This anti-theft circuit was found in a 1985 documentation. It uses common components that can still be found easily. The relay is 12 V and the circuit has timings of 3 minutes and 20 seconds.
The circuit presented with low drift is from the Motrorola LinearDatabook of 1990. The circuit...
This strobe light circuit for car spot adjustment dates to 1987, when there were no electronic resources...
An interesting solution that can be provided in some cases is the one shown in the figure in which...