Re: [TCML] Tesla Coil Tuning

[Scott Bogard <sdbogard@xxxxxxxxx>]

Hi Cole,
     Your cap is way too big for a break rate that high, you should be 
using a sync gap with that cap.  Go to JavaTC, plug in your specs for 
your power supply and spark gap (everything else is unnecessary for this 
test) then try various cap values until your spark length maxes out. 
I've found around 60% charge to be best for high BPS systems (I consider 
700+ to be high bps)  for your system that is 1.8nf, not 18nf.  If you 
reconfigure for SRSG, using that cap, expected performance results are 
the same, 23 .3 inches.  So you have two options, shrink your cap a lot, 
or slow your gap down a lot.  I like high bps systems, but on such a low 
current, let alone fixed current, I hate to admit but SRSG might be a 
better route...

Scott Bogard.

On 6/15/2011 4:08 PM, Cole Awesome-Jordan wrote:
> Recently i installed an asynchronous rotating spark gap on my coil and
> its breaks rate is 1,100 bps (and it does fire continuously it stops and
> goes). And i and puzzled as to why the performance of the coil has not
> increased, it seems the same as when i used a static spark gap.
> I am tapped into the primary at 8.23 turns, because its where i find the
> streams are the best. However that being said the longest i can get is a
> 8".
>
> Here are the specs for the coil, i used TeslaMap5. Any insight would be
> appreciated.
>
>
> TeslaMap Coil Summary
> 6/15/2011
>
> ---------- Power Supply ----------
> NST V Out 10 kV
> NST I Out 23 mA
> NST Input V 120 V
> NST Input F 60 Hz
> NST VA 230.0
> NST Watts 239.1 W
> NST Impedance 435 Kohms
> Max Arc Length 26.3 in
> NST PFC Cap 42.4 uF
>
> ---------- Primary Capacitor ----------
> Your Cap 18.75 nF
> Resonate Cap 6.1 nF
> LTR Static Cap 8.5 nF
> LTR Sync Cap 11.6 nF
>
> ---------- Secondary Coil ----------
> Single build magnet wire
> 26 AWG
> Wire Length 968.7 ft
> Wire Weight 0.74 lbs
> Wire Resistance 39.7 ohms
> Coil Height 18 in
> Coil Diameter 3.5 in
> Coil H/W Ratio 5.1 : 1
> Coil Turns 1,057.8
> Inductance 17.50 mH
> Capacitance 7.00 pF
>
> ---------- Top Load ----------
> Overall Diameter (1) 16 in
> Ring Diameter (1) 4 in
> Overall Diameter (2) (optional) in
> Ring Diameter (2) (optional) in
> Sphere Diameter (optional) in
> Top Load Adjustment 95 %
> Top Load Capacitance 19.01 pF
>
> ---------- Top Load + Secondary ----------
> Resonate F 235.87 kHz
>
> ---------- Primary ----------
> Wire Diameter .25 in
> Wire Spacing .75 in
> Hole Diameter 5.5 in
> Coil Angle 0 degrees
> Coil Adjust 95 %
>
> Needed primary inductance with:
> Your Cap 15.26 uH
> Resonate Cap 46.89 uH
> LTR Static Cap 33.49 uH
> LTR Sync Cap 24.68 uH
>
> Turn 1 0.3 uH
> Turn 2 1.0 uH
> Turn 3 2.3 uH
> Turn 4 4.2 uH
> Turn 5 6.7 uH
> Turn 6 10.0 uH
> Turn 7 14.2 uH
> Turn 8 19.3 uH
> Turn 9 25.5 uH
> Turn 10 32.8 uH
> Turn 11 41.4 uH
> Turn 12 51.3 uH
> Turn 13 62.7 uH
> Turn 14 75.6 uH
> Turn 15 90.1 uH
>
>
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