Re[2]: Build own capacators

["Tesla list" <tesla@xxxxxxxxxx>]

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@xxxxxxxxxxxx>


 >> 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




 >>