Re: Need help Tuning a new coil (reply)

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Terry Fritz <teslalist@xxxxxxxxxxxxxxxxxxxxxxx>

Hi Jim,

At 09:32 AM 5/2/2005, you wrote:

> Ok Terry now you've got me really scared! No seriously I reinput my data 
> into a spreadsheet and win-Tesla and I'm getting conflicting results.
> Spreadsheet Input
> 4.5"= outside diameter of my pvc pipe
> 22 gauge wire
> 21" length
> Output
> Wire dia=0.025
> Turns/in=39.4
> number turns @ 97%=803
> 14.2 mH
> Win-Tesla results varies somewhat.
> This is the data I built my coil to. I guess I'm still missing some 
> rudimentary concept.

The numbers differ slightly from what I thought you had but not a big deal.


> I'm trying to find the papers on the caps I'm using for the safety gap. 
> Printed on the cap is N4700 30k. I'm wondering if this is the biggest part 
> of my problem.

If they are 4700pF it IS!  If they were 470pF I would think the label would 
be 471 for 47 with one zero behind it....  But goodness nows since no two 
people label odd caps the same...  Best just to use a capacitance meter if 
you have one.


> The main cap I'm using is rather large. Can a large resistor be wired 
> across the terminals in a similar manner as the MMC configuration or is it 
> safer to discharge the caps another way?

Just wire up a bunch of 1 of 10 Meg resistors.  Do not directly short 
primary caps since the high currents might damage them.

Cheers,

        Terry

> Thanks
> Jim