Re: primary and secondary diameters

• To: "'Tesla List'" <tesla-at-poodle.pupman-dot-com>
• Subject: Re: primary and secondary diameters
• From: Tesla List <tesla-at-stic-dot-net>
• Date: Wed, 26 Nov 1997 23:30:22 -0600
• Approved: tesla-at-stic-dot-net

From: 	Malcolm Watts[SMTP:MALCOLM-at-directorate.wnp.ac.nz]
Sent: 	Wednesday, November 26, 1997 11:07 PM
To: 	Tesla List
Subject: 	Re: primary and secondary diameters

Hi Christopher,

> From:   Christopher Stone[SMTP:stone-at-etak-dot-com]
> Sent:   Tuesday, November 25, 1997 6:45 AM
> To:     tesla-at-pupman-dot-com
> Subject:    primary and secondary diameters
> 
> Hi all,
> 
> I am working on building my first coil and I have found information 
> that has stated that the primary should be twice the diameter of the 
> secondary and others state 3 times the diameter.  Which works best? 
> I was planning on using heavy guage wire #8 or so, how much difference 
> does it make between air wound and bundled?  

You get a lot more inductance for the same length of copper in a 
bundled winding but the insulation requirements are a lot more 
problematic too. I've found that a good compromise is a two-layer 
flat spiral with an acrylic sheet between layers.

Malcolm

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