This two-channel bargraph meter uses a single KAA2281 integrated circuit. Found in the January 1991 issue of Radio Electronics magazine. The stereo circuit drives 2 scales of 5 LEDs.
We found this circuit in a 1975 filter cookbook. The circuit can use other operational amplifiers and...
This circuit, which can be used as a shield or in other applications, can be found elsewhere on...
Published in a February 1978 Radio Electronics magazine article, this digital circuit uses some of...