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 amplifier is from a 1973’s Japanese magazine. The transistors are of the time and the power...
This original 70s RCA circuit appears elsewhere on this site, including original RCA...
May 2017 - Mouser Electronics announces the availability of new Toshiba SSM6K N Channel MOSFETs...