Re: Variable Cap In Secondary?

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

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

Hi,

I have looked into using a 15kV 500pF vacuum cap to do tuning but the
voltage or current always gets too high before any real tuning would be
achieved.  All the models tend to point to either a very high voltage cap
(at the expense of output voltage in the secondary) or many caps in
parallel in the primary.  Just no clear good way to do it.  Them caps run
about $700 a pop unless you can get them second hand...

Cheers,

	Terry


At 08:26 PM 4/7/2001 -0400, you wrote:
>I have seen variable tuned capacitors on E-Bay.  Think they are used for
>radio transmitting stuff, or whatever you can dream up.  If you could build
>one of those such to with stand the high voltage it would be a pretty cool
>way
>to do some fine tuning.  Maybe even motorize it so that you could fine tune
>on the fly.  I have never tried it, however have thought about wanting to do
>it.
>
>Cheers,
>Bill
>
>----- Original Message -----
>From: Tesla list <tesla-at-pupman-dot-com>
>To: <tesla-at-pupman-dot-com>
>Sent: Saturday, April 07, 2001 7:24 PM
>Subject: Variable Cap In Secondary?
>
>
>> Original poster: "Jake Draper by way of Terry Fritz <twftesla-at-uswest-dot-net>"
><cybermecium2-at-home-dot-com>
>>
>> I was looking around on the net for information about Tesla Coils and I
>> stumbled accross an About-dot-com Physics Dictionary definition stating that
>it is
>> a device to create high voltage at high frequency. I already knew that,
>but it
>> says something about a variable capacitor with the secondary to tune it
>with
>> the primary. Has anybody ever seen or heard of anything like this? The URL
>is
>>
><http://physics.about-dot-com/science/physics/library/dict/bldefteslacoil.htm>h
>> ttp://physics.about-dot-com/science/physics/library/dict/bldefteslacoil.htm
>>
>>
>>
>