[Prev][Next][Index][Thread]
Re: Need Help.
James wrote:
> Original Poster: "James" <elgersmad-at-email.msn-dot-com>
>
>
> Don't touch your coil, but if you can get some high voltage rectifier
> tubes you could very easily build a bridge rectifier that you could rely on,
> and then you could use V/I from the output of the neon transformer to find
> the output impeadance after the retifier, or at present for the AC value.
> Then you would need to find the average voltage, and current output using
> 2(Vpeak)/pi = Vave, defined as the average voltage, then you work the
> equation for impedance. It's not a true AC output to the Tesla coil using
> the rectifier, but when you replace R in the equation F = R(C)(2)(pi) you
> can equate the frequency of the spark gaps output by multiplying that value
> of Capacitance by five. Reversing the equation gives you the value of
> capacitance that you'll need. So, since you have R which is equal to the
> impedance of the output of the neon transformer, the Frequency=F, and the
> constant pi, you can reverse the order of the equation. Therefore, C = ((F
> the desired frequency)/2(pi)R).
>
> In typical circuits a capacitor only charges to 1/5th of the maximum
> voltage.
???? Please explain.
> So, the time that a capactitor would require to discharge an arc
> is 5 times longer, so when finding the value of Capacitance you would need
> for this circuit using the equation above you would need to then Divide it's
> calculated value by 5 to be discharging through the spark at your peak
> voltage. You would need to work all of the equations to check if your not
> using something else that's automated. You would need something for
> calculating a spark gap using capacitors specifically, not just the coil's
> resonant frequency..
????? A worked example would be helpful.
Malcolm
> James.
>
> .
>
>
> >Original Poster: "Gregory R. Hunter" <ghunter-at-enterprise-dot-net>
> >
> >Dear Unknown Coiler,
> >
> >Is your spark gap firing at all? If it is, you should get a little bit of
> >spark even if your coil is way out of tune. Put a top terminal (toroid,
> >coffee can, metal salad bowl, etc.) on the thing and tape a pin or
> >thumbtack on it with the point sticking up. Darken the room. Try each
> >primary turn, one by one, until you see some corona on the pin point, then
> >fine tune for longest spark. If you never get any corona, change your
> >capacitance value & repeat the process.
<snip>