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://www.nachi.org/ozone-generator-hazards.htm) [https://molekule.science/ozone-generators/](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/Cockcroft%E2%80%93Walton_generator) [https://en.m.wikipedia.org/wiki/Voltage_multiplier](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](https://easyeda.com/forum/topic/How-to-ask-for-help-and-get-an-answer-71b17a40d15442349eaecbfae083e46a)

@andyfierman okay that's helpfull and i got it