Variable HVDC supply using Fly back transformer with several protective features to the output power BJT/ MOSFET

We can produce Variable HVDC with a little arrangement using Fly back Transformer (FBT), Tesla coil, car ignition coil & other type of auto transformer found in microwave oven, X-ray units & in similar devices which is very reliable & light weight. In our experiment we made such a power supply & try to give it several protective features to its output power BJT/ MOSFET to increase the longevity of the power supply. As far as the general run of small-scale electronics is concerned, EHT supplies are used mainly for cathode ray tube (CRT) anodes and for some specialized purposes such as Geiger-Muller counters and photomultipliers. None of these applications calls for a large current drain. As an example, X-ray equipment may require 100 kVDC at a current of less than 1 A.