This circuit was suggested by Motorola in a 1980s publication. It is based on a PUT that is not a common component today. The division depends on the capacitor values according to the table.
I found this simple circuit from an English magazine from 1984. The circuit can be easily...
Information about the high voltage transformer and the detecting circuits was not given in this...
The purpose of this circuit is to supply a direct reference voltage from the power grid. The...