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Re: More primary L needed

Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>

Hi Mike,

I took a look at your coil. Looks like a nice spun toroid on top (a little small but still nice). Ok, well, if more C is not an option, then my vote would be to wind a Dual-Layer Primary. This will keep the primary small and still have the ability to achieve the L needed.

Here's a little tool if you want to contemplate the thought.

Take care,

Tesla list wrote:

Original poster: "Mike Tucknott" <michael.tucknott@xxxxxxxxxx>

Hi All

I`v done the calc and I`v found that I need more primary to get the system to tune. OK so adding more primary C is not an option also there is no room to add an extra turn on to the primary, so I built a small inductor out of 14 turns of thick insulated copper wire about 3" dia in the centre is a soft iron core made up of ferrous rods.

This plus the primary coil give just over the required inductance.

What are peoples thoughts on this ? method and construction.

Cheers Mike

Smokin in south Oxfordshire UK