A project that has open 50kV contacts and 240VAC inputs is not a good idea for someone with little electrical design experience.

There are plenty of example circuits online, but I would not recommend for a first project. Ozone generators are cheap, I would go that route and do something low voltage/not cheaply purchased for a first project.

Please note that 50kV circuits are absolutely lethal and under no circumstances will EasyEDA be responsible for the safety of anyone attempting to build such equipment.

You must also be aware of the dangers of ozone generators:

https://www.nachi.org/ozone-generator-hazards.htm

https://molekule.science/ozone-generators/

At 50kV you will not be building that on a PCB.

Unless you are working with very high power radio frequencies I'm not sure you actually mean a voltage amplifier.

Do you mean a voltage multiplier?

If so then you need to be talking to accredited high voltage consultancies about the kind of circuits that used to be used for cathode ray tube (CRT) colour tv final anode EHT supplies.

Or maybe Cockroft and Walton voltage multipliers:

https://en.m.wikipedia.org/wiki/Cockcroft–Walton_generator

https://en.m.wikipedia.org/wiki/Voltage_multiplier

As a civil engineer you should not be attempting to build any such equipment.

@andyfierman
thank you andy
your answer was so helpful
i'm be careful
i found a high voltage multiplier on the internet and made a simple circuit as picture
but it sparked only and it's not stable
i used twenty 230nF film 400v capacitors and IN4007 diods

can you help me to have a stable voltage

What is your suggestion for using one or more parallel capacitors between voltage output pins?

@cjohnson
thanks for reply

@andyfierman

I mean for using a parallel capacitor in a schematic circuit between voltage output pins to have a stable high voltage

what hapend if i use twenty 1nf 400 v capasitores
Will the circuit be charged and discharged faster
Does reducing the capacity of the capacitors help to have a stable power supply?

@msh1353,

If you wish to experiment with voltage multipliers then the only safe way to do it is by using simulation.

You can do that in EasyEDA but I am not prepared to advise on real circuit implementations for the reasons already explained.

To learn about schematic capture and simulation in EasyEDA please start by reading:

https://easyeda.com/forum/topic/How-to-ask-for-help-and-get-an-answer-71b17a40d15442349eaecbfae083e46a

@andyfierman
okay that's helpfull and i got it