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Re: Help for a "green coiler"
to: Roger
Your basic design is fine. Use a .005 MFD cap to start. A fixed series
sparkgap with 2 gaps and a small fan blowing thru them will work good. Use
a 6x2 or 8x2 toroid (dryer duct -- cover with alum foil). Use some old
scrap wire for a temporary 20 turn primary for testing -- tap as necessary
-- replace later with a better looking and more permanent primary. Off
each NST bushing run a 250 to 500 Ohm, 25 watt power resistor in series
with a small toroid wound with 3-5 turns of wire. Insulate the toroid on a
plastic rod so it's at least 4 inches off the mounting base. Use a variac
for initial testing and tuning -- keep power low until in tune. Total
(both gaps) spark gap setting (combined) is 0.200 max -- start with 0.125
for initial testing and tuning. Be sure to use a very good external ground
(not power line) for the bottom of sec coil. This data should get you 8-12
inch sparks right off without much further alterations. Later, try a 60 ma
xmfr and .01 MFD cap -- retune and you with add 50-75% to your spark
length.
DR.RESONANCE-at-next-wave-dot-net
----------
> From: Tesla List <tesla-at-pupman-dot-com>
> To: tesla-at-pupman-dot-com
> Subject: Help for a "green coiler"
> Date: Friday, September 25, 1998 5:25 PM
>
> Original Poster: Gorzney Roger D <GorzneyRogerD-at-JDCORP.deere-dot-com>
>
> Hi everyone,
>
> This is a first try for me to the list server. I REALLY appreciate such
a
> location for help!
>
> I'm VERY new at playing with TC's. Working with standard NST's I'm
> attempting to build a fairly simple TC for now. I have built one, using
> 15.000/30ma NST, air gap, and door knob caps. Coil was wrapped on 4" pvc
> pipe, approx. length 28". This is all pretty much by trial and error
> methods.
>
> Can anyone supply me with the BASICS to go by, and any suggestions for
good
> results, at moderate costs? Is it better to convert to DC? Any
suggested
> designs for rotory gaps? And last but not least, and maybe my biggest
> curiosity - how do I wind an RF choke to prevent "kickback" thru my NST
and
> house wiring??? This has happened and the result was a neat cut (of
laser
> quality) in the case of the power transistor on a nearby 12v power
supply!
> Thank God for protecting my computer which was near by also!!!
>
> ANY help to a "green horn" would be appreciated.
>
> Thanks in advance.
> Roger Gorzney
> JDHW - Electronics Lab
> ___________________
> 309-765-6049 voice
> 309-765-9049 fax
> 120-3202 pager
> hx28876-at-deere-dot-com
>