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RE: [TCML] Toroid Problems
Nicholas,
If I had to guess I would say adding your toroid threw your coil so badly out of tune that you ran out of primary. You might try adding some more tank capacitance and re-tuning, otherwise your power level may just not be quite enough for such a "large" toroid.
Scott Bogard.
> Date: Mon, 4 Aug 2008 12:37:56 -0500
> From: ngoble@xxxxxxx
> To: tesla@xxxxxxxxxx
> CC:
> 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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