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Re: Home brew capacitor
Hi all
=snip=
>The use of 30 2-mil layers to get 60 mils of
>total dielectric thickness is a good idea provided you break the
>capacitors in slowly and orient the plates vertically. Or are you using
>a vacuum pump to extract the entrapped air?
I think the point got a little missed here, what i meant was that the total
capacitor consists of fifteen large value, low voltage capacitors in series.
Each layer of polypropelene is 2 Mil thick. By slipping each foil plate into
the plastic pocket and then stacking together gives a total film thickness
of 4 Mil. The max working voltage is only 1KV, so fifteen of these
sub-capacitors in series will give 15KV working total.
>What kind of a container did you put your caps in, and are you planning
>on driving your coil and the caps to the 15 KVRMS design limit (after
>break-in)?
>
>- Bert --
The container is a LDPE Cake box with the lid hot glued on. The leadout
studs are sealed through the lid with a NUT-WASHER-LID-WASHER-NUT
arrangement with silicone sealant sqeezed between the washers and the lid.
The silicone was left to partially cure before the nuts were finally
tightened. The cap is arranged with the plates vertical. A metal clamp in
type tyre valve(as used on alloy wheel rims) is fitted through the center of
the lid, the valve core removed and the cap screwed on as the oil
filler/breather.
At the moment my motly collection of transformers are all rated at 10KV
and comprise of two neons and two oil burners and can be conected in
combinations to give up to 110 mA. In the distant future (as time is hard to
come by at the moment) I hope to up rate to a microwave oven transformer
supply at about 12KV, but have no plans to go any higher.
*******************************************
Ian Hopley ----> i_hopley-at-wintermute.co.uk
Aberdeen
Scotland Callsign M M 1 A B A
*******************************************