Re: Kicker Coil Powered TC

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

Original poster: "davep by way of Terry Fritz <twftesla-at-qwest-dot-net>" <davep-at-quik-dot-com>

Tesla list wrote:
 
> Original poster: "Kevin Ottalini by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <ottalini-at-mindspring-dot-com>

> Steve:
>     The Science First coil is a kicker coil ... in fact the same as the
> Edmund small coil since Science sells to Edmunds.

> This coil has a conical secondary, with a single wire turn primary
> which is powered off a small induction coil run on 120VAC.

> The resonant frequency is quite high,  perhaps 2MHz or more ...
> I haven't measured it, but I will.
 
> All in all I was quite disappointed in the performance.
 
> Anyone can take a relay with at least one NC contact and wire the
> coil through the NC contact to make an induction coil.  The voltage
> will be built up across the coil itself (as the field collapses), and
> can be quite dangerous!

	...and may or may not be decoupled from the 60Hz line:
	If not isolated....
 
> I built one of these when I was 13 or so running off a 9V battery
> (I still have it ... I'll take some pics).  I used old CB antennas as
> electrodes.  It will totally lock up all the muscles in both arms
> and hands such that it  is impossible to let go!

	I shan't tell how I achieved that state, at a similar age.
 
> Just imagine what one powered off wall current would do.
 
> Everyone, please be careful with these ... they look simple and
> not very dangerous but they are quite deceptive and can be lethal.

	Indeed. 

> ----- Original Message -----
> From: "Tesla list" <tesla-at-pupman-dot-com>
> To: <tesla-at-pupman-dot-com>
> Sent: Tuesday, January 15, 2002 11:07 PM
> Subject: Kicker Coil Powered TC
> 
> > Original poster: "S & J Young by way of Terry Fritz
>><twftesla-at-qwest-dot-net>" <youngs-at-konnections-dot-net>

> > Hi List,

> > Just wondering if anyone has built their own kicker coil powered
>>small TC, similar to those sold by Edmund Scientific.  If so, please
>>share your design and results.  (A kicker coil is sort-of a one
>>winding induction coil which relies on the collapsing magnetic field
>>to generate perhaps 1 KV impulses.  It was more common in the early
>>1900s.)

	An informal term for the 'Induction coil' mentioned here
	recently.  Used in 'quack' medical devices.  and some
	auto ignition coils.  Used a t model coil in my first
	coil, at a tender age.  Tesla used induction coils in
	some of his early work.
   
>> Seems like one could make a kicker coil by using 120 VAC relay with
>> normally closed contacts.

> > A kicker coil powered TC should be a fairly safe introduction to TCs

	errrrrrrrrrrr.

	There is no 'dc/60 Hz' isolation between the line and the output.
	(as opposed to an induction coil, or similar.)  The 'low'
	side instead of ar e relatively benign 9/12/24 v range is hot off
	the AC line.  Treat with at least as much respect as any other
	live wire.

>> as no HV transformers are involved.  One should be able to produce
>> "streamerettes" a couple inches long.

	probably.  Be aware of the risk, please...
	
> > For those interested in this, get a book from Lindsey Publications
>> called "High Frequency Apparatus" by Thomas Stanley Curtis, originally
>>published in 1916.  It has a chapter on kicking coil apparatus.

	best
	dwp