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Re: DC TC
Tesla List wrote:
>
> Subscriber: rhull-at-richmond.infi-dot-net Mon Feb 17 14:34:13 1997
> Date: Mon, 17 Feb 1997 07:53:16 -0500 (EST)
> From: richard hull <rhull-at-richmond.infi-dot-net>
> To: tesla-at-pupman-dot-com
> Subject: Re: DC TC
>
> At 04:25 PM 2/15/97 -0700, you wrote:
> >Subscriber: gweaver-at-earthlink-dot-net Sat Feb 15 15:43:29 1997
> >Date: Fri, 14 Feb 1997 20:43:14 -0800
> >From: Gary Weaver <gweaver-at-earthlink-dot-net>
> >To: tesla-at-pupman-dot-com
> >Subject: DC TC
> >
> >Has anyone built a DC powered Tesla Coil other than a tube type Tesla
> >Coil?
> >
> >A tube tesla coil is basically a pulsating DC Tesla Coil.
> >
> >A car ignition coil is DC and operates from points that open and close.
> >But it's not TC.
> >
> >I found an artical where someone built a large auto transformer that
> >produced 42" sparks from a battery power supply. It's not TC either.
> >
> >Many years ago I built a crude Tesla Coil using a DC power supply an 810
> >tube and a signal generator to drive the control grid.
> >
> >It seem to me if a DC power source could be pulsed at resonate frequency
> >it would work fine for a Tesla Coil.
> >
> >The next question is what is the best way to pulse a DC power supply
> >with out a tube? How about a DC power supply with an adjustable charge
> >rate for the capacitor bank. The discharge rate threw the spark gap
> >could be adjusted to find resonate frequency? The capacitors would have
> >to be sized correctly for the proper charge rate.
> >
> >With a Tesla Coils operating on a DC power supply it seem like the
> >toroid or sphere on top of the secondary would charge up in one polarity
> >like a Van De Graff generator. Would the Tesla Coil produce longer and
> >more powerful output sparks at resonate frequency from DC?
> >
> >For a TC operating on an AC 12K transformer the peak to peak voltage
> >swing would be 19,968.volts. For the DC power supply to be equal to the
> >AC example the DC supply would have to be 19,968. VDC.
> >
> >Assuming it would be possible to pulse the DC power supply without a
> >tube would the output sparks at the secondary be longer or more
> >powerful? The same?
> >
> >Gary Weaver
> >
> >Gary,
>
> All this was posted on this list over the Christmas period concerning my
> work with DC powered TCs using spark gaps.
>
> Spark gaps are one of the best ways to use DC in a TC. It is used exactly
> as in an AC system. DC power just allows one to get far form breaks per
> second and pour in a lot more energy. Greg Leyh's giant system is probably
> the best example of a really big DC system.
>
> Somehow I get the impression you want to fire the system at the resonant
> rate!!!! Sorry, can't be done with any real energy delivery per pulse
> (simple oscillator does this.) Also, the primary/secondary require a certain
> magnetic interaction time to achieve best operation for spark output.
>
> There is no way to determine the Tesla coil's output polarity of charge when
> producing long, hot sparks! It is always positive! This is not due to any
> possible application method, schema, winding direction, phasing or polarity
> of input power. It is a matter of arc dynamics and the rate of energy delivery.
>
> Richard Hull, TCBOR
This is basically what I was getting at when I ask this question. Maybe I
wasn't very clear when I ask the question. I figured a DC power supply would
discharge threw the spark gap just like an AC power supply. Tubes or diodes
can be used to make the DC. I didn't want to use a tube as an oscillator.
I figured the dischage rate threw the spark gap wouldn't matter just like in
an AC circuit. The primary coil will be operation on pulsed DC not AC. Just
like a car ingition coil.
I had the idea if you could fire the spark gap at resonate frequency the TC
would perform better. But thats not so.
I was thinking about building a DC power supply and comparing it to an AC
power supply of the same watt rating. I forgot one of the laws of physics.
You can get any more power out than you put in. 1000 watts of DC or AC will
still give the same output.
Gary Weaver