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.
With the circuit shown in the figure, it is possible to connect or disconnect a load controlled by the...
This immobilizer circuit for the car was found in the Radio Electronics magazine of December 1976....
This fast converter using operational was found in a 70s American documentation. The circuit can be...