Re: Car igntion coil

From: 	Edward V. Phillips[SMTP:ed-at-alumni.caltech.edu]
Sent: 	Friday, August 29, 1997 4:09 PM
To: 	tesla-at-pupman-dot-com
Subject: 	Re:  Car igntion coil

"Hi this is my first post...
I'am an Italian coiler...I can't afford neon xfrm...in Italy a small 10 KV
10 mA
costss about 200$...so i decided to generate the HT for the primary of my
coil by two old car ignition coil...it's a strange way to obtain HV isn't
it?...Did anyone already tried it??? Any way it seems to not work as well
as i thought..."
	Your english is fine.  As for the matter of building Tesla
coils operated from automotive ignition coils, many of us have done
it with considerable succes.  The biggest discharge I have been
able to get here is a little over 10 cm, using a 12 volt ignition
coil at an input of about 12 watts.  Essentially the same coil, running
with a 14" diameter toroid made of 4" diameter ducting easily throws
24 inch sparks when excited with about 600 watts from a neon sign
transformer.  Use what you have and enjoy it!
	As for your low output, you didn't give us enough information
for anyone to make a useful comment.  One thought is that you are
perhaps using a capacitor which is "too large for the coil", by
which I mean that it doesn't get charged to a high enough voltage
by the coil.  In my case I use an 0.0047 mfd capacitor, which 
breaks down a spark gap with a spacing of about 2.5 mm.
Good luck,