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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