Re: Still confused on LTR sized Caps

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

Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>

Hi Dan,

At 12:55 PM 8/27/2002 -0400, you wrote:
>
>
>Still a little confused on the LTR sized primary capacitors.  I assume the
>standard way to choose a primary capacitor is to choose a value which is
>charged to a maximum over the ac cycle of the high voltage output so that
>when a spark gap fires, the cap is charged at maximum at the peak of the
>high voltage output sine wave.  For this a 0.0106uF would be optimum for a
>15kV/60mA NST.

That is called the "resonant" size.

>
>Now I am very confused about LTR sized caps.  First, I assume the entire
>primary tank circuit's resonant frequency would change as a result of the
>larger primary capacitor.  

Yes.  The larger cap will lower the frequency of the primary so you will
have to tap fewer primary turns to get the frequency to match the seconadry
again.

Secondly, why are LTR sized caps used in the
>first place and what are their benefits?

LTR caps are "Larger Than Resonanat" cap values that allow higher power to
the system especially with sync rotary gaps.  With a rotary gap, you can
charge about 2.5 times the cap to the same voltage to get 2.5 times the
power.  The values and the number of Geek Group caps used for variuous
transformer gap configurations is at:

http://hot-streamer-dot-com/temp/MMCcapSales.gif

Richie has more infor at:

http://www.richieburnett.co.uk/tesla.shtml

http://www.richieburnett.co.uk/indkick.html#kick

Cheers,

	Terry


>
>Confused,
>Dan
>