Another first coil story
Subject: Another first coil story
Date: Wed, 4 Jun 1997 22:02:55, -0500
From: RSNV02D-at-prodigy-dot-com ( MATT MCARTHUR)
I have been silently watching this list for a month or so now and I
just completed my first coil. I am having a few problems with it
though. The main thing is that I am only getting a weak little
6" (thats inch) spark, if that. As far as I can tell I have achieved
I think, since I only get the 6" spark when the primary is in the
perfect spot (tuned).
The setup I have is a 10KV 23mA OBIT tranny, 5 1.2nF salt water
beer bottle caps ( I built a plate glass cap but roasted it due to
design) 2 series gaps with .020 inches gap each. My primary is made
out of 1/4 inch copper tubing, 7" diameter, 5" tall. The secondary is
3 1/2" PVC pipe, approx 12 1/4" long with about 500 windings of .025"
enameled wire. The output terminal is pretty cheap, it is a 60 watt
light bulb (5" in diameter) covered with aluminum foil.
The best guess I have to the wimpy sparks is bad coupling. The
secondary sits about one inch from the BOTTOM of the primary. I had
just read a post that said something about the secondary for lower
coils being 1 1/2" ABOVE the primary to enhance the coupling.
Could somebody please put me back on track!?!?!?