https://www.teslacoildesign.com/appendix.html
* Introduction
* Design
+ Theory Of Operation
+ Power Supply
+ Primary Capacitance
+ Secondary Coil
+ Top Load
+ Primary Coil
* Construction
+ Schematic
+ Parts >>
o Power Supply (NST)
o Primary Capacitors (MMC)
o Spark Gap
o Primary Coil
o Secondary Coil
o Top Load
o PFC Capacitors
o NST Protection
o Line Filters
o Chassis
+ Required Tools
+ Wiring
+ Grounding
* Operation
+ Safety
+ Adjusting Gaps
+ Tuning
+ Fun
+ Troubleshooting
* Appendix
+ FAQ
+ Helpful Links
+ Miscellaneous
* Menu
* Introduction
* Design
* Construction
* Operation
* Appendix
FAQ
Appendix
Should I build a Tesla coil for a Science Fair?
I don't recommend building a Tesla coil for a science fair for the
following reasons:
Tesla coils (even small ones) are inherently dangerous. The primary
circuit can contain hundreds of amps, which is certainly more than
enough to be lethal. The primary capacitor can hold a lethal charge
for quite a while, even after turning off the Tesla coil. The power
supply will need to output a dangerously high voltage (at least 5000
volts, otherwise the spark gaps may not operate properly). The spark
gaps produce loud noise and UV radiation. The high voltages will
create some ozone and various nitrogenous compounds which can be
damaging to the mucous membranes and can cause headaches. Tesla coils
will emit a fairly large amount of RF noise, which generally isn't a
problem but does have the potential to interfere with cell phones,
pacemakers, radar, radio, etc. They can send voltage spikes back into
the building wiring and potentially destroy anything that's plugged
in. You'll have to restrict access to the area around the Tesla coil
and constantly watch it - which is often impractical. While it's
possible to mitigate some of these risks, a Tesla coil can never be
made completely safe, and making it as safe as possible will make an
already difficult project even more difficult.
Proper grounding can be difficult. A ground rod is the best solution,
but pounding one in and running a line to it may not be possible.
Tesla coils tend to require a lot of adjustments and they often break
down. Operating one safely, and keeping it running will require a
fairly high degree of electronics knowledge and experience.
When all the potential safety issues, legal issues and practical
issues are considered, it becomes clear that a science fair is not a
good venue for a Tesla coil.
A solid state Tesla coil may be a possible alternative, but they
share most of the same issues with classic Tesla coils. I recommend
considering a Jacob's ladder. However, a Jacob's ladder still poses
many safety issues.
What are some methods to improve efficiency and increase arc length?
Replacing a static spark gap with a rotary spark gap can increase arc
length around 20%. Use a variac to increase NST supply voltage to
140V / 240V. Move the primary coil closer to the secondary coil
(unless you see racing arcs on the secondary coil). Increase the size
of the top load.
How much will my electrical bill increase after running my Tesla
coil?
An average sized Tesla coil that generates 2' to 4' arcs typically
operates on about 1000 watts. Electricity typically costs about $0.10
/ kWh (kilowatt hour). Therefore to operate a typical Tesla coil for
1 hour will cost about $0.10 (however, it's very rare that a Tesla
coil will be operated continuously for an hour).
If I switch from a 9kV NST to a 15kV NST will I have to rebuild the
entire Tesla coil?
No. You'll need to adjust the MMC capacitance, reset the spark gaps
and re-tune the coil. You can also increase the size of the top load
and adjust the PFC cap, but you don't have to. All the other parts
should work fine.
Does it matter if the primary and secondary coils are wound in the
same direction?
No. the direction of winding will affect the phase in the primary and
secondary, but it won't effect the operation of the Tesla coil. Try
flipping your primary coil upside down and see for yourself.
Why build a Tesla coil?
Building Tesla coils is a great way to learn about electricity,
electrical components, assembling / wiring components and safety.
It's also a good opportunity to work with friends and family in a
team effort. And creating lightning is totally cool! Although, I've
had limited success impressing chicks.
How much does it cost to build a Tesla coil?
Cost will depend on many factors, mostly how much you can salvage.
Used NSTs are often much cheaper, sometimes even free. MMC caps,
magnet wire, good PVC and dryer duct are all difficult to salvage and
will probably have to be bought new. A small coil might be built for
under $100. A large Tesla coil with "nice" parts can cost several
hundred dollars.
Where can I get the parts for a Tesla coil?
Many of the parts can be found at the local home improvement store
(Home Depot, Lowe's) or at salvage / recycling centers, or on the
Internet. Check out Alan's store at Tesla Stuff. He has a nice
selection of Tesla coil components including "hard to find" and "one
of a kind" items.
Can I harvest free energy or power an "off the grid" electrical
system with a Tesla coil?
Many people have realized our fiat monetary system and corrupt
political leadership will likely lead to increased financial and
political disorder - and possible electrical outages and price
increases. I'm often asked if a Tesla coil can be used to generate or
gather power. No, a Tesla coil cannot harvest free energy, ambient
energy, operate at "over-unity" or generate any useful power. If
you're concerned about power outages and want to be energy
independent, I recommend solar panels and / or wind turbines with
batteries to supply electricity. Please be very cautious about "free
energy" or "over-unity" scams.
top
Helpful Links
Appendix
These resources have helped me a great deal, and hopefully they can
help you too.
Tesla Coil Mailing List
If you have a question about Tesla coils, it's probably been asked
and answered in the searchable archive.
Tesla Stuff
For several years Alan has provided high quality Tesla coil
components and plans including "hard to find" and "one of a kind"
items.
Wikipedia
A pretty good overview of Tesla coils.
octopart.com
Octopart is a search engine for electronic parts.
Tesla Coil Web Ring
A list of Tesla coil orientated websites.
Steve's High Voltage
Interesting site with solid state musical Tesla coils, vacuum tube
Tesla coils, Marx generators, induction heating and pulse power.
Classic Tesla
A good online JAVA design program from Bart Anderson.
Circuit Simulator
A nice java circuit simulator applet. Tesla coil circuit is located
in: Circuits -> Misc Devices -> Spark Gap
www.richieburnett.co.uk
Lots of good Tesla coil information.
capturedlightning.com
Teslamania, Bert Hickman's site about Quarter Shrinking, Lichtenberg
Figures, Tesla Coils, Nikola Tesla, Pulsed Power, and big Arcs and
Sparks
Tesla's autobiography - My Inventions
Tesla recounts his life in his own words. This text was first
published in Electrical Experimenter magazine in 1919.
TESLA.NU
Matt's Tesla coil website (Swedish ONLY!)
top
Miscellaneous
Appendix
Video Of My Tesla Coil
Download a video of my Tesla coil producing 4 foot arcs.
Pictures Of My Tesla Coils
You can view a couple pictures of my Tesla coils.
Obligatory Legal Disclaimer
The information presented in this page is not guaranteed to be
accurate. The decision to follow recommendations in this page is the
responsibility of the reader. The author of this page (Kevin Wilson)
is not responsible for any personal injury or property damage.
Copyright
The entire content included in this website, including but not
limited to text, graphics or code is copyrighted as a collective work
under the United States and other copyright laws, and is the property
of Kevin Wilson. Any use, including but not limited to reproduction,
distribution, display or transmission of the content of this website
is strictly prohibited without the express written permission of
Kevin Wilson.
top
Just something for the bots An interesting idea another. Don't forget
yep, more emails
* Introduction
* Design
* Construction
* Operation
* Appendix
Printing is not available due to copyright infringement issues.
Sorry,
Kevin