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.
The simplest flip-flop can be built with two NAND gates as shown here. This is a Reset-Set [S-R]...
This circuit is suggested by RCA and is based on a dedicated integrated circuit that is the...
June 2017 - Vishay Siliconix's new Generation IV (Gen IV) Channel N MOSFETs can now be purchased...