Re: Requesting help with construction of coil

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Dr. Resonance" <resonance@xxxxxxxxxx>


Your design indicates overcoupling.

With a 3 inch dia. sec. the first turn of the sec should be elevated above a
completely flat pri coil by 1/2 inch for best coupling coefficient.

Keep the innermost turn of pri at least 1.25 inches away from the sec.

If the sec has been arcing, it's probably damaged and needs to be rewound.
Those powerful capacitive type sparks along a sec will puncture the
insulation right down to the bare wire.  Now, you have a hole that resemble
the grand canyon to electrons.

In your new sec, install a circular 1/4 inch thick acrylic disks approx 4
inches down from the top end and 3 inches up from the bottom end.  Use GE
Silicone II (hardware store) to hold in place and allow to dry overnight
prior to replacing the coils endplates.

Matt E.


Resonance Research Corporation
E11870 Shadylane Rd.
Baraboo   WI   53913
----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Thursday, December 23, 2004 11:24 AM
Subject: Requesting help with construction of coil


> Original poster: "Christopher" <cpfortun@xxxxxxxxxx>
>
> Hi,
>
> I'm writing in regards to a new coil I recently constructed. The specs are
> as follows : 9kv franceformer....180mA, SRSG, a total of 24 caps.....8
> seriesed 3 legs paralled.. (.15MFD at 2000V each) making for a total of
> .058MFD, the primary coil consists of 11 turns......the first four turns
> are vertical and the other seven are horizontal.....I am using 1/4" soft
> copper tubing "OD" and the spacing between the turns is 1/4", the
secondary
> is 3" "OD" with a total height of 24 1/2" with the magnet wire wrap length
> meausuring 22 3/4"........on top of the secondary is a spacer which holds
> the toroid a total of 3 1/2" above the secondary, the toroid measures 19
> 1/2" by 4". The electrical connections are as follows : xfmr is in
parallel
> with the caps, on end of the caps is connected straight into the primary
> coil, the other end of the caps is connected to the spark gap (one side of
> the spark gap), the other side of the spark gap is used for the tapping
> point of the primary coil, (The safety gap, secondary coil, and strike
rail
> are connected together as one source going to RF ground). If there may be
> any questions that need further explaination in regards to the mechanical
> or electrical setup let me know.
> Moving on to my troubles.......when I initially constructed my coil I
> allowed for a 5" inside diameter between my secondary and
> primary........which left a total of 1" spacing between these two. This
> wasn't enough because I was getting sparks from my primary to my secondary
> on the vertical turns. So I redid my primary and made for a 6" inside
> diameter needless to say this fixed the problem and decreased the tapping
> point. The problem now is that my streamers are extremely short, maybe 10
> inches, and I am getting sparks that start about the middle of my
secondary
> which strike down to my primary. The tapping point has no effect on the
> size of the streamers no matter where I tap it, they are the same l ength.
> I tried raising the secondary gradually but has no effect on eliminating
> the sparks from the secondary to the primary.....I either get sparks or
> nothing at all. The spark gap is set up as 4 stationary electrodes and 1
> rotating electrode. I am also using a variac with this system. After the
> spark gap has been turned on and operated up to full speed, I slowly turn
> up the variac from 0 V to 120 V, this is the reaction of the spark
> gap....all four will fire, then two will fire and them the other two will
> fire almost instantaneously, then only two of the electrodes will fire
> until I reach 80 volts and then all four will kick in again and stay on up
> to 120 volts. Does this sound pretty normal for the operation of it ?
> Anyhow that's enough for now.
> Any feedback in regards to the sparks from the secondary to the primary
and
> just the overall setup and operation of this unit will be greatly
> appreciated :)
> Thanks,
> Chris F.
> <mailto:cpfortun@xxxxxxxxxx>cpfortu n@xxxxxxxxxx
>
>
>
>
>