This circuit was found in an ancient American documentation. The power supply is not given, but we have the voltages used. The relay is sensitive type for high voltage.
In the figure we have a security system consisting of a sophisticated alarm found in a 90s edition...
The purpose of this circuit found in an American 1980s documentation is to produce a current pulse to...
The transistor used in this circuit is uncommon today. AC124 or equivalent such as AC188K and...