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.
Found in Popular Electronics from the 1980s, this circuit is intended for switching filters with...
Found in American documentation from the 90s, this circuit is ideal for wearables and can be...
The circuit shown consists of a simple tester for general purpose silicon or germanium diodes and...