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.
The purpose of this circuit is to automatically turn a water pump on and off. Sensor 1 is the...
This circuit was found in Motorola's 1967 documentation. The circuit makes use of power...
This interesting circuit appeared in the April 1952 Radio Electronics magazine. The circuit is...