I'm going to make a MMC using (22) .15microfarad capacitors rated at 2000v
ran in series, I think thats right, I was going to double check before
ordering the caps. Is it possible to give myself plenty of extra windings
on the primary and build a couple secondary coils and toroids just to
experiment? I've been playing around with javatc, its nice.
On Dec 14, 2013 7:28 PM, "Jim Lux" <jimlux@xxxxxxxxxxxxx> wrote:
> On 12/14/13 8:01 AM, shane bounds wrote:
>
>> Thanks Jim, I'll have to shorten the secondary up a bit from what I had
>> planned, (19" with around 950 turns on a 3.25 thin walled PVC tube with a
>> 12x3 or 13x4 toroid).
>>
>
> Don't bother.. that's a fine form factor.. that 4-5:1 is a "guideline",
> it's not like going to 6:1 causes instant failure.
>
> You might use one of the calculators (JavaTC for instance) to figure out,
> though, if you wind 800 turns it might work better).
>
>
> Your 13x4 toroid is fine, and it's easy to make another one out of dryer
> duct and a piepan and stick it on and see if it makes a difference.
>
> WHat are you using for a primary capacitor? That's usually the thing that
> drives the whole design, because certain values are easier to build/buy
> than others. The primary L is easy to adjust.. whether it winds up being 8
> turns or 10 turns or 14 turns isn't a big deal.
>
>
>
>
> But yeah this ones just a baby, if I can get 16" or
>
>> 18" spark length I'll be impressed, then maybe someday when i have a
>> better
>> understanding of them I'll build a monster. Thanks again
>> On Dec 14, 2013 2:20 PM, "Jim Lux" <jimlux@xxxxxxxxxxxxx> wrote:
>>
>> On 12/14/13 4:55 AM, shane bounds wrote:
>>>
>>> Hi, I'm building my first Tesla coil and was wondering if there is a
>>>> certain frequency you should try to reach with respect to the power of
>>>> your
>>>> transformer?
>>>>
>>>>
>>> Not really.
>>>
>>> The frequency of the coil is fairly unimportant as long as it's not too
>>> high or low (for a small coil, 200-400 kHz is typical). It's more
>>> determined by the physical dimensions of the secondary winding.
>>>
>>> What you want to do is size the coil to the size of the power supply: too
>>> big a coil driven by a small transformer is tough to get to work.
>>>
>>> A couple rules of thumb to get you started:
>>> (and run a tesla coil simulation/design program like JavaTC)
>>>
>>> the longest sparks you're likely to get is 1.7*sqrt(power in watts) (in
>>> inches). As a practical matter, a 12kV 30mA transformer is 360 W will
>>> give you sparks about 2 feet long.
>>>
>>>
>>>
>>> You want the overall diameter of the toroidal electrode (top load) to be
>>> at least 1/2 the height of the secondary coil, and more like equal. (at
>>> least for small coils). So if your secondary is 2 feet long, a toroid 2
>>> feet in diameter would work. 1 foot will also work, but will be a bit
>>> small.
>>>
>>> The height of the secondary winding (not necessarily the tube it's wound
>>> on) should be 4-5 times the diameter of the winding. This is shorter and
>>> more squat than a lot of pictures you'll see. A 4 inch diameter coil
>>> would
>>> then have windings that are 18 inches long, on a form that's a few inches
>>> longer (to give you some room to mount it.
>>>
>>>
>>> Figure on winding about 600-800 turns of wire on the secondary.
>>>
>>>
>>>
>>> I found one formula, but I'm not sure about it,kHz= 3032.5xw^
>>>
>>> -2767 - 96.4, not sure what the ^ is or if the formulas accurate. I've
>>>> got
>>>> a 12kv 30 mA nst giving me 360 watts. I'm building it on paper first and
>>>> trying to get a good understanding of it and at the moment my secondary
>>>> will have a frequency of 322.6 kHz
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