Re: Mini OLTC is getting 9"

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

Original poster: "Terry Fritz" <teslalist-at-qwest-dot-net>

http://www.scopeboy-dot-com/tesla/oltcpics.html

Cheers,

         Terry


At 09:26 PM 3/15/2003 -0500, you wrote:
>Very nice output pictures of your OLTC Steve.  Do you have any pictures of
>your coil (close-ups) under normal lighting.  I'm curious to see what your
>actual arrangement looks like.
>Thanks
>
>The Captain
>
>
>
> > Hi guys,
> >
> > I just got my mini Off-Line Tesla Coil finished. Now that it has a proper
> > power supply, it runs at 1200bps and produces 9" hot arcs to ground. It's
> > been an interesting project and kind of ties in with what Dan "Captain
> > Corona" McCauley was saying about the SSTC hybrid thing. Current is free
> > but you pay for voltage etc.
> >
> > The OLTC is kind of crippled by being restricted to about 700V primary
> > voltage. You need a very large tank cap to get a reasonable bang size, so
> > you have to use a one-turn primary and also a secondary with low resonant
> > frequency, which means the secondary is physically large, so it has lots
>of
> > self-capacitance and therefore a low top voltage and poor streamer growth.
> > It also means the primary current is massive to the point that it isn't
> > free any more. My coil runs 900 amps peak and the IGBTs get pretty hot as
> > you would expect. They're probably about 60% efficient.
> >
> > I put some spark pics from the OLTC as well as a quicktime movie on my
>website:
> >
> > http://www.scopeboy-dot-com/tesla/t3sparks.html
> >
> > Steve C.
> >
> >
> >
> >
> >
> >