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potential gain vs. power in TC systems

Original poster: "D.C. Cox" <resonance@xxxxxxxxxx>
Keep in mind that output voltage is no indicator of spark length. Spark length is a function of power input and pulses/sec off the HV terminal. It is a plasma corona "growing" effect and that's why using strict voltage calculations to produce long sparks isn't that relevant in Tesla transformers.
Most systems respond favorably with a 1,400 to 1,600 turn closewound secondary inductor running with NST power supplies. Systems with pole xmfrs work favorably with a 1,000 to 1,200 turn sec. inductor. Tesla coils like a lot of "power" for good spark output. John Freau's equation works well to predict this behavior.
System Q factor which is normally critical for switching circuit applications is not that important in Tesla coils --- at least not as important as a lot of power in the system.
Richard Hull's record of spark length = 13 x secondary inductor length was achieved driving a 4 inch dia. coil which featured over 1,000 turns of fine stranded closewound enamel magnet wire, I believe it was around #28 or # 30 AWG. A very tiny sec coil closewound delivering 11-12 ft long sparks!! It was amazing to see in operation. 

Dr. Resonance





Original poster: "Qndre Qndre" <qndre_encrypt@xxxxxxxxxxx>

Hello Adriano,
no, bigger coils don't mean longer sparks. The voltage gain for coupled resonant circuits which are tuned to the same resonant frequency is the ratio of secondary capacitance to primary capacitance. The resonant frequency of the LC circuit formed by the resonator coil and the coil's self capacitance must match the frequency of the driver circuit so that the reactances are cancelling out each other resulting in maximum current flow. A coil with many thousands of turns which is completely out of tune will not produce any visible output. If the driver is self-adjusting you can chose the resonant frequency to be whichever value you want it to be and design a secondary for it. The smaller the resonator's capacitance, the higher the output voltage. Remember that simply decreasing the capacitance will result in a change of the resonant frequency as well which has to be compensated by increasing the inductance especially for a fixed-frequency driver circuit. 

Regards, Q.

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Subject: arc lamp starter
Date: Sat, 01 Apr 2006 13:22:36 -0700
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Original poster: Adriano.Mollica@xxxxxxxxxxx


hi list!
i found in the junk an curious old device. it says " arc lamps starter". it is very old, i think 40 or 50 years old . 
i took it and open it. inside i found a little nice tesla coil.
It is a real spinterometric tesla coil, the strange is the secondary coil size. the wire diameter is very big than usuall, almost 1 millimeter diameter. this machine is able to produce arc between grounded object and the upper terminal of about 5 cm. But not free sparks in the air So i changed the secondary coil with one i did before, and it work better, now i can see a small corona. which is the rules for building a secondary? bigger is better? i mean , i would emprove this machine, so how? 

thanks!