The circuit is from a June 1995 Electronics Now. The relay is power-dependent and both R1 and R2 should have close resistances in operation.
This circuit was found in the October 1994 issue of Electronics Now magazine. The 40446 IC is a...
This car alarm was found in an American '80s documentation. The circuit automatically activates...
This circuit was obtained in an old Elektor. It is a reference, since the integrated products of the...