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.
We found this circuit in November 1983 Radio Electronics magazine. The circuit drives an LED and...
This 90's Electronic Design circuit converts the period of a signal into a frequency. The...
This “compandor” circuit has the opposite effect of CB15195E. The LS150 is not common today and...