[Prev][Next][Index][Thread]
New Coiler
From: Patrick J. Gustafson[SMTP:gustafpj-at-uwec.edu]
Sent: Tuesday, September 09, 1997 4:12 AM
To: Tesla List
Subject: New Coiler
Hello all,
I have been patiently reading the list for quite some time now, but I
could not get my questions to post on the list. Thanks to Chip, this
problem has been finally resolved. Here are the concerns that I have as
of yet:
1. I have a two layer secondary coil with 28 gauge wire close wound
for 21.6" (both layers). The first layer is at 6" in dia. and the
second layer is at 6.125" in dia. The calculated resonant freq's are
108.71 kHz and 106.45 kHz respectively, and the calculated inductances
are 91.84 mH and 95.49 mH also respectively. Now since I layered in
parallel, can I add together the inductance values directly? ( i.e. the
new value would be 187.33 mH)
2. Should I be concerned with the differing resonant freq's when
calculating the needed primary capacitance?
3. How do you determine (a) the inductance (of chokes) needed to stop
the voltage spikes from reaching the NST's, and (b) what ratings the
parallel resistors that accompany these chokes should have?
4. What capacitance should I use for my protection cap. given the
power supply below?
5. For the protective spark gap for the NST's, how is the ground
electrode incorporated into this?
Here are the specs. of my Tesla coil:
Primary Coil - 16 turn, 1/4" soft copper tubing with 5/16" spacing.
Inner dia. is 8" and outer dia. is approximately 25".
Secondary Coils - As stated above. Note: Went for inductance by using
28 gauge wire, also to see if it can withstand the punishment.
Power Supply - 15 kV -at- 90 mA NST's. ((3) 15 kV -at- 30 mA in parallel)
Toroid - 25" outer dia. with a 5" cross section.
Spark Gap Electrodes - 3/4" thick by 2" long highly polished steel, with
3/8" radius of curvature on one end.
Spark Gap - Single static.
Components not made yet:
- Primary capacitor (Calculated to need about .0226 uF. Anyone have
problems with using mylar for the di-electric?)
- Protective capacitor.
- Chokes.
Some info:
I am a Physic's major, mathematics minor at the University of Wisconsin
Eau Claire, so I am quite familiar with most of the terminology involved
in Tesla coils. This is my first Tesla coil project, which I am
building for the Physic's Dept. (and they are funding!!) for
demonstrations on inductance and E&M fields. I can already see the
limitations of these 2 coil systems, and may soon have to start
researching into magnifiers.
Any help greatly appreciated.
Patrick Gustafson