Rotary Spark Gap Design
[NOTE: The gif file will be sent to those on the image sub-list. If you are on
the list and do not get the image, let me know.
-- Chip ]
I've attached a gif file (Sparkgp2.gif) schematic of my rotating spark
The original design was taken from Bill Wysock's
3.5MV Super Model 9 Tesla Coil.
We have this coil in our National Science and Technology Centre
(Questacon), Canberra Australia.
Very impressive too!
Power Supply - 20KV -at- 12.5KVA
Current and Voltage Limited by variacs of some kind.
2 x 0.1uF Caps in series = 0.2uF -at- 50KVDC each.
Rotating Spark Gap (see GIF file)
Primary - 5 turns 1/2" copper pipe, archimedes flat spiral
Outside Diameter - roughly 28" - 29"
Inside Diameter - 2" larger than secondary, ie, 1" spacing
between primary and secondary.
Secondary - 800 Turns of 3mm (appears plastic insulated)
Diameter - roughly 15"- 18"
30" x 10" professionally made Alluminium toroid
Frequency - 80Khz
Output - 3.5MV (at full power)
Spark Lengths - roughly on average 6-10 feet.
The template on the coil and power supply says -
The UHV Division of Proffesional Sound Systems.
(I don't know if it exists, or under a different name)
This coil is inside a cage, yet my friend works at the organization, and
were allowed inside for a closer look, therefore the measurements are
mostly from observational point of view, as I forgot my tape measure that
day, yet the error would be +/- 1" on dimensions except toroid.
Unfortunately, no matter how much we begged, they wouldn't let us be
inside the cage during operation - standing at least 5 metres away behind
a fixture. The decibel reading in the cage is around 100dB.
BTW, we're crazy HV guru's and love the thrill of standing close to
coils, but we're still living, and haven't been struck....yet! :-)
Hope the design can help others, and that Bill doesn't mind...
Hi Bill! :-)