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Re: Resonant cap?

Original poster: 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: tesla@xxxxxxxxxx
To: tesla@xxxxxxxxxx
Sent: Sun, 28 Jan 2007 12:26 AM
Subject: Re: Resonant cap?

Original poster: "JT Bowles" <<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%40pupman.com>tesla@xxxxxxxxxx>
>To: <mailto:tesla%40pupman.com>tesla@xxxxxxxxxx
>Subject: Re: Resonant cap?
>Date: Fri, 26 Jan 2007 21:36:10 -0700
>Original poster: <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%40pupman.com>tesla@xxxxxxxxxx
>To: <mailto:tesla%40pupman.com>tesla@xxxxxxxxxx
>Sent: Fri, 26 Jan 2007 12:56 AM
>Subject: Resonant cap?
>Original poster: "JT Bowles" <<<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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