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how can I build a high voltage capacitor? Answered

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steveastroukBest Answer (author)2012-04-06

How high ?

Double sided PCB material works pretty well to a couple of kV

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steveastrouk (author)nerd74732012-04-19

Keep reading, its nearer 32kV, if you use 1/16 FR4.

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nerd7473 (author)steveastrouk2012-04-06

what does pcb stand for isnt it prototyping circuit board?

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steveastrouk (author)nerd74732012-04-06

PRINTED circuit board - but in this case, unetched PCB, excelp Its helpful to etch a 10mm border around the edges, to prevent flashover.

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iceng (author)steveastrouk2012-04-06

An excellent suggestion keep arc length long for the high voltage copper plates.
FR4 has a Dielectric strength of 20 kV/mm
o.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.

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iceng (author)nerd74732012-04-19

FR4 is the manufacturers name for the fiberglass .

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nerd7473 (author)iceng2012-04-19

thanks i didn't know you really are a pro

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steveastrouk (author)nerd74732012-04-19
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mpilchfamily (author)2012-04-05

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. 

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Re-design (author)2012-04-05

Google "Leyden jar. You'll get many ideas from the result.

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