Re: Black Plastic

Subject:      Re: Black Plastic
       Date:  Sat, 07 Jun 1997 22:17:59 +1000
       From:  Phil Chalk <philoc-at-ozemail-dot-com.au>
Organization: Secure_Logic
         To:  Tesla List <tesla-at-pupman-dot-com>
 References:  1

G'day Peter

Nice to see another Aussie here.  I have wanted to use the same black
plastic, but have believed the hype.  I can't find the clear sheet that
I use in reasonable size/price thicker than 100um (4 mil).
Next time, then, I'll give it a go.

Yes, my first cap was a dry, rolled effort, on carpet in need of
vacuuming, catering foil & 2 sets of about 12 thicknesses of poly.  The
dielectric also included dust, dirt, cat hair, all types of human hair,
sundry vegetable matter & so on.  It was a major drama & turned me off
rolled caps.  It was just the day 1 cap to see what I could get out of
it ( you know the enthusiasm to see sparks as soon as you have acquired
all the components & have 2 coils wound )  I have no idea really what
the value was, but it allowed me to get sparks straight away. ( it had
44cm wide foil sheets overlapping each other at one end, but with the
other ends extending beyond the poly.  When its all rolled up, I twisted
all the excess foil at each end - it looks like a big joint - and made
the connections to these twisted foil ends.

When I unwound it later, as each layer unwound there was a fresh whiff
of ozone - It had only operated for a total of probably 1 minute.

P.S my "skinny coil" now has 2 x 15kV/30ma for 15kV 60ma & is a bit
healthier & noisier now.  I've been in Canberra for a week, back home
(Sydney) for weekend, then back to ACT for about 7 weeks.  So taking
coil & all the bits down with me for playing.  Hope it radiates a bit of
HEAT too - it's bloody COLD down there !!


Phil Chalk.

Tesla List wrote:
> >Subject:    Re: Looking for Coilers in my area!
> >      Date: Sat, 31 May 1997 21:26:07 +1000
> >      From: Peter Electric <elekessy-at-macquarie.matra-dot-com.au>
> >        To: Tesla List <tesla-at-pupman-dot-com>
> >References:           1
> <snip>
> >The experienced guys will probably shoot me down in flames but I made my
> >rolled cap out of black plastic sheet that is commonly used as a
> >condensation barrier under concrete slabs. It is dirt cheap,
> >Polyethylene (I think) and is .2 mm or about 8 mil thick so you need
> >Quite a few layers. I think from memory I used 5 layers between 4 plates
> >giving me two caps in series and a total of .015uF. Rolling the whole
> >lot up is a bit of a challenge but I have been running this in 20W40
> >engine oil with 15KV for several months now with no problems.
> >
> >Cheers,
> >
> >Peter E.
> >