RE: DC tesla coil

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Loudner, Godfrey by way of Terry Fritz <twftesla-at-qwest-dot-net>" <gloudner-at-SINTE.EDU>

Hi Kamil

A DC tesla coil is simply one powered by DC pulses. Otherwise the design of
the tesla coil is the same as usual. A simple design of a voltage doubler
can be found http://hot-streamer-dot-com under Greg's garage. But you would have
to scale up the ratings of the components. If your homebrew transformer is
already putting out 13KV/300MA, then I would not brother making a voltage
multiplier circuit. You already have plenty of power for a good tesla coil.
Put the transformer under a non-detergent motor oil, or even better
transformer oil. This will greatly aid in insulation and heat sinking. If
you use a matching capacitor, you can control excessive voltage coming from
resonant rise by correctly setting safety gaps across the high side of your
transformer. My hat is off to you for making your own HV transformer. Using
a DC pulsed power supply does aid in preventing HV kickbacks to your
transformer, but you would have to use diodes with a very high voltage
rating of 100,000V or more. These type of diodes are difficult to located
and are very expensive. The only place I have found them is from rectified
x-ray transformers. 

Godfrey Loudner  


> -----Original Message-----
> From:	Tesla list [SMTP:tesla-at-pupman-dot-com]
> Sent:	Wednesday, June 06, 2001 5:53 PM
> To:	tesla-at-pupman-dot-com
> Subject:	DC tesla coil
> 
> Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <tcmail-at-poczta.fm>
> 
> Hi!
> 
> Im looking for information and construction hints about DC Tesla Coils. If
> You have any information, or you know where can I find it please let me
> know. Aspecially I'm looking for materials about DC tesla coil
> construction
> and voltage multipliers construction. I know only basic things about
> voltage multipliers (how the voltage is multiplied), but I don't know for
> example how to count capacitor values, what is the time of loading
> capacitor from multiplier output? etc. I'm intrested in using multipliers
> in TC's because resonant rise effect causes transformer damages. I make my
> transformers on my own (they are too expensive for me), but I cant make
> transformer making very high voltage, because I have only an iron core
> which is designed for low voltage. It's a big core (48 cm^2), but windows
> for windings are small (there is no much place for isolation). The highest
> voltage I have made was 13kV 300mA (it was getting hot(windings wire was
> thinner than it should be) while working, but i thought to put it in an
> oil, or to limit current). There was no much isolation so i couldn't use
> resonant rise effect. Also I think, that using voltage multiplier makes me
> able to load any size of capacitor (also bigger than resonnant) to high
> voltage (higher than produces my transformer). What do You think about
> using voltage multiplier? Please send me any information about multipliers
> that You have. 
> 
> Kamil Kompa
> 
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