This circuit was originally suggested by General Electric in 1966 documentation to power decorative high voltage neon lamps. The transformer is 7,500 V for a current of 4 mA.
The circuit shown is from an old European publication. In it we have the way to activate a relay...
We found this circuit in a European publication from the 1990s. Transistors are still common types...
This circuit was found in an American documentation and can be added to common amplifiers of any...