Re: 20 joules at 100 bps vs 4 joules at 500 bps

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Steve Ward <steve.ward@xxxxxxxxx>

Hi Dave,

There are other possibilities for driving big coils.  Just a few
considerations necessary for successful DRSSTC operation.  First,
lower operating frequencies are better, preferably in the 30-40khz
range.  Secondly, the tank capacitor for the primary for a 16 foot
spark system might be as much as .5uF.  For 20 feet it might take 1uF.
 It would have to handle maybe 3000A pk, and maybe up to 200A RMS (but
i havent done any real calculations yet, just estimates).  So the
requirements are just a little different than that of a spark gap
coil.

See you in september?

Steve

On 7/18/05, Tesla list <tesla@xxxxxxxxxx> wrote:
> Original poster: "Harold Weiss" <hweiss@xxxxxxxxxx>
>
> Hi Steve,
>
> I was going to ask you the same thing only with a 6-7' chunk of 15"
> PVC sewer pipe.
>
> David E Weiss
>
>
> >Original poster: Steve Ward <steve.ward@xxxxxxxxx>
> >Hi Mike,
> >
> >As to arcing to the power lines, i was really referring to the 240V
> >lines that run across our yard.  I wouldnt dare get close to a high
> >tension line!
> >
> >As to the giant coil, yes, the idea has come up several times.  Im in
> >the Chicago area, and there are some other coilers around here.  One
> >of them has a 2x8 foot secondary (currently in storage).  We have
> >talked about the idea of me building a driver for the giant coil.  He
> >has a friend with some land and something like a 200A service to a
> >barn, it would really be an ideal situation to attempt this.  I have
> >the CM600  IGBTs that Terry sent me some time ago, and i have actually
> >fabricated a bridge out of them.  The major problem is lack of time
> >(not particularly a problem for me, but for the other people who would
> >be involved).  Our hope would be for 16 foot streamers mimimum, but up
> >to 24 feet might be possible with a secondary of that size.  IGBT's
> >should not be a limiting factor ;-).  For a first go at it, i can
> >easily remove the drive electronics from my large DRSSTC.  Jimmy Hynes
> >thinks that my current bridge could handle driving a giant coil, but
> >im not quite as confident.  I do think that i could get 16 feet from
> >my existing driver, though.
> >
> >Maybe some day...
> >
> >Steve
> >
> > >