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Re: [TCML] Beginning Tesla Design



Why not build your own capacitors? They will be cheap, should work fine, and for a science fair it would carry a lot more cachet to have an array of caps you made yourself. They won't be as efficient as factory-made caps, but for a demonstration device, homemade has many advantages.

PBT


----- Original Message ----- From: "Taylor Skidmore" <balt11t@xxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Monday, January 03, 2011 8:20 PM
Subject: Re: [TCML] Beginning Tesla Design


Well, no harm involved. I really want to use this Coil for a science fair project. My teacher, however, wants a project that really has no publicized results, so I'm having a little trouble on that end. I was thinking about something along the lines of adding a second toroid, letting it sit atop the first, but I really don't know what I could measure, or if that's a valid project at all.. Since I will be using the Coil in the fair, my budget grows exponentially, as my parents are suddenly willing to donate some money, heh. Any ideas?




On 1/3/2011 6:06 PM, Brandon Garretson wrote:
Sorry Taylor, I didnt mean to throw you a curve ball there.
What I was getting at is according to your TeslaMap output, your
primary cap size is very close to resonant, which means running the
coil in that configuration could create a condition that may cause the
secondary voltage in your NST to rise to a point well over what it is
safely rated to operate at and ultimately burn it out.
Secondly, using just enough caps in the MMC to reach the desired
capacitance, but ignoring the fact that they are rated for DC
operation is likely to significantly shorten their lives (perhaps to
just mere minutes).
Im not saying that you need to spend a lot of money and build a museum
piece, but you may find that by building it to the bare minimum that
looks like it should work on paper could cause it to go up in smoke on
its first test run.
Perhaps a $65 investment on a more durable design would serve you
better than $45 spent on burnt-out components.
I may be wrong, these things can be strange beasts, perhaps it could
last much longer than you need it to for the purpose its being built.
I would just hate to see it die before you got a chance to demonstrate it.
Ask a lot of questions and read through the TCML archives, there is a
lot information here.
Best of luck!

On Sat, Jan 1, 2011 at 7:38 PM, Taylor Skidmore<balt11t@xxxxxxxxx> wrote:

I'm not really sure how to respond to that, other than that my MMS is being supplie by a friend. I don't want this to be as big as possible, but rather a simple, small, economic design. I have approximately $45 to make this,
not
including my NST.
On Dec 31, 2010 12:27 PM, "Brandon Garretson"<garretsontech@xxxxxxxxx>
wrote:
Your primary cap looks a little small and close to resonant size, try to
get
it up just over 9nf like TeslaMap recommends for a static gap.
Also try to build it to handle at least 1.5 to 2 times your NST secondary
voltage as the caps you will likely use are rated for DC.
My 12/60 powered coil MMC is rated over 30kv.
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