This UHV generator circuit or ultra-high voltage was found in a 90s Electronic Engineering 90s. The triac can be of any type and the voltage depends only on the transformer.
This circuit was suggested by National Semiconductor in its 1994 Linear Applications Handbook. The...
This circuit with germanium transistors is from 1960 and was found in Mullard's transistor...
This transistor source can supply currents up to 2 A and the voltage determined by the zener...