Re: this cap made for trouble?

• To: tesla-at-pupman-dot-com
• Subject: Re: this cap made for trouble?
• From: "bob golding" <yubba-at-clara-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Sun, 19 Dec 1999 09:56:18 -0700
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

hi Jan,
	Careful with those transparency sheets, They might be polystyrene or
Mylar.
You can check the RF dissipation by putting a small sample in a microwave
oven. If It gets warm it is no good for a cap. I would stick to the PE if I
where you. The foil sounds fine, if you have it too thick you get air gaps
when you put it together. Hope this helps.

cheers 
bob Golding

> I've made some tests with plastic bags (PE), and ordinary transparency
> sheets (like those you write on, not those for printer/copier), and both
> seem to stand 3kVAC very well. No clue about RF properties though. :o)
> 
> So, this is what I had in mind: 
>  - a couple of transparency sheets stacked up, with
>    household aluminium foil in between. goal is 10nF for 8kVAC
>  - aluminium foil folded twice or more often
>  - using the 10nF caps, a 4x4 cap array to be powered
>    by a 8kV 50mA NST (200W/400VA, cos(phi)=0.5)
>  - thin layer of liquid paraffine oil between alu & transp. sheet
>    during assembly, later whole thing immerged in paraffine oil
> 
> Does this sound ok?
> 
> I think that the transparency sheet will stand the strain, but not so
sure
> about the aluminium foil... What type of foil is used in commercial HV
> pulse caps? Any thicker than household alu foil?
> 
> Many thanks in advance
> 
>  - Jan
> 
> --
> *************************************************
>  Jan Florian Wagner
>  jwagner-at-cc.hut.fi, petwag-at-kolumbus.fi
>  http://www.dsh.edu.hel.fi
> 
> 
> 
> 

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