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*To*: tesla-at-pupman-dot-com*Subject*: Re: Coil Specs*From*: "Tesla list" <tesla-at-pupman-dot-com>*Date*: Tue, 29 May 2001 18:39:15 -0600*In-Reply-To*: <00e501c0e887$41338ba0$1eb0530c-at-2.1.1>*Resent-Date*: Tue, 29 May 2001 18:41:55 -0600*Resent-From*: tesla-at-pupman-dot-com*Resent-Message-ID*: <ijZqKD.A.0DF.QHEF7-at-poodle>*Resent-Sender*: tesla-request-at-pupman-dot-com

Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net> Hi Ben, For a 9/30 NST, the resonant capacitor size is 8.842nF (0.008842uF). An LTR size is around 12nF. The "peak" voltage from your 9000 volt transformer is the rated RMS voltage (9000) multiplied by the square root of two. 9000 x SQRT(2) = 12728 volts. Lets say we get a bunch of Geek group caps at 100nF 2000 volts each. "I" would try for the LTR range in the 11 to 12 nF range. I am going off the chart at: http://hot-streamer-dot-com/TeslaCoils/Misc/NSTStudy/9-30.gif 100nF / 9 = 11.1nF which would be fine. 9 caps gives a voltage of 18,000 volts which is also fine. We should check the current which MMCCalc will do: -------------------------------------------- MMC Calculator Ver. 2.2 9/12/2000 Terry Fritz Transformer voltage = 9000 Transformer current = .03 Firing voltage = 12727.89 Fo = 200000 Break rate = 120 Thermal dissipation constant = 33 Individual cap value = .0000001 Strings Caps/Str Capacitance Voltage Temp C Cost I Arms 1 9 11.11 18000 2.84 16.20 :-)) :-)) 2.44 -------------------------------------------------------------------- 2 18 11.11 36000 0.71 64.80 :-)) :-)) 2.44 2 19 10.53 38000 0.64 68.40 :-)) :-)) 2.31 --------------------------------------------------------------------- 2.44 amps which a well within the capacitors range. So I would say to get 9 of the 0.1uF 2000 volt caps from Chris. That would run you $16.20. If you want a 8.8nF cap then get 11 of them. I think Sam used the very high voltage caps because that is what he had on hand. A variac is a super usefull thing to have. It makes tuning and such far easier. Hopefully this is what you wanted to know. Cheers, Terry At 04:35 PM 5/29/2001 -0500, you wrote: > > > Secondary: > Diameter- 42mm > Wire- 29AWG > Turns- 885 > Inducyance- 4.98mH > Reson. Frq- 1.150MHz > Primary: > Inner Diameter- 6.6cm > Outer Diameter-24.6cm > Wire Dia.- 5mm copper > Inductance(at 7) .007Mh > Gap: > Static > 10 sections of 10x2cm copper tubing > Caps: > -To be determined > Desired Qualities- > Voltage-50kv(copying, let me know if this is resonable) > uF- .0088 > Top Load: > Capacitance- 8.85pF > Diameter- 5.5cm > Crossection- 20cm > PowerSupply: > Output(volts)- 9KV > Current- 30mA > *How useful is a voltage controller? > > These are the specs(approxiamtly) of the coil I will be constructing. All > useful data is extremly appreciated. I need a little help with caps at the > moment. Check out > <http://www.powerlabs-dot-org/coil2.htm>http://www.powerlabs-dot-org/coil2.htm to see > what my design is based on. I have the MMC calculator but it is not working > for some reason. It gives no output of data, only takes everyting I will feed > it :) > > Thanks, > Ben > > >

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