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Re: What do you use for ballasting?



Original poster: "Steve & Jackie Young by way of Terry Fritz <twftesla-at-uswest-dot-net>" <youngs-at-konnections-dot-com>

Mike,

Well, if you want to be a pioneer and adventurous, try the following version
of "8) Other", which may not need any ballast at all!?

Since you have an SRSG, consider adding more stationary contacts so the SRSG
acts like a SPDT switch.  In position one, it will charge your tank cap
completely independent of the primary.  In the next position, the tank cap
discharges only into your primary.  And the cycle repeats, repeats, re...

In this arrangement, you never have the spark gap directly across your PT,
so no power arcs.  And the secondary tank circuit is entirely isolated from
the PT (position 2 bangs), so no RF protection circuits are needed.

I know this will work well with DC, and I am hoping you or someone will try
it with AC and a properly phased SPDT SRSG.  PT current will be proportional
to and limited by the break rate (and your voltage controller variac, of
course), so you may need little or no ballasting.  (If I am overlooking
something, someone please jump in and set us straight.)

--Steve


----- Original Message -----
From: Tesla list <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Monday, January 08, 2001 7:20 AM
Subject: What do you use for ballasting?


> Original poster: "Mike Waddick by way of Terry Fritz
<twftesla-at-uswest-dot-net>" <Mikew-at-winternet-dot-com>
>
> Hello all,
>
> I am now working on a Potential Transformer Powered Tesla coil. (2.5kva) I
> now need ballasting. I know of most all methods. I am not on much a budget
> and I would like some opinions. So my question to all of you is....
>
>
> What one do you use and what one is the best?
>
> 1)Resistive
> 2)Both Resistive and Inductive
> 3)arc welder
> 4)MOT's
> 5)Variac (non cut)
> 6)Variac (Cut)
> 7)home made Inductor (if so what type?)
> 8) other ______________
>
>
> My specs on my coil are......(what type of ballasting should I use?)
>
> Tranny: 16.5kv PT run at 2.5kva and rated at 1.5kva continuous, Runs on
120v
> ac
> Primary gap: SRSG (not much more to it)
> Primary cap: a .03mfd 35kv Maxwell pulse cap
> Primary: Has ~14 turns of .025" copper tubing with a spacing of .25", 8"
ID
> Secondary: A 6" X 30" wound with 22awg wire on a Acrylic form
> Topload: a 6" x 20" Al duct covered with Fiber glass and then coated with
AL
> tape
>
> For voltage controller I will be using a 50amp 120v in 0-140v out variac
>
>
> Thanks A lot for all of you that respond,
>
> Mike Waddick
>
> Http://www.winternet-dot-com/~mikry
>
>
>
>