Re: Capacitors

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Mike Waddick by way of Terry Fritz <twftesla-at-uswest-dot-net>" <mikew-at-winternet-dot-com>

Tim,

Your cap size calaculated is .008mfd or 8nf. The string i got would work
perfectly for your tranny. the string has a capacitance of .01mfd and that
would work just fine. what kind of gap will you be using? If you use a SRSG
and a secondary with alot of turns (4" x 21" wound with 28awg wire) you
could get 40 inch arcs from that one little 15/30. If you are looking for
wire i would suggest that you get your wire from Mcmaster because it is
REALLY cheap for 28 awg wire. go to www.mcmaster-dot-com

(you can see a pic of a string that looks knd of like the one i would sell
you but the one i would sell is alot nicer, or even if you want i can just
sell you some caps with resistors) see it at: www.winternet-dot-com/~mikry

have fun and be safe,

MIKE
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Friday, December 22, 2000 3:55 PM
Subject: Re: Capacitors


> Original poster: "Tim by way of Terry Fritz <twftesla-at-uswest-dot-net>"
<warpath-at-wtp-dot-net>
>
> Hi Mike, Herein lies the question-what size cap do I need? I have tons of
> information on computing
> cap size but for the life of me, I can't make sense of it. Any and all
help
> is truly appreciated.My
> transformer is a 15000volt nst with output of 450VA at 30MA. So far this
is
> all I know except that I
> won't make a plate stack cap. Later, Tim
>
> Tesla list wrote:
>
> > Original poster: "Mike Waddick by way of Terry Fritz
> <twftesla-at-uswest-dot-net>" <mikew-at-winternet-dot-com>
> >
> > terry, tim,
> >
> > I agree with Terry totaly. I have made a homebuilt cap and it was big. I
had
> > it in a big plastic container and was filled with gallons of oil. I once
> > spilled the oil out and man was it messy. It weighed about 150 pounds
> > (atleast) i trashed the thing before every using it.
> >
> > I then bought some caps from Mike Novak who did a bulk buy. I used these
> > caps in a MMC that costed me about 80 dollers in teh end.
> >
> > i used to buy my caps from Hosfelt electronics. there GE caps that were
3kv
> > at .1mfd. These were nice little caps. And very cheap. Once i informed
Mike
> > Novak he canceled his order for the caps from teh bulk buy and went out
and
> > bought over 200 dollers worth of these caps. So with all the buying of
these
> > caps i bought out the last ones that had.
> >
> > do you know what size cap you will need? i made some strings that are
> > mounted on acrylic strips and are rated at .01 at 30kv and have drilled
> > brass hook ups.
> > i would be willing to sell you one of these strings for 20 dollers, they
> > should last awhile
> >
> > mike
> > ----- Original Message -----
> > From: "Tesla list" <tesla-at-pupman-dot-com>
> > To: <tesla-at-pupman-dot-com>
> > Sent: Thursday, December 21, 2000 9:34 PM
> > Subject: Re: Capacitors
> >
> > > Original poster: "Terry Fritz" <twftesla-at-uswest-dot-net>
> > >
> > > Hi Tim,
> > >
> > > Welcome to the wonderful world of coiling!!
> > >
> > > Your transformer is perfect but be sure to use safety gaps across it
so it
> > > does not burn out.  Tesla coils and caps can interact to create high
> > > voltages that can destroy an unprotected transformer.  A fancy filter
is
> > > nice like the ones below but a simple safety gap is the minimum.
> > >
> > > http://hot-streamer-dot-com/TeslaCoils/Misc/NSTFilt.jpg
> > > http://hot-streamer-dot-com/TeslaCoils/MyCoils/BigCoil/protection.jpg
> > >
http://hot-streamer-dot-com/TeslaCoils/MyCoils/SmallCoil/small_protection.jpg
> > >
> > > I "think" your LDPE sheets need to be like 60 to 90 mils for a 15kV
NST!?!
> > > I am not an expert on this but others will chime in here.  I do want
to
> > > point out that another brand new kind of primary cap called the MMC is
a
> > > far better choice IMHO.  They have obsoleted the oil filled poly caps
very
> > > quickly.  Information on this is at:
> > >
> > > http://hot-streamer-dot-com/TeslaCoils/MMCInfo/mmcinfo.htm
> > >
> > > Feel free to ask more questions because I am sure your have a bunch
:-))
> > >
> > > Cheers,
> > >
> > > Terry
> > >
> > >
> > >
> > > At 08:04 PM 12/21/2000 -0700, you wrote:
> > > >Hi to All, My name is Tim Walrath. I am endeavoring to build my first
> > > >Tesla Coil. I have purchased a 15000 volt neon sign transformer that
> > > >puts out 450VA at 30MA. I am wanting to build my own capacitors. I am
> > > >planning on using LDPE sheets at 6mil thickness and aluminun roof
> > > >flashing for the conductor plates. I am purchasing some polypropylene
to
> > > >make the cases and plexiglass to make the tops. I am having trouble
> > > >figuring out how to figure the capacitance needed for the caps- that
is
> > > >how much LDPE to use between each conductor plate. Math never was my
> > > >best subject but I do want to be able to figure this out. Any help
would
> > > >be appreciated. Thanks, Tim
> > > >
> > >
> > >
>
>
>