This sensitive motion sensor with inductive sensor was found in a 90s Elektor. The circuit uses only transistors to activate a buzzer.
This circuit was found in the November 1992 issue of Radio Electronics magazine. It uses...
This 80's circuitry decodes stereo signals used in analog TV at the time. The circuit can be used...
This configuration often addressed on this site is from a 2000 documentation. The circuit can be...