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Re: Dual MOT plans - PIRANHA

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.