How high ? Double sided PCB material works pretty well to a couple of kV
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I need at least 20kv
Keep reading, its nearer 32kV, if you use 1/16 FR4.
what does pcb stand for isnt it prototyping circuit board?
PRINTED circuit board - but in this case, unetched PCB, excelp Its helpful to etch a 10mm border around the edges, to prevent flashover.
An excellent suggestion keep arc length long for the high voltage copper plates.FR4 has a Dielectric strength of 20 kV/mmo.063 FR4 is about 17.1pF per sq inch brake down 32KV.o.032 FR4 is about 33.7pF per sq inch brake down 16KV.
whats fr4 mean?
FR4 is the manufacturers name for the fiberglass .
thanks i didn't know you really are a pro
Fibre Reinforced - FR.
Do you have access to any ionic conducting liquid such as boric acid or sodium borate? If not you won't be able to build a high voltage cap. A quick look at the Wikipedia article about electrolytic capacitors will tell you what they are made of.
Google "Leyden jar. You'll get many ideas from the result.