I am also in Minnesota, Saint Paul here.
On Wed, Jan 6, 2016 at 9:45 PM, Heather & Paul Novotny via Tesla <
tesla@xxxxxxxxxx> wrote:
> I think it's all 60 hz. I'm in USA (Minnesota) so should be good there.
> Thanks!
>
> I'm going to use 1 string of a series of 15 caps (942C20P15K) which should
> get me to .010uF and 30kV.
>
> I think I will start with 12 in series which will pretty closely match
> what I have with my bucket cap and see what the difference is in the
> streamers.
>
> Let me know if I am off in any of my thinking here.
>
> Otherwise - thanks so much for your help guys!
>
> Paul
> --------------------------------------------
> On Wed, 1/6/16, Jhowson4@xxxxxxxxxxx <Jhowson4@xxxxxxxxxxx> wrote:
>
> Subject: Re: [TCML] LTR Primary Cap on tesla coil
> To: "TCML tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Date: Wednesday, January 6, 2016, 10:17 AM
>
>
> The transformer will probably be labled 50\60hz. Its fine
> to run a 50hz transformer at 60hz but going the other way,
> might pose problems. You need to look at your location to
> figure out what your wall frequency is. A quick google
> search of line frequency in country X, will probably prove
> enlightening.
> Jim, is their more recent guidance with reguard to the mmc
> cap chart? I was under the assumption that the chart was
> decently well vetted by the community and sort of a go to
> standard. Is that still true?
> Cheers, Jay
> Sent from my Verizon 4G LTE Smartphone
> ------ Original message------From: p_novotny via Tesla Date:
> Wed, Jan 6, 2016 9:53 AMTo: Tesla Coil Mailing List;Cc:
> Subject:Re: [TCML] LTR Primary Cap on tesla coil
> Ok so according to the chart and to your
> calculations below I'd be looking for .01uF or 10nF. I
> have a static spark gap. 15 of the 942C20P15k in series
> would get me exactly .01uF. I'll have to check to make sure
> the transformer is 60 hz when I get home. Thanks guys.Sent
> on the new Sprint Network from my Samsung Galaxy
> S®4-------- Original message --------From: jimlux
> Date: 01/06/2016 7:58 AM (GMT-06:00) To: tesla@xxxxxxxxxx
> Subject: Re: [TCML] LTR Primary Cap on tesla coil On 1/5/16
> 9:48 PM, Heather & Paul Novotny via Tesla wrote:> Hi,
> I have a 12,000 v 30ma NST for my power supply.>>
> Currently I am using a 5gal bucket cap filled with beer
> bottles and saltwater. It measures .01315uF on my
> multimeter. I am getting about 12-15" streamers off my
> toroid with this setup.>> I would like to try some
> Cornell Dubilier caps and am wondering what the LTR cap size
> would be for my power supply?60 or 50 Hz?"Resonant" is where
> the reactance of the capacitor is the same magnitude as the
> reactance of the transformer.The transformer reactance is
> simply E/I or 12,000/0.030 = 400k (technically, it's j400k,
> because it's an inductor)The reactance of a capacitor is
> 1/(j*2*pi*frequency * C), where j is sqrt(-1). Typically,
> you'd see the reactance as -1/(j*omega*C) where omega
> =2*pi*frequency.what you want is to rearrange this a
> bit..400k = 1/(omega*C) --> C = 1/(omega*400k)for 60 Hz
> omega = 377, so C = 1/(377*400k) = 6.6 nFSo this is the
> resonant size (one you actually want to avoid)...You want
> Larger Than Resonant (LTR) ... typically 1.5-1.7 x the
> resonant size, which works out to 10-12 nF.If you're using
> the usual 2kV, 0.15 uF caps, 12 of them in series gets you
> there-> 12.5 nF @ 24kV or you could use 1600V caps..
> that's 19.2 kV, or 13 in series gives you 20.8 kV and 11.5
> nFwith a 15 kV transformer, the peak voltage is 1.414*15=
> 21.21 kV.>> I saw a formula for it but I don't know
> what all of the variable names mean in the formula.>>
> Can someone please help me with this?>> Thanks -
> Paul> _______________________________________________>
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