Step 8: The Capacitor Bank

I used the same capacitors as my previous coil, but added six more. The ten old bottles had to be removed and mixed up again, as the salt settled out of the water. Also, I had to re-glue the wires extending from the tops, as the old glue had weakened and started to leak. The oil in the old ones appears to be molding (it's been almost 6 months), but I see no issues yet.

I glued all my capacitors to plywood sheets in groups of 4, 6, and 6. The plywood is screwed to the lower "deck" of my support structure. This way, I can remove a set of capacitors easily if there are any problems.

The total capacitance of my bank is about 0.0160µF, as opposed to 0.0104µF that is ideal according to the equation. Having less capacitance can be a problem, as the bank will overcharge and explode. Having exactly the right capacitance (while being nearly impossible to judge when using leyden jars) is a bad thing, because the perfect resonance may somehow damage the transformer. Having more capacitance doesn't really effect anything, and it can help if some of the capacitors fail.
You might be better off using this type of electrical box:<br> <br> http://www.lowes.com/pd_132845-295-56915301_4294821892_4294937087_?productId=3332608&amp;Ns=p_product_price|0&amp;pl=1&curren;tURL=%2Fpl_Electrical%2BBox_4294821892_4294937087_%3FNs%3Dp_product_price%7C0&amp;facetInfo=<br> <br> It is made to hold a switch and the breakout holes in the back/sides allow you to use these to clamp the wires in place so they can't tear out:<br> <br> http://www.lowes.com/pd_45112-15527-49650_4294821891_4294937087_?productId=1087255&amp;Ns=p_product_price|0&amp;pl=1&curren;tURL=%2Fpl_Conduit%2BFittings_4294821891_4294937087_%3FNs%3Dp_product_price%7C0&amp;facetInfo=<br> <br> It would be bigger then the box you used, but then the switch would be more securely mounted and completely concealed inside the box instead of hanging out slightly.
Yeah, I would suggest this to anyone attempting that step. I only did it my way because I didn't want to buy one, and had a small one lying around.
<p>5V USB Portable Tesla Coil<br><br>https://www.youtube.com/watch?v=lZrOns9xqPc<br><br>http://www.ebay.co.uk/sch/shars-stewa/m.html?_nkw=&amp;_armrs=1&amp;_ipg=&amp;_from=</p>
<p>Hello once again, I am looking for clarification regarding your idea of the Leyden Jars. If you could so kindly notify me about more details on how to make them, that would be great. Thanks. ~teslacoilman123</p>
can any other transformer work in place of NST because i dont have it and it would be great if you tell me the input output voltage for tesla coil's transformer.
would you any particular tape for this?
Could we use particle board, instead of plywood? I only say this because I have some lying around.
I think so, it depends on how conductive the glue or resin holding the particles together is. A simple test I did to test the plywood was to hook up the transformer to the wood, with the wires contacting points on the wood several inches apart, then turning on the transformer (plugging it in since I had no switch at the time, and seeing if it arcs or burns the wood. I'm pretty sure particle board would not be conductive, even at 15kV, but I'm no lumber expert.
EXPENSIVE transformer! <br>i need to find a inexpencive neon transformer
what type of wire did you use? Like what type of high voltage wire? and where can i get some?
sorry to keep bothering you, but when you covered the capacitors with aluminum foil, did you cover the bottom? Also I'm having trouble on how to connect them together. Say i had 10 capacitors. would they be attached in a single file? or would they have a figure 8 pattern to them
No problem! I did cover the bottom of each capacitor. They would be connected in &quot;parallel&quot;, meaning that all the foil would be wired together, and all the nails or wire would be connected, just like when you wire light bulbs in parallel.
I'm gonna make this for my third term project for my high school engineering class. It looks like a fun build. May i please have a copy of the pdf file. Oh and for the capacitors did you stick a nail in them or was it a piece of wire? -Irene
For the capcitors, I used wire. Nails would work, too. What .pdf are you referring to? The instructable?
I was wondering if I can have a copy to both of the instructables on pdf file
so height frequencies goes on the outer of the skin and low starts to penetrate but you have be careful because some height frequencies coils may feel fine and look ok but can cause nerve damage so unless you are a pro you wont know what is what
Yes. Even if it doesn't hurt, it can be harmful.
No i wass telling i know you had some questions in the guide
Replace the spark gap with a &quot;segmented gap&quot; (4 to 5 shorter gaps in series). This will reduce the heating in the gap and increase output.
I am thinking about doing this. I need more identical bolts first!
Why do you have the toroid? I think there would be a greater spark if a grounded wire was brought about 1 foot from the toroid.<br><br>Some large caps can be made using aluminum flashing, and sheet plastic, then enclosed ina PVC sealed, pipe filled with mineral oil.<br><br>regards,<br><br>Dennis
Thank you for commenting, Dennis!<br><br>The toroid acts as a small capacitor (all conductive metals have a capacitance, be it a small one), the toroid shape is ideal for building a small charge around its radius during the nano seconds between the high frequency pulses generated in the secondary circuit. This charge helps the energy to &quot;leave&quot; the circuit and for arcs. <br><br>Placing a grounded wire near the toroid does create larger sparks, as the electricity in the toroid is attracted to the ground. I've done this in my instructable, see images 4, 19, 20, 21, and some others. The tall thing next to the coil in certain images is actually the ground rod that I used, as I didn't hammer it in all the way.<br><br>I have heard of people creating capacitors in similar fashions, I plan to do that on my next coil, whenever that is. I used glass leyden jars just because they were simple and cheap, and I had all the materials lying around.

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Bio: I like to play with the more dangerous DIY stuff, but don't worry, the ones I upload are pretty safe if you follow the ...
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