Re: Dual MOT plans - PIRANHA

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>

Something to note regarding the IGBT's, they've doubled in price (as 
of a couple months ago, I haven't checked recently). Check the part 
number (listed in Terry's info) for availability and price. It might 
be necessary to find a substitute near the designed values.

BTW, if anyone has found a substitute, please share the info.

Take care,
Bart

Tesla list wrote:

> Original poster: Terrell Fritz <terrellfone@xxxxxxxxxxxxxxxxxxxxxxx>
>
> Hi Dan,
>
> SISG's and PIRANHA class coils can run at any power level depending 
> on the number of SISG sections used.  It is about 6 inches of arc 
> multiplied by the number of sections minus the toroid radius.  So 
> one of Mark's SISG boards would be fine for say an 18 inch arc 
> coil.  You would need a small variac or one of  the solid state 
> variac boards Dr. R. mentions for control.  The basics of the SISG are here:
>
> http://drsstc.com/~sisg/files/SISG.pdf
>
> I never got further on "my" solid state variac thing.  I "think" 
> DC's needs a charging choke where mine would not.
>
> Most of the details are here:
>
> http://drsstc.com/~piranha/PIRANHA/PIRANHA-2/
>
> There are actually "three" versions of the PIRANHA.
>
> PIRANHA-I was the first demonstration coil:
>
> http://drsstc.com/~sisg/files/SISG-coil/P7150177.JPG
>
> http://drsstc.com/~sisg/files/SISG-coil/P7150179.JPG
>
> http://drsstc.com/~sisg/files/SISG-coil/P7150184.JPG
>
> http://drsstc.com/~sisg/files/SISG-coil/Scematic.gif
>
> http://drsstc.com/~sisg/files/SISG-coil/SmallSISG-2.gif
>
> It used a modified prototype 3 sections SISG experimental board:
>
> http://drsstc.com/~sisg/files/SISG-coil/SISG-Small.jpg
>
> http://drsstc.com/~sisg/files/SISG-coil/SmallSISGCoil.pdf
>
> It's a cool coil, but the giant resistor in it waists way too much 
> power.  Although it demonstrated and served as a prototype of the 
> concepts, the PIRANHA-I electrical design is really very obsolete 
> and I don't recommend it.  The physical coil is fine.  If it was not 
> for historical value, I would replace the electronics with PIRANHA-II
>
>
> PIRANHA-II uses the full PIRANHA charging system for very high 
> efficiency and is what you want to use:
>
> http://drsstc.com/~piranha/PIRANHA/PIRANHA-2/Complete-3.JPG
>
> http://drsstc.com/~piranha/PIRANHA/PIRANHA-2/
>
> http://drsstc.com/~piranha/PIRANHA/PIRANHA-SCH.gif
>
> http://drsstc.com/~piranha/PIRANHA/PIRANHA-2/PIRANHA-Const-006.JPG
>
> http://drsstc.com/~piranha/PIRANHA/PIRANHA.pdf
>
> http://drsstc.com/~piranha/PIRANHA/PIRANHA-Details.pdf
>
> You would just change it to use "one" of Mark's boards and it would 
> use a lower input voltage and current.  All the component values are 
> the same but the caps probably don't need very high current ratings 
> for just one board.  With its ball terminal toroid (which works 
> fine*) and PIRANHA-II electronics, it is probably one of the most 
> advanced Tesla coils on Earth (although the vastly more complex 
> DRSSTCs have more technology and "stuff", they don't work as well 
> ;-)  Finn's triggered single brick BRISG is a "stunningly" wonderful 
> machine too!!
>
> *Dave has made the biggest sparks off a ball terminal with his coil:
>
> http://hot-streamer.com/temp/DaveBaehr/b03_2862.jpg
>
>
> PIRANHA-III is a dual MOT 120VAC 20 AMP (single circuit :p ) coil 
> that would put out 8 foot arcs.  Although designed, it has not been 
> built yet.  PIRANHA-II scares me bad enough at "1/2 power" already =:O)
>
>
> Microwave parts can be bought new and at a great price from this 
> place if you don't want to shop at the junk yard:
>
> http://www.amiparts.com/consumer/catalogindex.htm
>
> The higher wattage MOTs are best since they do not have as much loss 
> and are fairly cheap at $55 to $65.  Those 16kV 750mA  AMI3347 diodes RULE!!
>
>
> Note that PIRANHA primary drive circuits are EXTREMELY dangerous!!!
> There is "NO current limiting on the HV"!!  Ballasting is done by 
> "magic"*.  Even pig systems are probably safer!!  PIRANHA-II's 
> primary circuits are totally enclosed and double insulated.  It does 
> not need cooling vents since it does not waist power.
>
> *I was hoping Conner would figure it out :O))  But only the computer 
> seems to know...
>
> Cheers,
>
>         Terry
>
>
> At 03:35 PM 2/12/2007, you wrote:
>
> > Original poster: "Daniel Kline" <daniel_kline@xxxxxxxxxxx>
> >
> > Hi Dr. R.
> > I would like to request a set of the dual-MOT plans mentioned below.
> > Would it be possible to run on one MOT for lowered output?
> > Thanks,
> > Dan K.
> >
> > Tesla list wrote:
> >
> > > Original poster: "resonance" <resonance@xxxxxxxxxxxx>
> > > The best route for an experimenter than can live with 7.5 to 8 ft 
> > > long sparks is our dual MOT design.  Matching dual MOTs can be 
> > > obtained direct from AMPI.com for $100 each and the SISG boards 
> > > are inexpensively available from Mark Dunn.  I give away the dual 
> > > MOT plans on off-list request.  It's a great coil, highly 
> > > portable, easy to set up, and most important --- I did the design 
> > > so it would operate from two separate 120 VAC circuits, each 
> > > circuit driving a single MOT at 16-18 Amps.  220 VAC not required 
> > > for 7.5 to 8 ft long sparks.