Electric in 1970 documentation. It makes use of a photo-SCR...