This simple sensitive circuit was suggested in a July 1992 Radio Electronics issue. The relay is a double-contact changeover relay. Sensitivity adjustment is made at R2.
June 2017 - In its huge line of available components, Mouser Electronics highlights the new...
The circuit below was found in the March 1990 issue of Radio Electronics magazine. The circuit...
This transistorized astable for LEDs was found in the January 1992 issue of Radio Electronics...