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Re: Help with analyzation theory



Original poster: "Harold Weiss" <hweiss@xxxxxxxxxx>

Hi Adam,

Simply put, when the spark gap fires, it is a very low resistance similar to a short circuit. The voltage drops to almost nothing and the current skyrockets.

When the tank capacitor is charging, it is following the 60Hz waveform, but when the gap fires the waveform abruptly drops. This sudden drop produces much higher frequencies. It is the same reason SCR dimmers make so much RF noise every time they start conducting. The cap and primary work together to select one frequency out of the noise, which is the tunning of our coil.

Hope that wasn't too technical. As far as math goes, I can't keep any formula other than Ohm's/Watt's law in my head long enough to use it. Damn autism.

David E Weiss



Original poster: "Adam R." <arabraxas@xxxxxxxxxxx>

I've been working with coils for awhile now, but am still just a beginner's student in EE and am working to understand the circuit of the coil, but am running into some bumps in the road so I am wondering if someone can point me in the right direction. For brevity's sake, I won't rattle off too much off what I'm stuck on. I'm just asking the "whys?" of what is going on.

First, I don't quite understand how the i(t)=C(dv/dt) can get so high (ie hundreds of amps). I also don't fully understand the nature of the 60hz to high frequency tank circuit.

What's throwing me off is how I'm looking at the circuit in the manner of an LC, the cap/indu reactance, and etc., I'm trying to piece things together, but they don't seem to fit, especially when I add the spark gap. The math equations keep forming odd numbers, such as 13269 amps! I'm not trying derive everything, but just again, see how things (mathematically) fit together.

I don't want the theory "spoon fed" to me, just if someone could start pointing me in the right direction as to what I should research. Thanks in advance!