[TCML] Re: FreakySpeaker mk1 (Newbie Questions & the pics I
freeekyg at gmail.com
Fri Sep 12 19:43:12 MDT 2008
Just did a superficial search in the archives for anyone else who may
have used a speaker as a base for a TC but I didn't see anything!
So as a "prompt" for comments *g* ....
I was wondering wether or not the casing of the speaker and/or LARGE
magnet (all at RF earth) being so close to and directly below the coil
could be excessively "sucking" energy from my system and if it was, if
there was any way around that while still allowing me to use the
I recall reading somwhere that a strike rail should not go all the way
around so as not to create a ground loop. With this in mind I did cut
a section out of the top of the casing but am unsure of how effective
that may in fact be considering the rest of the structure not to
mention the magnet itself!?!?!?!
I run a small nightclub (which doubles as my "lab") thus the reason
for my "theme"! I also happen to have a large 18" speaker (also blown)
with a very solid "cast" casing which is extremely visually appealing
and which I wanted to use as the base for my 3.5" coil, but not if
it's going to be counterproductive with regards to the output of the
All the best
Randburg, South Africa
2008/9/11 Grant Visser <freeekyg at gmail.com>:
> Hi again!
> Figured some pics would probably fare better than me trying to
> describe what I have done so I finally dragged myself away from
> "experimenting" and got the pics uploaded!
> FreakySpeaker mk1 completed unit is here ->
> The other pics including the construction and some SPARKS are here ->
> For the record, my coil cost a grand total of US$3.50 ... I really
> meant it when I said that I had SCROUNGED the parts! *GRIN*
> I know it's a baby but I would REALLY appreciate any and all input and
> comments from you GURUS!
> Even with my new smooth torroid top load and a single sharp breakout
> point the best I have been able to get is 18cm sparks so my main
> question is really wether I am getting what you would expect (all
> things considered) or am I losing power somewhere?
> Because it is my first coil I would REALLY like to get it operating
> OPTIMALLY before I move onto my next one which is going to be this
> one's 3.5" bigger brother!
> This one's specs are:
> Driven by a single 7.5KV 30mA NST from 220V 50HZ, centre tapped.
> Double adjustable spark gap quenched with air suction
> Leyden Jar Main Capacitor of unsure value (Variance in possible k
> gives somthing between 14.77 and 27.1nF)
> Yet to obtain and add the Power Factor Correction Capacitor (110.98pF)
> Two air core chokes (32 turns of 11mm coated copper wire on 44mm pvc forms)
> Secondary PVC form OD is 50mm (1.9685")
> Secondary coiling is 620 turns of 0.588mm coated copper wire (43.6118
> turns per inch achieved), coiled length is 38cm (after I cut the form
> down from it's original 49cm!!!
> Primary winding is 7 turns of 1.1mm copper house wire uncoated, inner
> diam is 9cm, outer is 18cm, at a gradient of approx 30 degrees
> Torroid Top Load is 11cm tube diam and 52cm total diam
> With this top load my best performance tap point is at 4 turns exactly.
> The 18cm spark was achieved with trial and error tuning of the primary
> tap and adjusting the spark gap.
> Many many thanks in advance
> Grant aka FreakyG
> Randburg, South Africa (Actively seeking other South African coilers!!!)
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