[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: Designing Demo Coil
Original poster: FutureT@xxxxxxx
In a message dated 8/11/06 2:00:27 PM Eastern Daylight Time,
tesla@xxxxxxxxxx writes:
I found the equation for maximum spark length (1.7 *
Sqrt(input power in watts)), and that suggested a 450
watt system should do the job (a 15/30 NST). How
optimistic is that? Should I go for something larger?
I may be able to do a 12/60 system, depending on what
I can scrounge from the local sign shops. (I already
have one 12/30 that seems to work fine, albeit with a
slight buzz--I don't know why it was discarded.) I've
read a fair amount here, but have no practical
experience yet. I'm not sure just how efficient my
first coil will be, so I don't know how much power I
want.
Michael,
My TT-42 coil which can be seen at my website uses
a 4" x 19" secondary and gives about 42" sparks using
a robust 12/30 nst. Using a normal 12/30 nst it gives
38" sparks. I use a synchronous rotary gap for good
efficiency and good looking sparks. Using a static
gap, some spark length would be lost. If you build your
coil similar to mine, then it will be just as efficient. The
design is not super-critical.
I was also planning on using a 4" secondary since I
have the pipe, but I haven't settled on the other
parameters yet, except in general terms (TCBOR SG, LTR
MMC). Does 4" sound reasonable for something in the
450-900 watt range?
Yes, a 4" dia secondary is well suited for building a
TC that produces 36" sparks. My secondary plugs into
the base assembly for easy portability.
<http://hometown.aol.com/futuret/page3.html>http://hometown.aol.com/futuret/page3.html
John
Thanks to everyone for your help!
-Michael Johnson