Re: First run 6.5" coil- odd results? (fwd)
You really need to haul your caps down to a local TV repair shop and have a
technician measure the capacitance so you know the total capacitance of your
system. This is very critical as it determines the proper size of toroid on
the sec coil.
Second, you need to run much higher current, ie, 60 mA on the primary side
with this larger size coil. 30 mA really isn't a good driver for this large
of secondary coil with proper toroid termination ---- and we can't begin to
determine that until you accurately measure you total primary capacitance.
A small TV repair shop, if not too busy, would probably do it for free if
you approach them properly. Be advised properly is definitely not late
Friday afternoon on a hot day just before a holiday weekend starts.
From: Tesla List <tesla-at-pupman-dot-com>
To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
Date: Sunday, June 06, 1999 7:18 PM
Subject: First run 6.5" coil- odd results? (fwd)
>Original Poster: Chip Atkinson <chip-at-pupman-dot-com>
>Date: Sun, 6 Jun 1999 11:58:19 EDT
>Subject: First run 6.5" coil- odd results?
> Since I'm new to the list, let me introduce myself. My name is Scott,
>or "Lugnut" and I am very new to coiling. I wanted a good start, so I made
>and bought everything for my coil, except for Xformer...:_( Chances are I
>doing something wrong but don't know it. I heard that my results were odd
>to my Xformer, tell me what you think.
> Well, here's my stuff: right now I'm getting 8" sparks maybe 9".
> secondary-6.5" OD PVC 1/4" thick wound to 26" 22 or 24 gauge...I
> primary- flat pancake, 1/4" copper tubing spaced 1/4"
> 13 turns total.
> capactitor- salt water type, 15 totally assorted bottles in a 10
> gallon fish tank-no oil and I'm not getting flashover. Probrobly due
> my transformer's lack of power.
> Xformer- right now I have a horrble, beat up, but working 4000 volt
> Spark gap- 4 gaps at about 1 millimeter each.
> There are no bypass caps or safety gaps.
> Discharg terminal- Use everything from a nail to a 7" sphere. After
> tuning, I get the best results from the sphere, about 8" sparks. I
> to use a nail to get sparks to the air, they get about 6" in the
>(really dim, but I can feel, them <ouch!>.
> Problem- I have no real idea if I am doing well or not because nobody
> that I've heard of uses the weak transformer that I have. If I buy
> 12kv-at-30mA NST's, will I get 12x the sparks? That almost sounds
> By the way, I'm 14 and showed my science teacher, she looked at it
> I was doing something wrong...hmmmmm...maybe I am. Please help me out
> or even comment on my coil. I even need a name of sorts...you people
>are the best!