This midrange filter for sound systems was found in the May 1988 issue of Radio Electronics magazine. The circuit is based on a dual amplifier that must be powered by a symmetrical source.
Indicated for powering circuits with operational amplifiers, this source was found in Popular...
This two-tone decoder has a bandwidth of 24%. The circuit is from a 1994 Electronics Now. The...
This circuit was obtained in the manual of the used integrated circuit. Equivalents may be used...