Re: [TCML] Hello. New Coiler needs advice.

[G Hunter <dogbrain_39560@xxxxxxxxx>]

Hi Ron,

In the 1990's I built a 4" coil based on a single 15/30 NST.  I used a cluster of four, 750ml wine bottles for roughly 6nF.

You don't really need bleeder resistors.  The NST secondary winding will short out the caps almost instantly after you power down.  If you really feel you must use bleeder resistors, there's no neat way to attach them to the bottles.  You might want to place your bleeders across the spark gap instead.  If I get a vote, I say skip them altogether.

Any particular reason why you are using glass bottle caps?  An MMC based on a series/parallel grid of polypropylene film & foil "snubber" caps would be much neater and more compact.  The only advantage to bottle caps is cost.  If you can spare a few extra bucks, go for the MMC instead. 

Cheers,

Greg

http://myweb.cableone.net/grcarhunter/junkbox1.htm


--- On Thu, 12/18/08, Ron Slack <owlman.ron@xxxxxxxxx> wrote:

> From: Ron Slack <owlman.ron@xxxxxxxxx>
> Subject: [TCML] Hello. New Coiler needs advice.
> To: tesla@xxxxxxxxxx
> Date: Thursday, December 18, 2008, 6:14 PM
> Hello All,
> 
>    I'm an EE Student looking for a unique hobby, and
> coiling seems to fit me
> perfectly.
> 
> I've been reading all I can find online for the last
> few weeks, including
> many of the posts to this list.
> I'm starting to come up with designs for my first coil
> using a 15/30 NST I
> got used from a local sign shop.
> Javatc says I need a LTR cap of 8nF for my tank. My plan is
> to use 5 wine
> bottle caps at a value of 1.55 - 1.62 nF each.
> Is there a good way to put a bleeder across caps like this?
> 
> Also, I'm a little fuzzy on the design of my spark gap.
>  playing with javatc
> for a bit, I came up with this:
> ----------------------------------------------------
> Static Spark Gap Inputs:
> ----------------------------------------------------
> 8 = Number of Electrodes
> 1 [inch] = Electrode Diameter
> 0.28 [inch] = Total Gap Spacing
> 
> ----------------------------------------------------
> Static Spark Gap Outputs:
> ----------------------------------------------------
> 0.04 [inch] = Gap Spacing Between Each Electrode
> 21213 [peak volts] = Charging Voltage
> 20390 [peak volts] = Arc Voltage
> 34333 [volts] = Voltage Gradient at Electrode
> 72822 [volts/inch] = Arc Voltage per unit
> 96.1 [%] = Percent Cp Charged When Gap Fires
> 10.312 [ms] = Time To Arc Voltage
> 97 [BPS] = Breaks Per Second
> 1.66 [joules] = Effective Cap Energy
> 0 [peak volts] = Terminal Voltage
> 161 [power] = Energy Across Gap
> 31.9 [inch] = Static Gap Spark Length (using energy
> equation)
> 
> 
> is it a good idea to have my arc voltage this close to
> Vpeak or should I
> close the gap a bit more?
> I figure if I set my safty gap just a little higher than
> .28"/2 for each
> side to ground I should be good.
> 
> 
> for my primary I plan to use
> 
> Primary Coil Inputs:
> ----------------------------------------------------
> 7.5 = Radius 1
> 13.5 = Radius 2
> 0 = Height 1
> 0 = Height 2
> 12.5 = Turns
> 0.25 = Wire Diameter
> 0.008 = Primary Cap (uF)
> 
> with a 6" by 30" secondary winding, altough I
> have yet to get some magnet
> wire.
> 
> 
> Thanks,
> Ron
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxxxxxx
> http://www.pupman.com/mailman/listinfo/tesla


      
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