Re: [TCML] Sphere Topload Coil

[resonance@xxxxxxxxxxxx]

This was a long time ago, but sec was 12 inch dia. and pri cap was .04 uF
with a 30" dia sphere topload.

They can use JAVATC to do the complete design.

Regards,

DC



> Hi DC,
>
> Well then, got any specs on the coil it ran on? If so, please send (off
> list is fine). I agree on the field control if comparing to a single
> sphere. However, Terry's Piranha coil and David's specs are pretty good
> examples of how to attain nice field control with sphere's. Looking at
> David's data, his coil is heavily top loaded. That's pretty cool! I
> think sphere's in this type of configuration may offer slightly more
> topC than a toroid of same minor and major dimensions. I guess it's the
> full sphere surface area versus the toroid surface area. Kind of caught
> me off guard. I had to get to a 9"x32" toroid to match his assumed
> frequency with the sphere's (assuming the cap really was .028uF).
>
> I imagine the price between the two is similar (not sure). If the 4
> sphere configuration is lower cost, it might make for a low cost
> polished top load with good field control like a toroid.
>
> Take care,
> Bart
>
> resonance@xxxxxxxxxxxx wrote:
>>
>> Years ago, I used a 30 inch dia. alum. sphere on one of my coils.  Seems
>> to work fine but a toroid does offer better electrostatic field control.
>>
>> Dr. Resonance
>>
>>
>>
>>> Thanks Gary. Maybe Mr. Weaver is the man!
>>> Thanks
>>> Bart
>>>
>>>
>>> Lau, Gary wrote:
>>>
>>>> Nope, it wasn't me.  But Gary Weaver comes to mind.
>>>>
>>>> Regards, Gary Lau
>>>> MA, USA
>>>>
>>>>
>>>>
>>>>> -----Original Message-----
>>>>> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
>>>>> Behalf Of bartb
>>>>> Sent: Monday, February 18, 2008 6:18 PM
>>>>> To: Tesla Coil Mailing List
>>>>> Subject: [TCML] Sphere Topload Coil
>>>>>
>>>>> Hi Everyone,
>>>>>
>>>>> Sometime back (quite a while I guess), I remember photo's of a pretty
>>>>> good sized coil with a large sphere top terminal (I'm thinking about
>>>>> 20"
>>>>> diameter). For some reason, Gary Lau comes to mind but I'm not sure.
>>>>> I'm
>>>>> curious of big sphere's and the system that drove them. I'm looking
>>>>> at
>>>>> breakout voltage as based on surface field strength and it would be
>>>>> nice
>>>>> to know a little something on the basic specs of those coils.
>>>>>
>>>>> So if anyone meeting those specs isn't too busy with life, please
>>>>> post
>>>>> some specs. I don't need the whole gap scene or anything of that
>>>>> nature.
>>>>> Just the basic secondary, top load, cap, and power supply data. Also,
>>>>> was a breakout point required or not would be nice to know.
>>>>>
>>>>> Reason: I'm advising someone regarding a rather large coil with a
>>>>> very
>>>>> large sphere. From my calculations, the sphere I think is too big for
>>>>> breakout on it's own. Calc's are one thing and those of you well
>>>>> experienced with sphere's may help fill the gap of uncertainty.
>>>>>
>>>>> Thanks,
>>>>> Bart
>>>>>
>>>>>
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>>>>
>>>>
>>>>
>>>>
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>>>
>>
>>
>> Dr. Resonance
>>
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>>
>>
>
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Dr. Resonance

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