Re: Herrick's Transformerless Tesla Coil

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

Original poster: "K. C. Herrick" <kchdlh-at-juno-dot-com> 

If Terry will post http://hot-streamer-dot-com/temp/TSPK17A2.PDF, it will
show exactly what I have in mind--and am starting on.  Ref.
http://hot-streamer-dot-com/temp/tspk17s1.pdf. and
http://hot-streamer-dot-com/temp/tspk17a1.pdf (the latter now modified).  I
would anticipate that primary resistance will be very low with this
design.  With inductance in the area of 1/2-3/4 uH, the reactance will be
low, too, at 100 or 140 KHz depending on which secondary I use.  Also, I
found a very nice charging choke: 2.5 mH with only 3/4 ohm resistance, so
I may well get >450 V on each capacitor group during resonant charging.
(Cost me only $5 + a trip to the surplus store, I'm pleased to say.)

In the -17A2 dwg, the 1/5 hp dc motor mounts at the center, driving the
commutating rotor which mounts the 5/32" x 7" tungsten gap-rod.  Twice
per turn, the 6 capacitor groups are sequentially resonantly-charged via
the commutator, then (resonantly-)discharged in series via the spark gap.
  The primary "coil" is merely the 7, 3/4"-dia copper pipes + all the
capacitors' inductances, arrayed as 1 turn, concentrically, on the 12-17"
diameter.  The capacitance ends up being 1/6 x 14 x 2 uF = 4.67
uF--charged to upwards of 6 x 500 V.

Comments welcome.  Just need to get the lead out now...

Ken Herrick