Re: Transformerless Tesla coil

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Jolyon Vater Cox by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jolyon-at-vatercox.freeserve.co.uk>

Antonio,
I am sorry to say but I think there may be an error in the formula for the
"transfer" frequency (fo) as given by equation

 fo=(1/2*pi)*(L2*C1/L2final*C1final))^(1/2)
in your document.

This is because the answer for fo with the given parameters is 296207.4703Hz
(or 296.207kHz) not 30 kHz as suggested.

When I entered L1 in place of L2 in the formula I got 31266.34409 Hz or
31.266 kHz, which is much nearer to  the 30kHz indicated in the text.

So should the "L2" actually be replaced by "L1" in the above formula?

Jolyon.
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Sunday, July 28, 2002 4:25 AM
Subject: Transformerless Tesla coil


> Original poster: "Antonio Carlos M. de Queiroz by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <acmq-at-compuland-dot-com.br>
>
> Hi:
>
> I have just set up a page with an initial description of my
> directly coupled Tesla coil, with some pictures:
>
> http://www.coe.ufrj.br/~acmq/tesla/mres4.html
>
> The system is not better than a conventional coil (the design
> is more restricted), but works too. Some ideas can be useful,
> as how I assembled the MMC capacitor, how I connected the
> secondary coil, and a telescopic antenna as a tunable top load.
> I will now try to increase the output power by moving to mode
> 20-21, equivalent to a conventional coil with coupling coefficient
> 0.0488 and voltage gain 20.5, what will double the
> output voltage and multiply the power by 5. A question of making
> a 5 nF MMC and a 67 uH L1 inductor.
>
> Antonio Carlos M. de Queiroz
>
>
>
>