Re: First coil

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Jake Draper by way of Terry Fritz <twftesla-at-qwest-dot-net>" <cybermecium2-at-home-dot-com>

Hi, I'm 13 years old and I just built my first coil recently. I am using a
15/60 NST with a 3.5" X 12" secondary hand wound with 27AWG. I can get 12-14"
sparks off the topload (which is made from an aluminum dryer duct) which look
very nice. My spark gap is 5 gaps made from 6 copper tubes. Anyways, the first
thing I would do for your coil is get it in tune and redo the primary. 3
primary turns isn't very much and it might be better if you added more (10 or
so) and played around with the different tap points to see where you can tune
it. Secondly, your topload should be bigger and with less rough edges, you can
get creative with this. Also, if you can, use two MOTS in series with a voltage
doubler to get 8-12KV at about 200-400mA of current which will GREATLY improve
your coil's performance. Good luck,
    Jake D.
    <mailto:cybermecium2-at-home-dot-com>cybermecium2-at-home-dot-com
    http://tasystems.cjb-dot-net
 
-------Original Message-------
 
From: <mailto:tesla-at-pupman-dot-com>Tesla list
Date: Friday, November 02, 2001 08:54:40 AM
To: <mailto:tesla-at-pupman-dot-com>tesla-at-pupman-dot-com
Subject: First coil
 
Original poster: "Joseph Geiss by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<joseph20-at-home-dot-com>

hello all,

about 1 year ago I decided to build a coil so I wound a secondary and then,
it happened, I got a girlfriend so all my money and time went to a different
cause. well tonight (Thursday) I decided to drag out the secondary I hand
wound (ugh! never again) to see if I could make a coil with it and what I
had laying around.

The secondary is 4" ID PVC and about 20" tall with 15.5" wound it has
775turns of 26awg wire on it.

The primary was a 3 turn hideously malformed flat spiral of 12awg house
wire. It is about 1/2" from the secondary and varies from 1" to 1/4" spacing
between turns.

The transformer is a single MOT

The spark gap is a (now don't laugh) 1600rpm AC cooling fan I got out of
some cooling unit, I broke 2 of the metal fan blades off and trimmed the
remaining 2 so its like a spinning metal ruler to make a sort of rotary gap,
one HV terminal of the MOT is connected to the motor shaft and the other is
connected to a flying lead that's close to the spinning blade and completes
the circuit about 80% of the time.

The cap is slightly LTR, a .86uf microwave oven cap

topload is a 4" ball of aluminum foil which could most likely be smashed to
a 1.5" - 2" ball

This is in my basement and without the secondary grounded, if I prop up a 4'
fluorescent tube on the near by table and bring one of the metal ends near
the topload I can get 1" sparks, the gap sounds to be around 200-300 breaks
per second but is probably lower than that because the flying lead shakes
and gets to far away from the fan blades.

not to bad for the crap I had laying around, any suggestions to get a little
more output?

pleased with my junk coil,
Joe Geiss in Maryland


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