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Re: Resonant cap?



Original poster: otmaskin5@xxxxxxx Thanks JT. I can see where that could frustrate you. Good luck with your project & safe coiling. Dennis


-----Original Message-----
From: tesla@xxxxxxxxxx
To: tesla@xxxxxxxxxx
Sent: Mon, 29 Jan 2007 1:09 AM
Subject: Re: Resonant cap?

Original poster: "JT Bowles" <<mailto:jasotb%40hotmail.com>jasotb@xxxxxxxxxxx>

My apologies if I offended you. That was not my intention. I am reletively new (about 2 years experience). I had been told to use the online calculators once or twice before, and I must have been somewhat annoyed by the repetition. Again, sorry for any offense I may have caused.

This will turn out to be an interesting coil. 20W, I am aiming for at least 5" output.

>From: "Tesla list" <<mailto:tesla%40pupman.com>tesla@xxxxxxxxxx>
>To: <mailto:tesla%40pupman.com>tesla@xxxxxxxxxx
>Subject: Re: Resonant cap?
>Date: Sun, 28 Jan 2007 14:48:31 -0700
>
>Original poster: <mailto:otmaskin5%40aol.com>otmaskin5@xxxxxxx
>
>Hey JT, regarding your response to my post - for the first time, I >know online calculators are for 50/60 hz. I guess I was "reading >into" your inquiry & I misunderstood that maybe you a 60 hz >transformer & that you were somehow trying to get to a 40khz coil or >something. Not knowing your level of expertise, I thought I would >offer you a suggestion. Just trying to be helpful. Lighten >up. Dennis Hopkinton MA
>
>
>
>
>-----Original Message-----
>From: <mailto:tesla%40pupman.com>tesla@xxxxxxxxxx
>To: <mailto:tesla%40pupman.com>tesla@xxxxxxxxxx
>Sent: Sun, 28 Jan 2007 12:26 AM
>Subject: Re: Resonant cap?
>
>Original poster: "JT Bowles" <<<mailto:jasotb%2540hotmail.com%3ejasotb%40hotmail.com>mailto:jasotb%40hotmail.com>jasotb@xxxxxxxxxxx>
>
>Hi JT,
>
>For your 30KHz transformer, the formulas that you want are these:
>
>Zout = Vs_oc_rms/Is_sc_rms
>
>Cres (nf) = 10^9 / (2*pi*freq*Zout)
>
>use 30KHz for your frequency. The assumption here is that the >winding resistance is insignificant compared to the current limiting >leakage reactance. If you can measure the primary and secondary >winding resistance, we can verify the assumption.
>
>Gerry R.
>
>-----------------------------------------------------------------------------
>
>For the...thrid time now, online calculators only work for 50/60Hz.......
>
>My Transformer runs at 30kHz, 2KV AC, 10ma.
>
>Again, you cannot use an online calculator in this case. Go back to >deep fried neon. Look above where you put in the voltage and >current. It has a selection for"50 Hz" and "60Hz". NO 30KHZ.
>
>So far, I have only received one real response; 26.5pF. I calculated >by hand and received a similar answer. I need some more opinions though.
>
> >From: "Tesla list" <<<mailto:tesla%2540pupman.com%3etesla%40pupman.com>mailto:tesla%40pupman.com>tesla@xxxxxxxxxx> > >To: <<mailto:tesla%2540pupman.com%3etesla%40pupman.com>mailto:tesla%40pupman.com>tesla@xxxxxxxxxx
> >Subject: Re: Resonant cap?
> >Date: Fri, 26 Jan 2007 21:36:10 -0700
> >
> >Original poster: <<mailto:otmaskin5%2540aol.com%3eotmaskin5%40aol.com>mailto:otmaskin5%40aol.com>otmaskin5@xxxxxxx
> >
> >JT, there is called Deep Fried Neon which I've found very helpful > in >designing a coil and calculating what you want. I don't > recall >seeing this site discussed on this list & the other TC > design >softward is probably considerably more refined and accurate > - I >don't know - but the I have used the Deep Fried site & it > seems to >work for me. It is S-I-M-P-L-E & easy to use, which is > why I have >used it. I'm still a relative newbie.
> >
> >There is an icon to click on to calculate required capacitance for > a >given transformer. Just plug in the 2 key variables 2KVA & 10mA > - & >it will tell you what resonant capacitance you need. You'll > want to >take this value & increase it by 50% to help protect > your >transformer & for other reasons.
> >
> >Anyway, check you the site. There are significantly > more >knowledgeable people on this list, so I'd be interested in > their >assessment of design software on the Deep Fried Neon site. > Safe >coiling, Dennis Hopkinton MA.
> >
> >
> >-----Original Message-----
> >From: <<mailto:tesla%2540pupman.com%3etesla%40pupman.com>mailto:tesla%40pupman.com>tesla@xxxxxxxxxx > >To: <<mailto:tesla%2540pupman.com%3etesla%40pupman.com>mailto:tesla%40pupman.com>tesla@xxxxxxxxxx
> >Sent: Fri, 26 Jan 2007 12:56 AM
> >Subject: Resonant cap?
> >
> >Original poster: "JT Bowles" > <<<<mailto:jasotb%252540hotmail.com%253ejasotb%2540hotmail.com%3emailto%3ajasotb%2540hotmail.com%3ejasotb%40hotmail.com>mailto:jasotb%2540hotmail.com%3ejasotb%40hotmail.com>mailto:jasotb%40hotmail.com>jasotb@xxxxxxxxxxx>
>
> >
> >Its me again. I have looked all over the net for the > appropriate >equation, but I have not found it.
> >
> >Can someone tell me what the resonant capacitor would be for > a >2KVAC, 10ma transformer, running at 30khz?
> >
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