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 1-transistor oscillator circuit was found in the March 1965 Radio Electronics magazine. The...
This circuit can be used as a shield for microcontrollers. The relay is power compliant, and the...
This circuit was found in the SGS manual of linear integrated circuits of 1982. The CMRR depends on...