This circuit interrupts the power supply when grounding is missing. The circuit is from an old documentation (from the 80's) using current transformers and other components of the time.
With this circuit it is possible to use a pair of old telephones in a wired communication system. The...
This is one of the first circuits published on this component. We found it in the September 1950...
This conventional source with transistors was found in a 1989 documentation. The transistors must...