A tragic coil
From: Atle Jorstad [SMTP:anjorsta-at-online.no]
Sent: Tuesday, February 17, 1998 11:56 AM
To: Tesla List
Subject: Re: A tragic coil
At 08:22 AM 2/17/98 -0600, you wrote:
>From: MARK [SMTP:moyson-at-tig-dot-com.au]
>Sent: Tuesday, February 17, 1998 4:56 PM
>To: Tesla List
>Subject: A tragic coil
>I have just made a new coil from left over materials. DISASTER..... no spark
>from the secondary and the capacitor keeps exploding. I cant find the problem.
>Here are its specs.
>Powered by a car battery and ignition coil about 10Kv output.
>A static spark gap in series with the primary of 7 turns (.5 inch spacing
>between turns) of uninsulated copper wire .8mm diameter
>A capacitor 630v .01uf in parallel with primary behind the spark gap (next
>A very old secondary (already wound by someone else) uninsulated copper wire
>3.2" diameter and 20"tall... 168 turns spaced by 5mm.PVC pipe type.
>Disharge terminal is just a sheet of aluminium ( for the moment)
>Although this is a poor set up (put together in 15 mins with leftover junk
>from other coils) I have never had results this bad. I am not prepared to
>canibalize my other coils but am prepared to buy a few key items (not too
>What should I do ??????????? All sugestions welcome.
Maybe the ign. coil voltage has some 30 kv transients, and that these
destroys the cap (but then the cap should explode, just break down!) , 10 kv
in an ign. coil sounds little to me.