RE: [TCML] tesla coil did not work

["Dave Halliday" <dh@xxxxxxxxxxxxxx>]

Hi Tuna 

Bart's suggestion to use JavaTC is a good one -- you can find it here:

http://www.classictesla.com/java/javatc.html

It is an online calculator. Plug in the physical parameters of your coil and
it will give you the component values. Play with it for a while.

As for your comment: "we must not change primary coil and secondary coil"

You may have to for it to work. Keep the Secondary coil as is, run those
parameters through JavaTC and see what your Primary needs to be.

This is not a matter of tossing a couple of coils and capacitors together --
a Tesla Coil is a very carefully tuned dynamic system and if one -- just one
-- aspect of it is out of tune with everything else, the Tesla Coil will
deliver miserable performance.

Do not be discouraged, use JavaTC and get it running.

Dave

> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx 
> [mailto:tesla-bounces@xxxxxxxxxx] On Behalf Of tuna ayan
> Sent: Thursday, September 02, 2010 12:59 AM
> To: Tesla Coil Mailing List
> Subject: Re: [TCML] tesla coil did not work
> 
> 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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> >>
> >>
> >>
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