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.
This receiver for medium wave range with germanium transistor was found in a documentation from...
April 2017 - Already obtained at Mouser Electronicsthe new Molex miniDImm sockets according to...
We found this circuit in an Electronic Design from the 80's. The generated tone can be changed as well...