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Re: [TCML] Toroid Problems
Im not positive but i believe the calculator on deep fried neon is for
ltr cap size and not resonant. If this is the case then you need a
smaller cap value. I would check but im on a cell phone right now.
H/o from your description it sounds like you might just need a smaller
toroid, say 6x3?
On 8/4/08, Nicholas J. Goble <ngoble@xxxxxxx> wrote:
> I did not wire together various components and hope they'd work
> together. I did my research and used the calculators listed on
> deepfriedneon.com. Here are the specs for my coil:
>
> Transformer: 9/30 transformer
>
> Spark gap: air quenched, multi-electrode spark gap. There are five
> copper pipes, 3.5 inches in length that make up the electrodes. All
> the gaps fire beautifully. I got the plans off this website:
> http://www.kronjaeger.com/hv-old/misc/scotsgap/index.html
>
> Capacitor: I used the "Capacitor to Transformer Match" calculator on
> DeepFriedNeon and found that I needed a capacitance of .0088uF. The
> Tesla Map construction guide told me that I needed to multiply that by
> 1.414 to get my LTR capacitance of .01244uF. I bought 12 942C20P15K-F
> caps that are rated at 2000V and .15uF. I wired them in series to get
> a capacitance of .0124uF. Correct me if I'm wrong with these
> measurements.
>
> Primary: 1/4" OD copper tubing spaced 1/4". Inner diameter is 6.5". I
> did 13 turns just in case, but my calculations show that I only need 11
> turns to have the correct inductance. With 11 turns, the inductance of
> the primary is 40.147uH.
>
> Resonant Frequency of Primary: The capacitance is .0124uF. And the
> inductance (with some tuning) is .0345mH. That makes the resonant
> frequency 243.332kHz
>
> Secondary: For my secondary, I wound a 4.5" diameter PVC pipe that was
> sprayed NUMEROUS times with acrylic spray sealer. I sealed the ends
> with some PVC caps that I bought at Lowes and used caulk as a glue. I
> wound the secondary with 24 AWG wire. It was 21" tall. All in all,
> there were about 950 turns of wire. I sealed the form after winding
> too. Inductance is 19930uH and self cap is 8.316pF.
>
> Toroid: Explained in my main post, capacitance is approx 19.137pF.
>
> Resonant Frequency of Secondary: The capacitance of the toroid is
> 19.137pF, and that of the secondary is 8.316pF. Combined, the
> secondary circuit's capacitance is .000021453uF. It's inductance is
> 19.930mH. The resonant frequency is 243.344kHz.
>
> There are the specs. I thought that all those calculations were
> correct. What could be wrong? There are no wires on the inside of my
> secondary. If the secondary wire sparks with no toroid, could it just
> be a problem with my top load? Is it to big? Is my connection not
> good? I really want to get this thing working well. With a toroid.
> Any solutions or diagnoses?
>
> Thanks
>
> Nicholas Goble
>
>
> Lau, Gary wrote:
>
>>I see no mention of what you're using for a capacitor, or primary coil.
> You have verified that the primary and secondary resonant frequencies
> match, right? It does sound like they don't match with the toroid in
> place, but YOU need to gather all the numbers and verify this. One
> can't just throw together an NST, capacitor, primary and secondary
> coils, and hope it will all play together. If any one of them is the
> wrong value, it will be out of tune and won't work.
>>
>>Regards, Gary Lau
>>MA, USA
>>
>>> -----Original Message-----
>>> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
>>> Behalf Of Nicholas J. Goble
>>> Sent: Monday, August 04, 2008 1:38 PM
>>> To: tesla@xxxxxxxxxx
>>> Subject: [TCML] Toroid Problems
>>>
>>> Last night, I fired up my coil for the first time. I set everything up
>>> and made sure that all the connections were solid. When I plugged the
>>> NST in, the spark gap fired, but there were no sparks coming from the
>>> toroid. I tapped the entire primary, but got no streamers. At a few
>>> points, the safety gap was firing, so I guessed that the caps were
>>> working. I thought that the only thing that could be wrong was the
>>> toroid. When I disconnected the toroid and ran the coil, I got
>>> streamers and some corona coming from the tip of the secondary wire. I
>>> was able to tune the coil without the toroid. I got 5-6 inch
>>> streamers/sparks from the wire.
>>>
>>> Here are the specifications for my toroid:
>>> 4" height
>>> 17" outer diameter
>>> 9" inner diameter
>>> I took two flimsy 9" pie pans and glued them together. Then I wrapped
>>> 4" aluminum dryer duct tubing around it and secured the ends together
>>> with duct tape. I secured the tube's connection to the base with caulk
>>> on the rim of the pie pans. I took some aluminum foil and wrapped it
>>> around the duct taped section, and connected that to the base (pie
>>> pans) with more duct tape. I drilled a hole in the middle of the pans
>>> and attached a nut and bolt. I sanded off most of the enamel of the
>>> end of the secondary wire and secured it to the middle of the toroid
>>> with the bolt.
>>>
>>> My secondary is 4" dia and 21" tall. I'm using a 9/30 NST. Can anyone
>>> diagnose my problem? I dobut that my toroid is too big. If anything,
>>> I thought it would be too small. I used a nail to create a breakout
>>> point on the toroid while it was running and it still failed to produce
>>> streamers. What's the problem?
>>>
>>> Thanks
>>>
>>> Nicholas Goble
>>
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