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 gain of this circuit is given by the value of R1 that depends on the current in the...
The circuit presented uses Linear Technology Operationals, having been found in a 1993 manual. The...
The light effect obtained with the circuit shown in figure 6 is different from the others: it...