Re: Coil costs $0.00? and $,$$$,$$$+++?

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

Original poster: "David Sharpe by way of Terry Fritz <twftesla-at-qwest-dot-net>" <sccr4us-at-erols-dot-com>

Will do Terry!  Also several additional details...

http://hot-streamer-dot-com/temp/Tcoilexp.xls

1.  Got my FET's for the SSVariac project.  55V, 104A (IRF
     PN IRL2505).  Will have to make a double sided custom
     straddle clamp heatsink to support and allow busbar connections.
     Also downloaded a "very"  high speed optocoupler driver
     for unit from IR website.  Circuit will switch on or off in <1 usec!!!
2.  Neat new power IGBT's out.  In this months Electronics Products
     IR has several devices which are turning off in <0.3usec!!! and
     these are not chump <1A pieces either, 7.5hp (kVA) at 1.2kV.
     IRGPS60B120KD is optimized for 25kHz hard switch and
     IRGPS40B120UD is optimized for 50kHz hard switch.  Both
     devices super TO-247 Co-packs. ($8.32/10k available now).
3.  Project work has been very slow around here in the fall with
     my son playing college football and helping my wife with her
     chemo treatments.  Long term prognosis is good, just one more
     treatment.  Got a new vehicle to go tail-gating and long travel
     tho... traded my 95 conversion van in on an '01 Suburban.  Couldn't
     pass up 2.9% financing for 60 months... :^).  Comfy on long trips,
     and gas mileage for such a large vehicle is awesome (18+)!!!
4.  Got the urge to build a really small TC using a 5kV 60mA NST
     Will probably build 304TL coil with my other comrade-in-arms
     "ex-student".

Regards
Dave Sharpe, TCBOR
Chesterfield, VA USA

Terry Fritz wrote:

> Hi Dave,
>
> Could you please resend the file attachment to:
>
> terry-at-hot-streamer-dot-com
>
> Attachments sent to the Tesla list are now automatically destroyed to fight
> viruses.  My special virus scanner kills them all ;-))
>
> Cheers,
>
>         Terry
>
> At 09:29 PM 11/19/2001 -0500, you wrote:
> >Terry
> >This thread got the gray material moving...
> >
> >Attached is cost breakout (August 1997) for a 1kVA magnifier
> >that a co-workers son and I built for a High School Physics project.
> >11kVA radar transformer, HDPE flat plate caps in Tesla Equidrive
> >configuration, 6 point biphase super-series rotary.  Max spark length
> >observed was ~40-46" caught on still photograph.  Gap needs to be
> >rebuilt using brass and carbon steel electrodes versus stainless
> >steel (learned alot since those days...  :^(   ).  The student who
> >helped me build this is now a MS in physics, and works with
> >me (in another R&D work group) so is now a colleague.   We are
> >in early design stages of a high power VTTC using 4 304TL's in
> >push-pull parallel.  Total out of pocket cost was <$500, but if
> >you include market cost for fiberglass components, nylon hardware,
> >wire, etc.etc cost would probably be closer to $650-700.
> >
> >OBTW, the flat plate, oil immersed HDPE caps have worked fine at up to
> >1.5kVA input, and have never exhibited corona or other leakage
> >problems.  If 11kV drops to ~10kV under load, each cap in equidrive
> >is seeing about 5kV.  Also notice that capacitors are (were) the single
> >most expensive component in the coil (~45% of total cost).
> >
> >Regards
> >Dave Sharpe, TCBOR
> >Chesterfield, VA. USA
> >
> >Tesla list wrote:
> >
> >> Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>
> >>
> >> Hi All,
> >>
> >> I was just wondering...
> >>
> >> I know many have made coils for very little money and, of course, you can
> >> spend tons of cash on them too.  However, has anyone ever made a coil that
> >> they didn't buy anything for?  I mean, you found all the parts and
such for
> >> free and didn't even buy glue or buy anything on it.  In other words, a
> >> truly "free" coil?
> >>
> >> I think all the coils I have heard of required "something" to be
purchased.
> >>  It would almost be a fun project to try and make a coil truly for free...
> >> Not even buying solder or anything.  Then we can truly say Tesla coils can
> >> be made for "nothing".
> >>
> >> In the same light, anyone care to "reveal" how much they have spent on the
> >> most expensive coil?  I imagine some of the "pro" coils are up in the
> >> $10,000 plus plus range...  I realize the cost of pro coils like the Model
> >> 13 and the Electrum may be "secret" and the real cost may be a little hard
> >> to determine, but I was just curious who had the "World's Most Expensive
> >> Tesla Coil"...
> >>
> >> Cheers,
> >>
> >>         Terry
> >