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Re: Another "My First Coil" story.
Subject: Re: Another "My First Coil" story.
Date: Wed, 28 May 1997 21:21:09 +1000
From: Peter Electric <elekessy-at-macquarie.matra-dot-com.au>
To: tesla List <tesla-at-pupman-dot-com>
References:
1
Tesla List wrote:
>
> Subject: Another "My First Coil" story.
> Date: Mon, 26 May 1997 22:30:54 +1000
> From: Phil Chalk <philoc-at-ozemail-dot-com.au>
> Organization: Secure_Logic
> To: tesla-at-pupman-dot-com
>
> Greetings all,
>
> I've finally joined the ranks of those that've actually built one,
> throwing sparks ! But........
>
Snip>
> With a 6" copper sphere (toilet cistern float) on top, it tunes at about
> turn 7, and throws the odd spark from the centre rib - sometimes. If I
> put a pin on the sphere it throws sparks from there, but no longer -
> perhaps shorter - than without the sphere. A roughly hemispherical spun
> aluminium 'wok lid' about 12" diameter throws many short (<= 1") sparks
> from the rim.
>
>
> Phil Chalk.
I have also got a relatively "skinny" coil at 3.5" by 21" and I found
much the same thing, i.e. I got only slightly longer sparks from an 8"
sphere (glass lampshade with foil) than I got from the bare bolt. My
coil also tuned around 5 to 6 turns.
When I fitted it with a 18" by 10" inch toroid, also a Al covered
lampshade, (I'm right into lampshades) the coil tuned out at 8 turns and
really came to life - I got 30" sparks. I'm pretty new at this but IMO
you seem to get longer sparks the lower you can get the freq of the
coil. I think the guys with 6" or larger secondaries have an advantage
here.
Try the toroid and see how you go.
Peter E.