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.
Author: Newton C. Braga Published:July 5, 2016 Formato:Book and e-Book Pages:...
This circuit can be used in alarms by activating a relay or a current load that depends on the...
This circuit for the 1.5 to 15 V scaled ranges was found in a 1982 documentation, but uses current...