This grounding test circuit was found in an American 80's documentation. The circuit is for the 110 V power grid but can be changed to the 220 V power grid.
This circuit was obtained in a 1991 Electronics Handbook. The publication no longer exists, but...
The frequency of this Pierce oscillator, found in 1969 documentation, depends on the crystal. The...
Maxim MAX20416 Step Down Converters Available through Mouser Electronics these 2.2 MHz converters feature...