Re: what capacitor for TC...other newbie questions

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

Original poster: "Christopher Boden by way of Terry Fritz <twftesla-at-qwest-dot-net>" <chrisboden-at-hotmail-dot-com>

The Geek Group would be happy to supply you with MMC caps at wonderfully low 
prices. And if you get the .15 size the order should go in this week :). 
We're getting VERY close on both sizes for our big order.




>From: "Tesla list" <tesla-at-pupman-dot-com>
>Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>
>
>Hi Mike,
>
>Welcome to the list :-)
>
>Many of us are using "MMC capacitors" that are made of many smaller
>capacitors.  See:
>
>http://hot-streamer-dot-com/TeslaCoils/MMCInfo/mmcinfo.htm
>
>They are pretty easy to make and can be far cheaper than commercial caps.
>Be sure to check into this.  the cap will have to easily handle about 10
>amps RMS at say 200kHz.  It needs special high current construction so as
>not to fail due to the high RF currents.
>
>With a 15/60 transformer and a static (as opposed to a rotary) gap.  You
>will want a capacitor value in the 15-20nF range.  The cap should be about
>30kV for a commercial cap but an MMC can be 20kV since they are tough.  Be
>sure to use saftey spark gaps to protect the NST and caps from overvoltage.
>
>Spark gaps can be from very simple pipe sections to sync rotary gaps:
>
>http://people.ne.mediaone-dot-net/lau/tesla/RQGap.htm
>http://hot-streamer-dot-com/TeslaCoils/Misc/terrygap.jpg
>http://hot-streamer-dot-com/TeslaCoils/MyCoils/SmallCoil/small_gap1.jpg
>
>There is also the air "vortex" style gap that people really like.
>
>http://people.ne.mediaone-dot-net/lau/tesla/vortexgap.htm
>
>Lots of choices for spark gaps...
>
>28ga wire has about 73 turns per inch so 35 inches will give ~2500 turns
>which is sort of high.  24ga "may" be a bit better choice but 28 will work.
>  However, be sure your primary circuit can tune the coil.  You may need
>some extra turns on the primary...  There are computer programs an "us" to
>help you with all that if you need.
>
>Hope this helps.
>
>Cheers,
>
>	Terry
>
>
>At 04:20 PM 7/5/2001 -0700, you wrote:
> >hello all,
> >my name is mike secord, i have recently joined the
> >tesla list, and would like very much to attempt to
> >build a coil, i plan on using a polycarbonate hollow
> >rod, 5in OD-36in long, 28ga magnet wire, a france
> >15000v/60ma nst, my primary will be constructed from
> >.375in OD soft copper tubing (30 deg conical). i have
> >asssembled these materials so far,but i still need a
> >spark gap controller, and a capacitor bank. i saw the
> >web site for capacitor industries:
> >http://www.capacitorindustries-dot-com/materials.htm
> >rather than construct my own, i think i would rather
> >purchase something, i just don't know what to order
> >from the site....any suggestions? i also could use
> >some advice regarding a spark gap... thank you all
> >
> >mike
> >
> >__________________________________________________
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>
>


duck




Christopher A. Boden Geek#1
President / C.E.O. / Alpha Geek
The Geek Group
www.thegeekgroup-dot-org
Because the Geek shall inherit the Earth!


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