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.
Found in a 90's EDN, this xenon pulsator uses a Sidac. We already used this setting in an article...
We found this circuit for different frequencies in an American documentation from the 60's. The...
This bargraph circuit using LM3914 was found in the October 1980 Radio Electronics magazine. Note...