Re: [TCML] How do they ballast BIG coils?

["Bart B. Anderson" <bartb@xxxxxxxxxxxxxxxx>]

Stefan,

A slot in the core is cut creating an air gap. Pull the winding out, 
remove the front panel where there is only core and no windings. I used 
a gravity fed bandsaw for this and just let it cut through. Then epoxied 
some plastic strips in the gap. The gap itself was about 1/16" or 
whatever the bandsaw blade thickness was. Then assemble the core back to 
normal. The inductor is used then as a single slide choke, thus using 
just the tap lead and one end of the winding, connect it in series with 
the LV to the supply.

Take care,
Bart

On 9/13/2012 6:10 AM, Teslalabor wrote:
> How is it possible to limit current by the use of a variac? I mean, 
> there is no air gap in the core or such things. Tried it several times 
> in the past on my teslacoils to limit current with a normal variac and 
> I never hat success with that.
>
> Stefan

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