RE: Re[2]: Build own capacators

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Dave Halliday" <dh@xxxxxxxxxxxxxx>

The individual MMC capacitors are each 150nF

You wire them in series to get the higher voltage and the correct
(lower) capacitance.

My point was that you would have to take over 480 of these devices to
replace _one_single_MMC_capacitor and you would need to multiply that
480 by however-many capacitors you were using to make up your MMC unit.

For a string of 12 MMCs, this would be 5,800 devices.

Dave

> -----Original Message-----
> From: Tesla list [mailto:tesla@xxxxxxxxxx]
> Sent: Tuesday, December 20, 2005 10:52 AM
> To: tesla@xxxxxxxxxx
> Subject: Re[2]: Build own capacators
>
>
> Original poster: Illicium Verum <sebas@xxxxxxxxxxxxxxxx>
>
>
> Hello Tim,
>
> yes they where quite common in old radios and come in small values,
> but... a standard MMC for a 15KV 30mA NST is only 9.16 (out of my
> head) definitely not 150nF as this would require a 15KV 700mA
> transformer (out of my calculator ;)
>
>
> But your question was how to build one yourself and calculate the
> required material to build something similar but than with a higher
> voltage and capacitance.
>
>
> Unfortunately I don't know the answer on that one.
>
> Maybe someone else on the list?
>
>
> Sebastiaan
>
>
>
>
>
> Tuesday, December 20, 2005, 1:42:06 PM, you wrote:
>
>
>  > Original poster: "Dave Halliday"
> <<mailto:dh@xxxxxxxxxxxxxx>dh@xxxxxxxxxxxxxx>
>
>
>  > These are variable capacitors used for tuning transmitters.
>
>
>  > Quick heads up:
>
>  > pF = Pico Farads
>
>  > nF = Nano Farads
>
>  > one nF = 1,000pF
>
>
>  > Look at the specs for the units -- the unit at the top left of the
>
>  > screen is adjustable from 10 to 310 pF, is rated for 3kV
> and measures
>
>  > 200mm * 75mm * 95mm.
>
>
>  > You are talking about a unit that is eight inches by three
> inches by
>
>  > 3.70 inches that has a maximum capacitance of 310pF.
>
>
>  > The standard MMC capacitor has a capacitance of 150nF
> which translates
>
>  > into 150,000pF
>
>
>  > You would need 483.8 of these variable capacitors to create __one__
>
>  > MMC...
>
>
>
>
>   >> -----Original Message-----
>
>   >> From: Tesla list [mailto:tesla@xxxxxxxxxx]
>
>   >> Sent: Monday, December 19, 2005 5:17 PM
>
>   >> To: <mailto:tesla@xxxxxxxxxx>tesla@xxxxxxxxxx
>
>   >> Subject: Re: Build own capacators
>
>
>
>   >> Original poster: "Tim_S"
> <<mailto:stm800@xxxxxxxxxxxx>stm800@city-> net.com>
>
>
>   >> ok
> not to open back up the flaming thing.to
> build or not to build.
>
>   >> someone posted this link and i looked back thru my archives
>
>   >> but i could not
>
>   >> find who it was.
>
>   >>
> <http://www.cq.hu/ha8du/kondi.html>> http://www.cq.hu/ha8du/kondi.html
>
>
>   >> these are works of art.i want to build something like this.
>
>   >> what i ask is which expert on the list would help with just
>
>   >> the calculations
>
>   >> of determining the maximinum value of capacitance and
> working voltage?
>
>
>   >> i will do all the building...i have the necessary machinery
>
>   >> and materials.
>
>
>   >> tim s
>
>
>
>
>   >>
>
>
>
>
>
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>