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Re: [TCML] More tc info
In a message dated 3/13/08 7:52:58 A.M. Eastern Standard Time,
The coil has a 15kv 30ma transformer
Primary is 6 turns of 10 awg plastic insulated copper wire with each turn on
top of each other the form has a diameter of 5 inches. The secondary sits In
the center of the primary the secondary is an uncountable number of turns of
28awg plastic insulated wire the form is 7 inches tall 2 inches wide. The
terminal is two 1 foot diameter stainless steel bowls soldered together the cap
is salt water that is saturated with salt
With glass boylan ginger ale bottles
With galvanised bolts. Linked together
With copper strips.. The spark gap(not to be confused with The safety gap)
Is composed of two "L" brackets with stainless steel bolts w/ end caps
I hope this helps
Sent from my Verizon Wireless BlackBerry
1) It is very possible that your primary is shorting internally. The
power supply is probably putting out 18-21 kV peak, if your gap is set right,
meaning that, with 6 turns close wound, you have 3000 V+ between turns. The
insulation on standard household wire is rated for about 600V giving you only
~1200V insulation between turns. You may find tiny pinpoints of black between
the turns. Spacing the windings may improve this.
2) For your secondary, PVC coated wire UL1007/1569 is only rated for 300V,
PVC MIL-spec MIL-W-16878E type B is 600V rated, and Teflon MIL-W-16878-E
(UL1213) is also 600V. The nominal OD for 28ga. is around 0.035" for Teflon
(figure 28 TPI) and 0.046" for the PVC" (about 21TPI) Meaning your secondary at 7"
is not more than 200 turns at best. H=7", R=1", N=200, meaning roughly:
3) At about 5 TPI I'm guessing your primary is wound about 1.2"=H X 2.5" R,
N=6, meaning roughly: Lp=7.25 mH. Theoretical voltage gain is sqrt(Lp/Ls) or
a voltage gain of less than 3.8.
4) Your maximum gap setting should not exceed ~6 mm. If your brackets are
fastened to a wooden base, be aware that above ~10 kV wood starts to become
conductive and power may be bypassing the gap inside the wood.
5) I suspect, but have not run the numbers, that your primary and secondary
are very out of tune.
These are just the most glaring problems, others may have more suggestions.
Hope this helps,
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