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Re: RE: [TCML] Toroid Problems
Thanks for the responses. I did however try a breakout point, but it
was only with a 2" nail. Maybe I'll try a bigger one. I don't have
the luxury of a variac (they seem too expensive), so I guess I'll just
run it at full strength despite the risks. However, will my
performance suffer if my capacitor is too big? Also, could this issue
have anything to do with the height of the toroid?
Nicholas Goble
DC Cox wrote:
>while tuning, be sure to extend your sharp rod breakout point well
beyond
>the toroid's field control area --- usually 2-3 inches for this type of
>toroid.
>use a variac until you are the right tap point with streamers hitting a
>grounded pole or wire.
>sometimes, if the toroid is too large, there will not be a breakout as
the
>toroid itself surpresses breakout.
>
>Dr. Resonance
>
>
>
>
>
>On Mon, Aug 4, 2008 at 2:30 PM, 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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>> >
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