This circuit was found in the June 1991 issue of Radio Electronics magazine. The circuit uses two Hall effect sensors of the time. It can be assembled using modern equivalents.
This simple low power stage with output transformer was found in an American documentation. The transistor...
July 13, 2015 - Mouser Electronics, Inc. today announced that it has signed a global distribution...
This touch switch appears elsewhere on this site from various documentation. This is from an 80's...