This circuit was obtained in a 1967’s EEE. Transistors and integrated circuits can be replaced by modern equivalents. The FET is for general use.
This xenon lamp circuit is from old documentation. The trip transformer has a 1: 1 turn ratio and...
This simple alarm with integrated CMOS sounds a piezoelectric transducer when the sensor circuit...
In the figure we have an interesting circuit for those with a project that requires a sub-multiple...