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Re: Tuning an OLTC ... basics ...
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- Subject: Re: Tuning an OLTC ... basics ...
- From: "Tesla list" <tesla@xxxxxxxxxx>
- Date: Mon, 25 Apr 2005 09:22:05 -0600
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Original poster: Davetracer@xxxxxxx
I have an old fashioned, spark gap Tesla Coil ...
I wandered by WinTesla and the Java calculators. Here's the bare bones:
12,000 volts, 60 ma, which would like a cap of 0.0135 (13.5 nf) for Z match.
Primary winding is what you'd expect, 10 turns, flat. The primary will go
"twanggg" at 240 Khz if I hang a 0.0241 mfd (24.1 nf) cap on it.
Secondary is 12.5 inches of #25 wire, for 589 feet. 3.5" diameter.
1/4 wave length is 354 feet, which makes me wonder if they calculated it
H/D aspect is 3.57 and likely number of turns is 643.
The secondary would like to twang at 693.72 khz, except if I put a toroid
which will bring it down to 240.40 khz, which will match the primary.
A couple questions:
How far do you generally have to move the primary "clip" to get an effect?
A quarter turn? An eighth?
I'm running with tinfoil on plastic now for caps and clearly don't have
enough capacitance. My 'scope shows a strong frequency being emitted around
800 Khz, with all sorts of lovely harmonics. Is it getting time to string
up some MMC's? Or should I go beer bottles (grin)!
I do have a scope, can I use it to help me tune this puppy in? I do not
have a signal generator, alas, and although I hear rumours that there are
directions in how to build one from some 555 timers somewhere, I have not
yet found that!
Do you think I should load this into my Jeep and drive up to Terry's and
shamelessly offer him a bribe?
Many thanks for helping this relative newbie,