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Re: Advice for new coil



Original poster: Rich Simpson <richcreations@xxxxxxxxx>

It will be run at 60ma for the near future, I want it to run well that
way, was just hoping to not have to make a new coil if I got some more
NSTs, but I will...
what would be best for 15kv 60ma NST.

-Rich
On Apr 17, 2005, at 9:35 PM, Tesla list wrote:

Original poster: "Dr. Resonance" <resonance@xxxxxxxxxx>


If you are going to 120 mA, then use either a 10 or 12 inch dia. sec. coilform for even better performance.

Dr. Resonance


> > Since your wanting to upgrade to 120mA at 15KV, I > would probably go with a bit larger secodary. I did a > few calculations for you (using "TeslaMap" and > assuming 5% real world losses in a few items), and > this is what I came up with. You can change your > secondary wire, you could move that down to a 24 AWG, > that will move it to around 1200 turns, around 2,000 > ft, and around 2.5 lbs of wire. Keep in mind your res. > cap, and freq will change if you do a different top > load, but this can give you a general idea of the > setup. This will be close to one that TheDDN group is > assembling,(http://ddn.suroot.com/index.php? option=com_content&task=view&id= > 25&Itemid=33) > > ---------- Power Supply ---------- > NST V Out 15 kV > NST I Out 120 mA > NST Input V 120 V > NST Input F 60 Hz > NST VA 1,800.0 > NST Watts 1,825.5 W > NST Impedance 125 Kohms > Max Arc Length 72.6 in > NST PFC Cap 331.6 uF > > ---------- Primary Capacitor ---------- > Your Cap unknown > Resonate Cap 21.2 nF > LTR Static Cap 29.7 nF > LTR Sync Cap 40.3 nF > Your Cap Joules unknown > Resonate Joules 4.77 > Static Joules 6.68 > Sync Joules 9.07 > > ---------- Secondary Coil ---------- > Single build magnet wire > 26 AWG > Wire Length 2,491.0 ft > Wire Weight 1.91 lbs > Wire Resistance 102.2 ohms > Coil Height 27 in > Coil Diameter 6 in > Coil H/W Ratio 4.5 : 1 > Coil Turns 1,586.6 > Inductance 72.47 mH > Capacitance 11.00 pF > > ---------- Top Load ---------- > Overall Diameter 15 in > Ring Diameter 4 in > Top Load Adjustment 95 % > Top Load Capacitance 18.09 pF > > ---------- Top Load + Secondary ---------- > Resonate F 109.62 kHz > > ---------- Primary ---------- > Wire Diameter 0.25 in > Wire Spacing 0.25 in > Hole Diameter 8 in > Coil Angle 0 degrees > Coil Adjust 95 % > > Needed primary inductance with: > Your Cap unknown > Resonate Cap 39.76 uH > Larger Than Resonance Static Cap 28.40 uH > Larger Than Rresonance Sync Cap 20.92 uH > > Turn 1 0.5 uH > Turn 2 1.7 uH > Turn 3 3.6 uH > Turn 4 6.2 uH > Turn 5 9.5 uH > Turn 6 13.5 uH > Turn 7 18.2 uH > Turn 8 23.8 uH > Turn 9 30.1 uH > Turn 10 37.4 uH > Turn 11 45.6 uH > Turn 12 54.7 uH > Turn 13 64.8 uH > Turn 14 76.0 uH > Turn 15 88.3 uH overall diameter of 22.5", tubing > length of about 60 feet. > > > Hope that helped a bit for a general idea on your > setup... > ~Blimpie > > > --- Tesla list <tesla@xxxxxxxxxx> wrote: > > Original poster: Rich Simpson > > <richcreations@xxxxxxxxx> > > > > Hi Everyone, > > > > After destroying the secondary of my first coil by > > running it with a 6-MOT > > stack (it was only a 4" coil, and not very well > > made, but the burnt plastic > > smell was impressive) I decided to start again. > > > > I have all the thin walled 4" green sewer pipe (not > > foam cored) I could want. > > > > I do not want to use the MOTS again right now, but > > will continue to use > > NSTs instead. > > > > I have a single static (air blast) gap, made from 1" > > pipe, made of > > copper/pvc) fed by a shopvac > > > > Primary will be a flat pancake of 1/4 copper tubing, > > how many turns should > > it have? what outside dia? > > > > I have a lot of "beer bottle caps", in series > > strings of 3 bottles x > > however strings I need, I plan to build a MMC later, > > but cash is short. > > > > I have 15kv/60ma worth of NST right now, but want to > > be able to add more > > later (120ma total), how much is a 4" coil good for? > > > > I was planning on using 22AWG wire for the > > secondary, is this a good > > choice? About how tall should the secondary winding > > be? > > > > I tried using JavaTC, but I do not have enough info > > to figure it out, and I > > use a mac, so no wintesla, or other useful stuff... > > > > thanks, > > -Rich > > > > > > > > >