RE: arc lamp starter

["Tesla list" <tesla@xxxxxxxxxx>]

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!