Re: [TCML] tesla coil did not work

[bartb <bartb@xxxxxxxxxxxxxxxx>]

There is no way to tell if you put a .03uF cap on there that the coil 
would be in tune. The circuit I described however is how most spark gap 
coils are connected. Without changing the sec or pri coils, then you 
will need to adjust the capacitance. Use javatc to help determine the 
sec and pri coil parameters and also with what cap size is needed for 
the coils to be resonant. http://www.classictesla.com/java/javatc.html

Take care,
Bart

tuna ayan wrote:
> we set the circuit with .025uF and increased spark length then we saw a
> continuous yet tiny spark on the toroid's output. electrical fuse of
> building was broken. we want to avoid of breaking fuse and increase arc
> lengths  on toroid's output. we must not change primary coil and secodary
> coil. what is our chance? if we set the circuit for your recommendations, is
> it work for these problems? thanks for your regarding.
>
> On 2 September 2010 04:09, bartb <bartb@xxxxxxxxxxxxxxxx> wrote:
>
>   
> > Your hypothetical calculation of 450kHz is way off. The 170kHz makes sense
> > with say a 12cm x 48cm toroid in place or near that size. Your primary
> > however is tuned to about 70kHz. Reducing the tank cap size to about .03uF
> > would be a good place to start. Regarding your schematic. I don't understand
> > the gap next to the resonator. Move your tank cap and put it in series with
> > the primary (right where that 2nd gap is located) and lose the 2nd gap. Even
> > then, the whole resonator is completely out of tune and much work is needed.
> > I recommend using Javatc or similar program so you know what to expect with
> > all the LC components.
> >
> > Take care,
> > Bart
> >
> > tuna ayan wrote:
> >
> >     
> > > primary coil: 8 turn, smallest radius 11cm, largest radius is 19cm.
> > > secondary coil: ~1250 turn, radius 6cm.
> > > primary capacitance : 0.16 uF
> > > HV transformator : 5kv 250mA
> > >
> > > our circuit design:
> > > http://img176.imageshack.us/img176/3343/37331903.png
> > >
> > > when we operated the circuit only spark gap worked properly. secondary
> > > coil
> > > did not work since we did not observe any arcs at toroid.
> > >
> > > We suspect that this failure was because of unmatched frequencies. We have
> > > hypotetically calculated our resonant frequency as 450 kHz, however when
> > > we
> > > applied a sinusoidal wave to the primary coil, we have seen a similar
> > > sinusoidal only at 170 kHz. What do you suggest us to match those
> > > frequencies and what else might be the reasons for the setback. Thanks.
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